:root {
  --ink: #f2e6cd;
  --ink-dim: #c7b18c;
  --muted: #8f7d61;
  --gold: #d9b46d;
  --gold-bright: #f1d18e;
  --panel: rgba(16, 14, 11, 0.82);
  --panel-line: rgba(217, 180, 109, 0.24);
  --panel-line-strong: rgba(217, 180, 109, 0.48);
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.55);
  --font-cn: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  --font-display: Georgia, "Times New Roman", serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: #0b0a08;
  color: var(--ink);
  font-family: var(--font-cn);
  -webkit-font-smoothing: antialiased;
}

button, input { font: inherit; }
button { color: inherit; }

#app, #stage { position: fixed; inset: 0; }
#stage { z-index: 0; cursor: grab; }
#stage:active { cursor: grabbing; }
#stage canvas { display: block; width: 100%; height: 100%; filter: saturate(1.08) contrast(1.08); }

#vignette {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 2;
  background:
    radial-gradient(ellipse at 50% 42%, transparent 42%, rgba(5, 4, 3, 0.22) 100%),
    linear-gradient(180deg, rgba(5, 4, 3, 0.18), transparent 18%, transparent 78%, rgba(5, 4, 3, 0.38));
}

#brand {
  position: fixed;
  z-index: 6;
  left: 36px;
  top: 30px;
  padding: 0;
  pointer-events: none;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.5);
}

/* 返回网站主页（右上角，避开左上角的 #brand 标题区） */
.site-home-btn {
  position: fixed;
  z-index: 7;
  right: 36px;
  top: 30px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 13px;
  border: 1px solid var(--panel-line);
  background: var(--panel);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  color: var(--ink-dim);
  font-family: var(--font-display);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-decoration: none;
  cursor: pointer;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.32);
  transition: color 0.2s, border-color 0.2s, background 0.2s, transform 0.2s;
}
.site-home-btn span { font-size: 14px; line-height: 1; }
.site-home-btn:hover {
  color: var(--gold-bright);
  border-color: var(--panel-line-strong);
  background: rgba(48, 38, 24, 0.9);
  transform: translateX(-2px);
}
@media (max-width: 720px) {
  .site-home-btn { right: 14px; top: 14px; padding: 6px 10px; font-size: 9px; letter-spacing: 0.1em; }
}
#brand .eyebrow {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.32em;
  color: var(--gold);
  margin-bottom: 8px;
}
#brand .eyebrow span { opacity: 0.6; }
#brand h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 34px;
  letter-spacing: 0.08em;
  color: #f5e9d2;
}
#brand p {
  margin: 7px 0 0;
  font-size: 10px;
  letter-spacing: 0.26em;
  color: rgba(242, 230, 205, 0.62);
}

#panel {
  position: fixed;
  z-index: 7;
  left: 36px;
  top: 132px;
  width: 342px;
  max-height: calc(100vh - 168px);
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 20px 22px 14px;
  background: var(--panel);
  border: 1px solid var(--panel-line);
  border-radius: 16px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px) saturate(110%);
  -webkit-backdrop-filter: blur(18px) saturate(110%);
  scrollbar-width: thin;
  scrollbar-color: rgba(217, 180, 109, 0.35) transparent;
  transition: transform 0.35s ease, opacity 0.35s ease;
}
#panel::-webkit-scrollbar { width: 5px; }
#panel::-webkit-scrollbar-thumb { background: rgba(217, 180, 109, 0.3); border-radius: 5px; }

.panel-toggle {
  display: none;
  position: absolute;
  right: 12px;
  top: 10px;
  width: 28px;
  height: 28px;
  border: 1px solid var(--panel-line);
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.2);
  color: var(--gold);
  cursor: pointer;
  line-height: 1;
}

.panel-section { padding: 14px 0 15px; border-bottom: 1px solid rgba(217, 180, 109, 0.12); }
.panel-section:first-of-type { padding-top: 0; }
.panel-section:last-of-type { border-bottom: 0; }

.section-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.section-kicker {
  font-family: var(--font-display);
  font-size: 9px;
  letter-spacing: 0.26em;
  color: var(--gold);
  opacity: 0.9;
}
.value { font-size: 11px; color: var(--muted); letter-spacing: 0.1em; font-variant-numeric: tabular-nums; }

.range-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  font-size: 13px;
  color: var(--ink);
  margin-bottom: 10px;
}
.range-label small { color: var(--muted); font-size: 10px; font-weight: 400; letter-spacing: 0.03em; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 3px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--gold) 0%, var(--gold) var(--fill, 0%), rgba(217, 180, 109, 0.18) var(--fill, 0%), rgba(217, 180, 109, 0.18) 100%);
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--gold-bright);
  border: 2px solid #211a10;
  box-shadow: 0 0 0 4px rgba(217, 180, 109, 0.18);
}
input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--gold-bright);
  border: 2px solid #211a10;
}
.range-ticks { display: flex; justify-content: space-between; margin-top: 7px; font-size: 9px; color: var(--muted); letter-spacing: 0.08em; }

.segmented { display: grid; grid-template-columns: repeat(4, 1fr); gap: 5px; }
.segmented button {
  padding: 8px 4px;
  border: 1px solid rgba(217, 180, 109, 0.18);
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.025);
  font-size: 11px;
  color: var(--ink-dim);
  cursor: pointer;
  transition: all 0.18s ease;
}
.segmented button:hover { border-color: var(--panel-line-strong); color: var(--ink); background: rgba(217, 180, 109, 0.08); }
.segmented button.active { background: rgba(217, 180, 109, 0.18); border-color: var(--gold); color: var(--gold-bright); }

.toggles { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 10px;
  border: 1px solid rgba(217, 180, 109, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
  font-size: 11px;
  color: var(--ink-dim);
  cursor: pointer;
  transition: all 0.18s ease;
}
.toggle:hover { border-color: var(--panel-line-strong); color: var(--ink); }
.toggle.active { border-color: rgba(217, 180, 109, 0.55); background: rgba(217, 180, 109, 0.12); color: var(--gold-bright); }
.toggle .ico { width: 14px; text-align: center; color: var(--gold); font-size: 13px; }

.info-section { padding-bottom: 12px; }
.info-section h2 {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 25px;
  letter-spacing: 0.04em;
}
.info-en { font-size: 9px; letter-spacing: 0.2em; color: var(--gold); opacity: 0.8; margin-bottom: 9px; }
.dims { font-size: 10px; color: var(--ink-dim); line-height: 1.6; margin-bottom: 9px; }
#infoText { margin: 0 0 12px; font-size: 11px; line-height: 1.8; color: rgba(242, 230, 205, 0.66); }
.focus-btn {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 9px 11px;
  border: 1px solid var(--panel-line);
  border-radius: 7px;
  background: transparent;
  color: var(--gold-bright);
  font-size: 11px;
  cursor: pointer;
  transition: all 0.18s ease;
}
.focus-btn:hover { background: rgba(217, 180, 109, 0.1); border-color: var(--gold); }

.panel-footer {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding-top: 12px;
  font-size: 9px;
  color: var(--muted);
  letter-spacing: 0.04em;
}
.fps { font-variant-numeric: tabular-nums; color: rgba(217, 180, 109, 0.45); }

/* hotspots */
#hotspots { position: fixed; inset: 0; z-index: 5; pointer-events: none; overflow: hidden; }
.hotspot {
  position: absolute;
  pointer-events: auto;
  border: 0;
  background: transparent;
  padding: 0;
  color: var(--ink);
  cursor: pointer;
  transform: translate(-50%, -50%);
  display: flex;
  align-items: center;
  gap: 9px;
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.65));
  transition: opacity 0.25s ease;
  white-space: nowrap;
}
body.labels-off .hotspot { opacity: 0; pointer-events: none; }
.hotspot .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gold-bright);
  border: 1px solid rgba(20, 16, 10, 0.9);
  box-shadow: 0 0 0 4px rgba(217, 180, 109, 0.15), 0 0 14px rgba(241, 209, 142, 0.45);
  flex: none;
}
.hotspot .label {
  display: flex;
  flex-direction: column;
  gap: 1px;
  padding: 3px 6px;
  background: rgba(10, 9, 7, 0.52);
  border: 1px solid rgba(217, 180, 109, 0.20);
  border-radius: 3px;
  backdrop-filter: blur(5px);
}
.hotspot .label b { font-family: var(--font-display); font-weight: 400; font-size: 11px; letter-spacing: 0.06em; color: #f7ebd4; }
.hotspot .label em { font-style: normal; font-size: 7px; letter-spacing: 0.14em; color: var(--gold); opacity: 0.75; }
.hotspot:hover .dot { transform: scale(1.3); }
.hotspot:hover .label { border-color: var(--gold); background: rgba(10, 9, 7, 0.82); }

#compass {
  position: fixed;
  z-index: 4;
  right: 28px;
  bottom: 26px;
  width: 58px;
  height: 58px;
  pointer-events: none;
  opacity: 0.82;
}
.compass-ring {
  position: relative;
  width: 100%;
  height: 100%;
  border: 1px solid rgba(217, 180, 109, 0.35);
  border-radius: 50%;
  background: rgba(10, 9, 7, 0.35);
  backdrop-filter: blur(6px);
}
.compass-ring::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px dashed rgba(217, 180, 109, 0.2);
  border-radius: 50%;
}
.north {
  position: absolute;
  left: 50%;
  top: -17px;
  transform: translateX(-50%);
  font-family: var(--font-display);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--gold);
}
.needle {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 2px;
  height: 22px;
  margin-left: -1px;
  margin-top: -22px;
  background: linear-gradient(180deg, var(--gold-bright), rgba(217, 180, 109, 0.1));
  transform-origin: 50% 100%;
  border-radius: 2px;
}
.needle::before {
  content: "";
  position: absolute;
  left: 50%;
  top: -3px;
  transform: translateX(-50%);
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-bottom: 7px solid var(--gold-bright);
}

#loading {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(ellipse at 50% 45%, #201a12 0%, #0b0a08 62%);
  transition: opacity 0.7s ease, visibility 0.7s ease;
}
#loading.hidden { opacity: 0; visibility: hidden; pointer-events: none; }
.loader-inner { width: min(360px, 78vw); text-align: center; }
.loader-eyebrow { font-family: var(--font-display); font-size: 10px; letter-spacing: 0.36em; color: var(--gold); margin-bottom: 14px; }
.loader-title { font-family: var(--font-display); font-size: 26px; letter-spacing: 0.08em; color: var(--ink); margin-bottom: 24px; }
.loader-bar { height: 2px; width: 100%; background: rgba(217, 180, 109, 0.16); overflow: hidden; }
#loaderFill { height: 100%; width: 0%; background: linear-gradient(90deg, #8d6a33, var(--gold-bright)); transition: width 0.2s ease; }
.loader-pct { margin-top: 10px; font-size: 10px; letter-spacing: 0.16em; color: var(--ink-dim); font-variant-numeric: tabular-nums; }
.loader-note { margin-top: 22px; font-size: 9px; letter-spacing: 0.18em; color: var(--muted); }

.noscript { position: fixed; inset: 0; display: grid; place-items: center; background: #0b0a08; z-index: 50; }

@media (max-width: 900px) {
  #brand { left: 20px; top: 18px; }
  #brand h1 { font-size: 26px; }
  #brand p { display: none; }
  #panel {
    left: 12px;
    right: 12px;
    top: auto;
    bottom: 12px;
    width: auto;
    max-height: 58vh;
    padding: 16px 16px 10px;
  }
  .panel-toggle { display: block; }
  #panel.collapsed { transform: translateY(calc(100% - 42px)); }
  #panel.collapsed::before {
    content: "点击 − 展开控制面板";
    position: absolute;
    left: 16px;
    top: 13px;
    font-size: 10px;
    letter-spacing: 0.08em;
    color: var(--gold);
  }
  #panel.collapsed .panel-section, #panel.collapsed .panel-footer { opacity: 0; pointer-events: none; }
  .panel-section { padding: 11px 0 12px; }
  .info-section h2 { font-size: 21px; }
  #infoText { display: none; }
  #compass { right: 16px; bottom: calc(58vh + 26px); width: 46px; height: 46px; }
  .hotspot .label { display: none; }
  .hotspot .dot {
    width: 12px;
    height: 12px;
    box-shadow: 0 0 0 5px rgba(217, 180, 109, 0.18), 0 0 16px rgba(241, 209, 142, 0.6);
  }
  .hotspot { padding: 9px; }
}