/* ═══════════════════════════════════════════════
   GuideNova Course Marketplace — courses.css
   Theme: Deep space blue + electric accent
   ═══════════════════════════════════════════════ */

/* ── CSS Variables ── */
:root {
  --bg-base:       #0b1120;
  --bg-card:       #111827;
  --bg-card-hover: #161f32;
  --bg-elevated:   #1a2540;
  --bg-sidebar:    #0e1729;
  --accent:        #2563eb;
  --accent-hover:  #1d4ed8;
  --accent-glow:   rgba(37, 99, 235, 0.25);
  --accent-light:  #3b82f6;
  --success:       #10b981;
  --warning:       #f59e0b;
  --danger:        #ef4444;
  --text-primary:  #f8fafc;
  --text-muted:    #94a3b8;
  --text-dim:      #475569;
  --border:        rgba(255, 255, 255, 0.07);
  --border-hover:  rgba(255, 255, 255, 0.14);
  --shadow-card:   0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-modal:  0 24px 80px rgba(0, 0, 0, 0.7);
  --radius-sm:     8px;
  --radius-md:     12px;
  --radius-lg:     18px;
  --radius-xl:     24px;
  --font-display:  'Sora', system-ui, sans-serif;
  --font-body:     'Inter', system-ui, sans-serif;
  --transition:    0.2s ease;
  --header-h:      64px;
}

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, select { font-family: inherit; }
img { display: block; max-width: 100%; }
ul { list-style: none; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0;
  margin: -1px; overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bg-elevated); border-radius: 99px; }

/* ══════════════════════════════
   HEADER
══════════════════════════════ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(11, 17, 32, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 32px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo-mark {
  width: 34px;
  height: 34px;
  background: var(--accent);
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.5px;
}

.logo-mark.small { width: 28px; height: 28px; font-size: 10px; }

.logo-text {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.logo-accent { color: var(--accent-light); }

.header-nav {
  display: flex;
  gap: 24px;
  margin-left: auto;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition);
  padding: 4px 0;
}

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

.header-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

.btn-ghost {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

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

.btn-primary {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  padding: 9px 20px;
  border-radius: var(--radius-sm);
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--accent-glow);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  margin-left: auto;
}

.mobile-menu-btn span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-muted);
  border-radius: 2px;
  transition: var(--transition);
}

/* -- Mobile Nav Drawer -- */
.mobile-nav {
  display: none;
  position: absolute;
  top: var(--header-h);
  left: 0;
  right: 0;
  background: rgba(11, 17, 32, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px 24px;
  z-index: 99;
  transform: translateY(-8px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.mobile-nav.open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 16px;
}

.mobile-nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  transition: color 0.2s ease, background 0.2s ease;
}

.mobile-nav-link:hover,
.mobile-nav-link:active {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.mobile-nav-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mobile-btn-full {
  width: 100%;
  text-align: center;
  padding: 11px 20px;
}

.mobile-nav-overlay {
  position: fixed;
  inset: 0;
  top: var(--header-h);
  z-index: 98;
  background: rgba(0, 0, 0, 0.4);
  display: none;
}

.mobile-nav-overlay.active { display: block; }

/* Three-bar to X animation */
.mobile-menu-btn span {
  transition: transform 0.25s ease, opacity 0.2s ease;
}
.mobile-menu-btn.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.mobile-menu-btn.open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.mobile-menu-btn.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 768px) {
  .mobile-nav { display: block; }
}

/* ══════════════════════════════
   HERO
══════════════════════════════ */
.hero {
  position: relative;
  overflow: hidden;
  padding: 88px 24px 72px;
  text-align: center;
  background: var(--bg-base);
}

.hero-bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
}

.hero-orb-1 {
  width: 560px;
  height: 560px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.18) 0%, transparent 70%);
  top: -180px;
  left: 50%;
  transform: translateX(-50%);
}

.hero-orb-2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.10) 0%, transparent 70%);
  bottom: -100px;
  right: -80px;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 760px;
  margin: 0 auto;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--accent-light);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.eyebrow-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-light);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.7); }
}

.hero-heading {
  font-family: var(--font-display);
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -1.5px;
  color: var(--text-primary);
  margin-bottom: 18px;
}

.hero-gradient-text {
  background: linear-gradient(135deg, #60a5fa 0%, #818cf8 50%, #a78bfa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtext {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 36px;
}

.hero-search-wrap {
  position: relative;
  max-width: 580px;
  margin: 0 auto 40px;
}

.search-icon-wrap {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
  display: flex;
  align-items: center;
  pointer-events: none;
}

.hero-search {
  width: 100%;
  padding: 16px 48px 16px 50px;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 15px;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.hero-search::placeholder { color: var(--text-dim); }

.hero-search:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.search-clear-btn {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
  padding: 4px;
  border-radius: 4px;
  transition: color var(--transition);
  display: flex;
  align-items: center;
}

.search-clear-btn:hover { color: var(--text-primary); }

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat-num {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-sep {
  width: 1px;
  height: 32px;
  background: var(--border);
}

/* ══════════════════════════════
   EXAM TABS
══════════════════════════════ */
.tabs-wrapper {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
}

.tabs-scroll-area {
  overflow-x: auto;
  scrollbar-width: none;
  border-bottom: 1px solid var(--border);
}

.tabs-scroll-area::-webkit-scrollbar { display: none; }

.tabs-list {
  display: flex;
  gap: 4px;
  padding: 16px 0 0;
  width: max-content;
  min-width: 100%;
}

.exam-tab {
  padding: 9px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  transition: color var(--transition), background var(--transition);
  position: relative;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 6px;
}

.exam-tab::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 2px 2px 0 0;
  background: transparent;
  transition: background var(--transition);
}

.exam-tab:hover:not([disabled]) {
  color: var(--text-primary);
  background: rgba(255,255,255,0.04);
}

.exam-tab.active {
  color: var(--accent-light);
  background: rgba(37, 99, 235, 0.08);
}

.exam-tab.active::after { background: var(--accent); }

.exam-tab.coming-soon {
  opacity: 0.5;
  cursor: not-allowed;
}

.tab-soon {
  font-size: 10px;
  font-weight: 600;
  background: var(--bg-elevated);
  color: var(--text-dim);
  padding: 1px 6px;
  border-radius: 99px;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}

/* ══════════════════════════════
   MAIN LAYOUT
══════════════════════════════ */
.main-layout {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.content-row {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 32px;
  padding-top: 28px;
  align-items: start;
}

/* ══════════════════════════════
   SIDEBAR
══════════════════════════════ */
.sidebar {
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: sticky;
  top: calc(var(--header-h) + 16px);
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.sidebar-title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}

.reset-btn {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-light);
  padding: 4px 10px;
  border-radius: 99px;
  border: 1px solid rgba(59, 130, 246, 0.3);
  transition: background var(--transition), color var(--transition);
}

.reset-btn:hover {
  background: var(--accent-glow);
}

.filter-group {
  border-top: 1px solid var(--border);
  padding: 14px 0;
}

.filter-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.3px;
  text-transform: uppercase;
  margin-bottom: 12px;
  cursor: pointer;
  user-select: none;
}

.filter-heading .chevron {
  transition: transform var(--transition);
  color: var(--text-dim);
}

.filter-group.collapsed .chevron { transform: rotate(-90deg); }
.filter-group.collapsed .filter-options { display: none; }

.filter-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.filter-checkbox {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13.5px;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition);
}

.filter-checkbox:hover { color: var(--text-primary); }

.filter-checkbox input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.checkbox-custom {
  width: 16px;
  height: 16px;
  border: 1.5px solid var(--border-hover);
  border-radius: 4px;
  background: transparent;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), border-color var(--transition);
}

.filter-checkbox input:checked + .checkbox-custom {
  background: var(--accent);
  border-color: var(--accent);
}

.filter-checkbox input:checked + .checkbox-custom::after {
  content: '';
  display: block;
  width: 8px;
  height: 5px;
  border-left: 1.5px solid #fff;
  border-bottom: 1.5px solid #fff;
  transform: rotate(-45deg) translateY(-1px);
}

/* Price Range */
.price-range-wrap { padding-top: 4px; }

.price-labels {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 12px;
  font-weight: 500;
}

.range-track {
  position: relative;
  height: 4px;
  background: var(--border-hover);
  border-radius: 99px;
  margin: 0 0 8px;
}

.range-fill {
  position: absolute;
  height: 100%;
  background: var(--accent);
  border-radius: 99px;
  left: 0%;
  right: 0%;
}

.range-input {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: transparent;
  outline: none;
  position: absolute;
  top: 0;
  pointer-events: none;
}

.range-input-min,
.range-input-max {
  position: relative;
  display: block;
  margin: 0;
}

.range-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  pointer-events: all;
  border: 2px solid var(--bg-base);
  box-shadow: 0 0 0 3px var(--accent-glow);
  transition: box-shadow var(--transition);
}

.range-input::-webkit-slider-thumb:hover {
  box-shadow: 0 0 0 5px var(--accent-glow);
}

.range-input::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  pointer-events: all;
  border: 2px solid var(--bg-base);
}

.sidebar-close-btn {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  margin-top: 20px;
  padding: 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: color var(--transition), border-color var(--transition);
}

.sidebar-close-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  z-index: 200;
  backdrop-filter: blur(4px);
}

/* ══════════════════════════════
   RESULTS TOOLBAR
══════════════════════════════ */
.results-section { min-width: 0; }

.results-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  gap: 12px;
  flex-wrap: wrap;
}

.results-count {
  font-size: 14px;
  color: var(--text-muted);
}

.results-count strong { color: var(--text-primary); font-weight: 600; }

.toolbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.filter-toggle-btn {
  display: none;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: color var(--transition), border-color var(--transition);
}

.filter-toggle-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.sort-select {
  padding: 8px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 13px;
  cursor: pointer;
  outline: none;
  transition: border-color var(--transition), color var(--transition);
}

.sort-select:hover,
.sort-select:focus {
  border-color: var(--border-hover);
  color: var(--text-primary);
}

/* ══════════════════════════════
   COURSE GRID
══════════════════════════════ */
.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

/* ── SKELETON CARDS ── */
.skeleton-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  height: 380px;
}

.skeleton-img {
  width: 100%;
  height: 180px;
  background: var(--bg-elevated);
  animation: shimmer 1.6s infinite;
  background: linear-gradient(90deg, var(--bg-elevated) 25%, var(--bg-sidebar) 50%, var(--bg-elevated) 75%);
  background-size: 200% 100%;
}

.skeleton-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.skeleton-line {
  border-radius: 4px;
  animation: shimmer 1.6s infinite;
  background: linear-gradient(90deg, var(--bg-elevated) 25%, var(--bg-sidebar) 50%, var(--bg-elevated) 75%);
  background-size: 200% 100%;
}

.skeleton-line-sm { height: 12px; width: 60%; }
.skeleton-line-md { height: 14px; width: 85%; }
.skeleton-line-lg { height: 18px; width: 90%; }
.skeleton-line-xl { height: 24px; width: 40%; }

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ── COURSE CARD ── */
.course-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  height: 380px;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  cursor: pointer;
  animation: fadeInUp 0.4s ease both;
  will-change: transform;
}

.course-card:hover {
  transform: translateY(-4px);
  border-color: rgba(37, 99, 235, 0.35);
  box-shadow: var(--shadow-card), 0 0 0 1px rgba(37, 99, 235, 0.15);
  background: var(--bg-card-hover);
}

.course-card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Card Image */
.card-img-wrap {
  position: relative;
  width: 100%;
  height: 180px;
  flex-shrink: 0;
  overflow: hidden;
  background: var(--bg-elevated);
}

.card-img-skeleton {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--bg-elevated) 25%, var(--bg-sidebar) 50%, var(--bg-elevated) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.6s infinite;
}

.card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  opacity: 0;
  transition: opacity 0.35s ease;
  position: relative;
  z-index: 1;
}

.card-img.loaded { opacity: 1; }

.card-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 2;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 3px 9px;
  border-radius: 99px;
}

.card-badge.bestseller { background: var(--warning); color: #000; }
.card-badge.top-rated  { background: var(--success); color: #fff; }
.card-badge.premium    { background: linear-gradient(135deg, #7c3aed, #a855f7); color: #fff; }
.card-badge.new        { background: var(--accent); color: #fff; }
.card-badge.budget     { background: #0d9488; color: #fff; }

/* Card Body */
.card-body {
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
  min-height: 0;
}

.card-provider {
  font-size: 11px;
  font-weight: 600;
  color: var(--accent-light);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.card-title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex-shrink: 0;
}

.card-meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.card-meta-item {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  color: var(--text-muted);
}

.card-meta-item svg { flex-shrink: 0; }

.card-features {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: auto;
}

.feature-pill {
  font-size: 11px;
  color: var(--text-dim);
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  padding: 2px 8px;
  border-radius: 99px;
  white-space: nowrap;
}

.card-footer {
  padding: 10px 16px 14px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.card-price-wrap { display: flex; align-items: baseline; gap: 6px; }

.card-price {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.card-original-price {
  font-size: 12px;
  color: var(--text-dim);
  text-decoration: line-through;
}

.card-view-btn {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-light);
  padding: 6px 14px;
  border: 1px solid rgba(59, 130, 246, 0.35);
  border-radius: 99px;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.card-view-btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ── Validity ── */
.card-validity {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-muted);
}

.card-validity svg {
  flex-shrink: 0;
  color: var(--accent-light);
}

.validity-label {
  font-weight: 600;
  color: var(--text-dim);
}

.validity-value {
  font-weight: 600;
  color: var(--success);
}

/* ══════════════════════════════
   EMPTY & ERROR STATES
══════════════════════════════ */
.empty-state,
.error-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 72px 24px;
}

.empty-icon,
.error-icon {
  font-size: 48px;
  margin-bottom: 16px;
  color: var(--text-dim);
}

.empty-title,
.error-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.empty-sub,
.error-sub {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

/* ══════════════════════════════
   MODAL
══════════════════════════════ */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border-hover);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  box-shadow: var(--shadow-modal);
  transform: translateY(20px) scale(0.97);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  scrollbar-width: thin;
}

.modal-backdrop.open .modal {
  transform: translateY(0) scale(1);
}

.modal-close-btn {
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 10;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: background var(--transition), color var(--transition);
}

.modal-close-btn:hover {
  background: rgba(0, 0, 0, 0.7);
  color: var(--text-primary);
}

.modal-img-wrap {
  position: relative;
  width: 100%;
  height: 220px;
  overflow: hidden;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  background: var(--bg-elevated);
  flex-shrink: 0;
}

.modal-img-skeleton {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--bg-elevated) 25%, var(--bg-sidebar) 50%, var(--bg-elevated) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.6s infinite;
}

.modal-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 0.3s ease;
  position: relative;
  z-index: 1;
}

.modal-img.loaded { opacity: 1; }

.modal-body {
  padding: 24px;
}

.modal-meta-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.modal-provider {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-light);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.modal-badge {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  padding: 2px 8px;
  border-radius: 99px;
  background: var(--warning);
  color: #000;
}

.modal-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
  margin-bottom: 20px;
  letter-spacing: -0.3px;
}

.modal-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 24px;
}

.modal-info-item {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.info-icon { font-size: 18px; flex-shrink: 0; }

.info-label {
  font-size: 11px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 2px;
}

.info-value {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.modal-section { margin-bottom: 20px; }

.modal-section-title {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-dim);
  margin-bottom: 10px;
}

.modal-faculty-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.faculty-chip {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  background: rgba(37, 99, 235, 0.12);
  border: 1px solid rgba(37, 99, 235, 0.25);
  padding: 5px 12px;
  border-radius: 99px;
}

.modal-features-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.modal-feature-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
}

.modal-feature-item::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
  flex-shrink: 0;
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 12px;
}

.btn-enroll {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  background: var(--accent);
  padding: 13px 28px;
  border-radius: var(--radius-md);
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}

.btn-enroll:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--accent-glow);
}

.modal-students {
  font-size: 13px;
  color: var(--text-muted);
}

.modal-students strong { color: var(--text-primary); }

/* ══════════════════════════════
   FOOTER
══════════════════════════════ */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 24px;
}

.footer-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-tagline {
  font-size: 14px;
  color: var(--text-muted);
  font-style: italic;
}

.footer-copy {
  font-size: 12px;
  color: var(--text-dim);
}

/* ══════════════════════════════
   STAGGER ANIMATION
══════════════════════════════ */
.course-card:nth-child(1)  { animation-delay: 0.00s; }
.course-card:nth-child(2)  { animation-delay: 0.05s; }
.course-card:nth-child(3)  { animation-delay: 0.10s; }
.course-card:nth-child(4)  { animation-delay: 0.15s; }
.course-card:nth-child(5)  { animation-delay: 0.20s; }
.course-card:nth-child(6)  { animation-delay: 0.25s; }
.course-card:nth-child(7)  { animation-delay: 0.30s; }
.course-card:nth-child(8)  { animation-delay: 0.35s; }

/* ══════════════════════════════
   RESPONSIVE
══════════════════════════════ */

/* Tablet */
@media (max-width: 1024px) {
  .content-row {
    grid-template-columns: 220px 1fr;
    gap: 24px;
  }

  .header-nav { display: none; }

  .course-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  }
}

/* Mobile */
@media (max-width: 768px) {
  .header-actions { display: none; }
  .mobile-menu-btn { display: flex; }

  .hero { padding: 60px 20px 52px; }
  .hero-heading { letter-spacing: -0.8px; }
  .hero-stats { gap: 20px; }
  .stat-sep { height: 24px; }

  .main-layout { padding: 0 16px 60px; }
  .tabs-wrapper { padding: 0 16px; }

  /* Sidebar becomes a drawer on mobile */
  .content-row {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .sidebar {
    position: fixed;
    left: -100%;
    top: 0;
    bottom: 0;
    width: 85%;
    max-width: 320px;
    z-index: 300;
    border-radius: 0;
    overflow-y: auto;
    transition: left 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    border: none;
    border-right: 1px solid var(--border);
    padding-top: calc(var(--header-h) + 20px);
  }

  .sidebar.open {
    left: 0;
  }

  .sidebar-overlay {
    display: block;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
  }

  .sidebar-overlay.active {
    opacity: 1;
    pointer-events: all;
  }

  .sidebar-close-btn { display: flex; }

  .filter-toggle-btn { display: flex; }

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

  .course-card { height: 340px; }

  .card-img-wrap { height: 150px; }

  .card-body { padding: 12px 12px 8px; gap: 6px; }
  .card-footer { padding: 8px 12px 12px; }

  .card-title { font-size: 13px; }
  .card-price { font-size: 16px; }

  .modal-info-grid { grid-template-columns: 1fr 1fr; }
  .modal-features-list { grid-template-columns: 1fr; }
}

/* Small mobile */
@media (max-width: 480px) {
  .course-grid {
    grid-template-columns: 1fr;
  }

  .course-card { height: 340px; }

  .hero-stats { flex-direction: row; justify-content: center; gap: 16px; }
  .stat-sep { display: none; }

  .modal-info-grid { grid-template-columns: 1fr 1fr; }

  .footer-inner { flex-direction: column; align-items: flex-start; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}