/* =============================================================================
   Base Styles
   ============================================================================= */

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

:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --secondary: #6b7280;
  --secondary-hover: #4b5563;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --success: #22c55e;
  --warning: #f59e0b;
  --bg: #0f172a;
  --bg-card: #1e293b;
  --bg-input: #334155;
  --text: #f8fafc;
  --text-muted: #94a3b8;
  --border: #475569;
  --radius: 12px;
  --radius-sm: 8px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

#app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* =============================================================================
   Header
   ============================================================================= */

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}

header h1 {
  font-size: 1.5rem;
  font-weight: 600;
}

.status {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 0.875rem;
  background: var(--bg-card);
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--secondary);
}

.status.connected .status-dot {
  background: var(--success);
}

.status.disconnected .status-dot {
  background: var(--danger);
}

.status.connecting .status-dot {
  background: var(--warning);
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* =============================================================================
   Screens
   ============================================================================= */

.screen {
  display: none;
  flex: 1;
}

.screen.active {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
}

/* =============================================================================
   Cards
   ============================================================================= */

.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 32px;
  width: 100%;
  max-width: 460px;
  text-align: center;
}

.card h2 {
  margin-bottom: 24px;
  font-size: 1.25rem;
}

/* =============================================================================
   Form Elements
   ============================================================================= */

.form-group {
  margin-bottom: 20px;
  text-align: left;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.875rem;
  color: var(--text-muted);
}

input[type="text"] {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s;
}

input[type="text"]:focus {
  border-color: var(--primary);
}

input[type="text"]::placeholder {
  color: var(--text-muted);
}

/* =============================================================================
   Buttons
   ============================================================================= */

.btn {
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

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

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

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

.btn.secondary:hover {
  background: var(--secondary-hover);
}

.btn.large {
  padding: 16px 32px;
  font-size: 1.125rem;
}

.button-group {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.hint {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* =============================================================================
   User List
   ============================================================================= */

.user-list-container {
  margin-bottom: 24px;
  text-align: left;
}

.user-list-container h3 {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  text-align: center;
}

.user-list-container h3 span {
  color: var(--primary);
  font-weight: 600;
}

.user-list {
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  padding: 12px;
  max-height: 200px;
  overflow-y: auto;
  min-height: 60px;
}

.user-list .empty-message {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
  padding: 12px;
}

.user-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  transition: background 0.2s;
}

.user-item:last-child {
  margin-bottom: 0;
}

.user-item:hover {
  background: var(--bg);
}

.user-item.clickable {
  cursor: pointer;
}

.user-item.clickable:hover {
  background: var(--primary);
}

.user-item.self {
  border: 1px solid var(--primary);
}

.user-name {
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
}

.user-badge {
  font-size: 0.75rem;
  padding: 2px 8px;
  background: var(--primary);
  border-radius: 4px;
  color: white;
}

.call-btn {
  padding: 6px 12px;
  background: var(--success);
  border: none;
  border-radius: 4px;
  color: white;
  font-size: 0.75rem;
  cursor: pointer;
  transition: background 0.2s;
}

.call-btn:hover {
  background: #16a34a;
}

.info-text {
  color: var(--text-muted);
  font-size: 0.875rem;
  text-align: center;
  margin: 16px 0;
}

/* =============================================================================
   Video Room
   ============================================================================= */

#video-room {
  padding: 0;
}

#video-room.active {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: 20px;
  gap: 20px;
}

.room-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  gap: 16px;
  flex-wrap: wrap;
}

.room-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
}

.room-header h2 span {
  color: var(--primary);
}

.room-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.room-subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.room-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.invite-link-group {
  display: flex;
  gap: 12px;
  align-items: center;
  min-width: min(100%, 420px);
}

.invite-link-group input {
  min-width: 240px;
}

.media-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 20px;
}

.media-toolbar {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.media-toolbar input {
  flex: 1;
  min-width: 260px;
}

.media-meta-block {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.media-meta-block h3 {
  font-size: 1.05rem;
}

.media-meta-block p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.media-player {
  width: 100%;
  min-height: 240px;
  border-radius: var(--radius-sm);
  background: #000;
}

.video-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  grid-auto-rows: minmax(200px, 1fr);
  overflow-y: auto;
  padding: 8px;
}

/* Responsive grid layouts */
.video-grid[data-count="1"] {
  grid-template-columns: 1fr;
}

.video-grid[data-count="2"] {
  grid-template-columns: repeat(2, 1fr);
}

.video-grid[data-count="3"],
.video-grid[data-count="4"] {
  grid-template-columns: repeat(2, 1fr);
}

.video-grid[data-count="5"],
.video-grid[data-count="6"] {
  grid-template-columns: repeat(3, 1fr);
}

.video-tile {
  position: relative;
  background: #000;
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
}

.video-tile video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-tile .video-label {
  position: absolute;
  bottom: 12px;
  left: 12px;
  background: rgba(0, 0, 0, 0.7);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  z-index: 10;
}

.video-tile.local {
  border: 2px solid var(--primary);
}

.video-tile .connection-indicator {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--success);
  z-index: 10;
}

.video-tile .connection-indicator.connecting {
  background: var(--warning);
  animation: pulse 1s infinite;
}

.video-tile .connection-indicator.disconnected {
  background: var(--danger);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* =============================================================================
   Call Screen
   ============================================================================= */


/* =============================================================================
   Call Controls
   ============================================================================= */

.call-controls {
  display: flex;
  justify-content: center;
  gap: 16px;
  padding: 20px;
  background: var(--bg-card);
  border-radius: var(--radius);
}

.control-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 16px 24px;
  background: var(--bg-input);
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text);
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.control-btn:hover {
  background: var(--secondary);
  transform: translateY(-2px);
}

.control-btn .icon {
  font-size: 1.5rem;
}

.control-btn .label {
  font-size: 0.75rem;
}

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

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

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

/* =============================================================================
   Modal
   ============================================================================= */

.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--bg-card);
  padding: 32px;
  border-radius: var(--radius);
  max-width: 400px;
  text-align: center;
}

@media (max-width: 768px) {
  #app {
    padding: 16px;
  }

  .invite-link-group {
    width: 100%;
    min-width: 0;
    flex-direction: column;
    align-items: stretch;
  }

  .invite-link-group input {
    min-width: 0;
  }

  .room-actions {
    width: 100%;
    justify-content: stretch;
  }

  .room-actions .btn {
    width: 100%;
  }

  .media-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .media-toolbar input {
    min-width: 0;
  }

  .media-player {
    min-height: 200px;
  }
}

.modal-content h3 {
  margin-bottom: 16px;
  color: var(--danger);
}

.modal-content p {
  margin-bottom: 24px;
  color: var(--text-muted);
  white-space: pre-line;
  text-align: left;
}

/* =============================================================================
   Responsive
   ============================================================================= */

@media (max-width: 768px) {
  .video-grid {
    grid-template-columns: 1fr !important;
  }

  .call-controls {
    gap: 8px;
    padding: 16px;
  }

  .control-btn {
    padding: 12px 16px;
  }

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

  .button-group {
    flex-direction: column;
  }

  #video-room.active {
    padding: 10px;
  }
}