/* Aetheria Learning Platform — Premium dark-luxe design */
:root {
  --platform-blue: #47b2e4;
  --platform-blue-dark: #209dd8;
  --platform-blue-deep: #37517e;
  --platform-blue-light: #e8f4fc;
  --platform-accent: #5c7cfa;
  --platform-glow: rgba(71, 178, 228, 0.45);
  --platform-navy: #0c0f14;
  --platform-dark: #111827;
  --platform-gray: #94a3b8;
  --platform-gray-light: #f1f5f9;
  --platform-border: #1e293b;
  --platform-border-light: #e2e8f0;
  --platform-white: #fff;
  --platform-success: #10b981;
  --platform-warning: #f59e0b;
  --platform-radius: 16px;
  --platform-radius-sm: 10px;
  --platform-shadow: 0 4px 24px rgba(0,0,0,0.12);
  --platform-shadow-lg: 0 24px 64px rgba(0,0,0,0.28);
  --platform-font: 'Plus Jakarta Sans', 'Segoe UI', system-ui, sans-serif;
  --platform-heading: 'Plus Jakarta Sans', 'Jost', sans-serif;
  --grad-hero: radial-gradient(ellipse 120% 80% at 50% -20%, #1a3a52 0%, #0c0f14 45%, #06080b 100%);
  --grad-brand: linear-gradient(135deg, #47b2e4 0%, #5c7cfa 50%, #37517e 100%);
  --grad-tech: linear-gradient(135deg, #1e3a5f 0%, #47b2e4 100%);
  --grad-business: linear-gradient(135deg, #0f766e 0%, #2dd4bf 100%);
  --grad-life: linear-gradient(135deg, #6d28d9 0%, #c084fc 100%);
  --nav-height: 72px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body.platform-body {
  font-family: var(--platform-font);
  color: #1e293b;
  background: var(--platform-white);
  margin: 0;
  padding-top: var(--nav-height);
  -webkit-font-smoothing: antialiased;
}

/* ===== Top Navigation — dark glass ===== */
.platform-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(6, 8, 11, 0.82);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  z-index: 1000;
  display: flex;
  align-items: center;
  padding: 0 max(20px, 4vw);
  gap: 16px;
  transition: background 0.3s, box-shadow 0.3s;
}

.platform-nav.nav-scrolled {
  background: rgba(6, 8, 11, 0.96);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

.platform-nav .nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo-icon {
  display: block;
  border-radius: 8px;
  flex-shrink: 0;
}

.nav-logo-wordmark {
  height: 38px;
  width: auto;
  display: block;
  flex-shrink: 0;
  mix-blend-mode: lighten;
  object-fit: contain;
}

.nav-logo-sub {
  font-family: var(--platform-heading);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 4px;
  color: rgba(71, 178, 228, 0.85);
  margin-top: 2px;
}

.nav-logo-brand {
  height: 46px;
  width: auto;
  display: block;
  border-radius: 6px;
  filter: drop-shadow(0 2px 20px rgba(71,178,228,0.25));
}

.footer-logo-brand {
  height: 50px;
  width: auto;
  margin-bottom: 16px;
  display: block;
  filter: drop-shadow(0 2px 16px rgba(71,178,228,0.2));
}

.platform-nav .nav-explore {
  position: relative;
}

.platform-nav .nav-explore-btn {
  background: none;
  border: none;
  font-size: 0.95rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.85);
  padding: 8px 12px;
  cursor: pointer;
  border-radius: var(--platform-radius);
}

.platform-nav .nav-explore-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

.platform-nav .nav-search {
  flex: 1;
  max-width: 560px;
  position: relative;
}

.platform-nav .nav-search input {
  width: 100%;
  padding: 11px 16px 11px 42px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  font-size: 0.95rem;
  outline: none;
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  transition: box-shadow 0.2s, border-color 0.2s, background 0.2s;
}

.platform-nav .nav-search input::placeholder {
  color: rgba(255, 255, 255, 0.45);
}

.platform-nav .nav-search input:focus {
  background: rgba(255, 255, 255, 0.14);
  border-color: var(--platform-blue);
  box-shadow: 0 0 0 3px rgba(71, 178, 228, 0.25);
  color: #fff;
}

.platform-nav .nav-search i {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: rgba(255, 255, 255, 0.5);
  pointer-events: none;
}

.platform-nav .nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.platform-nav .nav-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: var(--platform-radius);
  white-space: nowrap;
  transition: background 0.2s, color 0.2s;
}

.platform-nav .nav-link:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

.nav-link-active {
  color: var(--platform-blue) !important;
}

.platform-nav .nav-btn-primary {
  background: var(--grad-brand);
  color: var(--platform-white) !important;
  border-radius: 999px;
  box-shadow: 0 4px 14px rgba(71, 178, 228, 0.35);
}

.platform-nav .nav-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(71, 178, 228, 0.5);
  background: var(--grad-brand);
  color: #fff !important;
}

.nav-mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  margin-left: auto;
  padding: 8px;
  color: #fff;
}

.nav-mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  padding: 12px 16px 20px;
  z-index: 999;
  flex-direction: column;
  gap: 6px;
  background: rgba(12, 15, 20, 0.98);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(16px);
}

.nav-mobile-menu.open { display: flex; }

.nav-mobile-menu a {
  padding: 14px 18px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: 12px;
  color: rgba(255, 255, 255, 0.9);
  transition: background 0.2s, color 0.2s;
}

.nav-mobile-menu a:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

.nav-mobile-menu .nav-mobile-cta {
  background: var(--grad-brand);
  color: var(--platform-white) !important;
  text-align: center;
  margin-top: 8px;
  border-radius: 999px;
  padding: 14px 20px;
  font-weight: 700;
  box-shadow: 0 4px 14px rgba(71, 178, 228, 0.35);
}

.nav-mobile-menu .nav-mobile-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(71, 178, 228, 0.45);
}

/* Explore dropdown */
.explore-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--platform-white);
  border: 1px solid var(--platform-border);
  box-shadow: var(--platform-shadow);
  border-radius: var(--platform-radius);
  min-width: 220px;
  padding: 8px 0;
  z-index: 1001;
}

.explore-dropdown.show { display: block; }

.explore-dropdown a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 20px;
  color: var(--platform-navy);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
}

.explore-dropdown a i { color: var(--platform-blue); }

.explore-dropdown a:hover { background: var(--platform-gray-light); }

/* ===== Hero ===== */
/* ===== Hero — cinematic dark ===== */
.hero-premium {
  background: var(--grad-hero);
  color: var(--platform-white);
  padding: 48px max(20px, 4vw) 110px;
  position: relative;
  overflow: hidden;
  min-height: 580px;
  display: flex;
  align-items: center;
  margin-top: calc(-1 * var(--nav-height));
  padding-top: calc(48px + var(--nav-height));
}

.hero-premium::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle 500px at 15% 40%, rgba(71,178,228,0.18) 0%, transparent 60%),
    radial-gradient(circle 400px at 85% 30%, rgba(92,124,250,0.14) 0%, transparent 55%),
    radial-gradient(circle 300px at 50% 100%, rgba(55,81,126,0.2) 0%, transparent 50%);
  pointer-events: none;
}

.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(71,178,228,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(71,178,228,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, black, transparent);
  pointer-events: none;
}

.hero-glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  animation: orbPulse 8s ease-in-out infinite;
}

.hero-glow-orb.orb-1 {
  width: 400px;
  height: 400px;
  background: rgba(71,178,228,0.2);
  top: -100px;
  right: 10%;
}

.hero-glow-orb.orb-2 {
  width: 300px;
  height: 300px;
  background: rgba(92,124,250,0.15);
  bottom: 0;
  left: 5%;
  animation-delay: -4s;
}

@keyframes orbPulse {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.1); }
}

.hero-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
  position: relative;
  z-index: 1;
  width: 100%;
}

.hero-content { text-align: left; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(71,178,228,0.12);
  border: 1px solid rgba(71,178,228,0.3);
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
  box-shadow: 0 0 24px rgba(71,178,228,0.1);
}

.hero-badge i { color: #fbbf24; }

.hero-premium h1 {
  font-family: var(--platform-heading);
  font-size: clamp(2.4rem, 5.5vw, 3.8rem);
  font-weight: 800;
  margin: 0 0 22px;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.hero-premium h1 .highlight {
  background: var(--grad-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-premium .hero-desc {
  font-size: 1.12rem;
  opacity: 0.78;
  line-height: 1.7;
  margin: 0 0 28px;
  max-width: 520px;
}

/* Hero search bar */
.hero-premium .hero-search {
  position: relative;
  max-width: 520px;
  width: 100%;
  margin: 0 0 20px;
}

.hero-premium .hero-search input {
  width: 100%;
  display: block;
  padding: 14px 20px 14px 48px;
  border: none;
  border-radius: 999px;
  font-size: 1rem;
  font-family: inherit;
  background: rgba(255,255,255,0.95);
  color: #1e293b;
  box-shadow: 0 8px 32px rgba(0,0,0,0.25);
  outline: none;
}

.hero-premium .hero-search input:focus {
  box-shadow: 0 8px 32px rgba(0,0,0,0.25), 0 0 0 3px rgba(71,178,228,0.35);
}

.hero-premium .hero-search i {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: #64748b;
  font-size: 1.1rem;
  pointer-events: none;
  z-index: 1;
}

/* Hero CTA buttons */
.hero-premium .hero-cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

.hero-premium .btn-hero {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  font-family: inherit;
  text-decoration: none !important;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
  cursor: pointer;
  white-space: nowrap;
}

.hero-premium .btn-hero-primary {
  background: var(--grad-brand);
  color: #fff !important;
  border: none;
  box-shadow: 0 4px 20px rgba(71,178,228,0.4);
}

.hero-premium .btn-hero-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(71,178,228,0.5);
  color: #fff !important;
}

.hero-premium .btn-hero-outline {
  background: rgba(255,255,255,0.08);
  color: #fff !important;
  border: 2px solid rgba(255,255,255,0.45);
}

.hero-premium .btn-hero-outline:hover {
  background: rgba(255,255,255,0.15);
  color: #fff !important;
  border-color: rgba(255,255,255,0.7);
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-brand-showcase {
  position: relative;
  width: 100%;
  max-width: 420px;
}

.hero-brand-glow {
  position: absolute;
  inset: -20%;
  background: radial-gradient(circle, rgba(71,178,228,0.25) 0%, transparent 65%);
  pointer-events: none;
}

.hero-brand-mark {
  width: 100%;
  max-width: 320px;
  margin: 0 auto;
  display: block;
  filter: drop-shadow(0 0 40px rgba(71,178,228,0.35));
  animation: markFloat 6s ease-in-out infinite;
  position: relative;
  z-index: 2;
}

@keyframes markFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.hero-glass-card {
  position: absolute;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  backdrop-filter: blur(16px);
  border-radius: var(--platform-radius);
  padding: 14px 18px;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 3;
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.hero-glass-card.card-1 {
  top: -10px;
  right: -20px;
  animation: float 5s ease-in-out infinite;
}

.hero-glass-card.card-2 {
  bottom: 20px;
  left: -30px;
  animation: float 5s ease-in-out infinite 2s;
}

.hero-glass-card i { font-size: 1.1rem; }

.hero-glass-card.card-1 i { color: #10b981; }
.hero-glass-card.card-2 i { color: var(--platform-blue); }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* Partners marquee */
.partners-marquee {
  padding: 40px 0;
  background: #06080b;
  border-top: 1px solid rgba(255,255,255,0.05);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  overflow: hidden;
}

.partners-label {
  text-align: center;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: rgba(255,255,255,0.35);
  margin: 0 0 24px;
  font-weight: 600;
}

.partners-track-wrap {
  overflow: hidden;
  mask-image: linear-gradient(90deg, transparent, black 10%, black 90%, transparent);
}

.partners-track {
  display: flex;
  align-items: center;
  gap: 64px;
  width: max-content;
  animation: partnerScroll 28s linear infinite;
}

.partners-track img {
  height: 40px;
  width: auto;
  opacity: 0.45;
  filter: grayscale(1) brightness(1.8);
  transition: opacity 0.3s;
}

.partners-track img:hover { opacity: 0.8; }

@keyframes partnerScroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}
  background: var(--grad-hero);
  color: var(--platform-white);
  padding: 80px 24px 100px;
  text-align: center;
}

.platform-hero {
  background: var(--grad-hero);
  color: var(--platform-white);
  padding: 80px 24px 100px;
  text-align: center;
}

.platform-hero h1 {
  font-family: var(--platform-heading);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  margin: 0 0 16px;
  line-height: 1.2;
}

.platform-hero p {
  font-size: 1.2rem;
  opacity: 0.9;
  max-width: 640px;
  margin: 0 auto 32px;
}

.platform-hero .hero-search {
  max-width: 600px;
  margin: 0 auto;
  position: relative;
}

.platform-hero .hero-search input {
  width: 100%;
  padding: 16px 24px 16px 48px;
  border: none;
  border-radius: 999px;
  font-size: 1rem;
  box-shadow: var(--platform-shadow);
}

.platform-hero .hero-search i {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--platform-gray);
  font-size: 1.2rem;
}

.platform-hero .hero-cta {
  margin-top: 24px;
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.platform-hero .btn-hero {
  padding: 14px 32px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  transition: transform 0.2s, background 0.2s, box-shadow 0.2s;
  display: inline-block;
}

.platform-hero .btn-hero-primary {
  background: var(--grad-brand);
  color: var(--platform-white);
  box-shadow: 0 4px 20px rgba(71,178,228,0.4);
}

.platform-hero .btn-hero-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(71,178,228,0.5);
  color: var(--platform-white);
}

.platform-hero .btn-hero-outline {
  background: transparent;
  color: var(--platform-white);
  border: 2px solid var(--platform-white);
}

.platform-hero .btn-hero-outline:hover {
  background: rgba(255,255,255,0.1);
  color: var(--platform-white);
}

/* ===== Sections ===== */
.platform-section {
  padding: 48px 24px;
  max-width: 1280px;
  margin: 0 auto;
}

.platform-section.bg-gray { background: var(--platform-gray-light); }

.platform-section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 12px;
}

.platform-section-header h2 {
  font-family: var(--platform-heading);
  font-size: 1.6rem;
  font-weight: 700;
  margin: 0;
}

.platform-section-header a {
  color: var(--platform-blue);
  font-weight: 600;
  text-decoration: none;
}

/* Category pills */
.category-pills {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.category-pill {
  padding: 8px 20px;
  border: 1px solid var(--platform-border);
  border-radius: 999px;
  background: var(--platform-white);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  color: var(--platform-navy);
}

.category-pill:hover, .category-pill.active {
  background: var(--grad-brand);
  color: var(--platform-white);
  border-color: transparent;
  box-shadow: 0 4px 14px rgba(71,178,228,0.3);
}

/* Category feature cards */
.category-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

.category-card {
  background: var(--platform-white);
  border: 1px solid var(--platform-border-light);
  border-radius: var(--platform-radius);
  padding: 32px 24px;
  text-align: center;
  cursor: pointer;
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--grad-brand);
  opacity: 0;
  transition: opacity 0.3s;
}

.category-card:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 20px 48px rgba(71,178,228,0.18);
  border-color: transparent;
}

.category-card:hover::before { opacity: 0.04; }

.category-card > * { position: relative; z-index: 1; }

.category-card-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.5rem;
  color: var(--platform-white);
}

.category-card-icon.tech { background: var(--grad-tech); }
.category-card-icon.business { background: var(--grad-business); }
.category-card-icon.life { background: var(--grad-life); }
.category-card-icon.all { background: var(--grad-brand); }

.category-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 6px;
}

.category-card p {
  font-size: 0.85rem;
  color: var(--platform-gray);
  margin: 0;
}

/* ===== Course Cards ===== */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
}

.course-card {
  background: var(--platform-white);
  border: 1px solid var(--platform-border-light);
  border-radius: var(--platform-radius);
  overflow: hidden;
  transition: box-shadow 0.35s, transform 0.35s, border-color 0.35s;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
}

.course-card:hover {
  box-shadow: var(--platform-shadow-lg);
  transform: translateY(-8px);
  border-color: rgba(71,178,228,0.3);
}

.course-card-img-wrap {
  position: relative;
  height: 168px;
  overflow: hidden;
}

.course-card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s;
}

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

.course-card-img-fallback {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: rgba(255,255,255,0.9);
}

.course-card-img-fallback.tech { background: var(--grad-tech); }
.course-card-img-fallback.business { background: var(--grad-business); }
.course-card-img-fallback.life { background: var(--grad-life); }

.course-card-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(255,255,255,0.95);
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--platform-blue-deep);
}

.course-card-body {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.course-card-partner {
  font-size: 0.75rem;
  color: var(--platform-gray);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.course-card-title {
  font-family: var(--platform-heading);
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 8px;
  line-height: 1.3;
}

.course-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--platform-gray);
  margin-top: auto;
  padding-top: 12px;
}

.course-card-rating {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--platform-warning);
  font-weight: 700;
}

.course-card-rating span { color: var(--platform-navy); }

.course-card-badge {
  display: inline-block;
  padding: 2px 8px;
  background: var(--platform-blue-light);
  color: var(--platform-blue);
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: var(--platform-radius);
  margin-bottom: 8px;
}

.course-card-level {
  font-size: 0.8rem;
  color: var(--platform-gray);
  display: flex;
  align-items: center;
  gap: 6px;
}

.course-card-level i {
  color: var(--platform-blue);
  font-size: 0.9rem;
}

.course-card-level-badge,
.course-detail-level-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.course-card-level-badge {
  position: absolute;
  bottom: 10px;
  left: 10px;
  z-index: 2;
}

.course-detail-level-badge {
  margin-bottom: 12px;
}

.level-beginner {
  background: #d1fae5;
  color: #065f46;
}

.level-intermediate {
  background: #fef3c7;
  color: #92400e;
}

.level-professional {
  background: #ede9fe;
  color: #5b21b6;
}

/* ===== Stats bar ===== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  background: rgba(12, 15, 20, 0.95);
  border: 1px solid rgba(71,178,228,0.15);
  max-width: 1000px;
  margin: -56px auto 56px;
  padding: 0;
  position: relative;
  z-index: 2;
  border-radius: var(--platform-radius);
  box-shadow: 0 24px 64px rgba(0,0,0,0.35), 0 0 0 1px rgba(255,255,255,0.05);
  overflow: hidden;
  backdrop-filter: blur(12px);
}

.stats-bar > div {
  padding: 28px 20px;
  text-align: center;
  border-right: 1px solid rgba(255,255,255,0.06);
}

.stats-bar > div:last-child { border-right: none; }

.stats-bar .stat-num {
  font-size: 2rem;
  font-weight: 800;
  display: block;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stats-bar .stat-label {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.45);
  font-weight: 500;
}

/* ===== Course Detail Page ===== */
.course-detail-hero {
  background: var(--grad-hero);
  color: var(--platform-white);
  padding: 48px max(20px, 4vw) 72px;
  margin-top: -72px;
  padding-top: calc(48px + 72px);
  position: relative;
}

.course-detail-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 80% at 80% 20%, rgba(71,178,228,0.15), transparent);
  pointer-events: none;
}

.course-detail-hero .breadcrumb {
  font-size: 0.85rem;
  margin-bottom: 16px;
  opacity: 0.8;
}

.course-detail-hero .breadcrumb a {
  color: var(--platform-white);
  text-decoration: none;
}

.course-detail-hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  margin: 0 0 12px;
  max-width: 720px;
}

.course-detail-hero .course-subtitle {
  font-size: 1.1rem;
  opacity: 0.9;
  max-width: 680px;
  margin-bottom: 20px;
}

.course-detail-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 0.9rem;
  margin-bottom: 16px;
}

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

.course-detail-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 32px;
  max-width: 1280px;
  margin: -40px auto 0;
  padding: 0 24px 60px;
  position: relative;
}

.course-detail-main { min-width: 0; }

.course-detail-sidebar {
  position: sticky;
  top: 80px;
  height: fit-content;
}

.enroll-card {
  background: var(--platform-white);
  border: 1px solid var(--platform-border);
  box-shadow: var(--platform-shadow);
  border-radius: var(--platform-radius);
  overflow: hidden;
}

.enroll-card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.enroll-card-body { padding: 24px; }

.enroll-card .btn-enroll {
  display: block;
  width: 100%;
  padding: 16px;
  background: var(--grad-brand);
  color: var(--platform-white);
  border: none;
  border-radius: var(--platform-radius-sm);
  font-size: 1rem;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 16px rgba(71,178,228,0.35);
}

.enroll-card .btn-enroll:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(71,178,228,0.45);
  color: var(--platform-white);
}

.enroll-features {
  list-style: none;
  padding: 0;
  margin: 20px 0 0;
}

.enroll-features li {
  padding: 8px 0;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--platform-gray-light);
}

.detail-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--platform-border);
  margin-bottom: 24px;
}

.detail-tab {
  padding: 12px 24px;
  background: none;
  border: none;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--platform-gray);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -1px;
}

.detail-tab.active {
  color: var(--platform-navy);
  border-bottom-color: var(--platform-navy);
}

.syllabus-module {
  border: 1px solid var(--platform-border);
  border-radius: var(--platform-radius);
  margin-bottom: 12px;
  overflow: hidden;
}

.syllabus-module-header {
  padding: 16px 20px;
  background: var(--platform-gray-light);
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.syllabus-module-header:hover { background: #eee; }

.syllabus-lessons {
  padding: 0;
  list-style: none;
  margin: 0;
}

.syllabus-lessons li {
  padding: 12px 20px 12px 40px;
  border-top: 1px solid var(--platform-border);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.syllabus-lessons li i { color: var(--platform-gray); }

.syllabus-exam-badge {
  background: #fff3cd;
  color: #856404;
  padding: 2px 8px;
  border-radius: var(--platform-radius);
  font-size: 0.75rem;
  font-weight: 700;
  margin-left: auto;
}

/* Learn page topbar — classic light header */
body.learn-page { padding-top: 0; }

.learn-topbar {
  height: 64px;
  background: #fff;
  border-bottom: 1px solid #e5e7eb;
  display: flex;
  align-items: center;
  padding: 0 max(20px, 4vw);
  gap: 16px;
  box-shadow: 0 2px 12px rgba(40, 58, 90, 0.04);
  position: sticky;
  top: 0;
  z-index: 100;
}

.learn-topbar .nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.learn-topbar .nav-logo-icon { border-radius: 10px; }

.learn-wordmark {
  height: 36px;
  mix-blend-mode: normal !important;
  filter: none;
}

.learn-topbar-links {
  margin-left: auto;
  display: flex;
  gap: 8px;
}

.learn-topbar-links a {
  font-size: 0.88rem;
  font-weight: 600;
  color: #37517e;
  padding: 8px 16px;
  border-radius: 50px;
  text-decoration: none;
  transition: all 0.2s;
}

.learn-topbar-links a:hover {
  background: #e8f4fc;
  color: #47b2e4;
}

/* ===== Learn / Player Page — Classic Aetheria light theme ===== */
.learn-layout {
  display: flex;
  min-height: calc(100vh - 64px);
  background: #f7f9fa;
}

.learn-sidebar {
  width: 320px;
  background: #fff;
  color: #37517e;
  overflow-y: auto;
  flex-shrink: 0;
  border-right: 1px solid #e5e7eb;
  box-shadow: 2px 0 16px rgba(40, 58, 90, 0.04);
}

.learn-sidebar-header {
  padding: 24px 20px;
  border-bottom: 1px solid #e5e7eb;
  background: linear-gradient(180deg, #fff 0%, #f8fafc 100%);
}

.learn-sidebar-header .learn-logo-icon {
  border-radius: 10px;
  margin-bottom: 12px;
  display: block;
  box-shadow: 0 4px 12px rgba(71, 178, 228, 0.2);
}

.learn-back-link {
  color: #47b2e4;
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  display: block;
  margin-bottom: 10px;
}

.learn-back-link:hover { color: #209dd8; }

.learn-sidebar-header h2 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 14px;
  line-height: 1.35;
  color: #37517e;
}

.learn-progress {
  background: #e8f4fc;
  border-radius: 999px;
  height: 8px;
  overflow: hidden;
}

.learn-progress-bar {
  background: linear-gradient(90deg, #47b2e4, #209dd8);
  height: 100%;
  transition: width 0.4s ease;
  border-radius: 999px;
}

.learn-progress-text {
  font-size: 0.8rem;
  color: #6b7280;
  margin-top: 8px;
  font-weight: 600;
}

.learn-modules { padding: 8px 0 24px; }

.learn-module-title {
  padding: 12px 20px 6px;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #94a3b8;
  font-weight: 700;
}

.learn-lesson-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  width: calc(100% - 16px);
  margin: 2px 8px;
  padding: 12px 14px;
  background: #f3f5fa;
  border: none;
  border-radius: 10px;
  color: #37517e;
  font-size: 0.88rem;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 1px 4px rgba(40, 58, 90, 0.03);
}

.learn-lesson-btn span { flex: 1; line-height: 1.3; }

.learn-lesson-btn:hover {
  background: #e3f2fd;
  color: #209dd8;
  transform: translateX(2px);
}

.learn-lesson-btn.active {
  background: linear-gradient(135deg, #47b2e4, #209dd8);
  color: #fff;
  font-weight: 600;
  box-shadow: 0 4px 16px rgba(71, 178, 228, 0.35);
}

.learn-lesson-btn.completed i.lesson-icon { color: #10b981; }
.learn-lesson-btn.active i.lesson-icon { color: #fff; }

.learn-lesson-btn.chapter-quiz-btn {
  background: #fff8e6;
  color: #b45309;
  font-weight: 600;
  border: 1px dashed #fbbf24;
}

.learn-lesson-btn.chapter-quiz-btn.active {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #fff;
  border-color: transparent;
}

.learn-lesson-btn.exam-btn {
  color: #7c3aed;
  background: #f5f3ff;
  font-weight: 700;
  border: 1px solid #ddd6fe;
}

.learn-lesson-btn.exam-btn.active {
  background: linear-gradient(135deg, #7c3aed, #5b21b6);
  color: #fff;
}

.learn-lesson-btn.exam-btn.locked {
  opacity: 0.5;
  cursor: not-allowed;
}

.exam-lock-hint {
  font-size: 0.75rem;
  color: #94a3b8;
  padding: 4px 20px 12px;
  margin: 0;
}

.exam-done-icon { margin-left: auto; color: #10b981 !important; }

.learn-main {
  flex: 1;
  background: #f7f9fa;
  overflow-y: auto;
  padding: 32px 40px 48px;
}

.learn-content-card {
  background: #fff;
  border-radius: 18px;
  box-shadow: 0 4px 32px rgba(40, 58, 90, 0.08);
  padding: 40px 44px;
  max-width: 900px;
  margin: 0 auto;
  animation: lessonFadeIn 0.45s ease;
}

@keyframes lessonFadeIn {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: none; }
}

.lesson-chapter-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: #47b2e4;
  margin-bottom: 8px;
}

.lesson-title-main {
  font-size: 2rem;
  font-weight: 700;
  font-style: italic;
  color: #37517e;
  margin: 0 0 20px;
  font-family: 'Jost', var(--platform-heading);
}

.lesson-intro {
  font-size: 1.05rem;
  line-height: 1.75;
  color: #4b5563;
  margin-bottom: 24px;
}

.lesson-module-tag {
  font-size: 0.82rem;
  font-weight: 600;
  color: #47b2e4;
  margin-bottom: 12px;
}

.learn-content-card h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 32px 0 14px;
  color: #37517e;
  padding-bottom: 8px;
  border-bottom: 2px solid #e8f4fc;
}

.learn-content-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 20px 0 10px;
  color: #37517e;
}

.learn-content-card p, .learn-content-card li {
  line-height: 1.8;
  color: #374151;
}

.learn-content-card ul, .learn-content-card ol {
  margin-bottom: 18px;
  padding-left: 24px;
}

.lesson-objectives li { margin-bottom: 8px; }

.lesson-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 0.92rem;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(40, 58, 90, 0.06);
}

.lesson-table th {
  background: #37517e;
  color: #fff;
  padding: 12px 16px;
  text-align: left;
}

.lesson-table td {
  padding: 12px 16px;
  border-bottom: 1px solid #e5e7eb;
}

.lesson-table tr:nth-child(even) td { background: #f8fafc; }

.content-callout {
  display: flex;
  gap: 14px;
  padding: 18px 20px;
  border-radius: 14px;
  margin: 24px 0;
  font-size: 0.95rem;
  line-height: 1.65;
}

.content-callout i {
  font-size: 1.4rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.content-callout.key {
  background: linear-gradient(135deg, #e8f4fc, #f0f9ff);
  border-left: 4px solid #47b2e4;
  color: #1e3a5f;
}

.content-callout.key i { color: #47b2e4; }

.content-callout.tip {
  background: #f0fdf4;
  border-left: 4px solid #10b981;
  color: #14532d;
}

.content-callout.tip i { color: #10b981; }

.content-callout.warning {
  background: #fff7ed;
  border-left: 4px solid #f59e0b;
  color: #78350f;
}

.content-callout.warning i { color: #f59e0b; }

.content-callout.case {
  background: #faf5ff;
  border-left: 4px solid #8b5cf6;
  color: #4c1d95;
}

.content-callout.case i { color: #8b5cf6; }

.content-code-block pre {
  background: #1e293b;
  color: #e2e8f0;
  border: none;
  border-radius: 12px;
  padding: 20px;
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.6;
}

.learn-content-card pre {
  background: #f6f8fa;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 16px;
  overflow-x: auto;
  font-size: 0.9rem;
}

/* ===== In-chapter quizzes ===== */
.quiz-block {
  margin-top: 40px;
  padding-top: 32px;
  border-top: 3px solid #47b2e4;
  background: linear-gradient(180deg, #f8fcff 0%, #fff 100%);
  border-radius: 16px;
  padding: 28px;
  margin-left: -8px;
  margin-right: -8px;
}

.quiz-block-header {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 24px;
}

.quiz-block-header i {
  font-size: 2rem;
  color: #47b2e4;
}

.quiz-block-header h2 {
  margin: 0 0 6px;
  border: none;
  padding: 0;
  font-size: 1.2rem;
}

.quiz-block-header p {
  margin: 0;
  font-size: 0.88rem;
  color: #6b7280;
}

.quiz-question {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid #e5e7eb;
}

.quiz-question h3 {
  font-size: 0.98rem;
  margin-bottom: 12px;
}

.quiz-option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 16px;
  border: 2px solid #e5e7eb;
  border-radius: 12px;
  margin-bottom: 8px;
  cursor: pointer;
  transition: all 0.2s;
  background: #fff;
}

.quiz-option:hover {
  border-color: #47b2e4;
  background: #f0f9ff;
}

.quiz-option.correct {
  border-color: #10b981;
  background: #d1fae5;
}

.quiz-option.incorrect {
  border-color: #ef4444;
  background: #fee2e2;
}

.quiz-explanation {
  font-size: 0.85rem;
  color: #6b7280;
  margin-top: 8px;
  font-style: italic;
}

.quiz-submit {
  padding: 12px 28px;
  background: linear-gradient(135deg, #47b2e4, #209dd8);
  color: #fff;
  border: none;
  border-radius: 50px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(71, 178, 228, 0.35);
  transition: transform 0.2s;
}

.quiz-submit:hover { transform: translateY(-2px); }

.quiz-result-msg {
  margin-top: 16px;
  padding: 14px 18px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.95rem;
}

.quiz-result-msg.pass {
  background: #d1fae5;
  color: #065f46;
}

.quiz-result-msg.fail {
  background: #fee2e2;
  color: #991b1b;
}

.chapter-quiz-hero {
  text-align: center;
  padding: 24px 0 32px;
  border-bottom: 2px solid #fef3c7;
  margin-bottom: 24px;
}

.chapter-quiz-hero i {
  font-size: 3rem;
  color: #f59e0b;
  margin-bottom: 12px;
}

.chapter-quiz-hero h1 {
  color: #37517e;
  font-style: italic;
  margin-bottom: 12px;
}

.exam-locked-card {
  text-align: center;
  padding: 60px 40px;
}

.exam-locked-card i {
  font-size: 4rem;
  color: #94a3b8;
  margin-bottom: 16px;
}

.syllabus-quiz-tag {
  font-size: 0.72rem;
  background: #e8f4fc;
  color: #209dd8;
  padding: 2px 8px;
  border-radius: 999px;
  margin-left: auto;
  font-weight: 600;
}

.syllabus-chapter-quiz {
  background: #fffbeb !important;
  font-weight: 600;
  color: #b45309;
}

.syllabus-exam-module .syllabus-module-header {
  background: linear-gradient(135deg, #f5f3ff, #ede9fe);
}

.learn-nav-buttons {
  display: flex;
  justify-content: space-between;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid #e5e7eb;
  gap: 12px;
}

.learn-nav-buttons button {
  padding: 12px 24px;
  border-radius: 50px;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid #e5e7eb;
  background: #fff;
  color: #37517e;
  transition: all 0.2s;
}

.learn-nav-buttons button:hover:not(:disabled) {
  border-color: #47b2e4;
  color: #47b2e4;
}

.learn-nav-buttons button.btn-next {
  background: linear-gradient(135deg, #47b2e4, #209dd8);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 14px rgba(71, 178, 228, 0.3);
}

.learn-nav-buttons button.btn-next:hover:not(:disabled) {
  transform: translateY(-2px);
  color: #fff;
}

.learn-nav-buttons button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

/* ===== Exam ===== */
.exam-container { max-width: 800px; }

.exam-header {
  background: linear-gradient(135deg, #e8f4fc, #f0f9ff);
  padding: 24px 28px;
  border-radius: 16px;
  margin-bottom: 28px;
  border: 1px solid #bae6fd;
}

.exam-header-hard {
  background: linear-gradient(135deg, #1e1b4b, #312e81);
  color: #fff;
  border: none;
}

.exam-header-hard p { color: rgba(255,255,255,0.85); }

.exam-hard-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(239, 68, 68, 0.2);
  color: #fca5a5;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.exam-warning {
  margin-top: 12px !important;
  padding: 10px 14px;
  background: rgba(239, 68, 68, 0.15);
  border-radius: 8px;
  color: #fecaca !important;
  font-size: 0.88rem !important;
}

.exam-header h2 { margin: 0 0 8px; font-size: 1.4rem; color: inherit; }

.exam-header p { margin: 0; color: #6b7280; font-size: 0.9rem; }

.exam-question .q-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: #37517e;
  color: #fff;
  border-radius: 8px;
  font-size: 0.85rem;
  margin-right: 8px;
}

.exam-submit-hard {
  background: linear-gradient(135deg, #7c3aed, #5b21b6) !important;
  width: 100%;
  padding: 16px !important;
  font-size: 1.05rem !important;
}

.exam-question {
  margin-bottom: 28px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--platform-border);
}

.exam-question h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 14px;
}

.exam-option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 16px;
  border: 1px solid var(--platform-border);
  border-radius: var(--platform-radius);
  margin-bottom: 8px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.exam-option:hover { border-color: var(--platform-blue); background: var(--platform-blue-light); }

.exam-option.selected { border-color: var(--platform-blue); background: var(--platform-blue-light); }

.exam-option.correct { border-color: var(--platform-success); background: #d4edda; }

.exam-option.incorrect { border-color: #dc3545; background: #f8d7da; }

.exam-option input { margin-top: 3px; }

.exam-submit {
  padding: 14px 32px;
  background: var(--platform-blue);
  color: var(--platform-white);
  border: none;
  border-radius: var(--platform-radius);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
}

.exam-submit:hover { background: var(--platform-blue-dark); }

.exam-results {
  text-align: center;
  padding: 40px;
}

.exam-results .score-circle {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--platform-blue-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 2rem;
  font-weight: 700;
  color: var(--platform-blue);
}

.exam-results.pass .score-circle {
  background: #d4edda;
  color: var(--platform-success);
}

.exam-results.fail .score-circle {
  background: #f8d7da;
  color: #dc3545;
}

/* ===== Catalog filters ===== */
.catalog-toolbar {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 28px;
  align-items: center;
}

.catalog-toolbar select {
  padding: 10px 16px;
  border: 1px solid var(--platform-border-light);
  border-radius: var(--platform-radius-sm);
  font-size: 0.9rem;
  background: var(--platform-white);
}

.catalog-count {
  color: var(--platform-gray);
  font-size: 0.9rem;
  margin-left: auto;
}

/* ===== Footer ===== */
.platform-footer {
  background: #06080b;
  color: rgba(255,255,255,0.65);
  padding: 56px max(20px, 4vw) 28px;
  border-top: 1px solid rgba(71,178,228,0.1);
}

.platform-footer-brand {
  max-width: 1280px;
  margin: 0 auto 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.footer-logo-icon {
  display: block;
  border-radius: 10px;
  margin-bottom: 12px;
}

.footer-brand-name {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 3px;
  color: #fff;
  margin-bottom: 12px;
}

.footer-brand-name span {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 4px;
  color: var(--platform-blue);
  margin-top: 3px;
}

.footer-logo-brand {
  height: 50px;
  width: auto;
  margin-bottom: 16px;
  display: block;
  mix-blend-mode: lighten;
}

.footer-tagline {
  max-width: 400px;
  font-size: 0.92rem;
  line-height: 1.6;
  margin: 0 0 20px;
  opacity: 0.8;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--platform-white);
  text-decoration: none;
  transition: background 0.2s, transform 0.2s;
}

.footer-social a:hover {
  background: var(--platform-blue);
  transform: translateY(-2px);
}

.footer-motto {
  background: var(--grad-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 600;
}

.platform-footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  max-width: 1280px;
  margin: 0 auto 32px;
}

.platform-footer h4 {
  color: var(--platform-white);
  font-size: 0.95rem;
  margin: 0 0 16px;
}

.platform-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.platform-footer ul li { margin-bottom: 8px; }

.platform-footer ul a {
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  font-size: 0.85rem;
}

.platform-footer ul a:hover { color: var(--platform-white); }

.platform-footer-bottom {
  max-width: 1280px;
  margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
}

/* ===== Value props ===== */
.value-props {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  padding: 80px max(20px, 4vw);
  max-width: 1280px;
  margin: 0 auto;
}

.value-prop {
  text-align: left;
  padding: 32px 28px;
  background: var(--platform-white);
  border: 1px solid var(--platform-border-light);
  border-radius: var(--platform-radius);
  transition: box-shadow 0.3s, transform 0.3s, border-color 0.3s;
}

.value-prop:hover {
  box-shadow: 0 16px 40px rgba(71,178,228,0.12);
  transform: translateY(-4px);
  border-color: rgba(71,178,228,0.25);
}

.value-prop-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(71,178,228,0.15), rgba(92,124,250,0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  border: 1px solid rgba(71,178,228,0.2);
}

.value-prop i {
  font-size: 1.5rem;
  color: var(--platform-blue);
  margin-bottom: 0;
}

.value-prop h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0 0 10px;
}

.value-prop p {
  color: var(--platform-gray);
  font-size: 0.92rem;
  margin: 0;
  line-height: 1.6;
}

/* CTA banner */
.cta-banner {
  background: var(--grad-hero);
  color: var(--platform-white);
  padding: 72px max(20px, 4vw);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 50%, rgba(71,178,228,0.2), transparent 60%);
}

.cta-banner-inner {
  position: relative;
  z-index: 1;
  max-width: 640px;
  margin: 0 auto;
}

.cta-banner h2 {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 800;
  margin: 0 0 12px;
}

.cta-banner p {
  opacity: 0.9;
  margin: 0 0 28px;
  font-size: 1.05rem;
}

.cta-banner .btn-hero {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 1rem;
  font-family: inherit;
  text-decoration: none !important;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
  cursor: pointer;
}

.cta-banner .btn-hero-outline {
  background: #fff;
  color: #37517e !important;
  border: none;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
}

.cta-banner .btn-hero-outline:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(71, 178, 228, 0.45);
  color: #209dd8 !important;
  background: #fff;
}

.certification-hidden {
  display: none !important;
}

/* Catalog page header */
.catalog-hero {
  background: var(--grad-hero);
  color: var(--platform-white);
  padding: 48px max(20px, 4vw) 72px;
  margin-top: calc(-1 * var(--nav-height));
  padding-top: calc(48px + var(--nav-height));
  position: relative;
  overflow: hidden;
}

.catalog-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle 400px at 80% 20%, rgba(71,178,228,0.15), transparent);
  pointer-events: none;
}

.catalog-hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  margin: 0 0 10px;
  position: relative;
}

.catalog-hero p {
  opacity: 0.75;
  margin: 0;
  font-size: 1.05rem;
  position: relative;
}

/* Reveal animations */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.revealed {
  opacity: 1;
  transform: none;
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--platform-blue);
  margin-bottom: 8px;
}

.platform-section.bg-gray {
  background: var(--platform-gray-light);
  max-width: none;
  padding-left: max(20px, 4vw);
  padding-right: max(20px, 4vw);
}

.platform-section.bg-gray > .platform-section-inner {
  max-width: 1280px;
  margin: 0 auto;
}

/* ===== Responsive ===== */
@media (max-width: 992px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

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

  .hero-premium .hero-desc { margin-left: auto; margin-right: auto; }

  .hero-premium .hero-search { margin-left: auto; margin-right: auto; }

  .hero-premium .hero-cta { justify-content: center; }

  .hero-visual { display: none; }

  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
    margin: -24px 16px 0;
  }

  .stats-bar > div:nth-child(2) { border-right: none; }

  .stats-bar > div:nth-child(1),
  .stats-bar > div:nth-child(2) { border-bottom: 1px solid var(--platform-border); }

  .course-detail-layout {
    grid-template-columns: 1fr;
  }

  .course-detail-sidebar {
    position: static;
    order: -1;
  }

  .learn-layout { flex-direction: column; }

  .learn-sidebar {
    width: 100%;
    max-height: 280px;
  }

  .learn-main { padding: 20px 16px; }

  .learn-content-card { padding: 24px 20px; }

  .platform-nav .nav-explore { display: none; }

  .platform-nav .nav-search { display: none; }
}

@media (max-width: 768px) {
  .platform-nav .nav-links { display: none; }

  .nav-mobile-toggle { display: block; }

  .platform-nav { padding: 0 16px; height: 64px; }

  body.platform-body { padding-top: 64px; }

  .stats-bar { grid-template-columns: 1fr 1fr; }

  .stats-bar .stat-num { font-size: 1.5rem; }
}