/* ============================================================
   RATIONALITY'S EDGE — author site for CM Sharp
   Design system: "The Edge" — logic (mono, circuit cyan) split
   from human nature (serif, ember/watercolor) by a fracture seam.
   ============================================================ */

:root{
  --ink:        #11181f;   /* page background */
  --ink-2:      #15202a;   /* deeper panel    */
  --slate:      #1d2b36;   /* card surface    */
  --slate-2:    #243643;   /* raised surface  */
  --line:       #2e4250;   /* hairlines       */
  --bone:       #ece5d8;   /* primary text    */
  --bone-dim:   #b3b7ae;   /* secondary text  */
  --circuit:    #6ec6cc;   /* logic accent    */
  --circuit-dim:#3f7d84;
  --ember:      #e8833a;   /* human accent    */
  --ember-soft: #f0a96d;
  --plum:       #a05a86;   /* watercolor accent */
  --gold:       #d8b25c;

  --font-display: "Fraunces", Georgia, serif;
  --font-body:    "Spectral", Georgia, serif;
  --font-logic:   "IBM Plex Mono", "Courier New", monospace;

  --maxw: 1100px;
  --radius: 10px;
}

*{ box-sizing:border-box; margin:0; padding:0; }
html{ scroll-behavior:smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *, *::before, *::after{ animation-duration:.01ms !important; transition-duration:.01ms !important; }
}

body{
  background: var(--ink);
  color: var(--bone);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img{ max-width:100%; display:block; }
a{ color: var(--circuit); text-decoration:none; }
a:hover{ color: var(--ember-soft); }
a:focus-visible, button:focus-visible{ outline: 2px solid var(--ember); outline-offset: 3px; }

.wrap{ max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- the two voices ---------- */
.v-logic{ font-family: var(--font-logic); color: var(--circuit); letter-spacing:.04em; }
.v-human{ font-family: var(--font-display); font-style: italic; color: var(--ember-soft); }

/* ---------- navigation ---------- */
.nav{
  position: sticky; top:0; z-index: 50;
  background: rgba(17,24,31,.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav-inner{
  max-width: var(--maxw); margin:0 auto; padding: 14px 24px;
  display:flex; align-items:center; justify-content:space-between; gap:16px;
}
.nav-brand{
  font-family: var(--font-logic); font-size: 13px; letter-spacing:.14em;
  color: var(--bone); text-transform: uppercase; white-space:nowrap;
}
.nav-brand b{ color: var(--ember); font-weight:600; }
.nav-links{ display:flex; gap: 4px; flex-wrap:wrap; }
.nav-links a{
  font-family: var(--font-logic); font-size: 12.5px; letter-spacing:.06em;
  color: var(--bone-dim); padding: 7px 11px; border-radius: 6px;
}
.nav-links a:hover{ color: var(--bone); background: var(--slate); }
.nav-links a.active{ color: var(--circuit); background: var(--slate); }

/* ---------- the fracture seam (signature element) ---------- */
.seam{
  height: 64px; position:relative; overflow:hidden;
  margin: 0;
}
.seam svg{ position:absolute; inset:0; width:100%; height:100%; }

/* ---------- section scaffolding ---------- */
.section{ padding: 84px 0; }
.section.tint{ background: var(--ink-2); border-top:1px solid var(--line); border-bottom:1px solid var(--line); }

.eyebrow{
  font-family: var(--font-logic); font-size: 12px; letter-spacing:.22em;
  text-transform: uppercase; color: var(--circuit-dim); margin-bottom: 14px;
}
.eyebrow::before{ content:"// "; color: var(--circuit); }

h1,h2,h3{ font-family: var(--font-display); font-weight: 500; line-height:1.12; }
h2.split{ font-size: clamp(30px, 4.4vw, 46px); margin-bottom: 22px; color: var(--bone); }
h2.split .alt{ font-style: italic; color: var(--ember-soft); }
h2.split .code{ font-family: var(--font-logic); font-style:normal; font-size:.72em; color: var(--circuit); letter-spacing:.02em; }

.lede{ font-size: 19px; color: var(--bone-dim); max-width: 720px; }
.lede strong{ color: var(--bone); font-weight:600; }

/* ---------- buttons ---------- */
.btn{
  display:inline-block; cursor:pointer;
  font-family: var(--font-logic); font-size: 13.5px; letter-spacing:.08em;
  padding: 13px 22px; border-radius: 8px; border:1px solid transparent;
  transition: transform .15s ease, background .15s ease, color .15s ease;
}
.btn:active{ transform: translateY(1px); }
.btn-ember{ background: var(--ember); color: #1a1208; font-weight:600; }
.btn-ember:hover{ background: var(--ember-soft); color:#1a1208; }
.btn-ghost{ background: transparent; color: var(--circuit); border-color: var(--circuit-dim); }
.btn-ghost:hover{ border-color: var(--circuit); color: var(--circuit); background: rgba(110,198,204,.07); }
.btn-small{ padding: 9px 14px; font-size: 12.5px; }

/* ---------- cards ---------- */
.card{
  background: var(--slate); border:1px solid var(--line);
  border-radius: var(--radius); padding: 26px;
}

/* ---------- reveal on scroll ---------- */
.reveal{ opacity:0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in{ opacity:1; transform:none; }

/* ---------- footer ---------- */
footer{
  border-top:1px solid var(--line); background: var(--ink-2);
  padding: 44px 0 56px; margin-top: 0;
}
.foot-grid{ display:flex; justify-content:space-between; gap:28px; flex-wrap:wrap; align-items:flex-start; }
.foot-grid .v-logic{ font-size:12px; }
footer p{ color: var(--bone-dim); font-size: 14.5px; max-width: 460px; }
footer nav{ display:flex; flex-direction:column; gap:8px; }
footer nav a{ font-family: var(--font-logic); font-size: 13px; color: var(--bone-dim); }
footer nav a:hover{ color: var(--circuit); }
.foot-sig{ margin-top:34px; font-family: var(--font-logic); font-size: 11.5px; color: #5d6f7b; letter-spacing:.08em; }

/* ============================================================
   HOME
   ============================================================ */
.hero{
  position:relative; overflow:hidden;
  border-bottom: 1px solid var(--line);
}
.hero-bg{ position:absolute; inset:0; z-index:0; pointer-events:none; }
.hero-inner{
  position:relative; z-index:1;
  max-width: var(--maxw); margin:0 auto; padding: 84px 24px 96px;
  display:grid; grid-template-columns: 1.25fr .85fr; gap: 56px; align-items:center;
}
.hero-kicker{
  font-family: var(--font-logic); color: var(--circuit); font-size: 13px;
  letter-spacing:.2em; text-transform:uppercase; margin-bottom: 22px;
}
.hero h1{
  font-size: clamp(44px, 6.5vw, 76px); letter-spacing:-.01em; color:var(--bone);
}
.hero h1 .edge-word{
  font-style: italic; color: var(--ember);
  text-shadow: 0 0 36px rgba(232,131,58,.35);
}
.hero-sub{
  margin-top: 24px; font-size: 19.5px; color: var(--bone-dim); max-width: 540px;
}
.hero-sub .v-logic{ font-size: 16px; }
.hero-cta{ margin-top: 36px; display:flex; gap: 14px; flex-wrap:wrap; }
.hero-meta{
  margin-top: 30px; font-family: var(--font-logic); font-size: 12.5px;
  color:#5d6f7b; letter-spacing:.1em;
}
.hero-cover{ position:relative; justify-self:center; }
.hero-cover img{
  width: min(330px, 80vw); border-radius: 6px;
  box-shadow: -24px 28px 60px rgba(0,0,0,.55), 0 0 0 1px rgba(255,255,255,.06);
  transform: rotate(2.5deg);
}
.hero-cover::before{
  content:""; position:absolute; inset:-12%;
  background: radial-gradient(closest-side, rgba(232,131,58,.16), transparent 70%);
  z-index:-1;
}

/* duality strip */
.duality{ display:grid; grid-template-columns: 1fr 1fr; border-top:1px solid var(--line); }
.duality > div{ padding: 34px 30px; }
.duality .d-logic{ background: linear-gradient(135deg, #15222c, #122029); border-right:1px solid var(--line); }
.duality .d-human{ background: linear-gradient(315deg, #241b22, #1c161e); }
.duality h3{ font-size: 21px; margin-bottom: 8px; }
.duality .d-logic h3{ font-family: var(--font-logic); font-weight:500; color: var(--circuit); }
.duality .d-human h3{ color: var(--ember-soft); font-style: italic; }
.duality p{ font-size: 15.5px; color: var(--bone-dim); }

/* parts */
.parts{ display:grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 42px; }
.part-card{ position:relative; overflow:hidden; }
.part-card .part-no{
  font-family: var(--font-logic); font-size: 12px; letter-spacing:.18em;
  color: var(--circuit-dim); margin-bottom: 14px;
}
.part-card h3{ font-size: 22px; margin-bottom: 10px; color: var(--bone); }
.part-card p{ font-size: 15px; color: var(--bone-dim); margin-bottom: 16px; }
.part-card .part-range{
  font-family: var(--font-logic); font-size: 12px; color: var(--ember-soft);
}
.part-card::after{
  content:""; position:absolute; right:-30px; bottom:-30px; width:110px; height:110px;
  border:1px solid var(--line); transform: rotate(45deg); border-radius: 18px;
  opacity:.5;
}

/* featured experiments */
.feat-grid{ display:grid; grid-template-columns: repeat(3, 1fr); gap:20px; margin-top:42px; }
.feat{
  display:flex; flex-direction:column; gap:12px; min-height: 100%;
  transition: transform .2s ease, border-color .2s ease;
}
.feat:hover{ transform: translateY(-4px); border-color: var(--circuit-dim); }
.feat .feat-art{ height: 110px; border-radius: 8px; overflow:hidden; background: var(--ink-2); border:1px solid var(--line); }
.feat .feat-art svg{ width:100%; height:100%; }
.feat h3{ font-size: 20px; color:var(--bone); }
.feat p{ font-size: 14.5px; color: var(--bone-dim); flex:1; }
.feat .feat-link{ font-family: var(--font-logic); font-size: 12.5px; letter-spacing:.08em; }

/* author */
.author-grid{ display:grid; grid-template-columns: .9fr 1.4fr; gap: 48px; align-items:center; }
.author-mark{
  aspect-ratio: 1; border-radius: 50%; max-width: 290px; margin:0 auto;
  background:
    radial-gradient(circle at 30% 30%, rgba(110,198,204,.18), transparent 55%),
    radial-gradient(circle at 72% 70%, rgba(232,131,58,.22), transparent 60%),
    var(--slate);
  border:1px solid var(--line);
  display:flex; align-items:center; justify-content:center;
}
.author-mark span{
  font-family: var(--font-display); font-size: 76px; font-style:italic;
  background: linear-gradient(120deg, var(--circuit), var(--ember));
  -webkit-background-clip: text; background-clip:text; color:transparent;
}
.author-grid blockquote{
  border-left: 3px solid var(--ember); padding-left: 20px; margin: 22px 0;
  font-style: italic; color: var(--bone); font-size: 18px;
}

/* book CTA */
.book-cta{
  display:grid; grid-template-columns: auto 1fr; gap: 44px; align-items:center;
}
.book-cta img{ width: 210px; border-radius:6px; box-shadow: 0 18px 44px rgba(0,0,0,.5); }
.book-points{ list-style:none; margin: 18px 0 26px; display:grid; gap: 10px; }
.book-points li{ padding-left: 26px; position:relative; color: var(--bone-dim); font-size: 15.5px; }
.book-points li::before{
  content:"▸"; position:absolute; left:0; color: var(--ember); font-family: var(--font-logic);
}

/* ============================================================
   CHAPTERS EXPLORER
   ============================================================ */
.page-head{ padding: 72px 0 36px; }
.page-head h1{ font-size: clamp(36px, 5vw, 56px); color: var(--bone); }
.page-head h1 em{ color: var(--ember-soft); }
.page-head .lede{ margin-top: 16px; }

.filters{
  display:flex; gap:10px; flex-wrap:wrap; align-items:center;
  margin: 26px 0 8px;
}
.filter-btn{
  font-family: var(--font-logic); font-size: 12.5px; letter-spacing:.05em;
  background: var(--slate); border:1px solid var(--line); color: var(--bone-dim);
  padding: 9px 14px; border-radius: 999px; cursor:pointer;
  transition: all .15s ease;
}
.filter-btn:hover{ color: var(--bone); border-color: var(--circuit-dim); }
.filter-btn.active{ background: var(--circuit); color: #0d1a1c; border-color: var(--circuit); font-weight:600; }
.search-box{
  flex:1; min-width: 220px;
  font-family: var(--font-logic); font-size: 13.5px;
  background: var(--ink-2); border:1px solid var(--line); color: var(--bone);
  padding: 11px 16px; border-radius: 999px;
}
.search-box::placeholder{ color:#56697a; }
.search-box:focus{ outline:none; border-color: var(--circuit-dim); }

.chap-grid{ display:grid; grid-template-columns: 1fr 1fr; gap: 16px; padding-bottom: 90px; }
.chap{
  background: var(--slate); border:1px solid var(--line); border-radius: var(--radius);
  overflow:hidden; transition: border-color .2s ease;
}
.chap:hover{ border-color: var(--circuit-dim); }
.chap summary{
  list-style:none; cursor:pointer; padding: 20px 22px;
  display:grid; grid-template-columns: 52px 1fr; gap: 16px; align-items:baseline;
}
.chap summary::-webkit-details-marker{ display:none; }
.chap .chap-no{
  font-family: var(--font-logic); font-size: 21px; color: var(--circuit-dim);
}
.chap[open] .chap-no{ color: var(--ember); }
.chap h3{ font-size: 19px; color: var(--bone); }
.chap .chap-hook{
  display:block; margin-top: 4px; font-style:italic; font-size: 14px; color: var(--ember-soft);
  font-family: var(--font-display);
}
.chap .chap-body{
  padding: 0 22px 22px 90px; color: var(--bone-dim); font-size: 15px;
}
.chap .chap-body .rw{
  margin-top: 12px; padding: 12px 14px; background: var(--ink-2);
  border-left: 3px solid var(--circuit-dim); border-radius: 0 6px 6px 0;
  font-size: 14px;
}
.chap .chap-body .rw b{ font-family: var(--font-logic); font-size:11.5px; letter-spacing:.14em; color: var(--circuit); display:block; margin-bottom:4px; }
.chap .chap-tag{
  display:inline-block; margin-top:12px;
  font-family: var(--font-logic); font-size: 11px; letter-spacing:.1em;
  color: var(--plum); border:1px solid #50384a; padding: 4px 9px; border-radius:999px;
}
.count-line{ font-family: var(--font-logic); font-size: 12.5px; color:#5d6f7b; margin: 10px 0 22px; }

/* ============================================================
   LAB (interactive experiments)
   ============================================================ */
.lab-toc{ display:flex; gap:10px; flex-wrap:wrap; margin: 24px 0 0; }
.lab-toc a{
  font-family: var(--font-logic); font-size:12.5px; letter-spacing:.05em;
  border:1px solid var(--line); padding: 8px 14px; border-radius:999px; color: var(--bone-dim);
}
.lab-toc a:hover{ border-color: var(--circuit-dim); color: var(--circuit); }

.experiment{
  margin: 64px 0; background: var(--slate); border:1px solid var(--line);
  border-radius: 14px; overflow:hidden;
}
.exp-head{
  padding: 26px 30px; border-bottom: 1px solid var(--line);
  background: linear-gradient(120deg, rgba(110,198,204,.06), rgba(232,131,58,.05));
  display:flex; justify-content:space-between; gap:18px; align-items:baseline; flex-wrap:wrap;
}
.exp-head h2{ font-size: 26px; color: var(--bone); }
.exp-head h2 em{ color: var(--ember-soft); }
.exp-head .exp-ch{ font-family: var(--font-logic); font-size: 12px; letter-spacing:.16em; color: var(--circuit-dim); }
.exp-body{ padding: 28px 30px 32px; }
.exp-body .premise{ color: var(--bone-dim); font-size: 15.5px; max-width: 760px; margin-bottom: 24px; }
.exp-stage{
  background: var(--ink-2); border:1px solid var(--line); border-radius: 10px;
  padding: 26px; margin-bottom: 18px;
}
.exp-note{
  font-size: 14px; color: var(--bone-dim); border-left: 3px solid var(--ember);
  padding: 10px 16px; background: rgba(232,131,58,.05); border-radius: 0 6px 6px 0;
}
.exp-note b{ color: var(--ember-soft); }

/* doors (Monty Hall) */
.doors{ display:flex; gap: 18px; justify-content:center; margin: 10px 0 20px; flex-wrap:wrap; }
.door{
  width: 120px; height: 170px; border-radius: 8px 8px 4px 4px;
  background: linear-gradient(180deg, #2a3f4e, #22323e);
  border: 2px solid var(--circuit-dim);
  cursor:pointer; position:relative;
  display:flex; align-items:center; justify-content:center;
  font-family: var(--font-logic); font-size: 30px; color: var(--circuit);
  transition: transform .15s ease, border-color .15s ease, background .25s ease;
}
.door:hover{ transform: translateY(-4px); border-color: var(--circuit); }
.door.picked{ border-color: var(--ember); box-shadow: 0 0 0 3px rgba(232,131,58,.25); }
.door.open{ background: #182027; cursor:default; }
.door.open .door-face{ font-size: 44px; }
.door.win{ border-color: var(--gold); box-shadow: 0 0 24px rgba(216,178,92,.35); }
.door:disabled{ cursor:default; opacity:.85; }
.mh-controls, .ctrl-row{ display:flex; gap: 12px; justify-content:center; flex-wrap:wrap; margin-top: 8px; }
.mh-msg, .stage-msg{
  text-align:center; font-size: 16px; min-height: 26px; margin-bottom: 14px; color: var(--bone);
}
.scoreline{
  display:flex; gap: 26px; justify-content:center; flex-wrap:wrap;
  font-family: var(--font-logic); font-size: 13px; color: var(--bone-dim); margin-top: 18px;
}
.scoreline b{ color: var(--circuit); font-size: 16px; }
.scoreline .em b{ color: var(--ember-soft); }

.bars{ display:grid; gap: 10px; margin-top: 16px; }
.bar-row{ display:grid; grid-template-columns: 130px 1fr 64px; gap: 12px; align-items:center; }
.bar-row .bar-label{ font-family: var(--font-logic); font-size: 12px; color: var(--bone-dim); text-align:right; }
.bar-track{ height: 18px; background: var(--ink); border-radius: 999px; overflow:hidden; border:1px solid var(--line); }
.bar-fill{ height:100%; width:0%; border-radius:999px; transition: width .6s ease; }
.bar-fill.c{ background: linear-gradient(90deg, var(--circuit-dim), var(--circuit)); }
.bar-fill.e{ background: linear-gradient(90deg, #9c5526, var(--ember)); }
.bar-val{ font-family: var(--font-logic); font-size: 12.5px; color: var(--bone); }

/* prisoner's dilemma */
.pd-grid{ display:grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.pd-choice{ display:flex; gap: 14px; justify-content:center; margin: 16px 0; flex-wrap:wrap; }
.pd-history{
  display:flex; gap: 5px; flex-wrap:wrap; margin-top: 14px; min-height: 26px;
  justify-content:center;
}
.pd-cell{
  width: 22px; height: 22px; border-radius: 5px; font-size:11px;
  display:flex; align-items:center; justify-content:center;
  font-family: var(--font-logic);
}
.pd-cell.cc{ background: #2c5a52; color:#9be0c9; }
.pd-cell.dd{ background: #5a2c2c; color:#e0a09b; }
.pd-cell.cd{ background: #5a4a2c; color:#e0cd9b; }
.pd-cell.dc{ background: #2c3f5a; color:#9bc0e0; }
.pd-matrix{ width:100%; border-collapse:collapse; font-size: 13.5px; margin-top: 6px; }
.pd-matrix th, .pd-matrix td{
  border:1px solid var(--line); padding: 9px 10px; text-align:center;
  font-family: var(--font-logic);
}
.pd-matrix th{ color: var(--circuit); font-weight:500; background: var(--ink-2); }
.pd-matrix td{ color: var(--bone-dim); }
select.exp-select{
  font-family: var(--font-logic); font-size: 13px;
  background: var(--ink-2); color: var(--bone); border:1px solid var(--line);
  border-radius: 8px; padding: 10px 12px;
}

/* dollar auction */
.da-stage{ text-align:center; }
.da-bill{
  display:inline-block; padding: 16px 38px; border-radius: 8px; margin-bottom: 18px;
  background: linear-gradient(120deg, #234034, #1c3329);
  border: 1px solid #3d6a52; color: #b9e3c6;
  font-family: var(--font-logic); font-size: 26px; letter-spacing:.08em;
}
.da-ledger{
  display:flex; gap: 30px; justify-content:center; margin: 14px 0 6px; flex-wrap:wrap;
  font-family: var(--font-logic); font-size: 13.5px; color: var(--bone-dim);
}
.da-ledger b{ font-size: 19px; display:block; margin-top:2px; }
.da-you b{ color: var(--ember-soft); }
.da-rival b{ color: var(--circuit); }

/* birthday */
.bday-room{
  display:flex; flex-wrap:wrap; gap: 6px; justify-content:center;
  margin: 14px auto 18px; max-width: 640px; min-height: 64px;
}
.bday-dot{
  width: 17px; height: 17px; border-radius: 50%;
  background: #34505f; border:1px solid #46687a;
  transition: background .2s ease, transform .2s ease;
}
.bday-dot.match{ background: var(--ember); border-color: var(--ember-soft); transform: scale(1.25); box-shadow: 0 0 10px rgba(232,131,58,.6); }
input[type=range]{ accent-color: var(--ember); width: min(320px, 80%); }
.range-row{ display:flex; align-items:center; gap: 14px; justify-content:center; flex-wrap:wrap; margin-bottom: 8px; font-family: var(--font-logic); font-size: 13px; color: var(--bone-dim); }
.range-row output{ color: var(--ember-soft); font-size: 16px; min-width: 36px; }

/* beauty contest */
.bc-input-row{ display:flex; gap:12px; justify-content:center; align-items:center; flex-wrap:wrap; margin-bottom: 16px; }
.bc-input-row input[type=number]{
  width: 110px; font-family: var(--font-logic); font-size: 18px; text-align:center;
  background: var(--ink-2); color: var(--bone); border:1px solid var(--line);
  border-radius: 8px; padding: 11px;
}
.bc-dist{ display:flex; align-items:flex-end; gap:2px; height: 90px; margin: 18px auto 6px; max-width: 560px; }
.bc-bar{ flex:1; background: #34505f; border-radius: 2px 2px 0 0; min-height:2px; transition: height .4s ease, background .2s; }
.bc-bar.you{ background: var(--ember); }
.bc-bar.target{ background: var(--circuit); }
.bc-axis{ display:flex; justify-content:space-between; max-width:560px; margin: 0 auto; font-family:var(--font-logic); font-size: 11px; color:#5d6f7b; }

/* ============================================================
   STORY (scrollytelling)
   ============================================================ */
.story-hero{
  min-height: 78vh; display:flex; align-items:center; position:relative; overflow:hidden;
  border-bottom: 1px solid var(--line);
}
.story-hero .wrap{ position:relative; z-index:1; }
.story-hero h1{ font-size: clamp(40px, 6vw, 70px); max-width: 800px; color:var(--bone); }
.story-hero h1 em{ color: var(--ember); }
.story-hero .lede{ margin-top: 20px; }
.scroll-cue{
  position:absolute; bottom: 28px; left:50%; transform: translateX(-50%);
  font-family: var(--font-logic); font-size: 11px; letter-spacing:.24em; color:#5d6f7b;
  text-transform:uppercase; animation: cue 2.2s ease-in-out infinite;
}
@keyframes cue{ 0%,100%{ transform: translate(-50%,0); opacity:.7 } 50%{ transform: translate(-50%,8px); opacity:1 } }

.story-day{
  min-height: 92vh; display:flex; align-items:center; position:relative;
}
.story-day .wrap{ display:grid; grid-template-columns: 120px 1fr; gap: 40px; align-items:start; }
.day-rail{ position:sticky; top: 120px; text-align:right; }
.day-rail .day-no{ font-family: var(--font-logic); font-size: 52px; color: var(--circuit-dim); line-height:1; }
.day-rail .day-name{ font-family: var(--font-logic); font-size: 12px; letter-spacing:.2em; color:#5d6f7b; text-transform:uppercase; margin-top:6px; }
.story-card{ max-width: 660px; }
.story-card h2{ font-size: clamp(26px, 3.4vw, 38px); margin-bottom: 18px; color: var(--bone); }
.story-card h2 em{ color: var(--ember-soft); }
.story-card p{ color: var(--bone-dim); margin-bottom: 16px; font-size: 17px; }
.story-card p strong{ color: var(--bone); }
.logic-chain{
  margin: 22px 0; padding: 18px 20px; border-radius: 10px;
  background: var(--ink-2); border: 1px solid var(--line);
  font-family: var(--font-logic); font-size: 13.5px; color: var(--circuit);
  line-height: 1.9;
}
.logic-chain .strike{ text-decoration: line-through; color:#50656f; }
.story-twist{
  font-family: var(--font-display); font-style:italic; font-size: 22px; color: var(--ember-soft);
  border-left: 3px solid var(--ember); padding-left: 18px; margin: 26px 0 6px;
}
.story-epilogue{ background: var(--ink-2); border-top: 1px solid var(--line); }

/* ============================================================
   QUIZ
   ============================================================ */
.quiz-shell{ max-width: 760px; margin: 0 auto 100px; }
.quiz-progress{
  height: 6px; background: var(--slate); border-radius:999px; overflow:hidden; margin: 30px 0;
  border:1px solid var(--line);
}
.quiz-progress div{ height:100%; width:0%; background: linear-gradient(90deg, var(--circuit), var(--ember)); transition: width .4s ease; }
.q-card{ padding: 34px; }
.q-num{ font-family: var(--font-logic); font-size: 12px; letter-spacing:.2em; color: var(--circuit-dim); margin-bottom: 12px; }
.q-card h2{ font-size: 24px; color: var(--bone); margin-bottom: 8px; line-height:1.3; }
.q-source{ font-family: var(--font-display); font-style:italic; font-size: 14px; color: var(--plum); margin-bottom: 22px; }
.q-opts{ display:grid; gap: 12px; }
.q-opt{
  text-align:left; cursor:pointer; font-family: var(--font-body); font-size: 15.5px;
  background: var(--ink-2); border:1px solid var(--line); color: var(--bone);
  padding: 15px 18px; border-radius: 10px; transition: all .15s ease;
}
.q-opt:hover{ border-color: var(--circuit-dim); background: #1a2832; }
.q-opt.correct{ border-color: #4fae8d; background: rgba(79,174,141,.12); }
.q-opt.wrong{ border-color: #c0604f; background: rgba(192,96,79,.1); }
.q-opt:disabled{ cursor:default; }
.q-explain{
  margin-top: 20px; padding: 16px 18px; border-radius: 10px; font-size: 14.5px;
  background: rgba(110,198,204,.06); border:1px solid var(--circuit-dim); color: var(--bone-dim);
  display:none;
}
.q-explain.show{ display:block; }
.q-explain b{ color: var(--circuit); }
.q-next{ margin-top: 22px; display:none; }
.q-next.show{ display:inline-block; }

.quiz-result{ text-align:center; padding: 44px 34px; }
.quiz-result .verdict{
  font-family: var(--font-display); font-style:italic; font-size: clamp(28px, 4vw, 40px);
  color: var(--ember-soft); margin: 14px 0 8px;
}
.quiz-result .score-big{ font-family: var(--font-logic); font-size: 15px; color: var(--circuit); letter-spacing:.1em; }
.quiz-result p{ color: var(--bone-dim); max-width: 520px; margin: 16px auto 26px; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px){
  .hero-inner{ grid-template-columns: 1fr; padding: 60px 24px 70px; gap: 44px; }
  .hero-cover{ order: -1; }
  .parts, .feat-grid{ grid-template-columns: 1fr; }
  .author-grid, .book-cta, .pd-grid{ grid-template-columns: 1fr; }
  .chap-grid{ grid-template-columns: 1fr; }
  .duality{ grid-template-columns: 1fr; }
  .duality .d-logic{ border-right:none; border-bottom:1px solid var(--line); }
  .story-day .wrap{ grid-template-columns: 1fr; gap: 16px; }
  .day-rail{ position:static; text-align:left; display:flex; gap:14px; align-items:baseline; }
  .chap .chap-body{ padding-left: 22px; }
  .book-cta img{ margin: 0 auto; }
}
@media (max-width: 560px){
  .section{ padding: 60px 0; }
  .door{ width: 92px; height: 136px; }
  .nav-links a{ padding: 6px 8px; font-size: 11.5px; }
}