/**
 * HAI Tech Academy - Modern Dashboard
 * Course catalog and student dashboard
 */

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a24;
  --bg-hover: #22222e;
  --accent: #6366f1;
  --accent-glow: rgba(99, 102, 241, 0.3);
  --accent-light: #818cf8;
  --success: #10b981;
  --warning: #f59e0b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: rgba(255, 255, 255, 0.08);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Heebo', system-ui, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  direction: rtl;
}

/* ==================== NAVBAR ==================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  background: rgba(10, 10, 15, 0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  z-index: 100;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 16px;
}

.navbar-logo {
  height: 40px;
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.nav-link.active {
  color: var(--accent-light);
  background: rgba(99, 102, 241, 0.1);
}

.nav-link svg {
  width: 20px;
  height: 20px;
}

.navbar-user {
  display: flex;
  align-items: center;
  gap: 16px;
}

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

.user-avatar:hover {
  transform: scale(1.05);
}

/* ==================== MAIN LAYOUT ==================== */
.main-container {
  padding-top: 72px;
  min-height: 100vh;
}

/* ==================== HERO SECTION ==================== */
.hero {
  padding: 48px 32px;
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.hero-content {
  max-width: 1400px;
  margin: 0 auto;
}

.greeting {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 8px;
}

.greeting span {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 16px;
}

/* ==================== STATS ROW ==================== */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-top: 32px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: var(--transition);
}

.stat-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.stat-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.stat-icon svg {
  width: 28px;
  height: 28px;
}

.stat-icon.purple {
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-light);
}

.stat-icon.green {
  background: rgba(16, 185, 129, 0.15);
  color: var(--success);
}

.stat-icon.orange {
  background: rgba(245, 158, 11, 0.15);
  color: var(--warning);
}

.stat-info h3 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 4px;
}

.stat-info p {
  color: var(--text-muted);
  font-size: 14px;
}

/* ==================== CONTENT SECTION ==================== */
.content {
  padding: 32px;
  max-width: 1400px;
  margin: 0 auto;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.section-title {
  font-size: 24px;
  font-weight: 700;
}

.section-tabs {
  display: flex;
  gap: 8px;
}

.tab-btn {
  padding: 8px 20px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn:hover {
  border-color: var(--accent);
  color: var(--accent-light);
}

.tab-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

/* ==================== COURSE GRID ==================== */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

/* ==================== COURSE CARD ==================== */
.course-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
}

.course-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.course-image {
  position: relative;
  height: 180px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  overflow: hidden;
}

.course-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.course-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(10px);
  padding: 6px 12px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
}

.course-badge.in-progress {
  color: var(--warning);
}

.course-badge.completed {
  color: var(--success);
}

.course-badge.new {
  background: var(--accent);
  color: white;
}

.course-progress-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: rgba(0, 0, 0, 0.5);
}

.course-progress-bar .fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  transition: width 0.5s ease;
}

.course-content {
  padding: 24px;
}

.course-category {
  color: var(--accent-light);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.course-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.4;
}

.course-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--text-muted);
  font-size: 13px;
  margin-bottom: 16px;
}

.course-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.course-meta-item svg {
  width: 16px;
  height: 16px;
}

.course-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.course-progress {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
}

.progress-circle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: conic-gradient(var(--accent) var(--progress, 0%), var(--bg-hover) 0%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.progress-circle::before {
  content: '';
  position: absolute;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--bg-card);
}

.progress-circle span {
  position: relative;
  font-size: 10px;
  font-weight: 700;
}

.continue-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.continue-btn:hover {
  background: var(--accent-light);
}

.continue-btn svg {
  width: 18px;
  height: 18px;
}

/* ==================== EMPTY STATE ==================== */
.empty-state {
  text-align: center;
  padding: 80px 32px;
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  border: 2px dashed var(--border);
}

.empty-icon {
  width: 80px;
  height: 80px;
  background: var(--bg-hover);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
}

.empty-icon svg {
  width: 40px;
  height: 40px;
  color: var(--text-muted);
}

.empty-state h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
}

.empty-state p {
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
}

/* ==================== MOBILE ==================== */
@media (max-width: 768px) {
  .navbar {
    padding: 0 16px;
    height: 64px;
  }

  .navbar-menu {
    display: none;
  }

  .main-container {
    padding-top: 64px;
  }

  .hero {
    padding: 32px 16px;
  }

  .greeting {
    font-size: 24px;
  }

  .stats-row {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .stat-card {
    padding: 16px;
    flex-direction: column;
    text-align: center;
  }

  .content {
    padding: 24px 16px;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .courses-grid {
    grid-template-columns: 1fr;
  }
}

/* ==================== MOBILE MENU ==================== */
.mobile-menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  border: none;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.mobile-menu-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

@media (max-width: 768px) {
  .navbar-user {
    display: flex;
    gap: 8px;
  }

  .mobile-menu-btn {
    display: flex !important;
    align-items: center;
    justify-content: center;
    z-index: 10;
    min-width: 44px;
    min-height: 44px;
  }

  .navbar-menu.open {
    display: flex;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 16px;
    flex-direction: column;
    gap: 8px;
    z-index: 100;
    animation: slideDown 0.2s ease;
  }

  .navbar-menu.open .nav-link {
    padding: 14px 16px;
    background: var(--bg-card);
    border-radius: var(--radius-sm);
  }

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

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

.course-card {
  animation: fadeInUp 0.5s ease forwards;
}

.course-card:nth-child(1) { animation-delay: 0.1s; }
.course-card:nth-child(2) { animation-delay: 0.15s; }
.course-card:nth-child(3) { animation-delay: 0.2s; }
.course-card:nth-child(4) { animation-delay: 0.25s; }
.course-card:nth-child(5) { animation-delay: 0.3s; }
.course-card:nth-child(6) { animation-delay: 0.35s; }