/*
 * Bone Wizardry — Universal Theme
 * Based on the autoimmune diseases deep-dive design language.
 * Link this from any page: <link rel="stylesheet" href="/theme.css">
 * Page-specific styles go AFTER this import.
 */

/* ── DISPLAY FONT (matches biochem/gut-flora + fixed .page-nav crumb) ── */
@font-face {
  font-family: 'Heavyweight';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  /* No local(): a wrong system match can skip the bundled Bone Wizardry cut. */
  src: url('/fonts/heavyweight.woff') format('woff');
}

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

/* ── PRO STATE: hide all FREE/PRO indicators sitewide for signed-in Pro users ──
   Pro state is signaled by either body.pro (subject indexes, updates) or
   html.is-pro (homepage applyProUI). Cover both. */
body.pro .free-badge,
body.pro .lock-badge,
body.pro .recent-free,
body.pro .update-free,
body.pro .bw-elite-tag,
body.pro .page-nav-elite,
html.is-pro .free-badge,
html.is-pro .lock-badge,
html.is-pro .recent-free,
html.is-pro .update-free,
html.is-pro .bw-elite-tag,
html.is-pro .page-nav-elite { display: none !important; }

/* ── INLINE ELITE TAG - bookplate seal variant from Pill Redesigns.html ── */
.bw-elite-tag {
  display: inline-flex; align-items: center; gap: 0.34rem;
  font-size: 0.62rem; font-weight: 500;
  vertical-align: middle; margin-left: 6px;
  opacity: 0.94;
  line-height: 1;
  white-space: nowrap;
}
.bw-elite-tag .et-star {
  position: relative;
  width: 1.28em; height: 1.28em; min-width: 1.28em;
  display: inline-grid; place-items: center;
  border-radius: 999px;
  font-family: 'Heavyweight', 'Newsreader', serif;
  font-weight: 400; font-size: 0.9em; line-height: 1;
  color: var(--foil-warm); -webkit-text-fill-color: currentColor;
  background: linear-gradient(180deg, var(--elite-plate-top) 0%, var(--elite-plate-bot) 100%);
  border: 1px solid var(--foil-deep);
  box-shadow:
    inset 0 -1px 3px rgba(63,42,18,0.55),
    inset 0 1px 2px rgba(232,196,125,0.2),
    0 3px 10px -5px rgba(0,0,0,0.7);
  transform: rotate(-7deg);
  text-shadow: 0 0 6px rgba(232,196,125,0.38), 0 1px 0 rgba(0,0,0,0.75);
}
.bw-elite-tag .et-star::before {
  content: '';
  position: absolute; inset: 3px;
  border-radius: inherit;
  border: 1px solid rgba(232,196,125,0.34);
  pointer-events: none;
}
.bw-elite-tag .et-div {
  width: 1px; height: 0.86em; background: rgba(232,196,125,0.26); flex-shrink: 0;
}
.bw-elite-tag .et-word {
  font-family: 'Newsreader', 'Georgia', serif; font-style: italic; font-weight: 500;
  font-size: 1.03em; letter-spacing: 0.02em;
  background: linear-gradient(180deg, var(--foil-light) 0%, var(--foil-warm) 40%, var(--foil-mid) 75%, var(--foil-deep) 100%);
  -webkit-background-clip: text; background-clip: text;
  color: transparent; -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 1px 0 rgba(0,0,0,0.55));
}

/* ── iOS SAFARI GLOBAL ── */
html {
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
button, a, [onclick], [role="button"], .quiz-option, .battle-tab, .opener-choice,
.elim-card, .dt-opt, .nyha-step, .chunk, .flow-choice, .villain-card, .subpage-btn {
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
}
@supports (-webkit-touch-callout: none) {
  body { min-height: -webkit-fill-available; }
}

/* ── FONTS ── */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&display=swap');

/* ── DESIGN TOKENS ── */
:root {
  /* Base palette */
  --bg: #020617;
  --bg-card: #12121c;
  --bg-elevated: #15151f;
  --border: #2a2a3e;
  --border-subtle: #1e1a30;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  /* Primary accent (purple/pink) */
  --accent: #c084fc;
  --accent-dim: rgba(192, 132, 252, 0.15);
  --accent-border: rgba(192, 132, 252, 0.3);
  --purple: #a855f7;
  --pink: #ec4899;

  /* Secondary accents */
  --blue: #38bdf8;
  --orange: #f97316;
  --green: #22c55e;
  --teal: #14b8a6;

  /* Alias vars — used by subject index pages and older pages */
  --accent2: var(--purple);        /* purple alias for --accent2 */
  --muted: var(--text-muted);      /* muted text alias */
  --elevated: var(--bg-elevated);  /* elevated surface alias */

  /* Subject-specific accents (used by index pages) */
  --cardio-accent: #f43f5e;
  --neuro-accent: #818cf8;
  --biochem-accent: #a78bfa;
  --pharm-accent: #38bdf8;
  --endo-accent: #fb923c;
  --gi-accent: #4ade80;
  --renal-accent: #38bdf8;
  --resp-accent: #67e8f9;
  --heme-accent: #f87171;
  --micro-accent: #06b6d4;
  --immuno-accent: #e879f9;
  --msk-accent: #c084fc;
  --omm-accent: #c084fc;
  --derm-accent: #f472b6;
  --psych-accent: #d946ef;
  --peds-accent: #f59e0b;
  --path-accent: #ef4444;
  --biostats-accent: #94a3b8;
  --repro-accent: #f472b6;

  /* Card & layout */
  --card: #15151f;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);

  /* Transitions */
  --transition: 0.2s cubic-bezier(0.2, 0, 0, 1);
  --transition-slow: 0.4s cubic-bezier(0.2, 0, 0, 1);

  /* Gold foil — used by .page-nav-elite and .brand-pro */
  --foil-light: #fff6d0;
  --foil-warm:  #e8c47d;
  --foil-mid:   #c79850;
  --foil-deep:  #8a6230;
  --foil-shadow:#3f2a12;
  --elite-plate-top:#1a140a;
  --elite-plate-bot:#0d0903;
}

/* ── BASE ── */
body {
  font-family: 'Newsreader', sans-serif;
  background: #0a0a0f;
  color: #e0e0e8;
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── GPU ACCELERATION ── */
.sc-stage, .topic-card, .bg-blobs, .hero, .quiz-card {
  transform: translate3d(0,0,0);
  backface-visibility: hidden;
  will-change: transform;
}

/* ── AURORA CANVAS ── */
.bg-blobs {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

/* ── TOPIC CARDS v3 ── */
.topic-card {
  display: block;
  background: linear-gradient(150deg, #1f1a44 0%, #1a1638 100%);
  border: 1px solid rgba(192, 132, 252, 0.2);
  border-radius: 20px;
  padding: 24px;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
  text-decoration: none !important;
}

.topic-card:hover {
  border-color: rgba(192, 132, 252, 0.5);
  box-shadow: 0 12px 40px -12px rgba(192, 132, 252, 0.3);
}

.topic-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; width: 4px; height: 100%;
  background: linear-gradient(to bottom, var(--accent), var(--purple));
  opacity: 0;
  transition: opacity 0.2s;
}

.topic-card:hover::before { opacity: 1; }

a { color: #60a5fa; text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── FORM ELEMENT DEFAULTS (prevent black-on-black) ──
   Browser defaults render <input>, <textarea>, <select> as black text on
   white. On the BW dark theme that flashes white on focus and reads as
   "broken." Set sensible defaults that page-local styles can override. */
input, textarea, select, button {
  color: #e2e8f0;
  font-family: inherit;
  font-size: inherit;
}
input[type="text"], input[type="number"], input[type="email"],
input[type="password"], input[type="search"], input[type="tel"],
input[type="url"], textarea, select {
  background: #15151f;
  border: 1px solid #2a2a3e;
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 16px; /* iOS 16px floor — prevents focus zoom */
}
input::placeholder, textarea::placeholder { color: #64748b; }
input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: #c084fc;
  box-shadow: 0 0 0 3px rgba(192,132,252,0.18);
}
select option { color: #e2e8f0; background: #15151f; }

/* SVG <text> defaults to fill:black per spec → invisible on dark theme.
   Inherit the current text color unless the SVG explicitly sets fill. */
svg text:not([fill]):not(.no-inherit-fill) { fill: currentColor; }

/* ── TYPOGRAPHY ── */
h1, h2, h3, .section-title { font-family: 'Heavyweight', 'Space Grotesk', sans-serif; }

/* ── BACK LINK (LEGACY) ── */
/* Deprecated 2026-05-12. New pages use .page-nav breadcrumb below. */
.back-link {
  position: fixed; top: 16px; left: 16px; z-index: 100;
  color: #888; text-decoration: none; font-size: 0.85rem;
  transition: color 0.2s;
}
.back-link:hover { color: #fff; }

/* ── PAGE NAV (canonical breadcrumb, 2026-05-12) ──
   Usage:
     <body class="has-page-nav">
     <nav class="page-nav">
       <a href="/" class="page-nav-brand">
         <img src="/bw-logo-transparent-128.png" alt="Bone Wizardry" width="30" height="30" loading="eager">
         <span>Bone Wizardry</span>
       </a>
       <span class="page-nav-sep" aria-hidden="true"></span>
       <div class="page-nav-crumb">
         <a href="/{subject}/">{Subject}</a>
         <span class="crumb-sep" aria-hidden="true"></span>
         <span class="crumb-current">{Topic}</span>
       </div>
     </nav>
   The .has-page-nav body class reserves 68px top padding so the fixed bar
   never overlaps content. Modern browsers also handle this via :has(). */
body.has-page-nav { padding-top: 68px; }
body:has(.page-nav) { padding-top: 68px; }

.page-nav {
  position: fixed; top: 0; left: 0; right: 0; height: 64px;
  z-index: 200;
  display: flex; align-items: center; gap: 14px;
  padding: 0 20px;
  background: linear-gradient(180deg, rgba(10,10,15,0.94) 0%, rgba(10,10,15,0.82) 100%);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom: 1px solid rgba(192, 132, 252, 0.12);
  box-shadow: 0 1px 0 rgba(192,132,252,0.04), 0 8px 24px -16px rgba(0,0,0,0.6);
}
.page-nav-brand {
  display: flex; align-items: center; gap: 11px;
  font-family: 'Heavyweight', 'Space Grotesk', sans-serif;
  font-weight: 400; font-size: 0.92rem; color: #c084fc;
  letter-spacing: 0.22em; text-transform: uppercase;
  min-height: 44px; flex-shrink: 0;
  transition: color 0.25s, text-shadow 0.25s;
  text-shadow: 0 0 18px rgba(192,132,252,0.25);
}
.page-nav-brand:hover { color: #e9d5ff; text-shadow: 0 0 24px rgba(192,132,252,0.55); text-decoration: none; }
.page-nav-brand img {
  width: 30px; height: 30px; flex-shrink: 0;
  filter: drop-shadow(0 0 8px rgba(192,132,252,0.35));
}
.page-nav-brand span { display: inline; }
.page-nav-sep {
  display: inline-block; width: 1px; height: 22px;
  background: linear-gradient(180deg, transparent 0%, rgba(192,132,252,0.55) 50%, transparent 100%);
  flex-shrink: 0;
}
.page-nav-crumb {
  display: flex; align-items: center; gap: 10px;
  font-family: 'Heavyweight', 'Space Grotesk', sans-serif;
  font-weight: 400; font-size: 0.86rem;
  letter-spacing: 0.22em; text-transform: uppercase;
  min-height: 44px; overflow: hidden;
}
.page-nav-crumb a {
  color: #94a3b8; transition: color 0.25s, text-shadow 0.25s;
  white-space: nowrap; padding: 10px 2px; min-height: 44px;
  display: inline-flex; align-items: center;
}
.page-nav-crumb a:hover { color: #c084fc; text-shadow: 0 0 14px rgba(192,132,252,0.5); text-decoration: none; }
.crumb-sep {
  display: inline-block; width: 1px; height: 16px;
  background: linear-gradient(180deg, transparent, rgba(192,132,252,0.38), transparent);
  flex-shrink: 0;
}
.crumb-current {
  color: #f5e8ff;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  padding: 6px 12px;
  border: 1px solid rgba(192,132,252,0.28);
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(192,132,252,0.12) 0%, rgba(168,85,247,0.06) 100%);
  text-shadow: 0 0 16px rgba(192,132,252,0.45);
  min-width: 0; /* allow ellipsis inside flex */
}
/* Tablets — keep the full desktop layout, just tighten gaps + sizing
   so logo + brand + separator + subject + separator + topic chip
   all sit on ONE LINE. Topic chip truncates with ellipsis if needed. */
@media (max-width: 760px) {
  body.has-page-nav { padding-top: 56px; }
  body:has(.page-nav) { padding-top: 56px; }
  .page-nav { height: 52px; padding: 0 14px; gap: 11px; }
  .page-nav-brand { font-size: 0.72rem; gap: 9px; letter-spacing: 0.2em; }
  .page-nav-brand img { width: 26px; height: 26px; }
  .page-nav-sep { height: 20px; }
  .page-nav-crumb { font-size: 0.68rem; gap: 9px; letter-spacing: 0.16em; flex: 1; min-width: 0; }
  .page-nav-crumb a { padding: 6px 0; flex-shrink: 0; }
  .crumb-sep { height: 14px; }
  .crumb-current {
    padding: 5px 11px; font-size: 0.64rem;
    flex: 1; min-width: 0; max-width: 100%;
  }
}
/* Phones — drop the brand wordmark (logo still identifies us), keep
   the full crumb intact: subject pill + separator + current-topic chip.
   Matches the desktop visual language at small widths. */
@media (max-width: 480px) {
  .page-nav { padding: 0 12px; gap: 9px; }
  .page-nav-brand { gap: 0; }
  .page-nav-brand span { display: none; }
  .page-nav-brand img { width: 28px; height: 28px; }
  .page-nav-sep { display: inline-block; height: 22px; margin: 0 1px; }
  .page-nav-crumb { gap: 8px; font-size: 0.66rem; letter-spacing: 0.15em; }
  .page-nav-crumb a { padding: 5px 0; }
  .crumb-current { font-size: 0.62rem; padding: 5px 11px; }
}
/* Tiny phones — keep the separator + chip styling, just trim text more. */
@media (max-width: 360px) {
  .page-nav { padding: 0 10px; gap: 7px; }
  .page-nav-crumb { gap: 6px; font-size: 0.62rem; letter-spacing: 0.13em; }
  .crumb-current { font-size: 0.58rem; padding: 4px 10px; }
}

/* ── PAGE-NAV ELITE BADGE (top-right on pro pages) ── */
.page-nav-elite {
  margin-left: auto;
  display: inline-flex; align-items: center; gap: 0.36rem;
  flex-shrink: 0;
  font-size: 0.7rem;
  letter-spacing: 0.03em;
  opacity: 0.92;
  line-height: 1;
}
.page-nav-elite .pne-star {
  position: relative;
  width: 1.35em; height: 1.35em; min-width: 1.35em;
  display: inline-grid; place-items: center;
  border-radius: 999px;
  font-family: 'Heavyweight', 'Newsreader', serif; font-weight: 400;
  font-size: 0.9em; line-height: 1;
  color: var(--foil-warm); -webkit-text-fill-color: currentColor;
  background: linear-gradient(180deg, var(--elite-plate-top) 0%, var(--elite-plate-bot) 100%);
  border: 1px solid var(--foil-deep);
  box-shadow:
    inset 0 -1px 4px rgba(63,42,18,0.55),
    inset 0 1px 2px rgba(232,196,125,0.22),
    0 3px 11px -5px rgba(0,0,0,0.72);
  transform: rotate(-7deg);
  text-shadow: 0 0 6px rgba(232,196,125,0.38), 0 1px 0 rgba(0,0,0,0.75);
}
.page-nav-elite .pne-star::before {
  content: '';
  position: absolute; inset: 3px;
  border-radius: inherit;
  border: 1px solid rgba(232,196,125,0.34);
  pointer-events: none;
}
.page-nav-elite .pne-div {
  width: 1px; height: 0.9em;
  background: rgba(232,196,125,0.28);
  flex-shrink: 0;
}
.page-nav-elite .pne-word {
  font-family: 'Newsreader', 'Georgia', serif; font-style: italic; font-weight: 500;
  font-size: 1em; letter-spacing: 0.04em;
  background: linear-gradient(180deg,
    var(--foil-light) 0%, var(--foil-warm) 40%,
    var(--foil-mid) 75%, var(--foil-deep) 100%);
  -webkit-background-clip: text; background-clip: text;
  color: transparent; -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 1px 0 rgba(0,0,0,0.5));
}
@media (max-width: 480px) {
  .page-nav-elite { font-size: 0.62rem; gap: 0.3rem; }
}

/* ── HERO (full-screen opener) ── */
.hero {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 40px 20px; text-align: center;
  background: radial-gradient(ellipse at center, #1a1028 0%, #0a0a0f 70%);
}

.hero h1 {
  font-family: 'Heavyweight', 'Space Grotesk', sans-serif;
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 400;
  background: linear-gradient(135deg, #ff6b9d, #c084fc, #60a5fa);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
}

.hero .subtitle {
  color: #a0a0b8; font-size: 1.1rem;
  max-width: 600px; margin-bottom: 40px; line-height: 1.6;
}

/* ── OPENER (clinical vignette) ── */
.opener {
  background: #15151f;
  border: 1px solid #2a2a3e;
  border-radius: 16px;
  padding: 32px;
  max-width: 600px; width: 100%;
  text-align: left;
}

.opener .patient {
  font-size: 1rem; line-height: 1.7; color: #c8c8d8; margin-bottom: 24px;
}
.opener .patient strong { color: #ff6b9d; }

.opener-choices {
  display: flex; flex-direction: column; gap: 10px;
}

.opener-choice {
  padding: 14px 18px;
  background: #1a1a2e; border: 1px solid #2a2a3e; border-radius: 10px;
  color: #c8c8d8; cursor: pointer; transition: all 0.2s; font-size: 0.95rem;
}
.opener-choice:hover { border-color: #c084fc; background: #1e1a30; }
.opener-choice.correct { border-color: #4ade80; background: #0f2a1a; color: #4ade80; }
.opener-choice.wrong { border-color: #f87171; background: #2a0f0f; color: #f87171; }

.opener-explanation {
  margin-top: 16px; padding: 16px;
  background: #1a1a2e; border-radius: 10px;
  font-size: 0.9rem; line-height: 1.6;
  display: none; color: #b8b8c8;
}
.opener-explanation.show { display: block; }
.opener-explanation .key-fact { color: #c084fc; font-weight: 600; }

/* ── SECTIONS ── */
.section {
  max-width: 900px; margin: 0 auto; padding: 60px 20px;
}
.section-title {
  font-family: 'Heavyweight', 'Space Grotesk', sans-serif;
  font-size: 1.8rem; font-weight: 400; margin-bottom: 8px;
}
.section-desc {
  color: #888; margin-bottom: 32px; font-size: 0.95rem;
}

/* ── CARDS / PANELS ── */
.card-panel {
  background: #12121c;
  border: 1px solid #2a2a3e;
  border-radius: 16px;
  padding: 28px;
}

.card-field {
  background: #1a1a28; border-radius: 10px; padding: 14px;
}
.card-field .label {
  font-size: 0.75rem; text-transform: uppercase;
  letter-spacing: 0.08em; color: #666;
  margin-bottom: 6px; font-weight: 600;
}
.card-field .value { font-size: 0.95rem; line-height: 1.5; }

.card-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
}
@media (max-width: 600px) { .card-grid { grid-template-columns: 1fr; } }

/* ── BATTLE TABS (disease/topic switcher) ── */
.battle-nav {
  display: flex; gap: 8px; margin-bottom: 14px;
  flex-wrap: wrap; justify-content: center;
}
.battle-tab {
  padding: 10px 18px; border-radius: 20px;
  border: 1px solid #333; background: #15151f;
  color: #999; cursor: pointer; transition: all 0.3s;
  font-size: 0.85rem; font-weight: 600;
  -webkit-user-select: none; user-select: none;
}
.battle-tab.active {
  border-color: var(--accent, #c084fc);
  background: #1e1a30;
  background: color-mix(in srgb, var(--accent, #c084fc) 15%, #15151f);
  color: var(--accent, #c084fc);
}

.battle-card {
  display: none; background: #12121c;
  border: 1px solid #2a2a3e; border-radius: 16px;
  padding: 20px;
  animation: fadeIn 0.3s ease;
}
.battle-card.active { display: block; }

/* ── QUIZ OPTIONS ── */
.quiz-option {
  padding: 14px 18px;
  background: #1a1a2e; border: 1px solid #2a2a3e; border-radius: 10px;
  color: #c8c8d8; cursor: pointer; transition: all 0.2s; font-size: 0.9rem;
  display: block; width: 100%; text-align: left;
  font-family: inherit; margin-bottom: 8px;
}
.quiz-option:hover { border-color: #c084fc; background: #1e1a30; }
.quiz-option.correct { border-color: #4ade80; background: #0f2a1a; color: #4ade80; pointer-events: none; }
.quiz-option.wrong { border-color: #f87171; background: #2a0f0f; color: #f87171; pointer-events: none; }
.quiz-option.disabled { pointer-events: none; opacity: 0.5; }

/* ── FEEDBACK ── */
.feedback {
  margin-top: 16px; padding: 16px; border-radius: 10px;
  font-size: 0.9rem; line-height: 1.6; display: none;
}
.feedback.show { display: block; }
.feedback-correct { background: #0f2a1a; border: 1px solid #22c55e33; color: #bbf7d0; }
.feedback-wrong { background: #2a0f0f; border: 1px solid #ef444433; color: #fecaca; }

/* ── KEY FACTS & BOARD TRAPS ── */
.key-fact {
  background: #1a1a28; border-left: 3px solid #c084fc;
  padding: 14px 18px; margin: 16px 0; border-radius: 0 10px 10px 0;
  font-size: 0.9rem; line-height: 1.6;
}

.board-trap {
  background: #1a1418; border-left: 3px solid #f87171;
  padding: 14px 18px; margin: 16px 0; border-radius: 0 10px 10px 0;
  font-size: 0.9rem; line-height: 1.6; color: #fecaca;
}
.board-trap strong { color: #f87171; }

/* ── HIGHLIGHTS ── */
.hl-yellow { color: #fde047; font-weight: 700; }
.hl-red { color: #f87171; font-weight: 700; }
.hl-green { color: #86efac; font-weight: 700; }
.hl-blue { color: #93c5fd; font-weight: 700; }
.hl-purple { color: #c084fc; font-weight: 700; }
.hl-pink { color: #ff6b9d; font-weight: 700; }

/* ── TOOLTIPS ── */
.tip {
  position: relative; text-decoration: underline dotted #60a5fa;
  cursor: help; color: #93c5fd;
}
.tip .tip-text {
  display: none; position: absolute; bottom: 125%; left: 50%;
  transform: translateX(-50%);
  background: #1a1a2e; color: #c8c8d8;
  padding: 10px 14px; border-radius: 10px;
  font-size: 0.8rem; width: max-content; max-width: 280px;
  z-index: 9999; border: 1px solid #2a2a3e;
  line-height: 1.5; box-shadow: 0 8px 24px #0006;
}
.tip .tip-text::after {
  content: ''; position: absolute; top: 100%; left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent; border-top-color: #2a2a3e;
}
.tip.active .tip-text { display: block; }
.tip.active .tip-text[style*="fixed"] { position: fixed; }
.tip.active .tip-text[style*="fixed"]::after { display: none; }
@media (max-width: 600px) {
  .tip.active .tip-text {
    position: fixed; bottom: 0; left: 0; right: 0; top: auto;
    transform: none; max-width: none; width: 100%;
    border-radius: 16px 16px 0 0; padding: 20px 20px calc(20px + env(safe-area-inset-bottom, 0px));
    font-size: 0.85rem; z-index: 9998;
    box-shadow: 0 -8px 40px #000a;
    animation: tipSlideUp 0.2s ease;
  }
  .tip.active .tip-text::after { display: none; }
  .tip .tip-text { left: auto; right: 0; transform: none; max-width: 240px; }
  .tip .tip-text::after { left: auto; right: 1rem; }
}
@keyframes tipSlideUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

/* ── LABELS / TAGS ── */
.tag {
  font-family: 'Newsreader', Georgia, serif;
  display: inline-block; font-size: 0.7rem; font-weight: 700;
  padding: 3px 10px; border-radius: 20px;
}

/* ── CANONICAL CLASSIFICATION PILLS - from Pill Redesigns.html ── */
.bw-pill-strip {
  display: flex; align-items: center; flex-wrap: wrap; gap: 0;
  max-width: 100%;
}
.bw-pill-lead {
  display: inline-flex; align-items: center; gap: 7px;
  margin-right: 12px; padding: 6px 12px;
  border-radius: 6px;
  font-family: 'Newsreader', Georgia, serif;
  font-size: 0.66rem; font-weight: 700;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: #d8b4fe;
  background: rgba(168,85,247,0.08);
  box-shadow: inset 0 0 0 1px rgba(168,85,247,0.33);
}
.bw-pill-lead::before {
  content: '';
  width: 7px; height: 7px; border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 8px currentColor;
}
.bw-pill-lead.gp,
.bw-pill-lead.gram-positive { color: #fda4af; background: rgba(244,63,94,0.08); box-shadow: inset 0 0 0 1px rgba(244,63,94,0.33); }
.bw-pill-lead.gn,
.bw-pill-lead.gram-negative { color: #7dd3fc; background: rgba(56,189,248,0.08); box-shadow: inset 0 0 0 1px rgba(56,189,248,0.33); }
.bw-pill-lead.af,
.bw-pill-lead.acid-fast { color: #fb923c; background: rgba(251,146,60,0.08); box-shadow: inset 0 0 0 1px rgba(251,146,60,0.33); }
.bw-pill-attr {
  display: inline-flex; align-items: center;
  padding: 4px 2px;
  font-family: 'Newsreader', Georgia, serif;
  font-size: 0.82rem; font-weight: 600;
  color: #cbd5e1; letter-spacing: 0.01em;
}
.bw-pill-attr.shape,
.bw-pill-attr.morph { color: #e2e8f0; font-weight: 700; }
.bw-pill-dot {
  width: 3px; height: 3px; border-radius: 50%;
  background: #475569; margin: 0 8px; flex: 0 0 auto;
}

/* ── SILHOUETTE BULLETS (authored page-content lists; NO glowing dots) ── */
.bw-silhouette-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.55rem; }
.bw-silhouette-list > * { position: relative; padding-left: 1.35rem; }
.bw-silhouette-list > *::before {
  content: ''; position: absolute; left: 0; top: 0.42em;
  width: 8px; height: 8px;
  background: var(--sil-color, #c4b5fd);
  -webkit-mask: url(/bw-avatar.svg) center / contain no-repeat;
  mask: url(/bw-avatar.svg) center / contain no-repeat;
}
.bw-silhouette-bullet {
  display: inline-block; width: 8px; height: 8px; vertical-align: -1px; flex: 0 0 auto;
  background: var(--sil-color, #c4b5fd);
  -webkit-mask: url(/bw-avatar.svg) center / contain no-repeat;
  mask: url(/bw-avatar.svg) center / contain no-repeat;
}

.bw-taxonomy-path,
.bw-class-path {
  display: inline-flex; align-items: stretch;
  max-width: 100%;
  border-radius: 999px;
  background: #0f0f1a;
  border: 1px solid #2a2640;
  overflow-x: auto; overflow-y: hidden;
  padding: 2px;
  vertical-align: middle;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.03), 0 1px 0 rgba(0,0,0,0.55);
  scrollbar-width: none;
}
.bw-taxonomy-path::-webkit-scrollbar,
.bw-class-path::-webkit-scrollbar { display: none; }
.bw-taxonomy-path .tax-step,
.bw-class-path .tax-step {
  display: inline-flex; align-items: center; gap: 8px;
  flex: 0 0 auto;
  padding: 6px 14px;
  font-family: 'Newsreader', Georgia, serif;
  font-size: 0.66rem; font-weight: 700;
  letter-spacing: 0.11em; text-transform: uppercase;
  color: #cbd5e1; white-space: nowrap;
}
.bw-taxonomy-path .tax-step + .tax-step::before,
.bw-class-path .tax-step + .tax-step::before {
  content: '>';
  color: #475569; font-weight: 400; font-size: 0.8rem;
  margin-right: 8px; margin-left: -4px;
}
.bw-taxonomy-path .tax-step.root,
.bw-class-path .tax-step.root {
  border-radius: 999px;
  padding-left: 16px;
  background: rgba(168,85,247,0.08);
  color: #d8b4fe;
}
.bw-taxonomy-path .tax-step.root::after,
.bw-class-path .tax-step.root::after {
  content: '';
  width: 6px; height: 6px; border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 8px currentColor;
  margin-left: 4px; margin-right: -2px;
}
.bw-taxonomy-path .tax-step.root.gp,
.bw-taxonomy-path .tax-step.root.gram-positive,
.bw-class-path .tax-step.root.gp,
.bw-class-path .tax-step.root.gram-positive { color: #fda4af; background: rgba(244,63,94,0.08); }
.bw-taxonomy-path .tax-step.root.gn,
.bw-taxonomy-path .tax-step.root.gram-negative,
.bw-class-path .tax-step.root.gn,
.bw-class-path .tax-step.root.gram-negative { color: #7dd3fc; background: rgba(56,189,248,0.08); }
.bw-taxonomy-path .tax-step.root.af,
.bw-taxonomy-path .tax-step.root.acid-fast,
.bw-class-path .tax-step.root.af,
.bw-class-path .tax-step.root.acid-fast { color: #fb923c; background: rgba(251,146,60,0.08); }
.bw-taxonomy-path .tax-step.shape,
.bw-taxonomy-path .tax-step.morph,
.bw-class-path .tax-step.shape,
.bw-class-path .tax-step.morph { color: #e2e8f0; }
.bw-taxonomy-path .tax-step.attr,
.bw-taxonomy-path .tax-step.feature,
.bw-class-path .tax-step.attr,
.bw-class-path .tax-step.feature { color: #fb923c; }

.bw-free-tag {
  position: relative;
  display: inline-flex; align-items: center;
  padding: 0.15rem 0.58rem 0.18rem;
  font-family: 'Newsreader', Georgia, serif;
  font-size: 0.86rem; font-style: italic; font-weight: 500;
  color: #e9d5ff; letter-spacing: 0.005em;
  line-height: 1;
}
.bw-free-tag::before,
.bw-free-tag::after {
  content: '';
  position: absolute; top: 0; bottom: 0;
  width: 6px;
  border: 1px solid rgba(233,213,255,0.42);
}
.bw-free-tag::before { left: 0; border-right: 0; }
.bw-free-tag::after { right: 0; border-left: 0; }

@media (max-width: 600px) {
  .bw-taxonomy-path,
  .bw-class-path { width: 100%; border-radius: 12px; }
  .bw-taxonomy-path .tax-step,
  .bw-class-path .tax-step { padding: 6px 10px; font-size: 0.6rem; letter-spacing: 0.08em; }
  .bw-pill-lead { margin-right: 9px; font-size: 0.6rem; padding: 6px 10px; }
  .bw-pill-attr { font-size: 0.78rem; }
}

/* ── ANIMATION ── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── FOOTER ── */
.footer {
  text-align: center; color: #444; font-size: 0.75rem;
  padding: 40px 20px; letter-spacing: 0.05em;
}

/* ── NAV BREADCRUMB ── */
.nav {
  padding: 1rem; display: flex; gap: 0.75rem;
  align-items: center; font-size: 0.8rem;
  border-bottom: 1px solid #1a1a2e; flex-wrap: wrap;
}
.nav a { color: #888; }
.nav a:hover { color: #e0e0e8; text-decoration: none; }
.nav .sep { color: #333; }

/* ── RESPONSIVE ── */
@media (max-width: 600px) {
  .hero h1 { font-size: 1.8rem; }
  .opener { padding: 20px; }
  .section { padding: 40px 16px; }
  .section-title { font-size: 1.5rem; }
  .battle-card { padding: 20px; }
  .card-grid { grid-template-columns: 1fr; }
  .quiz-option { font-size: 0.85rem; padding: 14px 16px; min-height: 44px; }
  .tip .tip-text { font-size: 0.8rem; max-width: 240px; }
  .opener-choice { min-height: 44px; font-size: 0.9rem; }
  .key-fact { font-size: 0.85rem; }
  .board-trap { font-size: 0.85rem; }
  .back-link { font-size: 0.875rem; top: 10px; left: 12px; max-width: 45%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; padding: 12px 12px; min-height: 44px; display: inline-flex; align-items: center; }
  .subpage-section-label { display: none !important; font-size: 0.8125rem; }

  .page-section { padding: 1.1rem 1rem 1.15rem; padding-bottom: 5rem; }
  .subpage-counter { display: none; }
  .subpage-nav {
    margin-top: 1.25rem; padding-top: 0.75rem;
    position: sticky; bottom: 0; z-index: 50;
    background: #0a0a0f;
    padding-bottom: calc(0.75rem + env(safe-area-inset-bottom, 0px));
    border-top: 1px solid rgba(255,255,255,0.06);
  }
  .card-panel { padding: 20px 16px; }
  .battle-card { padding: 20px 16px; }
  .card-field { padding: 12px; }
  .feedback { font-size: 0.85rem; padding: 14px; }
  .content-block, .teach-card { font-size: 0.9rem; line-height: 1.75; }

  .lightbox-close, .lb-close, .close-btn { min-width: 44px; min-height: 44px; display: inline-flex; align-items: center; justify-content: center; }
  .signin-float { min-height: 44px; min-width: 44px; padding: 12px 16px; }
  .nav-btn, .subpage-btn, .nephron-btn, .enzyme-viz-btn, .screen-tab, .pattern-tab, .scenario-btn, .organ-btn, .panel-btn, .cascade-btn, .reset-btn, .step-opt, .category-btn, .level-tab, .tremor-btn, .hook, .drag-chip, .subject-btn, .level-btn, .control-btn { min-height: 44px; padding: 10px 14px; }
  .subpage-dot { min-width: 28px; min-height: 28px; padding: 8px; position: relative; }
  .subpage-dot::after { content: ''; position: absolute; inset: -8px; }

  /* Inline tooltip triggers: keep inline layout but extend tap area via pseudo-element */
  .tip, .mem-hook { position: relative; padding: 2px 4px; }
  .tip::before, .mem-hook::before {
    content: ''; position: absolute; inset: -10px -4px; z-index: 1;
  }

  /* Mobile table stack: rows become cards, columns stack vertically.
     !important needed to override page-level inline .mini-table / .compare-table etc. */
  table thead, table th { display: none !important; }
  table tr:first-child:has(th) { display: none !important; padding: 0 !important; margin: 0 !important; border: none !important; }
  table, table tbody, table tr, table td {
    display: block !important; width: 100% !important;
  }
  table { border-collapse: separate !important; border-spacing: 0 !important; }
  table tr {
    padding: 0.75rem !important; margin-bottom: 0.75rem !important; border-radius: 10px !important;
    background: #15151f !important; border: 1px solid #1e293b !important;
  }
  table td {
    padding: 0.2rem 0 !important; border-bottom: none !important; font-size: 0.85rem !important;
  }
  table td:first-child { color: #a78bfa !important; font-weight: 700 !important; margin-bottom: 0.2rem; }
  table td:last-child { font-size: 0.78rem !important; color: #94a3b8 !important; margin-top: 0.15rem; }
  .cs-label { font-size: 0.75rem; }
  .cs-subj { font-size: 0.65rem; }
  .hero-sub { font-size: 0.8125rem; }
  .villain-tagline { font-size: 0.8125rem; }
  .villain-facts li { font-size: 0.8125rem; }
  .villain-hint { font-size: 0.8125rem; }
  .dt-node { font-size: 0.8125rem; }
  .dt-leaf { font-size: 0.8125rem; min-height: 44px; }
  .dt-opt { font-size: 0.875rem; min-height: 44px; padding: 0.8rem 1rem; }
  .dt-terminal { font-size: 0.8125rem; }
  .quiz-num, .quiz-counter { font-size: 0.8125rem; }
  .reset-btn { font-size: 0.875rem; }
  .card-photo-label { font-size: 0.875rem; }
  .battle-tab { min-height: 44px; }
  .match-option { min-height: 44px; padding: 0.75rem 1rem; }
  .match-antibody { min-height: 44px; }

  /* Systemic mobile fixes: strip arrows, photo strip overflow, lightbox close, small text */
  .strip-arrow, .anat-arrow, .strip-btn { min-width: 44px; min-height: 44px; display: inline-flex; align-items: center; justify-content: center; }
  .card-photo-strip, .photo-strip, .photo-strip-row { overflow-x: auto; -webkit-overflow-scrolling: touch; max-width: 100%; }
  .card-photo-strip img, .photo-strip img { max-width: none; height: auto; }
  .hero-eyebrow, [class*="eyebrow"] { font-size: max(0.8125rem, 13px) !important; }
  .section-label, .subpage-section-label { font-size: max(0.8125rem, 13px) !important; }
  .photo-strip-label, .card-photo-label { font-size: max(0.8125rem, 13px) !important; }
  .crumb-current { font-size: max(0.75rem, 12px) !important; }
  .wt-badge { font-size: max(0.75rem, 12px) !important; }
  .reveal-tag, .reveal-field-label { font-size: max(0.75rem, 12px) !important; }
}

@media (max-width: 480px) {
  .hero { min-height: auto; padding: 56px 16px 40px; }
  .hero .subtitle { font-size: 0.95rem; margin-bottom: 28px; }
  .section { padding: 32px 16px; }

  /* Battle tabs + any tab row: horizontal scroll instead of wrapping */
  .battle-nav, .pv-tabs, .scolio-tabs, .pv-tabs-wrap {
    justify-content: flex-start;
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    margin-left: -16px;
    margin-right: -16px;
    padding-left: 16px;
    padding-right: 16px;
  }
  .battle-nav::-webkit-scrollbar, .pv-tabs::-webkit-scrollbar, .scolio-tabs::-webkit-scrollbar, .pv-tabs-wrap::-webkit-scrollbar { display: none; }
  .battle-tab, .pv-tab, .scolio-tab { flex-shrink: 0; }

  /* Antibody match: stack vertically on small screens */
  .match-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
  .match-antibody { width: 100%; min-width: 0; text-align: left; }
  .match-arrow { transform: rotate(90deg); align-self: center; }
  .match-options { width: 100%; flex-wrap: wrap; }
}

/* ── PAGE SECTIONS ── */
.page-section { display: none; padding: 1.35rem 1.25rem 1.25rem; }
.page-section.active { display: block; }

/* ── SUBPAGE NAV (chunk-to-chunk prev/next) ── */
.subpage-progress {
  position: fixed; top: 0; left: 0; right: 0; height: 3px;
  background: rgba(255,255,255,0.06); z-index: 200;
}
.subpage-progress-bar {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, #c084fc, #60a5fa);
  transition: width 0.4s ease;
}
.subpage-section-label {
  display: none !important;
}
.subpage-nav {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 1rem; padding-top: 0.65rem;
  border-top: 1px solid rgba(255,255,255,0.06);
  gap: 0.75rem;
}
.subpage-btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.6rem 1.1rem; border-radius: 0.6rem; border: 1px solid #333;
  background: rgba(255,255,255,0.04); color: #888;
  font-size: 0.78rem; font-weight: 600; font-family: inherit;
  cursor: pointer; min-height: 44px;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.subpage-btn:hover { border-color: #c084fc; color: #c084fc; background: rgba(192,132,252,0.06); }
.subpage-btn.sp-prev::before,
.subpage-btn.sp-next::after {
  content: '';
  width: 1.15rem;
  height: 0.72rem;
  display: inline-block;
  background:
    linear-gradient(135deg, rgba(255,255,255,0.95), rgba(192,132,252,0.95) 58%, rgba(96,165,250,0.9));
  clip-path: polygon(0 50%, 38% 0, 38% 28%, 100% 28%, 100% 72%, 38% 72%, 38% 100%);
  filter:
    drop-shadow(0 0 4px rgba(192,132,252,0.55))
    drop-shadow(0 0 10px rgba(96,165,250,0.22));
  transform-origin: center;
  transition: transform 0.2s ease, filter 0.2s ease;
}
.subpage-btn.sp-next::after { transform: scaleX(-1); }
.subpage-btn.sp-prev:hover::before {
  transform: translateX(-2px) scale(1.08);
  filter:
    drop-shadow(0 0 5px rgba(192,132,252,0.75))
    drop-shadow(0 0 14px rgba(96,165,250,0.3));
}
.subpage-btn.sp-next:hover::after {
  transform: translateX(2px) scaleX(-1) scale(1.08);
  filter:
    drop-shadow(0 0 5px rgba(192,132,252,0.75))
    drop-shadow(0 0 14px rgba(96,165,250,0.3));
}
.subpage-counter { display: none; }
.subpage-btn.sp-at-edge { opacity: 0.3; cursor: not-allowed; }

/* ── iOS SAFE AREA ── */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
  .footer { padding-bottom: calc(40px + env(safe-area-inset-bottom)); }
  .subpage-nav { padding-bottom: calc(1rem + env(safe-area-inset-bottom)); }
}

/* ── SCROLL PROGRESS ── */
.scroll-progress-bar {
  position: fixed; top: 0; left: 0; height: 3px; width: 0%;
  background: linear-gradient(90deg, #c084fc, #60a5fa);
  z-index: 9999; pointer-events: none;
  transition: width 0.1s linear;
}

/* ── CONTINUE STUDYING ── */
.continue-studying {
  max-width: 900px; margin: 2.5rem auto 0; padding: 2rem 20px 0;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.cs-label {
  font-family: 'Heavyweight', 'Space Grotesk', sans-serif;
  font-size: 0.7rem; font-weight: 400; color: #888;
  letter-spacing: 0.25em; text-transform: uppercase; margin-bottom: 1rem;
}
.cs-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px; margin-bottom: 28px;
}
.cs-card {
  display: flex; flex-direction: column; gap: 6px;
  padding: 18px 16px; border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.06);
  background: #12121c; /* fallback */
  background: linear-gradient(160deg, #14141f 0%, #10101a 100%);
  text-decoration: none; position: relative; overflow: hidden;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}
.cs-card::after {
  content: '\2192'; position: absolute; right: 14px; top: 50%;
  transform: translateY(-50%); color: #444; font-size: 1rem;
  transition: color 0.25s, transform 0.25s;
}
.cs-card:hover {
  border-color: rgba(192,132,252,0.35);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(192,132,252,0.08);
  text-decoration: none;
}
.cs-card:hover::after { color: #c084fc; transform: translateY(-50%) translateX(3px); }
.cs-subj {
  font-family: 'Heavyweight', 'Space Grotesk', sans-serif;
  font-size: 0.6rem; font-weight: 400; letter-spacing: 0.12em;
  color: #c084fc; text-transform: uppercase;
}
.cs-title { font-size: 0.9rem; font-weight: 600; color: #e0e0e8; padding-right: 1.5rem; }
.cs-cross { border-color: rgba(96,165,250,0.12); }
.cs-cross .cs-subj { color: #60a5fa; }
.cs-cross:hover { border-color: rgba(96,165,250,0.35); box-shadow: 0 6px 24px rgba(96,165,250,0.08); }
.cs-cross:hover::after { color: #60a5fa; }
@media (max-width: 600px) {
  .cs-grid { grid-template-columns: 1fr; }
}

/* ── OVERSCROLL ── */
.photo-lightbox, .search-overlay { overscroll-behavior: contain; }

/* ── TOPNAV BRAND LOGO ── */
.topnav-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.topnav-brand:hover { text-decoration: none; }
.topnav-logo {
  width: 28px;
  height: 28px;
  display: block;
  filter: drop-shadow(0 1px 4px rgba(124, 58, 237, 0.45));
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  image-rendering: -webkit-optimize-contrast;
}
.topnav-brand:hover .topnav-logo { transform: rotate(-6deg) scale(1.05); }
@media (max-width: 600px) {
  .topnav-logo { width: 24px; height: 24px; }
  .topnav-brand { gap: 8px; }
}

/* ── FOOTER BRAND LOGO ── */
.footer-logo {
  width: 56px;
  height: 56px;
  display: block;
  margin-bottom: 12px;
  filter: drop-shadow(0 2px 10px rgba(124, 58, 237, 0.4));
  image-rendering: -webkit-optimize-contrast;
}

/* ── ANIMATED BLOB BACKGROUND (subject index pages) ──
   Usage: <div class="bg-blobs"><div class="blob blob-1"></div>...</div>
   Override size/color per page for accent-matched blobs. */
.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  will-change: transform;
}
.blob-1 {
  width: 600px; height: 600px;
  top: -150px; left: -150px;
  background: radial-gradient(circle, rgba(168,85,247,0.45) 0%, transparent 70%);
  animation: bdrift1 22s ease-in-out infinite;
}
.blob-2 {
  width: 500px; height: 500px;
  bottom: -100px; right: -100px;
  background: radial-gradient(circle, rgba(236,72,153,0.35) 0%, transparent 70%);
  animation: bdrift2 28s ease-in-out infinite;
}
.blob-3 {
  width: 400px; height: 400px;
  top: 40%; left: 50%;
  background: radial-gradient(circle, rgba(56,189,248,0.25) 0%, transparent 70%);
  animation: bdrift3 18s ease-in-out infinite;
}
@keyframes bdrift1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(160px, 100px) scale(1.1); }
  66% { transform: translate(-60px, 180px) scale(0.9); }
}
@keyframes bdrift2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  40% { transform: translate(-180px, -120px) scale(1.15); }
  70% { transform: translate(-40px, -240px) scale(0.88); }
}
@keyframes bdrift3 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  30% { transform: translate(-140px, 80px) scale(1.08); }
  60% { transform: translate(100px, -160px) scale(0.92); }
}
@media (max-width: 600px) {
  .blob-1 { width: 380px; height: 380px; }
  .blob-2 { width: 320px; height: 320px; }
  .blob-3 { width: 260px; height: 260px; }
}

/* INTERACTIVE GAME ENGINE
   Interactive cinematic game shell used across BW deep-dive pages.
   Full reference + data format: BW interactive reference.
   JS engine: shared interaction script.

   Series theme overrides - add per-disease modifier classes:
     .sc-game.theme-furnace { --sc-accent: #fb923c; --sc-bg: #160707; ... }
   Rule: two vignettes MUST NOT share a palette. Color IS the memory hook. */
.sc-game {
  --sc-bg: #0a0612;
  --sc-accent: #f0abfc;
  --sc-accent-glow: rgba(192,132,252,0.55);
  --sc-text: #c4b5fd;
  --sc-text-bright: #e9d5ff;
  --sc-dim: #6b5b8b;
  --sc-correct: #22c55e;
  --sc-wrong: #ef4444;
  /* Bloom/stripe vars — override per theme modifier class */
  --sc-bloom1: rgba(168,85,247,0.18);
  --sc-bloom2: rgba(240,171,252,0.12);
  --sc-bloom3: rgba(168,85,247,0.10);
  --sc-bloom4: rgba(240,171,252,0.14);
  --sc-stripe: rgba(168,85,247,0.025);
  position: relative;
  max-width: 500px; width: 100%; margin: 0 auto;
  border-radius: 1rem; overflow: hidden;
  background:
    radial-gradient(ellipse 380px 280px at 50% 30%, var(--sc-bloom1) 0%, rgba(10,6,18,0.04) 50%, transparent 100%),
    repeating-linear-gradient(45deg, transparent, transparent 28px, var(--sc-stripe) 28px, var(--sc-stripe) 29px),
    var(--sc-bg);
  box-shadow: inset 60px 0 80px -20px #000, inset -60px 0 80px -20px #000, inset 0 40px 60px -30px #000;
  border: 1px solid #1e1230;
  color: var(--sc-text);
}
.sc-game::before {
  content: ''; position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    radial-gradient(circle at 20% 30%, var(--sc-bloom1) 1px, transparent 2px),
    radial-gradient(circle at 70% 50%, var(--sc-bloom2) 1px, transparent 2px),
    radial-gradient(circle at 40% 70%, var(--sc-bloom3) 1px, transparent 2px),
    radial-gradient(circle at 85% 20%, var(--sc-bloom4) 1px, transparent 2px);
  background-size: 200px 200px, 280px 280px, 240px 240px, 320px 320px;
  animation: sc-drift 22s linear infinite;
  opacity: 0.6;
}
@keyframes sc-drift { from { transform: translate(0,0); } to { transform: translate(-40px,-40px); } }

.sc-inner { position: relative; z-index: 2; padding: 1.4rem 1.1rem 1.6rem; }

.sc-progress { display: flex; gap: 5px; justify-content: center; margin-bottom: 1.4rem; }
.sc-pdot { width: 22px; height: 3px; border-radius: 2px; background: rgba(168,85,247,0.16); transition: all 0.4s; }
.sc-pdot.active { background: var(--sc-text-bright); box-shadow: 0 0 12px var(--sc-accent-glow); }
.sc-pdot.done.correct { background: rgba(34,197,94,0.7); }
.sc-pdot.done.wrong { background: rgba(239,68,68,0.7); }

.sc-stage { display: none; }
.sc-stage.sc-on { display: block; animation: sc-fadein 0.5s ease; }
.sc-stage.active { display: flex; flex-direction: column; align-items: center; justify-content: center; animation: sc-fadein 0.5s ease; }
@keyframes sc-fadein { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

.sc-eyebrow {
  font-family: 'Heavyweight', 'Newsreader', Georgia, serif;
  font-size: 0.6rem; letter-spacing: 0.32em; color: var(--sc-dim);
  text-transform: uppercase; text-align: center; margin-bottom: 0.75rem;
}
.sc-name {
  font-family: 'Heavyweight', 'Space Grotesk', sans-serif;
  font-size: 2rem; font-weight: 400; letter-spacing: 0.18em;
  color: var(--sc-text-bright); text-align: center;
  text-shadow: 0 0 30px var(--sc-accent-glow);
  margin-bottom: 0.3rem;
}
.sc-subline {
  text-align: center; color: var(--sc-text);
  font-family: 'Newsreader', Georgia, serif; font-size: 0.78rem;
  letter-spacing: 0.2em; margin-bottom: 1rem;
}
.sc-prose {
  text-align: center; color: var(--sc-text);
  font-size: 0.92rem; line-height: 1.55; max-width: 380px;
  margin: 0 auto 1.4rem; font-style: italic;
}
.sc-prompt {
  text-align: center;
  font-family: 'Heavyweight', 'Space Grotesk', sans-serif;
  font-size: 0.95rem; font-weight: 400; letter-spacing: 0.22em;
  color: var(--sc-text-bright); text-transform: uppercase;
  margin-bottom: 1rem;
  text-shadow: 0 0 18px var(--sc-accent-glow);
}
.sc-status {
  text-align: center; min-height: 3.4rem;
  padding: 0.75rem 0.9rem; border-radius: 0.8rem;
  background: rgba(168,85,247,0.06);
  border: 1px solid rgba(168,85,247,0.18);
  color: var(--sc-text); font-size: 0.82rem; line-height: 1.5;
  margin-top: 0.9rem;
}
.sc-status.correct { color: #86efac; background: rgba(34,197,94,0.08); border-color: rgba(34,197,94,0.32); }
.sc-status.wrong   { color: #fca5a5; background: rgba(239,68,68,0.08); border-color: rgba(239,68,68,0.32); }
.sc-action {
  display: block; margin: 1.2rem auto 0;
  background: linear-gradient(180deg, #a855f7, #7c3aed);
  color: #fff; border: none;
  font-family: 'Heavyweight', 'Space Grotesk', sans-serif;
  font-size: 0.76rem; font-weight: 400; letter-spacing: 0.2em;
  text-transform: uppercase; padding: 0.85rem 1.6rem;
  border-radius: 0.65rem; cursor: pointer; min-height: 44px;
  box-shadow: 0 0 22px var(--sc-accent-glow);
  transition: all 0.2s;
}
.sc-action:hover { transform: translateY(-1px); box-shadow: 0 4px 30px var(--sc-accent-glow); }
.sc-diagram-wrap { display: flex; justify-content: center; position: relative; margin-bottom: 0.6rem; }
.sc-diagram-wrap svg { max-width: 360px; width: 100%; height: auto; }
.sc-target {
  cursor: pointer; transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  transform-origin: center; transform-box: fill-box;
  animation: sc-idle 5s ease-in-out infinite;
}
@keyframes sc-idle { 0%,100% { opacity: 0.92; } 50% { opacity: 1; filter: drop-shadow(0 0 6px currentColor); } }
.sc-target:hover { filter: drop-shadow(0 0 14px var(--sc-accent-glow)); animation-play-state: paused; }
.sc-target.dim { opacity: 0.28; animation: none; }
.sc-target.bloom { animation: sc-bloom 1s ease forwards; }
@keyframes sc-bloom {
  0%   { transform: scale(1); filter: drop-shadow(0 0 8px currentColor); }
  35%  { transform: scale(1.35); filter: drop-shadow(0 0 35px var(--sc-correct)); }
  100% { transform: scale(1.08); filter: drop-shadow(0 0 18px var(--sc-correct)); }
}
.sc-target.repel { animation: sc-repel 0.55s ease; }
@keyframes sc-repel {
  0%,100% { transform: translateX(0); }
  20% { transform: translateX(-4px); filter: drop-shadow(0 0 10px var(--sc-wrong)); }
  40% { transform: translateX(4px);  filter: drop-shadow(0 0 10px var(--sc-wrong)); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(3px); }
}
.sc-label { transition: opacity 0.4s ease; pointer-events: none; }
.sc-label.is-origin { opacity: 0; }
.sc-label.dim { opacity: 0.25; }
.sc-origin-halo, .sc-origin-ring, .sc-origin-core {
  transform-box: fill-box; transform-origin: center; pointer-events: none;
}
.sc-origin-halo { animation: sc-origin-halo 2.4s ease-in-out infinite; filter: blur(2px); }
@keyframes sc-origin-halo { 0%,100% { opacity: 0.22; transform: scale(1); } 50% { opacity: 0.42; transform: scale(1.18); } }
.sc-origin-ring { fill: none; stroke-width: 1.4; animation: sc-origin-ring 2s ease-out infinite; }
@keyframes sc-origin-ring { 0% { transform: scale(0.5); opacity: 0.95; } 100% { transform: scale(3); opacity: 0; } }
.sc-origin-core { animation: sc-origin-pulse 1.6s ease-in-out infinite; filter: drop-shadow(0 0 6px currentColor); }
@keyframes sc-origin-pulse { 0%,100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.7; transform: scale(1.25); } }
.sc-origin-label {
  font-family: 'Heavyweight', 'Newsreader', Georgia, serif;
  font-size: 7.5px; letter-spacing: 0.28em;
  text-anchor: middle; text-transform: uppercase;
  pointer-events: none; font-weight: 400;
}
.sc-trail { fill: none; stroke-width: 2; stroke-linecap: round; stroke-dasharray: 4 5; opacity: 0; }
.sc-particle { opacity: 0; }
.sc-card-frame {
  background: rgba(245,232,255,0.04);
  border: 1px solid rgba(168,85,247,0.28);
  border-radius: 0.9rem;
  padding: 1.1rem 1.1rem 1.2rem;
  max-width: 420px; margin: 0 auto;
  box-shadow: 0 0 32px rgba(168,85,247,0.12);
}
.sc-card-name {
  text-align: center;
  font-family: 'Heavyweight', 'Space Grotesk', sans-serif;
  font-size: 1.15rem; font-weight: 400; letter-spacing: 0.12em;
  color: var(--sc-text-bright); text-transform: uppercase;
  margin-bottom: 0.55rem; text-shadow: 0 0 18px var(--sc-accent-glow);
}
.sc-card-detail {
  text-align: center; font-size: 0.86rem; line-height: 1.55;
  color: var(--sc-text); margin-bottom: 1rem; font-style: italic;
}
.sc-card-row {
  display: flex; justify-content: space-between; align-items: flex-start;
  padding: 0.55rem 0;
  border-bottom: 1px solid rgba(168,85,247,0.14);
  gap: 0.9rem;
}
.sc-card-row:last-child { border-bottom: none; }
.sc-card-row-label {
  color: var(--sc-dim); letter-spacing: 0.18em; text-transform: uppercase;
  font-family: 'Heavyweight', 'Newsreader', Georgia, serif;
  font-size: 0.56rem; flex-shrink: 0; padding-top: 2px;
}
.sc-card-row-value {
  color: var(--sc-text-bright); text-align: right;
  font-size: 0.77rem; line-height: 1.5;
}
@media (max-width: 600px) {
  .sc-name { font-size: 1.55rem; letter-spacing: 0.14em; }
  .sc-prompt { font-size: 0.82rem; letter-spacing: 0.18em; }
  .sc-card-name { font-size: 1rem; }
  .sc-inner { padding: 1.1rem 0.85rem 1.3rem; }
  .sc-diagram-wrap svg { max-width: 280px; }
}

/* Global: hide redundant inline "Labs" span (::before handles the header) */
.wt-lab .lh { display: none; }

/* ===== DESKTOP SCALING (1024px+) ===== */
@media (min-width: 1024px) {
  .container { max-width: 1400px; padding: 0 60px 80px; }
  .hero h1 { font-size: 3.6rem; }
  .hero-desc { font-size: 1.25rem; max-width: 800px; line-height: 1.7; }
  .hero-eyebrow { font-size: 0.9rem; letter-spacing: 0.4em; }
  .scroll-cue { font-size: 0.9rem; }
  .section-title { font-size: 2.6rem; }
  .section-sub { font-size: 1.15rem; line-height: 1.75; max-width: 900px; }
  .section-label { font-size: 0.88rem; letter-spacing: 0.35em; }
  .fam-name { font-size: 2.2rem; }
  .fam-subtitle { font-size: 1.1rem; }
  .fam-section { font-size: 1.1rem; line-height: 1.8; }
  .cmp-table td { font-size: 1.05rem; padding: 1rem 0.85rem; line-height: 1.6; }
  .cmp-table th { font-size: 0.78rem; padding: 0.85rem 0.85rem; }
  .cmp-table .row-label { font-size: 0.88rem; }
  .board-clue { font-size: 1.1rem; padding: 1.4rem 1.6rem; line-height: 1.7; }
  .clue-label { font-size: 0.78rem; }
  .battle-tab { font-size: 0.95rem; padding: 12px 24px; min-height: 48px; }
  .battle-card { font-size: 1.1rem; padding: 1.75rem; line-height: 1.75; }
  .bt-snap-card { font-size: 1rem; }
  .bt-snap-label { font-size: 0.78rem; }
  .wt-stem { font-size: 1.15rem; line-height: 1.75; }
  .wt-choice { font-size: 1.05rem; padding: 16px 24px; min-height: 52px; }
  .wt-beat-q, .wt-beat-a { font-size: 1.05rem; line-height: 1.7; }
  .case-quiz-stem { font-size: 1.15rem; }
  .case-quiz-opt { font-size: 1.05rem; padding: 14px 20px; }
  .elim-card { font-size: 1rem; }
  .mem-card { font-size: 1rem; }
  .dtree-q { font-size: 1.1rem; }
  .dtree-opt { font-size: 1rem; padding: 12px 20px; }
  .photo-strip img { height: 140px; max-width: 220px; }
  .lc-chunk { font-size: 1.05rem; }
  .story-panel { font-size: 1.05rem; }
  .page-nav-crumb { font-size: 0.95rem; }
  .page-nav-crumb a, .page-nav-current { font-size: 0.95rem; }
}

/* ===== Emoji rendering safety (added 2026-05-28) =====
   Older iOS / incomplete font installs may render newer Unicode emoji
   (🩸 🩹 🫁 🫘 🫀 etc) as tofu/text. Force the strongest emoji-capable
   font chain wherever emoji appear in display contexts. */
.hero-icon, .update-icon, .topic-icon, .emoji {
  font-family: "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji",
               "Twemoji Mozilla", system-ui, sans-serif;
  font-variant-emoji: emoji;
}

/* ── Floating nav (.v4): one identical shape on every page ──
   Per-page copies drifted: Newsreader's "normal" line-height renders taller than
   the fallback serif, so the pill height changed page to page. Lock the geometry
   and an explicit, font-independent line-height so the bar is pixel-stable. */
.v4-wrap { padding: calc(1.4rem + env(safe-area-inset-top, 0px)) 1rem 0 !important; }
.v4 {
  gap: 0.5rem !important;
  border-radius: 999px !important;
  padding: 0.45rem 0.55rem 0.45rem 1.4rem !important;
  align-items: center !important;
}
.v4-nav a, .v4-cta, .v4-nav-drawer a, .v4-brand .word { line-height: 1.2 !important; }
@media (max-width: 880px) {
  .v4 { padding: 0.4rem 0.5rem 0.4rem 1rem !important; }
  .v4-cta { display: none !important; }
}