:root {
  --bg: #070a12;
  --panel: rgba(14, 20, 34, 0.82);
  --panel-border: rgba(96, 140, 200, 0.22);
  --accent: #38bdf8;
  --accent2: #22d3ee;
  --text: #dbe6f5;
  --text-dim: #8fa3c0;
  --danger: #f87171;
  --amber: #ffb454;
  --cyan: #7ec8e3;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", -apple-system, "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(120% 100% at 50% 0%, #0b1220 0%, var(--bg) 60%, #05070d 100%);
  -webkit-font-smoothing: antialiased;
}
#app { position: fixed; inset: 0; }
#viewer { position: absolute; inset: 0; }
#viewer canvas { display: block; }
#viewer .label-layer { position: absolute; inset: 0; pointer-events: none; }

/* ---------- 顶栏 ---------- */
#topbar {
  position: absolute; top: 0; left: 0; right: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 14px 20px;
  background: linear-gradient(180deg, rgba(7,10,18,.9), rgba(7,10,18,0));
}
.brand { display: flex; align-items: center; gap: 12px; pointer-events: none; }
#btn-menu { display: none; pointer-events: auto; }
#mobile-bar, #backdrop, .side-head { display: none; }
.logo {
  width: 40px; height: 40px; border-radius: 10px;
  display: grid; place-items: center;
  font-size: 20px; font-weight: 800; color: #fff;
  background: linear-gradient(135deg, #f43f5e, #fb923c);
  box-shadow: 0 0 18px rgba(251,146,60,.45);
}
.brand h1 { font-size: 19px; letter-spacing: .5px; }
.brand h1 .sub { color: var(--accent); font-weight: 600; font-size: 13px; letter-spacing: 2px; }
.brand p { font-size: 11px; color: var(--text-dim); margin-top: 2px; }
#top-tools { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

.chip {
  border: 1px solid var(--panel-border);
  background: var(--panel);
  color: var(--text);
  font-size: 12px; padding: 7px 13px; border-radius: 999px;
  cursor: pointer; transition: all .18s;
}
.chip:hover { border-color: var(--accent); color: #fff; }
.chip:disabled { opacity: .45; cursor: default; }
.chip:disabled:hover { border-color: var(--panel-border); color: var(--text); }
.chip.active {
  background: linear-gradient(135deg, rgba(56,189,248,.25), rgba(34,211,238,.18));
  border-color: var(--accent); color: var(--accent2);
  box-shadow: 0 0 14px rgba(56,189,248,.35);
}
.chip.primary { background: var(--accent); border-color: var(--accent); color: #06213a; font-weight: 600; }
.chip.primary:hover { filter: brightness(1.12); }
.divider { width: 1px; height: 22px; background: var(--panel-border); margin: 0 4px; }

/* ---------- 侧栏 ---------- */
#sidebar {
  position: absolute; top: 76px; left: 16px; bottom: 48px; z-index: 15;
  width: 248px; overflow-y: auto;
  background: var(--panel); border: 1px solid var(--panel-border);
  border-radius: 14px; padding: 14px;
  backdrop-filter: blur(10px);
}
#sidebar::-webkit-scrollbar { width: 6px; }
#sidebar::-webkit-scrollbar-thumb { background: rgba(120,150,200,.25); border-radius: 3px; }
#sidebar section + section { margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--panel-border); }
#sidebar h2 { font-size: 12px; color: var(--accent2); letter-spacing: 1px; margin-bottom: 10px; text-transform: uppercase; }
#sidebar h2 small { color: var(--text-dim); text-transform: none; letter-spacing: 0; font-weight: 400; }
#step-list { list-style: none; counter-reset: step; }
#step-list li {
  counter-increment: step;
  display: flex; gap: 10px; align-items: flex-start;
  padding: 9px 10px; border-radius: 9px; cursor: pointer;
  font-size: 12.5px; line-height: 1.5; transition: background .15s;
}
#step-list li:hover { background: rgba(56,189,248,.08); }
#step-list li.active { background: rgba(56,189,248,.15); }
#step-list li.active .step-no { background: var(--accent); color: #06213a; }
.step-no {
  flex: none; width: 22px; height: 22px; border-radius: 50%;
  display: grid; place-items: center; font-size: 11px; font-weight: 700;
  background: rgba(120,150,200,.18); color: var(--text-dim);
}
#part-list { list-style: none; }
#part-list li {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 9px; border-radius: 8px; cursor: pointer;
  font-size: 12.5px; color: var(--text); transition: background .15s;
}
#part-list li:hover { background: rgba(56,189,248,.08); }
#part-list li.selected { background: rgba(56,189,248,.18); color: var(--accent2); }
.pdot { width: 10px; height: 10px; border-radius: 50%; flex: none; border: 1px solid rgba(255,255,255,.25); }

#legend ul { list-style: none; }
#legend li { display: flex; align-items: center; gap: 8px; font-size: 11.5px; color: var(--text-dim); padding: 3px 0; }
#legend .pdot { width: 9px; height: 9px; }

/* ---------- 信息面板 ---------- */
#info {
  position: absolute; top: 76px; right: 16px; z-index: 15;
  width: 300px; max-height: calc(100vh - 140px); overflow-y: auto;
  background: var(--panel); border: 1px solid var(--panel-border);
  border-radius: 14px; padding: 16px;
  backdrop-filter: blur(10px);
  animation: slideIn .25s ease;
}
@keyframes slideIn { from { opacity: 0; transform: translateX(16px); } to { opacity: 1; transform: none; } }
#info::-webkit-scrollbar { width: 6px; }
#info::-webkit-scrollbar-thumb { background: rgba(120,150,200,.25); border-radius: 3px; }
.info-head { display: flex; justify-content: space-between; align-items: center; }
#info-chip {
  font-size: 10.5px; letter-spacing: 1px; color: #06213a; font-weight: 700;
  background: var(--accent2); padding: 3px 9px; border-radius: 999px;
}
#info-close { background: none; border: none; color: var(--text-dim); font-size: 18px; cursor: pointer; line-height: 1; }
#info-close:hover { color: #fff; }
#info h3 { font-size: 16px; margin: 10px 0 8px; }
#info-desc { font-size: 12.5px; line-height: 1.75; color: var(--text-dim); }
#info-desc p + p { margin-top: 8px; }
#info-desc b { color: var(--accent2); font-weight: 600; }
#info-specs { margin: 12px 0; }
#info-specs div { display: flex; justify-content: space-between; gap: 12px; padding: 6px 0; border-bottom: 1px dashed rgba(96,140,200,.18); font-size: 12px; }
#info-specs dt { color: var(--text-dim); }
#info-specs dd { color: #fff; text-align: right; font-weight: 500; }
.btn-primary {
  width: 100%; padding: 9px; border: none; border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #06213a; font-weight: 700; font-size: 13px; cursor: pointer;
  transition: filter .15s;
}
.btn-primary:hover { filter: brightness(1.12); }

/* ---------- 教学旁白 ---------- */
#narrator {
  position: absolute; left: 50%; bottom: 54px; transform: translateX(-50%);
  z-index: 15; width: min(560px, calc(100vw - 340px));
  background: var(--panel); border: 1px solid var(--panel-border);
  border-radius: 14px; padding: 14px 16px; backdrop-filter: blur(10px);
  animation: fadeUp .25s ease;
}
@keyframes fadeUp { from { opacity: 0; transform: translate(-50%, 12px); } to { opacity: 1; transform: translate(-50%, 0); } }
.narr-step { font-size: 10.5px; letter-spacing: 1px; color: var(--accent); font-weight: 700; }
.narr-body h3 { font-size: 14.5px; margin: 4px 0 6px; }
.narr-body p { font-size: 12.5px; line-height: 1.75; color: var(--text-dim); }
#narr-prev, #narr-next { margin-top: 10px; }
#narr-next { float: right; }

/* ---------- 发射控制 ---------- */
#launch-ui {
  position: absolute; left: 50%; bottom: 20px; transform: translateX(-50%);
  z-index: 15; width: 380px;
  background: var(--panel); border: 1px solid var(--panel-border);
  border-radius: 14px; padding: 12px 16px; backdrop-filter: blur(10px);
}
.l-head { display: flex; justify-content: space-between; font-size: 12px; color: var(--text-dim); margin-bottom: 8px; }
#l-phase { color: var(--accent2); font-weight: 600; }
.l-bar { height: 5px; background: rgba(120,150,200,.18); border-radius: 3px; overflow: hidden; }
#l-progress { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent), var(--accent2)); transition: width .1s linear; }
.l-btns { display: flex; gap: 8px; margin-top: 10px; }
.l-btns .btn-primary { width: auto; flex: 1; }
.l-btns .chip { flex: 0 0 auto; }

/* ---------- 底部提示 ---------- */
#hint {
  position: absolute; bottom: 14px; left: 16px; z-index: 12;
  font-size: 11px; color: var(--text-dim); pointer-events: none;
  display: flex; flex-direction: column; gap: 3px;
}
#hint-extra { color: var(--accent); }

/* ---------- CSS2D 标签 ---------- */
.zq-label {
  transform: translateY(-6px);
  background: rgba(6,10,20,.72);
  border: 1px solid rgba(56,189,248,.45);
  color: #dff4ff; font-size: 11px;
  padding: 2px 8px; border-radius: 6px;
  white-space: nowrap; pointer-events: none;
  backdrop-filter: blur(4px);
  transition: opacity .15s;
}
.zq-label .dot { display:inline-block; width:6px; height:6px; border-radius:50%; margin-right:5px; vertical-align:1px; }
.zq-label.hot { box-shadow: 0 0 10px rgba(56,189,248,.6); color:#fff; }

/* ---------- 发射中旁白上移（避免与发射面板重叠） ---------- */
body.in-launch #narrator { bottom: 170px; }

/* ---------- 移动端适配 ---------- */
@media (max-width: 820px) {
  #topbar { padding: 10px 12px; }
  #btn-menu { display: inline-flex; }
  #top-tools { display: none; }
  .brand { gap: 8px; }
  .logo { width: 32px; height: 32px; font-size: 16px; border-radius: 8px; }
  .brand h1 { font-size: 15px; }
  .brand h1 .sub { font-size: 10px; }
  .brand p { display: none; }

  /* 移动端底部工具栏 */
  #mobile-bar {
    display: flex; justify-content: center; align-items: center; flex-wrap: wrap;
    gap: 6px; position: fixed; left: 0; right: 0; bottom: 0; z-index: 20;
    padding: 8px 10px calc(8px + env(safe-area-inset-bottom));
    background: linear-gradient(0deg, rgba(7,10,18,.95), rgba(7,10,18,.55) 75%, transparent);
  }
  #mobile-bar .chip { padding: 6px 11px; font-size: 11.5px; }

  /* 侧栏 → 抽屉 */
  #sidebar {
    top: 0; left: 0; bottom: 0; width: min(80vw, 300px);
    border-radius: 0 16px 16px 0; z-index: 45;
    transform: translateX(-105%);
    transition: transform .25s ease;
    padding-top: 8px;
  }
  #sidebar.open { transform: translateX(0); }
  .side-head {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 10px;
  }
  .side-head h2 { margin-bottom: 0; }
  #backdrop {
    display: block; position: fixed; inset: 0; z-index: 40;
    background: rgba(0,0,0,.55); opacity: 0; pointer-events: none;
    transition: opacity .25s;
  }
  #backdrop.show { opacity: 1; pointer-events: auto; }

  /* 信息面板 → 底部弹层 */
  #info {
    top: auto; bottom: 0; left: 0; right: 0; width: auto;
    max-height: 46vh; border-radius: 16px 16px 0 0;
    z-index: 30; padding-bottom: calc(16px + env(safe-area-inset-bottom));
    animation: sheetUp .25s ease;
  }
  @keyframes sheetUp { from { transform: translateY(100%); } to { transform: none; } }
  #info:not([hidden]) ~ #narrator { display: none; }

  /* 旁白 / 发射面板 */
  #narrator {
    width: calc(100vw - 20px); bottom: calc(64px + env(safe-area-inset-bottom));
  }
  body.in-launch #narrator { bottom: calc(150px + env(safe-area-inset-bottom)); }
  #launch-ui {
    width: calc(100vw - 20px);
    bottom: calc(58px + env(safe-area-inset-bottom));
    padding: 10px 12px;
  }

  #hint { display: none; }
  .zq-label { font-size: 9px; padding: 1px 6px; }
  #sidebar section + section { margin-top: 12px; padding-top: 10px; }
}