:root {
  --bg-dark: #0b0f19;
  --bg-surface: #111827;
  --bg-card: #1f2937;
  --bg-control: #374151;
  --text-main: #f9fafb;
  --text-muted: #9ca3af;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --success: #10b981;
  --border-color: #374151;
}

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

html, body {
  width: 100%;
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
  overflow: hidden;
}

.view-container {
  width: 100vw;
  height: 100vh;
  display: flex;
}

/* Pre-Join / Connect View */
#join-view {
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background: radial-gradient(circle at center, #1e293b 0%, #0b0f19 100%);
}

.join-card {
  width: 100%;
  max-width: 440px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2.5rem 2rem;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
  text-align: center;
}

.brand-header {
  text-align: center;
  margin-bottom: 1.5rem;
}

.brand-icon {
  font-size: 3rem;
  margin-bottom: 0.75rem;
}

.brand-header h1 {
  font-size: 1.7rem;
  font-weight: 700;
  color: #ffffff;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 0.5rem;
  line-height: 1.5;
}

.spinner {
  width: 38px;
  height: 38px;
  margin: 1.5rem auto 0.5rem;
  border: 3px solid rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  border-top-color: var(--accent);
  animation: spin 0.9s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.alert {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  margin-top: 1.25rem;
  text-align: left;
}

.alert-error {
  background-color: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-primary {
  background-color: var(--accent);
  color: white;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
}

.btn-block {
  width: 100%;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Active Meeting Room View */
#room-view {
  flex-direction: column;
  position: relative;
  background-color: var(--bg-dark);
}

.room-header {
  height: 60px;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  z-index: 10;
}

.room-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.room-info h2 {
  font-size: 1.15rem;
  font-weight: 600;
}

.status-pill {
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: 9999px;
  font-weight: 500;
}

.status-connected {
  background-color: rgba(16, 185, 129, 0.2);
  color: #34d399;
}

.status-connecting {
  background-color: rgba(245, 158, 11, 0.2);
  color: #fbbf24;
}

.status-disconnected {
  background-color: rgba(239, 68, 68, 0.2);
  color: #f87171;
}

.badge {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Video Grid */
.grid-container {
  flex: 1;
  padding: 1rem;
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-grid {
  width: 100%;
  height: 100%;
  max-width: 1400px;
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  align-content: center;
  justify-content: center;
}

.video-grid[data-count="1"] {
  grid-template-columns: minmax(320px, 900px);
}

.participant-tile {
  position: relative;
  background-color: var(--bg-card);
  border-radius: 12px;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid transparent;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.participant-tile.speaking {
  border-color: var(--success);
  box-shadow: 0 0 15px rgba(16, 185, 129, 0.4);
}

.participant-tile video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  background-color: #000;
}

.participant-tile.screen-share video {
  object-fit: contain;
}

.participant-tile.is-local video:not(.is-screenshare) {
  transform: scaleX(-1);
}

.participant-placeholder {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #1e293b;
}

.participant-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  font-weight: 700;
  color: white;
  text-transform: uppercase;
}

.participant-overlay {
  position: absolute;
  bottom: 0.75rem;
  left: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background-color: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(4px);
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  color: #fff;
  z-index: 2;
}

.participant-mic-status.is-muted {
  color: var(--danger);
}

/* Controls Bar */
.controls-bar {
  height: 76px;
  padding: 0 1rem;
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  z-index: 10;
}

.control-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  min-width: 68px;
  height: 52px;
  padding: 0.4rem 0.8rem;
  background-color: var(--bg-control);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.control-btn .icon {
  font-size: 1.25rem;
}

.control-btn .label {
  font-size: 0.7rem;
  font-weight: 500;
  color: #d1d5db;
}

.control-btn:hover {
  background-color: #4b5563;
}

.control-btn.is-disabled {
  background-color: rgba(239, 68, 68, 0.2);
  border-color: rgba(239, 68, 68, 0.4);
  color: #fca5a5;
}

.control-btn.is-disabled .label {
  color: #fca5a5;
}

.control-btn.is-active {
  background-color: rgba(37, 99, 235, 0.3);
  border-color: var(--accent);
}

.control-btn-danger {
  background-color: var(--danger);
}

.control-btn-danger:hover {
  background-color: var(--danger-hover);
}

@media (max-width: 640px) {
  .join-card {
    padding: 1.5rem;
  }
  .video-grid {
    grid-template-columns: 1fr;
  }
  .controls-bar {
    gap: 0.5rem;
  }
  .control-btn {
    min-width: 58px;
    height: 48px;
  }
}