:root {
  --ambient-energy: .2;
  --ambient-low: .2;
  --ambient-mid: .2;
  --ambient-high: .2;
  --line-fine: rgba(242,238,231,.12);
}

body::before {
  content: "";
  position: fixed;
  z-index: 0;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at calc(50% + 22vw) calc(45% + 10vh), rgba(121,181,165,calc(.04 + var(--ambient-energy) * .12)), transparent 34%);
  transition: background 1.4s ease;
}

main { position: relative; z-index: 1; }
.ambient-canvas { position: fixed; z-index: 2; inset: 0; width: 100%; height: 100%; pointer-events: none; opacity: .78; mix-blend-mode: screen; }
.voice-chapter { isolation: isolate; }
.voice-chapter::before, .voice-chapter::after { z-index: 0; pointer-events: none; }
.voice-chapter > * { position: relative; z-index: 4; }
.voice-chapter > .back-canvas { z-index: 1; pointer-events: none; opacity: .38; }

.opening-chapter {
  background-color: #0d1415;
  background-image:
    radial-gradient(circle at 74% 38%, rgba(121,181,165,.18), transparent 25%),
    radial-gradient(circle at 18% 78%, rgba(226,181,104,.07), transparent 27%),
    linear-gradient(118deg, rgba(13,20,21,.98), rgba(18,31,30,.76)),
    url("../generated/topographic_lines.svg");
  background-size: auto, auto, auto, 960px 680px;
  background-position: center, center, center, 42% 48%;
}
.opening-chapter::before {
  opacity: .6;
  background: linear-gradient(100deg, transparent 15%, rgba(121,181,165,.08) 47%, transparent 80%), url("../generated/river_noise.png");
  background-size: auto, 720px 720px;
  mix-blend-mode: screen;
}
.opening-chapter::after {
  opacity: .65;
  background: radial-gradient(ellipse at 50% 52%, transparent 15%, rgba(6,12,13,.4) 73%), linear-gradient(90deg, transparent, rgba(237,101,79,.06));
}
.opening-chapter .opening-copy { text-shadow: 0 12px 45px rgba(0,0,0,.24); }
.origin-coordinates { position: absolute; z-index: 4; right: 7vw; top: 30%; display: grid; gap: 5px; color: rgba(242,238,231,.42); font: 9px var(--mono); letter-spacing: .16em; }
.origin-coordinates::before { content: ""; width: 38px; height: 1px; margin-bottom: 4px; background: var(--coral); }
.start-choices { display: flex; align-items: center; justify-content: center; gap: 20px; margin-top: 36px; }
.start-choices .start-button { margin-top: 0; }
.guided-button { color: var(--paper); background: transparent; border-bottom: 1px solid rgba(242,238,231,.5); padding: 12px 2px 9px; font: 10px var(--mono); letter-spacing: .16em; }

.river-chapter {
  color: var(--paper);
  background-color: #12302d;
  background-image:
    radial-gradient(circle at 22% 20%, rgba(226,181,104,.11), transparent 24%),
    linear-gradient(180deg, rgba(11,35,34,.92), rgba(15,51,48,.76) 47%, rgba(9,29,31,.98)),
    url("../generated/topographic_lines.svg"),
    url("../generated/river_noise.png");
  background-size: auto, auto, 1200px 840px, 680px 680px;
  background-position: center, center, 65% 32%, 30% 68%;
}
.river-chapter::before {
  opacity: .7;
  background: linear-gradient(110deg, transparent 12%, rgba(121,181,165,.12), transparent 82%), url("../generated/sound_grid.svg");
  background-size: auto, 720px 720px;
  mix-blend-mode: screen;
}
.river-chapter::after {
  opacity: .8;
  background: linear-gradient(180deg, transparent 50%, rgba(5,18,20,.55)), radial-gradient(ellipse at 50% 70%, transparent 0 18%, rgba(226,181,104,.08) 55%, transparent 72%);
}
.river-stage { z-index: 3; }
.river-stage::after { content: ""; position: absolute; inset: -24px 0; border-top: 1px solid rgba(226,181,104,.12); border-bottom: 1px solid rgba(121,181,165,.18); background: linear-gradient(90deg, transparent, rgba(121,181,165,.06), transparent); pointer-events: none; }
.river-svg { z-index: 3; }
.river-trace { filter: drop-shadow(0 0 8px rgba(121,181,165,.28)); }
.river-atmosphere-note { position: absolute; top: 20px; right: 5%; color: rgba(242,238,231,.42); font: 9px var(--mono); letter-spacing: .15em; }
.river-atmosphere-note b { color: var(--gold); font-weight: 400; }
.river-time { position: relative; }
.river-time::before { content: "SOUND HORIZON / 24H"; position: absolute; right: 0; bottom: calc(100% + 12px); color: rgba(242,238,231,.36); font: 8px var(--mono); letter-spacing: .17em; }
.time-scale { position: relative; }
.time-scale::before { content: ""; position: absolute; top: 2px; right: 0; left: 0; height: 1px; background: linear-gradient(90deg, var(--jade), var(--gold), var(--coral), var(--blue), var(--jade)); opacity: .38; }

.human-chapter {
  background-color: #e5ddd1;
  background-image:
    radial-gradient(circle at 80% 25%, rgba(237,101,79,.1), transparent 22%),
    linear-gradient(105deg, rgba(242,238,231,.9), rgba(226,218,205,.82)),
    url("../generated/field_dots.svg");
  background-size: auto, auto, 680px 680px;
}
.human-chapter::before {
  opacity: .72;
  background: linear-gradient(90deg, rgba(121,181,165,.08), transparent 42%, rgba(226,181,104,.12)), url("../generated/topographic_lines.svg");
  background-size: auto, 1100px 760px;
  mix-blend-mode: multiply;
}
.human-chapter::after { opacity: .4; background: linear-gradient(180deg, transparent 40%, rgba(242,238,231,.85)); }
.human-photo { clip-path: polygon(6% 0, 100% 8%, 94% 100%, 0 92%); filter: grayscale(.4) contrast(1.04); transition: filter .6s, clip-path .6s, transform .6s; box-shadow: 0 18px 38px rgba(45,51,45,.18); }
.human-photo:hover { filter: grayscale(0) contrast(1.08); clip-path: polygon(0 4%, 96% 0, 100% 94%, 4% 100%); transform: rotate(-2deg) scale(1.05); }
.human-photo::after { content: "ARCHIVE / 03"; position: absolute; top: 10px; left: 10px; color: var(--paper); font: 8px var(--mono); letter-spacing: .12em; text-shadow: 0 1px 8px #111; }
.memory-fragments { position: absolute; right: 25%; bottom: 150px; display: flex; align-items: end; gap: 13px; pointer-events: none; }
.memory-fragment { position: relative; overflow: hidden; width: 82px; height: 116px; border: 1px solid rgba(17,22,25,.18); box-shadow: 8px 12px 0 rgba(17,22,25,.06); transform: rotate(-5deg); }
.memory-fragment:nth-child(2) { width: 118px; height: 80px; transform: rotate(3deg) translateY(8px); }
.memory-fragment:nth-child(3) { width: 67px; height: 96px; transform: rotate(7deg) translateY(-4px); }
.memory-fragment img { width: 100%; height: 100%; object-fit: cover; filter: grayscale(.7) saturate(.5); mix-blend-mode: multiply; }
.memory-fragment span { position: absolute; right: 5px; bottom: 5px; color: rgba(17,22,25,.72); font: 7px var(--mono); }
.archive-action { display: inline-flex; align-items: center; gap: 12px; margin-top: 19px; padding: 9px 0; border-bottom: 1px solid var(--coral); color: var(--ink); background: transparent; font: 10px var(--mono); letter-spacing: .13em; }
.archive-action i { color: var(--coral); font-style: normal; }

.ancient-chapter {
  background-color: #262522;
  background-image:
    radial-gradient(circle at 57% 43%, rgba(226,181,104,.14), transparent 25%),
    linear-gradient(112deg, rgba(31,31,29,.98), rgba(45,40,34,.8)),
    url("../generated/paper_grain.png"),
    url("../generated/topographic_lines.svg");
  background-size: auto, auto, 540px 540px, 880px 660px;
  background-blend-mode: screen, normal, soft-light, screen;
}
.ancient-chapter::before { opacity: .55; background: url("../generated/ink_particles.svg") center/820px 620px; mix-blend-mode: screen; }
.ancient-chapter::after { opacity: .32; background: linear-gradient(90deg, rgba(237,101,79,.1), transparent 16%, transparent 83%, rgba(226,181,104,.08)); }
.ancient-lab { position: relative; }
.ancient-lab::before { content: ""; position: absolute; z-index: -1; inset: -28px -4vw; border: 1px solid rgba(226,181,104,.1); background: repeating-linear-gradient(90deg, transparent 0 38px, rgba(226,181,104,.05) 39px 40px); pointer-events: none; }
.pattern-space { background-image: linear-gradient(rgba(226,181,104,.04) 1px, transparent 1px), linear-gradient(90deg, rgba(226,181,104,.04) 1px, transparent 1px), radial-gradient(circle at center, rgba(226,181,104,.12), transparent 56%); background-size: 32px 32px, 32px 32px, auto; }
.evolution-panel { display: grid; grid-template-columns: 1fr auto; gap: 12px 20px; align-items: center; margin-top: 30px; padding: 17px 20px; border: 1px solid rgba(226,181,104,.18); background: rgba(16,18,17,.3); }
.evolution-panel > div:first-child { display: grid; gap: 4px; }
.evolution-panel strong { color: var(--paper); font: 14px var(--serif); font-weight: 400; }
.evolution-panel small { color: var(--gold); font: 8px var(--mono); letter-spacing: .13em; }
.evolution-panel input { grid-column: 1 / -1; accent-color: var(--coral); }
.evolution-toggle { padding: 8px 0; border-bottom: 1px solid var(--coral); color: var(--paper); background: transparent; font: 9px var(--mono); letter-spacing: .12em; }
.imprint-trail { position: absolute; z-index: 1; right: 9%; bottom: 8%; width: 220px; height: 120px; opacity: .32; border: 1px solid rgba(226,181,104,.18); transform: rotate(-8deg); background: repeating-linear-gradient(135deg, transparent 0 9px, rgba(226,181,104,.12) 10px 11px); pointer-events: none; }

.new-chapter {
  background-color: #10171c;
  background-image:
    radial-gradient(circle at 78% 58%, rgba(135,159,197,.18), transparent 27%),
    linear-gradient(116deg, rgba(11,18,21,.98), rgba(22,31,43,.78)),
    url("../generated/rail_tracks.svg"),
    url("../generated/sound_grid.svg");
  background-size: auto, auto, 1200px 760px, 720px 720px;
  background-position: center, center, 52% 100%, 50% 50%;
}
.new-chapter::before { opacity: .48; background: linear-gradient(90deg, rgba(135,159,197,.1), transparent 66%), url("../generated/field_dots.svg"); background-size: auto, 720px 720px; mix-blend-mode: screen; }
.new-chapter::after { opacity: .62; background: linear-gradient(90deg, rgba(16,22,25,.9), transparent 55%), radial-gradient(ellipse at 86% 70%, transparent 0 13%, rgba(135,159,197,.08) 46%, transparent 73%); }
.new-sounds .sound-line { position: relative; }
.new-sounds .sound-line::after { content: "↗"; position: absolute; right: 0; color: var(--blue); opacity: .5; transform: translateX(-6px); transition: transform .3s; }
.new-sounds .sound-line:hover::after, .new-sounds .sound-line.is-active::after { transform: translateX(0); }
.compare-action { display: inline-flex; align-items: center; gap: 12px; padding: 9px 0; border-bottom: 1px solid var(--blue); color: var(--paper); background: transparent; font: 9px var(--mono); letter-spacing: .14em; }

.resonance-chapter {
  background-color: #1b2a2a;
  background-image:
    radial-gradient(circle at 32% 30%, rgba(121,181,165,.17), transparent 28%),
    linear-gradient(120deg, rgba(19,37,36,.98), rgba(29,47,45,.8)),
    url("../generated/sound_grid.svg"),
    url("../generated/topographic_lines.svg");
  background-size: auto, auto, 720px 720px, 1100px 760px;
}
.resonance-chapter::before { opacity: .42; background: repeating-linear-gradient(0deg, transparent 0 38px, rgba(121,181,165,.07) 39px 40px), repeating-linear-gradient(90deg, transparent 0 38px, rgba(121,181,165,.05) 39px 40px); }
.resonance-chapter::after { opacity: .6; background: radial-gradient(circle at 68% 70%, rgba(237,101,79,.12), transparent 26%), linear-gradient(180deg, transparent, rgba(10,22,22,.42)); }
.microscope-lab { background-image: linear-gradient(rgba(121,181,165,.045) 1px, transparent 1px), linear-gradient(90deg, rgba(121,181,165,.045) 1px, transparent 1px), radial-gradient(circle at center, rgba(121,181,165,.1), transparent 54%); background-size: 32px 32px, 32px 32px, auto; }
.microscope-lab::before { content: "0  —  2KHz  —  8KHz  —  16KHz"; position: absolute; top: 64px; left: 24px; color: rgba(121,181,165,.36); font: 8px var(--mono); letter-spacing: .1em; }
.microscope-lab::after { content: ""; position: absolute; top: 18%; bottom: 18%; left: 50%; width: 1px; background: linear-gradient(transparent, rgba(237,101,79,.38), transparent); opacity: .7; pointer-events: none; animation: scanLine 5s ease-in-out infinite; }
.live-echo-card { margin-top: 20px; padding: 15px 17px; border-left: 1px solid var(--coral); background: rgba(17,22,25,.14); }
.live-echo-card > span { color: var(--coral); font: 9px var(--mono); letter-spacing: .14em; }
.live-echo-card p { margin: 6px 0 11px; color: #a6b4aa; font: 12px/1.7 var(--serif); }
.live-echo-card button { padding: 7px 0; border-bottom: 1px solid var(--coral); color: var(--paper); background: transparent; font: 10px var(--mono); }

.epilogue-chapter {
  background-color: #12151d;
  background-image:
    radial-gradient(circle at 53% 42%, rgba(170,163,199,.12), transparent 27%),
    linear-gradient(110deg, rgba(13,17,24,.98), rgba(27,26,39,.74)),
    url("../generated/field_dots.svg"),
    url("../generated/topographic_lines.svg");
  background-size: auto, auto, 720px 720px, 1100px 760px;
}
.epilogue-chapter::before { opacity: .5; background: radial-gradient(circle at 50% 50%, rgba(170,163,199,.1), transparent 48%), url("../generated/ink_particles.svg") center/850px 650px; mix-blend-mode: screen; }
.epilogue-chapter::after { opacity: .55; background: radial-gradient(circle at center, transparent 0 19%, rgba(12,15,22,.15) 45%, rgba(12,15,22,.85) 100%); }
.memory-constellation { position: absolute; z-index: 2; inset: 16% 8% 14%; pointer-events: none; }
.memory-node { position: absolute; width: 7px; height: 7px; border-radius: 50%; background: var(--gold); box-shadow: 0 0 0 5px rgba(226,181,104,.08), 0 0 22px rgba(226,181,104,.4); animation: starPulse 4.8s ease-in-out infinite; }
.memory-node::after { content: attr(data-label); position: absolute; top: 13px; left: 9px; color: rgba(242,238,231,.55); font: 7px var(--mono); letter-spacing: .08em; white-space: nowrap; }
.memory-node.is-memory { width: 10px; height: 10px; background: var(--coral); }
.memory-node.is-memory::before { content: ""; position: absolute; left: 2px; top: 2px; width: 180px; height: 1px; background: linear-gradient(90deg, rgba(237,101,79,.5), transparent); transform-origin: left; transform: rotate(-19deg); }

.sound-river-progress { position: fixed; z-index: 61; top: 73px; left: 0; width: 100%; height: 2px; pointer-events: none; }
.sound-river-progress::before { content: ""; position: absolute; inset: 0; background: rgba(242,238,231,.12); }
.sound-river-progress span { position: absolute; inset: 0 auto 0 0; width: 0; background: linear-gradient(90deg, var(--jade), var(--gold), var(--coral)); box-shadow: 0 0 12px rgba(121,181,165,.45); transition: width .3s ease; }
.sound-river-progress i { position: absolute; top: -2px; left: 0; width: 6px; height: 6px; border: 1px solid var(--paper); border-radius: 50%; background: var(--coral); transform: translateX(-3px); transition: left .3s ease; }
.chapter-state { display: inline-flex; align-items: center; gap: 7px; justify-self: end; color: var(--muted); font: 8px var(--mono); letter-spacing: .08em; }
.chapter-state i { width: 5px; height: 5px; border: 1px solid currentColor; border-radius: 50%; }
.chapter-state.is-visited i { background: var(--jade); border-color: var(--jade); }
.chapter-state.is-played::after { content: "◌"; color: var(--coral); font-size: 11px; }

.action-magnetic { transition: transform .24s var(--ease), color .24s, border-color .24s, background .24s; }
.action-magnetic:hover { transform: translate3d(var(--mag-x, 0px), -3px, 0); }
.action-magnetic:active { transform: scale(.97); }

.enhancement-overlay { position: fixed; z-index: 105; inset: 0; display: grid; place-items: center; padding: 22px; color: var(--paper); background: rgba(8,13,14,.88); opacity: 0; visibility: hidden; transition: opacity .4s, visibility .4s; }
.enhancement-overlay.is-open { opacity: 1; visibility: visible; }
.enhancement-panel { position: relative; width: min(1120px, 100%); max-height: min(86vh, 900px); overflow: auto; padding: 34px; border: 1px solid rgba(242,238,231,.17); background: linear-gradient(120deg, rgba(29,43,42,.98), rgba(16,23,27,.98)); box-shadow: 0 30px 100px rgba(0,0,0,.38); }
.enhancement-panel::before { content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .25; background: url("../generated/sound_grid.svg") center/620px; }
.enhancement-panel > * { position: relative; z-index: 1; }
.overlay-kicker { color: var(--jade); font: 9px var(--mono); letter-spacing: .2em; }
.overlay-title { display: flex; align-items: end; justify-content: space-between; gap: 25px; margin: 11px 0 24px; }
.overlay-title h2 { margin: 0; font: 46px/1.1 var(--serif); font-weight: 400; }
.overlay-title p { max-width: 320px; margin: 0; color: #93a097; font: 12px/1.75 var(--serif); }
.overlay-close { position: absolute; z-index: 4; top: 20px; right: 24px; padding: 0; color: var(--paper); background: transparent; font: 25px var(--sans); }
.archive-toolbar { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.filter-chip { padding: 7px 11px; border: 1px solid rgba(242,238,231,.18); color: #9ba79e; background: transparent; font: 9px var(--mono); letter-spacing: .1em; transition: .25s; }
.filter-chip:hover, .filter-chip.is-active { border-color: var(--coral); color: var(--paper); background: rgba(237,101,79,.1); }
.archive-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 25px; }
.archive-list { display: grid; max-height: 49vh; overflow: auto; border-top: 1px solid rgba(242,238,231,.14); }
.archive-item { display: grid; grid-template-columns: 32px 1fr auto; gap: 13px; align-items: center; padding: 14px 10px; border-bottom: 1px solid rgba(242,238,231,.1); color: var(--paper); background: transparent; text-align: left; }
.archive-item:hover, .archive-item.is-active { background: rgba(121,181,165,.09); }
.archive-item > b { color: var(--coral); font: 10px var(--mono); font-weight: 400; }
.archive-item strong { display: block; font: 19px var(--serif); font-weight: 400; }
.archive-item small { color: #8d9a91; font: 9px var(--mono); letter-spacing: .06em; }
.archive-wave { display: flex; align-items: center; gap: 2px; height: 26px; }
.archive-wave i { width: 2px; height: var(--h); background: var(--jade); opacity: .65; }
.archive-detail { min-height: 310px; padding: 24px; border: 1px solid rgba(242,238,231,.14); background: rgba(7,13,14,.24); }
.archive-detail figure { position: relative; height: 150px; margin: 0 0 21px; overflow: hidden; }
.archive-detail figure img { width: 100%; height: 100%; object-fit: cover; filter: saturate(.58) contrast(1.12); }
.archive-detail figure::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(7,13,14,.5), transparent 50%, rgba(237,101,79,.12)); }
.archive-detail h3 { margin: 0; font: 28px var(--serif); font-weight: 400; }
.archive-detail p { margin: 10px 0 17px; color: #a3afa6; font: 12px/1.8 var(--serif); }
.archive-meta { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 18px; color: #87958c; font: 8px var(--mono); letter-spacing: .08em; }
.archive-meta b { color: var(--coral); font-weight: 400; }
.archive-play { margin-top: 20px; padding: 8px 0; border-bottom: 1px solid var(--coral); color: var(--paper); background: transparent; font: 10px var(--mono); }

.compare-layout { display: grid; grid-template-columns: 1fr 70px 1fr; gap: 18px; align-items: stretch; }
.compare-voice { padding: 21px; border: 1px solid rgba(242,238,231,.14); background: rgba(7,13,14,.22); }
.compare-voice.is-b { border-color: rgba(135,159,197,.32); }
.compare-voice h3 { margin: 9px 0 3px; font: 27px var(--serif); font-weight: 400; }
.compare-voice p { margin: 0 0 18px; color: #84928a; font: 9px var(--mono); letter-spacing: .08em; }
.compare-select { display: grid; gap: 8px; }
.compare-select button { padding: 8px 0; border-bottom: 1px solid rgba(242,238,231,.13); color: #98a49c; background: transparent; text-align: left; font: 10px var(--mono); }
.compare-select button:hover, .compare-select button.is-active { color: var(--paper); border-color: var(--coral); }
.compare-wave { height: 130px; margin: 10px 0 18px; border-top: 1px solid rgba(242,238,231,.12); border-bottom: 1px solid rgba(242,238,231,.12); }
.compare-wave canvas { width: 100%; height: 100%; }
.compare-metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 4px; }
.compare-metrics div { padding-top: 8px; border-top: 1px solid rgba(242,238,231,.12); }
.compare-metrics b { display: block; color: #84928a; font: 8px var(--mono); }
.compare-metrics strong { color: var(--paper); font: 18px var(--serif); font-weight: 400; }
.compare-mix { display: grid; align-content: center; justify-items: center; gap: 12px; }
.compare-mix span { color: var(--jade); font: 8px var(--mono); letter-spacing: .14em; writing-mode: vertical-rl; }
.compare-mix input { width: 130px; accent-color: var(--coral); transform: rotate(-90deg); }
.compare-mix small { color: #99a49c; font: 9px var(--mono); }
.compare-fusion { margin-top: 21px; padding-top: 16px; border-top: 1px solid rgba(242,238,231,.14); text-align: center; }
.compare-fusion span { color: var(--gold); font: 9px var(--mono); letter-spacing: .17em; }
.compare-fusion canvas { display: block; width: 100%; height: 100px; margin-top: 5px; }

.live-panel { display: grid; grid-template-columns: 1.2fr .8fr; gap: 25px; align-items: center; }
.live-visual { position: relative; min-height: 360px; border: 1px solid rgba(121,181,165,.22); background-image: linear-gradient(rgba(121,181,165,.05) 1px, transparent 1px), linear-gradient(90deg, rgba(121,181,165,.05) 1px, transparent 1px); background-size: 28px 28px; }
.live-visual canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.live-note { padding: 25px; border-left: 1px solid var(--coral); background: rgba(7,13,14,.22); }
.live-note h3 { margin: 0 0 10px; font: 31px var(--serif); font-weight: 400; }
.live-note p { color: #a2aea5; font: 13px/1.9 var(--serif); }
.live-note small { display: block; margin: 21px 0; color: var(--jade); font: 9px/1.7 var(--mono); }
.live-status { min-height: 30px; color: var(--gold); font: 10px/1.6 var(--mono); }
.live-actions { display: flex; gap: 17px; align-items: center; }
.live-actions button { padding: 9px 0; border-bottom: 1px solid var(--coral); color: var(--paper); background: transparent; font: 10px var(--mono); }
.live-actions button.secondary { border-color: rgba(242,238,231,.3); color: #a4afa6; }

.guided-overlay { align-items: end; padding: 0; background: rgba(7,12,13,.73); }
.guided-panel { width: 100%; padding: 22px 7vw 26px; border-top: 1px solid rgba(121,181,165,.3); background: rgba(17,27,27,.94); transform: translateY(100%); transition: transform .6s var(--ease); }
.guided-overlay.is-open .guided-panel { transform: translateY(0); }
.guided-panel-top { display: flex; align-items: center; justify-content: space-between; gap: 22px; }
.guided-panel-top span { color: var(--jade); font: 9px var(--mono); letter-spacing: .18em; }
.guided-panel-top strong { color: var(--paper); font: 20px var(--serif); font-weight: 400; }
.guided-progress { position: relative; height: 2px; margin-top: 18px; background: rgba(242,238,231,.16); }
.guided-progress span { position: absolute; inset: 0 auto 0 0; width: 0; background: var(--coral); transition: width .6s ease; }
.guided-exit { padding: 7px 0; color: #a2afa5; background: transparent; font: 9px var(--mono); }

@keyframes scanLine { 0%, 100% { transform: translateY(-10%); opacity: .2; } 50% { transform: translateY(10%); opacity: .8; } }
@keyframes starPulse { 0%, 100% { opacity: .35; transform: scale(.75); } 50% { opacity: .95; transform: scale(1); } }

@media (max-width: 680px) {
  .ambient-canvas { opacity: .38; }
  .origin-coordinates { top: 25%; right: 18px; font-size: 7px; }
  .start-choices { flex-direction: column; gap: 10px; margin-top: 25px; }
  .start-choices .start-button { padding: 13px 18px; }
  .opening-chapter { background-size: auto, auto, auto, 720px 520px; }
  .river-chapter { background-size: auto, auto, 750px 620px, 520px 520px; }
  .river-time::before { left: 0; right: auto; }
  .memory-fragments { right: 22px; bottom: 210px; transform: scale(.72); transform-origin: right bottom; }
  .human-photo { z-index: 5; }
  .evolution-panel { margin-top: 20px; padding: 14px; }
  .ancient-lab::before { inset: -18px 0; }
  .enhancement-overlay { padding: 10px; }
  .enhancement-panel { max-height: 92vh; padding: 25px 16px 20px; }
  .overlay-title { display: block; margin-bottom: 17px; }
  .overlay-title h2 { font-size: 35px; }
  .overlay-title p { margin-top: 8px; font-size: 11px; }
  .archive-grid, .live-panel { grid-template-columns: 1fr; gap: 14px; }
  .archive-list { max-height: 34vh; }
  .archive-detail { min-height: 0; padding: 16px; }
  .archive-detail figure { height: 110px; margin-bottom: 14px; }
  .compare-layout { grid-template-columns: 1fr; gap: 10px; }
  .compare-mix { grid-template-columns: 1fr auto 1fr; display: grid; min-height: 64px; }
  .compare-mix span { writing-mode: horizontal-tb; }
  .compare-mix input { width: 100%; transform: none; }
  .compare-fusion canvas { height: 72px; }
  .live-visual { min-height: 240px; }
  .guided-panel { padding: 18px; }
  .guided-panel-top strong { font-size: 16px; }
  .chapter-state { font-size: 7px; }
}

@media (prefers-reduced-motion: reduce) {
  .ambient-canvas { opacity: .18; }
  .microscope-lab::after, .memory-node { animation: none; }
}