:root {
  --bg: #10101f;
  --surface: #1a1a2e;
  --surface-2: #24243a;
  --text: #f4f4f8;
  --muted: #a3a3b8;
  --accent: #19ef83;
  --danger: #ff4d6d;
  --radius: 18px;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--text); font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif; -webkit-font-smoothing: antialiased; }
[hidden] { display: none !important; }
h1 { font-family: 'League Spartan', sans-serif; font-weight: 700; font-size: 2rem; margin: 0; letter-spacing: -0.01em; }
button { font: inherit; cursor: pointer; }

.screen { min-height: 100dvh; }

/* ---------- join ---------- */
#join-screen { display: grid; place-items: center; padding: 24px 16px calc(24px + env(safe-area-inset-bottom)); }
.join-card { width: min(440px, 100%); display: flex; flex-direction: column; gap: 16px; }
.brand { display: flex; align-items: center; gap: 12px; }
.preview { position: relative; aspect-ratio: 4 / 3; background: var(--surface); border-radius: var(--radius); overflow: hidden; }
.preview video { width: 100%; height: 100%; object-fit: cover; transform: scaleX(-1); }
.preview-status { position: absolute; inset: 0; display: grid; place-items: center; margin: 0; color: var(--muted); text-align: center; padding: 16px; }
.presence { margin: 0; min-height: 1.4em; color: var(--accent); font-weight: 600; }
form { display: flex; flex-direction: column; gap: 14px; }
label { display: flex; flex-direction: column; gap: 6px; font-size: 0.95rem; color: var(--muted); }
input { font: inherit; font-size: 1.15rem; padding: 14px 16px; border-radius: 12px; border: 2px solid var(--surface-2); background: var(--surface); color: var(--text); outline: none; }
input:focus { border-color: var(--accent); }
.primary { font-size: 1.25rem; font-weight: 600; padding: 16px; border: 0; border-radius: 14px; background: var(--accent); color: #062b17; }
.primary:disabled { opacity: 0.6; cursor: progress; }
.error { margin: 0; min-height: 1.2em; color: var(--danger); font-weight: 500; }
.room-note { margin: 0; color: var(--muted); font-size: 0.85rem; text-align: center; }

/* ---------- call ---------- */
#call-screen { position: fixed; inset: 0; display: flex; flex-direction: column; }
.grid { flex: 1; display: grid; gap: 8px; padding: 8px; padding-top: calc(8px + env(safe-area-inset-top)); grid-template-columns: repeat(var(--cols, 1), 1fr); grid-auto-rows: 1fr; min-height: 0; }
.tile { position: relative; margin: 0; background: var(--surface); border-radius: var(--radius); overflow: hidden; min-height: 0; }
.tile video { width: 100%; height: 100%; object-fit: cover; background: var(--surface); }
.tile.self video { transform: scaleX(-1); }
.tile.self.rear video { transform: none; }
.tile figcaption { position: absolute; left: 10px; bottom: 10px; display: flex; gap: 8px; align-items: center; padding: 6px 12px; border-radius: 999px; background: rgba(16, 16, 31, 0.72); font-weight: 600; font-size: 0.95rem; backdrop-filter: blur(6px); }
.tile .state { color: var(--muted); font-weight: 400; font-size: 0.85rem; }
.tile.video-off video { visibility: hidden; }
.tile.video-off::before { content: attr(data-initial); position: absolute; inset: 0; display: grid; place-items: center; font-family: 'League Spartan', sans-serif; font-size: clamp(3rem, 12vw, 7rem); color: var(--accent); }
.controls { display: flex; justify-content: center; gap: 10px; padding: 12px 8px calc(12px + env(safe-area-inset-bottom)); background: var(--bg); }
.control { display: flex; flex-direction: column; align-items: center; gap: 4px; min-width: 64px; padding: 10px 8px; border: 0; border-radius: 16px; background: var(--surface-2); color: var(--text); }
.control .icon { font-size: 1.5rem; line-height: 1; }
.control .label { font-size: 0.75rem; color: var(--muted); }
.control[aria-pressed="false"] { background: var(--danger); }
.control[aria-pressed="false"] .label { color: var(--text); }
.control.leave { background: var(--danger); }
.control.leave .icon { transform: rotate(135deg); }
.control.leave .label { color: var(--text); }
.toast { position: fixed; left: 50%; bottom: calc(110px + env(safe-area-inset-bottom)); transform: translateX(-50%); margin: 0; padding: 10px 18px; border-radius: 999px; background: var(--surface-2); box-shadow: 0 8px 30px rgba(0,0,0,.4); font-weight: 500; max-width: 90vw; text-align: center; }
@media (max-width: 420px) { .control { min-width: 56px; } }