/* ============================================================
   THE SIGNAL — A Spatial Codex
   Apple-Inspired Design System
   ============================================================ */

:root {
  --color-off-white:      #F5F5F7;
  --color-bg:             #F5F5F7;
  --color-card:           #FFFFFF;
  --color-card-hover:     #F8F8FA;
  --color-black:          #000000;
  --color-orange:         #FF5733;
  --color-orange-dim:     rgba(255, 87, 51, 0.50);
  --color-glass-bg:       rgba(255, 255, 255, 0.80);
  --color-glass-hero:     rgba(255, 255, 255, 0.10);
  --color-border:         rgba(0, 0, 0, 0.12);
  --color-border-light:   rgba(255, 255, 255, 0.22);
  --color-text:           #1D1D1F;
  --color-text-2:         #6E6E73;
  --color-text-3:         #AEAEB2;
  --color-text-inv:       #F5F5F7;
  --color-text-inv-2:     rgba(245, 245, 247, 0.65);
  --color-fill:           rgba(0, 0, 0, 0.04);
  --color-fill-2:         rgba(0, 0, 0, 0.07);
  --color-error:          #FF3B30;

  --color-signal:         #FF5733;
  --color-orange-t1:      #FFDDD5;   /* strongest orange tint */
  --color-orange-t2:      #FFE3DD;   /* medium orange tint */
  --color-orange-t3:      #FFE8E3;   /* light orange tint */
  --color-orange-t4:      #FFDAD1;   /* warm orange tint */
  --color-orange-t5:      #FFC9BB;   /* hover orange tint */
  /* Blueprint color system (Archipedia) */
  --color-blueprint:      #1D4ED8;
  --color-blueprint-t1:   #DBEAFE;
  --color-blueprint-t2:   #E0E7FF;
  --color-blueprint-t3:   #EEF2FF;
  --color-blueprint-t5:   #BFDBFE;
  --color-artifact-bg:    #F0F0F0;
  --color-artifact-border: #000000;
  --font: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-display: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-mono: 'Courier New', Courier, monospace;

  --r-xs:  6px;
  --r-sm:  10px;
  --r-md:  16px;
  --r-lg:  20px;
  --r-xl:  28px;
  --r-2xl: 40px;

  --shadow-sm:  0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md:  0 4px 16px rgba(0,0,0,0.10), 0 2px 6px rgba(0,0,0,0.06);
  --shadow-lg:  0 20px 60px rgba(0,0,0,0.15), 0 8px 24px rgba(0,0,0,0.08);
  --shadow-xl:  0 40px 80px rgba(0,0,0,0.20), 0 16px 40px rgba(0,0,0,0.10);

  --ease:  cubic-bezier(0.25, 0.1, 0.25, 1);
  --spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --t-fast:  180ms var(--ease);
  --t-base:  320ms var(--ease);
  --t-slow:  500ms var(--ease);
}

/* ── Dark Mode ─────────────────────────────────────────────── */
[data-theme="dark"] {
  --color-off-white:    #0A0A0D;
  --color-bg:           #0A0A0D;
  --color-card:         #1A1A1E;
  --color-card-hover:   #222226;
  --color-artifact-bg:    #1A1A1A;
  --color-artifact-border: #FFFFFF;
  --color-orange-t1:      rgba(255, 87, 51, 0.15);
  --color-orange-t2:      rgba(255, 87, 51, 0.12);
  --color-orange-t3:      rgba(255, 87, 51, 0.08);
  --color-orange-t4:      rgba(255, 87, 51, 0.15);
  --color-orange-t5:      rgba(255, 87, 51, 0.22);
  --color-border:       rgba(255,255,255,0.12);
  --color-border-light: rgba(255,255,255,0.14);
  --color-text:         #F5F5F7;
  --color-text-2:       #B8B8C0;
  --color-text-3:       #8E8E96;
  --color-text-inv:     #1D1D1F;
  --color-fill:         rgba(255,255,255,0.04);
  --color-fill-2:       rgba(255,255,255,0.07);
  --color-glass-bg:     rgba(10,10,13,0.82);
  /* Blueprint dark mode */
  --color-blueprint:      #3B82F6;
  --color-blueprint-t1:   rgba(59, 130, 246, 0.15);
  --color-blueprint-t2:   rgba(59, 130, 246, 0.10);
  --color-blueprint-t3:   rgba(59, 130, 246, 0.06);
  --color-blueprint-t5:   rgba(59, 130, 246, 0.22);
  --shadow-sm:          0 1px 3px rgba(0,0,0,0.30), 0 1px 2px rgba(0,0,0,0.20);
  --shadow-md:          0 4px 16px rgba(0,0,0,0.40), 0 2px 6px rgba(0,0,0,0.25);
  --shadow-lg:          0 20px 60px rgba(0,0,0,0.55), 0 8px 24px rgba(0,0,0,0.35);
}

[data-theme="dark"] .dashboard-header,
[data-theme="dark"] .chapter-header,
[data-theme="dark"] .archipedia-header {
  background: rgba(10,10,13,0.98);
}

/* Virgil Abloh — all tiles uniform, no special dark/epilog variants */

/* ── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  height: 100%;
}

body {
  font-family: var(--font);
  background: var(--color-black);
  color: var(--color-text);
  /* Safari-safe scroll pattern: body is the fixed viewport,
     sections use position:absolute inside it to scroll reliably */
  position: fixed;
  inset: 0;
  overflow: hidden;
}

/* ── Shared Section Behavior ────────────────────────────────── */
#hero-section,
#dashboard-section,
#chapter-section,
#archipedia-section {
  position: absolute;
  inset: 0;
  opacity: 0;
  pointer-events: none;
  visibility: hidden;                                   /* don't paint inactive sections */
  transition: opacity var(--t-base),
              visibility 0s linear var(--t-base);      /* hide AFTER fade-out completes */
}

#hero-section.active,
#dashboard-section.active,
#chapter-section.active,
#archipedia-section.active {
  opacity: 1;
  pointer-events: all;
  visibility: visible;
  transition: opacity var(--t-base),
              visibility 0s linear 0s;                 /* show IMMEDIATELY on activate */
}

/* iOS Safari: override auto-detected phone/date/address links (blue color) */
a[x-apple-data-detectors] {
  color: inherit !important;
  text-decoration: none !important;
  font-size: inherit !important;
  font-weight: inherit !important;
}

/* ============================================================
   STATE 1 — PORTAL (Virgil × Apple)
   ============================================================ */
#hero-section {
  background: #0A0A0A;
  display: flex;
  align-items: center;
  justify-content: center;
}

#rain-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 1;
  pointer-events: none;
}

/* ── Portal Header ─────────────────────────────────────────── */
.portal-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 40px;
}

.portal-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.portal-logo-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-signal);
  animation: signal-broadcast 2.6s ease-out infinite;
}

.portal-logo-text {
  font-family: 'Clash Display', 'Helvetica Neue', sans-serif;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.7);
}

.portal-lang {
  display: flex;
  gap: 2px;
  background: rgba(255,255,255,0.06);
  border-radius: 16px;
  padding: 2px;
}

.portal-lang-btn {
  position: relative;
  font-family: var(--font);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 14px;
  border: none;
  background: transparent;
  color: rgba(255,255,255,0.35);
  cursor: pointer;
  transition: all 0.2s ease;
}

.portal-lang-btn.active {
  background: rgba(255,255,255,0.12);
  color: #fff;
}

.portal-lang-btn:hover:not(.active) {
  color: rgba(255,255,255,0.6);
}

/* ── Portal Center UI ──────────────────────────────────────── */
.portal-ui {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 40px 24px;
}

.portal-title {
  font-family: 'Clash Display', 'Helvetica Neue', sans-serif;
  font-size: clamp(56px, 10vw, 120px);
  font-weight: 700;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: #fff;
  line-height: 1;
  margin-bottom: 20px;
}

.portal-label {
  font-family: var(--font);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-signal);
}

.portal-divider {
  width: 40px;
  height: 3px;
  background: var(--color-signal);
  margin: 24px auto;
}

/* ── Portal Input ──────────────────────────────────────────── */
.portal-input-wrap {
  position: relative;
  width: 320px;
  max-width: 100%;
  margin-bottom: 8px;
}

.portal-input {
  width: 100%;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  color: #fff;
  letter-spacing: 0.20em;
  text-align: center;
  padding: 14px 48px 14px 16px;
  border-radius: 12px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  outline: none;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
  -webkit-appearance: none;
}

.portal-input::placeholder {
  color: rgba(255,255,255,0.25);
  letter-spacing: 0.20em;
  font-weight: 500;
}

.portal-input:focus {
  border-color: rgba(255,87,51,0.5);
  box-shadow: 0 0 0 3px rgba(255,87,51,0.12);
}

.portal-input.error {
  border-color: var(--color-error);
  animation: hero-shake 0.38s var(--ease);
}

.portal-eye {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  color: rgba(255,255,255,0.3);
  display: flex;
  align-items: center;
  padding: 4px;
  transition: color var(--t-fast);
}
.portal-eye:hover { color: rgba(255,255,255,0.7); }
.portal-eye svg { width: 16px; height: 16px; }

/* ── Portal Error ──────────────────────────────────────────── */
.portal-error {
  font-family: var(--font);
  font-size: 12px;
  color: var(--color-error);
  min-height: 18px;
  opacity: 0;
  transition: opacity var(--t-fast);
  margin-bottom: 16px;
}
.portal-error.visible { opacity: 1; }

/* ── Portal Button ─────────────────────────────────────────── */
.portal-btn {
  width: 320px;
  max-width: 100%;
  background: var(--color-signal);
  color: #fff;
  border: none;
  padding: 14px 48px;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  cursor: pointer;
  border-radius: 12px;
  transition: all var(--t-fast);
  margin-bottom: 40px;
}

.portal-btn:hover {
  filter: brightness(1.1);
  box-shadow: 0 4px 24px rgba(255,87,51,0.35);
}

.portal-btn:active { transform: scale(0.98); }

.portal-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ── Portal Footer ─────────────────────────────────────────── */
.portal-footer {
  font-family: var(--font);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.2);
}

@keyframes hero-shake {
  0%,100% { transform: translateX(0); }
  20%,60%  { transform: translateX(-6px); }
  40%,80%  { transform: translateX(6px); }
}

@media (max-width: 640px) {
  .portal-header { padding: 16px 20px; }
  .portal-input-wrap, .portal-btn { width: 280px; }
  #rain-canvas { opacity: 1; }
}

/* ============================================================
   STATE 3 — DASHBOARD
   ============================================================ */
#dashboard-section {
  z-index: 5;
  background: var(--color-off-white);
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 19px, rgba(0,0,0,0.04) 19px, rgba(0,0,0,0.04) 20px),
    repeating-linear-gradient(90deg, transparent, transparent 19px, rgba(0,0,0,0.04) 19px, rgba(0,0,0,0.04) 20px);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  touch-action: pan-y;
}

[data-theme="dark"] #dashboard-section {
  background: #0A0A0D;
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 19px, rgba(255,255,255,0.06) 19px, rgba(255,255,255,0.06) 20px),
    repeating-linear-gradient(90deg, transparent, transparent 19px, rgba(255,255,255,0.06) 19px, rgba(255,255,255,0.06) 20px);
}

.dashboard-header {
  padding: 24px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: rgba(245, 245, 247, 0.88);
  backdrop-filter: blur(24px) saturate(1.8);

  z-index: 10;
}

.dashboard-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text);
}

.dashboard-logo-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-orange);
  flex-shrink: 0;
  animation: signal-broadcast 2.6s ease-out infinite;
}

.dashboard-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.10em;
  color: var(--color-text-2);
}

.btn-logout {
  background: var(--color-fill-2);
  border: none;
  border-radius: var(--r-2xl);
  padding: 7px 16px;
  font-family: var(--font);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-text-2);
  cursor: pointer;
  transition: all var(--t-fast);
}
.btn-logout:hover {
  background: rgba(0,0,0,0.12);
  color: var(--color-text);
}

.dashboard-main {
  padding: 44px 40px 80px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.dashboard-intro {
  position: relative;
}

/* Archipedia badge — pure text link, right-aligned in intro row */
.dashboard-archipedia {
  position: absolute;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  cursor: pointer;
}
.dashboard-archipedia-title {
  font-family: 'Clash Display', 'Helvetica Neue', sans-serif;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #1D4ED8;
  transition: color 0.2s ease;
}
.dashboard-archipedia-title span {
  display: inline-block;
  transition: transform 0.2s ease;
}
.dashboard-archipedia:hover .dashboard-archipedia-title {
  color: #3B82F6;
}
.dashboard-archipedia:hover .dashboard-archipedia-title span {
  transform: translateX(4px);
}
.dashboard-archipedia-meta {
  font-family: var(--font);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-2);
  margin-top: 4px;
}

.dashboard-intro-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-orange);
  margin-bottom: 10px;
}

.dashboard-intro-title {
  font-family: 'Clash Display', 'Helvetica Neue', sans-serif;
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.10;
  color: var(--color-text);
  text-transform: uppercase;
}

.dashboard-intro-sub {
  font-size: 15px;
  color: var(--color-text-2);
  line-height: 1.55;
  margin-top: 8px;
  font-weight: 450;
}

/* ── Chapter Grid ─────────────────────────────────────────── */
.chapters-grid {
  display: grid;
  grid-template-columns: repeat(15, 1fr);
  gap: 14px;
}

/* ── Tile — Virgil × Apple Hybrid ────────────────────────── */
.chapter-tile {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(0, 0, 0, 0.18);
  border-radius: 16px;
  border-bottom: 3px solid rgba(0, 0, 0, 0.15);
  padding: 28px 24px 24px;
  cursor: pointer;
  transition: none;
  display: flex;
  flex-direction: column;
  min-height: 210px;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(6px);

}

/* Dark Mode — glass on dark grid */
[data-theme="dark"] .chapter-tile {
  background: rgba(26, 26, 26, 0.92);
  border-color: rgba(255, 255, 255, 0.12);
  border-bottom-color: rgba(255, 255, 255, 0.15);
  box-shadow: 0 4px 12px -2px rgba(255, 255, 255, 0.06);
}

/* Hover: diagonal warning stripe overlay — "Der Drop" */
.chapter-tile::before {
  content: '\2192  ENTER';
  position: absolute;
  inset: 0;
  border-radius: 16px;
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
  padding: 10px 14px;
  font-family: var(--font);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: #000;
  background: repeating-linear-gradient(
    -45deg,
    var(--color-signal) 0,
    var(--color-signal) 8px,
    #000 8px,
    #000 16px
  );
  opacity: 0;
  pointer-events: none;
  z-index: 2;
  transition: opacity 0.08s linear;
}

.chapter-tile:hover::before { opacity: 0.35; }

/* Hover: title inversion */
.chapter-tile:hover .tile-title,
.chapter-tile:hover .tile-meta,
.chapter-tile:hover .tile-desc {
  color: #FFFFFF;
  text-shadow: 0 1px 4px rgba(0,0,0,0.6);
  position: relative;
  z-index: 3;
}

[data-theme="dark"] .chapter-tile:hover .tile-title,
[data-theme="dark"] .chapter-tile:hover .tile-desc {
  color: #FFFFFF;
  text-shadow: 0 1px 4px rgba(0,0,0,0.6);
}

.chapter-tile:active { transform: none; }

/* Touch: no hover overlay — tap opens directly */
@media (hover: none) {
  .chapter-tile::before { display: none; }
}

/* ACTIVE state — visited chapters (archive stamp) */
.chapter-tile.tile-active {
  background: rgba(255, 255, 255, 0.95);
  border-left: 8px solid var(--color-signal);
  border-bottom: 3px solid var(--color-signal);
}

[data-theme="dark"] .chapter-tile.tile-active {
  background: rgba(26, 26, 26, 0.95);
  box-shadow: 0 4px 12px -2px rgba(255, 87, 51, 0.25);
}


.tile-header {
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
}

/* Decorative large chapter number — replaces small tile-num */
.tile-num-bg {
  position: absolute;
  top: 20px;
  left: 24px;
  font-family: 'Clash Display', 'Helvetica Neue', sans-serif;
  font-size: 48px;
  font-weight: 900;
  color: var(--color-text);
  opacity: 0.18;
  pointer-events: none;
  z-index: 0;
  line-height: 1;
  letter-spacing: -0.02em;
  user-select: none;
}
[data-theme="dark"] .tile-num-bg {
  opacity: 0.22;
}

.tile-meta {
  font-family: var(--font);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-2);
}

.tile-body {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: auto;
}

/* Status toggle — small dot bottom-right, large hit area */
.tile-status-btn {
  position: absolute;
  bottom: 2px;
  right: 2px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 0;
  z-index: 4;
  opacity: 1;
  transition: opacity 0.15s ease;
}
.tile-status-btn::after {
  content: '';
  position: absolute;
  bottom: 8px;
  right: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1.5px solid rgba(0, 0, 0, 0.15);
  background: transparent;
  opacity: 0.35;
  transition: opacity 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.tile-status-btn:hover::after {
  opacity: 0.7;
}
.tile-status-btn.active::after {
  background: var(--color-signal);
  border-color: var(--color-signal);
  opacity: 0.5;
}
.tile-status-btn.active:hover::after {
  opacity: 0.8;
}
[data-theme="dark"] .tile-status-btn::after {
  border-color: rgba(255, 255, 255, 0.2);
}

.tile-title {
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 17px;
  font-weight: 900;
  letter-spacing: 0.06em;
  color: var(--color-text);
  line-height: 1.25;
  text-transform: uppercase;
  position: relative;
  z-index: 1;
}

.tile-desc {
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-2);
  line-height: 1.5;
  letter-spacing: 0.02em;
  position: relative;
  z-index: 1;
}

/* ============================================================
   STATE 4 — CHAPTER VIEW
   ============================================================ */
#chapter-section {
  z-index: 5;
  background: var(--color-off-white);
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 19px, rgba(0,0,0,0.04) 19px, rgba(0,0,0,0.04) 20px),
    repeating-linear-gradient(90deg, transparent, transparent 19px, rgba(0,0,0,0.04) 19px, rgba(0,0,0,0.04) 20px);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  touch-action: pan-y;
}

[data-theme="dark"] #chapter-section {
  background: #0A0A0D;
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 19px, rgba(255,255,255,0.06) 19px, rgba(255,255,255,0.06) 20px),
    repeating-linear-gradient(90deg, transparent, transparent 19px, rgba(255,255,255,0.06) 19px, rgba(255,255,255,0.06) 20px);
}

.chapter-header {
  padding: 20px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: rgba(245, 245, 247, 0.98);
  /* backdrop-filter removed: caused Safari scroll hang in
     sticky-child inside fixed+overflow:scroll ancestors */
  z-index: 10;
}

.btn-back {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--color-fill-2);
  border: none;
  border-radius: 100px;
  cursor: pointer;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text);
  padding: 7px 16px 7px 12px;
  transition: all var(--t-fast);
}

.btn-back:hover {
  background: rgba(0,0,0,0.10);
  transform: translateX(-2px);
}

.btn-back svg {
  width: 14px;
  height: 14px;
  transition: transform var(--t-fast);
}

.chapter-header-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.chapter-num-badge {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--color-text-2);
  font-variant-numeric: tabular-nums;
}

.chapter-nav-btn {
  background: var(--color-fill-2);
  border: none;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--color-text-2);
  transition: all var(--t-fast);
}
.chapter-nav-btn:hover:not(:disabled) {
  background: rgba(0,0,0,0.10);
  color: var(--color-text);
  transform: scale(1.1);
}
.chapter-nav-btn:disabled { opacity: 0.3; cursor: not-allowed; }
.chapter-nav-btn svg { width: 14px; height: 14px; }

/* ── Chapter Body ─────────────────────────────────────────── */
.chapter-body {
  max-width: 720px;
  margin: 0 auto;
  padding: 56px 40px 100px;
  width: 100%;
}

.chapter-eyebrow {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-orange);
  margin-bottom: 14px;
}

.chapter-main-title {
  font-size: clamp(30px, 4.5vw, 52px);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.04;
  color: var(--color-text);
  text-transform: uppercase;
  margin-bottom: 14px;
}

.chapter-subtitle {
  font-size: 17px;
  color: var(--color-text-2);
  line-height: 1.65;
  font-weight: 450;
  margin-bottom: 48px;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--color-border);
  letter-spacing: 0.01em;
}

.chapter-content {
  display: flex;
  flex-direction: column;
  gap: 42px;
}

/* Image */
.chapter-image {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  border-radius: var(--r-xl);
  display: block;
  box-shadow: var(--shadow-md);
}

.chapter-image-caption {
  font-size: 12px;
  color: var(--color-text-2);
  margin-top: 10px;
  text-align: right;
  letter-spacing: 0.04em;
}

/* Content block */
.content-block {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.content-block h3 {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-orange);
  margin-bottom: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.content-block h3::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-orange);
  flex-shrink: 0;
}

.content-block p {
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--color-text);
  font-weight: 450;
  letter-spacing: 0.01em;
}

.content-block p strong {
  font-weight: 600;
  color: var(--color-text);
}

/* Pull quote */
.pull-quote {
  background: var(--color-orange-t1);
  border-radius: var(--r-lg);
  padding: 28px 32px;
  border-left: 3px solid var(--color-orange);
}

.pull-quote p {
  font-size: 18px;
  font-style: italic;
  line-height: 1.70;
  color: var(--color-text);
  font-weight: 450;
  letter-spacing: 0.01em;
}

/* References */
.chapter-references {
  margin-top: 8px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.chapter-references h3 {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-text-2);
  margin-bottom: 14px;
}

.chapter-references li {
  list-style: none;
  font-size: 13px;
  color: var(--color-text-2);
  line-height: 1.5;
  padding-left: 16px;
  position: relative;
  margin-bottom: 6px;
}

.chapter-references li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--color-orange);
}

/* ============================================================
   TOOLKIT — Kapitel 7
   ============================================================ */
.toolkit-intro {
  font-size: 15px;
  color: var(--color-text-2);
  line-height: 1.65;
  margin-bottom: 4px;
}

.toolkit-matrix {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.toolkit-category {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--r-xl);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(16px);

}

.toolkit-cat-header {
  display: flex;
  align-items: center;
  gap: 10px;
}

.toolkit-cat-icon {
  width: 28px;
  height: 28px;
  border-radius: var(--r-sm);
  background: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.toolkit-cat-icon svg {
  width: 13px;
  height: 13px;
  color: var(--color-orange);
}

.toolkit-cat-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text);
}

.toolkit-cat-sub {
  font-size: 11px;
  color: var(--color-text-2);
  margin-top: 1px;
}

.toolkit-items { display: flex; flex-direction: column; gap: 5px; }

.toolkit-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  background: var(--color-fill);
  border: 1px solid transparent;
  border-radius: var(--r-md);
  cursor: pointer;
  transition: all var(--t-fast);
  gap: 8px;
  text-align: left;
}

.toolkit-item:hover {
  background: var(--color-bg);
  border-color: var(--color-border);
  box-shadow: var(--shadow-sm);
  transform: translateX(2px);
}

.toolkit-item.copied {
  border-color: var(--color-orange);
  background: var(--color-orange-t2);
}

.toolkit-item-body {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
  text-align: left;
}

.toolkit-item-text {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.3;
}

.toolkit-item-effect {
  font-size: 10px;
  color: var(--color-text-2);
  line-height: 1.3;
  font-weight: 500;
}

.toolkit-item-copy {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: var(--r-xs);
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--t-fast);
}

.toolkit-item:hover .toolkit-item-copy { background: var(--color-orange); }
.toolkit-item.copied .toolkit-item-copy { background: var(--color-orange); }

.toolkit-item-copy svg { width: 11px; height: 11px; color: var(--color-text-2); }
.toolkit-item:hover .toolkit-item-copy svg,
.toolkit-item.copied .toolkit-item-copy svg { color: #fff; }

/* ── Copy Toast ───────────────────────────────────────────── */
.copy-toast {
  position: fixed;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%) translateY(12px);
  background: rgba(28,28,30,0.92);
  color: var(--color-text-inv);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  padding: 12px 22px;
  border-radius: 100px;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: all var(--t-base);
  display: flex;
  align-items: center;
  gap: 8px;
  backdrop-filter: blur(20px);

  box-shadow: var(--shadow-lg);
}

.copy-toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.copy-toast-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-orange);
  flex-shrink: 0;
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes signal-broadcast {
  0%   { box-shadow: 0 0 0 0 rgba(255, 87, 51, 0.70); }
  60%  { box-shadow: 0 0 0 11px rgba(255, 87, 51, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 87, 51, 0); }
}

@keyframes fade-up {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.animate-fade-up {
  animation: fade-up 0.45s var(--ease) forwards;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .chapters-grid     { grid-template-columns: repeat(2, 1fr); }
  .chapters-grid .chapter-tile { grid-column: span 1 !important; }
  .toolkit-matrix    { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .hero-corner       { display: none; }
  .hero-content      { padding: 24px; gap: 20px; }

  .dashboard-header  { padding: 18px 20px; }
  .dashboard-main    { padding: 28px 20px 60px; gap: 28px; }
  .chapters-grid     { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .chapter-tile      { padding: 20px 16px; min-height: 170px; }

  .chapter-header    { padding: 16px 20px; }
  .chapter-body      { padding: 36px 20px 60px; }
  .chapter-main-title { font-size: 28px; }
  .toolkit-matrix    { grid-template-columns: 1fr; }

  .modal-card        { padding: 40px 28px; }
}

/* ── Theme Toggle ────────────────────────────────────────── */
.theme-toggle {
  background: rgba(28,28,30,0.88);
  border: none;
  border-radius: 100px;
  padding: 7px 12px;
  cursor: pointer;
  font-size: 13px;
  line-height: 1;
  transition: opacity 180ms ease;
  -webkit-tap-highlight-color: transparent;
}
.theme-toggle:hover { opacity: 0.75; }

/* ── Language Switcher ───────────────────────────────────── */
.lang-switcher {
  display: flex;
  background: rgba(28, 28, 30, 0.88);
  border-radius: 100px;
  padding: 3px;
  gap: 2px;
}

.lang-btn {
  background: transparent;
  border: none;
  border-radius: 100px;
  padding: 8px 16px;
  font-family: var(--font);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.45);
  cursor: pointer;
  transition: all var(--t-fast);
}

.lang-btn:hover:not(.active) {
  color: rgba(255, 255, 255, 0.75);
}

.lang-btn.active {
  background: var(--color-off-white);
  color: var(--color-text);
  box-shadow: 0 1px 4px rgba(0,0,0,0.20);
}

/* lang-switcher mobile position handled in the mobile block below */

/* ── Scrollbar ───────────────────────────────────────────── */
#dashboard-section::-webkit-scrollbar,
#chapter-section::-webkit-scrollbar,
#archipedia-section::-webkit-scrollbar { width: 5px; }
#dashboard-section::-webkit-scrollbar-track,
#chapter-section::-webkit-scrollbar-track,
#archipedia-section::-webkit-scrollbar-track  { background: transparent; }
#dashboard-section::-webkit-scrollbar-thumb,
#chapter-section::-webkit-scrollbar-thumb,
#archipedia-section::-webkit-scrollbar-thumb  {
  background: rgba(0,0,0,0.12);
  border-radius: 10px;
}

/* ============================================================
   STATE 5 — ARCHIPEDIA TIMELINE
   ============================================================ */
#archipedia-section {
  z-index: 5;
  background: #F0F4FF;
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 19px, rgba(29,78,216,0.06) 19px, rgba(29,78,216,0.06) 20px),
    repeating-linear-gradient(90deg, transparent, transparent 19px, rgba(29,78,216,0.06) 19px, rgba(29,78,216,0.06) 20px);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  touch-action: pan-y;
}
[data-theme="dark"] #archipedia-section {
  background: #0C1929;
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 19px, rgba(59,130,246,0.10) 19px, rgba(59,130,246,0.10) 20px),
    repeating-linear-gradient(90deg, transparent, transparent 19px, rgba(59,130,246,0.10) 19px, rgba(59,130,246,0.10) 20px);
}

.archipedia-header {
  padding: 20px 40px;
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid rgba(29,78,216,0.15);
  position: sticky; top: 0; z-index: 20;
  background: rgba(240,244,255,0.90);
  backdrop-filter: blur(24px) saturate(1.8);
}
[data-theme="dark"] .archipedia-header {
  background: rgba(12,25,41,0.90);
  border-bottom-color: rgba(59,130,246,0.18);
}
.archipedia-header-center { position: absolute; left: 50%; transform: translateX(-50%); }
.archipedia-brand { font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--color-text-2); font-weight: 500; }
.archipedia-brand strong { font-weight: 700; color: var(--color-text); }
.archipedia-header-right { min-width: 80px; text-align: right; }
.archipedia-count { font-size: 11px; color: var(--color-text-3); letter-spacing: 0.08em; font-weight: 500; }

/* ── Sticky Controls Bar ─────────────────────────────────── */
.tl-controls {
  position: sticky; top: 60px; z-index: 15;
  background: rgba(240,244,255,0.92);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(29,78,216,0.10);
  padding: 16px 40px;
  display: flex; align-items: center; gap: 20px;
  flex-wrap: wrap;
}
[data-theme="dark"] .tl-controls {
  background: rgba(12,25,41,0.92);
  border-bottom-color: rgba(59,130,246,0.12);
}

/* Main Filter Toggles */
.tl-main-filters { display: flex; gap: 8px; }
.tl-toggle {
  font-family: 'Clash Display', 'Helvetica Neue', sans-serif;
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase;
  padding: 8px 20px; border-radius: 100px;
  border: 1.5px solid rgba(29,78,216,0.25);
  background: transparent; color: var(--color-text-2);
  cursor: pointer; transition: all 0.2s ease;
}
.tl-toggle.active {
  background: var(--color-blueprint);
  border-color: var(--color-blueprint);
  color: #fff;
  box-shadow: 0 2px 12px rgba(29,78,216,0.30);
}
.tl-toggle:not(.active):hover {
  border-color: rgba(29,78,216,0.5);
  color: var(--color-text);
}
[data-theme="dark"] .tl-toggle {
  border-color: rgba(59,130,246,0.25);
}
[data-theme="dark"] .tl-toggle.active {
  background: #3B82F6;
  border-color: #3B82F6;
  box-shadow: 0 2px 12px rgba(59,130,246,0.35);
}

/* Search */
.tl-search-wrap { position: relative; flex: 1; max-width: 320px; min-width: 180px; }
.tl-search-icon { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); width: 15px; height: 15px; color: var(--color-text-3); pointer-events: none; }
.tl-search {
  width: 100%; padding: 10px 16px 10px 38px;
  background: rgba(255,255,255,0.7); border: 1px solid rgba(29,78,216,0.15);
  border-radius: 100px; font-family: var(--font); font-size: 13px;
  color: var(--color-text); outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.tl-search::placeholder { color: var(--color-text-3); }
.tl-search:focus { border-color: var(--color-blueprint); box-shadow: 0 0 0 3px rgba(29,78,216,0.08); }
[data-theme="dark"] .tl-search { background: rgba(18,34,64,0.7); border-color: rgba(59,130,246,0.18); color: #E2E8F0; }
[data-theme="dark"] .tl-search:focus { border-color: #3B82F6; box-shadow: 0 0 0 3px rgba(59,130,246,0.12); }

/* Epoch Navigation */
.tl-epoch-nav { display: flex; gap: 6px; flex-wrap: wrap; margin-left: auto; }
.tl-epoch-dot {
  width: 28px; height: 28px; border-radius: 50%;
  border: 1.5px solid rgba(29,78,216,0.20);
  background: transparent; color: var(--color-text-3);
  font-size: 8px; font-weight: 700; font-family: 'Courier New', monospace;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: all 0.2s;
}
.tl-epoch-dot:hover, .tl-epoch-dot.active {
  background: var(--color-blueprint); border-color: var(--color-blueprint);
  color: #fff; box-shadow: 0 2px 8px rgba(29,78,216,0.25);
}
[data-theme="dark"] .tl-epoch-dot { border-color: rgba(59,130,246,0.25); }
[data-theme="dark"] .tl-epoch-dot:hover, [data-theme="dark"] .tl-epoch-dot.active {
  background: #3B82F6; border-color: #3B82F6;
}

/* ── Timeline Container ──────────────────────────────────── */
.tl-container {
  max-width: 960px; margin: 0 auto;
  padding: 40px 40px 120px;
  position: relative;
}

/* Central Line */
.tl-container::before {
  content: ''; position: absolute;
  left: 50%; top: 0; bottom: 0; width: 2px;
  background: linear-gradient(to bottom, transparent 0%, var(--color-blueprint) 60px, var(--color-blueprint) calc(100% - 60px), transparent 100%);
  transform: translateX(-50%);
}
[data-theme="dark"] .tl-container::before {
  background: linear-gradient(to bottom, transparent 0%, #3B82F6 60px, #3B82F6 calc(100% - 60px), transparent 100%);
}

/* ── Era Header ──────────────────────────────────────────── */
.tl-era {
  text-align: center; padding: 48px 0 32px;
  position: relative; clear: both;
}
.tl-era-num {
  font-family: 'Clash Display', 'Helvetica Neue', sans-serif;
  font-size: 64px; font-weight: 900;
  color: var(--color-blueprint); opacity: 0.12;
  line-height: 1; letter-spacing: -0.04em;
  position: absolute; left: 50%; transform: translateX(-50%);
  top: 20px; pointer-events: none;
}
[data-theme="dark"] .tl-era-num { color: #3B82F6; opacity: 0.15; }
.tl-era-title {
  font-family: 'Clash Display', 'Helvetica Neue', sans-serif;
  font-size: 13px; font-weight: 800;
  letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--color-blueprint);
  background: #F0F4FF; padding: 6px 24px;
  display: inline-block; position: relative; z-index: 1;
  border: 1.5px solid rgba(29,78,216,0.20);
  border-radius: 100px;
}
[data-theme="dark"] .tl-era-title {
  background: #0C1929; color: #3B82F6;
  border-color: rgba(59,130,246,0.25);
}
.tl-era-range {
  font-family: 'Courier New', monospace;
  font-size: 10px; font-weight: 500;
  color: var(--color-text-3); letter-spacing: 0.08em;
  margin-top: 8px; display: block;
}

/* ── Timeline Node ───────────────────────────────────────── */
.tl-node {
  display: flex; align-items: flex-start;
  margin-bottom: 24px; position: relative;
  opacity: 0; transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.tl-node.is-visible { opacity: 1; transform: translateY(0); }
.tl-node.is-hidden { display: none; }

/* Alternating layout */
.tl-node:nth-child(odd) { flex-direction: row; }
.tl-node:nth-child(even) { flex-direction: row-reverse; }
.tl-node:nth-child(odd) .tl-card { margin-right: auto; margin-left: 0; text-align: left; }
.tl-node:nth-child(even) .tl-card { margin-left: auto; margin-right: 0; text-align: left; }

/* Bubble on the line */
.tl-bubble {
  position: absolute; left: 50%; top: 16px;
  width: 16px; height: 16px; border-radius: 50%;
  background: #fff; border: 3px solid var(--color-blueprint);
  transform: translateX(-50%); z-index: 2;
  cursor: pointer; transition: all 0.25s ease;
  box-shadow: 0 0 0 4px rgba(29,78,216,0.08);
}
.tl-bubble:hover, .tl-node.expanded .tl-bubble {
  background: var(--color-blueprint); border-color: var(--color-blueprint);
  box-shadow: 0 0 0 6px rgba(29,78,216,0.15), 0 0 20px rgba(29,78,216,0.20);
  transform: translateX(-50%) scale(1.3);
}
.tl-node.is-tool .tl-bubble {
  width: 22px; height: 22px; top: 12px;
  background: var(--color-blueprint); border-color: var(--color-blueprint);
}
[data-theme="dark"] .tl-bubble {
  background: #122240; border-color: #3B82F6;
  box-shadow: 0 0 0 4px rgba(59,130,246,0.10);
}
[data-theme="dark"] .tl-bubble:hover, [data-theme="dark"] .tl-node.expanded .tl-bubble {
  background: #3B82F6;
  box-shadow: 0 0 0 6px rgba(59,130,246,0.20), 0 0 20px rgba(59,130,246,0.30);
}

/* Card (collapsed) */
.tl-card {
  width: calc(50% - 40px);
  background: #fff; border: 1px solid rgba(29,78,216,0.12);
  border-radius: 16px; padding: 18px 20px;
  cursor: pointer; transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(29,78,216,0.06);
}
.tl-card:hover {
  border-color: rgba(29,78,216,0.30);
  box-shadow: 0 6px 20px rgba(29,78,216,0.10);
  transform: translateY(-2px);
}
[data-theme="dark"] .tl-card {
  background: #122240; border-color: rgba(59,130,246,0.15);
  box-shadow: 0 2px 8px rgba(0,0,0,0.20);
}
[data-theme="dark"] .tl-card:hover {
  border-color: rgba(59,130,246,0.35);
  box-shadow: 0 6px 20px rgba(59,130,246,0.12);
}

/* Card Header */
.tl-card-head { display: flex; align-items: baseline; gap: 10px; margin-bottom: 6px; }
.tl-card-year {
  font-family: 'Courier New', monospace;
  font-size: 11px; font-weight: 700;
  color: var(--color-blueprint); letter-spacing: 0.04em;
  flex-shrink: 0;
}
[data-theme="dark"] .tl-card-year { color: #3B82F6; }
.tl-card-term {
  font-family: 'Clash Display', 'Helvetica Neue', sans-serif;
  font-size: 17px; font-weight: 700;
  color: var(--color-text); letter-spacing: -0.02em;
  line-height: 1.2;
}
.tl-card-cat {
  font-size: 9px; font-weight: 700;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--color-blueprint); opacity: 0.7;
}
[data-theme="dark"] .tl-card-cat { color: #3B82F6; }
.tl-card-def {
  font-size: 13px; line-height: 1.65;
  color: var(--color-text-2); font-weight: 450;
  margin-top: 4px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Card Expanded */
.tl-node.expanded .tl-card {
  border-color: var(--color-blueprint);
  box-shadow: 0 8px 32px rgba(29,78,216,0.12);
}
[data-theme="dark"] .tl-node.expanded .tl-card {
  border-color: #3B82F6;
  box-shadow: 0 8px 32px rgba(59,130,246,0.15);
}
.tl-node.expanded .tl-card-def {
  -webkit-line-clamp: unset; overflow: visible;
}
.tl-card-extra { display: none; margin-top: 12px; }
.tl-node.expanded .tl-card-extra { display: block; }
.tl-card-quote {
  font-size: 12.5px; font-style: italic;
  color: var(--color-text-2); line-height: 1.6;
  border-left: 2px solid var(--color-blueprint);
  padding-left: 12px; margin: 10px 0;
}
[data-theme="dark"] .tl-card-quote { border-color: #3B82F6; }
.tl-card-source {
  font-size: 10px; font-weight: 500;
  color: var(--color-text-3); letter-spacing: 0.04em;
  padding-top: 10px; border-top: 1px solid var(--color-border);
  margin-top: 10px;
}
.tl-card-tags { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 8px; }
.tl-tag {
  font-size: 9px; font-weight: 600;
  letter-spacing: 0.08em; text-transform: uppercase;
  padding: 3px 10px; border-radius: 100px;
  background: rgba(29,78,216,0.08); color: var(--color-blueprint);
}
[data-theme="dark"] .tl-tag { background: rgba(59,130,246,0.12); color: #3B82F6; }

/* Tool Node Special */
.tl-node.is-tool .tl-card {
  border-left: 4px solid var(--color-blueprint);
}
[data-theme="dark"] .tl-node.is-tool .tl-card { border-left-color: #3B82F6; }
.tl-tool-cta {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: 10px; padding: 8px 18px;
  font-size: 10px; font-weight: 700;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: #fff; background: var(--color-blueprint);
  border: none; border-radius: 100px;
  cursor: pointer; transition: all 0.2s;
}
.tl-tool-cta:hover { box-shadow: 0 4px 16px rgba(29,78,216,0.30); transform: translateY(-1px); }
[data-theme="dark"] .tl-tool-cta { background: #3B82F6; }

/* ── Search Highlight ────────────────────────────────────── */
.tl-highlight { background: rgba(29,78,216,0.15); border-radius: 2px; padding: 0 2px; }
[data-theme="dark"] .tl-highlight { background: rgba(59,130,246,0.25); }

/* ── Responsive — Tablet ─────────────────────────────────── */
@media (max-width: 1024px) {
  .tl-container { max-width: 720px; padding: 30px 30px 100px; }
}

/* ── Responsive — Mobile ─────────────────────────────────── */
@media (max-width: 640px) {
  .archipedia-header { padding: 14px 16px; }
  .archipedia-header-center { display: none; }
  .tl-controls { padding: 12px 16px; gap: 10px; top: 48px; flex-direction: column; align-items: stretch; }
  .tl-main-filters { justify-content: center; }
  .tl-search-wrap { max-width: 100%; }
  .tl-epoch-nav { justify-content: center; margin-left: 0; }
  .tl-container { padding: 24px 16px 100px; }

  /* Single column — all nodes left-aligned */
  .tl-container::before { left: 20px; }
  .tl-node, .tl-node:nth-child(odd), .tl-node:nth-child(even) { flex-direction: row; }
  .tl-bubble { left: 20px; }
  .tl-card, .tl-node:nth-child(odd) .tl-card, .tl-node:nth-child(even) .tl-card {
    width: calc(100% - 48px); margin-left: 48px; margin-right: 0;
  }
  .tl-era-title { font-size: 11px; padding: 5px 16px; }
  .tl-era-num { font-size: 40px; }
  .tl-era { padding: 32px 0 20px; }
}

/* ============================================================
   SHANNON INTRO BLOCK (Chapter 02)
   ============================================================ */

.shannon-intro-block {
  margin-top: 20px;
  padding: 22px 26px;
  background: var(--color-orange-t1);
  border: 1px solid rgba(255,87,51,0.14);
  border-radius: var(--r-xl);
  position: relative;
}
.shannon-intro-text {
  font-size: 15px;
  line-height: 1.80;
  color: var(--color-text-2);
  font-weight: 450;
  margin-bottom: 16px;
}
.shannon-intro-btn {
  display: inline-flex;
  align-items: center;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-orange);
  background: var(--color-orange-t1);
  border: 1px solid rgba(255,87,51,0.25);
  border-radius: 100px;
  padding: 7px 16px;
  cursor: pointer;
  transition: all var(--t-fast);
  font-family: inherit;
}
.shannon-intro-btn:hover {
  background: var(--color-orange-t1);
  border-color: rgba(255,87,51,0.45);
}

/* ============================================================
   SHANNON PART LABEL & BRIDGE (Chapter 02 — Two-Part Structure)
   ============================================================ */

.shannon-part-label {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 32px 0 8px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-orange);
}
.shannon-part-label::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-orange);
  flex-shrink: 0;
}
.shannon-part-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, rgba(255,87,51,0.25), transparent);
}

.shannon-bridge-card {
  background: rgba(28,28,30,0.88);
  border-radius: var(--r-xl);
  padding: 28px 28px 24px;
  margin: 24px 0;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
.shannon-bridge-text {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(245,245,247,0.7);
  margin-bottom: 24px;
  font-weight: 450;
}
.shannon-bridge-cols {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 20px;
}
.shannon-bridge-col {
  flex: 1;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
  padding: 16px 18px;
}
.shannon-bridge-col-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(245,245,247,0.4);
  margin-bottom: 8px;
}
.shannon-bridge-col-items {
  font-size: 14px;
  font-weight: 600;
  color: #F0F0F2;
  line-height: 1.6;
}
.shannon-bridge-arrow {
  font-size: 20px;
  color: var(--color-orange);
  margin-top: 28px;
  flex-shrink: 0;
}
.shannon-bridge-formula {
  text-align: center;
  font-size: clamp(22px, 5vw, 32px);
  font-weight: 700;
  font-family: monospace;
  color: var(--color-orange);
  letter-spacing: 0.04em;
  padding: 12px 0 4px;
  border-top: 1px solid rgba(255,255,255,0.08);
}

@media (max-width: 600px) {
  .shannon-bridge-cols { flex-direction: column; gap: 8px; }
  .shannon-bridge-arrow { display: none; }
  .shannon-bridge-card { padding: 20px 18px 18px; }
}

/* ============================================================
   SHANNON STEP CARDS (Chapter 02 — Leitfaden)
   ============================================================ */

.shannon-step-card {
  background: rgba(255,255,255,0.82);
  border: 1px solid rgba(0,0,0,0.07);
  border-radius: var(--r-xl);
  padding: 24px 26px 20px;
  margin-top: 16px;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(16px);

  transition: box-shadow var(--t-fast), transform var(--t-fast);
}
.shannon-step-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(to right, var(--color-orange), transparent);
}
.shannon-step-card:hover {
  box-shadow: 0 6px 20px rgba(0,0,0,0.08);
  transform: translateY(-1px);
}
.shannon-step-header {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 12px;
}
.shannon-step-badge {
  flex-shrink: 0;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-orange);
  background: var(--color-orange-t1);
  border: 1px solid rgba(255,87,51,0.20);
  border-radius: 100px;
  padding: 4px 10px;
  margin-top: 2px;
  white-space: nowrap;
}
.shannon-step-heading {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.01em;
  line-height: 1.35;
  margin: 0;
  border: none;
  text-transform: none;
  color: var(--color-text);
}
/* override generic h3 styles inside content-block */
.shannon-step-card .shannon-step-heading::before { display: none; }
.shannon-step-text {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--color-text-2);
  margin-bottom: 16px;
  font-weight: 450;
}
.shannon-step-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-orange);
  background: var(--color-orange-t1);
  border: 1px solid rgba(255,87,51,0.25);
  border-radius: 100px;
  padding: 7px 16px;
  cursor: pointer;
  transition: all var(--t-fast);
  font-family: inherit;
}
.shannon-step-btn:hover {
  background: var(--color-orange-t1);
  border-color: rgba(255,87,51,0.45);
}

/* ============================================================
   SCANNER EMBED (Chapter 02 — inline Bild-Entropie-Scanner)
   ============================================================ */

.scanner-embed-wrap {
  margin-top: 28px;
  border: 1px solid rgba(255,87,51,0.18);
  border-radius: var(--r-xl);
  overflow: hidden;
  background: rgba(255,255,255,0.5);
  position: relative;
}
.scanner-embed-wrap::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(to right, var(--color-orange), transparent);
  z-index: 1;
}
.scanner-embed-header {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 24px 16px;
  border-bottom: 1px solid rgba(0,0,0,0.06);
}
.scanner-embed-body { flex: 1; }
.scanner-embed-badge {
  flex-shrink: 0;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--color-orange);
  background: var(--color-orange-t1);
  border: 1px solid rgba(255,87,51,0.20);
  border-radius: 100px;
  padding: 4px 10px;
  margin-top: 2px;
}
.scanner-embed-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 3px;
  letter-spacing: 0.02em;
}
.scanner-embed-desc {
  font-size: 12px;
  color: var(--color-text-3);
  line-height: 1.5;
}
.scanner-embed-full-btn {
  flex-shrink: 0;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-orange);
  background: var(--color-orange-t1);
  border: 1px solid rgba(255,87,51,0.25);
  border-radius: 100px;
  padding: 7px 14px;
  cursor: pointer;
  transition: all var(--t-fast);
  font-family: inherit;
  white-space: nowrap;
}
.scanner-embed-full-btn:hover {
  background: var(--color-orange-t1);
  border-color: rgba(255,87,51,0.45);
}
.scanner-embed-frame {
  display: block;
  width: 100%;
  height: 680px;
  border: none;
  background: var(--color-bg);
}
@media (max-width: 600px) {
  .scanner-embed-frame { height: 820px; }
  .scanner-embed-full-btn { display: none; }
}

/* ============================================================
   SHANNON CTA CARD (Chapter 02)
   ============================================================ */

.shannon-cta-card {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 24px 28px;
  margin-top: 24px;
  background: var(--color-orange-t3);
  border: 1px solid rgba(255, 87, 51, 0.20);
  border-radius: var(--r-xl);
  cursor: pointer;
  transition: all var(--t-fast);
  position: relative;
  overflow: hidden;
}
.shannon-cta-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(to right, var(--color-orange), transparent);
}
.shannon-cta-card:hover {
  background: var(--color-orange-t3);
  border-color: rgba(255, 87, 51, 0.38);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255,87,51,0.10);
}
.shannon-cta-icon {
  font-size: 26px;
  color: var(--color-orange);
  min-width: 36px;
  text-align: center;
  font-family: Georgia, serif;
  line-height: 1;
}
.shannon-cta-body { flex: 1; }
.shannon-cta-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
  letter-spacing: 0.02em;
}
.shannon-cta-sub {
  font-size: 11.5px;
  color: var(--color-text-3);
  letter-spacing: 0.02em;
}
.shannon-cta-btn {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--color-orange);
  padding: 7px 13px;
  border: 1px solid rgba(255,87,51,0.32);
  border-radius: 100px;
  transition: all var(--t-fast);
  white-space: nowrap;
}
.shannon-cta-card:hover .shannon-cta-btn {
  background: var(--color-orange-t3);
  border-color: rgba(255,87,51,0.55);
}

/* ============================================================
   ARCHITOOL IFRAME OVERLAY
   ============================================================ */

#architool-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 500;
}

#architool-overlay.active {
  display: flex;
  flex-direction: column;
}

/* Full-screen sheet: header strip + iframe */
#architool-container {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
}

/* Header strip with back button */
#architool-close {
  flex-shrink: 0;
  align-self: flex-start;
  margin: 12px 16px;
  height: 36px;
  padding: 0 16px 0 12px;
  border-radius: 100px;
  background: var(--color-fill-2);
  border: none;
  display: flex;
  align-items: center;
  gap: 7px;
  cursor: pointer;
  color: var(--color-text);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  transition: background 0.2s;
}
#architool-close:hover { background: rgba(0,0,0,0.10); }
#architool-close svg { width: 14px; height: 14px; flex-shrink: 0; }

/* iframe fills remaining height below close button */
#architool-frame {
  flex: 1;
  width: 100%;
  min-height: 0;
  border: none;
  border-top: 1px solid var(--color-border);
}

/* ============================================================
   BIT CALCULATOR WIDGET — THE SIGNAL Design
   ============================================================ */

.bit-calc-widget {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--r-xl);
  overflow: hidden;
  margin: 36px 0 0;
  backdrop-filter: blur(16px);

  box-shadow: var(--shadow-md);
}

.bit-calc-topbar {
  display: flex;
  align-items: center;
  padding: 0 22px;
  height: 52px;
  background: rgba(245,245,247,0.88);
  backdrop-filter: blur(24px);

  border-bottom: 1px solid var(--color-border);
}

.bit-calc-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text);
}

.bit-calc-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-orange);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
  animation: signal-broadcast 2.6s ease-out infinite;
}

.bit-calc-tabs {
  margin-left: auto;
  display: flex;
  gap: 2px;
  background: var(--color-fill-2);
  border-radius: 22px;
  padding: 3px;
}

.bc-tab {
  padding: 5px 16px;
  border-radius: 18px;
  border: none;
  cursor: pointer;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: transparent;
  color: var(--color-text-2);
  transition: all var(--t-fast);
  font-family: var(--font);
}

.bc-tab.active {
  background: #fff;
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
}

.bit-calc-body {
  padding: 24px 22px 28px;
}

/* Result hero */
.bc-result-hero {
  background: var(--color-orange-t1);
  border: 1px solid rgba(255,87,51,0.15);
  border-radius: var(--r-lg);
  padding: 28px 24px;
  margin-bottom: 14px;
  position: relative;
  overflow: hidden;
}
.bc-result-hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--color-orange), transparent);
}
.bc-result-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-orange);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 7px;
}
.bc-result-label::before {
  content: '';
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--color-orange);
  flex-shrink: 0;
}
.bc-result-value {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 6px;
}
.bc-result-number {
  font-size: 56px;
  font-weight: 700;
  letter-spacing: -3px;
  line-height: 1;
  color: var(--color-text);
}
.bc-result-unit {
  font-size: 18px;
  color: var(--color-text-2);
  font-weight: 450;
}
.bc-formula {
  margin-top: 12px;
  padding: 10px 14px;
  background: var(--color-fill);
  border-radius: 10px;
  font-size: 12px;
  color: var(--color-text-2);
  font-family: Georgia, serif;
  line-height: 1.8;
  border: 1px solid var(--color-border);
}
.bc-formula-arrow { margin: 0 6px; color: var(--color-text-3); }
.bc-formula-eq    { margin-left: 6px; color: var(--color-orange); font-weight: 700; }
.bc-match {
  margin-top: 14px;
  padding: 12px 16px;
  background: var(--color-orange-t2);
  border: 1px solid rgba(255,87,51,0.16);
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  gap: 12px;
}
.bc-match-icon  { font-size: 24px; }
.bc-match-label { font-size: 11px; color: var(--color-text-3); margin-bottom: 2px; }
.bc-match-name  { font-weight: 600; font-size: 15px; color: var(--color-text); }
.bc-match-pct   { margin-left: auto; font-size: 22px; font-weight: 700; color: var(--color-orange); }
.bc-match-good  { color: #34c759; }
.bc-warning {
  margin-top: 12px;
  padding: 11px 14px;
  background: rgba(255,59,48,0.06);
  border: 1px solid rgba(255,59,48,0.14);
  border-radius: 10px;
  font-size: 12px;
  color: var(--color-error);
}

/* Sliders */
.bc-slider-row {
  background: var(--color-fill);
  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  padding: 18px 20px;
  margin-bottom: 10px;
}
.bc-slider-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 4px;
}
.bc-slider-label { font-weight: 600; font-size: 14px; color: var(--color-text); }
.bc-slider-sub   { font-size: 11px; color: var(--color-text-3); margin-top: 3px; }
.bc-slider-val   { font-size: 22px; font-weight: 700; letter-spacing: -0.5px; }
.bc-slider-track-wrap {
  position: relative;
  height: 22px;
  margin-top: 14px;
}
.bc-slider-track {
  position: absolute;
  top: 50%; left: 0; right: 0;
  height: 4px;
  border-radius: 2px;
  background: var(--color-border);
  transform: translateY(-50%);
}
.bc-slider-fill {
  position: absolute;
  left: 0; top: 0;
  height: 100%;
  border-radius: 2px;
  transition: width 0.08s;
}
.bc-slider-thumb {
  position: absolute;
  top: 50%;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #fff;
  border-width: 2.5px;
  border-style: solid;
  transform: translateY(-50%);
  pointer-events: none;
  transition: left 0.06s;
  box-shadow: var(--shadow-sm);
}
.bc-range {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
  margin: 0;
  -webkit-appearance: none;
}
.bc-delta-info {
  margin-top: 6px;
  padding: 12px 16px;
  background: var(--color-fill);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  font-size: 11px;
  color: var(--color-text-3);
  line-height: 1.7;
}
.bc-delta-info strong { color: var(--color-text-2); }

/* Reference tab */
.bc-ref-intro {
  font-size: 13px;
  color: var(--color-text-2);
  margin-bottom: 18px;
  line-height: 1.6;
}
.bc-bldg {
  background: var(--color-fill);
  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  padding: 16px 18px;
  margin-bottom: 8px;
  transition: all var(--t-fast);
}
.bc-bldg:hover {
  background: #fff;
  border-color: rgba(0,0,0,0.12);
}
.bc-bldg-active {
  background: var(--color-orange-t2) !important;
  border-color: rgba(255,87,51,0.20) !important;
}
.bc-bldg-header { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
.bc-bldg-icon {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: var(--color-fill-2);
  border: 1px solid var(--color-border);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; flex-shrink: 0;
}
.bc-bldg-name { font-weight: 600; font-size: 14px; color: var(--color-text); }
.bc-bldg-desc { font-size: 11px; color: var(--color-text-3); margin-top: 2px; }
.bc-bldg-bits {
  margin-left: auto; font-weight: 700; font-size: 15px; color: var(--color-text-2);
}
.bc-bldg-bits span   { font-size: 11px; opacity: 0.6; font-weight: 450; }
.bc-bldg-bits-active { color: var(--color-orange); }
.bc-bldg-bar {
  height: 3px; background: var(--color-border); border-radius: 2px; overflow: hidden;
}
.bc-bldg-bar-fill  { height: 100%; border-radius: 2px; background: var(--color-text-3); transition: all 0.4s; }
.bc-bldg-bar-active { background: var(--color-orange); box-shadow: 0 0 8px rgba(255,87,51,0.35); }
.bc-holographic {
  margin-top: 16px; padding: 22px;
  background: var(--color-orange-t1);
  border: 1px solid rgba(255,87,51,0.12);
  border-radius: var(--r-lg);
  font-size: 13px; line-height: 1.9;
  color: var(--color-text-2);
}
.bc-holographic-title {
  font-size: 13px; font-weight: 700; letter-spacing: 0.06em;
  color: var(--color-text); margin-bottom: 10px;
  display: flex; align-items: center; gap: 8px;
}
.bc-holographic-title::before {
  content: '';
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--color-orange);
  flex-shrink: 0;
}

/* ============================================================
   LAB — Chapter 4 Interactive Learning
   ============================================================ */

.lab-wrap {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* ── Tabs ─────────────────────────────────────────────────── */
.lab-tabs {
  display: flex;
  gap: 8px;
  background: var(--color-fill);
  border-radius: var(--r-lg);
  padding: 5px;
  border: 1px solid var(--color-border);
}

.lab-tab {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: var(--r-md);
  border: none;
  background: transparent;
  color: var(--color-text-2);
  font-family: var(--font);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: all var(--t-base);
}

.lab-tab.is-active {
  background: #fff;
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
}

.lab-tab-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background: var(--color-orange-t2);
  color: var(--color-orange);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0;
  flex-shrink: 0;
}

.lab-tab-badge--nb {
  background: rgba(0,0,0,0.06);
  color: var(--color-text-2);
}

.lab-tab.is-active .lab-tab-badge--nb {
  background: var(--color-text);
  color: #fff;
}

.lab-tab-name { letter-spacing: 0.12em; }

/* ── Panels ───────────────────────────────────────────────── */
.lab-panel {
  display: none;
  flex-direction: column;
  gap: 32px;
}

.lab-panel.is-active {
  display: flex;
}

/* ── Tool Intro Card ──────────────────────────────────────── */
.lab-tool-intro {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  background: var(--color-card);
  backdrop-filter: blur(16px);

  border-radius: var(--r-xl);
  border: 1px solid var(--color-border);
  padding: 24px;
}

.lab-tool-intro-num {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--color-orange-t2);
  color: var(--color-orange);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  flex-shrink: 0;
}

.lab-tool-intro-num--nb {
  background: var(--color-text);
  color: #fff;
}

.lab-tool-intro-body { flex: 1; }

.lab-tool-intro-name {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--color-orange);
  margin-bottom: 8px;
}

.lab-tool-intro-num--nb + .lab-tool-intro-body .lab-tool-intro-name {
  color: var(--color-text);
}

.lab-tool-intro-text {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  font-weight: 450;
  margin-bottom: 12px;
}

.lab-tool-intro-tag {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--color-text-2);
  background: var(--color-fill);
  border-radius: 20px;
  padding: 5px 12px;
  display: inline-block;
}

/* ── Section ──────────────────────────────────────────────── */
.lab-section {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.lab-s-eyebrow {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.26em;
  color: var(--color-orange);
  display: flex;
  align-items: center;
  gap: 8px;
}

.lab-s-eyebrow::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-orange);
  flex-shrink: 0;
}

.lab-s-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.01em;
  margin: 0;
}

.lab-text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text);
  font-weight: 450;
}

/* ── Prompt Anatomy — 4 Layers ────────────────────────────── */
.lab-layers-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.lab-layer {
  background: var(--color-card);
  border-radius: var(--r-lg);
  border: 1px solid var(--color-border);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.lab-layer-head {
  display: flex;
  align-items: center;
  gap: 10px;
}

.lab-layer-num {
  font-size: 11px;
  font-weight: 700;
  color: var(--color-orange);
  background: var(--color-orange-t3);
  border-radius: 7px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.lab-layer-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--color-text);
}

.lab-layer-desc {
  font-size: 12.5px;
  color: var(--color-text-2);
  line-height: 1.5;
  margin: 0;
}

.lab-chips-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.lab-chip {
  font-family: var(--font);
  font-size: 11.5px;
  font-weight: 500;
  color: var(--color-text);
  background: var(--color-fill);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 5px 11px;
  cursor: pointer;
  transition: all var(--t-fast);
  white-space: nowrap;
}

.lab-chip:hover {
  background: var(--color-orange);
  color: #fff;
  border-color: var(--color-orange);
  transform: translateY(-1px);
}

.lab-chip.copied {
  background: var(--color-text);
  color: #fff;
  border-color: var(--color-text);
}

/* ── Parameter Grid ───────────────────────────────────────── */
.lab-params-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.lab-param-card {
  background: var(--color-card);
  border-radius: var(--r-lg);
  border: 1px solid var(--color-border);
  padding: 16px;
  cursor: pointer;
  transition: all var(--t-fast);
  display: flex;
  flex-direction: column;
  gap: 7px;
  position: relative;
  overflow: hidden;
}

.lab-param-card:hover {
  border-color: var(--color-orange);
  box-shadow: 0 0 0 2px rgba(255,87,51,0.12);
  transform: translateY(-1px);
}

.lab-param-card.copied {
  border-color: var(--color-text);
  background: var(--color-text);
}

.lab-param-cmd {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-orange);
  font-family: 'SF Mono', 'Fira Code', monospace;
  letter-spacing: 0.02em;
}

.lab-param-card.copied .lab-param-cmd { color: #fff; }

.lab-param-desc {
  font-size: 12px;
  color: var(--color-text-2);
  line-height: 1.5;
}

.lab-param-card.copied .lab-param-desc { color: rgba(255,255,255,0.7); }

.lab-param-copy-btn {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--color-text-3);
  margin-top: 2px;
  transition: color var(--t-fast);
}

.lab-param-card:hover .lab-param-copy-btn { color: var(--color-orange); }
.lab-param-card.copied .lab-param-copy-btn { color: rgba(255,255,255,0.6); }

/* ── Case Study ───────────────────────────────────────────── */
.lab-case-img-wrap {
  position: relative;
  border-radius: var(--r-xl);
  overflow: hidden;
}

.lab-case-img {
  width: 100%;
  aspect-ratio: 4/5;
  object-fit: cover;
  display: block;
}

.lab-case-img-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 20px 18px 14px;
  background: linear-gradient(to top, rgba(0,0,0,0.55) 0%, transparent 100%);
  font-size: 11px;
  color: rgba(255,255,255,0.80);
  letter-spacing: 0.06em;
  font-weight: 500;
}

/* ── Prompt Breakdown ─────────────────────────────────────── */
.lab-prompt-breakdown {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.lab-pb-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 14px;
  background: var(--color-fill);
  border-radius: var(--r-md);
  border-left: 3px solid transparent;
}

.lab-pb-badge {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.16em;
  border-radius: 5px;
  padding: 3px 7px;
  flex-shrink: 0;
  margin-top: 2px;
}

.lab-pb-obj    { background: var(--color-orange-t4);  color: #d93b1b; }
.lab-pb-site   { background: rgba(0,120,200,0.12);  color: #0066aa; }
.lab-pb-light  { background: rgba(180,130,0,0.14);  color: #7a5500; }
.lab-pb-params { background: rgba(0,0,0,0.08);      color: var(--color-text-2); font-family: monospace; }

.lab-pb-text {
  font-size: 13px;
  line-height: 1.55;
  color: var(--color-text);
  font-weight: 450;
}

.lab-pb-row:has(.lab-pb-obj)    { border-left-color: rgba(255,87,51,0.5); }
.lab-pb-row:has(.lab-pb-site)   { border-left-color: rgba(0,120,200,0.4); }
.lab-pb-row:has(.lab-pb-light)  { border-left-color: rgba(180,130,0,0.4); }
.lab-pb-row:has(.lab-pb-params) { border-left-color: var(--color-border); }

/* ── Final Prompt ─────────────────────────────────────────── */
.lab-final-prompt {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--r-xl);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.lab-fp-label {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--color-orange);
}

.lab-fp-text {
  font-size: 13px;
  line-height: 1.75;
  color: var(--color-text);
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-weight: 400;
  background: var(--color-fill);
  border-radius: var(--r-md);
  padding: 14px;
  border: 1px solid var(--color-border);
}

.lab-fp-copy {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  background: var(--color-orange);
  color: #fff;
  border: none;
  border-radius: var(--r-md);
  font-family: var(--font);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: all var(--t-fast);
}

.lab-fp-copy:hover { opacity: 0.88; transform: translateY(-1px); }
.lab-fp-copy svg  { width: 13px; height: 13px; }

.lab-fp-copy.copied {
  background: var(--color-text);
}

/* ── Grid / Iteration ─────────────────────────────────────── */
.lab-grid-img {
  width: 100%;
  border-radius: var(--r-xl);
  display: block;
  box-shadow: var(--shadow-md);
}

.lab-grid-caption {
  font-size: 13px;
  line-height: 1.75;
  color: var(--color-text-2);
  font-weight: 450;
}

/* ── Workflow Steps ───────────────────────────────────────── */
.lab-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.lab-step {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  padding: 18px 0;
  border-bottom: 1px solid var(--color-border);
}

.lab-step:last-child { border-bottom: none; }

.lab-step-num {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--color-text);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}

.lab-step-content { flex: 1; }

.lab-step-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--color-text);
  margin-bottom: 6px;
}

.lab-step-text {
  font-size: 14px;
  line-height: 1.65;
  color: var(--color-text-2);
  font-weight: 450;
}

/* ── Interior Cards ───────────────────────────────────────── */
.lab-interiors {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.lab-interior-card {
  background: var(--color-card);
  border-radius: var(--r-xl);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.lab-interior-img-wrap {
  position: relative;
}

.lab-interior-img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  display: block;
}

.lab-interior-room-badge {
  position: absolute;
  top: 14px;
  left: 14px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  background: rgba(255,255,255,0.90);
  color: var(--color-text);
  border-radius: 20px;
  padding: 5px 12px;
  backdrop-filter: blur(8px);

}

.lab-interior-body {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.lab-interior-prompt-text {
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--color-text);
  font-family: 'SF Mono', 'Fira Code', monospace;
  background: var(--color-fill);
  border-radius: var(--r-md);
  padding: 12px;
  border: 1px solid var(--color-border);
}

.lab-interior-copy {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--color-fill-2);
  border: 1px solid var(--color-border);
  border-radius: var(--r-md);
  font-family: var(--font);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--t-fast);
  align-self: flex-start;
}

.lab-interior-copy:hover {
  background: var(--color-orange);
  color: #fff;
  border-color: var(--color-orange);
}

.lab-interior-copy.copied {
  background: var(--color-text);
  color: #fff;
  border-color: var(--color-text);
}

.lab-interior-copy svg { width: 12px; height: 12px; }

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 680px) {
  .lab-layers-grid  { grid-template-columns: 1fr; }
  .lab-params-grid  { grid-template-columns: 1fr; }
  .lab-tab-name     { display: none; }
  .lab-tab          { padding: 12px; }
  .lab-tool-intro   { flex-direction: column; gap: 14px; }
}

/* Exterior shots — 4:5 ratio like portraits */
.lab-interior-img--exterior {
  aspect-ratio: 4/5;
}

/* ═══════════════════════════════════════════════════════════
   CHAPTER 3 — CODEX (Algorithmische Blaupause)
   ═══════════════════════════════════════════════════════════ */

/* ── Wrapper ──────────────────────────────────────────────── */
.codex-wrap {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 780px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

/* ── Sticky Nav Pills ─────────────────────────────────────── */
.codex-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  padding: 14px 0 12px;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 48px;
}

.codex-nav-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--color-border);
  border-radius: 40px;
  background: var(--color-card);
  backdrop-filter: blur(12px);

  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-display);
}

.codex-nav-pill:hover {
  border-color: var(--color-orange);
  color: var(--color-orange);
}

.codex-nav-pill.is-active {
  background: var(--color-orange);
  border-color: var(--color-orange);
  color: #fff;
}

.cdx-pill-num {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.08em;
  opacity: 0.7;
}

.codex-nav-pill.is-active .cdx-pill-num { opacity: 1; }

.cdx-pill-label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ── Section Base ─────────────────────────────────────────── */
.codex-section {
  padding-top: 32px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--color-border);
}

.codex-section:last-child { border-bottom: none; }

.cdx-eyebrow {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-text);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.cdx-eyebrow::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-orange);
  flex-shrink: 0;
}

.cdx-title {
  font-size: clamp(22px, 3.5vw, 32px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text);
  line-height: 1.15;
  margin-bottom: 16px;
}

.cdx-text {
  font-size: 15px;
  font-weight: 450;
  line-height: 1.8;
  color: var(--color-text);
  opacity: 0.90;
  margin-bottom: 12px;
}

.cdx-principle {
  background: var(--color-orange-t2);
  border-left: 3px solid var(--color-orange);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  padding: 16px 20px;
  margin: 20px 0;
}

.cdx-principle-label {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-orange);
  margin-bottom: 6px;
}

.cdx-principle-text {
  font-size: 15px;
  font-weight: 450;
  font-style: italic;
  line-height: 1.65;
  color: var(--color-text);
}

/* ── §01 Compare Grid ─────────────────────────────────────── */
.cdx-compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 24px 0;
}

.cdx-compare-card {
  background: var(--color-card);
  backdrop-filter: blur(16px);

  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.cdx-cmp-tag {
  display: inline-block;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 20px;
  margin-bottom: 4px;
}

.cdx-tag-w {
  background: var(--color-orange-t2);
  color: var(--color-orange);
}

.cdx-tag-s {
  background: rgba(29, 29, 31, 0.08);
  color: var(--color-text);
}

.cdx-cmp-weak { opacity: 0.7; }
.cdx-cmp-word {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  font-style: italic;
  margin-bottom: 2px;
}

.cdx-cmp-prob {
  font-size: 11px;
  font-weight: 500;
  color: var(--color-text);
  opacity: 0.85;
  line-height: 1.5;
}

/* ── §01 Three Dimensions ─────────────────────────────────── */
.cdx-dims {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 24px 0;
}

.cdx-dim {
  background: var(--color-card);
  backdrop-filter: blur(16px);

  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  padding: 20px 16px;
  text-align: center;
}

.cdx-dim-num {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-orange);
  line-height: 1;
  margin-bottom: 8px;
}

.cdx-dim-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text);
  margin-bottom: 8px;
}

.cdx-dim-text {
  font-size: 12px;
  font-weight: 450;
  line-height: 1.6;
  color: var(--color-text);
  opacity: 0.88;
}

/* ── §02 Annotated Prompt ─────────────────────────────────── */
.cdx-ap-block {
  background: var(--color-card);
  backdrop-filter: blur(16px);

  border: 1px solid var(--color-border);
  border-radius: var(--r-xl);
  padding: 24px;
  margin: 24px 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cdx-ap-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.cdx-ap-tag {
  flex-shrink: 0;
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 20px;
  min-width: 80px;
  text-align: center;
  margin-top: 2px;
}

/* Tag color variants */
.cdx-ap-medium     { background: var(--color-orange-t4); color: #c93a1c; }
.cdx-ap-context    { background: var(--color-fill-2);  color: var(--color-text-2); }
.cdx-ap-material   { background: rgba(0,120,200,0.12); color: #0070c9; }
.cdx-ap-light      { background: rgba(255,200,0,0.18); color: #8a6d00; }
.cdx-ap-composition{ background: rgba(120,60,200,0.12);color: #6b3db5; }
.cdx-ap-format     { background: rgba(0,180,100,0.12); color: #007a40; }
.cdx-ap-negative   { background: rgba(200,0,0,0.10);   color: #c00; }

.cdx-ap-text {
  font-size: 13.5px;
  font-weight: 450;
  line-height: 1.6;
  color: var(--color-text);
  flex: 1;
}

.cdx-ap-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.cdx-ap-header-label {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-text);
  opacity: 0.35;
}

.cdx-ap-copy {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  cursor: pointer;
  color: var(--color-text);
  opacity: 0.45;
  transition: all 0.18s;
  flex-shrink: 0;
}

.cdx-ap-copy svg { width: 13px; height: 13px; }

.cdx-ap-copy:hover { opacity: 1; border-color: var(--color-orange); color: var(--color-orange); background: var(--color-orange-t2); }
.cdx-ap-copy.copied { background: var(--color-text); color: #fff; border-color: var(--color-text); opacity: 1; }

/* ── §02 Params 7 Grid ────────────────────────────────────── */
.cdx-params7 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
  margin: 24px 0;
}

.cdx-p7-card {
  background: var(--color-card);
  backdrop-filter: blur(16px);

  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  padding: 16px;
}

.cdx-p7-name {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-orange);
  margin-bottom: 6px;
}

.cdx-p7-ex {
  font-size: 12.5px;
  font-weight: 450;
  font-style: italic;
  color: var(--color-text);
  line-height: 1.5;
  margin-bottom: 6px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--color-border);
}

.cdx-p7-fx {
  font-size: 11.5px;
  font-weight: 450;
  color: var(--color-text);
  opacity: 0.82;
  line-height: 1.5;
}

/* ── §03 Ecosystem Groups ─────────────────────────────────── */
.cdx-eco {
  margin-bottom: 32px;
}

.cdx-eco-label {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 20px;
  display: inline-block;
  margin-bottom: 14px;
}

.cdx-eco--orange .cdx-eco-label {
  background: var(--color-orange-t2);
  color: var(--color-orange);
}

.cdx-eco--blue .cdx-eco-label {
  background: rgba(0, 120, 200, 0.10);
  color: #0070c9;
}

.cdx-eco--dark .cdx-eco-label {
  background: rgba(29, 29, 31, 0.08);
  color: var(--color-text);
}

.cdx-tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 10px;
}

.cdx-tool-card {
  background: var(--color-card);
  backdrop-filter: blur(16px);

  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.cdx-tool-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.cdx-eco--orange .cdx-tool-card:hover { border-color: var(--color-orange); }
.cdx-eco--blue   .cdx-tool-card:hover { border-color: #0070c9; }

.cdx-tool-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 4px;
}

.cdx-tool-name {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-text);
}

.cdx-tool-role {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 3px 7px;
  border-radius: 14px;
  white-space: nowrap;
  flex-shrink: 0;
}

.cdx-eco--orange .cdx-tool-role { background: var(--color-orange-t2); color: var(--color-orange); }
.cdx-eco--blue   .cdx-tool-role { background: rgba(0,120,200,0.12); color: #0070c9; }
.cdx-eco--dark   .cdx-tool-role { background: rgba(29,29,31,0.08);  color: var(--color-text); }

.cdx-tool-desc {
  font-size: 12.5px;
  font-weight: 450;
  line-height: 1.6;
  color: var(--color-text);
  opacity: 0.87;
}

.cdx-tool-when {
  font-size: 11px;
  font-weight: 500;
  color: var(--color-text);
  opacity: 0.65;
  line-height: 1.5;
  margin-top: 4px;
}

/* ── §04 Prompt Ladder ────────────────────────────────────── */
.cdx-ladder {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 24px 0;
}

.cdx-rung {
  background: var(--color-card);
  backdrop-filter: blur(16px);

  border: 1px solid var(--color-border);
  border-radius: var(--r-xl);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.cdx-rung-head {
  display: flex;
  align-items: center;
  gap: 14px;
}

.cdx-rung-meta {
  display: flex;
  align-items: center;
  gap: 8px;
}

.cdx-rung-lv {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-text);
  opacity: 0.4;
}

.cdx-rung-lb {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-text);
}

.cdx-rung-qbar {
  flex: 1;
  height: 5px;
  background: var(--color-border);
  border-radius: 10px;
  overflow: hidden;
}

.cdx-qbar-fill {
  height: 100%;
  border-radius: 10px;
  transition: width 0.4s ease;
}

.cdx-qbar-num {
  font-size: 11px;
  font-weight: 700;
  min-width: 30px;
  text-align: right;
}

.cdx-rung-prompt {
  background: rgba(29, 29, 31, 0.04);
  border: 1px solid var(--color-border);
  border-radius: var(--r-sm);
  padding: 12px 16px;
  font-size: 12.5px;
  font-weight: 450;
  font-family: 'Courier New', monospace;
  line-height: 1.65;
  color: var(--color-text);
  word-break: break-word;
}

.cdx-rung-desc {
  font-size: 12px;
  font-weight: 450;
  line-height: 1.6;
  color: var(--color-text);
  opacity: 0.80;
}

.cdx-rung-copy {
  align-self: flex-end;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 6px 16px;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text);
  transition: all 0.2s;
}

.cdx-rung-copy:hover { background: var(--color-orange); color: #fff; border-color: var(--color-orange); }
.cdx-rung-copy.copied { background: var(--color-text); color: #fff; border-color: var(--color-text); }

/* ── §05 Failure Cards ────────────────────────────────────── */
.cdx-failures {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 24px 0;
}

.cdx-fail-card {
  background: var(--color-card);
  backdrop-filter: blur(16px);

  border: 1px solid rgba(200, 0, 0, 0.18);
  border-left: 4px solid rgba(200, 0, 0, 0.55);
  border-radius: var(--r-lg);
  padding: 20px;
  display: flex;
  gap: 16px;
}

.cdx-fail-num {
  font-size: 22px;
  font-weight: 700;
  color: rgba(180, 0, 0, 0.4);
  line-height: 1;
  flex-shrink: 0;
  min-width: 28px;
}

.cdx-fail-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.cdx-fail-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text);
}

.cdx-fail-desc {
  font-size: 13px;
  font-weight: 450;
  line-height: 1.65;
  color: var(--color-text);
  opacity: 0.87;
}

.cdx-fail-def {
  display: flex;
  gap: 8px;
  background: rgba(200,0,0,0.05);
  border-radius: var(--r-sm);
  padding: 10px 12px;
  margin-top: 4px;
}

.cdx-def-label {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(180,0,0,0.7);
  flex-shrink: 0;
  padding-top: 1px;
}

.cdx-def-text {
  font-size: 12px;
  font-weight: 450;
  font-style: italic;
  line-height: 1.55;
  color: var(--color-text);
  opacity: 0.8;
}

/* ── §06 Accordion ────────────────────────────────────────── */
.cdx-accordion {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 24px 0;
}

.cdx-acc-item {
  background: var(--color-card);
  backdrop-filter: blur(16px);

  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: border-color 0.2s;
}

.cdx-acc-item.is-open { border-color: var(--color-orange); }

.cdx-acc-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-display);
}

.cdx-acc-num {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-orange);
  min-width: 20px;
}

.cdx-acc-title {
  flex: 1;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.cdx-acc-chevron {
  width: 18px;
  height: 18px;
  color: var(--color-text);
  opacity: 0.4;
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

.cdx-acc-item.is-open .cdx-acc-chevron {
  transform: rotate(180deg);
  opacity: 0.8;
  color: var(--color-orange);
}

.cdx-acc-body {
  display: none;
  padding: 0 20px 18px 54px;
}

.cdx-acc-item.is-open .cdx-acc-body {
  display: block;
}

.cdx-acc-text {
  font-size: 13.5px;
  font-weight: 450;
  line-height: 1.75;
  color: var(--color-text);
  opacity: 0.8;
}

/* ── §07 Workflow ─────────────────────────────────────────── */
.cdx-workflow {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 24px 0;
  position: relative;
}

.cdx-workflow::before {
  content: '';
  position: absolute;
  left: 17px;
  top: 24px;
  bottom: 24px;
  width: 2px;
  background: var(--color-border);
}

.cdx-wf-step {
  display: flex;
  gap: 18px;
  padding: 0 0 24px;
  position: relative;
}

.cdx-wf-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-card);
  border: 2px solid var(--color-orange);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  color: var(--color-orange);
  flex-shrink: 0;
  z-index: 1;
  backdrop-filter: blur(8px);

}

.cdx-wf-body {
  flex: 1;
  padding-top: 6px;
}

.cdx-wf-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 4px;
}

.cdx-wf-desc {
  font-size: 13px;
  font-weight: 450;
  line-height: 1.65;
  color: var(--color-text);
  opacity: 0.82;
}

/* ── §07 Versions ─────────────────────────────────────────── */
.cdx-versions {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--r-xl);
  overflow: hidden;
  margin: 24px 0;
}

.cdx-ver-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--color-border);
  transition: background 0.15s;
}

.cdx-ver-row:last-child { border-bottom: none; }

.cdx-ver-row.cdx-ver-current {
  background: var(--color-orange-t3);
}

.cdx-ver-v {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-text);
  min-width: 38px;
  font-family: 'Courier New', monospace;
}

.cdx-ver-desc {
  flex: 1;
  font-size: 13px;
  font-weight: 450;
  color: var(--color-text);
  opacity: 0.8;
}

.cdx-ver-badge {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: 20px;
  background: var(--color-orange-t4);
  color: var(--color-orange);
}

.cdx-ver-badge--plan {
  background: rgba(29, 29, 31, 0.07);
  color: var(--color-text);
  opacity: 0.55;
}

/* ── Finale / Closing ─────────────────────────────────────── */
.cdx-finale {
  text-align: center;
  padding: 48px 24px;
}

.cdx-finale-text {
  font-size: 22px;
  font-weight: 450;
  font-style: italic;
  line-height: 1.6;
  color: var(--color-text);
  opacity: 0.87;
  margin-bottom: 16px;
}

.cdx-finale-closing {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-orange);
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 680px) {
  .codex-wrap       { padding: 0 16px 60px; }
  .codex-nav        { gap: 4px; }
  .cdx-pill-label   { display: none; }
  .cdx-compare-grid { grid-template-columns: 1fr; }
  .cdx-dims         { grid-template-columns: 1fr; }
  .cdx-params7      { grid-template-columns: 1fr; }
  .cdx-tool-grid    { grid-template-columns: 1fr; }
  .cdx-acc-body     { padding-left: 20px; }
  .cdx-fail-card    { flex-direction: column; gap: 8px; }
  .cdx-wf-step      { gap: 12px; }
  .codex-workflow::before { left: 14px; }
  .cdx-wf-num       { width: 30px; height: 30px; font-size: 11px; }
}

/* ═══════════════════════════════════════════════════════════
   CHAPTER 5 — ARCHETYPES (Visuelle Grammatik)
   ═══════════════════════════════════════════════════════════ */

.arc-wrap {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

/* ── Intro ────────────────────────────────────────────────── */
.arc-intro {
  padding: 32px 0 48px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 40px;
}

.arc-quote {
  font-size: clamp(16px, 2.2vw, 20px);
  font-weight: 450;
  font-style: italic;
  line-height: 1.65;
  color: var(--color-text);
  border-left: 3px solid var(--color-orange);
  padding-left: 20px;
  margin-bottom: 20px;
}

.arc-intro-text {
  font-size: 15px;
  font-weight: 450;
  line-height: 1.8;
  color: var(--color-text);
  opacity: 0.82;
}

/* ── Grid ─────────────────────────────────────────────────── */
.arc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* ── Card ─────────────────────────────────────────────────── */
.arc-card {
  background: var(--color-card);
  backdrop-filter: blur(16px);

  border: 1px solid var(--color-border);
  border-radius: var(--r-xl);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.arc-card:hover {
  border-color: var(--color-orange);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ── Card Head ────────────────────────────────────────────── */
.arc-card-head {
  display: flex;
  align-items: center;
  gap: 14px;
}

.arc-icon {
  width: 44px;
  height: 44px;
  background: var(--color-orange-t1);
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-orange);
}

.arc-icon svg {
  width: 24px;
  height: 24px;
}

.arc-meta {
  flex: 1;
}

.arc-num {
  display: block;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--color-orange);
  margin-bottom: 3px;
}

.arc-name {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-text);
  text-transform: uppercase;
  line-height: 1.2;
}

/* ── Gesture ──────────────────────────────────────────────── */
.arc-gesture {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: var(--color-orange-t2);
  border-radius: var(--r-sm);
  padding: 10px 14px;
}

.arc-gesture-label {
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-orange);
}

.arc-gesture-text {
  font-size: 13px;
  font-weight: 450;
  font-style: italic;
  color: var(--color-text);
  line-height: 1.5;
}

/* ── Description ──────────────────────────────────────────── */
.arc-desc {
  font-size: 13px;
  font-weight: 450;
  line-height: 1.75;
  color: var(--color-text);
  opacity: 0.83;
}

/* ── Examples ─────────────────────────────────────────────── */
.arc-section-label {
  display: block;
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-text);
  opacity: 0.4;
  margin-bottom: 8px;
}

.arc-examples {
  border-top: 1px solid var(--color-border);
  padding-top: 14px;
}

.arc-ex-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.arc-ex-list li {
  font-size: 12px;
  font-weight: 450;
  color: var(--color-text);
  line-height: 1.5;
}

.arc-ex-list strong {
  font-weight: 600;
}

.arc-year {
  font-size: 10px;
  font-weight: 500;
  color: var(--color-text);
  opacity: 0.45;
  margin-left: 3px;
}

/* ── Chips ────────────────────────────────────────────────── */
.arc-chips-block {
  border-top: 1px solid var(--color-border);
  padding-top: 14px;
}

.arc-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 2px;
}

.arc-chip {
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 5px 11px;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
  transition: all 0.18s ease;
}

.arc-chip:hover {
  background: var(--color-orange);
  border-color: var(--color-orange);
  color: #fff;
}

.arc-chip.copied {
  background: var(--color-text);
  border-color: var(--color-text);
  color: #fff;
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 680px) {
  .arc-wrap          { padding: 0 0 80px; max-width: 100%; width: 100%; }
  .arc-intro         { padding: 20px 0 28px; margin-bottom: 20px; }
  .arc-quote         { font-size: 15px; }
  .arc-grid          { grid-template-columns: 1fr; gap: 10px; }
  .arc-card          { padding: 16px; min-width: 0; width: 100%; gap: 0; }
  .arc-card-head     { padding-bottom: 0; }

  /* Collapsible body — hidden by default on mobile */
  .arc-card-body     { max-height: 0; overflow: hidden; transition: max-height 0.35s ease, padding 0.2s ease; padding-top: 0; }
  .arc-card.is-open .arc-card-body { max-height: 600px; padding-top: 14px; }

  /* Expand indicator */
  .arc-card-head::after {
    content: '+';
    margin-left: auto;
    font-size: 18px;
    font-weight: 300;
    color: var(--color-orange);
    line-height: 1;
    transition: transform 0.25s ease;
  }
  .arc-card.is-open .arc-card-head::after { transform: rotate(45deg); }
}

/* ═══════════════════════════════════════════════════════════
   CHAPTER 6 — MASTER MATRIX & PROMPT BUILDER
   ═══════════════════════════════════════════════════════════ */

.mx-wrap {
  display: flex;
  flex-direction: column;
  gap: 56px;
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

/* ── Section eyebrow ──────────────────────────────────────── */
.mx-section-eyebrow {
  display: block;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-orange);
  margin-bottom: 8px;
}

/* ── Builder ──────────────────────────────────────────────── */
.mx-builder {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.mx-builder-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.mx-builder-headline { flex: 1; }

.mx-formula-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 4px;
}

.mx-formula-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text);
  opacity: 0.4;
}

.mx-formula-text {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--color-text);
  opacity: 0.55;
}

.mx-builder-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.mx-clear-btn {
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 8px 16px;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  background: transparent;
  color: var(--color-text);
  opacity: 0.55;
  cursor: pointer;
  transition: all 0.18s;
}

.mx-clear-btn:hover { opacity: 1; border-color: var(--color-text); }

.mx-copy-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 8px 18px;
  border: 1px solid var(--color-orange);
  border-radius: 20px;
  background: var(--color-orange);
  color: #fff;
  cursor: pointer;
  transition: all 0.18s;
}

.mx-copy-btn svg { width: 13px; height: 13px; flex-shrink: 0; }
.mx-copy-btn:disabled { background: var(--color-border); border-color: var(--color-border); color: var(--color-text); opacity: 0.45; cursor: not-allowed; }
.mx-copy-btn:not(:disabled):hover { background: #e04220; border-color: #e04220; }
.mx-copy-btn.copied { background: var(--color-text); border-color: var(--color-text); }

/* ── Preview Card ─────────────────────────────────────────── */
.mx-preview-card {
  background: var(--color-card);
  backdrop-filter: blur(16px);

  border: 1.5px solid var(--color-border);
  border-radius: var(--r-xl);
  padding: 20px 24px;
  min-height: 90px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color 0.25s;
}

.mx-preview-card.has-content { border-color: var(--color-orange); }

.mx-preview-text {
  font-size: 13.5px;
  font-weight: 450;
  font-family: 'Courier New', monospace;
  line-height: 1.7;
  color: var(--color-text);
  word-break: break-word;
}

.mx-preview-text.is-empty {
  font-family: var(--font-display);
  font-size: 13px;
  font-style: italic;
  opacity: 0.35;
}

.mx-preview-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.mx-tag {
  font-size: 10px;
  font-weight: 500;
  padding: 3px 9px;
  background: var(--color-orange-t3);
  border-radius: 12px;
  color: var(--color-text);
}

.mx-tag strong { color: var(--color-orange); font-weight: 700; }

/* ── Steps ────────────────────────────────────────────────── */
.mx-steps {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.mx-step {
  background: var(--color-card);
  backdrop-filter: blur(12px);

  border: 1px solid var(--color-border);
  border-radius: var(--r-xl);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.mx-step-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.mx-step-n {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-orange);
  min-width: 22px;
  padding-top: 1px;
}

.mx-step-meta { display: flex; flex-direction: column; gap: 2px; }

.mx-step-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text);
}

.mx-step-sub {
  font-size: 11px;
  font-weight: 450;
  color: var(--color-text);
  opacity: 0.5;
}

/* ── Chips ────────────────────────────────────────────────── */
.mx-chips-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.mx-chip {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 9px 14px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--r-md);
  cursor: pointer;
  text-align: left;
  transition: all 0.18s;
  font-family: var(--font-display);
}

.mx-chip:hover {
  border-color: var(--color-orange);
  background: var(--color-orange-t3);
}

.mx-chip.is-selected {
  background: var(--color-orange);
  border-color: var(--color-orange);
}

.mx-chip-kw {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-text);
  text-transform: uppercase;
}

.mx-chip-sub {
  font-size: 10px;
  font-weight: 450;
  color: var(--color-text);
  opacity: 0.55;
}

.mx-chip.is-selected .mx-chip-kw,
.mx-chip.is-selected .mx-chip-sub { color: #fff; opacity: 1; }

/* ── Matrix Reference ─────────────────────────────────────── */
.mx-matrix-section { display: flex; flex-direction: column; gap: 20px; }

.mx-matrix-header { display: flex; flex-direction: column; gap: 4px; }

.mx-matrix-sub {
  font-size: 13px;
  font-weight: 450;
  color: var(--color-text);
  opacity: 0.5;
}

.mx-matrix-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.mx-col {
  background: var(--color-card);
  backdrop-filter: blur(12px);

  border: 1px solid var(--color-border);
  border-radius: var(--r-xl);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.mx-col-head {
  padding: 14px 16px 10px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-orange-t1);
}

.mx-col-title {
  display: block;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-orange);
  margin-bottom: 2px;
}

.mx-col-sub {
  font-size: 9px;
  font-weight: 500;
  color: var(--color-text);
  opacity: 0.45;
  letter-spacing: 0.05em;
}

.mx-matrix-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 11px 16px;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--color-border);
  cursor: pointer;
  text-align: left;
  font-family: var(--font-display);
  transition: background 0.15s;
}

.mx-matrix-item:last-child { border-bottom: none; }

.mx-matrix-item:hover { background: var(--color-orange-t2); }

.mx-matrix-item.copied { background: rgba(29,29,31,0.07); }

.mx-mi-kw {
  font-size: 11px;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.3;
}

.mx-mi-desc {
  font-size: 10px;
  font-weight: 450;
  color: var(--color-text);
  opacity: 0.55;
  line-height: 1.4;
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 720px) {
  .mx-wrap           { padding: 0 16px 60px; gap: 40px; }
  .mx-matrix-grid    { grid-template-columns: 1fr 1fr; }
  .mx-builder-header { flex-direction: column; }
  .mx-builder-actions{ align-self: flex-start; }
  .mx-step           { padding: 16px; }
}

@media (max-width: 480px) {
  .mx-matrix-grid    { grid-template-columns: 1fr; }
}

/* ============================================================
   MOBILE — iPhone / Touch Optimizations
   ============================================================ */

/* iOS safe area insets (home indicator / notch) */
#dashboard-section { padding-bottom: env(safe-area-inset-bottom, 0px); }
#chapter-section   { padding-bottom: env(safe-area-inset-bottom, 0px); }
#archipedia-section{ padding-bottom: env(safe-area-inset-bottom, 0px); }

@media (max-width: 640px) {
  /* Mobile tiles — reduce blur for performance */
  .chapter-tile {
    padding: 18px 14px;
    min-height: 160px;
    backdrop-filter: none;

    background: rgba(240, 240, 240, 0.75);
  }
  [data-theme="dark"] .chapter-tile {
    background: rgba(26, 26, 26, 0.75);
  }
  .tile-title   { font-size: 14px; }
  .tile-meta    { font-size: 8px; }
  .tile-num-bg  { font-size: 48px; top: 14px; left: 14px; }
  .tile-desc    { font-size: 11px; }

  #hero-section, #dashboard-section, #chapter-section, #archipedia-section {
    transition: opacity 0.2s ease, visibility 0s linear 0.2s;
  }
  #hero-section.active, #dashboard-section.active, #chapter-section.active, #archipedia-section.active {
    transition: opacity 0.2s ease, visibility 0s linear 0s;
  }

  /* Dashboard header — hide "8 Chapters" label to avoid crowding */
  .dashboard-meta > span:first-child { display: none; }

  /* Performance: remove blur from sticky headers (causes scroll jank on iOS) */
  .dashboard-header,
  .chapter-header,
  .archipedia-header {
    backdrop-filter: none;

    background: rgba(245, 245, 247, 0.99);
  }

  /* Performance: remove expensive dot-grid patterns on mobile */
  #dashboard-section,
  #chapter-section {
    background-image: none;
    background-color: var(--color-off-white);
  }

  /* Tile arrows always visible on touch (no hover on mobile) */
  .chapter-tile .tile-arrow {
    opacity: 1;
    transform: translateX(0);
  }

  /* Chapter typography — tighter for small screens */
  .chapter-subtitle {
    font-size: 15px;
    margin-bottom: 28px;
    padding-bottom: 24px;
  }

  .chapter-content { gap: 28px; }

  /* Refs list tighter */
  .chapter-refs { padding: 18px 20px; }

  /* Pull-quote tighter */
  .pull-quote { padding: 18px 20px; }

  /* Prompt chips slightly smaller */
  .mx-chip        { padding: 8px 12px; }
  .mx-chip-kw     { font-size: 10px; }

  /* Arc chips smaller on mobile */
  .arc-chip { padding: 7px 12px; font-size: 10px; }

  /* Lab chips */
  .lab-chip { padding: 10px 14px; }
}

/* Touch devices: hover overlay handled inline — no tile-arrow exists */

/* ============================================================
   GLOBAL MOBILE OVERFLOW + SCROLL FIX
   ============================================================ */
@media (max-width: 768px) {
  /* Prevent any child from causing horizontal scroll */
  #hero-section,
  #dashboard-section,
  #chapter-section,
  #archipedia-section {
    overflow-x: hidden;
    overscroll-behavior-y: contain;
  }

  /* All content wrappers — never wider than viewport */
  .chapter-content,
  .chapter-body,
  .codex-wrap,
  .lab-wrap,
  .arc-wrap,
  .mx-wrap,
  .archipedia-main,
  .dashboard-main {
    overflow-x: hidden;
    max-width: 100%;
  }

  /* Long text and code never breaks layout */
  .cdx-text, .cdx-principle-text, .cdx-acc-body,
  .content-block p, .pull-quote p,
  .shannon-step-text, .shannon-intro-text,
  .arch-card-def, .arch-card-quote {
    overflow-wrap: break-word;
    word-break: break-word;
  }

  /* AP-row tags — wrap instead of overflow */
  .cdx-ap-row      { flex-wrap: wrap; }
  .cdx-ap-tag      { flex-shrink: 0; }
  .cdx-ap-text     { overflow-wrap: break-word; word-break: break-word; min-width: 0; }

  /* Codex nav — scrollable pill bar, no wrap */
  .codex-nav       { overflow-x: auto; flex-wrap: nowrap; padding-bottom: 4px; -webkit-overflow-scrolling: touch; }
  .codex-nav-pill  { flex-shrink: 0; }

  /* Ladder items */
  .cdx-ladder-item { min-width: 0; overflow: hidden; }
  .cdx-ladder-prompt { overflow-wrap: break-word; word-break: break-word; }

  /* Ecosystem grid / tool cards */
  .cdx-tool-card   { min-width: 0; }
  .cdx-tool-when   { overflow-wrap: break-word; white-space: normal; }

  /* Images never overflow */
  img, canvas, iframe { max-width: 100%; }
}

/* ============================================================
   MOBILE — Comprehensive overrides (≤ 640px)
   ============================================================ */
@media (max-width: 640px) {

  /* ── Hero ──────────────────────────────────────────────── */
  .hero-title         { font-size: clamp(64px, 18vw, 96px); letter-spacing: -0.04em; }
  .hero-divider       { margin: 16px 0; }
  .hero-subline       { font-size: 13px; }
  .btn-access         { padding: 14px 28px; font-size: 12px; }

  /* ── Modal ─────────────────────────────────────────────── */
  .modal-card         { width: calc(100vw - 32px); padding: 36px 24px 32px; border-radius: 20px; }
  .modal-title        { font-size: 26px; }

  /* ── Dashboard ─────────────────────────────────────────── */
  .dashboard-logo     { font-size: 13px; }
  .dashboard-intro-title { font-size: clamp(22px, 7vw, 32px); }
  .dashboard-main     { padding: 24px 16px 150px; gap: 20px; }
  .chapters-grid      { grid-template-columns: 1fr; gap: 12px; }
  .chapters-grid .chapter-tile { grid-column: span 1 !important; }
  .chapter-tile       {
    padding: 28px 22px 24px;
    min-height: 180px;
  }

  /* Archipedia badge — flow under intro on mobile */
  .dashboard-archipedia {
    position: static;
    align-items: flex-start;
    margin-top: 12px;
  }
  .tile-num-bg          { font-size: 48px; top: 20px; left: 22px; }
  .tile-title           { font-size: 17px; }
  .tile-desc            { font-size: 13px; }
  .tile-meta            { font-size: 10px; }

  /* ── Chapter header ────────────────────────────────────── */
  .chapter-header     { padding: 12px 16px; gap: 8px; }
  .chapter-num-badge  { font-size: 10px; padding: 4px 10px; }
  .chapter-nav-btn    { width: 32px; height: 32px; }

  /* ── Chapter body ──────────────────────────────────────── */
  .chapter-body       { padding: 28px 16px 130px; }
  .chapter-eyebrow    { font-size: 9px; margin-bottom: 10px; }
  .chapter-main-title { font-size: clamp(24px, 8vw, 36px); margin-bottom: 10px; }
  .chapter-subtitle   { font-size: 14px; }
  .chapter-content    { gap: 20px; }
  .content-block      { padding: 0; }
  .content-block h3   { font-size: 9px; }
  .content-block p    { font-size: 14px; line-height: 1.75; }
  .pull-quote         { padding: 16px 18px; }
  .pull-quote p       { font-size: 14px; line-height: 1.7; }

  /* ── Shannon step cards ────────────────────────────────── */
  .shannon-step-card          { padding: 18px 18px 16px; }
  .shannon-step-header        { flex-direction: column; gap: 8px; align-items: flex-start; }
  .shannon-step-heading       { font-size: 13px; }
  .shannon-step-text          { font-size: 13.5px; }
  .shannon-intro-block        { padding: 18px 18px; }
  .shannon-intro-text         { font-size: 14px; }

  /* ── Scanner embed ─────────────────────────────────────── */
  .scanner-embed-header       { flex-wrap: wrap; padding: 16px 18px 12px; gap: 10px; }
  .scanner-embed-full-btn     { display: none; }
  .scanner-embed-frame        { height: 780px; }

  /* ── Archipedia ────────────────────────────────────────── */
  .archipedia-header          { padding: 12px 16px; }
  .archipedia-intro           { padding: 20px 16px 0; }
  .archipedia-intro-title     { font-size: 28px; }
  .archipedia-controls        { padding: 0 16px; flex-direction: column; gap: 12px; }
  .archipedia-filters         { overflow-x: auto; padding-bottom: 4px; flex-wrap: nowrap; }
  .archipedia-grid            { padding: 16px 16px 80px; grid-template-columns: 1fr; gap: 12px; }
  .arch-featured-card         { padding: 20px 18px; flex-direction: column; gap: 12px; }
  .arch-featured-icon         { font-size: 28px; }
  .arch-featured-title        { font-size: 18px; }
  .arch-card                  { padding: 16px 18px; }

  /* ── Architool overlay close button ───────────────────── */
  #architool-close            { margin: 8px 12px; padding: 0 12px 0 10px; height: 32px; font-size: 12px; }

  /* ── References ────────────────────────────────────────── */
  .chapter-references         { padding: 16px 18px; }
  .chapter-references li      { font-size: 12px; }
}

/* ============================================================
   MOBILE — Very small screens (≤ 390px / iPhone SE)
   ============================================================ */
@media (max-width: 390px) {
  .hero-title           { font-size: 58px; }
  .chapters-grid        { grid-template-columns: 1fr; gap: 10px; }
  .chapters-grid .chapter-tile { grid-column: span 1 !important; }
  .chapter-tile         { min-height: 160px; }
  .archipedia-grid      { grid-template-columns: 1fr; }
  .shannon-step-card    { padding: 14px 14px; }
  .scanner-embed-frame  { height: 720px; }
}

/* ============================================================
   FOCUS-VISIBLE — Keyboard Accessibility (WCAG 2.4.7)
   ============================================================ */
:focus-visible {
  outline: 2px solid var(--color-orange);
  outline-offset: 2px;
}
button:focus-visible,
a:focus-visible,
input:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--color-orange);
  outline-offset: 2px;
}
.hero-password-input:focus-visible {
  outline: 2px solid var(--color-orange);
  outline-offset: 0;
}
.chapter-tile:focus-visible {
  outline: 2px solid var(--color-signal);
  outline-offset: 2px;
}

/* ============================================================
   SITE FOOTER — Legal Link
   ============================================================ */
.site-footer {
  padding: 16px 24px 24px;
  text-align: center;
  display: none; /* hidden on hero, shown via JS on dashboard+ */
}
.site-footer a {
  font-family: var(--font);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--color-text-3);
  text-decoration: none;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.site-footer a:hover {
  color: var(--color-text-2);
}

/* ============================================================
   TOUCH TARGETS — Invisible 44px Hit Areas (WCAG 2.5.8)
   ============================================================ */
.btn-back,
.chapter-nav-btn,
.toolkit-item-copy,
.archipedia-search-clear,
.arch-filter-btn,
.lang-btn,
.portal-eye,
.theme-toggle,
.tile-status-btn,
.btn-logout,
.tl-toggle,
.btn-archipedia,
.btn-toolbox,
.shannon-intro-btn,
.shannon-step-btn,
.shannon-cta-btn,
.scanner-embed-full-btn,
.bc-tab,
.lab-chip,
.arch-featured-cta {
  position: relative;
}
.btn-back::after,
.chapter-nav-btn::after,
.toolkit-item-copy::after,
.archipedia-search-clear::after,
.arch-filter-btn::after,
.lang-btn::after,
.portal-lang-btn::after,
.portal-eye::after,
.theme-toggle::after,
.tile-status-btn::after,
.btn-logout::after,
.tl-toggle::after,
.btn-archipedia::after,
.btn-toolbox::after,
.shannon-intro-btn::after,
.shannon-step-btn::after,
.shannon-cta-btn::after,
.scanner-embed-full-btn::after,
.bc-tab::after,
.lab-chip::after,
.arch-featured-cta::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  min-width: 44px;
  min-height: 44px;
  width: 100%;
  height: 100%;
}

/* ── A11y helpers ─────────────────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -40px;
  left: 8px;
  background: #FF5733;
  color: #fff;
  padding: 8px 16px;
  border-radius: 4px;
  z-index: 9999;
  text-decoration: none;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: top 0.15s;
}
.skip-link:focus {
  top: 8px;
  outline: 2px solid #fff;
  outline-offset: 2px;
}
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}