/* ===================================================
   Course2Learn: Emerald Green SaaS Theme
   course2learn.in | Your Learning Assistant.
   =================================================== */

:root {
  --primary:    #059669;
  --primary-dk: #047857;
  --primary-lt: #D1FAE5;
  --accent:     #F59E0B;
  --accent-dk:  #D97706;
  --dark:       #111827;
  --gray-900:   #1F2937;
  --gray-700:   #374151;
  --gray-500:   #6B7280;
  --gray-300:   #D1D5DB;
  --gray-100:   #F3F4F6;
  --white:      #FFFFFF;
  --bg:         #F9FAFB;
  --card-bg:    #FFFFFF;
  --shadow-sm:  0 1px 3px rgba(0,0,0,.08);
  --shadow:     0 4px 16px rgba(0,0,0,.10);
  --shadow-lg:  0 8px 32px rgba(0,0,0,.13);
  --radius:     12px;
  --radius-sm:  8px;
  --radius-lg:  16px;
  --font:       'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --transition: 0.2s ease;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font); background: var(--bg); color: var(--dark); line-height: 1.6; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
ul { list-style: none; }

/* ---- Typography ---- */
h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 800; line-height: 1.15; }
h2 { font-size: clamp(1.3rem, 3vw, 2rem);   font-weight: 700; line-height: 1.25; }
h3 { font-size: 1.15rem; font-weight: 600; }
h4 { font-size: 1rem;    font-weight: 600; }
p  { color: var(--gray-700); }

/* ---- Layout helpers ---- */
.container    { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section      { padding: 56px 0; }
.section-sm   { padding: 32px 0; }
.flex         { display: flex; }
.flex-center  { display: flex; align-items: center; justify-content: center; }
.grid-2       { display: grid; grid-template-columns: repeat(2,1fr); gap: 24px; }
.grid-3       { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.grid-4       { display: grid; grid-template-columns: repeat(4,1fr); gap: 20px; }
.gap-4        { gap: 16px; }

/* ============================
   NAVIGATION
   ============================ */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--gray-300);
  box-shadow: var(--shadow-sm);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px; gap: 20px;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.25rem; font-weight: 800; color: var(--primary);
  flex-shrink: 0;
}
.nav-logo img { height: 36px; width: auto; }
.nav-logo span { color: var(--dark); }
.nav-logo .tagline { font-size: 0.65rem; font-weight: 400; color: var(--gray-500); display: block; line-height: 1; }

.nav-search {
  flex: 1; max-width: 460px;
  display: flex; align-items: center;
  background: var(--gray-100); border-radius: 50px;
  border: 1.5px solid var(--gray-300);
  overflow: hidden; transition: border-color var(--transition);
}
.nav-search:focus-within { border-color: var(--primary); background: var(--white); }
.nav-search input {
  flex: 1; border: none; background: transparent;
  padding: 10px 16px; font-size: 0.9rem; outline: none;
}
.nav-search button {
  padding: 8px 16px; background: var(--primary); color: var(--white);
  font-size: 0.9rem; border-radius: 50px;
  margin: 4px; transition: background var(--transition);
}
.nav-search button:hover { background: var(--primary-dk); }

.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  padding: 8px 14px; border-radius: var(--radius-sm);
  font-size: 0.9rem; font-weight: 500; color: var(--gray-700);
  transition: all var(--transition);
}
.nav-links a:hover,
.nav-links a.active { background: var(--primary-lt); color: var(--primary); }

.nav-menu-btn { display: none; padding: 8px; font-size: 1.4rem; color: var(--gray-700); }

/* Mobile nav */
.mobile-nav {
  display: none; flex-direction: column; gap: 4px;
  background: var(--white); border-bottom: 1px solid var(--gray-300);
  padding: 12px 20px;
}
.mobile-nav.open { display: flex; }
.mobile-nav a {
  padding: 10px 14px; border-radius: var(--radius-sm);
  font-size: 0.95rem; font-weight: 500; color: var(--gray-700);
}
.mobile-nav a:hover { background: var(--primary-lt); color: var(--primary); }

/* ============================
   HERO
   ============================ */
.hero {
  background: linear-gradient(135deg, #ECFDF5 0%, #F0FDF4 50%, #FEF9C3 100%);
  padding: 72px 0 56px;
  text-align: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--primary-lt); color: var(--primary);
  padding: 5px 14px; border-radius: 50px;
  font-size: 0.78rem; font-weight: 600; margin-bottom: 20px;
  border: 1px solid #A7F3D0;
}
.hero h1 { color: var(--dark); margin-bottom: 16px; }
.hero h1 em { font-style: normal; color: var(--primary); }
.hero p { font-size: 1.1rem; color: var(--gray-500); max-width: 560px; margin: 0 auto 36px; }

.hero-search {
  display: flex; max-width: 620px; margin: 0 auto 28px;
  background: var(--white); border-radius: 50px;
  box-shadow: var(--shadow-lg); overflow: hidden;
  border: 2px solid var(--gray-300);
  transition: border-color var(--transition);
}
.hero-search:focus-within { border-color: var(--primary); }
.hero-search input {
  flex: 1; border: none; padding: 16px 24px;
  font-size: 1rem; outline: none; background: transparent;
}
.hero-search button {
  background: var(--primary); color: var(--white);
  padding: 14px 28px; font-size: 1rem; font-weight: 600;
  border-radius: 50px; margin: 4px;
  transition: background var(--transition);
  white-space: nowrap;
}
.hero-search button:hover { background: var(--primary-dk); }

.hero-pills { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.hero-pill {
  background: var(--white); border: 1px solid var(--gray-300);
  padding: 6px 16px; border-radius: 50px;
  font-size: 0.83rem; color: var(--gray-700); cursor: pointer;
  transition: all var(--transition);
}
.hero-pill:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-lt); }

.hero-stats {
  display: flex; justify-content: center; gap: 40px;
  margin-top: 48px; padding-top: 36px;
  border-top: 1px solid rgba(5,150,105,0.15);
}
.stat-item { text-align: center; }
.stat-num { font-size: 1.6rem; font-weight: 800; color: var(--primary); display: block; }
.stat-lbl { font-size: 0.8rem; color: var(--gray-500); }

/* ============================
   SECTION HEADERS
   ============================ */
.section-header {
  display: flex; align-items: flex-end; justify-content: space-between;
  margin-bottom: 28px; flex-wrap: wrap; gap: 12px;
}
.section-header h2 { color: var(--dark); }
.section-header p  { color: var(--gray-500); font-size: 0.95rem; margin-top: 4px; }
.view-all {
  font-size: 0.88rem; font-weight: 600; color: var(--primary);
  display: flex; align-items: center; gap: 4px; white-space: nowrap;
  transition: gap var(--transition);
}
.view-all:hover { gap: 8px; }

/* ============================
   CATEGORY GROUPS
   ============================ */
.cat-group { margin-bottom: 32px; }
.cat-group:last-child { margin-bottom: 0; }
.cat-group-label {
  font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--primary);
  margin-bottom: 14px; padding-bottom: 6px;
  border-bottom: 2px solid var(--primary-lt);
}
.mobile-nav-group {
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--primary);
  padding: 12px 20px 4px; margin-top: 4px;
  background: var(--primary-lt);
}

/* ============================
   CATEGORY CARDS
   ============================ */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px,1fr));
  gap: 14px;
}
.cat-card {
  background: var(--white); border: 1.5px solid var(--gray-300);
  border-radius: var(--radius); padding: 20px 14px;
  text-align: center; cursor: pointer;
  transition: all var(--transition);
  display: flex; flex-direction: column; align-items: center; gap: 10px;
}
.cat-card:hover { border-color: var(--primary); box-shadow: var(--shadow); transform: translateY(-2px); }
.cat-card.active { border-color: var(--primary); background: var(--primary-lt); }
.cat-icon { font-size: 2rem; line-height: 1; }
.cat-name { font-size: 0.85rem; font-weight: 600; color: var(--dark); }
.cat-count { font-size: 0.75rem; color: var(--gray-500); }

/* ============================
   COURSE CARDS
   ============================ */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px,1fr));
  gap: 20px;
}
.course-card {
  background: var(--card-bg); border-radius: var(--radius);
  border: 1.5px solid var(--gray-300); overflow: hidden;
  transition: all var(--transition); cursor: pointer;
  display: flex; flex-direction: column;
}
.course-card:hover { box-shadow: var(--shadow-lg); border-color: var(--primary); transform: translateY(-3px); }

.card-thumb {
  position: relative; height: 160px; overflow: hidden;
}
.card-thumb-bg {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  font-size: 3.5rem; flex-shrink: 0;
}
.card-badges {
  position: absolute; top: 10px; left: 10px;
  display: flex; gap: 5px; flex-wrap: wrap;
}
.badge {
  padding: 3px 9px; border-radius: 50px; font-size: 0.7rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.03em;
}
.badge-free    { background: #D1FAE5; color: #065F46; }
.badge-paid    { background: #FEF3C7; color: #92400E; }
.badge-cert    { background: #E0F2FE; color: #075985; }
.badge-featured { background: var(--accent); color: var(--white); }
.badge-level-beginner     { background: #D1FAE5; color: #065F46; }
.badge-level-intermediate { background: #FEF3C7; color: #92400E; }
.badge-level-advanced     { background: #FCE7F3; color: #831843; }

.card-body { padding: 16px; flex: 1; display: flex; flex-direction: column; gap: 8px; }
.card-provider { font-size: 0.75rem; font-weight: 600; color: var(--primary); text-transform: uppercase; letter-spacing: 0.05em; }
.card-title { font-size: 0.95rem; font-weight: 700; color: var(--dark); line-height: 1.35; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card-instructor { font-size: 0.78rem; color: var(--gray-500); }

.card-meta { display: flex; align-items: center; gap: 12px; margin-top: 4px; }
.card-rating { display: flex; align-items: center; gap: 3px; font-size: 0.8rem; font-weight: 700; color: var(--accent-dk); }
.card-rating-stars { color: var(--accent); }
.card-students { font-size: 0.75rem; color: var(--gray-500); }
.card-duration { font-size: 0.78rem; color: var(--gray-500); display: flex; align-items: center; gap: 3px; }

.card-footer {
  padding: 12px 16px; border-top: 1px solid var(--gray-100);
  display: flex; align-items: center; justify-content: space-between;
}
.card-price { font-size: 1rem; font-weight: 800; color: var(--dark); }
.card-price.free-price { color: var(--primary); }
.card-btn {
  background: var(--primary); color: var(--white);
  padding: 7px 16px; border-radius: 50px;
  font-size: 0.8rem; font-weight: 600;
  transition: background var(--transition);
}
.card-btn:hover { background: var(--primary-dk); }

/* ============================
   FILTERS SIDEBAR
   ============================ */
.page-layout { display: flex; gap: 24px; align-items: flex-start; }
.filter-sidebar {
  width: 240px; flex-shrink: 0;
  background: var(--white); border: 1.5px solid var(--gray-300);
  border-radius: var(--radius); padding: 20px; position: sticky; top: 84px;
}
.filter-sidebar h3 { font-size: 1rem; font-weight: 700; margin-bottom: 16px; color: var(--dark); }
.filter-group { margin-bottom: 20px; }
.filter-group h4 { font-size: 0.82rem; font-weight: 700; color: var(--gray-500); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 10px; }
.filter-option {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 4px; cursor: pointer;
  font-size: 0.88rem; color: var(--gray-700); border-radius: 6px;
  transition: all var(--transition);
}
.filter-option:hover { background: var(--primary-lt); color: var(--primary); }
.filter-option input[type="checkbox"] { accent-color: var(--primary); width: 14px; height: 14px; }
.filter-option input[type="radio"]    { accent-color: var(--primary); width: 14px; height: 14px; }

.filter-clear {
  width: 100%; padding: 10px; border-radius: var(--radius-sm);
  border: 1.5px solid var(--gray-300); font-size: 0.85rem; font-weight: 600;
  color: var(--gray-700); transition: all var(--transition); margin-top: 8px;
  background: transparent;
}
.filter-clear:hover { border-color: var(--primary); color: var(--primary); }

.filter-mobile-toggle {
  display: none; align-items: center; gap: 8px;
  background: var(--white); border: 1.5px solid var(--gray-300);
  border-radius: var(--radius-sm); padding: 10px 16px;
  font-size: 0.9rem; font-weight: 600; color: var(--gray-700);
  margin-bottom: 16px; transition: all var(--transition);
}
.filter-mobile-toggle:hover { border-color: var(--primary); color: var(--primary); }

.results-main { flex: 1; min-width: 0; }

/* ============================
   SORT BAR
   ============================ */
.sort-bar {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px; flex-wrap: wrap; gap: 12px;
}
.results-count { font-size: 0.9rem; color: var(--gray-500); }
.results-count strong { color: var(--dark); }
.sort-select {
  padding: 8px 12px; border-radius: var(--radius-sm);
  border: 1.5px solid var(--gray-300); font-size: 0.88rem;
  background: var(--white); color: var(--dark); outline: none;
  cursor: pointer; font-family: var(--font);
}
.sort-select:focus { border-color: var(--primary); }

/* ============================
   COURSE DETAIL PAGE
   ============================ */
.detail-hero {
  background: linear-gradient(135deg, #ECFDF5, #F0FDF4);
  padding: 48px 0;
}
.detail-layout { display: flex; gap: 32px; align-items: flex-start; }
.detail-content { flex: 1; }
.detail-breadcrumb {
  display: flex; align-items: center; gap: 6px;
  font-size: 0.82rem; color: var(--gray-500); margin-bottom: 16px;
}
.detail-breadcrumb a { color: var(--primary); }
.detail-breadcrumb span { color: var(--gray-300); }
.detail-title { font-size: clamp(1.4rem, 3vw, 2rem); font-weight: 800; margin-bottom: 12px; color: var(--dark); }
.detail-meta-row {
  display: flex; align-items: center; flex-wrap: wrap; gap: 16px; margin-bottom: 16px;
}
.detail-instructor { font-size: 0.9rem; color: var(--gray-700); }
.detail-instructor strong { color: var(--primary); }
.detail-rating { display: flex; align-items: center; gap: 4px; font-weight: 700; color: var(--accent-dk); }
.detail-desc { color: var(--gray-700); line-height: 1.75; max-width: 680px; }

.detail-card {
  width: 300px; flex-shrink: 0; position: sticky; top: 84px;
  background: var(--white); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); overflow: hidden;
  border: 1.5px solid var(--gray-300);
}
.detail-card-thumb {
  height: 180px; display: flex; align-items: center;
  justify-content: center; font-size: 5rem;
}
.detail-card-body { padding: 20px; }
.detail-price { font-size: 1.8rem; font-weight: 900; color: var(--dark); margin-bottom: 4px; }
.detail-price.free { color: var(--primary); }
.detail-enroll-btn {
  width: 100%; background: var(--accent); color: var(--white);
  padding: 14px; border-radius: var(--radius-sm);
  font-size: 1rem; font-weight: 700; text-align: center;
  display: block; transition: background var(--transition); margin-bottom: 12px;
}
.detail-enroll-btn:hover { background: var(--accent-dk); }
.detail-card-features { display: flex; flex-direction: column; gap: 8px; }
.detail-feature { display: flex; align-items: center; gap: 8px; font-size: 0.85rem; color: var(--gray-700); }
.detail-feature .icon { color: var(--primary); font-size: 1rem; }

.detail-body { padding: 48px 0; }
.skills-grid { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.skill-tag {
  background: var(--primary-lt); color: var(--primary-dk);
  padding: 5px 14px; border-radius: 50px;
  font-size: 0.82rem; font-weight: 600; border: 1px solid #A7F3D0;
}
.detail-specs { display: grid; grid-template-columns: repeat(2,1fr); gap: 16px; margin-top: 16px; }
.spec-item { background: var(--gray-100); border-radius: var(--radius-sm); padding: 14px; }
.spec-label { font-size: 0.75rem; color: var(--gray-500); font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 4px; }
.spec-value { font-size: 0.95rem; font-weight: 700; color: var(--dark); }

/* ============================
   SEARCH PAGE
   ============================ */
.search-header { padding: 32px 0 24px; }
.search-header h2 { font-size: 1.4rem; }
.search-header h2 em { color: var(--primary); font-style: normal; }
.active-filters { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.active-filter {
  display: flex; align-items: center; gap: 6px;
  background: var(--primary-lt); color: var(--primary);
  padding: 4px 12px; border-radius: 50px;
  font-size: 0.8rem; font-weight: 600; border: 1px solid #A7F3D0;
}
.active-filter button { font-size: 1rem; line-height: 1; color: var(--primary); }

/* ============================
   CATEGORY PAGE HEADER
   ============================ */
.cat-page-header {
  padding: 40px 0 32px;
  border-bottom: 1px solid var(--gray-300);
  margin-bottom: 32px;
}
.cat-page-header h1 { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.cat-page-header p { color: var(--gray-500); }

/* ============================
   EMPTY STATE
   ============================ */
.empty-state { text-align: center; padding: 64px 20px; }
.empty-icon { font-size: 4rem; margin-bottom: 16px; }
.empty-state h3 { margin-bottom: 8px; }
.empty-state p  { color: var(--gray-500); margin-bottom: 24px; }
.btn-primary {
  background: var(--primary); color: var(--white);
  padding: 12px 28px; border-radius: 50px;
  font-size: 0.95rem; font-weight: 600; display: inline-block;
  transition: background var(--transition);
}
.btn-primary:hover { background: var(--primary-dk); }

/* ============================
   PAGINATION
   ============================ */
.pagination { display: flex; justify-content: center; gap: 6px; margin-top: 40px; flex-wrap: wrap; }
.page-btn {
  width: 38px; height: 38px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.88rem; font-weight: 600; color: var(--gray-700);
  border: 1.5px solid var(--gray-300); transition: all var(--transition);
  background: var(--white); cursor: pointer;
}
.page-btn:hover      { border-color: var(--primary); color: var(--primary); }
.page-btn.active     { background: var(--primary); border-color: var(--primary); color: var(--white); }
.page-btn.ellipsis   { border: none; cursor: default; }

/* ============================
   DEAL BANNER (Coursera Plus)
   ============================ */
.deal-banner-section { background: linear-gradient(135deg, #064e3b 0%, #065f46 60%, #047857 100%); padding: 32px 0; }
.deal-banner {
  display: flex; align-items: center; gap: 40px;
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-lg); padding: 32px 40px;
  cursor: pointer; transition: var(--transition); position: relative; overflow: hidden;
}
.deal-banner:hover { background: rgba(255,255,255,0.1); transform: translateY(-1px); }
.deal-banner-badge {
  position: absolute; top: 14px; right: 16px;
  font-size: 0.65rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em;
  color: rgba(255,255,255,0.6); border: 1px solid rgba(255,255,255,0.25);
  padding: 3px 8px; border-radius: 20px;
}
.deal-banner-left { flex: 1; }
.deal-banner-logo { font-size: 1.1rem; font-weight: 800; color: #fff; margin-bottom: 8px; }
.deal-banner-logo span { background: var(--accent); color: #000; padding: 1px 6px; border-radius: 4px; margin-left: 3px; font-size: 0.75rem; font-weight: 800; }
.deal-banner-left h3 { font-size: 1.3rem; font-weight: 800; color: #fff; margin-bottom: 8px; line-height: 1.3; }
.deal-banner-left p { font-size: 0.9rem; color: rgba(255,255,255,0.8); margin-bottom: 14px; line-height: 1.6; }
.deal-features { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 6px 20px; }
.deal-features li { font-size: 0.82rem; color: rgba(255,255,255,0.85); }
.deal-banner-right { flex-shrink: 0; text-align: center; }
.deal-price-box {
  background: rgba(255,255,255,0.12); border: 2px solid var(--accent);
  border-radius: var(--radius); padding: 24px 32px; min-width: 200px;
}
.deal-discount { font-size: 1.4rem; font-weight: 900; color: var(--accent); letter-spacing: -0.5px; }
.deal-price-label { font-size: 0.8rem; color: rgba(255,255,255,0.7); margin: 4px 0 16px; }
.deal-cta-btn {
  background: var(--accent); color: #000; font-weight: 800; font-size: 0.9rem;
  padding: 12px 20px; border-radius: var(--radius-sm); cursor: pointer;
  transition: var(--transition); white-space: nowrap;
}
.deal-banner:hover .deal-cta-btn { background: var(--accent-dk); }
.deal-note { font-size: 0.72rem; color: rgba(255,255,255,0.5); margin-top: 8px; }

@media (max-width: 768px) {
  .deal-banner { flex-direction: column; padding: 24px 20px; gap: 24px; }
  .deal-banner-right { width: 100%; }
  .deal-price-box { min-width: unset; padding: 20px; }
  .deal-banner-badge { top: 10px; right: 10px; }
}

/* ============================
   FOOTER
   ============================ */
footer {
  background: var(--gray-900); color: var(--gray-300);
  padding: 56px 0 0;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 40px; }
.footer-brand p { font-size: 0.88rem; margin-top: 12px; color: var(--gray-500); line-height: 1.7; }
.footer-logo { display: flex; align-items: center; gap: 8px; font-size: 1.15rem; font-weight: 800; color: var(--white); }
.footer-logo span { color: var(--primary); }
.footer-col h4 { font-size: 0.85rem; font-weight: 700; color: var(--white); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 14px; }
.footer-col ul { display: flex; flex-direction: column; gap: 8px; }
.footer-col a { font-size: 0.88rem; color: var(--gray-500); transition: color var(--transition); }
.footer-col a:hover { color: var(--primary); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 20px 0; display: flex; align-items: center;
  justify-content: space-between; flex-wrap: wrap; gap: 12px;
}
.footer-bottom p { font-size: 0.82rem; color: var(--gray-500); }
.footer-bottom a { color: var(--primary); }

/* ============================
   LOADING SKELETON
   ============================ */
.skeleton { background: linear-gradient(90deg, var(--gray-100) 25%, var(--gray-300) 50%, var(--gray-100) 75%); background-size: 200% 100%; animation: shimmer 1.4s infinite; border-radius: 6px; }
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }
.skeleton-card { background: var(--white); border-radius: var(--radius); border: 1.5px solid var(--gray-300); overflow: hidden; }
.sk-thumb   { height: 160px; }
.sk-body    { padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.sk-line    { height: 14px; }
.sk-title   { height: 16px; width: 90%; }
.sk-short   { height: 12px; width: 55%; }

/* ============================
   TOAST / NOTIFICATION
   ============================ */
.toast {
  position: fixed; bottom: 24px; right: 24px; z-index: 999;
  background: var(--dark); color: var(--white);
  padding: 12px 20px; border-radius: var(--radius-sm);
  font-size: 0.88rem; font-weight: 600; box-shadow: var(--shadow-lg);
  transform: translateY(100px); opacity: 0;
  transition: all 0.3s ease;
}
.toast.show { transform: translateY(0); opacity: 1; }

/* ============================
   MISC COMPONENTS
   ============================ */
.tag-list { display: flex; flex-wrap: wrap; gap: 6px; }
.tag { background: var(--gray-100); color: var(--gray-700); padding: 3px 10px; border-radius: 50px; font-size: 0.75rem; }

.divider { border: none; border-top: 1px solid var(--gray-300); margin: 32px 0; }

.no-courses {
  text-align: center; padding: 60px 20px; grid-column: 1 / -1;
}
.no-courses h3 { margin-bottom: 8px; }
.no-courses p { color: var(--gray-500); }

/* ============================
   RESPONSIVE
   ============================ */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .detail-card { width: 260px; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-menu-btn { display: block; }
  .nav-search { display: none; }

  .hero { padding: 48px 0 36px; }
  .hero-stats { gap: 24px; }

  .page-layout { flex-direction: column; }
  .filter-sidebar { width: 100%; position: static; display: none; }
  .filter-sidebar.mobile-open { display: block; }
  .filter-mobile-toggle { display: flex; }

  .detail-layout { flex-direction: column; }
  .detail-card { width: 100%; position: static; }

  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }

  .courses-grid { grid-template-columns: repeat(auto-fill, minmax(240px,1fr)); }
  .categories-grid { grid-template-columns: repeat(auto-fill, minmax(110px,1fr)); }
  .detail-specs { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero-stats { flex-direction: column; gap: 16px; }
  .courses-grid { grid-template-columns: 1fr; }
  .hero-search { flex-direction: column; border-radius: var(--radius); }
  .hero-search input { padding: 14px 18px; }
  .hero-search button { margin: 4px; width: 100%; }
  .sort-bar { flex-direction: column; align-items: flex-start; }
}