:root {
  --bg: #0e1116;
  --panel: #161b22;
  --border: #2a3038;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #2f81f7;
  --ok: #2ea043;
  --warn: #d29922;
  --danger: #f85149;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Microsoft YaHei", sans-serif; }

.screen { display: none; height: 100vh; flex-direction: column; }
.screen.active { display: flex; }

/* 登录 */
#login { align-items: center; justify-content: center; }
.login-card { background: var(--panel); border: 1px solid var(--border); border-radius: 14px;
  padding: 32px; width: 320px; display: flex; flex-direction: column; gap: 14px; }
.login-card h1 { margin: 0; font-size: 22px; }
.login-card .sub { margin: 0; color: var(--muted); font-size: 13px; }
.login-card input { padding: 10px 12px; border-radius: 8px; border: 1px solid var(--border);
  background: #0d1117; color: var(--text); outline: none; }
.login-card input:focus { border-color: var(--accent); }
.login-card button { padding: 10px; border: 0; border-radius: 8px; background: var(--accent);
  color: #fff; font-weight: 600; cursor: pointer; }
.error { color: var(--danger); font-size: 13px; min-height: 16px; }

/* 顶栏 */
.topbar { display: flex; align-items: center; gap: 14px; padding: 12px 18px;
  border-bottom: 1px solid var(--border); background: var(--panel); }
.brand { font-weight: 700; }
.topbar .status { margin-left: auto; display: flex; align-items: center; gap: 6px;
  color: var(--muted); font-size: 13px; }
.ghost { background: transparent; border: 1px solid var(--border); color: var(--text);
  padding: 6px 12px; border-radius: 8px; cursor: pointer; }
.ghost:hover { border-color: var(--accent); }
.dot { width: 9px; height: 9px; border-radius: 50%; background: #6e7681; display: inline-block; }
.dot.on { background: var(--ok); box-shadow: 0 0 6px var(--ok); }

/* 设备墙 */
.device-grid { padding: 18px; display: grid; gap: 14px; overflow: auto;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.tile { background: var(--panel); border: 1px solid var(--border); border-radius: 12px;
  padding: 16px; cursor: pointer; transition: .15s; }
.tile:hover { border-color: var(--accent); transform: translateY(-2px); }
.tile.offline { opacity: .5; cursor: default; }
.tile.offline:hover { transform: none; border-color: var(--border); }
.tile-top { display: flex; align-items: center; gap: 8px; font-weight: 600; }
.tile-model { color: var(--muted); font-size: 12px; margin: 8px 0; }
.badges { display: flex; gap: 6px; flex-wrap: wrap; }
.badge { font-size: 11px; padding: 2px 8px; border-radius: 20px; border: 1px solid var(--border); }
.badge.ok { color: var(--ok); border-color: rgba(46, 160, 67, .4); }
.badge.warn { color: var(--warn); border-color: rgba(210, 153, 34, .4); }
.empty { padding: 40px; text-align: center; color: var(--muted); }

/* 控制画面 */
.viewer-body { flex: 1; display: flex; min-height: 0; }
.screen-wrap { flex: 1; display: flex; align-items: center; justify-content: center;
  background: #000; min-width: 0; }
#remoteVideo { max-width: 100%; max-height: 100%; background: #000; cursor: crosshair; }
.controls { width: 200px; border-left: 1px solid var(--border); background: var(--panel);
  padding: 14px; display: flex; flex-direction: column; gap: 10px; }
.controls button { padding: 10px; border: 1px solid var(--border); border-radius: 8px;
  background: #0d1117; color: var(--text); cursor: pointer; }
.controls button:hover { border-color: var(--accent); }
.controls .hint { color: var(--muted); font-size: 12px; margin-top: auto; line-height: 1.5; }