:root {
  --bg: #0f1216; --panel: #171b21; --panel2: #1d222a; --line: #2a313b;
  --text: #e6e9ee; --muted: #8b95a3; --accent: #4c9ffe; --on: #35c46b; --off: #6b7280;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body { margin: 0; font: 14px/1.4 -apple-system, Segoe UI, Roboto, sans-serif; background: var(--bg); color: var(--text); }
.muted { color: var(--muted); }
.grow { flex: 1; }
button { font: inherit; background: var(--accent); color: #fff; border: 0; border-radius: 6px; padding: 7px 12px; cursor: pointer; }
button:hover { filter: brightness(1.08); }
button.ghost { background: transparent; border: 1px solid var(--line); color: var(--text); }
input, select { font: inherit; background: var(--panel2); color: var(--text); border: 1px solid var(--line); border-radius: 6px; padding: 7px 9px; }

/* login */
.login-body { display: grid; place-items: center; min-height: 100vh; }
.login-card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 28px; width: 320px; display: flex; flex-direction: column; gap: 12px; }
.login-card h1 { margin: 0; font-size: 20px; }
.login-card label { display: flex; flex-direction: column; gap: 4px; font-size: 12px; color: var(--muted); }
.login-card button { margin-top: 6px; }

/* layout */
.topbar { display: flex; align-items: center; gap: 12px; padding: 10px 16px; background: var(--panel); border-bottom: 1px solid var(--line); }
.layout { display: grid; grid-template-columns: 320px 1fr; height: calc(100vh - 49px); }
.sidebar { border-right: 1px solid var(--line); display: flex; flex-direction: column; min-height: 0; }
.sidebar-head { padding: 10px; border-bottom: 1px solid var(--line); }
.sidebar-head input { width: 100%; }
.user-list { list-style: none; margin: 0; padding: 0; overflow: auto; }
.user-row { display: flex; align-items: center; gap: 10px; padding: 9px 12px; border-bottom: 1px solid var(--line); cursor: pointer; }
.user-row:hover { background: var(--panel); }
.user-row.is-selected { background: var(--panel2); }
.user-row .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--off); flex: none; }
.user-row.is-online .dot { background: var(--on); box-shadow: 0 0 6px var(--on); }
.user-name { font-weight: 600; }
.user-sub { font-size: 12px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 240px; }

/* detail */
.detail { overflow: auto; padding: 18px 20px; }
.placeholder { color: var(--muted); display: grid; place-items: center; height: 100%; }
.detail-head { display: flex; align-items: center; gap: 12px; }
.detail-head h2 { margin: 0; font-size: 18px; }
.badge { font-size: 11px; padding: 2px 8px; border-radius: 20px; background: var(--panel2); border: 1px solid var(--line); color: var(--muted); }
.badge.on { color: #062; background: var(--on); border-color: var(--on); }
.badge.off { color: var(--muted); }
.live-win { margin: 8px 0 14px; }

.viewer { margin-bottom: 18px; background: #000; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.viewer video { display: block; width: 100%; max-height: 62vh; background: #000; outline: none; }
.viewer-bar { display: flex; align-items: center; gap: 16px; padding: 8px 12px; background: var(--panel); }
.viewer-bar label { font-size: 12px; color: var(--muted); display: flex; align-items: center; gap: 6px; }
.ctl-toggle { color: #e6b34c; }

.cols { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.cols h3 { font-size: 13px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); margin: 0 0 8px; }
.snap { border: 1px solid var(--line); border-radius: 8px; margin-bottom: 6px; overflow: hidden; }
.snap-h { display: flex; justify-content: space-between; gap: 10px; padding: 8px 10px; cursor: pointer; }
.snap-h:hover { background: var(--panel); }
.snap-body { padding: 8px 10px; border-top: 1px solid var(--line); background: var(--panel); }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.lbl { font-size: 11px; text-transform: uppercase; color: var(--muted); margin: 6px 0 3px; }
.li { padding: 2px 0; border-bottom: 1px solid #ffffff08; word-break: break-word; }
.li.act, .li.act b { color: var(--on); }

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; height: auto; }
  .cols, .grid2 { grid-template-columns: 1fr; }
}