/* ============================================
   EAE UNIVERSITY - COMPONENTS
   Forest & Gold Premium UI
   "숲 속의 비밀 대학"
   ============================================ */

/* ============================================
   CONTAINER
   ============================================ */
.container {
  width: 100%;
  max-width: var(--max-width-7xl);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.container-narrow {
  max-width: var(--max-width-5xl);
}

.container-wide {
  max-width: var(--max-width-full);
}

/* ============================================
   BUTTONS - Forest & Gold
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  line-height: 1;
  text-align: center;
  white-space: nowrap;
  border-radius: var(--radius-lg);
  transition: all var(--duration-300) var(--ease-out);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent, rgba(255,255,255,0.1), transparent);
  opacity: 0;
  transition: opacity var(--duration-200) var(--ease-out);
}

.btn:hover::before {
  opacity: 1;
}

/* Primary Button - Gold */
.btn-primary {
  background: linear-gradient(135deg, var(--color-accent-500), var(--color-accent-600));
  color: var(--color-primary-900);
  box-shadow: 0 4px 20px rgba(245, 197, 66, 0.3);
  font-weight: var(--font-bold);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(245, 197, 66, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
}

/* Secondary Button - Forest */
.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-default);
}

.btn-secondary:hover {
  background: var(--bg-elevated);
  border-color: var(--color-accent-500);
  color: var(--color-accent-400);
}

/* Ghost Button */
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  background: var(--bg-tertiary);
  color: var(--color-accent-400);
}

/* Outline Button - Gold Outline */
.btn-outline {
  background: transparent;
  color: var(--color-accent-400);
  border: 1px solid var(--color-accent-500);
}

.btn-outline:hover {
  background: var(--color-accent-500);
  color: var(--color-primary-900);
  border-color: var(--color-accent-500);
}

/* Button Sizes */
.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
  border-radius: var(--radius-xl);
}

.btn-xl {
  padding: var(--space-5) var(--space-10);
  font-size: var(--text-lg);
  border-radius: var(--radius-xl);
}

/* Icon Button */
.btn-icon {
  padding: var(--space-3);
  border-radius: var(--radius-lg);
}

.btn-icon.btn-sm {
  padding: var(--space-2);
}

.btn-icon.btn-lg {
  padding: var(--space-4);
}

/* ============================================
   CARDS - Forest Glass
   ============================================ */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  transition: all var(--duration-300) var(--ease-out);
}

.card:hover {
  border-color: var(--color-accent-500);
  transform: translateY(-4px);
  box-shadow: var(--shadow-gold);
}

.card-glass {
  background: var(--bg-glass);
  backdrop-filter: blur(var(--blur-lg));
  -webkit-backdrop-filter: blur(var(--blur-lg));
}

.card-interactive {
  cursor: pointer;
}

.card-interactive:hover {
  box-shadow: var(--shadow-glow);
}

/* ============================================
   COURSE CARD
   ============================================ */
.course-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  transition: all var(--duration-300) var(--ease-out);
  cursor: pointer;
}

.course-card:hover {
  border-color: var(--color-accent-500);
  transform: translateY(-8px);
  box-shadow: var(--shadow-glow-lg);
}

.course-card__thumbnail {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.course-card__thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-500) var(--ease-out);
}

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

.course-card__badge {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  z-index: 1;
}

.course-card__play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(8, 12, 8, 0.4);
  opacity: 0;
  transition: opacity var(--duration-300) var(--ease-out);
}

.course-card:hover .course-card__play {
  opacity: 1;
}

.course-card__play-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-accent-500), var(--color-accent-600));
  border-radius: var(--radius-full);
  color: var(--color-primary-900);
  transform: scale(0.8);
  transition: transform var(--duration-300) var(--ease-bounce);
  box-shadow: 0 8px 30px rgba(245, 197, 66, 0.4);
}

.course-card:hover .course-card__play-icon {
  transform: scale(1);
}

.course-card__body {
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.course-card__category {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-accent-500);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
}

.course-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  line-height: var(--leading-snug);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.course-card__meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.course-card__progress {
  margin-top: auto;
  padding-top: var(--space-3);
}

.course-card__progress-bar {
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.course-card__progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary-500), var(--color-accent-500));
  border-radius: var(--radius-full);
  transition: width var(--duration-500) var(--ease-out);
}

.course-card__progress-text {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  text-align: right;
}

/* ============================================
   BADGES - Forest & Gold
   ============================================ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.badge-primary {
  background: linear-gradient(135deg, var(--color-accent-500), var(--color-accent-600));
  color: var(--color-primary-900);
}

.badge-secondary {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.badge-success {
  background: rgba(34, 197, 94, 0.2);
  color: var(--color-success);
}

.badge-warning {
  background: rgba(245, 197, 66, 0.2);
  color: var(--color-accent-500);
}

.badge-free {
  background: linear-gradient(135deg, var(--color-success), #059669);
  color: white;
}

.badge-premium {
  background: linear-gradient(135deg, var(--color-accent-500), var(--color-accent-700));
  color: var(--color-primary-900);
  font-weight: var(--font-bold);
}

.badge-new {
  background: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-600));
  color: white;
}

/* ============================================
   NAVIGATION - Forest Glass
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  padding: var(--space-4) 0;
  transition: all var(--duration-300) var(--ease-out);
}

.nav.is-scrolled {
  background: var(--bg-glass);
  backdrop-filter: blur(var(--blur-lg));
  -webkit-backdrop-filter: blur(var(--blur-lg));
  border-bottom: 1px solid var(--border-subtle);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
}

.nav__logo-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary-600), var(--color-accent-600));
  border-radius: var(--radius-lg);
  color: white;
  font-weight: var(--font-extrabold);
  box-shadow: 0 4px 12px rgba(245, 197, 66, 0.2);
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav__link {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
  border-radius: var(--radius-lg);
  transition: all var(--duration-200) var(--ease-out);
}

.nav__link:hover,
.nav__link.is-active {
  color: var(--color-accent-400);
  background: rgba(245, 197, 66, 0.1);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Mobile Nav Toggle */
.nav__toggle {
  display: none;
  padding: var(--space-2);
  color: var(--text-primary);
}

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

  .nav__toggle {
    display: flex;
  }
}

/* ============================================
   HERO SECTION - Forest Atmosphere
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--space-32) 0 var(--space-20);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero__gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(26, 77, 46, 0.4), transparent),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(245, 197, 66, 0.1), transparent),
    radial-gradient(ellipse 50% 30% at 20% 80%, rgba(26, 92, 56, 0.15), transparent);
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(245, 197, 66, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 197, 66, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black, transparent);
}

.hero__content {
  text-align: center;
  max-width: var(--max-width-4xl);
  margin-inline: auto;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  margin-bottom: var(--space-6);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-accent-400);
  background: rgba(245, 197, 66, 0.1);
  border: 1px solid rgba(245, 197, 66, 0.25);
  border-radius: var(--radius-full);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-6xl);
  font-weight: var(--font-extrabold);
  line-height: var(--leading-none);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-6);
}

.hero__subtitle {
  font-size: var(--text-xl);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  max-width: var(--max-width-2xl);
  margin-inline: auto;
  margin-bottom: var(--space-10);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
}

.hero__stats {
  display: flex;
  justify-content: center;
  gap: var(--space-12);
  margin-top: var(--space-16);
  padding-top: var(--space-12);
  border-top: 1px solid var(--border-subtle);
}

.hero__stat {
  text-align: center;
}

.hero__stat-value {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
}

.hero__stat-label {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  margin-top: var(--space-1);
}

/* ============================================
   SECTION
   ============================================ */
.section {
  padding: var(--space-24) 0;
}

.section-header {
  text-align: center;
  max-width: var(--max-width-3xl);
  margin-inline: auto;
  margin-bottom: var(--space-12);
}

.section-label {
  display: inline-flex;
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-accent-500);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  margin-bottom: var(--space-4);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  margin-top: var(--space-4);
}

/* ============================================
   COURSE GRID
   ============================================ */
.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-6);
}

@media (max-width: 640px) {
  .course-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   FEATURE CARDS - Forest Style
   ============================================ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

.feature-card {
  padding: var(--space-8);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-2xl);
  transition: all var(--duration-300) var(--ease-out);
}

.feature-card:hover {
  border-color: var(--color-accent-500);
  box-shadow: var(--shadow-glow);
}

.feature-card__icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
  background: linear-gradient(135deg, rgba(26, 77, 46, 0.3), rgba(245, 197, 66, 0.15));
  border-radius: var(--radius-xl);
  color: var(--color-accent-500);
  border: 1px solid rgba(245, 197, 66, 0.1);
}

.feature-card__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-3);
}

.feature-card__description {
  font-size: var(--text-base);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

/* ============================================
   FOOTER - Forest Floor
   ============================================ */
.footer {
  padding: var(--space-16) 0 var(--space-8);
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

@media (max-width: 768px) {
  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
}

.footer__brand {
  max-width: 300px;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  margin-bottom: var(--space-4);
}

.footer__description {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

.footer__column-title {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__link {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  transition: color var(--duration-200) var(--ease-out);
}

.footer__link:hover {
  color: var(--color-accent-400);
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-8);
  border-top: 1px solid var(--border-subtle);
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

.footer__social {
  display: flex;
  gap: var(--space-4);
}

.footer__social-link {
  color: var(--text-secondary);
  transition: color var(--duration-200) var(--ease-out);
}

.footer__social-link:hover {
  color: var(--color-accent-400);
}

/* ============================================
   UTILITIES
   ============================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }