:root {
  --bg: #05060f;
  --ink: #eef1ff;
  --muted: #9aa3c7;
  --dim: #5d6690;
  --blue: #4f7cff;
  --cyan: #38e1ff;
  --red: #ff3b5c;
  --amber: #ffb547;
  --green: #2bf5a0;
  --glass: rgba(14, 18, 40, 0.55);
  --line: rgba(130, 150, 255, 0.16);
  --radius: 18px;
  --font: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; }
h1, h2, h3 { line-height: 1.05; margin: 0 0 .5em; letter-spacing: -0.03em; }
h1 { font-size: clamp(2.6rem, 7vw, 6rem); font-weight: 800; }
h2 { font-size: clamp(2.1rem, 5vw, 4.2rem); font-weight: 800; }
h2.big { font-size: clamp(2.8rem, 8vw, 7rem); }
h3 { font-size: 1.2rem; letter-spacing: -0.01em; }
p { margin: 0 0 1em; color: var(--muted); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

#scene {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  display: block;
  transform: translateZ(0);
  will-change: transform;
}
.grain {
  position: fixed; inset: -50%; z-index: 1; pointer-events: none; opacity: .06;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain 1.2s steps(6) infinite;
  transform: translateZ(0);
}
@keyframes grain { 0%{transform:translate(0,0)} 33%{transform:translate(-3%,2%)} 66%{transform:translate(2%,-3%)} 100%{transform:translate(0,0)} }
.vignette { position: fixed; inset: 0; z-index: 1; pointer-events: none; background: radial-gradient(ellipse at center, transparent 45%, rgba(2,3,10,.85) 100%); }

/* NAV */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 18px clamp(18px, 4vw, 48px);
  background: linear-gradient(to bottom, rgba(5,6,15,.8), transparent);
  backdrop-filter: blur(2px);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; letter-spacing: -0.02em; color: var(--blue); }
.brand span { color: var(--ink); }
.nav-links { display: flex; gap: 28px; }
.nav-links a { text-decoration: none; color: var(--muted); font-size: .92rem; transition: color .2s; }
.nav-links a:hover { color: var(--ink); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5em;
  padding: 14px 24px; border-radius: 999px; border: 0; cursor: pointer;
  background: linear-gradient(135deg, var(--blue), #7a5cff);
  color: #fff; font: 600 1rem/1 var(--font); text-decoration: none;
  box-shadow: 0 10px 40px -10px rgba(79,124,255,.7), inset 0 1px 0 rgba(255,255,255,.25);
  transition: transform .2s, box-shadow .2s;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 16px 50px -10px rgba(79,124,255,.9), inset 0 1px 0 rgba(255,255,255,.25); }
.btn-ghost { background: rgba(255,255,255,.04); box-shadow: inset 0 0 0 1px var(--line); }
.btn-ghost:hover { background: rgba(255,255,255,.08); box-shadow: inset 0 0 0 1px rgba(130,150,255,.4); }
.btn-small { padding: 10px 18px; font-size: .9rem; }
.btn-wide { width: 100%; padding: 18px; font-size: 1.05rem; }

/* PROGRESS */
.progress { position: fixed; right: clamp(12px, 2vw, 28px); top: 50%; transform: translateY(-50%); z-index: 15; height: 46vh; width: 14px; }
.progress::before { content: ""; position: absolute; left: 6px; top: 0; bottom: 0; width: 2px; background: var(--line); border-radius: 2px; }
.progress-bar { position: absolute; left: 6px; top: 0; width: 2px; height: 0; background: linear-gradient(var(--blue), var(--cyan)); border-radius: 2px; box-shadow: 0 0 12px var(--blue); }
.progress-dots { list-style: none; margin: 0; padding: 0; position: absolute; inset: 0; }
.progress-dots li { position: absolute; left: 2px; width: 10px; height: 10px; border-radius: 50%; background: var(--bg); border: 2px solid var(--dim); transform: translateY(-50%); cursor: pointer; transition: border-color .3s, background .3s; }
.progress-dots li.on { border-color: var(--cyan); background: var(--cyan); }
.progress-dots li span { position: absolute; right: 18px; top: 50%; transform: translateY(-50%); white-space: nowrap; font-size: .72rem; color: var(--muted); opacity: 0; transition: opacity .2s; pointer-events: none; font-family: var(--mono); }
.progress-dots li:hover span, .progress-dots li.current span { opacity: 1; }

/* LAYOUT */
main { position: relative; z-index: 5; }
.chapter { min-height: 140vh; display: flex; align-items: center; padding: 18vh 0; position: relative; }
.hero { min-height: 100vh; padding-top: 14vh; }
.wrap { width: min(1180px, 100% - 2 * clamp(20px, 6vw, 80px)); margin: 0 auto; }
.split { display: grid; grid-template-columns: 1.05fr 1fr; gap: clamp(30px, 6vw, 90px); align-items: center; }
.split.rev .copy { order: 0; }
.center { text-align: center; }
.copy.narrow, .narrow { max-width: 640px; }
.narrow-p { max-width: 620px; margin-left: auto; margin-right: auto; }
.copy.center { margin: 0 auto 50px; max-width: 760px; }

.eyebrow { display: inline-flex; align-items: center; gap: 10px; font-family: var(--mono); font-size: .8rem; color: var(--cyan); padding: 8px 14px; border: 1px solid var(--line); border-radius: 999px; background: rgba(10,14,32,.6); }
.pulse-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--red); box-shadow: 0 0 0 0 rgba(255,59,92,.6); animation: pulse 1.6s infinite; }
@keyframes pulse { 70% { box-shadow: 0 0 0 10px rgba(255,59,92,0); } 100% { box-shadow: 0 0 0 0 rgba(255,59,92,0); } }
.hero h1 { margin-top: 28px; max-width: 13em; }
.hero h1 .line { display: block; }
.lede { font-size: clamp(1.05rem, 1.6vw, 1.25rem); max-width: 600px; color: #b6bde0; }
.cta-row { display: flex; flex-wrap: wrap; gap: 14px; margin: 34px 0 50px; }
.hint { font-family: var(--mono); font-size: .78rem; color: var(--dim); display: flex; align-items: center; gap: 10px; }
.mouse { width: 16px; height: 26px; border: 2px solid var(--dim); border-radius: 10px; position: relative; }
.mouse::after { content: ""; position: absolute; left: 50%; top: 5px; width: 2px; height: 5px; margin-left: -1px; background: var(--cyan); border-radius: 2px; animation: wheel 1.5s infinite; }
@keyframes wheel { to { transform: translateY(8px); opacity: 0; } }

.glitch { font-style: normal; color: var(--red); position: relative; display: inline-block; text-shadow: 0 0 30px rgba(255,59,92,.5); }
.glitch::before, .glitch::after { content: attr(data-text); position: absolute; left: 0; top: 0; width: 100%; overflow: hidden; }
.glitch::before { color: var(--cyan); animation: gl1 2.8s infinite steps(1); clip-path: inset(0 0 60% 0); }
.glitch::after { color: #ff9ab0; animation: gl2 2.2s infinite steps(1); clip-path: inset(55% 0 0 0); }
@keyframes gl1 { 0%,86%,100% { transform: none; opacity: 0; } 88% { transform: translate(-4px,-2px); opacity: 1; } 92% { transform: translate(3px,1px); opacity: 1; } }
@keyframes gl2 { 0%,80%,100% { transform: none; opacity: 0; } 82% { transform: translate(4px,2px); opacity: 1; } 85% { transform: translate(-3px,0); opacity: 1; } }

.chapter-num { font-family: var(--mono); font-size: .8rem; color: var(--cyan); letter-spacing: .08em; text-transform: uppercase; margin-bottom: 18px; }
.grad { background: linear-gradient(90deg, var(--blue), var(--cyan), #b28bff); -webkit-background-clip: text; background-clip: text; color: transparent; }
.grad-green { background: linear-gradient(90deg, var(--green), var(--cyan)); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* REVEAL */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .6s cubic-bezier(.2,.7,.2,1), transform .6s cubic-bezier(.2,.7,.2,1); transition-delay: calc(var(--d, 0) * 70ms); }
.hero .reveal, .reveal.in { opacity: 1; transform: none; }

/* CH1 NOTIFS */
.notif-stack { display: grid; gap: 14px; perspective: 900px; }
.notif {
  display: grid; grid-template-columns: 40px 1fr auto; gap: 14px; align-items: center;
  padding: 16px 18px; border-radius: 20px; background: rgba(22,24,44,.72); border: 1px solid rgba(255,255,255,.08);
  backdrop-filter: blur(16px); box-shadow: 0 20px 60px -20px rgba(0,0,0,.8);
}
.notif.reveal { transform: translateY(40px) rotateX(30deg); }
.notif.reveal.in { transform: none; }
.notif strong { display: block; font-size: .98rem; }
.notif span { font-size: .86rem; color: var(--muted); }
.notif time { font-size: .75rem; color: var(--dim); align-self: start; }
.notif-icon { width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; font-weight: 800; color: #fff; }
.notif-icon.red { background: var(--red); box-shadow: 0 0 24px rgba(255,59,92,.6); }
.notif-icon.amber { background: var(--amber); color: #2a1a00; }
.notif-icon.gray { background: #33395c; }

/* CH2 */
.clean-highlight {
  font-family: inherit;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #ffd394 0%, #ffb547 50%, #ff8a3d 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}
.chapter[data-chapter="2"] .copy.narrow {
  background: rgba(5, 6, 15, 0.72);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 181, 71, 0.15);
  border-radius: var(--radius);
  padding: 32px 36px;
  box-shadow: 0 24px 60px -15px rgba(0, 0, 0, 0.85);
}
.scatter { font-family: var(--mono); color: var(--amber); letter-spacing: .05em; word-spacing: -.1em; }
.tool-cloud { list-style: none; margin: 30px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 10px; max-width: 720px; }
.tool-cloud li { font-family: var(--mono); font-size: .82rem; padding: 8px 14px; border-radius: 10px; border: 1px dashed rgba(255,181,71,.35); color: #ffd394; background: rgba(15,10,5,.6); backdrop-filter: blur(8px); }
.tool-cloud li:nth-child(odd).in { transform: rotate(-2deg); }
.tool-cloud li:nth-child(3n).in { transform: rotate(3deg) translateY(4px); }
.mini-hint { font-family: var(--mono); font-size: .76rem; color: var(--dim); margin-top: 24px; }

/* CH3 */
.mega-btn {
  position: relative; margin: 40px auto 18px; display: inline-grid; place-items: center;
  width: 220px; height: 220px; border-radius: 50%; border: 0; cursor: pointer;
  background: radial-gradient(circle at 35% 30%, #7d9bff, var(--blue) 45%, #2a2f9c 100%);
  color: #fff; font: 700 1.05rem/1.25 var(--font); padding: 30px;
  box-shadow: 0 0 0 10px rgba(79,124,255,.12), 0 0 0 24px rgba(79,124,255,.06), 0 30px 90px -10px rgba(79,124,255,.9), inset 0 -10px 30px rgba(0,0,0,.35), inset 0 6px 14px rgba(255,255,255,.35);
  transition: transform .25s, box-shadow .25s;
}
.mega-btn:hover { transform: scale(1.05); }
.mega-btn:active { transform: scale(.96); }
.mega-btn.done { background: radial-gradient(circle at 35% 30%, #8affd0, var(--green) 45%, #0b7a52 100%); box-shadow: 0 0 0 10px rgba(43,245,160,.15), 0 0 0 24px rgba(43,245,160,.06), 0 30px 90px -10px rgba(43,245,160,.8), inset 0 -10px 30px rgba(0,0,0,.3), inset 0 6px 14px rgba(255,255,255,.35); color: #032018; }
.mega-ring { position: absolute; inset: -14px; border-radius: 50%; border: 2px solid rgba(56,225,255,.5); animation: ring 2.2s infinite; }
@keyframes ring { from { transform: scale(.9); opacity: 1; } to { transform: scale(1.35); opacity: 0; } }
.mega-label { position: relative; }
.assemble-status { font-family: var(--mono); font-size: .85rem; color: var(--cyan); min-height: 1.6em; }

/* CH4 EXHIBITS */
.exhibits { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 50px; perspective: 1200px; }
.exhibit, .plan {
  position: relative; padding: 26px; border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(25,32,70,.72), rgba(10,12,30,.72));
  border: 1px solid var(--line); backdrop-filter: blur(14px);
  transform-style: preserve-3d; transition: transform .25s ease-out, border-color .3s, opacity .9s, filter .9s;
}
.exhibit:hover, .plan:hover { border-color: rgba(56,225,255,.45); }
.exhibit::after, .plan::after { content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none; background: radial-gradient(400px circle at var(--mx, 50%) var(--my, 50%), rgba(79,124,255,.18), transparent 40%); opacity: 0; transition: opacity .3s; }
.exhibit:hover::after, .plan:hover::after { opacity: 1; }
.ex-tag { font-family: var(--mono); font-size: .72rem; color: var(--cyan); padding: 4px 10px; border: 1px solid rgba(56,225,255,.3); border-radius: 999px; display: inline-block; margin-bottom: 16px; }
.exhibit h3 { margin-bottom: 10px; }
.exhibit p { font-size: .93rem; margin: 0; }

/* CH5 SIMULATOR */
.sim { margin-top: 40px; border-radius: 24px; border: 1px solid var(--line); background: rgba(8,10,26,.72); backdrop-filter: blur(18px); overflow: hidden; box-shadow: 0 40px 120px -40px rgba(79,124,255,.4); }
.sim-tabs { display: flex; gap: 6px; padding: 12px; border-bottom: 1px solid var(--line); overflow-x: auto; scrollbar-width: none; }
.sim-tabs button { flex: 0 0 auto; border: 0; cursor: pointer; padding: 10px 16px; border-radius: 12px; background: transparent; color: var(--muted); font: 600 .88rem var(--font); transition: background .2s, color .2s; }
.sim-tabs button:hover { color: var(--ink); background: rgba(255,255,255,.04); }
.sim-tabs button[aria-selected="true"] { background: rgba(79,124,255,.18); color: #fff; box-shadow: inset 0 0 0 1px rgba(79,124,255,.5); }
.sim-body { display: grid; grid-template-columns: 1fr 1fr; gap: 0; }
.sim-list { padding: 28px; border-right: 1px solid var(--line); }
.sim-title { font-family: var(--mono); font-size: .8rem; color: var(--cyan); }
#simItems { list-style: none; padding: 0; margin: 0 0 24px; display: grid; gap: 8px; }
#simItems li { display: grid; grid-template-columns: 22px 1fr auto; gap: 12px; align-items: center; padding: 11px 14px; border-radius: 12px; background: rgba(255,255,255,.03); font-size: .92rem; color: var(--muted); opacity: 0; transform: translateX(-12px); transition: opacity .35s, transform .35s, background .35s, color .35s; }
#simItems li.show { opacity: 1; transform: none; }
#simItems li.ok { color: var(--ink); background: rgba(43,245,160,.07); }
#simItems li .chk { width: 22px; height: 22px; border-radius: 50%; border: 2px solid var(--dim); display: grid; place-items: center; font-size: .7rem; transition: all .3s; }
#simItems li.ok .chk { border-color: var(--green); background: var(--green); color: #032018; }
#simItems li .src { font-family: var(--mono); font-size: .7rem; color: var(--dim); }
.sim-meter-label { display: flex; justify-content: space-between; font-size: .85rem; color: var(--muted); margin-bottom: 8px; }
.sim-meter-label strong { color: var(--green); font-family: var(--mono); }
.sim-meter-track { height: 8px; border-radius: 8px; background: rgba(255,255,255,.06); overflow: hidden; }
.sim-meter-fill { height: 100%; width: 0; border-radius: 8px; background: linear-gradient(90deg, var(--amber), var(--green)); transition: width .5s cubic-bezier(.2,.7,.2,1); box-shadow: 0 0 16px rgba(43,245,160,.6); }
.sim-doc { padding: 28px; display: grid; place-items: center; perspective: 1000px; background: radial-gradient(circle at 50% 40%, rgba(79,124,255,.15), transparent 70%); }
.doc-page { width: min(330px, 100%); aspect-ratio: 8.5 / 11; background: #f4f6ff; color: #1a1f3a; border-radius: 6px; padding: 22px; position: relative; transform: rotateY(-14deg) rotateX(6deg); box-shadow: 30px 40px 80px -20px rgba(0,0,0,.8); transition: transform .6s; overflow: hidden; }
.sim-doc:hover .doc-page { transform: rotateY(0) rotateX(0); }
.doc-head { display: flex; gap: 10px; align-items: center; padding-bottom: 12px; border-bottom: 2px solid #dfe4ff; margin-bottom: 12px; }
.doc-head b { display: block; font-size: .85rem; }
.doc-head small { font-family: var(--mono); font-size: .58rem; color: #6a7299; }
.doc-logo { width: 26px; height: 30px; flex: 0 0 auto; background: var(--blue); clip-path: polygon(50% 0, 100% 15%, 100% 50%, 50% 100%, 0 50%, 0 15%); }
.doc-lines { display: grid; gap: 7px; }
.doc-line { display: grid; gap: 4px; opacity: 0; transform: translateY(6px); transition: opacity .3s, transform .3s; }
.doc-line.show { opacity: 1; transform: none; }
.doc-line b { font-size: .6rem; color: var(--blue); font-family: var(--mono); }
.doc-line i { display: block; height: 5px; border-radius: 3px; background: #d6dcf5; }
.doc-line i:nth-child(3) { width: 78%; }
.doc-stamp { position: absolute; right: 16px; bottom: 22px; transform: rotate(-12deg) scale(1.6); opacity: 0; font: 800 .8rem var(--mono); color: #0b9e66; border: 3px solid #0b9e66; padding: 6px 10px; border-radius: 6px; letter-spacing: .08em; transition: opacity .3s, transform .4s cubic-bezier(.3,1.6,.5,1); }
.doc-stamp.show { opacity: .9; transform: rotate(-12deg) scale(1); }

/* CH6 STEPS */
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.steps li { display: grid; grid-template-columns: 48px 1fr; gap: 18px; padding: 20px; border-radius: var(--radius); background: rgba(8,24,22,.55); border: 1px solid rgba(43,245,160,.18); backdrop-filter: blur(12px); }
.steps li > span { width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center; font: 800 1.1rem var(--mono); color: var(--green); background: rgba(43,245,160,.08); border: 1px solid rgba(43,245,160,.35); }
.steps b { display: block; margin-bottom: 4px; }
.steps p { margin: 0; font-size: .92rem; }

/* CH7 PLANS */
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; perspective: 1200px; align-items: stretch; }
.plan { padding: 34px 30px; display: flex; flex-direction: column; }
.plan h3 { font-size: 1.1rem; color: var(--muted); font-weight: 600; }
.plan .price { color: var(--ink); margin-bottom: 20px; }
.plan .price b { font-size: 3rem; letter-spacing: -0.04em; }
.plan ul { list-style: none; padding: 0; margin: 0 0 28px; display: grid; gap: 10px; flex: 1; }
.plan li { padding-left: 26px; position: relative; font-size: .94rem; color: #c3c9ea; }
.plan li::before { content: ""; position: absolute; left: 0; top: .45em; width: 14px; height: 8px; border-left: 2px solid var(--green); border-bottom: 2px solid var(--green); transform: rotate(-45deg); }
.plan.featured { border-color: rgba(79,124,255,.6); background: linear-gradient(160deg, rgba(45,60,140,.75), rgba(14,16,44,.8)); box-shadow: 0 40px 100px -40px rgba(79,124,255,.8); }
.badge { position: absolute; top: -12px; left: 30px; font: 700 .72rem var(--mono); padding: 5px 12px; border-radius: 999px; background: linear-gradient(90deg, var(--blue), var(--cyan)); color: #04102a; }

/* JOIN */
.join { min-height: 110vh; }
.join-form { max-width: 520px; margin: 40px auto 0; padding: 28px; border-radius: 24px; background: rgba(8,10,26,.75); border: 1px solid var(--line); backdrop-filter: blur(18px); text-align: left; display: grid; gap: 14px; }
.join-form input, .join-form select { width: 100%; padding: 15px 16px; border-radius: 12px; border: 1px solid var(--line); background: rgba(255,255,255,.04); color: var(--ink); font: 500 1rem var(--font); outline: none; transition: border-color .2s, box-shadow .2s; }
.join-form select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%); background-position: calc(100% - 20px) 50%, calc(100% - 15px) 50%; background-size: 5px 5px; background-repeat: no-repeat; padding-right: 36px; }
.join-form select option { background: #0b0e22; }
.join-form input:focus, .join-form select:focus { border-color: var(--blue); box-shadow: 0 0 0 4px rgba(79,124,255,.2); }
.join-selects { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.join-selects label span { display: block; font-size: .78rem; color: var(--dim); margin: 0 0 6px 4px; }
.form-msg { margin: 0; min-height: 1.4em; font-size: .9rem; text-align: center; }
.form-msg.ok { color: var(--green); }
.form-msg.err { color: var(--red); }

.footer { position: relative; z-index: 5; padding: 40px 0; border-top: 1px solid var(--line); background: rgba(5,6,15,.8); font-size: .85rem; }
.footer-inner { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.muted { color: var(--dim); }

.tooltip { position: fixed; z-index: 30; pointer-events: none; padding: 10px 14px; border-radius: 10px; background: rgba(10,12,30,.92); border: 1px solid rgba(255,181,71,.4); font: .8rem/1.4 var(--mono); color: #ffd394; opacity: 0; transform: translate(14px, 14px); transition: opacity .15s; max-width: 260px; }
.tooltip.show { opacity: 1; }
.tooltip b { display: block; color: #fff; margin-bottom: 2px; }

body.pointer { cursor: pointer; }

@media (max-width: 960px) {
  .nav-links { display: none; }
  .split { grid-template-columns: 1fr; }
  .exhibits, .plans { grid-template-columns: 1fr 1fr; }
  .sim-body { grid-template-columns: 1fr; }
  .sim-list { border-right: 0; border-bottom: 1px solid var(--line); }
  .progress { display: none; }
}
@media (max-width: 620px) {
  body { font-size: 16px; }
  .chapter { min-height: auto; padding: 16vh 0; }
  .hero { min-height: 100svh; }
  .exhibits, .plans { grid-template-columns: 1fr; }
  .join-selects { grid-template-columns: 1fr; }
  .mega-btn { width: 180px; height: 180px; }
  .nav .btn-small { padding: 9px 14px; font-size: .82rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { transition: none; opacity: 1; transform: none; filter: none; }
  .grain, .glitch::before, .glitch::after, .mega-ring, .pulse-dot { animation: none; }
}