/* ==============================================================================
   Helen AI Video Conference - Dark Glassmorphism Design
   ============================================================================== */

:root {
  --bg-base: #070b14;
  --bg-surface: #0f172a;
  --bg-surface-elevated: #1e293b;
  --bg-card: rgba(30, 41, 59, 0.7);
  --border: rgba(148, 163, 184, 0.12);
  --border-focus: #38bdf8;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --primary: #38bdf8;
  --primary-hover: #0ea5e9;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --success: #10b981;
  --tutor-gold: #f59e0b;
  --student-teal: #14b8a6;
  --sidebar-w: 360px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

body {
  background-color: var(--bg-base);
  color: var(--text-main);
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* ==============================================================================
   LOBBY SCREEN
   ============================================================================== */
#lobby-screen {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at 50% 30%, #172554 0%, #070b14 70%);
  z-index: 100;
  padding: 1.5rem;
  overflow-y: auto;
}

.lobby-container {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 2rem;
  max-width: 1000px;
  width: 100%;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: 1.5rem;
  padding: 2.5rem;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
}

@media (max-width: 768px) {
  .lobby-container {
    grid-template-columns: 1fr;
    padding: 1.5rem;
  }
}

.preview-box {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.preview-video-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #020617;
  border-radius: 1rem;
  overflow: hidden;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview-video-wrap video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scaleX(-1); /* Mirror local preview */
}

.preview-controls {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.mic-meter-bar {
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
  overflow: hidden;
}

.mic-meter-fill {
  height: 100%;
  width: 0%;
  background: var(--success);
  transition: width 0.05s ease;
}

.lobby-form {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1.25rem;
}

.brand-header h1 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-header p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.form-control {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border);
  color: var(--text-main);
  padding: 0.75rem 1rem;
  border-radius: 0.65rem;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form-control:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
}

.role-selector {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.role-card {
  border: 2px solid var(--border);
  background: var(--bg-surface-elevated);
  border-radius: 0.65rem;
  padding: 0.75rem;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  transition: all 0.15s;
}

.role-card.selected {
  border-color: var(--primary);
  background: rgba(56, 189, 248, 0.1);
}

.role-title {
  font-weight: 700;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.role-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.btn-join {
  background: var(--primary);
  color: #030712;
  font-weight: 700;
  font-size: 1rem;
  padding: 0.9rem;
  border-radius: 0.75rem;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: background 0.15s, transform 0.05s;
  margin-top: 0.5rem;
}

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

.btn-join:active {
  transform: scale(0.99);
}

/* ==============================================================================
   CALL SCREEN
   ============================================================================== */
#call-screen {
  flex: 1;
  display: none;
  flex-direction: column;
  position: relative;
  height: 100vh;
}

/* Top App Bar */
.top-bar {
  height: 60px;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  z-index: 10;
}

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

.room-title {
  font-weight: 700;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: 9999px;
  text-transform: uppercase;
}

.badge-tutor {
  background: rgba(245, 158, 11, 0.2);
  color: var(--tutor-gold);
  border: 1px solid rgba(245, 158, 11, 0.4);
}

.badge-student {
  background: rgba(20, 184, 166, 0.2);
  color: var(--student-teal);
  border: 1px solid rgba(20, 184, 166, 0.4);
}

.live-indicator {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: #ef4444;
  font-weight: 600;
}

.live-dot {
  width: 8px;
  height: 8px;
  background: #ef4444;
  border-radius: 50%;
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.4); opacity: 0.4; }
  100% { transform: scale(1); opacity: 1; }
}

/* Call Body (Video Grid + Sidebar) */
.call-body {
  flex: 1;
  display: flex;
  position: relative;
  overflow: hidden;
}

.stage-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 1rem;
  overflow-y: auto;
  position: relative;
}

/* Dynamic Grid */
.video-grid {
  display: grid;
  gap: 1rem;
  width: 100%;
  height: 100%;
  align-content: center;
  justify-content: center;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
}

.video-grid.single-user {
  grid-template-columns: 1fr;
  max-width: 900px;
  margin: 0 auto;
}

.video-grid.two-users {
  grid-template-columns: repeat(2, 1fr);
}

.video-grid.many-users {
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

/* Video Tile */
.video-tile {
  position: relative;
  background: #020617;
  border-radius: 1rem;
  overflow: hidden;
  border: 2px solid transparent;
  transition: border-color 0.2s, transform 0.2s;
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-tile.speaking {
  border-color: var(--primary);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.4);
}

.video-tile.screenshare {
  grid-column: 1 / -1;
  max-height: 70vh;
}

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

.video-tile video.mirror {
  transform: scaleX(-1);
}

.tile-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, #38bdf8, #6366f1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 700;
  color: white;
}

.tile-overlay-bottom {
  position: absolute;
  bottom: 0.75rem;
  left: 0.75rem;
  right: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  pointer-events: none;
}

.participant-label {
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(8px);
  padding: 0.35rem 0.75rem;
  border-radius: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  border: 1px solid var(--border);
}

.mic-status-icon {
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(8px);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
}

.mic-status-icon.muted {
  background: rgba(239, 68, 68, 0.85);
  color: white;
}

/* Sidebar (Chat / Participants) */
.sidebar {
  width: var(--sidebar-w);
  background: var(--bg-surface);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.25s ease-in-out;
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  z-index: 20;
}

.sidebar.open {
  transform: translateX(0);
}

.sidebar-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sidebar-tabs {
  display: flex;
  gap: 0.5rem;
}

.sidebar-tab {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.4rem 0.75rem;
  border-radius: 0.5rem;
  cursor: pointer;
}

.sidebar-tab.active {
  color: var(--primary);
  background: var(--bg-surface-elevated);
}

.sidebar-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 0.35rem;
}

.sidebar-close:hover {
  color: var(--text-main);
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* Chat Messages */
.chat-msg {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  font-size: 0.875rem;
}

.chat-msg-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.chat-msg-sender {
  font-weight: 700;
  color: var(--text-main);
}

.chat-msg-body {
  background: var(--bg-surface-elevated);
  padding: 0.6rem 0.85rem;
  border-radius: 0.65rem;
  color: #e2e8f0;
  line-height: 1.4;
  word-break: break-word;
}

.chat-msg.self .chat-msg-body {
  background: rgba(56, 189, 248, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.chat-input-row {
  padding: 0.75rem;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 0.5rem;
}

.chat-input-row input {
  flex: 1;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.6rem 0.85rem;
  color: white;
  outline: none;
  font-size: 0.9rem;
}

.chat-input-row button {
  background: var(--primary);
  border: none;
  border-radius: 0.5rem;
  padding: 0.6rem 1rem;
  cursor: pointer;
  font-weight: 600;
  color: #020617;
}

/* Participants List in Sidebar */
.participant-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0.75rem;
  background: var(--bg-surface-elevated);
  border-radius: 0.5rem;
  border: 1px solid var(--border);
}

.p-info {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9rem;
  font-weight: 600;
}

/* Bottom Controls Dock */
.bottom-dock {
  height: 80px;
  background: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(16px);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0 1.5rem;
  z-index: 10;
}

.dock-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-surface-elevated);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
  position: relative;
}

.dock-btn:hover {
  background: #334155;
  transform: translateY(-2px);
}

.dock-btn.active {
  background: rgba(56, 189, 248, 0.2);
  color: var(--primary);
  border-color: var(--primary);
}

.dock-btn.danger {
  background: var(--danger);
  border-color: var(--danger);
  color: white;
}

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

.dock-btn.muted {
  background: rgba(239, 68, 68, 0.2);
  color: var(--danger);
  border-color: rgba(239, 68, 68, 0.5);
}

.badge-count {
  position: absolute;
  top: -4px;
  right: -4px;
  background: var(--primary);
  color: #020617;
  font-size: 0.7rem;
  font-weight: 700;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 1000;
  pointer-events: none;
}

.toast {
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(12px);
  color: white;
  border: 1px solid var(--border);
  padding: 0.65rem 1.25rem;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 600;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  animation: toastIn 0.25s ease-out;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}