:root {
    --bg: #0f1419; --panel: #1a222c; --text: #e8eef4; --muted: #8b9bab;
    --accent: #1fb5a8; --danger: #e5484d; --ok: #3ccf91; --warn: #f5a524;
  }
  @media (prefers-color-scheme: light) {
    :root { --bg: #eef2f6; --panel: #ffffff; --text: #17212b; --muted: #5d6f80; }
  }
  * { box-sizing: border-box; }
  body { margin: 0; background: var(--bg); color: var(--text);
         font: 16px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
         padding: 12px max(16px, env(safe-area-inset-right)) 24px max(16px, env(safe-area-inset-left)); }
  main { max-width: 860px; margin: 0 auto; }
  header { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
  h1 { font-size: 1.15rem; margin: 0; }
  .pill { display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: 999px;
          background: var(--panel); color: var(--muted); font-size: .8rem; }
  .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); }
  .pill.on .dot { background: var(--ok); } .pill.err .dot { background: var(--danger); }
  .stage { position: relative; background: #000; border-radius: 14px; overflow: hidden; aspect-ratio: 16/9; }
  video { width: 100%; height: 100%; object-fit: contain; background: #000; display: block; }
  .overlay { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center;
             justify-content: center; gap: 8px; color: #fff; text-align: center; padding: 16px;
             background: rgba(0,0,0,.35); transition: opacity .2s; }
  .overlay.hidden { opacity: 0; pointer-events: none; }
  .overlay .big { font-size: 1.4rem; font-weight: 600; }
  .ringing .overlay { background: rgba(31,181,168,.35); animation: pulse 1s infinite; }
  @keyframes pulse { 50% { background: rgba(31,181,168,.6); } }
  @media (prefers-reduced-motion: reduce) { .ringing .overlay { animation: none; } }
  .controls { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 10px; margin: 14px 0; }
  button { font: inherit; font-weight: 600; padding: 14px 10px; border: 0; border-radius: 12px; cursor: pointer;
           background: var(--panel); color: var(--text); min-height: 48px; }
  button:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
  button:disabled { opacity: .4; cursor: not-allowed; }
  button.accept { background: var(--ok); color: #05281a; }
  button.hangup { background: var(--danger); color: #fff; }
  button.door { background: var(--warn); color: #2b1d00; }
  .ringing button.accept { animation: pulse-btn 1s infinite; }
  @keyframes pulse-btn { 50% { transform: scale(1.04); } }
  .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 8px; }
  .stat { background: var(--panel); border-radius: 10px; padding: 8px 10px; }
  .stat b { display: block; font-size: 1.05rem; font-variant-numeric: tabular-nums; }
  .stat span { color: var(--muted); font-size: .75rem; }
  details { background: var(--panel); border-radius: 10px; padding: 8px 12px; margin-top: 12px; }
  summary { cursor: pointer; color: var(--muted); }
  #log { font: 12px/1.5 ui-monospace, Consolas, monospace; max-height: 200px; overflow: auto; white-space: pre-wrap;
         margin: 8px 0 0; color: var(--muted); }
  .toast { position: fixed; left: 50%; bottom: 20px; transform: translateX(-50%); background: var(--panel);
           padding: 10px 16px; border-radius: 10px; box-shadow: 0 4px 20px rgba(0,0,0,.4); opacity: 0;
           transition: opacity .2s; pointer-events: none; }
  .toast.show { opacity: 1; }
/* login + layout additions */
.panel { background: var(--panel); border-radius: 14px; padding: 16px; max-width: 420px; margin: 40px auto; }
.panel h2 { margin: 0 0 12px; font-size: 1.05rem; }
.panel label { display: block; font-size: .85rem; color: var(--muted); margin: 10px 0 4px; }
.panel input { width: 100%; padding: 12px; border-radius: 10px; border: 1px solid #8a9bab55; background: transparent;
               color: var(--text); font: inherit; }
.panel button { width: 100%; margin-top: 14px; background: var(--accent); color: #031a18; }
.hidden { display: none !important; }
.err { color: var(--danger); min-height: 1.2em; font-size: .85rem; margin-top: 8px; }