/* ==========================================================================
   LearnToday Sections Design System
   Creative Bento Grid Layout + Advanced Section Components
   ========================================================================== */

/* ==========================================================================
   🎨 Hero Section Variants
   ========================================================================== */

.hero {
  position: relative;
  min-height: min(90vh, 800px);
  padding: var(--space-32) 0 var(--space-24);
  background: var(--gradient-hero-creative);
  overflow: hidden;
  display: flex;
  align-items: center;
}

.hero::before {
  content: '';
  position: absolute;
  inset: -30%;
  background:
    radial-gradient(1000px 600px at 70% 10%, rgba(0, 217, 255, 0.1), transparent),
    radial-gradient(800px 500px at 30% -10%, rgba(255, 107, 107, 0.08), transparent);
  filter: blur(60px);
  pointer-events: none;
  animation: float 20s ease-in-out infinite;
}

.hero-container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-12);
  align-items: center;
}

/* Hero 섹션이 단일 컬럼인 경우 중앙 정렬 */
.hero-container:has(.hero-content:only-child) {
  grid-template-columns: 1fr;
  justify-items: center;
}

.hero-container:has(.hero-content:only-child) .hero-content {
  text-align: center;
}

.hero-content {
  max-width: 640px;
  text-align: center;
  margin: 0 auto;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: rgba(255, 107, 107, 0.1);
  color: var(--color-passion-700);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
  backdrop-filter: blur(10px);
}

.hero h1 {
  font-size: var(--text-6xl);
  font-weight: var(--font-black);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tighter);
  color: var(--text-primary);
  margin-bottom: var(--space-6);
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--color-trust-700) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p.lead {
  font-size: var(--text-xl);
  line-height: var(--leading-loose);
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  justify-content: center;
}

.hero-media {
  position: relative;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-3xl);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.05));
  backdrop-filter: blur(20px);
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(800px 300px at 30% 0%, rgba(255, 255, 255, 0.1), transparent);
  pointer-events: none;
}

.hero-media img,
.hero-media video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Hero Minimal Variant */
.hero-minimal {
  padding: var(--space-24) 0;
  background: transparent;
  text-align: center;
}

.hero-minimal .hero-container {
  grid-template-columns: 1fr;
  max-width: 800px;
  margin: 0 auto;
}

.hero-minimal .hero-content {
  max-width: 100%;
}

/* ==========================================================================
   📊 Bento Grid System - Asymmetric Creative Layouts
   ========================================================================== */

.bento-grid {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: repeat(12, 1fr);
  grid-auto-rows: minmax(200px, auto);
}

/* Bento Grid Item Sizes */
.bento-item-1x1 {
  grid-column: span 4;
  grid-row: span 1;
}

.bento-item-1x2 {
  grid-column: span 4;
  grid-row: span 2;
}

.bento-item-2x1 {
  grid-column: span 8;
  grid-row: span 1;
}

.bento-item-2x2 {
  grid-column: span 8;
  grid-row: span 2;
}

.bento-item-3x1 {
  grid-column: span 12;
  grid-row: span 1;
}

.bento-item-3x2 {
  grid-column: span 12;
  grid-row: span 2;
}

.bento-item-featured {
  grid-column: span 6;
  grid-row: span 2;
}

.bento-item-small {
  grid-column: span 3;
  grid-row: span 1;
}

.bento-item-tall {
  grid-column: span 4;
  grid-row: span 3;
}

/* Bento Item Styling */
.bento-item {
  position: relative;
  background: var(--bg-primary);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-2xl);
  padding: var(--space-6);
  overflow: hidden;
  transition: all var(--transition-bounce);
  display: flex;
  flex-direction: column;
}

.bento-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2xl);
  border-color: var(--color-passion-300);
}

.bento-item-glass {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  border: var(--border-width) solid var(--glass-border);
}

.bento-item-gradient {
  background: var(--gradient-surface);
  border: none;
}

.bento-item-passion {
  background: var(--gradient-passion);
  color: var(--text-inverse);
  border: none;
}

.bento-item-trust {
  background: var(--gradient-trust);
  color: var(--text-inverse);
  border: none;
}

.bento-item-innovation {
  background: var(--gradient-innovation);
  border: none;
}

/* ==========================================================================
   🎴 Feature Cards & Product Showcases
   ========================================================================== */

.features-section {
  padding: var(--space-32) 0;
  background: var(--gradient-hero-cool);
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto var(--space-16);
}

.section-eyebrow {
  display: inline-block;
  font-size: var(--text-sm);
  font-weight: var(--font-bold);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-innovation-600);
  background: var(--color-innovation-100);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

.section-title {
  font-size: var(--text-5xl);
  font-weight: var(--font-extrabold);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
  line-height: var(--leading-tight);
}

.section-description {
  font-size: var(--text-lg);
  color: var(--text-tertiary);
  line-height: var(--leading-loose);
  max-width: 700px;
  margin: 0 auto;
}

/* Feature Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-8);
}

.feature-card {
  position: relative;
  background: var(--bg-primary);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: all var(--transition-bounce);
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-passion);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-2xl);
  border-color: var(--color-passion-300);
}

.feature-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-passion);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
  font-size: var(--text-3xl);
  box-shadow: var(--shadow-passion);
}

.feature-card h3 {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}

.feature-card p {
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-4);
}

.feature-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-passion-600);
  font-weight: var(--font-semibold);
  text-decoration: none;
  transition: gap var(--transition-base);
}

.feature-link:hover {
  gap: var(--space-3);
}

/* ==========================================================================
   📈 Stats Section - Animated Counters
   ========================================================================== */

.stats-section {
  padding: var(--space-24) 0;
  background: var(--gradient-hero-warm);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-8);
}

.stat-card {
  text-align: center;
  padding: var(--space-6);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  border: var(--border-width) solid var(--glass-border);
  border-radius: var(--radius-xl);
  transition: all var(--transition-bounce);
}

.stat-card:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: var(--shadow-xl);
}

.stat-number {
  font-size: var(--text-6xl);
  font-weight: var(--font-black);
  background: var(--gradient-passion);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-2);
  line-height: 1;
}

.stat-label {
  font-size: var(--text-base);
  color: var(--text-tertiary);
  font-weight: var(--font-medium);
}

/* ==========================================================================
   🎯 CTA Sections
   ========================================================================== */

.cta-section {
  position: relative;
  padding: var(--space-32) 0;
  background: var(--gradient-hero-creative);
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  inset: -20%;
  background:
    radial-gradient(1000px 600px at 50% 50%, rgba(74, 95, 230, 0.15), transparent);
  filter: blur(80px);
  pointer-events: none;
}

.cta-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.cta-section h2 {
  font-size: var(--text-5xl);
  font-weight: var(--font-extrabold);
  color: var(--text-primary);
  margin-bottom: var(--space-6);
  line-height: var(--leading-tight);
  white-space: nowrap;
}

.cta-section p {
  font-size: var(--text-xl);
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
  line-height: var(--leading-loose);
}

.cta-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* ==========================================================================
   💬 Testimonials Section
   ========================================================================== */

.testimonials-section {
  padding: var(--space-32) 0;
  background: var(--bg-secondary);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-8);
}

.testimonial-card {
  position: relative;
  background: var(--bg-primary);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: all var(--transition-bounce);
}

.testimonial-card::before {
  content: '"';
  position: absolute;
  top: var(--space-4);
  left: var(--space-4);
  font-size: 80px;
  font-weight: var(--font-black);
  color: var(--color-passion-200);
  line-height: 1;
  opacity: 0.5;
}

.testimonial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-passion-300);
}

.testimonial-content {
  position: relative;
  z-index: 1;
  margin-bottom: var(--space-6);
  font-size: var(--text-lg);
  line-height: var(--leading-loose);
  color: var(--text-secondary);
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.author-avatar {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  object-fit: cover;
  border: 3px solid var(--color-passion-200);
}

.author-info h4 {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.author-info p {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

/* ==========================================================================
   🏢 Partners / Logo Cloud
   ========================================================================== */

.partners-section {
  padding: var(--space-20) 0;
  background: transparent;
}

.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-8);
  align-items: center;
  justify-items: center;
}

.partner-logo {
  width: 100%;
  max-width: 160px;
  height: 60px;
  object-fit: contain;
  filter: grayscale(100%) opacity(0.6);
  transition: all var(--transition-base);
}

.partner-logo:hover {
  filter: grayscale(0%) opacity(1);
  transform: scale(1.1);
}

/* ==========================================================================
   📱 Product Carousel
   ========================================================================== */

.product-carousel {
  position: relative;
  padding: var(--space-32) 0;
  background: var(--gradient-hero-cool);
  overflow: hidden;
}

.carousel-container {
  display: flex;
  gap: var(--space-6);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding-bottom: var(--space-4);
}

.carousel-container::-webkit-scrollbar {
  display: none;
}

.product-slide {
  flex: 0 0 calc(33.333% - var(--space-4));
  min-width: 400px;
  scroll-snap-align: start;
  background: var(--bg-primary);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  transition: all var(--transition-bounce);
}

.product-slide:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-2xl);
  border-color: var(--color-trust-400);
}

.product-image {
  width: 100%;
  height: 240px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-6);
  background: var(--bg-tertiary);
}

.product-slide h3 {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}

.product-slide p {
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-6);
}

/* ==========================================================================
   📱 Responsive Design
   ========================================================================== */

@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .hero h1 {
    font-size: var(--text-5xl);
  }

  .bento-grid {
    grid-template-columns: repeat(6, 1fr);
  }

  .bento-item-1x1,
  .bento-item-1x2 {
    grid-column: span 6;
  }

  .bento-item-2x1,
  .bento-item-2x2 {
    grid-column: span 6;
  }

  .bento-item-featured {
    grid-column: span 6;
  }

  .bento-item-small {
    grid-column: span 3;
  }

  .product-slide {
    flex: 0 0 calc(50% - var(--space-3));
    min-width: 320px;
  }
}

@media (max-width: 768px) {
  .hero {
    min-height: auto;
    padding: var(--space-20) 0 var(--space-16);
  }

  .hero h1 {
    font-size: var(--text-4xl);
  }

  .hero p.lead {
    font-size: var(--text-lg);
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .bento-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .bento-item-1x1,
  .bento-item-1x2,
  .bento-item-2x1,
  .bento-item-2x2,
  .bento-item-3x1,
  .bento-item-3x2,
  .bento-item-featured,
  .bento-item-small,
  .bento-item-tall {
    grid-column: span 1;
    grid-row: span 1;
  }

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

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
  }

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

  .partners-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
  }

  .product-slide {
    flex: 0 0 85%;
    min-width: 280px;
  }

  .section-title {
    font-size: var(--text-3xl);
  }

  .cta-section h2 {
    font-size: var(--text-3xl);
  }
}

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

  .partners-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ==========================================================================
   ✨ Special Effects
   ========================================================================== */

.diagonal-section {
  clip-path: polygon(0 5%, 100% 0, 100% 95%, 0 100%);
  margin-top: -5vh;
  padding-top: 10vh;
  padding-bottom: 10vh;
}

.wave-section::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 100px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 120' preserveAspectRatio='none'%3E%3Cpath d='M321.39,56.44c58-10.79,114.16-30.13,172-41.86,82.39-16.72,168.19-17.73,250.45-.39C823.78,31,906.67,72,985.66,92.83c70.05,18.48,146.53,26.09,214.34,3V0H0V27.35A600.21,600.21,0,0,0,321.39,56.44Z' fill='%23ffffff'/%3E%3C/svg%3E") no-repeat;
  background-size: cover;
}