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

:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --danger: #ef4444;
  --success: #22c55e;
  --warning: #f59e0b;
  --bg: #0f172a;
  --bg-card: #1e293b;
  --bg-input: #334155;
  --text: #f1f5f9;
  --text-secondary: #94a3b8;
  --border: #475569;
  --radius: 12px;
}

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

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
}

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

.btn-danger {
  background: var(--danger);
  color: white;
}
.btn-danger:hover { opacity: 0.9; }

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

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  background: var(--bg-input);
  color: var(--text);
}

.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-lg { padding: 14px 28px; font-size: 16px; }

input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-input);
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}
input:focus {
  border-color: var(--primary);
}

/* ============= Login Page ============= */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

.login-box {
  width: 400px;
  padding: 40px;
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: 0 25px 50px -12px rgba(0,0,0,0.5);
}

.login-box h1 {
  text-align: center;
  margin-bottom: 8px;
  font-size: 24px;
}

.login-box p {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 32px;
  font-size: 14px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  color: var(--text-secondary);
}

.login-btn {
  width: 100%;
  padding: 12px;
  margin-top: 8px;
  justify-content: center;
}

.error-msg {
  color: var(--danger);
  font-size: 13px;
  margin-top: 12px;
  text-align: center;
  display: none;
}

/* ============= Dashboard ============= */
.dashboard-page {
  display: flex;
  height: 100vh;
}

.sidebar {
  width: 260px;
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--border);
}

.sidebar-header h2 {
  font-size: 16px;
  margin-bottom: 4px;
}

.sidebar-header .user-info {
  font-size: 12px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.role-badge {
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 500;
}

.role-badge.teacher { background: var(--primary); color: white; }
.role-badge.employee { background: var(--warning); color: #1e293b; }

.sidebar-nav {
  flex: 1;
  padding: 12px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 14px;
  transition: all 0.2s;
  margin-bottom: 4px;
}

.nav-item:hover, .nav-item.active {
  background: var(--bg-input);
  color: var(--text);
}

.logout-btn {
  margin: 12px;
  padding: 10px;
  text-align: center;
  color: var(--danger);
  cursor: pointer;
  border-radius: 8px;
  font-size: 14px;
  transition: all 0.2s;
}
.logout-btn:hover {
  background: rgba(239,68,68,0.1);
}

.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.topbar {
  padding: 16px 24px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.topbar h1 {
  font-size: 20px;
}

.content-area {
  flex: 1;
  padding: 24px;
  overflow-y: auto;
}

/* Meeting Cards */
.meeting-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.meeting-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid var(--border);
  transition: all 0.2s;
}

.meeting-card:hover {
  border-color: var(--primary);
}

.meeting-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.meeting-card .meta {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.meeting-card .actions {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

.invite-link {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  padding: 8px 12px;
  background: var(--bg-input);
  border-radius: 6px;
  font-size: 12px;
  color: var(--text-secondary);
  cursor: pointer;
}
.invite-link:hover { color: var(--text); }

/* Create Meeting Form */
.create-form {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--border);
  margin-bottom: 24px;
}

.create-form h3 {
  margin-bottom: 16px;
}

.form-row {
  display: flex;
  gap: 12px;
  align-items: flex-end;
}

.form-row input {
  flex: 1;
}

/* ============= Room Page ============= */
.room-page {
  display: flex;
  flex-direction: column;
  height: 100vh;
  background: #0a0f1e;
}

.room-topbar {
  padding: 12px 20px;
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

.room-topbar .room-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.room-topbar .room-info h2 {
  font-size: 16px;
}

.room-topbar .participant-count {
  font-size: 13px;
  color: var(--text-secondary);
}

.room-topbar .controls {
  display: flex;
  gap: 8px;
  align-items: center;
}

.room-main {
  flex: 1;
  display: flex;
  position: relative;
  overflow: hidden;
}

.video-grid {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 8px;
  padding: 8px;
  overflow-y: auto;
  align-content: start;
}

.video-container {
  position: relative;
  background: #1a1f2e;
  border-radius: 8px;
  overflow: hidden;
  aspect-ratio: 16/9;
  min-height: 200px;
}

.video-container video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #1a1f2e;
}

.video-container .label {
  position: absolute;
  bottom: 8px;
  left: 8px;
  padding: 4px 10px;
  background: rgba(0,0,0,0.7);
  border-radius: 6px;
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.video-container .label .badge {
  font-size: 10px;
  padding: 1px 5px;
  border-radius: 4px;
  background: var(--primary);
}

.video-container .label .badge.screen {
  background: var(--success);
}

.video-container .watermark {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(-30deg);
  font-size: 24px;
  color: rgba(255,255,255,0.08);
  pointer-events: none;
  white-space: nowrap;
  user-select: none;
  -webkit-user-select: none;
  z-index: 5;
  font-weight: bold;
  letter-spacing: 4px;
}

.screen-share-container {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: #0a0f1e;
  z-index: 20;
  display: none;
}

.screen-share-container.active {
  display: block;
}

.screen-share-container video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.screen-share-container .close-screen-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 25;
}

/* Recording indicator */
.recording-indicator {
  display: none;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: rgba(239,68,68,0.2);
  border-radius: 20px;
  font-size: 12px;
  color: var(--danger);
}

.recording-indicator.active {
  display: inline-flex;
}

.recording-dot {
  width: 8px;
  height: 8px;
  background: var(--danger);
  border-radius: 50%;
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* Bottom bar */
.room-bottombar {
  padding: 12px 20px;
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  border-top: 1px solid var(--border);
}

.room-bottombar .media-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  background: var(--bg-input);
  color: var(--text);
}

.room-bottombar .media-btn:hover {
  background: var(--border);
}

.room-bottombar .media-btn.muted {
  background: var(--danger);
  color: white;
}

.room-bottombar .media-btn.leave-btn {
  background: var(--danger);
  color: white;
  width: 52px;
  height: 52px;
  font-size: 16px;
}

/* Watermark overlay over entire page */
.anti-capture-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  z-index: 99999;
  overflow: hidden;
}

.anti-capture-overlay .wm-line {
  position: absolute;
  color: rgba(255,255,255,0.03);
  font-size: 14px;
  white-space: nowrap;
  user-select: none;
  -webkit-user-select: none;
  transform: rotate(-25deg);
  pointer-events: none;
}

/* ============= Responsive ============= */
@media (max-width: 768px) {
  .sidebar { width: 200px; }
  .video-grid {
    grid-template-columns: 1fr;
  }
  .login-box { width: 90%; padding: 24px; }
}