/* ============================================
   EduTok - TikTok-Style Agricultural Platform
   Beautiful, Modern, Mobile-First Design
   ============================================ */

:root {
  --primary: #00C853;
  --primary-dark: #009624;
  --primary-light: #69F0AE;
  --secondary: #FF6D00;
  --accent: #00BCD4;
  --dark: #0A0A0A;
  --dark-2: #141414;
  --dark-3: #1E1E1E;
  --dark-4: #2A2A2A;
  --text-primary: #FFFFFF;
  --text-secondary: #AAAAAA;
  --text-muted: #666666;
  --border: rgba(255,255,255,0.1);
  --glass: rgba(255,255,255,0.05);
  --glass-border: rgba(255,255,255,0.1);
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --radius: 16px;
  --radius-sm: 8px;
  --radius-lg: 24px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --nav-height: 64px;
  --bottom-nav-height: 70px;
  --category-height: 56px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--dark);
  color: var(--text-primary);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ============================================
   SPLASH SCREEN
   ============================================ */
#splash-screen {
  position: fixed;
  inset: 0;
  background: linear-gradient(135deg, #0A0A0A 0%, #1a2a1a 50%, #0A0A0A 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

#splash-screen.hidden { opacity: 0; visibility: hidden; pointer-events: none; }

.splash-content { text-align: center; }

.splash-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 16px;
  animation: splashPulse 1.5s ease-in-out infinite;
}

.splash-logo .logo-icon { font-size: 64px; }
.splash-logo .logo-text {
  font-size: 48px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.splash-tagline { color: var(--text-secondary); font-size: 18px; margin-bottom: 40px; }

.splash-loader {
  width: 200px;
  height: 4px;
  background: var(--dark-4);
  border-radius: 2px;
  margin: 0 auto;
  overflow: hidden;
}

.loader-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  border-radius: 2px;
  animation: loadBar 2s ease-in-out forwards;
}

@keyframes loadBar { from { width: 0; } to { width: 100%; } }
@keyframes splashPulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.05); } }

/* ============================================
   TOP NAVIGATION
   ============================================ */
.top-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(10,10,10,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 12px;
  z-index: 100;
}

.nav-left { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.nav-center { flex: 1; max-width: 500px; }
.nav-right { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.logo .logo-icon { font-size: 24px; }
.logo .logo-text {
  font-size: 20px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-btn {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: var(--transition);
}

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

.search-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--dark-3);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 8px 16px;
  transition: var(--transition);
}

.search-bar:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0,200,83,0.15);
}

.search-bar i { color: var(--text-muted); font-size: 14px; }
.search-bar input {
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 14px;
  width: 100%;
  font-family: var(--font);
}

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

.btn-login {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border: none;
  color: white;
  padding: 8px 20px;
  border-radius: 24px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font);
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-login:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(0,200,83,0.4); }

/* ============================================
   CATEGORY BAR
   ============================================ */
.category-bar {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  height: var(--category-height);
  background: rgba(10,10,10,0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
  overflow-x: auto;
  scrollbar-width: none;
  z-index: 99;
}

.category-bar::-webkit-scrollbar { display: none; }

.category-btn {
  background: var(--dark-3);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 6px 16px;
  border-radius: 24px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  font-family: var(--font);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
  flex-shrink: 0;
}

.category-btn:hover, .category-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

/* ============================================
   MAIN CONTENT
   ============================================ */
.app { min-height: 100vh; }

.main-content {
  padding-top: calc(var(--nav-height) + var(--category-height));
  padding-bottom: var(--bottom-nav-height);
  min-height: 100vh;
}

.view { display: none; }
.view.active { display: block; }

/* ============================================
   VIDEO FEED (TikTok Style)
   ============================================ */
.video-feed {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.video-card {
  position: relative;
  background: var(--dark-2);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  animation: fadeInUp 0.4s ease;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.video-container {
  position: relative;
  width: 100%;
  background: #000;
  cursor: pointer;
}

/* YouTube embed container - 16:9 aspect ratio */
.youtube-embed {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
}

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

/* Thumbnail overlay */
.video-thumbnail {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  overflow: hidden;
  cursor: pointer;
}

.video-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.video-thumbnail:hover img { transform: scale(1.03); }

.thumbnail-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 40%, rgba(0,0,0,0.8) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.play-btn-large {
  width: 72px;
  height: 72px;
  background: rgba(255,255,255,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: var(--dark);
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
}

.play-btn-large:hover { transform: scale(1.1); background: white; }

.video-duration {
  position: absolute;
  bottom: 12px;
  right: 12px;
  background: rgba(0,0,0,0.8);
  color: white;
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
}

.video-language-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(0,200,83,0.9);
  color: white;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
}

/* Video Info */
.video-info {
  padding: 16px;
  display: flex;
  gap: 12px;
}

.video-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

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

.video-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.video-subject {
  background: rgba(0,200,83,0.15);
  color: var(--primary);
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
}

.video-difficulty {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}

.video-stats {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 16px 16px;
}

.stat-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-family: var(--font);
  transition: var(--transition);
  padding: 6px 0;
}

.stat-btn:hover { color: var(--primary); }
.stat-btn.liked { color: #FF4081; }
.stat-btn.liked i { animation: heartBeat 0.3s ease; }

@keyframes heartBeat {
  0% { transform: scale(1); }
  50% { transform: scale(1.3); }
  100% { transform: scale(1); }
}

.stat-btn i { font-size: 18px; }

.quiz-btn {
  margin-left: auto;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border: none;
  color: white;
  padding: 8px 16px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.quiz-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(0,200,83,0.4); }

/* Video Player (when playing) */
.video-player-container {
  position: relative;
  width: 100%;
  background: #000;
}

/* ============================================
   EXPLORE VIEW
   ============================================ */
.explore-header {
  padding: 24px 16px 16px;
  border-bottom: 1px solid var(--border);
}

.explore-header h2 { font-size: 24px; font-weight: 700; margin-bottom: 4px; }
.explore-header p { color: var(--text-secondary); font-size: 14px; }

.explore-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  padding: 16px;
}

.explore-card {
  background: var(--dark-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition);
}

.explore-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: 0 8px 24px rgba(0,200,83,0.2);
}

.explore-card-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}

.explore-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.explore-card:hover .explore-card-thumb img { transform: scale(1.05); }

.explore-card-info { padding: 12px; }
.explore-card-title {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.4;
}

.explore-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ============================================
   BOTTOM NAVIGATION
   ============================================ */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--bottom-nav-height);
  background: rgba(10,10,10,0.98);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 0 8px;
  z-index: 100;
}

.bottom-nav-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  font-family: var(--font);
  flex: 1;
}

.bottom-nav-btn i { font-size: 20px; }
.bottom-nav-btn span { font-size: 10px; font-weight: 500; }

.bottom-nav-btn.active, .bottom-nav-btn:hover {
  color: var(--primary);
}

.bottom-nav-btn#nav-premium { color: #FFD700; }
.bottom-nav-btn#nav-premium:hover { color: #FFA000; }

/* ============================================
   SIDEBAR
   ============================================ */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 280px;
  background: var(--dark-2);
  border-right: 1px solid var(--border);
  z-index: 200;
  transform: translateX(-100%);
  transition: transform 0.3s ease;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.sidebar:not(.hidden) { transform: translateX(0); }

.sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  z-index: 199;
  backdrop-filter: blur(4px);
}

.sidebar-overlay.hidden { display: none; }

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 16px;
  border-bottom: 1px solid var(--border);
}

.sidebar-header button {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 18px;
}

.sidebar-nav { padding: 16px 0; }

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: var(--transition);
}

.sidebar-link:hover, .sidebar-link.active {
  color: var(--primary);
  background: rgba(0,200,83,0.1);
}

.sidebar-link i { width: 20px; text-align: center; }

.sidebar-subjects { padding: 16px; border-top: 1px solid var(--border); }
.sidebar-subjects h4 { color: var(--text-muted); font-size: 12px; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 12px; }

.subject-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--dark-3);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
  cursor: pointer;
  margin: 4px;
  transition: var(--transition);
}

.subject-chip:hover { background: var(--primary); border-color: var(--primary); color: white; }

/* ============================================
   MODALS
   ============================================ */
.modal {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal.hidden { display: none; }

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.85);
  backdrop-filter: blur(8px);
}

.modal-content {
  position: relative;
  background: var(--dark-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  animation: modalIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.9) translateY(20px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: var(--dark-4);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: var(--transition);
  z-index: 1;
}

.modal-close:hover { background: #FF4444; color: white; border-color: #FF4444; }

/* ============================================
   AUTH MODAL
   ============================================ */
.auth-modal-content { padding: 32px; }

.auth-header { text-align: center; margin-bottom: 28px; }
.auth-logo { font-size: 28px; font-weight: 800; margin-bottom: 8px; }
.auth-header h2 { font-size: 24px; font-weight: 700; margin-bottom: 4px; }
.auth-header p { color: var(--text-secondary); font-size: 14px; }

.auth-form.hidden { display: none; }

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

.form-group label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-group input {
  width: 100%;
  background: var(--dark-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  color: var(--text-primary);
  font-size: 15px;
  font-family: var(--font);
  transition: var(--transition);
  outline: none;
}

.form-group input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0,200,83,0.15);
}

.password-input { position: relative; }
.password-input input { padding-right: 48px; }
.password-input button {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 16px;
}

.error-msg {
  background: rgba(255,68,68,0.1);
  border: 1px solid rgba(255,68,68,0.3);
  color: #FF6B6B;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  margin-bottom: 16px;
}

.error-msg.hidden { display: none; }

.auth-divider {
  text-align: center;
  margin: 20px 0;
  position: relative;
}

.auth-divider::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--border);
}

.auth-divider span {
  background: var(--dark-2);
  padding: 0 12px;
  color: var(--text-muted);
  font-size: 13px;
  position: relative;
}

.auth-switch { text-align: center; font-size: 14px; color: var(--text-secondary); }
.auth-switch a { color: var(--primary); text-decoration: none; font-weight: 600; }
.auth-switch a:hover { text-decoration: underline; }

/* ============================================
   BUTTONS
   ============================================ */
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border: none;
  color: white;
  padding: 12px 24px;
  border-radius: 12px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  font-family: var(--font);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: var(--transition);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,200,83,0.4);
}

.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

.btn-secondary {
  background: var(--dark-3);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 12px 24px;
  border-radius: 12px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  font-family: var(--font);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: var(--transition);
}

.btn-secondary:hover { background: var(--dark-4); border-color: var(--primary); }

.btn-full { width: 100%; }

/* ============================================
   PAYMENT MODAL
   ============================================ */
.payment-modal-content { padding: 32px; max-width: 520px; }

.payment-header { text-align: center; margin-bottom: 24px; }
.payment-header h2 { font-size: 22px; font-weight: 700; margin-bottom: 4px; }
.payment-header h2 i { color: #FFD700; margin-right: 8px; }
.payment-header p { color: var(--text-secondary); font-size: 14px; }

.payment-plans { display: flex; flex-direction: column; gap: 12px; }

.plan-card {
  background: var(--dark-3);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.plan-card:hover, .plan-card.selected {
  border-color: var(--primary);
  background: rgba(0,200,83,0.05);
}

.plan-card.popular::before {
  content: 'Populaire';
  position: absolute;
  top: -10px;
  right: 16px;
  background: linear-gradient(135deg, var(--secondary), #FF8F00);
  color: white;
  padding: 2px 12px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 700;
}

.plan-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.plan-name { font-size: 16px; font-weight: 700; }
.plan-price { text-align: right; }
.plan-price .price-xof { font-size: 20px; font-weight: 800; color: var(--primary); }
.plan-price .price-usd { font-size: 12px; color: var(--text-muted); }
.plan-features { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.plan-feature {
  font-size: 12px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 4px;
}
.plan-feature i { color: var(--primary); font-size: 10px; }

.payment-methods { margin-top: 20px; }
.payment-methods h3 { font-size: 16px; font-weight: 600; margin-bottom: 16px; }

.payment-method-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 20px;
}

.payment-method-btn {
  background: var(--dark-3);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 12px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
  font-family: var(--font);
  color: var(--text-primary);
}

.payment-method-btn:hover, .payment-method-btn.selected {
  border-color: var(--primary);
  background: rgba(0,200,83,0.05);
}

.payment-method-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 800;
}

.mtn-icon { background: #FFCC00; color: #000; font-size: 14px; }
.moov-icon { background: #0066CC; color: white; font-size: 14px; }
.paypal-icon { background: #003087; color: #009CDE; font-size: 22px; }
.card-icon { background: linear-gradient(135deg, #667eea, #764ba2); color: white; font-size: 20px; }

.payment-method-btn span { font-size: 12px; font-weight: 600; text-align: center; }

.payment-processing { text-align: center; padding: 20px 0; }
.processing-animation { display: flex; flex-direction: column; align-items: center; gap: 16px; }
.processing-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(0,200,83,0.4); }
  50% { transform: scale(1.05); box-shadow: 0 0 0 20px rgba(0,200,83,0); }
}

.processing-steps { text-align: left; width: 100%; }
.processing-step {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 0;
  font-size: 14px;
  color: var(--text-secondary);
}
.processing-step.done { color: var(--primary); }
.processing-step i { width: 20px; text-align: center; }

.payment-success { text-align: center; padding: 20px 0; }
.success-animation { display: flex; flex-direction: column; align-items: center; gap: 16px; }
.success-icon {
  font-size: 72px;
  color: var(--primary);
  animation: successBounce 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes successBounce {
  from { transform: scale(0); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

/* ============================================
   QUIZ MODAL
   ============================================ */
.quiz-modal-content { padding: 24px; max-width: 600px; }

.quiz-loading { text-align: center; padding: 40px 20px; }
.ai-loading { display: flex; flex-direction: column; align-items: center; gap: 16px; }
.ai-brain { font-size: 64px; animation: brainPulse 1s ease-in-out infinite; }

@keyframes brainPulse {
  0%, 100% { transform: scale(1) rotate(0deg); }
  50% { transform: scale(1.1) rotate(5deg); }
}

.ai-dots { display: flex; gap: 8px; }
.ai-dots span {
  width: 10px;
  height: 10px;
  background: var(--primary);
  border-radius: 50%;
  animation: dotBounce 1.4s ease-in-out infinite;
}
.ai-dots span:nth-child(2) { animation-delay: 0.2s; }
.ai-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes dotBounce {
  0%, 80%, 100% { transform: scale(0.8); opacity: 0.5; }
  40% { transform: scale(1.2); opacity: 1; }
}

.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 8px;
}

.quiz-header h2 { font-size: 18px; font-weight: 700; flex: 1; }
.quiz-progress { font-size: 14px; color: var(--text-secondary); font-weight: 600; }
.quiz-timer {
  background: var(--dark-3);
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}

.quiz-progress-bar {
  height: 4px;
  background: var(--dark-4);
  border-radius: 2px;
  margin-bottom: 24px;
  overflow: hidden;
}

.quiz-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  border-radius: 2px;
  transition: width 0.3s ease;
}

.question-container { margin-bottom: 24px; }
.question-text {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.options-grid { display: flex; flex-direction: column; gap: 10px; }

.option-btn {
  background: var(--dark-3);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  cursor: pointer;
  text-align: left;
  font-size: 14px;
  font-family: var(--font);
  color: var(--text-primary);
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 12px;
}

.option-btn:hover { border-color: var(--primary); background: rgba(0,200,83,0.05); }
.option-btn.selected { border-color: var(--primary); background: rgba(0,200,83,0.1); }
.option-btn.correct { border-color: var(--primary); background: rgba(0,200,83,0.2); }
.option-btn.wrong { border-color: #FF4444; background: rgba(255,68,68,0.1); }

.option-letter {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--dark-4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
}

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

.quiz-navigation {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

/* Quiz Results */
.quiz-results { text-align: center; }
.results-header { margin-bottom: 24px; }

.results-score-circle {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  border: 6px solid var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 28px;
  font-weight: 800;
  background: rgba(0,200,83,0.1);
  animation: scoreReveal 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes scoreReveal {
  from { transform: scale(0); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.results-score-circle.fail { border-color: #FF4444; background: rgba(255,68,68,0.1); }

.results-details { text-align: left; margin-bottom: 20px; }
.result-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  font-size: 14px;
}

.result-item.correct { background: rgba(0,200,83,0.1); }
.result-item.wrong { background: rgba(255,68,68,0.1); }
.result-item i { margin-top: 2px; flex-shrink: 0; }
.result-item.correct i { color: var(--primary); }
.result-item.wrong i { color: #FF4444; }

.ai-feedback {
  background: rgba(0,188,212,0.1);
  border: 1px solid rgba(0,188,212,0.3);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 20px;
  text-align: left;
}

.ai-feedback h4 { color: var(--accent); margin-bottom: 8px; font-size: 14px; }
.ai-feedback p { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }

.results-actions { display: flex; gap: 12px; justify-content: center; }

/* ============================================
   AI TUTOR MODAL
   ============================================ */
.tutor-modal-content { padding: 0; max-width: 520px; display: flex; flex-direction: column; height: 80vh; }

.tutor-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.tutor-avatar {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, var(--accent), #0097A7);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
}

.tutor-header h2 { font-size: 18px; font-weight: 700; margin-bottom: 2px; }
.tutor-header p { font-size: 13px; color: var(--text-secondary); }

.tutor-chat {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.chat-message { display: flex; gap: 10px; align-items: flex-start; }
.chat-message.user-message { flex-direction: row-reverse; }

.message-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--dark-4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.user-message .message-avatar {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  font-size: 14px;
  font-weight: 700;
}

.message-content {
  background: var(--dark-3);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 12px 16px;
  max-width: 80%;
  font-size: 14px;
  line-height: 1.6;
}

.user-message .message-content {
  background: rgba(0,200,83,0.15);
  border-color: rgba(0,200,83,0.3);
}

.message-content.loading { display: flex; gap: 6px; align-items: center; }
.message-content.loading span {
  width: 8px;
  height: 8px;
  background: var(--text-muted);
  border-radius: 50%;
  animation: dotBounce 1.4s ease-in-out infinite;
}

.tutor-input {
  display: flex;
  gap: 10px;
  padding: 16px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.tutor-input input {
  flex: 1;
  background: var(--dark-3);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 12px 16px;
  color: var(--text-primary);
  font-size: 14px;
  font-family: var(--font);
  outline: none;
  transition: var(--transition);
}

.tutor-input input:focus { border-color: var(--primary); }
.tutor-input .btn-primary { border-radius: 50%; width: 44px; height: 44px; padding: 0; flex-shrink: 0; }

/* ============================================
   USER MENU
   ============================================ */
.user-avatar-menu { position: relative; cursor: pointer; }

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  color: white;
  border: 2px solid var(--primary);
}

.user-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--dark-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  min-width: 220px;
  box-shadow: var(--shadow);
  overflow: hidden;
  animation: dropdownIn 0.2s ease;
}

@keyframes dropdownIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.user-dropdown.hidden { display: none; }

.dropdown-header {
  padding: 16px;
  border-bottom: 1px solid var(--border);
  background: var(--dark-3);
}

.dropdown-header span { display: block; }
.dropdown-header span:first-child { font-weight: 700; font-size: 15px; }
.dropdown-email { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

.user-dropdown a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: var(--transition);
}

.user-dropdown a:hover { background: var(--dark-3); color: var(--text-primary); }
.user-dropdown a i { width: 16px; text-align: center; }
.logout-link { color: #FF6B6B !important; }
.logout-link:hover { background: rgba(255,68,68,0.1) !important; }

/* ============================================
   PROGRESS VIEW
   ============================================ */
.progress-header { padding: 24px 16px 16px; border-bottom: 1px solid var(--border); }
.progress-header h2 { font-size: 24px; font-weight: 700; }

.progress-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  padding: 16px;
}

.stat-card {
  background: var(--dark-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}

.stat-card .stat-icon { font-size: 32px; margin-bottom: 8px; }
.stat-card .stat-value { font-size: 28px; font-weight: 800; color: var(--primary); }
.stat-card .stat-label { font-size: 13px; color: var(--text-secondary); margin-top: 4px; }

/* ============================================
   LOADING STATES
   ============================================ */
.loading-spinner {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
  color: var(--text-muted);
  font-size: 24px;
}

.loading-spinner-large {
  font-size: 48px;
  color: var(--primary);
  margin-bottom: 16px;
}

.feed-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 20px;
  color: var(--text-secondary);
}

.btn-load-more {
  background: var(--dark-3);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 12px 32px;
  border-radius: 24px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font);
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
  margin: 20px auto;
}

.btn-load-more:hover { background: var(--primary); border-color: var(--primary); }

.load-more-container { display: flex; justify-content: center; padding: 20px; }

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */
.toast-container {
  position: fixed;
  bottom: calc(var(--bottom-nav-height) + 16px);
  left: 50%;
  transform: translateX(-50%);
  z-index: 500;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast {
  background: var(--dark-2);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: var(--shadow);
  animation: toastIn 0.3s ease;
  white-space: nowrap;
}

.toast.success { border-color: var(--primary); color: var(--primary); }
.toast.error { border-color: #FF4444; color: #FF6B6B; }
.toast.info { border-color: var(--accent); color: var(--accent); }

@keyframes toastIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (min-width: 768px) {
  .explore-grid { grid-template-columns: repeat(3, 1fr); }
  .progress-stats { grid-template-columns: repeat(4, 1fr); }
  .video-feed { max-width: 680px; margin: 0 auto; }
  .bottom-nav { display: none; }
  .main-content { padding-bottom: 20px; }
}

@media (min-width: 1024px) {
  .explore-grid { grid-template-columns: repeat(4, 1fr); }
  .main-content { padding-left: 0; }
}

@media (max-width: 480px) {
  .nav-center { display: none; }
  .logo .logo-text { display: none; }
  .payment-method-grid { grid-template-columns: 1fr 1fr; }
  .auth-modal-content { padding: 24px 20px; }
}

/* ============================================
   SCROLLBAR
   ============================================ */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--dark-4); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ============================================
   UTILITY CLASSES
   ============================================ */
.hidden { display: none !important; }
.text-primary { color: var(--primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mb-16 { margin-bottom: 16px; }