/* ==========================================================================
   应县木塔 · 三维档案
   墨木 · 夯土：深墨底 + 原木暖橙 + 鎏金
   ========================================================================== */

:root {
  --ink: #0b0908;
  --ink-2: #100d0b;
  --panel: #171310;
  --panel-2: #1e1914;
  --line: #2a231d;
  --line-2: #3a3129;
  --text: #efe5d6;
  --text-2: #a99c8c;
  --text-3: #6b6058;
  --clay: #c86a3c;
  --clay-2: #e08753;
  --gold: #cba55c;

  --font-display: "Songti SC", "STSong", "Source Han Serif SC", "Noto Serif CJK SC", "SimSun", serif;
  --font-body: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;

  --topbar: 64px;
  --pad: clamp(20px, 2.6vw, 44px);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: rgba(200, 106, 60, .32); }

a { color: inherit; text-decoration: none; }
h1, h2, h3 { margin: 0; font-weight: 700; font-family: var(--font-display); line-height: 1.25; text-wrap: balance; }
p { margin: 0; }
ul, ol, dl { margin: 0; padding: 0; list-style: none; }

:focus-visible {
  outline: 2px solid var(--clay);
  outline-offset: 3px;
}

/* ---------------------------------------------------------------- 顶栏 */
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 44px);
  height: var(--topbar);
  padding: 0 var(--pad);
  background: rgba(11, 9, 8, .82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  flex: none;
}
.brand__mark {
  width: 30px;
  height: 30px;
  color: var(--gold);
  flex: none;
}
.brand__text { display: flex; flex-direction: column; line-height: 1.25; }
.brand__text b { font-family: var(--font-display); font-size: 17px; letter-spacing: .06em; }
.brand__text i {
  font-style: normal;
  font-size: 9px;
  letter-spacing: .16em;
  color: var(--text-3);
}

.topnav {
  display: flex;
  gap: clamp(14px, 2vw, 30px);
  margin-left: auto;
  font-size: 13px;
  color: var(--text-2);
}
.topnav a {
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: color .2s, border-color .2s;
}
.topnav a:hover { color: var(--text); }
.topnav a.is-on { color: var(--clay-2); border-color: rgba(200, 106, 60, .6); }

.topbar__status {
  display: flex;
  align-items: center;
  gap: 7px;
  flex: none;
  font-size: 10px;
  letter-spacing: .12em;
  color: var(--text-3);
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
}
.dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #7bc47f;
  box-shadow: 0 0 0 3px rgba(123, 196, 127, .14);
}
.dot--live { background: var(--clay); box-shadow: 0 0 0 3px rgba(200, 106, 60, .18); }

/* ---------------------------------------------------------------- 布局 */
.layout {
  display: grid;
  grid-template-columns: minmax(352px, .96fr) minmax(0, 1.04fr);
  align-items: start;
}

/* ---------------------------------------------------------------- 三维视口 */
.stage {
  position: sticky;
  top: var(--topbar);
  grid-column: 2;
  grid-row: 1;
  height: calc(100vh - var(--topbar));
  background: #0b0908;
  overflow: hidden;
  isolation: isolate;
}
#scene { display: block; width: 100%; height: 100%; touch-action: none; }

.stage__badge,
.stage__tools,
.stage__presets,
.stage__explode,
.stage__hint { position: absolute; z-index: 3; }

.stage__badge {
  top: 16px;
  left: 16px;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 6px 12px;
  font-size: 10px;
  letter-spacing: .1em;
  color: var(--text-2);
  background: rgba(23, 19, 16, .82);
  border: 1px solid var(--line-2);
  border-radius: 999px;
  backdrop-filter: blur(8px);
}

.stage__tools {
  top: 16px;
  right: 16px;
  display: flex;
  gap: 8px;
}
.tool {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  padding: 0;
  color: var(--text-2);
  background: rgba(30, 25, 20, .86);
  border: 1px solid var(--line-2);
  border-radius: 10px;
  cursor: pointer;
  transition: color .2s, border-color .2s, background .2s;
}
.tool svg { width: 16px; height: 16px; }
.tool:hover { color: var(--text); border-color: #4a3d30; }
.tool.is-on { color: var(--clay-2); border-color: rgba(200, 106, 60, .55); background: rgba(60, 32, 18, .8); }

.stage__presets {
  left: 16px;
  bottom: 74px;
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.chip {
  padding: 6px 12px;
  font-family: inherit;
  font-size: 11px;
  color: var(--text-2);
  background: rgba(23, 19, 16, .84);
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
  transition: .2s;
  backdrop-filter: blur(8px);
}
.chip:hover { color: var(--text); border-color: #4a3d30; }
.chip.is-on {
  color: #1a120c;
  background: var(--clay);
  border-color: transparent;
}

.stage__explode {
  right: 16px;
  bottom: 74px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  font-size: 10px;
  letter-spacing: .06em;
  color: var(--text-2);
  background: rgba(23, 19, 16, .84);
  border: 1px solid var(--line);
  border-radius: 999px;
  backdrop-filter: blur(8px);
}
.stage__explode input[type="range"] {
  width: 108px;
  height: 3px;
  appearance: none;
  -webkit-appearance: none;
  background: linear-gradient(to right, var(--clay) 0%, var(--clay) var(--fill, 0%), #3a3129 var(--fill, 0%), #3a3129 100%);
  border-radius: 3px;
  cursor: pointer;
}
.stage__explode input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--clay);
  border: 1px solid #f0c6a6;
}
.stage__explode input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border: 1px solid #f0c6a6;
  border-radius: 50%;
  background: var(--clay);
}
.stage__explode output { color: var(--gold); min-width: 20px; text-align: right; }

.stage__hint {
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%);
  font-size: 10px;
  letter-spacing: .08em;
  color: #4f4640;
  white-space: nowrap;
}
.stage__fade {
  position: absolute;
  inset: auto 0 0 0;
  height: 90px;
  z-index: 2;
  pointer-events: none;
  background: linear-gradient(to top, rgba(11, 9, 8, .92), rgba(11, 9, 8, 0));
}

/* 标注 */
.hotspots { position: absolute; inset: 0; z-index: 4; pointer-events: none; }
.hotspot {
  position: absolute;
  top: 0;
  left: 0;
  margin: -6px 0 0 -6px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0;
  border: 0;
  background: none;
  font-family: inherit;
  color: inherit;
  opacity: 0;
  pointer-events: none;
  transition: opacity .35s;
  will-change: transform;
}
.hotspot.is-in { opacity: 1; pointer-events: auto; }
.hotspot__dot {
  position: relative;
  width: 12px;
  height: 12px;
  flex: none;
  border-radius: 50%;
  border: 1px solid var(--clay);
  background: rgba(200, 106, 60, .28);
}
.hotspot__dot::after {
  content: "";
  position: absolute;
  inset: 3px;
  border-radius: 50%;
  background: var(--clay-2);
}
.hotspot__box {
  display: flex;
  flex-direction: column;
  gap: 1px;
  padding: 6px 10px;
  text-align: left;
  background: rgba(36, 30, 25, .94);
  border: 1px solid rgba(200, 106, 60, .22);
  border-radius: 6px;
  backdrop-filter: blur(6px);
  transition: border-color .2s, transform .2s;
}
.hotspot:hover .hotspot__box { border-color: rgba(200, 106, 60, .6); transform: translateX(2px); }
.hotspot__box b { font-size: 11px; font-weight: 600; letter-spacing: .02em; }
.hotspot__box i { font-style: normal; font-size: 9px; color: var(--text-3); }

/* ---------------------------------------------------------------- 文档流 */
.doc {
  grid-column: 1;
  grid-row: 1;
  padding: 0 var(--pad) 110px;
  max-width: 760px;
  width: 100%;
  justify-self: end;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 11px;
  font-size: 11px;
  letter-spacing: .16em;
  color: #c08a5e;
}
.eyebrow__line { width: 26px; height: 1px; background: var(--clay); }

/* Hero */
.hero { padding: clamp(48px, 7vh, 96px) 0 8px; }
.hero h1 {
  margin: 22px 0 0;
  font-size: clamp(38px, 4.6vw, 62px);
  line-height: 1.16;
  letter-spacing: .015em;
}
.hero h1 em {
  font-style: normal;
  color: var(--gold);
}
.lead {
  margin-top: 22px;
  max-width: 34em;
  font-size: 14.5px;
  line-height: 2;
  color: var(--text-2);
}
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}
.stats b {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(22px, 2.2vw, 30px);
  font-weight: 600;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}
.stats b small { font-size: .5em; margin-left: 2px; color: var(--text-2); }
.stats span { font-size: 10px; letter-spacing: .05em; color: var(--text-3); }

/* 区块 */
.block { padding-top: clamp(64px, 9vh, 112px); }
.block__head { max-width: 26em; }
.block__head h2 {
  margin: 14px 0 0;
  font-size: clamp(23px, 2.05vw, 30px);
  line-height: 1.45;
  letter-spacing: .01em;
}
.block__lead {
  margin-top: 16px;
  font-size: 13.5px;
  line-height: 1.95;
  color: var(--text-2);
}

/* 时间轴 */
.timeline {
  margin-top: 34px;
  border-top: 1px solid var(--line);
}
.timeline li {
  display: grid;
  grid-template-columns: 78px 1fr;
  gap: 6px 20px;
  padding: 18px 0;
  border-bottom: 1px solid rgba(42, 35, 29, .68);
}
.timeline b {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}
.timeline h3 { font-size: 14px; font-weight: 600; font-family: var(--font-body); }
.timeline p { grid-column: 2; font-size: 12.5px; line-height: 1.85; color: var(--text-3); }

/* 卡片 */
.cards {
  display: grid;
  gap: 12px;
  margin-top: 30px;
}
.card {
  padding: 22px 24px;
  background: linear-gradient(180deg, rgba(30, 25, 20, .78), rgba(23, 19, 16, .6));
  border: 1px solid var(--line);
  border-radius: 10px;
  transition: border-color .25s, transform .25s;
}
.card:hover { border-color: rgba(200, 106, 60, .35); transform: translateY(-2px); }
.card__tag {
  font-size: 9.5px;
  letter-spacing: .18em;
  color: #c08a5e;
}
.card h3 { margin: 8px 0 8px; font-size: 18px; }
.card p { font-size: 12.5px; line-height: 1.9; color: var(--text-2); }

/* 楼层列表 */
.layerlist {
  margin-top: 28px;
  display: grid;
  gap: 3px;
}
.layer {
  display: grid;
  grid-template-columns: 34px 1fr auto;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 13px 14px;
  font-family: inherit;
  text-align: left;
  color: inherit;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  transition: background .2s, border-color .2s;
}
.layer:hover { background: rgba(30, 25, 20, .62); }
.layer.is-on {
  background: rgba(200, 106, 60, .1);
  border-color: rgba(200, 106, 60, .34);
}
.layer__i {
  font-size: 10px;
  letter-spacing: .1em;
  color: var(--text-3);
  font-variant-numeric: tabular-nums;
}
.layer.is-on .layer__i { color: var(--clay-2); }
.layer__t { display: flex; flex-direction: column; gap: 1px; min-width: 0; }
.layer__t b { font-size: 13.5px; font-weight: 600; }
.layer__t i {
  font-style: normal;
  font-size: 11px;
  color: var(--text-3);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.layer.is-on .layer__t i { color: var(--text-2); }
.layer__tag {
  font-size: 9px;
  letter-spacing: .1em;
  color: var(--text-3);
  padding: 3px 7px;
  border: 1px solid var(--line);
  border-radius: 999px;
}
.layer.is-on .layer__tag { color: var(--gold); border-color: rgba(203, 165, 92, .4); }

/* 斗拱 */
.dougong {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 28px;
  margin-top: 30px;
  align-items: start;
}
.dougong__art {
  padding: 18px;
  background: rgba(23, 19, 16, .7);
  border: 1px solid var(--line);
  border-radius: 10px;
}
.dougong__art svg { display: block; width: 100%; height: auto; color: #d9c29b; }
.dougong__cap {
  margin-top: 10px;
  font-size: 9.5px;
  letter-spacing: .1em;
  color: var(--text-3);
  text-align: center;
}
.parts { display: grid; gap: 0; }
.parts li {
  display: grid;
  grid-template-columns: 62px 1fr auto;
  gap: 14px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid rgba(42, 35, 29, .7);
}
.parts li:first-child { border-top: 1px solid rgba(42, 35, 29, .7); }
.parts b { font-family: var(--font-display); font-size: 15px; font-weight: 600; }
.parts i { font-style: normal; font-size: 11.5px; line-height: 1.85; color: var(--text-2); }
.parts em { font-style: normal; font-size: 10px; color: #c08a5e; white-space: nowrap; }

/* 保护现状 */
.status {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 30px;
  margin-top: 30px;
  padding: 26px;
  background: rgba(23, 19, 16, .8);
  border: 1px solid rgba(203, 165, 92, .2);
  border-radius: 12px;
}
.status h3 { font-size: 20px; }
.status__main p { margin-top: 10px; font-size: 12px; line-height: 1.9; color: var(--text-2); }
.status__metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; align-content: center; }
.status__metrics dt { font-size: 9.5px; letter-spacing: .1em; color: var(--text-3); }
.status__metrics dd {
  margin: 5px 0 0;
  font-family: var(--font-display);
  font-size: 19px;
  color: var(--gold);
}
.measures {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 14px;
}
.measures li {
  padding: 20px;
  background: rgba(23, 19, 16, .55);
  border: 1px solid var(--line);
  border-radius: 10px;
}
.measures span { font-size: 10px; letter-spacing: .12em; color: #c08a5e; }
.measures h3 { margin: 8px 0 6px; font-size: 14px; font-family: var(--font-body); font-weight: 600; }
.measures p { font-size: 11.5px; line-height: 1.85; color: var(--text-3); }

/* 参观 */
.info { margin-top: 26px; border-top: 1px solid var(--line); }
.info > div {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 18px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(42, 35, 29, .68);
}
.info dt { font-size: 10px; letter-spacing: .12em; color: var(--text-3); padding-top: 3px; }
.info dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: 15px;
  color: var(--text);
}
.info dd small {
  display: block;
  margin-top: 5px;
  font-family: var(--font-body);
  font-size: 11px;
  color: var(--text-3);
  line-height: 1.7;
}
.notice {
  margin-top: 20px;
  padding: 14px 16px;
  font-size: 11.5px;
  line-height: 1.85;
  color: var(--text-2);
  background: rgba(200, 106, 60, .07);
  border-left: 2px solid rgba(200, 106, 60, .5);
  border-radius: 0 6px 6px 0;
}

/* 页脚 */
.foot {
  margin-top: clamp(64px, 9vh, 110px);
  padding-top: 30px;
  border-top: 1px solid var(--line);
}
.foot__line {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.4vw, 30px);
  color: var(--text);
}
.foot__meta {
  margin-top: 14px;
  font-size: 10.5px;
  line-height: 1.9;
  color: #4f4640;
}

/* 进场 */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .8s ease, transform .8s ease; }
.reveal.is-seen { opacity: 1; transform: none; }

/* ---------------------------------------------------------------- 响应式 */
@media (max-width: 1180px) {
  .layout { grid-template-columns: minmax(320px, .92fr) minmax(0, 1.08fr); }
  .dougong { grid-template-columns: 200px 1fr; gap: 20px; }
}

@media (max-width: 900px) {
  :root { --topbar: 56px; }

  .layout { display: block; }

  .stage {
    position: sticky;
    top: var(--topbar);
    z-index: 20;
    height: 52vh;
    border-bottom: 1px solid var(--line);
  }

  /* 竖滑交给页面滚动，横向拖拽才旋转模型，避免小屏无法翻页 */
  #scene { touch-action: pan-y; }

  .doc {
    max-width: none;
    padding: 8px var(--pad) 80px;
    justify-self: stretch;
  }

  .topnav { display: none; }
  .topbar__status { display: none; }

  .hero { padding-top: 26px; }
  .hero h1 { font-size: clamp(30px, 8.6vw, 42px); }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 16px 12px; }

  .stage__badge { top: 12px; left: 12px; font-size: 9px; padding: 5px 10px; }
  .stage__tools { top: 12px; right: 12px; }
  .tool { width: 30px; height: 30px; border-radius: 8px; }
  .stage__presets { left: 12px; bottom: 62px; gap: 5px; }
  .chip { padding: 5px 10px; font-size: 10px; }
  .stage__explode { right: 12px; bottom: 62px; padding: 7px 11px; gap: 8px; font-size: 9px; }
  .stage__explode input[type="range"] { width: 74px; }
  .stage__hint { display: none; }

  .hotspot__box { padding: 4px 8px; }
  .hotspot__box b { font-size: 10px; }
  .hotspot__box i { display: none; }

  .cards { gap: 10px; }
  .card { padding: 18px; }

  .layer { grid-template-columns: 28px 1fr auto; gap: 10px; padding: 12px 10px; }
  .layer__t b { font-size: 13px; }

  .dougong { grid-template-columns: 1fr; gap: 18px; }
  .dougong__art { max-width: 230px; margin: 0 auto; }

  .status { grid-template-columns: 1fr; gap: 20px; padding: 20px; }
  .measures { grid-template-columns: 1fr; }

  .timeline li { grid-template-columns: 62px 1fr; gap: 4px 14px; }
  .timeline b { font-size: 16px; }

  .info > div { grid-template-columns: 52px 1fr; gap: 14px; }
}

@media (max-width: 620px) {
  .partinfo { left: 12px; right: 12px; width: auto; }
}

@media (max-width: 420px) {
  .layer__tag { display: none; }
  .layer { grid-template-columns: 26px 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}

/* ---------------------------------------------------------------- 模式切换 */
.stage__modes {
  position: absolute;
  z-index: 3;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 2px;
  padding: 3px;
  background: rgba(23, 19, 16, .86);
  border: 1px solid var(--line-2);
  border-radius: 999px;
  backdrop-filter: blur(8px);
}
.mode {
  padding: 5px 15px;
  font-family: inherit;
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--text-2);
  background: none;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  transition: color .2s, background .2s;
}
.mode:hover { color: var(--text); }
.mode.is-on { color: #1a120c; background: var(--clay); }

/* 层内模式下的控件替换 */
.stage__roamhint,
.stage__roamnav { display: none; }
.stage[data-mode="room"] .stage__roamnav,
.stage[data-mode="an"] .stage__roamnav {
  display: flex;
  gap: 6px;
  position: absolute;
  z-index: 3;
  left: 16px;
  bottom: 74px;
}
.stage[data-mode="room"] .stage__roamhint,
.stage[data-mode="an"] .stage__roamhint {
  display: block;
  position: absolute;
  z-index: 3;
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%);
  font-size: 10px;
  letter-spacing: .06em;
  color: #5b5148;
  white-space: nowrap;
}
.stage[data-mode="room"] .stage__presets,
.stage[data-mode="an"] .stage__presets,
.stage[data-mode="room"] .stage__explode,
.stage[data-mode="an"] .stage__explode,
.stage[data-mode="room"] .stage__hint,
.stage[data-mode="an"] .stage__hint { display: none; }

/* 构件信息面板 */
.partinfo {
  position: absolute;
  z-index: 5;
  left: 16px;
  bottom: 62px;
  width: 264px;
  padding: 14px 16px 15px;
  background: rgba(28, 23, 19, .94);
  border: 1px solid rgba(200, 106, 60, .32);
  border-radius: 10px;
  backdrop-filter: blur(10px);
  animation: partIn .28s ease both;
}
@keyframes partIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.partinfo__tag {
  font-size: 9px;
  letter-spacing: .18em;
  color: #c08a5e;
}
.partinfo h3 {
  margin: 5px 0 7px;
  font-size: 16px;
  font-family: var(--font-display);
  color: var(--text);
}
.partinfo p:last-of-type {
  font-size: 11.5px;
  line-height: 1.85;
  color: var(--text-2);
}
.partinfo__close {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  padding: 0;
  font-size: 15px;
  line-height: 1;
  color: var(--text-3);
  background: none;
  border: 0;
  border-radius: 6px;
  cursor: pointer;
}
.partinfo__close:hover { color: var(--text); background: rgba(255, 255, 255, .06); }

@media (max-width: 900px) {
  .stage__modes { top: 10px; }
  .mode { padding: 4px 12px; font-size: 10px; }
  .partinfo { bottom: 56px; padding: 12px 14px 13px; }
  .partinfo h3 { font-size: 14px; }
  .stage[data-mode="room"] .stage__roamhint,
.stage[data-mode="an"] .stage__roamhint { display: none; }
}