/* DJ PIARNU - Main Styles */
/* Educational DJ Platform for Primary School */

@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;500;600;700;800;900&family=Poppins:wght@300;400;500;600;700&display=swap');

:root {
  /* Color Palette - DJ Theme */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a2e;
  --bg-card-hover: #22223a;
  
  --accent-purple: #8b5cf6;
  --accent-cyan: #06b6d4;
  --accent-pink: #f472b6;
  --accent-blue: #3b82f6;
  
  --success: #22c55e;
  --warning: #f59e0b;
  --error: #ef4444;
  
  --text-primary: #ffffff;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  /* Gradients */
  --gradient-purple: linear-gradient(135deg, #8b5cf6 0%, #6366f1 100%);
  --gradient-cyan: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
  --gradient-pink: linear-gradient(135deg, #f472b6 0%, #ec4899 100%);
  --gradient-dark: linear-gradient(180deg, #1a1a2e 0%, #12121a 100%);
  
  /* Shadows */
  --shadow-glow-purple: 0 0 20px rgba(139, 92, 246, 0.4);
  --shadow-glow-cyan: 0 0 20px rgba(6, 182, 212, 0.4);
  --shadow-glow-pink: 0 0 20px rgba(244, 114, 182, 0.4);
  
  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 50%;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Poppins', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

/* Background Effect */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(ellipse at 20% 20%, rgba(139, 92, 246, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(6, 182, 212, 0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(244, 114, 182, 0.05) 0%, transparent 70%);
  pointer-events: none;
  z-index: -1;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Orbitron', sans-serif;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.5px;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; }

p { margin-bottom: var(--space-md); }

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: var(--transition-fast);
}

a:hover {
  color: var(--accent-purple);
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--accent-purple);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-cyan);
}

/* Layout */
.app-container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar Navigation */
.sidebar {
  width: 280px;
  background: var(--bg-secondary);
  border-right: 1px solid rgba(139, 92, 246, 0.2);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  position: fixed;
  height: 100vh;
  left: 0;
  top: 0;
  z-index: 100;
  transition: transform var(--transition-normal);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid rgba(139, 92, 246, 0.2);
}

.logo-icon {
  width: 50px;
  height: 50px;
  background: var(--gradient-purple);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  animation: pulse-glow 2s infinite;
}

.logo-text {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.25rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  list-style: none;
  flex: 1;
}

.nav-item {
  margin-bottom: var(--space-sm);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-weight: 500;
  transition: var(--transition-normal);
  cursor: pointer;
}

.nav-link:hover {
  background: rgba(139, 92, 246, 0.1);
  color: var(--text-primary);
}

.nav-link.active {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(6, 182, 212, 0.1));
  color: var(--text-primary);
  border: 1px solid rgba(139, 92, 246, 0.3);
  box-shadow: var(--shadow-glow-purple);
}

.nav-icon {
  font-size: 1.25rem;
  width: 24px;
  text-align: center;
}

.nav-badge {
  margin-left: auto;
  background: var(--accent-pink);
  color: white;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

/* User Info in Sidebar */
.sidebar-user {
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(139, 92, 246, 0.2);
  margin-top: auto;
}

.user-info {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: rgba(139, 92, 246, 0.1);
  border-radius: var(--radius-md);
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--gradient-purple);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.user-details {
  flex: 1;
  min-width: 0;
}

.user-name {
  font-weight: 600;
  font-size: 0.875rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-points {
  font-size: 0.75rem;
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

/* Main Content */
.main-content {
  flex: 1;
  margin-left: 280px;
  padding: var(--space-2xl);
  min-height: 100vh;
}

/* Page Header */
.page-header {
  margin-bottom: var(--space-2xl);
}

.page-title {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
}

.page-subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* Announcement Bar */
.announcement-bar {
  background: linear-gradient(90deg, var(--accent-purple), var(--accent-pink));
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-xl);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  animation: slide-in 0.5s ease;
}

.announcement-icon {
  font-size: 1.5rem;
}

.announcement-text {
  flex: 1;
  font-weight: 500;
}

/* Cards */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  border: 1px solid rgba(139, 92, 246, 0.2);
  transition: var(--transition-normal);
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(139, 92, 246, 0.4);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow-purple);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
}

/* Grid Layouts */
.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
  
  .sidebar {
    transform: translateX(-100%);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .main-content {
    margin-left: 0;
    padding: var(--space-lg);
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  font-family: 'Poppins', sans-serif;
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  border: none;
  transition: var(--transition-normal);
}

.btn-primary {
  background: var(--gradient-purple);
  color: white;
  box-shadow: var(--shadow-glow-purple);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(139, 92, 246, 0.6);
}

.btn-secondary {
  background: transparent;
  color: var(--accent-cyan);
  border: 2px solid var(--accent-cyan);
}

.btn-secondary:hover {
  background: rgba(6, 182, 212, 0.1);
  box-shadow: var(--shadow-glow-cyan);
}

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

.btn-danger:hover {
  background: #dc2626;
}

.btn-small {
  padding: var(--space-sm) var(--space-md);
  font-size: 0.75rem;
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-full);
}

/* Forms */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--space-sm);
  font-weight: 500;
  color: var(--text-secondary);
}

.form-input {
  width: 100%;
  padding: var(--space-md);
  background: var(--bg-secondary);
  border: 2px solid rgba(139, 92, 246, 0.2);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: 'Poppins', sans-serif;
  font-size: 1rem;
  transition: var(--transition-normal);
}

.form-input:focus {
  outline: none;
  border-color: var(--accent-purple);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2);
}

.form-input::placeholder {
  color: var(--text-muted);
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2394a3b8'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 20px;
  padding-right: 40px;
}

/* Tutorial Cards */
.tutorial-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(139, 92, 246, 0.2);
  transition: var(--transition-normal);
  cursor: pointer;
}

.tutorial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow-purple);
  border-color: var(--accent-purple);
}

.tutorial-thumbnail {
  position: relative;
  aspect-ratio: 16/9;
  background: var(--bg-secondary);
  overflow: hidden;
}

.tutorial-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-normal);
}

.tutorial-card:hover .tutorial-thumbnail img {
  transform: scale(1.05);
}

.tutorial-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  background: rgba(139, 92, 246, 0.9);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: white;
  transition: var(--transition-normal);
  opacity: 0;
}

.tutorial-card:hover .tutorial-play-btn {
  opacity: 1;
}

.tutorial-badge {
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
  padding: var(--space-xs) var(--space-md);
  background: rgba(0, 0, 0, 0.7);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.tutorial-badge.iniciacion { background: var(--success); }
.tutorial-badge.basicas { background: var(--accent-cyan); }
.tutorial-badge.intermedias { background: var(--accent-pink); }

.tutorial-watched {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  width: 28px;
  height: 28px;
  background: var(--success);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
}

.tutorial-content {
  padding: var(--space-lg);
}

.tutorial-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  line-height: 1.4;
}

.tutorial-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.tutorial-views {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

/* Chat Interface */
.chat-container {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 200px);
  min-height: 500px;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.chat-message {
  display: flex;
  gap: var(--space-md);
  max-width: 80%;
}

.chat-message.user {
  margin-left: auto;
  flex-direction: row-reverse;
}

.chat-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.chat-avatar.ai {
  background: var(--gradient-purple);
}

.chat-avatar.user {
  background: var(--gradient-cyan);
}

.chat-bubble {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-lg);
  line-height: 1.5;
}

.chat-message.ai .chat-bubble {
  background: var(--bg-card);
  border: 1px solid rgba(139, 92, 246, 0.2);
  border-bottom-left-radius: var(--radius-sm);
}

.chat-message.user .chat-bubble {
  background: var(--gradient-purple);
  border-bottom-right-radius: var(--radius-sm);
}

.chat-input-container {
  padding: var(--space-lg);
  border-top: 1px solid rgba(139, 92, 246, 0.2);
  display: flex;
  gap: var(--space-md);
}

.chat-input {
  flex: 1;
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-secondary);
  border: 2px solid rgba(139, 92, 246, 0.2);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-family: 'Poppins', sans-serif;
  font-size: 1rem;
}

.chat-input:focus {
  outline: none;
  border-color: var(--accent-purple);
}

.suggested-questions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
}

.suggested-btn {
  padding: var(--space-sm) var(--space-md);
  background: rgba(139, 92, 246, 0.1);
  border: 1px solid rgba(139, 92, 246, 0.3);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-size: 0.75rem;
  cursor: pointer;
  transition: var(--transition-normal);
}

.suggested-btn:hover {
  background: rgba(139, 92, 246, 0.2);
  color: var(--text-primary);
}

/* Ranking Table */
.ranking-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0 var(--space-sm);
}

.ranking-table th {
  text-align: left;
  padding: var(--space-md);
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.875rem;
  text-transform: uppercase;
}

.ranking-row {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  transition: var(--transition-normal);
}

.ranking-row:hover {
  background: var(--bg-card-hover);
}

.ranking-row td {
  padding: var(--space-md);
  vertical-align: middle;
}

.ranking-position {
  width: 50px;
  text-align: center;
  font-family: 'Orbitron', sans-serif;
  font-weight: 700;
  font-size: 1.25rem;
}

.ranking-position.gold { color: #ffd700; }
.ranking-position.silver { color: #c0c0c0; }
.ranking-position.bronze { color: #cd7f32; }

.ranking-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--gradient-purple);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-right: var(--space-md);
}

.ranking-name {
  font-weight: 600;
}

.ranking-stats {
  display: flex;
  gap: var(--space-lg);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.ranking-points {
  font-family: 'Orbitron', sans-serif;
  font-weight: 700;
  color: var(--accent-cyan);
}

/* Profile */
.profile-header {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  padding: var(--space-xl);
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-xl);
}

.profile-avatar {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-full);
  background: var(--gradient-purple);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  border: 4px solid var(--accent-purple);
  box-shadow: var(--shadow-glow-purple);
}

.profile-info h2 {
  margin-bottom: var(--space-sm);
}

.profile-email {
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.profile-stats {
  display: flex;
  gap: var(--space-xl);
}

.profile-stat {
  text-align: center;
}

.profile-stat-value {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.profile-stat-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
}

/* Avatar Selection */
.avatar-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--space-md);
}

.avatar-option {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-full);
  background: var(--bg-secondary);
  border: 3px solid transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  cursor: pointer;
  transition: var(--transition-normal);
}

.avatar-option:hover {
  border-color: var(--accent-purple);
  transform: scale(1.1);
}

.avatar-option.selected {
  border-color: var(--accent-cyan);
  box-shadow: var(--shadow-glow-cyan);
}

/* Badges */
.badges-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.badge {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: rgba(139, 92, 246, 0.1);
  border: 1px solid rgba(139, 92, 246, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
}

.badge-icon {
  font-size: 1rem;
}

.badge.locked {
  opacity: 0.5;
  filter: grayscale(1);
}

/* Login Page */
.auth-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
}

.auth-card {
  width: 100%;
  max-width: 420px;
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  border: 1px solid rgba(139, 92, 246, 0.3);
  box-shadow: var(--shadow-glow-purple);
}

.auth-logo {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.auth-logo-icon {
  width: 80px;
  height: 80px;
  background: var(--gradient-purple);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  margin: 0 auto var(--space-md);
  animation: pulse-glow 2s infinite;
}

.auth-title {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.auth-tabs {
  display: flex;
  margin-bottom: var(--space-xl);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-xs);
}

.auth-tab {
  flex: 1;
  padding: var(--space-md);
  text-align: center;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition-normal);
}

.auth-tab.active {
  background: var(--gradient-purple);
  color: white;
}

.auth-form {
  display: none;
}

.auth-form.active {
  display: block;
}

.auth-error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--error);
  color: var(--error);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
  font-size: 0.875rem;
  display: none;
}

.auth-error.show {
  display: block;
}

/* Admin Panel */
.admin-section {
  margin-bottom: var(--space-2xl);
}

.admin-title {
  font-size: 1.25rem;
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
}

.admin-table th,
.admin-table td {
  padding: var(--space-md);
  text-align: left;
  border-bottom: 1px solid rgba(139, 92, 246, 0.2);
}

.admin-table th {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.875rem;
  text-transform: uppercase;
}

.admin-table tr:hover {
  background: rgba(139, 92, 246, 0.05);
}

/* Mobile Navigation */
.mobile-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-secondary);
  border-top: 1px solid rgba(139, 92, 246, 0.2);
  padding: var(--space-md);
  z-index: 100;
}

.mobile-nav-items {
  display: flex;
  justify-content: space-around;
}

.mobile-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  color: var(--text-secondary);
  font-size: 0.75rem;
  cursor: pointer;
  transition: var(--transition-normal);
}

.mobile-nav-item.active {
  color: var(--accent-purple);
}

.mobile-nav-icon {
  font-size: 1.25rem;
}

.mobile-menu-btn {
  display: none;
  position: fixed;
  top: var(--space-lg);
  left: var(--space-lg);
  width: 44px;
  height: 44px;
  background: var(--bg-card);
  border: 1px solid rgba(139, 92, 246, 0.3);
  border-radius: var(--radius-md);
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  cursor: pointer;
  z-index: 101;
}

@media (max-width: 768px) {
  .mobile-nav {
    display: block;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  .sidebar {
    padding-top: 80px;
  }
  
  .profile-header {
    flex-direction: column;
    text-align: center;
  }
  
  .profile-stats {
    justify-content: center;
  }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-secondary); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-error { color: var(--error); }
.text-purple { color: var(--accent-purple); }
.text-cyan { color: var(--accent-cyan); }
.text-pink { color: var(--accent-pink); }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.hidden { display: none !important; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

/* Welcome Section */
.welcome-section {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(6, 182, 212, 0.1));
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  margin-bottom: var(--space-xl);
  border: 1px solid rgba(139, 92, 246, 0.3);
  position: relative;
  overflow: hidden;
}

.welcome-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.3) 0%, transparent 70%);
  animation: float 6s ease-in-out infinite;
}

.welcome-title {
  font-size: 2.5rem;
  margin-bottom: var(--space-md);
  position: relative;
}

.welcome-text {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  position: relative;
}

/* Quick Access Cards */
.quick-access {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.quick-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition-normal);
}

.quick-card:hover {
  border-color: var(--accent-purple);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow-purple);
}

.quick-card-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-lg);
  background: var(--gradient-purple);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
}

.quick-card-title {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
}

.quick-card-desc {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

@media (max-width: 768px) {
  .quick-access {
    grid-template-columns: 1fr;
  }
  
  .welcome-title {
    font-size: 1.75rem;
  }
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--space-2xl);
  color: var(--text-secondary);
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: var(--space-lg);
  opacity: 0.5;
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  max-width: 600px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.9);
  transition: var(--transition-normal);
}

.modal-overlay.active .modal {
  transform: scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.modal-close {
  width: 36px;
  height: 36px;
  background: var(--bg-secondary);
  border: none;
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  transition: var(--transition-normal);
}

.modal-close:hover {
  background: var(--error);
  color: white;
}

/* Video Player Modal */
.video-modal .modal {
  max-width: 900px;
}

.video-container {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: #000;
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* Category Filter */
.category-filter {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.category-btn {
  padding: var(--space-sm) var(--space-lg);
  background: var(--bg-secondary);
  border: 1px solid rgba(139, 92, 246, 0.2);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-normal);
}

.category-btn:hover {
  border-color: var(--accent-purple);
  color: var(--text-primary);
}

.category-btn.active {
  background: var(--gradient-purple);
  border-color: transparent;
  color: white;
}

/* Loading */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(139, 92, 246, 0.2);
  border-top-color: var(--accent-purple);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Notification Toast */
.toast {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  background: var(--bg-card);
  border: 1px solid var(--accent-purple);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  box-shadow: var(--shadow-glow-purple);
  transform: translateY(100px);
  opacity: 0;
  transition: var(--transition-normal);
  z-index: 1001;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast.success { border-color: var(--success); }
.toast.error { border-color: var(--error); }
.toast.warning { border-color: var(--warning); }