/* ==========================================================================
   應縣木塔 · 界面（宋式素雅：木色、墨色、微金）
   ========================================================================== */
:root {
  --ink: #f0e8da;
  --dim: #bdae97;
  --gold: #d8a24a;
  --panel: rgba(26, 22, 19, 0.82);
  --line: rgba(216, 162, 74, 0.3);
  --serif: 'Songti SC', 'SimSun', 'Georgia', serif;
  --sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}
* {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: #0d0c0b;
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}
#scene {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}
body.hide-ui #hud,
body.hide-ui #views,
body.hide-ui #panel,
body.hide-ui #hint {
  opacity: 0;
  pointer-events: none;
}
#hud,
#views,
#panel,
#hint {
  transition: opacity 0.3s;
}

/* -------------------------------- 标题 --------------------------------- */
#hud {
  position: fixed;
  top: 16px;
  left: 20px;
  z-index: 5;
  pointer-events: none;
}
#hud h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: 32px;
  letter-spacing: 0.3em;
  text-shadow: 0 2px 16px #000, 0 0 3px #000;
}
#hud h1::after {
  content: '';
  display: block;
  height: 2px;
  margin-top: 5px;
  background: linear-gradient(90deg, var(--gold), transparent);
}
#hud .sub {
  margin: 6px 0 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--dim);
  text-shadow: 0 1px 10px #000;
}
#stats {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  margin-top: 9px;
  max-width: 430px;
  font-size: 11.5px;
  color: var(--dim);
  text-shadow: 0 1px 8px #000;
}
#stats b {
  color: var(--gold);
  font-weight: 600;
}

/* ------------------------------- 视角条 -------------------------------- */
#views {
  position: fixed;
  top: 132px;
  left: 20px;
  z-index: 6;
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 176px;
}
#views button {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-left: 3px solid transparent;
  border-radius: 6px;
  background: var(--panel);
  backdrop-filter: blur(8px);
  color: var(--ink);
  font: inherit;
  font-size: 13px;
  text-align: left;
  cursor: pointer;
  transition: 0.16s;
}
#views button:hover {
  background: rgba(60, 48, 38, 0.9);
  transform: translateX(4px);
}
#views button.active {
  border-left-color: var(--gold);
  background: rgba(84, 62, 36, 0.92);
}
#views button i {
  font-style: normal;
  width: 16px;
  color: var(--dim);
  font-size: 11px;
}
#views .vsep {
  height: 1px;
  margin: 4px 2px;
  background: var(--line);
}

/* -------------------------------- 面板 --------------------------------- */
#panel {
  position: fixed
  ;
  top: 16px;
  right: 20px;
  z-index: 6;
  width: 314px;
  max-height: calc(100vh - 32px);
  overflow-y: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  backdrop-filter: blur(10px);
  font-size: 12.5px;
}
#panel::-webkit-scrollbar {
  width: 6px;
}
#panel::-webkit-scrollbar-thumb {
  background: rgba(216, 162, 74, 0.35);
  border-radius: 3px;
}
.pnl-head {
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  font-family: var(--serif);
  font-size: 15px;
  letter-spacing: 0.16em;
  color: var(--gold);
}
#controls {
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 9px;
  border-bottom: 1px solid var(--line);
}
.row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.row label.t {
  color: var(--dim);
  min-width: 62px;
  letter-spacing: 0.04em;
}
.row input[type='range'] {
  flex: 1;
  accent-color: var(--gold);
  height: 3px;
}
.row .v {
  min-width: 54px;
  text-align: right;
  font-family: var(--serif);
  color: var(--gold);
}
.chks {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
}
.chk {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--dim);
  cursor: pointer;
}
.chk input {
  accent-color: var(--gold);
}

/* ------------------------------- 说明卡 -------------------------------- */
#doc {
  padding: 12px 14px 16px;
}
#doc h3 {
  margin: 0 0 2px;
  font-family: var(--serif);
  font-size: 17px;
  letter-spacing: 0.08em;
  color: var(--ink);
}
#doc .sub2 {
  margin: 0 0 8px;
  font-size: 11.5px;
  color: var(--gold);
  letter-spacing: 0.06em;
}
#doc p {
  margin: 0 0 9px;
  line-height: 1.78;
  color: var(--ink);
  font-size: 12.5px;
}
#doc ul {
  margin: 0 0 10px;
  padding-left: 17px;
  color: var(--dim);
  line-height: 1.8;
  font-size: 12px;
}
#doc li::marker {
  color: var(--gold);
}
#doc .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-bottom: 10px;
}
#doc .tag {
  padding: 2px 7px;
  border: 1px solid var(--line);
  border-radius: 3px;
  font-size: 11px;
  color: var(--dim);
}
#doc .jbtns {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}
#doc .jbtns button {
  padding: 4px 8px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--ink);
  font: inherit;
  font-size: 11.5px;
  cursor: pointer;
}
#doc .jbtns button:hover,
#doc .jbtns button.on {
  border-color: var(--gold);
  background: rgba(216, 162, 74, 0.2);
}
.note {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-size: 11px;
  line-height: 1.7;
  color: var(--dim);
}

/* -------------------------------- 提示 --------------------------------- */
#hint {
  position: fixed;
  left: 20px;
  bottom: 16px;
  z-index: 5;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  max-width: 300px;
  font-size: 11px;
  color: var(--dim);
  text-shadow: 0 1px 8px #000;
}
kbd {
  padding: 1px 5px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.07);
  font-family: var(--sans);
  font-size: 10px;
}

/* ------------------------------- 加载页 -------------------------------- */
#loading {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at 50% 42%, #241d17, #0b0a09 72%);
  transition: opacity 0.7s;
}
#loading.done {
  opacity: 0;
  pointer-events: none;
}
.l-inner {
  text-align: center;
  width: min(400px, 84vw);
}
.l-mark {
  font-size: 44px;
  color: var(--gold);
}
.l-inner h2 {
  margin: 8px 0 14px;
  font-family: var(--serif);
  font-size: 28px;
  letter-spacing: 0.4em;
}
.l-inner p {
  margin: 0 0 14px;
  min-height: 32px;
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--dim);
}
.l-inner code {
  color: #ff9c8a;
}
.l-track {
  height: 3px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.1);
  overflow: hidden;
}
#loading-bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, #8a6220, var(--gold));
  transition: width 0.3s;
}

@media (max-width: 1080px) {
  #panel {
    width: 268px;
  }
  #views {
    width: 150px;
  }
}
@media (max-width: 820px) {
  #views,
  #hint {
    display: none;
  }
  #panel {
    width: calc(100vw - 40px);
    max-height: 46vh;
  }
}