:root {
  --bg: #0b1220;
  --panel: rgba(15, 23, 42, 0.82);
  --panel-border: rgba(125, 211, 252, 0.25);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif; }
#map { position: absolute; inset: 0; background: #0b1220; z-index: 1; }

/* 标注层（注入到地图容器内，z-index 仅高于瓦片，低于弹窗） */
#labels { position: absolute; inset: 0; pointer-events: none; z-index: 5; overflow: hidden; }
/* 「四大」盆地：实心徽章式标签，字号大、白色粗体、带描边与阴影 */
.lbl {
  position: absolute; transform: translate(-50%, -50%);
  font-size: 13px; line-height: 1.1; white-space: nowrap;
  padding: 3px 8px; border-radius: 5px; pointer-events: auto; cursor: pointer;
  background: rgba(2, 6, 23, 0.62); color: #fff; font-weight: 700;
  text-shadow: 0 1px 2px #000; will-change: transform;
  border: 1px solid rgba(255,255,255,0.30);
  box-shadow: 0 2px 8px rgba(0,0,0,0.5);
  z-index: 4;
}
.lbl .dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; margin-right: 5px; vertical-align: 1px; box-shadow: 0 0 0 1px rgba(0,0,0,0.35); }
/* 其他盆地：纯文字标签（无底框），字号更小更轻，靠描边阴影保证可读性 —— 与四大徽章形成层级差 */
.lbl.small-basin {
  font-size: 11px; font-weight: 700; color: #f6fbff; letter-spacing: .2px;
  padding: 1px 3px; background: transparent; border: none; box-shadow: none;
  text-shadow: 0 0 4px #000, 0 0 8px rgba(0,0,0,0.92), 0 1px 2px #000, 0 -1px 2px rgba(0,0,0,0.8);
  z-index: 3;
}
.lbl.small-basin .dot { width: 5px; height: 5px; margin-right: 4px; box-shadow: 0 0 0 1px rgba(0,0,0,0.4); }
.lbl:hover { background: rgba(2, 6, 23, 0.88); border-color: #fff; }
.lbl.small-basin:hover { color: #fff; text-shadow: 0 0 8px #38bdf8, 0 1px 3px #000; }

/* 通用面板 */
.panel {
  position: absolute; z-index: 10; color: var(--text);
  background: var(--panel); border: 1px solid var(--panel-border);
  border-radius: 12px; backdrop-filter: blur(10px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.45);
}

/* 顶部栏：标题 + 搜索 */
.topbar {
  position: absolute; top: 0; left: 0; right: 0; z-index: 12;
  display: flex; justify-content: space-between; align-items: flex-start;
  gap: 12px; padding: 12px 16px; pointer-events: none;
}
.topbar .brand { pointer-events: auto; }
.topbar .brand { max-width: 380px; }
.topbar .brand h1 { margin: 0; font-size: 18px; letter-spacing: .5px; color: var(--text); text-shadow: 0 1px 6px rgba(0,0,0,.6); }
.topbar .brand .sub { margin: 6px 0 0; font-size: 12px; color: var(--muted); text-shadow: 0 1px 4px rgba(0,0,0,.6); }

/* 控制面板：高度不超过地图可视区（顶部留 80px、底部留 16px），内容区可滚动 */
.ctrl-panel {
  top: 80px; left: 16px; width: 280px; padding: 0; z-index: 11;
  max-height: calc(100vh - 96px);
  display: flex; flex-direction: column;
}
.ctrl-head {
  flex: 0 0 auto;
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 14px; font-size: 13px; font-weight: 700; border-bottom: 1px solid var(--panel-border);
}
.ctrl-head button {
  background: transparent; border: 1px solid var(--panel-border); color: var(--muted);
  width: 24px; height: 24px; border-radius: 6px; cursor: pointer; line-height: 1;
  font-size: 17px; font-weight: 600; padding: 0 0 2px;
  display: inline-flex; align-items: center; justify-content: center;
  transition: color .15s, border-color .15s, background .15s;
}
.ctrl-head button:hover { color: #fff; border-color: #f87171; background: rgba(248,113,113,0.18); }
/* 面板关闭：整体隐藏，由「重新打开」按钮唤回 */
.ctrl-panel.is-closed { display: none; }
.ctrl-open {
  display: none; position: absolute; z-index: 11; top: 80px; left: 16px;
  align-items: center; gap: 6px; padding: 8px 12px; cursor: pointer;
  font-size: 12.5px; font-weight: 600; color: var(--text);
  background: var(--panel); border: 1px solid var(--panel-border);
  border-radius: 10px; backdrop-filter: blur(10px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.45);
}
.ctrl-open::before { content: "☰"; font-size: 13px; color: var(--accent); }
.ctrl-open:hover { border-color: var(--accent); }
.ctrl-open.show { display: inline-flex; }
.ctrl-body { padding: 10px 14px; font-size: 13px; overflow-y: auto; flex: 1 1 auto; }
.ctrl-body.collapsed { display: none; }
.row { display: flex; align-items: center; gap: 8px; padding: 5px 0; cursor: pointer; }
.row input { accent-color: var(--accent); }
.swatch.basin { background: linear-gradient(90deg, #f59e0b, #22d3ee, #f472b6); width: 16px; height: 10px; border-radius: 3px; border: 1px solid rgba(255,255,255,.5); }
.swatch.dot { background: #cbd5e1; width: 8px; height: 8px; border-radius: 50%; }
.swatch.dot2 { background: transparent; border: 1px dashed #94a3b8; width: 14px; height: 0; }
.bm-title { font-size: 12px; color: var(--muted); margin: 2px 0 6px; }
.bm-seg { display: flex; gap: 6px; margin-bottom: 4px; }
.bm-opt {
  flex: 1 1 0; display: flex; align-items: center; justify-content: center; gap: 5px;
  padding: 6px 2px; font-size: 12px; cursor: pointer; color: var(--muted);
  background: rgba(2,6,23,0.35); border: 1px solid var(--panel-border); border-radius: 8px;
}
.bm-opt input { accent-color: var(--accent); margin: 0; }
.bm-opt.active { color: var(--text); border-color: var(--accent); background: rgba(8,145,178,0.16); }
.divider { height: 1px; background: var(--panel-border); margin: 10px 0; }
.cnt-box {
  font-size: 12px; color: var(--text); margin: 2px 0;
  background: rgba(56,189,248,0.08); border: 1px solid var(--panel-border);
  border-radius: 8px; padding: 6px 10px;
}
.legend-note { font-size: 11.5px; color: var(--muted); line-height: 1.7; }
.legend-note b { color: var(--text); }

/* 站内导航按钮（作品介绍 / 全部地图） */
.ctrl-nav { display: flex; gap: 8px; margin: 4px 0 8px; }
.ctrl-nav a {
  flex: 1 1 0; display: flex; align-items: center; justify-content: center;
  padding: 6px 8px; border-radius: 8px; text-decoration: none;
  font-size: 12.5px; font-weight: 600; color: var(--text);
  background: rgba(2,6,23,0.35); border: 1px solid var(--panel-border);
  transition: color .15s, border-color .15s, background .15s;
}
.ctrl-nav a:hover { color: var(--accent); border-color: var(--accent); background: rgba(8,145,178,0.16); }

/* 盆地盘点列表 */
.basin-group-title { font-size: 12px; font-weight: 700; color: var(--accent); margin: 10px 0 4px; letter-spacing: 1px; }
.basin-list { list-style: none; margin: 0; padding: 0; }
.basin-list li {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 8px; margin: 2px 0; border-radius: 8px; cursor: pointer;
  transition: background .15s;
}
.basin-list li:hover, .basin-list li.active { background: rgba(56,189,248,0.15); }
.basin-list .cdot { width: 10px; height: 10px; border-radius: 3px; flex: 0 0 auto; border: 1px solid rgba(255,255,255,.55); }
.basin-list .bname { flex: 1 1 auto; color: #f8fafc; font-weight: 600; font-size: 13px; }
.basin-list .barea { color: var(--muted); font-size: 11px; font-variant-numeric: tabular-nums; white-space: nowrap; }
.basin-list .b4 {
  font-size: 10px; padding: 1px 5px; border-radius: 999px; flex: 0 0 auto;
  background: rgba(245,158,11,0.2); color: #fcd34d; border: 1px solid rgba(245,158,11,0.4);
}

/* maplibre popup 暗色化 */
.maplibregl-popup { z-index: 30 !important; }   /* 必须高于 #labels(5)，避免被盆地名称遮挡 */
.maplibregl-popup-content {
  background: var(--panel) !important; color: var(--text) !important;
  border: 1px solid var(--panel-border); border-radius: 10px; font-size: 13px; padding: 12px 14px;
}
.maplibregl-popup-tip { border-top-color: var(--panel) !important; border-bottom-color: var(--panel) !important; }
.pop h3 { margin: 0 0 6px; font-size: 15px; }
.pop .lv { font-size: 11px; padding: 1px 7px; border-radius: 999px; margin-left: 6px; white-space: nowrap; }
.pop .lv.big4 { background: rgba(245,158,11,0.28); color: #fcd34d; }
.pop .lv.other { background: rgba(56,189,248,0.25); color: #bae6fd; }
.pop table { border-collapse: collapse; margin-top: 4px; }
.pop td { padding: 2px 0; vertical-align: top; }
.pop td.k { color: var(--muted); padding-right: 10px; white-space: nowrap; }
.pop table.kv { width: 100%; }
.pop table.kv td.k { text-align: right; font-variant-numeric: tabular-nums; }
.pop table.kv td:not(.k) { font-variant-numeric: tabular-nums; max-width: 210px; word-break: break-word; }
.pop .fact { margin-top: 8px; padding: 7px 9px; border-radius: 8px; font-size: 12px; line-height: 1.65;
  color: #dbeafe; background: rgba(56,189,248,0.1); border: 1px solid rgba(56,189,248,0.25); }
.pop .fact b { color: #7dd3fc; }

@media (max-width: 720px) {
  .topbar { flex-direction: column; align-items: stretch; gap: 8px; padding: 8px 10px; }
  .topbar .brand { max-width: none; }
  .topbar .brand h1 { font-size: 15px; }
  .topbar .brand .sub { font-size: 10.5px; margin-top: 3px; line-height: 1.4; }

  /* 控制面板 -> 底部抽屉（上拉出现） */
  .ctrl-panel {
    top: auto; left: 0; right: 0; bottom: 0; width: auto;
    border-radius: 16px 16px 0 0; max-height: 72vh; overflow-y: auto;
    transform: translateY(calc(100% - 46px)); transition: transform .3s ease;
    z-index: 20;
  }
  .ctrl-panel.open { transform: translateY(0); }
  .ctrl-head {
    cursor: pointer; user-select: none; padding: 12px 14px 10px;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
  }
  .ctrl-head span { color: var(--text); font-size: 13px; }
  .ctrl-head::before {
    content: ""; display: block; flex: 0 0 auto; width: 40px; height: 4px; border-radius: 999px;
    background: var(--muted); opacity: .55; margin: 0 auto 9px;
  }
  #ctrlToggle { display: none; }
  .ctrl-open {
    top: auto; left: 50%; bottom: 12px; transform: translateX(-50%);
    padding: 9px 16px; border-radius: 999px;
  }
  .ctrl-body { font-size: 12.5px; }
  .maplibregl-ctrl-bottom-right { bottom: 52px; }
  .pop table.kv td:not(.k) { max-width: 150px; }
  .lbl { font-size: 11.5px; }
  .lbl.small-basin { font-size: 10px; }
}