:root {
  color-scheme: dark;
  --paper: oklch(94% 0.02 85);
  --paper-2: oklch(89% 0.03 85);
  --ink: oklch(19% 0.02 260);
  --ink-soft: oklch(40% 0.02 260);
  --night: oklch(16% 0.025 265);
  --night-2: oklch(22% 0.03 265);
  --maroon: oklch(40% 0.14 20);
  --maroon-hi: oklch(52% 0.18 22);
  --file: oklch(84% 0.15 88);
  --file-deep: oklch(72% 0.15 80);
  --ok: oklch(62% 0.14 155);
  --line: oklch(80% 0.03 85);
  --font-serif: "Shippori Mincho B1", "Hiragino Mincho ProN", serif;
  --font-display: "Dela Gothic One", "Hiragino Sans", sans-serif;
  --font-mono: "DotGothic16", "Hiragino Sans", monospace;
  --font-sans: "BIZ UDPGothic", "Hiragino Sans", system-ui, sans-serif;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --radius: 4px;
}
* { box-sizing: border-box; margin: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  background: var(--night);
  color: var(--paper);
  line-height: 1.85;
  min-height: 100dvh;
  background-image:
    radial-gradient(120% 60% at 50% -10%, oklch(30% 0.05 265 / .7), transparent 60%),
    repeating-linear-gradient(0deg, transparent 0 3px, oklch(100% 0 0 / .012) 3px 4px);
}
button, input { font: inherit; color: inherit; }
.app { max-width: 30rem; margin: 0 auto; min-height: 100dvh; display: flex; flex-direction: column; }

/* header */
.hud { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: .75rem;
  padding: .7rem 1rem; background: oklch(16% 0.025 265 / .92); backdrop-filter: blur(8px);
  border-bottom: 1px solid oklch(100% 0 0 / .08); font-size: .8rem; }
.badge { font-family: var(--font-display); font-weight: 400; background: var(--file); color: var(--ink);
  padding: .1rem .7rem; border-radius: 2px; letter-spacing: .08em; }
.hud .grow { flex: 1; }
.timer { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: .06em; opacity: .9; }
.timer.warn { color: var(--maroon-hi); font-weight: 700; }
.bar { position: absolute; left: 0; bottom: -1px; height: 2px; background: var(--maroon-hi);
  width: calc(var(--p, 0) * 100%); transition: width .5s var(--ease); }

/* stage */
.stage { flex: 1; padding: 1.75rem 1.25rem 7rem; animation: rise .5s var(--ease); }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } }
.eyebrow { font-family: var(--font-mono); font-size: .8rem; letter-spacing: .25em; color: var(--file); margin-bottom: .6rem; }
h1, h2 { font-family: var(--font-display); font-weight: 400; line-height: 1.4; letter-spacing: .02em; }
h1 { font-size: clamp(1.9rem, 1.4rem + 3vw, 2.6rem); }
h2 { font-size: 1.35rem; margin-bottom: 1rem; }
.stage p + p { margin-top: 1rem; }
.lead { font-family: var(--font-serif); font-weight: 500; font-size: 1.08rem; }
.dim { color: oklch(100% 0 0 / .55); font-size: .85rem; }

/* footer action */
.dock { position: fixed; left: 0; right: 0; bottom: 0; padding: 1rem 1.25rem calc(1rem + env(safe-area-inset-bottom));
  background: linear-gradient(transparent, var(--night) 40%); display: flex; justify-content: center; }
.btn { width: 100%; max-width: 27.5rem; border: 0; cursor: pointer; padding: .95rem 1rem; border-radius: var(--radius);
  background: var(--maroon); color: #fff; font-weight: 700; letter-spacing: .12em;
  box-shadow: 0 6px 0 oklch(28% 0.1 20), 0 14px 24px oklch(0% 0 0 / .4);
  transition: transform .15s var(--ease), box-shadow .15s var(--ease), background .2s; }
.btn:hover { background: var(--maroon-hi); }
.btn:active { transform: translateY(4px); box-shadow: 0 2px 0 oklch(28% 0.1 20); }
.btn:focus-visible, input:focus-visible, .choice:focus-visible, .card:focus-visible { outline: 3px solid var(--file); outline-offset: 3px; }
.btn.ghost { background: transparent; box-shadow: none; border: 1px solid oklch(100% 0 0 / .3); }
.btn.alt { background: var(--paper); color: var(--ink); box-shadow: 0 6px 0 var(--paper-2), 0 14px 24px oklch(0% 0 0 / .4); }
.btn[disabled] { opacity: .4; pointer-events: none; }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; width: 100%; max-width: 27.5rem; }

/* paper documents */
.doc { background: var(--paper); color: var(--ink); border-radius: var(--radius); margin-top: 1.25rem; position: relative;
  box-shadow: 0 1px 0 #fff inset, 0 18px 36px oklch(0% 0 0 / .45); padding: 1.5rem 1.15rem 1.25rem; }
.doc::before { font-family: var(--font-mono); content: attr(data-tag); position: absolute; top: -.85rem; left: 1rem; background: var(--file); color: var(--ink);
  font-size: .7rem; font-weight: 700; letter-spacing: .12em; padding: .15rem .8rem; border-radius: 3px 3px 0 0; }
.doc { font-family: var(--font-serif); }
.doc h3 { font-family: var(--font-serif); font-weight: 800; font-size: 1.12rem; padding-right: 3.6rem; border-bottom: 2px solid var(--ink); padding-bottom: .4rem; margin-bottom: .9rem; }
.doc h4 { font-size: .85rem; margin: 1.1rem 0 .4rem; color: var(--maroon); letter-spacing: .08em; }
.doc p, .doc li { font-size: .95rem; line-height: 1.8; }
.doc ul { padding-left: 1.2rem; }
.doc table { font-family: var(--font-mono); width: 100%; border-collapse: collapse; font-size: .85rem; margin: .5rem 0; font-variant-numeric: tabular-nums; }
.doc th, .doc td { border: 1px solid var(--line); padding: .35rem .5rem; text-align: left; }
.doc th { background: var(--paper-2); font-weight: 700; }
.doc tr.hl td { background: oklch(88% 0.1 88); font-weight: 700; }
.doc .stamp { font-family: var(--font-display); position: absolute; top: .9rem; right: .9rem; border: 2px solid var(--maroon); color: var(--maroon);
  font-weight: 400; font-size: .8rem; padding: .05rem .5rem; transform: rotate(6deg); opacity: .8; }
.testimony { border-left: 3px solid var(--maroon); padding: .1rem 0 .1rem .8rem; margin: .8rem 0; }
.testimony > b:first-child { display: block; font-size: .78rem; color: var(--maroon); letter-spacing: .08em; }
.photo { aspect-ratio: 16/9; display: grid; place-items: center; text-align: center; color: oklch(100% 0 0 / .8);
  background: repeating-linear-gradient(45deg, oklch(24% 0.02 265) 0 10px, oklch(21% 0.02 265) 10px 20px);
  font-size: .8rem; margin: .6rem 0; position: relative; }
.photo::after { content: "● REC"; position: absolute; top: .5rem; left: .6rem; font-size: .65rem; color: oklch(62% 0.22 25); letter-spacing: .1em; }
.photo small { display: block; opacity: .7; }

/* LINE chat */
.chat { background: oklch(80% 0.05 215); border-radius: var(--radius); padding: .8rem; display: grid; gap: .5rem; margin: .6rem 0; }
.chat .m { max-width: 82%; padding: .45rem .7rem; border-radius: 12px; font-size: .88rem; line-height: 1.55; background: #fff; justify-self: start; position: relative; }
.chat .m.me { background: oklch(86% 0.17 140); justify-self: end; }
.chat .m i { display: block; font-style: normal; font-size: .65rem; opacity: .6; }
.chat .read { justify-self: end; font-size: .65rem; opacity: .7; margin-top: -.2rem; }

/* people */
.cards { display: grid; gap: .75rem; margin-top: 1rem; }
.card { background: var(--night-2); border: 1px solid oklch(100% 0 0 / .1); border-radius: var(--radius); padding: .9rem 1rem;
  text-align: left; cursor: pointer; display: grid; grid-template-columns: 3.4rem 1fr; gap: .9rem; align-items: center; width: 100%; }
.card .face { width: 3.4rem; aspect-ratio: 1; border-radius: 50%; background: var(--paper-2); color: var(--ink);
  display: grid; place-items: center; font-family: var(--font-display); font-weight: 400; font-size: 1.3rem; }
.card strong { font-family: var(--font-display); font-weight: 400; font-size: 1.05rem; }
.card .role { font-size: .75rem; color: var(--file); }
.card .more { grid-column: 1 / -1; font-size: .88rem; line-height: 1.7; padding-top: .6rem; border-top: 1px dashed oklch(100% 0 0 / .2);
  color: oklch(100% 0 0 / .85); display: none; }
.card[aria-expanded="true"] .more { display: block; }
.card[aria-expanded="true"] { border-color: var(--file); }

/* gate */
.quiz { background: var(--night-2); border: 1px solid oklch(100% 0 0 / .12); border-radius: var(--radius); padding: 1.1rem; margin: 1rem 0; }
.quiz .q { font-family: var(--font-serif); font-weight: 700; font-size: 1.08rem; }
.quiz .ruby { font-family: var(--font-mono); display: block; margin-top: .6rem; font-size: 1.1rem; letter-spacing: .15em; color: var(--file); }
.hintbtn { margin-top: .8rem; background: none; border: 0; text-decoration: underline; cursor: pointer; font-size: .82rem; color: oklch(100% 0 0 / .7); padding: .4rem 0; }
.hint { margin-top: .4rem; font-size: .85rem; color: var(--file); }
.field { display: flex; gap: .5rem; margin-top: 1rem; }
.field input { flex: 1; min-width: 0; padding: .85rem 1rem; border-radius: var(--radius); border: 2px solid oklch(100% 0 0 / .25);
  background: var(--night); font-size: 1rem; }
.field input.bad { border-color: var(--maroon-hi); animation: shake .4s; }
@keyframes shake { 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } }
.msg { min-height: 1.6rem; margin-top: .5rem; font-size: .85rem; color: var(--maroon-hi); }
.msg.ok { color: var(--ok); }
.field .btn { width: auto; padding: .85rem 1.2rem; box-shadow: none; }
.unlocked { margin-top: 1rem; }

/* final */
.q3 { display: grid; gap: .6rem; list-style: none; padding: 0; margin: 1rem 0; counter-reset: q; }
.q3 li { counter-increment: q; background: var(--night-2); padding: .8rem 1rem .8rem 3rem; border-radius: var(--radius); position: relative; }
.q3 li::before { content: counter(q); position: absolute; left: .9rem; top: .75rem; width: 1.6rem; height: 1.6rem; border-radius: 50%;
  background: var(--file); color: var(--ink); display: grid; place-items: center; font-weight: 800; font-size: .85rem; }
.bigtimer { font-family: var(--font-mono); font-size: 3.4rem; text-align: center; font-variant-numeric: tabular-nums; margin: .5rem 0; }
.helpbox { display: flex; justify-content: space-between; align-items: center; font-size: .85rem; background: var(--night-2); padding: .7rem 1rem; border-radius: var(--radius); margin-top: 1rem; }
.helpbox button { border: 1px solid var(--file); background: none; padding: .35rem .8rem; border-radius: 99px; cursor: pointer; color: var(--file); }
.notice { background: oklch(24% 0.05 20); border-left: 3px solid var(--maroon-hi); padding: .8rem 1rem; font-size: .85rem; margin-top: 1.25rem; border-radius: 0 var(--radius) var(--radius) 0; }
.qlist { padding-left: 1.2rem; display: grid; gap: .4rem; }
.slogan { font-family: var(--font-display); font-size: 1.6rem; font-weight: 400; text-align: center; margin: 2rem 0; line-height: 1.5; }
.slogan span { color: var(--file); }
.reflection { display: grid; gap: .6rem; margin-top: 1rem; }
.choice { text-align: left; padding: 1rem; border-radius: var(--radius); background: var(--night-2); border: 1px solid oklch(100% 0 0 / .15); cursor: pointer; }
.choice[aria-pressed="true"] { border-color: var(--file); background: oklch(26% 0.05 85); }

/* index */
.hero { padding: 3rem 1.25rem 1rem; }
.hero .mark { font-family: var(--font-display); font-weight: 400; font-size: clamp(3.4rem, 2rem + 9vw, 5rem); line-height: 1; letter-spacing: .06em; }
.hero .mark span { color: var(--maroon-hi); }
.facts { display: grid; grid-template-columns: auto 1fr; gap: .4rem 1rem; font-size: .9rem; margin-top: 1.5rem; padding: 1rem 0;
  border-block: 1px solid oklch(100% 0 0 / .15); }
.facts dt { color: var(--file); font-size: .75rem; letter-spacing: .12em; padding-top: .2rem; }
.facts dd { margin: 0; }
.routes { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; margin-top: 1.25rem; }
.route { text-align: center; padding: 1.4rem .5rem; border-radius: var(--radius); background: var(--paper); color: var(--ink); text-decoration: none;
  font-family: var(--font-display); font-weight: 400; font-size: 2.8rem; line-height: 1.1; cursor: pointer; border: 0;
  box-shadow: 0 6px 0 var(--paper-2); transition: transform .15s var(--ease), box-shadow .15s; }
.route small { display: block; font-family: var(--font-sans); font-size: .7rem; font-weight: 500; letter-spacing: .1em; color: var(--ink-soft); margin-top: .4rem; }
.route:active { transform: translateY(4px); box-shadow: 0 2px 0 var(--paper-2); }

@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }

/* images and evidence archive */
.shot { margin: .8rem 0; }
.shot img { display: block; width: 100%; height: auto; border-radius: 2px; box-shadow: 0 0 0 1px oklch(0% 0 0 / .4); }
.shot figcaption { font-family: var(--font-mono); font-size: .75rem; color: var(--ink-soft); margin-top: .3rem; }
.archive { margin-top: 2rem; }
.archive details { background: var(--night-2); border: 1px solid oklch(100% 0 0 / .12); border-radius: var(--radius); margin-top: .6rem; }
.archive summary { cursor: pointer; padding: .8rem 1rem; font-family: var(--font-serif); font-weight: 800; font-size: 1rem; list-style: none; display: flex; justify-content: space-between; gap: 1rem; }
.archive summary::after { content: "＋"; color: var(--file); }
.archive details[open] summary::after { content: "－"; }
.archive summary small { font-family: var(--font-mono); color: var(--file); font-size: .72rem; align-self: center; }
.archive .inner { padding: 0 .9rem 1rem; }
.archive .doc { margin-top: 1.5rem; }
.empty { color: oklch(100% 0 0 / .6); font-size: .9rem; }
.pass { font-family: var(--font-mono); letter-spacing: .1em; }