:root {
  --paper: #f5eee2;
  --paper-deep: #efe5d4;
  --card: #fffdf6;
  --ink: #241f19;
  --ink-soft: #6f6455;
  --ink-faint: #a2937c;
  --rule: #d9ccb6;
  --accent: #a8481f;
  --accent-soft: #f2ded0;
  --ok: #4b6b46;
  --bad: #a13426;
  --serif: "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", "SimSun", Georgia, serif;
  --sans: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  color-scheme: light;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background-color: var(--paper);
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='140' height='140'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix type='saturate' values='0'/></filter><rect width='140' height='140' filter='url(%23n)' opacity='0.045'/></svg>");
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
}

/* ---------- 顶栏 ---------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px clamp(20px, 6vw, 64px);
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--ink-soft);
}

.back {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.back:hover { border-bottom-color: var(--ink-soft); }

.folio {
  font-variant-numeric: tabular-nums;
  letter-spacing: .18em;
  color: var(--ink-faint);
}

/* ---------- 版面 ---------- */

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 clamp(20px, 6vw, 40px) 64px;
}

.screen {
  display: none;
  animation: rise .45s ease both;
}

.screen.is-active { display: block; }

@keyframes rise {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.kicker {
  margin: 0 0 10px;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.kicker.small { margin-bottom: 6px; }

h1 {
  margin: 0 0 18px;
  font-size: clamp(2.6rem, 9vw, 4.2rem);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: .01em;
}

h2 {
  margin: 0 0 20px;
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 500;
}

.lede {
  margin: 0 0 40px;
  max-width: 30em;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.lede em {
  font-style: normal;
  border-bottom: 1px solid var(--accent);
  color: var(--ink);
}

/* ---------- 封面说明 ---------- */

.howto {
  display: grid;
  gap: 14px;
  margin: 0 0 36px;
  padding: 22px 24px;
  border: 1px solid var(--rule);
  border-radius: 3px;
  background: rgba(255, 253, 246, .6);
}

.howto-item {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.howto-item .num {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--accent);
  border: 1px solid currentColor;
  border-radius: 50%;
  width: 20px;
  height: 20px;
  display: grid;
  place-items: center;
  flex: none;
  transform: translateY(-2px);
}

.howto-item p { margin: 0; font-size: .95rem; color: var(--ink-soft); }

/* ---------- 按钮 ---------- */

.btn {
  font-family: var(--sans);
  font-size: 14px;
  letter-spacing: .08em;
  padding: 12px 26px;
  border-radius: 2px;
  cursor: pointer;
  transition: transform .12s ease, background-color .15s ease, color .15s ease;
}

.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
}
.btn-primary:hover { background: #3a3229; }

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink);
}
.btn-ghost:hover { background: var(--ink); color: var(--paper); }

.fineprint {
  margin: 18px 0 0;
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink-faint);
  letter-spacing: .04em;
}

/* ---------- 进度 ---------- */

.progress {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 34px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--ink-faint);
}

.dots { display: flex; gap: 8px; }

.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  border: 1px solid var(--ink-faint);
  background: transparent;
}
.dot.done { background: var(--ink); border-color: var(--ink); }

/* ---------- 句子 ---------- */

.sentence-wrap {
  position: relative;
  text-align: center;
  padding: 18px 0 6px;
}

.quote-mark {
  margin: 0;
  font-size: 4rem;
  line-height: .6;
  color: #d3c4a9;
  height: .55em;
}
.quote-mark.close { transform: rotate(180deg); }

.sentence {
  margin: 6px 0 10px;
  font-size: clamp(1.7rem, 5.4vw, 2.9rem);
  line-height: 1.35;
  letter-spacing: .02em;
}

.instruction {
  margin: 4px 0 30px;
  text-align: center;
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--ink-soft);
}

/* ---------- 场景 ---------- */

.scenes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.scene {
  display: grid;
  gap: 12px;
  padding: 16px 16px 14px;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 3px;
  text-align: left;
  font-family: var(--serif);
  font-size: 1rem;
  color: var(--ink);
  cursor: pointer;
  box-shadow: 0 1px 0 rgba(80, 60, 30, .05);
  transition: border-color .15s ease, transform .15s ease, background-color .15s ease;
}

.scene:hover { border-color: #b9a988; transform: translateY(-2px); }
.scene:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.scene-text { line-height: 1.55; min-height: 3.1em; }

.slot {
  min-height: 34px;
  display: grid;
  place-items: center;
  border: 1px dashed var(--rule);
  border-radius: 2px;
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--ink-faint);
}

.scene.filled .slot {
  border-style: solid;
  border-color: transparent;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 13px;
  letter-spacing: .1em;
}

.scene.ok { border-color: var(--ok); background: #f3f4ec; }
.scene.ok .slot { background: #dfe6d6; color: var(--ok); }

.scene.bad {
  border-color: var(--bad);
  animation: shake .38s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-5px); }
  40% { transform: translateX(5px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(3px); }
}

/* ---------- 标签 ---------- */

.tray-wrap {
  margin-top: 26px;
  padding-top: 18px;
  border-top: 1px dashed var(--rule);
}

.tray-label {
  margin: 0 0 12px;
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--ink-faint);
}

.tray { display: flex; flex-wrap: wrap; gap: 10px; }

.chip {
  font-family: var(--sans);
  font-size: 14px;
  letter-spacing: .1em;
  padding: 9px 20px;
  border-radius: 999px;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  transition: background-color .15s ease, color .15s ease, opacity .15s ease;
}

.chip:hover { background: var(--paper-deep); }

.chip[aria-pressed="true"] {
  background: var(--ink);
  color: var(--paper);
}

.chip[disabled] {
  opacity: .28;
  text-decoration: line-through;
  cursor: default;
}

.feedback {
  min-height: 1.6em;
  margin: 20px 0 0;
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.6;
  color: var(--bad);
}

/* ---------- 揭示 ---------- */

.slip {
  margin: 10px 0 34px;
  padding: 32px 30px;
  background: var(--card);
  border: 1px dashed #c9b99c;
  border-radius: 2px;
  transform: rotate(-.4deg);
  box-shadow: 0 2px 0 rgba(80, 60, 30, .06);
}

.reveal-text {
  margin: 0;
  font-size: clamp(1.2rem, 3.4vw, 1.55rem);
  line-height: 1.6;
  letter-spacing: .02em;
}

.reveal-note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-soft);
}

/* ---------- 笔记本 ---------- */

.rules {
  margin: 0 0 40px;
  padding: 0;
  list-style: none;
  counter-reset: rule;
}

.rules li {
  counter-increment: rule;
  position: relative;
  padding: 16px 0 16px 46px;
  border-bottom: 1px solid var(--rule);
  font-size: 1.05rem;
  line-height: 1.6;
}

.rules li::before {
  content: counter(rule, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 20px;
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ink-faint);
}

.card-summary {
  position: relative;
  padding: 26px 26px 24px;
  border: 2px solid var(--ink);
  border-radius: 2px;
  margin-bottom: 34px;
}

.card-summary::after {
  content: "已结业";
  position: absolute;
  right: 18px;
  bottom: 14px;
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--accent);
  border: 1px solid currentColor;
  padding: 3px 8px;
  transform: rotate(-6deg);
  opacity: .75;
}

.summary-text {
  margin: 0 0 8px;
  font-size: 1.15rem;
  line-height: 1.6;
}

.summary-sub {
  margin: 0;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-soft);
}

/* ---------- 选项（第五关） ---------- */

.options { display: grid; gap: 10px; margin: 0 0 8px; }

.option {
  display: block;
  width: 100%;
  text-align: left;
  padding: 16px 18px;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 3px;
  font-family: var(--serif);
  font-size: 1rem;
  color: var(--ink);
  cursor: pointer;
  transition: border-color .15s ease, transform .15s ease;
}

.option:hover { border-color: #b9a988; transform: translateX(2px); }
.option.bad { border-color: var(--bad); animation: shake .38s ease; }
.option.ok { border-color: var(--ok); background: #f3f4ec; }
.option[disabled] { cursor: default; opacity: .55; }
.option[disabled]:hover { transform: none; border-color: var(--rule); }

.afterword {
  margin: 18px 0 0;
  padding: 18px 20px;
  border-left: 2px solid var(--accent);
  background: rgba(255, 253, 246, .7);
  font-size: .95rem;
  line-height: 1.75;
  color: var(--ink-soft);
  white-space: pre-line;
}

/* ---------- 页脚 ---------- */

.foot {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 clamp(20px, 6vw, 40px) 40px;
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--ink-faint);
}

.foot p { margin: 0; padding-top: 18px; border-top: 1px solid var(--rule); }

/* ---------- 窄屏 ---------- */

@media (max-width: 720px) {
  .scenes { grid-template-columns: 1fr; }
  .scene-text { min-height: 0; }
  .scene { grid-template-columns: 1fr auto; align-items: center; }
  .slot { min-height: 30px; padding: 0 12px; }
  .sentence { font-size: clamp(1.6rem, 7vw, 2.2rem); }
  .slip { padding: 26px 22px; transform: none; }
}