/* ==========================================================================
   DSSF-Net · 项目展示
   浅色页面框架 + 深色 3D 展台。字体、间距、层级统一在这里定义。
   ========================================================================== */

@font-face {
  font-family: "Noto Sans SC";
  src: url("./assets/fonts/NotoSansSC-VF.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Noto Serif SC";
  src: url("./assets/fonts/NotoSerifSC-VF.woff2") format("woff2");
  font-weight: 200 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("./assets/fonts/JetBrainsMono-VF.woff2") format("woff2");
  font-weight: 100 800;
  font-style: normal;
  font-display: swap;
}

:root {
  color-scheme: light;
  --bg: #e9edf1;
  --bg-soft: #f4f6f8;
  --panel: #ffffff;
  --panel-soft: rgba(255, 255, 255, 0.82);
  --line: rgba(12, 28, 40, 0.09);
  --line-strong: rgba(12, 28, 40, 0.16);
  --text: #111a22;
  --text-2: #4c5a68;
  --text-3: #7e8c9a;
  --accent: #0fa392;
  --accent-bright: #35e0c8;
  --accent-ink: #0a7268;
  --accent-solid: #0a8074;
  --blue: #4c9aff;
  --blue-ink: #2f66c9;
  --warm: #ffb36b;
  --male: #d9663d;
  --female: #2f8fd8;
  --warn: #b7791f;
  --danger: #d1435b;

  --stage: #081017;
  --stage-2: #0e1a23;
  --stage-line: rgba(220, 238, 248, 0.09);
  --stage-text: #e7f0f6;
  --stage-muted: rgba(207, 224, 235, 0.62);

  --radius: 14px;
  --radius-lg: 22px;
  --shadow-panel: 0 18px 46px -22px rgba(12, 28, 40, 0.30);
  --shadow-stage: 0 40px 90px -36px rgba(5, 14, 22, 0.70);
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --dur: 0.42s;

  --sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", system-ui, sans-serif;
  --font: var(--sans);
  --serif: "Noto Serif SC", "Songti SC", "Source Han Serif SC", "SimSun", serif;
  --mono: "JetBrains Mono", "Cascadia Mono", Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

[hidden] { display: none !important; }

button { font-family: inherit; }

button:focus-visible,
a:focus-visible {
  outline: 2px solid rgba(15, 163, 146, 0.65);
  outline-offset: 2px;
}

::selection { background: rgba(15, 163, 146, 0.22); }

/* ---------- top bar ---------- */

.topbar {
  position: fixed;
  z-index: 40;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 0 28px;
  background: linear-gradient(180deg, rgba(247, 249, 251, 0.96), rgba(244, 247, 249, 0.82));
  border-bottom: 1px solid var(--line);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.7) inset;
  backdrop-filter: blur(20px) saturate(1.05);
}

.brand { display: flex; align-items: center; gap: 13px; min-width: 0; }

.brand-mark {
  width: 30px;
  height: 30px;
  flex: none;
  border-radius: 10px;
  background:
    radial-gradient(circle at 30% 24%, #d6fff8, var(--accent) 46%, #07564f 100%);
  box-shadow: 0 6px 16px -6px rgba(15, 163, 146, 0.55), 0 0 0 1px rgba(15, 163, 146, 0.18);
  position: relative;
}
.brand-mark::after {
  content: "";
  position: absolute;
  inset: 8px 9px;
  border-radius: 50%;
  border: 1.5px solid rgba(255, 255, 255, 0.94);
}

.brand-text h1 {
  margin: 0;
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: 0.015em;
  white-space: nowrap;
}
.brand-text p {
  margin: 3px 0 0;
  font-family: var(--mono);
  font-size: 8.5px;
  font-weight: 500;
  color: var(--text-3);
  letter-spacing: 0.16em;
  white-space: nowrap;
}

.steps {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  border-radius: 999px;
  background: rgba(12, 28, 40, 0.045);
}
.step {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 34px;
  padding: 0 15px;
  border-radius: 999px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-3);
  font-size: 12.5px;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.step span {
  font-family: var(--mono);
  font-size: 9.5px;
  font-weight: 600;
  color: var(--text-3);
  transition: color var(--dur) var(--ease);
}
.step:hover:not([disabled]) { color: var(--text); }
.step.is-active {
  background: #ffffff;
  border-color: rgba(12, 28, 40, 0.06);
  color: var(--text);
  box-shadow: 0 2px 8px -2px rgba(12, 28, 40, 0.16), 0 8px 20px -16px rgba(12, 28, 40, 0.5);
}
.step.is-active span { color: var(--accent-ink); }
.step[disabled] { opacity: 0.4; cursor: not-allowed; }

.actions { display: flex; align-items: center; gap: 8px; margin-left: auto; transition: opacity 0.35s var(--ease); }
body.is-cover .actions { opacity: 0; pointer-events: none; }

.action-group {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border-radius: 10px;
  background: rgba(12, 28, 40, 0.045);
}
.action-group.is-icons { padding: 2px; }

.btn {
  height: 32px;
  padding: 0 12px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-2);
  font-size: 12.5px;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
  white-space: nowrap;
}
.btn:hover { background: rgba(255, 255, 255, 0.9); color: var(--text); box-shadow: 0 3px 10px -6px rgba(12, 28, 40, 0.4); }
.btn:active { transform: scale(0.98); }
.btn[aria-pressed="true"] {
  color: var(--accent-ink);
  background: rgba(15, 163, 146, 0.10);
  box-shadow: inset 0 0 0 1px rgba(15, 163, 146, 0.20);
}
.btn.btn-primary {
  height: 36px;
  padding: 0 16px;
  background: var(--accent-solid);
  color: #ffffff;
  font-weight: 600;
  box-shadow: 0 10px 22px -10px rgba(10, 128, 116, 0.62);
}
.btn.btn-primary:hover { background: #0b8d80; color: #ffffff; box-shadow: 0 12px 26px -10px rgba(10, 128, 116, 0.7); }
.btn.btn-primary[aria-pressed="true"] { background: #0a6f65; color: #ffffff; }
.btn.icon { width: 32px; padding: 0; font-size: 15px; line-height: 1; font-family: var(--mono); }
.btn.only-mobile { display: none; }
.story-glyph { font-size: 9px; margin-right: 2px; }

/* ---------- stage ---------- */

.stage {
  position: fixed;
  z-index: 5;
  top: 88px;
  left: 24px;
  right: 388px;
  bottom: 24px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--stage);
  box-shadow: var(--shadow-stage), inset 0 0 0 1px rgba(255, 255, 255, 0.07);
  transition: right 0.55s var(--ease), border-radius 0.55s var(--ease);
}
body.is-cover .stage,
body[data-story="1"] .stage { right: 24px; }

#scene {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  outline: none;
}

.stage-vignette {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(120% 95% at 52% 42%, transparent 48%, rgba(2, 8, 12, 0.42) 100%),
    linear-gradient(180deg, rgba(4, 10, 15, 0.34) 0%, transparent 20%, transparent 76%, rgba(3, 8, 12, 0.52) 100%);
  z-index: 1;
}
.stage-glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(52% 46% at 60% 44%, rgba(58, 116, 132, 0.16), transparent 70%),
    radial-gradient(40% 40% at 22% 18%, rgba(255, 179, 107, 0.045), transparent 72%);
}

.stage-topline {
  position: absolute;
  z-index: 12;
  top: 24px;
  left: 28px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--stage-muted);
  font-size: 11px;
  letter-spacing: 0.06em;
  pointer-events: none;
  transition: opacity 0.4s var(--ease);
}
body.is-cover .stage-topline { opacity: 0; }
.stage-index {
  font-family: var(--mono);
  font-size: 10px;
  color: #0a171d;
  background: var(--accent-bright);
  border-radius: 5px;
  padding: 3px 6px;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.stage-title { color: rgba(232, 243, 249, 0.9); font-weight: 600; }
.stage-sep { width: 18px; height: 1px; background: var(--stage-line); }
.stage-sub { font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.12em; text-transform: uppercase; color: rgba(190, 211, 224, 0.48); }

.stage-caption {
  position: absolute;
  z-index: 12;
  left: 30px;
  bottom: 106px;
  display: flex;
  align-items: center;
  gap: 9px;
  color: rgba(206, 224, 235, 0.6);
  font-size: 11px;
  letter-spacing: 0.02em;
  pointer-events: none;
}
.caption-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent-bright);
  box-shadow: 0 0 0 4px rgba(53, 224, 200, 0.10);
}

/* ---------- 全流程展签（提示牌） ---------- */

.flow-placard {
  position: absolute;
  z-index: 13;
  left: 30px;
  top: 96px;
  width: 312px;
  padding: 18px 18px 16px;
  border-radius: 15px;
  border: 1px solid rgba(214, 238, 248, 0.14);
  background:
    linear-gradient(165deg, rgba(10, 22, 29, 0.92), rgba(6, 14, 20, 0.84));
  color: var(--stage-text);
  box-shadow:
    0 28px 56px -28px rgba(0, 0, 0, 0.85),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(16px) saturate(1.05);
  cursor: pointer;
  transition: opacity 0.45s var(--ease), transform 0.45s var(--ease), border-color 0.25s var(--ease);
}
.flow-placard:hover { border-color: rgba(53, 224, 200, 0.28); }
.flow-placard::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(53, 224, 200, 0.85), rgba(53, 224, 200, 0.05));
}
body.is-cover .flow-placard,
body[data-story="1"] .flow-placard {
  opacity: 0;
  transform: translateX(-12px);
  pointer-events: none;
}
.placard-pin {
  position: absolute;
  right: 13px;
  top: 13px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #d8e4ec, #6f7f8b 55%, #2a343d 100%);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.6);
}
.placard-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding-right: 12px; }
.placard-kicker {
  font-family: var(--mono);
  font-size: 8.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: rgba(190, 212, 224, 0.58);
  text-transform: uppercase;
}
.placard-tag {
  flex: none;
  display: inline-flex;
  align-items: center;
  height: 19px;
  padding: 0 7px;
  border-radius: 5px;
  border: 1px solid rgba(53, 224, 200, 0.28);
  background: rgba(53, 224, 200, 0.08);
  color: var(--accent-bright);
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: 0.04em;
}
.flow-placard h3 {
  margin: 10px 0 12px;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: 0.01em;
  color: #f1f8fb;
}
.placard-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(214, 238, 248, 0.08);
}
.placard-steps li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7.5px 0;
  border-bottom: 1px solid rgba(214, 238, 248, 0.06);
}
.placard-steps b {
  flex: none;
  width: 20px;
  font-family: var(--mono);
  font-size: 8.5px;
  font-weight: 600;
  color: var(--accent-bright);
  letter-spacing: 0.02em;
}
.placard-steps span {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  width: 100%;
  min-width: 0;
}
.placard-steps strong { font-size: 12px; font-weight: 600; color: rgba(236, 246, 251, 0.92); white-space: nowrap; }
.placard-steps em {
  font-style: normal;
  font-family: var(--mono);
  font-size: 9px;
  color: rgba(188, 210, 223, 0.52);
  text-align: right;
  line-height: 1.4;
  white-space: nowrap;
}
.placard-play {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  width: 100%;
  height: 35px;
  margin-top: 12px;
  border: 0;
  border-radius: 9px;
  background: var(--accent-bright);
  color: #04251f;
  font-size: 11.5px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 10px 24px -12px rgba(53, 224, 200, 0.65);
  transition: background 0.2s var(--ease), transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.placard-play:hover { background: #5cebd7; box-shadow: 0 14px 28px -12px rgba(53, 224, 200, 0.72); transform: translateY(-1px); }
.placard-play:active { transform: scale(0.99); }
.placard-play span { font-size: 8px; }
.placard-play kbd {
  margin-left: 2px;
  padding: 1px 5px;
  border-radius: 4px;
  background: rgba(4, 37, 31, 0.18);
  color: rgba(4, 37, 31, 0.72);
  font-family: var(--mono);
  font-size: 8.5px;
  line-height: 1.4;
}
.placard-note {
  margin: 8px 0 0;
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: 0.03em;
  color: rgba(182, 205, 218, 0.42);
  text-align: center;
}

@media (max-width: 1360px) and (min-width: 1201px) {
  .flow-placard { left: 20px; width: 280px; padding: 16px; }
  .flow-placard h3 { font-size: 20px; }
  .placard-steps em { font-size: 8.5px; }
}

@media (max-width: 1200px) {
  .flow-placard { display: none; }
}

/* ---------- cover ---------- */

.stage-scrim {
  position: absolute;
  inset: 0;
  z-index: 11;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(4, 10, 14, 0.86) 0%, rgba(4, 10, 14, 0.64) 26%, rgba(4, 10, 14, 0.18) 48%, transparent 62%);
  opacity: 1;
  transition: opacity 0.55s var(--ease);
}
body:not(.is-cover) .stage-scrim { opacity: 0; }

.cover {
  position: absolute;
  z-index: 14;
  left: 58px;
  top: 50%;
  width: min(600px, 46vw);
  transform: translateY(-52%);
  color: var(--stage-text);
  transition: opacity 0.5s var(--ease), transform 0.6s var(--ease);
}
body:not(.is-cover) .cover {
  opacity: 0;
  transform: translateY(-52%) translateX(-18px);
  pointer-events: none;
}
.cover-kicker {
  margin: 0 0 20px;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(200, 220, 232, 0.55);
}
.cover-year {
  color: var(--accent-bright);
  margin-right: 6px;
}
.cover-title {
  margin: 0 0 22px;
  font-family: var(--serif);
  font-size: clamp(38px, 3.55vw, 54px);
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: 0.015em;
  color: #f2f8fb;
  text-shadow: 0 2px 30px rgba(0, 0, 0, 0.25);
}
.cover-title span { display: block; white-space: nowrap; }
.cover-lead {
  margin: 0 0 30px;
  max-width: 430px;
  font-size: 14px;
  line-height: 1.9;
  color: rgba(226, 239, 247, 0.82);
}
.cover-stats {
  display: flex;
  gap: 0;
  margin: 0 0 32px;
  padding: 0;
}
.cover-stats > div {
  padding: 0 24px;
  border-left: 1px solid rgba(220, 239, 248, 0.13);
}
.cover-stats > div:first-child { padding-left: 0; border-left: 0; }
.cover-stats dt {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  color: rgba(199, 219, 231, 0.62);
  text-transform: uppercase;
  white-space: nowrap;
}
.cover-stats dd {
  margin: 8px 0 5px;
  font-family: var(--mono);
  font-size: 30px;
  line-height: 1;
  font-weight: 500;
  letter-spacing: -0.03em;
  color: #f5fbfe;
  font-variant-numeric: tabular-nums;
}
.cover-stats dd small {
  font-size: 13px;
  font-weight: 400;
  margin-left: 2px;
  color: var(--accent-bright);
}
.cover-stats span {
  display: block;
  font-size: 9.5px;
  color: rgba(190, 212, 224, 0.54);
  white-space: nowrap;
}
.cover-actions { display: flex; align-items: center; gap: 14px; }
.cover-enter {
  height: 46px;
  padding: 0 24px;
  border: 0;
  border-radius: 12px;
  background: var(--accent-bright);
  color: #052921;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.01em;
  cursor: pointer;
  box-shadow: 0 16px 34px -16px rgba(53, 224, 200, 0.66);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
}
.cover-enter span { margin-left: 8px; font-family: var(--mono); }
.cover-enter:hover { background: #5cebd7; box-shadow: 0 20px 40px -16px rgba(53, 224, 200, 0.75); transform: translateY(-1px); }
.cover-story {
  height: 46px;
  padding: 0 18px;
  border: 1px solid rgba(220, 239, 248, 0.18);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.045);
  color: rgba(232, 244, 250, 0.88);
  font-size: 12.5px;
  font-weight: 500;
  cursor: pointer;
  backdrop-filter: blur(8px);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.cover-story span { font-size: 9px; margin-right: 6px; color: var(--accent-bright); }
.cover-story:hover { background: rgba(255, 255, 255, 0.09); border-color: rgba(220, 239, 248, 0.28); }
.cover-foot {
  margin: 22px 0 0;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.08em;
  color: rgba(180, 204, 219, 0.36);
}

/* ---------- inspector ---------- */

.inspector {
  position: fixed;
  z-index: 20;
  top: 88px;
  right: 24px;
  bottom: 24px;
  width: 340px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 20px;
  overflow-y: auto;
  overscroll-behavior: contain;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(250, 252, 253, 0.92));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-panel);
  backdrop-filter: blur(20px) saturate(1.05);
  scrollbar-width: thin;
  scrollbar-color: rgba(12, 28, 40, 0.18) transparent;
  transition: transform 0.55s var(--ease), opacity 0.4s var(--ease);
}
.inspector::-webkit-scrollbar { width: 5px; }
.inspector::-webkit-scrollbar-thumb { background: rgba(12, 28, 40, 0.16); border-radius: 99px; }
.inspector > * { flex: 0 0 auto; }
body.is-cover .inspector,
body[data-story="1"] .inspector {
  opacity: 0;
  transform: translateX(26px);
  pointer-events: none;
}

.inspector-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 8px; }
.eyebrow {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-ink);
}
.inspector-head h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: 25px;
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1.2;
}
.inspector-sub {
  margin: 7px 0 0;
  max-width: 250px;
  font-size: 11px;
  line-height: 1.65;
  color: var(--text-3);
}
.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  margin-top: 6px;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(15, 163, 146, 0.11), 0 0 12px rgba(15, 163, 146, 0.45);
}

.chip-row { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  display: inline-flex;
  align-items: center;
  height: 25px;
  padding: 0 9px;
  border-radius: 7px;
  background: rgba(12, 28, 40, 0.035);
  border: 1px solid var(--line);
  color: var(--text-2);
  font-size: 10.5px;
  font-family: var(--mono);
  white-space: nowrap;
}

.card {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #ffffff;
  padding: 15px;
  box-shadow: 0 1px 2px rgba(12, 28, 40, 0.03);
}
.card-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 8px; margin-bottom: 10px; }
.card-head h3 { margin: 0; font-size: 13px; font-weight: 700; color: var(--text); letter-spacing: 0.01em; }
.card-sub { margin: 4px 0 0; font-size: 10px; color: var(--text-3); letter-spacing: 0.01em; }

.tag {
  display: inline-flex;
  align-items: center;
  height: 21px;
  padding: 0 8px;
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.04em;
  color: var(--text-2);
  background: rgba(12, 28, 40, 0.045);
  border: 1px solid var(--line);
  white-space: nowrap;
}
.tag-warn { color: var(--warn); border-color: rgba(183, 121, 31, 0.28); background: rgba(183, 121, 31, 0.08); }

.layer-row { display: flex; gap: 5px; margin-bottom: 8px; }
.layer {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 26px;
  padding: 0 9px;
  border-radius: 7px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text-3);
  font-family: var(--mono);
  font-size: 10.5px;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.layer i { width: 13px; height: 2px; border-radius: 2px; display: inline-block; transition: box-shadow var(--dur) var(--ease); }
.layer[data-layer="d2"] i { background: #0f9e8f !important; }
.layer[data-layer="d5"] i { background: #3d7bfd !important; }
.layer[data-layer="delta"] i { background: #c98a1f !important; }
.layer.is-on { color: var(--text); border-color: var(--line-strong); background: #fbfcfd; }
.layer.is-on[data-layer="d2"] i { box-shadow: 0 0 8px rgba(15, 158, 143, 0.45); }
.layer.is-on[data-layer="d5"] i { box-shadow: 0 0 8px rgba(61, 123, 253, 0.40); }
.layer.is-on[data-layer="delta"] i { box-shadow: 0 0 8px rgba(201, 138, 31, 0.40); }

#chart { display: block; width: 100%; height: 182px; }

.note {
  margin: 8px 0 0;
  color: var(--text-3);
  font-size: 10.5px;
  line-height: 1.6;
}

.part-card { min-height: 168px; }

.part-head { display: flex; gap: 11px; align-items: flex-start; margin-bottom: 10px; }
.part-index {
  flex: none;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--accent-ink);
  background: rgba(15, 163, 146, 0.08);
  border: 1px solid rgba(15, 163, 146, 0.18);
}
.part-head h3 { margin: 0; font-size: 14.5px; font-weight: 700; }
.part-head p { margin: 3px 0 0; font-family: var(--mono); font-size: 9px; color: var(--text-3); letter-spacing: 0.03em; }

.specs { margin: 0; display: grid; gap: 1px; }
.specs > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0;
  border-top: 1px solid rgba(12, 28, 40, 0.06);
}
.specs dt { color: var(--text-3); font-size: 11.5px; white-space: nowrap; }
.specs dd { margin: 0; font-size: 11.5px; color: var(--text); text-align: right; font-family: var(--mono); line-height: 1.55; }

.path { list-style: none; margin: 3px 0 0; padding: 0; display: grid; gap: 1px; counter-reset: path; }
.path li {
  position: relative;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0 8px 24px;
  border-top: 1px solid rgba(12, 28, 40, 0.06);
  counter-increment: path;
}
.path li::before {
  content: counter(path);
  position: absolute;
  left: 0;
  top: 9px;
  width: 15px;
  height: 15px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 8.5px;
  font-weight: 600;
  color: var(--accent-ink);
  background: #ffffff;
  border: 1px solid rgba(15, 163, 146, 0.28);
}
.path b { font-size: 12px; font-weight: 600; }
.path span { font-size: 10px; color: var(--text-3); text-align: right; line-height: 1.45; }

.hint { margin: 0 2px; color: var(--text-3); font-size: 10.5px; line-height: 1.6; }

.rail-foot {
  margin: auto 2px 0;
  padding-top: 12px;
  border-top: 1px solid rgba(12, 28, 40, 0.06);
  font-family: var(--mono);
  font-size: 9px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--text-3);
}
.perf {
  margin-top: 8px;
  padding-top: 10px;
  border-top: 1px solid rgba(12, 28, 40, 0.06);
  color: #6b7483;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.02em;
  user-select: none;
}

/* ---------- hotspots ---------- */

.hotspot-layer { position: absolute; inset: 0; z-index: 10; pointer-events: none; overflow: hidden; }

.hotspot {
  position: absolute;
  width: 0;
  height: 0;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
  pointer-events: auto;
  outline: none;
}
.hotspot .dot {
  position: absolute;
  left: -3.5px;
  top: -3.5px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-bright);
  border: 1.5px solid rgba(6, 22, 28, 0.72);
  box-shadow: 0 0 0 3px rgba(53, 224, 200, 0.14), 0 2px 8px rgba(0, 0, 0, 0.45);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.hotspot .ring {
  position: absolute;
  left: -10px;
  top: -10px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1px solid rgba(53, 224, 200, 0.28);
  animation: pulse 2.6s ease-in-out infinite;
}
.hotspot .label {
  position: absolute;
  left: 15px;
  top: -13px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 9px 4px 7px;
  border-radius: 7px;
  background: rgba(7, 16, 23, 0.76);
  border: 1px solid rgba(214, 238, 248, 0.13);
  color: rgba(231, 243, 250, 0.9);
  font-size: 10.5px;
  line-height: 1.35;
  white-space: nowrap;
  box-shadow: 0 8px 22px -12px rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(10px);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
  pointer-events: none;
}
.hotspot .label::before {
  content: "";
  position: absolute;
  left: -10px;
  top: 50%;
  width: 10px;
  height: 1px;
  background: rgba(214, 238, 248, 0.28);
}
.hotspot .label b {
  font-family: var(--mono);
  font-size: 8.5px;
  font-weight: 600;
  color: var(--accent-bright);
  letter-spacing: 0.02em;
}
.hotspot.flip .label { left: auto; right: 15px; }
.hotspot.flip .label::before { left: auto; right: -10px; }
.hotspot:hover .label,
.hotspot.is-active .label {
  background: rgba(12, 30, 39, 0.94);
  border-color: rgba(53, 224, 200, 0.34);
  color: #ffffff;
}
.hotspot:hover .dot, .hotspot.is-active .dot {
  transform: scale(1.5);
  box-shadow: 0 0 0 5px rgba(53, 224, 200, 0.18), 0 2px 10px rgba(0, 0, 0, 0.5);
}
.hotspot:hover .ring, .hotspot.is-active .ring {
  border-color: rgba(53, 224, 200, 0.55);
  box-shadow: 0 0 0 5px rgba(53, 224, 200, 0.08), 0 0 20px rgba(53, 224, 200, 0.22);
}
.hotspot.is-active .ring { animation-play-state: paused; opacity: 1; }
.hotspot:focus-visible .dot { box-shadow: 0 0 0 4px rgba(53, 224, 200, 0.35); }

@keyframes pulse {
  0% { transform: scale(0.6); opacity: 0.9; }
  70% { transform: scale(1.55); opacity: 0; }
  100% { transform: scale(1.55); opacity: 0; }
}

/* 部件标签错位排布，避免在装置密集处叠字 */
.hotspot[data-part="incubator"] .label { left: auto; right: 15px; top: -38px; }
.hotspot[data-part="incubator"] .label::before { display: none; }
.hotspot[data-part="lamp"] .label { left: 17px; top: 13px; }
.hotspot[data-part="lamp"] .label::before { display: none; }
.hotspot[data-part="platform"] .label { left: 19px; top: 18px; }
.hotspot[data-part="platform"] .label::before { display: none; }
.hotspot[data-part="egg"] .label { left: 19px; top: -39px; }
.hotspot[data-part="egg"] .label::before { display: none; }
.hotspot[data-part="lens"] .label { left: auto; right: 16px; top: -30px; }
.hotspot[data-part="lens"] .label::before { display: none; }
.hotspot[data-part="spectrometer"] .label { left: 18px; top: -32px; }
.hotspot[data-part="spectrometer"] .label::before { display: none; }
.hotspot[data-part="computer"] .label { left: 18px; top: -16px; }
.hotspot[data-part="computer"] .label::before { display: none; }
.hotspot[data-part="ccd"] { display: none; }
.hotspot[data-part="refs"] { display: none; }

body.is-cover .hotspot-layer { display: none; }
body[data-story="1"] .hotspot-layer { display: none; }

@media (max-width: 980px) {
  .hotspot .label { display: none; }
  .hotspot .label::before { display: none; }
}

/* ---------- annotation ---------- */

.annotation {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 34;
  width: 272px;
  padding: 14px 15px;
  border-radius: 14px;
  border: 1px solid rgba(12, 28, 40, 0.18);
  background: rgba(255, 255, 255, 0.97);
  color: var(--text);
  box-shadow: 0 26px 60px -24px rgba(0, 0, 0, 0.55), 0 2px 8px rgba(0, 0, 0, 0.08);
  backdrop-filter: blur(20px) saturate(1.08);
  opacity: 0;
  transform: translate(-50%, calc(-100% - 18px)) scale(0.96);
  transform-origin: 50% 100%;
  transition: opacity 160ms ease-out, transform 200ms ease-out;
  pointer-events: none;
  will-change: opacity, transform;
}
.annotation.is-in {
  opacity: 1;
  transform: translate(-50%, calc(-100% - 18px)) scale(1);
  pointer-events: auto;
}
.annotation::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -18px;
  width: 1px;
  height: 18px;
  background: linear-gradient(180deg, rgba(53, 224, 200, 0.72), rgba(53, 224, 200, 0));
  transform: translateX(-0.5px);
  pointer-events: none;
}
.annotation-stem {
  position: absolute;
  left: 50%;
  bottom: -18px;
  width: 1px;
  height: 18px;
  background: linear-gradient(180deg, rgba(53, 224, 200, 0.72), rgba(53, 224, 200, 0));
  transform: translateX(-0.5px);
}
.annotation.is-below { transform: translate(-50%, 18px) scale(0.96); transform-origin: 50% 0; }
.annotation.is-below.is-in { transform: translate(-50%, 18px) scale(1); }
.annotation.is-below::after,
.annotation.is-below .annotation-stem {
  bottom: auto;
  top: -18px;
  background: linear-gradient(0deg, rgba(53, 224, 200, 0.72), rgba(53, 224, 200, 0));
}
.annotation-head { display: flex; align-items: center; gap: 10px; }
.annotation-head > div { min-width: 0; }
.annotation-index {
  flex: none;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--accent-ink);
  background: rgba(15, 163, 146, 0.08);
  border: 1px solid rgba(15, 163, 146, 0.2);
}
.annotation-head b { display: block; font-size: 13.5px; font-weight: 700; letter-spacing: 0.01em; line-height: 1.3; }
.annotation-sub {
  display: block;
  margin-top: 2px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.02em;
  color: var(--text-3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.annotation-specs {
  margin: 11px 0 0;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 7px 10px;
}
.annotation-specs > div { min-width: 0; }
.annotation-specs dt { font-size: 9.5px; color: var(--text-2); margin-bottom: 2px; }
.annotation-specs dd { margin: 0; font-family: var(--mono); font-size: 11.5px; color: var(--text); line-height: 1.4; }
.annotation-link {
  margin-top: 11px;
  width: 100%;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: 7px;
  border: 1px solid var(--line-strong);
  background: rgba(12, 28, 40, 0.03);
  color: var(--text-2);
  font-family: inherit;
  font-size: 11px;
  cursor: pointer;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.annotation-link::after { content: "→"; font-family: var(--mono); font-size: 11px; opacity: 0.66; }
.annotation-link:hover { background: rgba(15, 163, 146, 0.08); border-color: rgba(15, 163, 146, 0.34); color: var(--accent-ink); }

/* ---------- transport ---------- */

.transport {
  position: absolute;
  z-index: 16;
  left: 28px;
  right: 28px;
  bottom: 22px;
  height: 66px;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 18px 0 12px;
  border-radius: 15px;
  border: 1px solid rgba(214, 238, 248, 0.11);
  background: rgba(8, 18, 26, 0.72);
  color: var(--stage-text);
  box-shadow: 0 20px 44px -22px rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(18px) saturate(1.05);
}

.play {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  height: 42px;
  padding: 0 18px 0 14px;
  border: 0;
  border-radius: 11px;
  background: var(--accent-bright);
  color: #04251f;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 10px 24px -10px rgba(53, 224, 200, 0.55);
  transition: filter var(--dur) var(--ease), transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
  white-space: nowrap;
}
.play:hover { filter: brightness(1.06); box-shadow: 0 14px 28px -10px rgba(53, 224, 200, 0.62); }
.play:active { transform: scale(0.98); }
.play:disabled { filter: grayscale(0.4) brightness(0.8); cursor: progress; box-shadow: none; }
.play-icon { font-size: 11px; transform: translateY(0.5px); }

.timeline { flex: 1; min-width: 0; display: grid; gap: 9px; }
.track { height: 3px; border-radius: 99px; background: rgba(210, 235, 246, 0.14); overflow: hidden; }
.fill {
  height: 100%;
  width: 0%;
  border-radius: 99px;
  background: linear-gradient(90deg, rgba(53, 224, 200, 0.55), var(--accent-bright));
  box-shadow: 0 0 12px rgba(53, 224, 200, 0.55);
  transition: width 0.08s linear;
}
.transport-meta { display: flex; justify-content: space-between; gap: 16px; font-size: 10.5px; color: rgba(190, 212, 225, 0.46); }
.transport-meta #status { color: rgba(220, 236, 245, 0.72); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.transport-right { font-family: var(--mono); font-size: 9.5px; white-space: nowrap; }

/* ---------- result ---------- */

.result {
  position: fixed;
  z-index: 30;
  left: 44px;
  top: 108px;
  width: min(620px, calc(100vw - 460px));
  padding: 20px;
  border-radius: 18px;
  border: 1px solid rgba(15, 163, 146, 0.20);
  background: linear-gradient(150deg, rgba(255, 255, 255, 0.99), rgba(246, 249, 250, 0.99));
  box-shadow: 0 30px 70px -28px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(255, 255, 255, 0.7) inset;
  opacity: 0;
  transform: translateY(-14px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.result.is-in { opacity: 1; transform: translateY(0); }

.result-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.result-title h3 { margin: 0; font-family: var(--serif); font-size: 20px; font-weight: 600; }
.result-title .eyebrow { margin-bottom: 4px; font-size: 9px; }
.result-tools { display: flex; align-items: center; gap: 6px; }
.icon-btn {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 7px;
  border: 1px solid var(--line-strong);
  background: #ffffff;
  color: var(--text-2);
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.icon-btn:hover { background: rgba(12, 28, 40, 0.05); color: var(--text); border-color: rgba(12, 28, 40, 0.22); }

.result-body { display: grid; grid-template-columns: 178px 1fr 148px; gap: 18px; align-items: center; margin: 16px 0 12px; }

.verdict { display: flex; align-items: center; gap: 9px; }
.ring { width: 68px; height: 68px; flex: none; transform: rotate(-90deg); }
.ring-track { fill: none; stroke: rgba(12, 28, 40, 0.10); stroke-width: 8; }
.ring-value { fill: none; stroke-width: 8; stroke-linecap: round; transition: stroke-dashoffset 0.9s cubic-bezier(0.16, 1, 0.3, 1); }
.verdict-text { display: grid; gap: 2px; min-width: 0; }
.verdict-text .eyebrow { margin: 0; font-size: 8.5px; letter-spacing: 0.02em; white-space: nowrap; }
.verdict-text strong { font-family: var(--serif); font-size: 25px; font-weight: 600; line-height: 1.1; }
.verdict-text .confidence { font-size: 10px; color: var(--text-3); font-family: var(--mono); }

.result-metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 9px 14px; }
.metrics-label { margin: 0 0 5px; font-size: 9px; line-height: 1.3; color: var(--text-3); }
.result-metrics > div { min-width: 0; }
.result-metrics dt { font-size: 10px; color: var(--text-3); margin-bottom: 1px; }
.result-metrics dd { margin: 0; font-family: var(--mono); font-size: 16px; color: var(--text); }
.result-metrics span { font-size: 9.5px; color: var(--text-3); white-space: nowrap; }

.cm { display: grid; grid-template-columns: 22px 1fr 1fr; gap: 3px; font-family: var(--mono); font-size: 9.5px; color: var(--text-3); }
.cm > span { display: grid; place-items: center; height: 23px; }
.cm .ok { color: var(--accent-ink); background: rgba(15, 163, 146, 0.09); border-radius: 4px; }
.cm .bad { color: var(--male); background: rgba(226, 102, 60, 0.10); border-radius: 4px; }
.cm .head { color: var(--text-3); }

.result-foot {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}
.result-foot p { margin: 0; font-size: 10px; line-height: 1.55; color: var(--text-3); }
.btn.small { height: 30px; padding: 0 12px; font-size: 11px; white-space: nowrap; }

.tag-demo { color: var(--warn); border-color: rgba(183, 121, 31, 0.28); background: rgba(183, 121, 31, 0.08); }
.tag-paper { color: var(--blue-ink); border-color: rgba(42, 95, 208, 0.24); background: rgba(61, 123, 253, 0.08); }
.tag-model { color: var(--accent-ink); border-color: rgba(15, 163, 146, 0.26); background: rgba(15, 163, 146, 0.08); }

.result-wide {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0 0 12px;
  padding: 9px 11px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: rgba(12, 28, 40, 0.03);
  color: var(--text-2);
  font-size: 11px;
}
.result-wide strong { margin-left: auto; font-family: var(--mono); font-size: 16px; color: var(--text); }
.result-wide em { font-style: normal; font-size: 9px; color: var(--text-3); font-family: var(--mono); }

.result-notes { flex: 1; min-width: 0; display: grid; gap: 4px; }
.legal-details { margin-top: 3px; }
.legal-details summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  list-style: none;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.03em;
  color: var(--text-3);
  user-select: none;
}
.legal-details summary::-webkit-details-marker { display: none; }
.legal-details summary::before { content: "+"; color: var(--accent-ink); font-size: 11px; }
.legal-details[open] summary::before { content: "−"; }
.legal-details summary:hover { color: var(--text-2); }
.legal-details[open] { margin-top: 4px; }
.legal-details p { margin: 6px 0 0; }
.result-notes p { margin: 0; }
.source-note { font-size: 10px; line-height: 1.55; color: var(--text-2); }
.legal { font-size: 9.5px; line-height: 1.55; color: var(--text-3); }

.paper-body { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 9px; margin: 14px 0 12px; }
.paper-metric {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: #ffffff;
  box-shadow: 0 1px 2px rgba(12, 28, 40, 0.04);
  min-width: 0;
}
.paper-metric span { display: block; font-size: 9.5px; color: var(--text-3); }
.paper-metric strong { display: block; margin-top: 5px; font-family: var(--mono); font-size: 22px; font-weight: 500; color: var(--text); }
.paper-metric em { display: block; margin-top: 3px; font-style: normal; font-size: 9px; color: var(--text-3); line-height: 1.45; }
.paper-note { margin: 0 0 12px; font-size: 10.5px; line-height: 1.6; color: var(--text-2); }

.xray-badge {
  position: absolute;
  z-index: 18;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid rgba(255, 179, 107, 0.30);
  background: rgba(8, 18, 26, 0.78);
  color: rgba(226, 239, 247, 0.78);
  font-size: 10.5px;
  white-space: nowrap;
  pointer-events: none;
  backdrop-filter: blur(12px);
  box-shadow: 0 10px 26px -14px rgba(0, 0, 0, 0.7);
}
.xray-badge b { color: var(--warm); font-weight: 600; }

/* ---------- overlays ---------- */

.loading {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  background: var(--bg);
  transition: opacity 0.45s ease, visibility 0.45s ease;
}
.loading.is-hidden { opacity: 0; visibility: hidden; }
.loading-inner { display: grid; justify-items: center; gap: 16px; }
.loading-inner p { margin: 0; font-family: var(--mono); font-size: 10px; color: var(--text-3); letter-spacing: 0.16em; text-transform: uppercase; }
.loader-mark {
  width: 48px;
  height: 48px;
  border-radius: 15px;
  border: 1px solid rgba(15, 163, 146, 0.30);
  background: radial-gradient(circle at 35% 30%, rgba(15, 163, 146, 0.34), rgba(15, 163, 146, 0.04) 68%);
  box-shadow: 0 14px 36px -14px rgba(15, 163, 146, 0.45);
  animation: breathe 1.8s ease-in-out infinite;
}
.loader-track { width: 172px; height: 2px; background: rgba(12, 28, 40, 0.08); border-radius: 2px; overflow: hidden; }
.loader-track span { display: block; height: 100%; width: 40%; border-radius: 2px; background: var(--accent); animation: load 1.2s ease-in-out infinite; }

@keyframes breathe { 50% { transform: scale(0.94); opacity: 0.7; } }
@keyframes load { 0% { transform: translateX(-100%); } 100% { transform: translateX(260%); } }

.toast {
  position: fixed;
  z-index: 110;
  left: 50%;
  bottom: 30px;
  transform: translate(-50%, 10px);
  padding: 10px 15px;
  border-radius: 10px;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.98);
  color: var(--text);
  font-size: 12px;
  box-shadow: 0 16px 36px -16px rgba(12, 28, 40, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
  max-width: min(560px, calc(100vw - 32px));
  text-align: center;
}
.toast.is-on { opacity: 1; transform: translate(-50%, 0); }

.fallback {
  position: fixed;
  z-index: 90;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 10px;
  padding: 32px;
  text-align: center;
  background: var(--bg);
}
.fallback h2 { margin: 0; font-family: var(--serif); font-size: 24px; font-weight: 600; }
.fallback p { margin: 0 auto; max-width: 560px; color: var(--text-2); font-size: 13px; line-height: 1.75; }
.fallback .note { color: var(--text-3); font-size: 11px; }

.noscript { position: fixed; inset: 0; display: grid; place-items: center; margin: 0; background: var(--bg); color: var(--text-2); }

/* 资产/对比图用：?clean=1 只留 3D 视口 */
body.clean .topbar,
body.clean .inspector,
body.clean .transport,
body.clean .hotspot-layer,
body.clean .stage-vignette,
body.clean .stage-glow,
body.clean .stage-topline,
body.clean .stage-caption,
body.clean .cover,
body.clean .xray-badge,
body.clean .result,
body.clean .toast {
  display: none !important;
}
body.clean .stage {
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: 0;
  box-shadow: none;
}

/* ---------- responsive ---------- */

@media (max-width: 1360px) {
  .brand-text p { display: none; }
  .stage { right: 364px; }
  .inspector { width: 316px; }
  .cover { width: min(560px, 50vw); }
  .result { width: min(560px, calc(100vw - 420px)); }
  .result-body { grid-template-columns: 130px 1fr; }
  .cm { display: none; }
}

@media (max-width: 1120px) {
  .topbar { gap: 16px; padding: 0 18px; }
  .steps { position: static; transform: none; margin-left: auto; }
  .actions { margin-left: 0; }
  .step { padding: 0 10px; }
  .stage { right: 24px; }
  .inspector {
    top: auto;
    left: 24px;
    right: 24px;
    bottom: 24px;
    width: auto;
    max-height: 60vh;
    transform: translateY(calc(100% + 40px));
    z-index: 38;
  }
  .inspector.is-open { transform: translateY(0); }
  .btn.only-mobile { display: inline-grid; place-items: center; }
  .cover { width: min(500px, 60vw); }
  body.is-cover .inspector { transform: translateY(calc(100% + 40px)); opacity: 1; }
}

@media (max-width: 900px) {
  .topbar { height: 62px; padding: 0 14px; gap: 10px; }
  body[data-step="1"]:not(.is-cover) .steps {
    display: flex;
    flex-wrap: nowrap;
    position: fixed;
    z-index: 30;
    top: 72px;
    left: 50%;
    transform: translateX(-50%);
    width: max-content;
    max-width: calc(100vw - 24px);
    margin: 0;
    padding: 3px;
    background: rgba(8, 18, 26, 0.72);
    border: 1px solid rgba(214, 238, 248, 0.12);
    backdrop-filter: blur(12px);
  }
  body[data-step="1"]:not(.is-cover) .step {
    height: 28px;
    padding: 0 10px;
    font-size: 11px;
    white-space: nowrap;
    color: rgba(218, 234, 243, 0.66);
  }
  body[data-step="1"]:not(.is-cover) .step span { display: none; }
  body[data-step="1"]:not(.is-cover) .step.is-active {
    background: rgba(255, 255, 255, 0.14);
    border-color: transparent;
    color: #ffffff;
    box-shadow: none;
  }
  body.has-result .steps, body.has-result[data-step="1"]:not(.is-cover) .steps { display: none !important; }
  body.is-cover .steps { display: none; }
  .stage-topline { display: none; }
  .stage-scrim {
    background: linear-gradient(180deg, rgba(4, 10, 14, 0.78) 0%, rgba(4, 10, 14, 0.60) 42%, rgba(4, 10, 14, 0.84) 100%);
  }
  .brand-text h1 { font-size: 13.5px; }
  .brand-mark { width: 26px; height: 26px; border-radius: 8px; }
  .steps { display: none; }
  body:not([data-step="1"]) .steps { display: flex; gap: 2px; }
  body:not([data-step="1"]) .step { padding: 0 8px; }
  body:not([data-step="1"]) .step span { display: none; }
  .btn.flow-label, .flow-label { display: none; }
  .btn.btn-primary { width: 36px; padding: 0; justify-content: center; }
  .btn.btn-primary .story-glyph { margin: 0; font-size: 10px; }
  .stage { top: 74px; left: 12px; right: 12px; bottom: 12px; border-radius: 18px; }
  body.is-cover .stage, body[data-story="1"] .stage { right: 12px; }
  .cover { left: 28px; right: 28px; width: auto; top: 50%; }
  .cover-title { font-size: clamp(30px, 5.1vw, 42px); }
  .cover-title span { white-space: normal; }
  .cover-lead { font-size: 13px; }
  .cover-stats dd { font-size: 24px; }
  .cover-stats > div { padding: 0 16px; }
  .stage-topline { left: 20px; top: 18px; }
  .stage-sub, .stage-sep { display: none; }
  .transport { left: 14px; right: 14px; bottom: 14px; height: 58px; padding: 0 12px; gap: 12px; }
  .play { height: 38px; padding: 0 14px; }
  #play-label { display: none; }
  .transport-right { display: none; }
  .transport-meta { font-size: 9.5px; }
  .stage-caption { display: none; }
  .result { left: 20px; right: 20px; top: 84px; width: auto; max-height: 70vh; overflow-y: auto; }
  .result-body { grid-template-columns: 1fr; gap: 12px; align-items: start; }
  .result-foot { flex-direction: column; align-items: flex-start; }
  .paper-body { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .topbar { gap: 6px; padding: 0 10px; }
  .brand { gap: 7px; }
  .brand-text h1 { max-width: 134px; font-size: 12px; overflow: hidden; text-overflow: ellipsis; }
  .steps { flex-wrap: nowrap; }
  .step { white-space: nowrap; padding: 0 7px; font-size: 10.5px; }
  .actions { gap: 4px; }
  .action-group { display: none; }
  .btn.only-mobile { display: inline-grid; }
  .cover { left: 20px; right: 20px; }
  .cover-kicker { font-size: 8.5px; margin-bottom: 14px; }
  .cover-title { font-size: 30px; margin-bottom: 16px; }
  .cover-lead { font-size: 12px; line-height: 1.8; margin-bottom: 20px; }
  .cover-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    margin-bottom: 24px;
  }
  .cover-stats > div { padding: 0 10px; min-width: 0; }
  .cover-stats > div:first-child { padding-left: 0; }
  .cover-stats dt { font-size: 7.5px; letter-spacing: 0.05em; white-space: normal; line-height: 1.35; }
  .cover-stats dd { font-size: 20px; margin: 6px 0 3px; }
  .cover-stats span { font-size: 7.5px; white-space: normal; line-height: 1.35; }
  .cover-actions { flex-direction: column; align-items: stretch; gap: 9px; }
  .cover-enter, .cover-story { height: 42px; }
  .cover-foot { display: none; }
  .stage-topline { display: none; }
  .xray-badge { top: 12px; font-size: 9.5px; max-width: calc(100vw - 40px); white-space: normal; text-align: center; }
  .result { left: 12px; right: 12px; top: 76px; padding: 15px; }
  .result-body { gap: 10px; }
  .result-metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 16px; }
}

@media (max-height: 860px) and (min-width: 1121px) {
  .inspector { padding: 16px; gap: 10px; }
  .inspector-head h2 { font-size: 22px; }
  .inspector-sub { margin-top: 5px; font-size: 10.5px; }
  .card { padding: 12px; }
  #chart { height: 142px; }
  .part-card { min-height: 140px; }
  .specs > div { padding: 6px 0; }
  .path li { padding: 6px 0 6px 24px; }
  .hint { display: none; }
  .rail-foot { padding-top: 10px; }
}

@media (max-width: 370px) {
  .brand-text { display: none; }
  .step { padding: 0 5px; font-size: 10px; }
  .cover-title { font-size: 26px; }
  .cover-stats dd { font-size: 18px; }
}

@media (max-height: 520px) and (orientation: landscape) {
  .cover {
    left: 30px;
    width: min(540px, 64vw);
    transform: translateY(-50%);
  }
  .cover-kicker { margin-bottom: 8px; font-size: 8.5px; }
  .cover-title { font-size: 30px; margin-bottom: 12px; }
  .cover-title span { white-space: nowrap; }
  .cover-lead { display: none; }
  .cover-stats { margin-bottom: 16px; }
  .cover-stats dd { font-size: 22px; }
  .cover-stats span { display: none; }
  .cover-enter, .cover-story { height: 40px; }
  .cover-foot { display: none; }
  .stage-scrim {
    background: linear-gradient(90deg, rgba(4, 10, 14, 0.90) 0%, rgba(4, 10, 14, 0.48) 54%, transparent 74%);
  }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .hotspot .ring { display: none; }
}