/* ============================================================
   WebRTC Private Chat — styles
   Dark, privacy-focused, zero external dependencies
   ============================================================ */

:root {
  --bg: #0b0f14;
  --bg-elevated: #131a22;
  --bg-panel: #1a232e;
  --bg-input: #0f1620;
  --border: #243140;
  --text: #e6edf3;
  --text-dim: #8b9bad;
  --text-faint: #5d6b7a;
  --accent: #2f81f7;
  --accent-hover: #4a96f9;
  --danger: #f85149;
  --danger-hover: #ff6b63;
  --success: #3fb950;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
  overflow: hidden;
}

button, input { font-family: inherit; font-size: inherit; color: inherit; }

/* ---- Views ---- */
.view { display: none; height: 100vh; }
.view--active { display: flex; }

/* ---- Lobby ---- */
#lobby {
  align-items: center;
  justify-content: center;
  padding: 24px;
  background:
    radial-gradient(ellipse at top, rgba(47, 129, 247, 0.08), transparent 50%),
    var(--bg);
}

.lobby__card {
  width: 100%;
  max-width: 460px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
}

.lobby__header { text-align: center; margin-bottom: 24px; }
.lobby__header .logo { font-size: 48px; line-height: 1; margin-bottom: 8px; }
.lobby__header h1 { font-size: 28px; font-weight: 600; letter-spacing: -0.02em; }
.subtitle { color: var(--text-dim); margin-top: 6px; font-size: 13px; }

.tabs {
  display: flex;
  gap: 4px;
  background: var(--bg-input);
  padding: 4px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
}
.tab {
  flex: 1;
  background: transparent;
  border: none;
  padding: 8px 12px;
  border-radius: 4px;
  cursor: pointer;
  color: var(--text-dim);
  font-weight: 500;
  transition: background .15s, color .15s;
}
.tab:hover { color: var(--text); }
.tab--active { background: var(--bg-panel); color: var(--text); }

.form { display: flex; flex-direction: column; gap: 14px; }
.form[hidden] { display: none; }

.field { display: flex; flex-direction: column; gap: 6px; }
.field span { font-size: 13px; color: var(--text-dim); font-weight: 500; }
.field span small { color: var(--text-faint); font-weight: 400; }
.field input {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  color: var(--text);
  outline: none;
  transition: border-color .15s;
}
.field input:focus { border-color: var(--accent); }
.field input::placeholder { color: var(--text-faint); }

.hint {
  font-size: 12px;
  color: var(--text-faint);
  background: var(--bg-input);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent);
}

.btn {
  border: none;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 500;
  transition: background .15s, opacity .15s;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn--primary { background: var(--accent); color: white; }
.btn--primary:hover:not(:disabled) { background: var(--accent-hover); }
.btn--ghost { background: transparent; color: var(--text-dim); border: 1px solid var(--border); }
.btn--ghost:hover { background: var(--bg-panel); color: var(--text); }
.btn--danger { background: transparent; color: var(--danger); border: 1px solid var(--danger); }
.btn--danger:hover { background: var(--danger); color: white; }

.error {
  background: rgba(248, 81, 73, 0.1);
  border: 1px solid var(--danger);
  color: var(--danger);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  margin-top: 12px;
}

.lobby__footer { margin-top: 24px; border-top: 1px solid var(--border); padding-top: 16px; }
.lobby__footer summary {
  cursor: pointer;
  color: var(--text-dim);
  font-size: 13px;
  user-select: none;
}
.lobby__footer summary:hover { color: var(--text); }
.lobby__footer ul { list-style: none; margin-top: 12px; font-size: 12px; color: var(--text-dim); }
.lobby__footer li { padding: 4px 0; }
.lobby__footer li strong { color: var(--text); }
.lobby__footer li::before { content: "▸ "; color: var(--accent); }

/* ---- Room ---- */
#room { flex-direction: column; }

.room-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 16px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.room-header__left { display: flex; align-items: center; gap: 12px; }
.room-header__logo { font-size: 24px; }
.room-header__title { font-weight: 600; }
.room-header__title code {
  background: var(--bg-input);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: "SF Mono", Monaco, Consolas, monospace;
  color: var(--accent);
  letter-spacing: 0.5px;
}
.room-header__sub { font-size: 12px; color: var(--text-dim); }
.room-header__right { display: flex; gap: 8px; }

.room-body {
  flex: 1;
  display: flex;
  min-height: 0;
}

.video-area {
  flex: 1;
  padding: 12px;
  overflow: auto;
  background: var(--bg);
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 12px;
  align-content: start;
}

.video-tile {
  position: relative;
  background: #000;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--border);
}
.video-tile video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.video-tile--screen { aspect-ratio: 16 / 9; grid-column: span 2; }
.video-tile__info {
  position: absolute;
  bottom: 8px;
  left: 8px;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(6px);
  padding: 4px 10px;
  border-radius: 14px;
  font-size: 12px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
}
.video-tile__info .mute-indicator { color: var(--danger); }
.video-tile__info .cam-indicator { color: var(--text-faint); }
.video-tile__info .tile-conn-state {
  font-size: 10px;
  color: var(--text-faint);
  background: rgba(255, 255, 255, 0.08);
  padding: 1px 6px;
  border-radius: 8px;
  letter-spacing: 0.3px;
}
.video-tile--connected .tile-conn-state {
  color: var(--success);
  background: rgba(63, 185, 80, 0.12);
}
.video-tile__avatar {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  color: var(--text-dim);
  background: linear-gradient(135deg, #1a232e, #131a22);
}
.video-tile--self video { transform: scaleX(-1); /* mirror */ }

/* ---- Chat ---- */
.chat {
  width: 340px;
  background: var(--bg-elevated);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}
.chat__header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}
.chat__header h2 {
  font-size: 14px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}
.chat__lock {
  font-size: 11px;
  color: var(--success);
  background: rgba(63, 185, 80, 0.1);
  padding: 2px 8px;
  border-radius: 10px;
}
.chat__log {
  flex: 1;
  overflow-y: auto;
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.chat__msg {
  background: var(--bg-panel);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  max-width: 90%;
  word-wrap: break-word;
  word-break: break-word;
}
.chat__msg--self {
  align-self: flex-end;
  background: var(--accent);
  color: white;
}
.chat__msg--system {
  align-self: center;
  background: transparent;
  color: var(--text-faint);
  font-size: 12px;
  font-style: italic;
}
.chat__msg .chat__author {
  font-size: 11px;
  font-weight: 600;
  margin-bottom: 2px;
  color: var(--text-dim);
}
.chat__msg--self .chat__author { color: rgba(255, 255, 255, 0.8); }
.chat__msg .chat__body { font-size: 13px; }
.chat__input-row {
  display: flex;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid var(--border);
}
.chat__input-row input {
  flex: 1;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  outline: none;
}
.chat__input-row input:focus { border-color: var(--accent); }

/* ---- Controls ---- */
.controls {
  display: flex;
  justify-content: center;
  gap: 12px;
  padding: 12px;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}
.control {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  min-width: 80px;
  transition: background .15s, border-color .15s;
}
.control:hover { background: var(--bg-input); }
.control__icon { font-size: 20px; }
.control__label { font-size: 11px; color: var(--text-dim); }
.control--active { background: var(--danger); border-color: var(--danger); color: white; }
.control--active .control__label { color: white; }
.control--screen-active { background: var(--success); border-color: var(--success); color: white; }
.control--screen-active .control__label { color: white; }

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .room-body { flex-direction: column; }
  .chat { width: 100%; height: 240px; border-left: none; border-top: 1px solid var(--border); }
  .video-tile--screen { grid-column: span 1; }
  .control__label { display: none; }
  .control { min-width: auto; padding: 10px 14px; }
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-faint); }

/* ---- Reconnect banner (Task 2/3: password re-prompt) ---- */
.reconnect-banner {
  font-size: 18px;
  font-weight: 600;
  color: var(--success);
  margin-bottom: 8px;
}
#reconnect-form .hint { margin: 8px 0 16px; }
#reconnect-form .btn--ghost { margin-left: 8px; }