:root {
      --bg: #000;
      --fg: #f2f0ea;
      --muted: rgba(255,255,255,.42);
      --gold: #c4a574;
      --line: rgba(255,255,255,.12);
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html, body {
      height: 100%; overflow: hidden;
      background: var(--bg); color: var(--fg);
      font-family: "Noto Sans SC", "PingFang SC", "Segoe UI", system-ui, sans-serif;
    }
    #c {
      position: fixed; inset: 0; z-index: 0;
      display: block; width: 100%; height: 100%;
    }
    .picker {
      position: fixed; z-index: 20;
      top: 0; bottom: 0; left: 0;
      width: min(310px, 40vw);
      padding: 18px 12px 24px max(14px, env(safe-area-inset-left));
      overflow-y: auto;
      background: linear-gradient(90deg, rgba(0,0,0,.94) 74%, transparent);
      scrollbar-width: thin;
    }
    .picker h1 {
      font-size: 13px; font-weight: 500; letter-spacing: .14em;
      text-transform: uppercase; color: var(--gold);
      margin: 4px 8px 6px;
    }
    .picker .lead {
      font-size: 12px; color: var(--muted); line-height: 1.55;
      margin: 0 8px 14px; max-width: 32ch;
    }
    .picker .lead b { color: rgba(255,255,255,.8); font-weight: 500; }
    .speed-box {
      margin: 0 8px 14px; padding: 10px;
      border: 1px solid var(--line); border-radius: 10px;
      background: rgba(255,255,255,.03);
    }
    .speed-box .lbl {
      font-size: 10px; letter-spacing: .16em; text-transform: uppercase;
      color: var(--gold); margin-bottom: 8px;
    }
    .speed-box .row { display: flex; gap: 6px; flex-wrap: wrap; }
    .speed-box button {
      flex: 1; min-width: 4em;
      font-family: inherit; font-size: 11px;
      color: rgba(255,255,255,.65);
      background: transparent;
      border: 1px solid rgba(255,255,255,.14);
      border-radius: 999px; padding: 6px 8px; cursor: pointer;
    }
    .speed-box button.on {
      color: #0a0806; background: var(--gold); border-color: var(--gold); font-weight: 600;
    }
    .pick {
      display: block; width: 100%; text-align: left;
      background: transparent; border: 1px solid transparent;
      border-radius: 10px; padding: 10px 12px; margin-bottom: 6px;
      color: inherit; cursor: pointer;
    }
    .pick:hover { border-color: rgba(255,255,255,.16); background: rgba(255,255,255,.03); }
    .pick.on {
      border-color: rgba(196,165,116,.55);
      background: rgba(196,165,116,.08);
    }
    .pick .n {
      font-family: ui-monospace, Consolas, monospace;
      font-size: 10px; letter-spacing: .16em; color: var(--gold); margin-bottom: 4px;
    }
    .pick .t { font-size: 14px; font-weight: 500; margin-bottom: 3px; }
    .pick .d { font-size: 11px; color: var(--muted); line-height: 1.45; }
    .tools {
      position: fixed; z-index: 22;
      top: max(14px, env(safe-area-inset-top));
      right: max(16px, env(safe-area-inset-right));
      display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end;
    }
    .tools button, .tools a {
      font-family: inherit; font-size: 11px; letter-spacing: .1em;
      color: rgba(255,255,255,.7);
      background: rgba(0,0,0,.55);
      border: 1px solid var(--line);
      border-radius: 999px; padding: 7px 14px;
      cursor: pointer; text-decoration: none;
    }
    .tools button.primary {
      color: #0a0806; background: var(--gold); border-color: var(--gold); font-weight: 600;
    }
    .rail {
      position: fixed; z-index: 18;
      right: max(14px, env(safe-area-inset-right));
      top: 50%; transform: translateY(-50%);
      display: flex; flex-direction: column; gap: 14px; align-items: flex-end;
    }
    .rail button {
      background: none; border: 0; padding: 4px 0; cursor: pointer;
      color: rgba(255,255,255,.3);
      font-family: ui-monospace, Consolas, monospace;
      font-size: 10px; letter-spacing: .18em; text-transform: uppercase;
      display: flex; align-items: center; gap: 10px;
    }
    .rail button .bar {
      width: 2px; height: 16px; background: rgba(255,255,255,.18);
      order: 2; transition: height .35s, background .25s;
    }
    .rail button .lbl { order: 1; opacity: 0; }
    .rail button.on { color: #fff; }
    .rail button.on .bar { height: 36px; background: #fff; }
    .rail button:hover .lbl, .rail button.on .lbl { opacity: 1; }
    .prog {
      position: fixed; bottom: 0; left: 0; height: 1.5px; z-index: 18;
      background: linear-gradient(90deg, rgba(255,255,255,.12), #fff);
      width: 33.33%; transition: width .55s;
    }
    .hint {
      position: fixed; z-index: 16; left: 50%; bottom: 18px;
      transform: translateX(-50%);
      font-size: 11px; letter-spacing: .1em;
      color: rgba(255,255,255,.28); white-space: nowrap;
      pointer-events: none;
    }
    /* 没有 WebGL2 时 text-three.js 会插入这块可见说明(不静默失败、不留控制台噪音) */
.gl-missing {
  position: fixed; z-index: 40; left: 50%; top: 50%; transform: translate(-50%, -50%);
  max-width: 46ch; text-align: center; padding: 14px 18px; border-radius: 10px;
  background: rgba(0, 0, 0, .88); border: 1px solid rgba(196, 165, 116, .5);
  color: var(--gold, #c4a574); font-size: 13px; line-height: 1.6;
}

@media (max-width: 720px) {
      .picker { width: 100%; height: auto; max-height: 34vh; bottom: auto; }
      .rail { display: none; }
    }