/* ── 设计令牌 ─────────────────────────────────────────── */
:root {
  --bg: #0b0d12;
  --panel: #151924;
  --panel-2: #1b2130;
  --line: rgba(255, 255, 255, 0.08);
  --text: #e5e9f0;
  --dim: #8b93a7;
  --accent: #2563eb;
  --accent-2: #3b82f6;
  --ok: #10b981;
  --warn: #f59e0b;
  --danger: #ef4444;
  --radius: 14px;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
}
* { box-sizing: border-box; }
[hidden] { display: none !important; } /* author display 规则会压过 UA 的 hidden 映射，必须显式兜住 */
html, body { height: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
button { font-family: inherit; cursor: pointer; border: none; }
button:disabled { opacity: .45; cursor: default; }
input, select {
  font: 14px inherit; padding: 10px 12px; border-radius: 10px;
  background: #0e121b; color: var(--text); border: 1px solid var(--line);
  outline: none; transition: border-color .15s;
}
input:focus, select:focus { border-color: var(--accent-2); }
select { cursor: pointer; }
.adv summary { font-size: 12px; color: var(--dim); cursor: pointer; user-select: none; }
.adv input { width: 100%; margin-top: 6px; box-sizing: border-box; }
.pop-hint { font-size: 12px; color: var(--dim); line-height: 1.5; }
.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  padding: 6px 13px; border-radius: 999px; font-size: 12px;
  background: rgba(37, 99, 235, .15); color: #a9c4ff; border: 1px solid rgba(37, 99, 235, .4);
  transition: background .15s;
}
.chip:hover { background: rgba(37, 99, 235, .32); }

/* ── 大厅 ─────────────────────────────────────────────── */
.lobby {
  min-height: 100vh; display: flex; flex-direction: column;
  align-items: center; justify-content: center; padding: 24px;
  background:
    radial-gradient(900px 500px at 15% -10%, rgba(37, 99, 235, .18), transparent 60%),
    radial-gradient(800px 500px at 90% 110%, rgba(16, 185, 129, .10), transparent 60%),
    var(--bg);
}
.lobby-card {
  width: min(920px, 100%); background: var(--panel); border: 1px solid var(--line);
  border-radius: 20px; box-shadow: var(--shadow); padding: 28px;
}
.brand { display: flex; align-items: center; gap: 14px; margin-bottom: 22px; }
.brand-logo {
  width: 46px; height: 46px; border-radius: 13px; display: grid; place-items: center;
  font-size: 24px; font-weight: 800; color: #fff;
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  box-shadow: 0 6px 18px rgba(37, 99, 235, .4);
}
.brand h1 { margin: 0; font-size: 21px; letter-spacing: .3px; }
.brand-sub { margin: 2px 0 0; font-size: 12px; color: var(--dim); }
.lobby-main { display: grid; grid-template-columns: 1.25fr 1fr; gap: 24px; }
@media (max-width: 760px) { .lobby-main { grid-template-columns: 1fr; } }

.preview-box {
  position: relative; background: #000; border-radius: var(--radius);
  overflow: hidden; aspect-ratio: 4/3; border: 1px solid var(--line);
}
.preview-box video { width: 100%; height: 100%; object-fit: cover; transform: scaleX(-1); }
.preview-empty {
  position: absolute; inset: 0; display: grid; place-items: center;
  color: var(--dim); font-size: 13px; background: repeating-linear-gradient(45deg, #0e121b 0 14px, #10141f 14px 28px);
}
.preview-box.has-video .preview-empty { display: none; }
.preview-bar {
  position: absolute; bottom: 12px; left: 50%; transform: translateX(-50%);
  display: flex; gap: 10px; padding: 6px; border-radius: 999px;
  background: rgba(10, 12, 18, .65); backdrop-filter: blur(8px);
}

.join-form { display: flex; flex-direction: column; gap: 13px; }
.join-form label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--dim); }
.join-form .fake { flex-direction: row; align-items: center; gap: 8px; font-size: 12px; }
.primary {
  margin-top: 6px; padding: 12px; border-radius: 12px; font-size: 15px; font-weight: 600;
  color: #fff; background: linear-gradient(135deg, var(--accent), var(--accent-2));
  transition: transform .12s, box-shadow .15s;
}
.primary:hover:not(:disabled) { transform: translateY(-1px); box-shadow: 0 8px 22px rgba(37, 99, 235, .45); }
.status { min-height: 18px; font-size: 12px; color: var(--warn); }
.status.ok { color: var(--ok); }
.status.err { color: var(--danger); }
.lobby-foot { margin-top: 18px; font-size: 11px; color: var(--dim); }

/* ── 会议室骨架 ───────────────────────────────────────── */
.meeting { height: 100vh; display: flex; flex-direction: column; }
.topbar {
  height: 52px; flex: none; display: flex; align-items: center; justify-content: space-between;
  padding: 0 16px; background: rgba(21, 25, 36, .8); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line); z-index: 5;
}
.room-info { display: flex; align-items: center; gap: 10px; }
.room-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 8px var(--ok); }
.room-dot.err { background: var(--danger); box-shadow: 0 0 8px var(--danger); }
.room-name { font-weight: 600; font-size: 14px; }
.mini-btn {
  font-size: 12px; padding: 4px 10px; border-radius: 8px; color: var(--dim);
  background: transparent; border: 1px solid var(--line); transition: all .15s;
}
.mini-btn:hover { color: var(--text); border-color: var(--accent-2); }
.top-right { display: flex; gap: 8px; }
.pill {
  font-size: 12px; color: var(--dim); padding: 4px 12px; border-radius: 999px;
  background: var(--panel-2); border: 1px solid var(--line); font-variant-numeric: tabular-nums;
}

/* ── 舞台与宫格 ───────────────────────────────────────── */
.stage-wrap { flex: 1; min-height: 0; display: flex; flex-direction: column; padding: 14px; gap: 12px; position: relative; }
.stage { flex: 1; min-height: 0; display: flex; gap: 12px; }
.stage .tile { flex: 1; aspect-ratio: auto; }
/* 有分享时：主舞台在上，其他人收进底部缩略条（商用主讲模式） */
.stage:not([hidden]) ~ .grid {
  flex: none; display: flex; gap: 10px; overflow-x: auto; padding-bottom: 2px;
}
.stage:not([hidden]) ~ .grid .tile { flex: none; width: 168px; }

.grid {
  flex: 1; min-height: 0; display: grid; gap: 12px; align-content: center; justify-content: center;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr));
}
.grid[data-count="1"] { grid-template-columns: minmax(0, 760px); }
.grid[data-count="2"] { grid-template-columns: repeat(2, minmax(0, 560px)); }
.grid[data-count="3"], .grid[data-count="4"] { grid-template-columns: repeat(2, minmax(0, 480px)); }
.grid[data-count="5"], .grid[data-count="6"] { grid-template-columns: repeat(3, minmax(0, 380px)); }
.grid[data-count="7"], .grid[data-count="8"], .grid[data-count="9"] { grid-template-columns: repeat(3, minmax(0, 320px)); }
.grid[data-count]:not([data-count="1"]):not([data-count="2"]):not([data-count="3"]):not([data-count="4"]):not([data-count="5"]):not([data-count="6"]):not([data-count="7"]):not([data-count="8"]):not([data-count="9"]) {
  grid-template-columns: repeat(4, minmax(0, 300px));
}

.tile {
  position: relative; background: #000; border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line); aspect-ratio: 16/9; transition: box-shadow .2s, transform .2s;
}
.tile:hover { box-shadow: 0 8px 26px rgba(0, 0, 0, .5); }
.tile video { width: 100%; height: 100%; object-fit: cover; display: block; }
/* 分享内容（屏幕/mp4）用 letterbox：任何容器比例下完整可见；摄像头保持
   cover 裁切填满（商用惯例：人是主体，内容不能裁）。舞台容器比例≈窗口
   剩余空间（非 16:9），cover 会裁掉分享画面上下边缘。 */
.tile.aux video { object-fit: contain; }
/* 仅真实摄像头的本地镜像；假媒体画布/分享内容（.nomirror）不镜像 */
.tile.local:not(.aux):not(.nomirror) video { transform: scaleX(-1); }
.tile .name {
  position: absolute; left: 10px; bottom: 10px; font-size: 12px; color: #fff;
  background: rgba(8, 10, 15, .6); padding: 4px 10px; border-radius: 8px;
  backdrop-filter: blur(6px); max-width: 70%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.tile .badge {
  position: absolute; right: 10px; top: 10px; font-size: 11px; color: #fff;
  background: rgba(37, 99, 235, .85); padding: 3px 9px; border-radius: 7px;
}
.tile.local .badge { background: rgba(16, 185, 129, .85); }
.tile.aux .badge { background: rgba(245, 158, 11, .9); }

.empty-hint {
  position: absolute; inset: 0; display: grid; place-content: center; text-align: center;
  color: var(--text); font-size: 15px; pointer-events: none;
}
.empty-hint .dim { color: var(--dim); font-size: 13px; }

/* ── 底部控制栏 ───────────────────────────────────────── */
.controlbar {
  flex: none; display: flex; align-items: center; justify-content: center; gap: 10px;
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom));
  background: rgba(21, 25, 36, .8); backdrop-filter: blur(10px); border-top: 1px solid var(--line);
}
.controlbar .sep { width: 1px; height: 24px; background: var(--line); }
.ctl {
  min-width: 46px; height: 46px; padding: 0 14px; border-radius: 13px; font-size: 13px;
  background: var(--panel-2); color: var(--text); border: 1px solid var(--line);
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  transition: background .15s, transform .12s;
}
.ctl:hover:not(:disabled) { background: #232a3c; transform: translateY(-1px); }
.ctl.off { background: rgba(239, 68, 68, .18); border-color: rgba(239, 68, 68, .5); color: #fca5a5; }
.ctl.active { background: rgba(245, 158, 11, .18); border-color: rgba(245, 158, 11, .55); color: #fcd34d; }
.ctl.danger { background: var(--danger); border-color: var(--danger); color: #fff; font-weight: 600; }
.ctl.danger:hover:not(:disabled) { background: #dc2626; }
.ctl svg, .icon-btn svg { width: 20px; height: 20px; display: block; }
.icon-btn {
  width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center;
  background: rgba(255, 255, 255, .1); color: #fff; transition: background .15s;
}
.icon-btn:hover { background: rgba(255, 255, 255, .22); }
.icon-btn.off { background: var(--danger); }

/* ── Toast ────────────────────────────────────────────── */
.toasts {
  position: fixed; top: 64px; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; gap: 8px; z-index: 50; pointer-events: none;
}
.toast {
  padding: 9px 18px; border-radius: 999px; font-size: 13px; color: var(--text);
  background: rgba(27, 33, 48, .92); border: 1px solid var(--line);
  box-shadow: 0 8px 24px rgba(0, 0, 0, .4); backdrop-filter: blur(8px);
  animation: toast-in .22s ease-out; transition: opacity .3s, transform .3s;
}
.toast.err { border-color: rgba(239, 68, 68, .55); color: #fca5a5; }
.toast.bye { opacity: 0; transform: translateY(-8px); }
@keyframes toast-in { from { opacity: 0; transform: translateY(-8px); } }

/* ── 日志抽屉（藏在顶栏按钮后，默认收摈） ──────────────────── */
.logwrap[open] {
  position: fixed; right: 14px; bottom: 76px; width: min(460px, 92vw); z-index: 40;
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  box-shadow: var(--shadow); font-size: 12px; color: var(--dim);
}
.logwrap:not([open]) { position: fixed; right: 14px; bottom: 76px; }
.logwrap:not([open]) summary {
  padding: 6px 12px; border-radius: 999px; background: var(--panel);
  border: 1px solid var(--line); font-size: 12px;
}
.logwrap summary { padding: 10px 14px; cursor: pointer; user-select: none; }
#log {
  margin: 0; padding: 10px 14px; max-height: 260px; overflow-y: auto;
  white-space: pre-wrap; word-break: break-all; color: #9fd0a3;
  font: 11px/1.55 ui-monospace, Menlo, monospace; border-top: 1px solid var(--line);
}