/* ===== Reset & Base ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #4338ca;
  --primary-light: #6366f1;
  --primary-dark: #3730a3;
  --accent: #2563eb;
  --text: #1e293b;
  --text-light: #64748b;
  --text-lighter: #94a3b8;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --bg-dark: #0f172a;
  --border: #e2e8f0;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.08), 0 6px 10px rgba(0,0,0,0.05);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.3s;
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--primary);
}

.nav-logo span {
  font-weight: 400;
  color: var(--text-light);
  font-size: 0.9rem;
  margin-left: 4px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  padding: 8px 16px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-light);
  border-radius: var(--radius-sm);
  transition: color 0.2s, background 0.2s;
}

.nav-link:hover {
  color: var(--primary);
  background: rgba(67, 56, 202, 0.06);
}

.nav-cta {
  background: var(--primary);
  color: #fff !important;
  margin-left: 8px;
}

.nav-cta:hover {
  background: var(--primary-dark) !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  overflow: hidden;
  background: linear-gradient(135deg, #f0f0ff 0%, #e8eaff 30%, #f8fafc 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-label {
  display: inline-block;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--primary);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 16px;
  padding: 6px 20px;
  background: rgba(67, 56, 202, 0.08);
  border-radius: 100px;
}

.hero-title {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 900;
  color: var(--text);
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: -2px;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  color: var(--text-light);
  line-height: 1.8;
  max-width: 600px;
  margin: 0 auto 40px;
  font-weight: 300;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-decoration {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.hero-shape {
  position: absolute;
  border-radius: 50%;
  opacity: 0.12;
}

.hero-shape-1 {
  width: 500px;
  height: 500px;
  background: var(--primary);
  top: -150px;
  right: -100px;
  animation: float 8s ease-in-out infinite;
}

.hero-shape-2 {
  width: 300px;
  height: 300px;
  background: var(--accent);
  bottom: -50px;
  left: -80px;
  animation: float 10s ease-in-out infinite reverse;
}

.hero-shape-3 {
  width: 200px;
  height: 200px;
  background: var(--primary-light);
  top: 40%;
  left: 15%;
  animation: float 6s ease-in-out infinite 2s;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-30px) rotate(5deg); }
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius);
  transition: all 0.25s;
  cursor: pointer;
  border: none;
  font-family: inherit;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(67, 56, 202, 0.3);
}

.btn-primary:hover {
  background: var(--primary-dark);
  box-shadow: 0 6px 20px rgba(67, 56, 202, 0.4);
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 18px 42px;
  font-size: 1.1rem;
}

/* ===== Section Common ===== */
.section {
  padding: 100px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-label {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 900;
  color: var(--text);
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-light);
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.about-lead {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--text);
  line-height: 1.8;
  margin-bottom: 20px;
}

.about-text {
  font-size: 1rem;
  color: var(--text-light);
  line-height: 1.9;
  margin-bottom: 16px;
}

.about-stats {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.stat-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
  display: flex;
  align-items: center;
  gap: 20px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.stat-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.stat-number {
  font-size: 2rem;
  font-weight: 900;
  color: var(--primary);
  min-width: 60px;
}

.stat-label {
  font-size: 0.95rem;
  color: var(--text-light);
  font-weight: 500;
}

/* ===== Mentors ===== */
.mentors-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.mentor-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
  transition: transform 0.3s, box-shadow 0.3s;
}

.mentor-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.mentor-avatar {
  width: 100px;
  height: 100px;
  margin: 0 auto 20px;
  border-radius: 50%;
  overflow: hidden;
}

.mentor-avatar-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
}

.mentor-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.mentor-position {
  font-size: 0.9rem;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 20px;
}

.mentor-details {
  text-align: left;
  padding: 16px 0;
  border-top: 1px solid var(--border);
}

.mentor-details li {
  font-size: 0.88rem;
  color: var(--text-light);
  padding: 3px 0;
  line-height: 1.6;
}

.mentor-details li strong {
  color: var(--text);
  font-size: 0.9rem;
}

.mentor-edu {
  font-size: 0.85rem;
  color: var(--text-lighter);
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-weight: 500;
}

/* ===== Camp ===== */
.camp-content {
  max-width: 900px;
  margin: 0 auto;
}

.camp-info h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
}

.camp-info > p {
  font-size: 1.05rem;
  color: var(--text-light);
  line-height: 1.9;
  margin-bottom: 40px;
}

.camp-features {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 40px;
}

.camp-feature {
  display: flex;
  gap: 20px;
  padding: 24px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform 0.2s, box-shadow 0.2s;
}

.camp-feature:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  font-size: 2rem;
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.camp-feature h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text);
}

.camp-feature p {
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 1.7;
}

.camp-partners {
  padding: 24px;
  background: linear-gradient(135deg, rgba(67,56,202,0.04), rgba(99,102,241,0.06));
  border-radius: var(--radius);
  border: 1px solid rgba(67, 56, 202, 0.12);
}

.camp-partners h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.camp-partners p {
  font-size: 1rem;
  color: var(--text);
  font-weight: 500;
}

/* ===== Programs ===== */
.programs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.program-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  position: relative;
  transition: transform 0.3s, box-shadow 0.3s;
  display: flex;
  flex-direction: column;
}

.program-card::before {
  content: attr(data-num);
  position: absolute;
  top: 16px;
  right: 20px;
  font-size: 2.5rem;
  font-weight: 900;
  color: rgba(67, 56, 202, 0.06);
  line-height: 1;
}

.program-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.program-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--primary);
  background: rgba(67, 56, 202, 0.08);
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 16px;
  width: fit-content;
}

.program-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
  line-height: 1.4;
}

.program-card > p {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 16px;
  line-height: 1.6;
}

.program-topics {
  flex: 1;
  margin-bottom: 16px;
}

.program-topics li {
  font-size: 0.85rem;
  color: var(--text-light);
  padding: 4px 0 4px 16px;
  position: relative;
  line-height: 1.6;
}

.program-topics li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary-light);
}

.program-target {
  font-size: 0.82rem;
  color: var(--text-lighter);
  font-weight: 500;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  margin-top: auto;
}

/* ===== Reviews ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.review-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.review-stars {
  color: #f59e0b;
  font-size: 1.1rem;
  margin-bottom: 16px;
  letter-spacing: 2px;
}

.review-text {
  font-size: 0.98rem;
  color: var(--text-light);
  line-height: 1.8;
  font-style: italic;
}

/* ===== CTA Section ===== */
.section-cta {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  text-align: center;
  padding: 100px 0;
}

.cta-title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 900;
  color: #fff;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.cta-text {
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.8);
  max-width: 650px;
  margin: 0 auto 36px;
  line-height: 1.9;
}

.section-cta .btn-primary {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
}

.section-cta .btn-primary:hover {
  background: #f0f0ff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-dark);
  color: rgba(255, 255, 255, 0.6);
  padding: 60px 0 40px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 30px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 30px;
}

.footer-brand h3 {
  font-size: 1.4rem;
  font-weight: 900;
  color: #fff;
}

.footer-brand h3 span {
  font-weight: 400;
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.9rem;
  margin-left: 6px;
}

.footer-brand p {
  font-size: 0.9rem;
  margin-top: 4px;
}

.footer-info p {
  font-size: 0.9rem;
  text-align: right;
  line-height: 1.7;
}

.footer-bottom {
  text-align: center;
}

.footer-bottom p {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.35);
}

/* ===== Scroll Animation ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .programs-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .mentors-grid .mentor-card:last-child {
    grid-column: 1 / -1;
    max-width: 400px;
    margin: 0 auto;
  }
}

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

  .nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 24px;
    gap: 4px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    opacity: 0;
    transition: transform 0.3s, opacity 0.3s;
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
  }

  .nav-link {
    width: 100%;
    text-align: center;
    padding: 12px;
  }

  .nav-cta {
    margin-left: 0;
    margin-top: 8px;
  }

  .hero {
    min-height: 90vh;
    padding: 100px 24px 60px;
  }

  .section {
    padding: 70px 0;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

  .mentors-grid .mentor-card:last-child {
    max-width: none;
  }

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

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

  .footer-content {
    flex-direction: column;
    text-align: center;
    gap: 20px;
  }

  .footer-info p {
    text-align: center;
  }

  .hero-shape-1 {
    width: 300px;
    height: 300px;
  }

  .hero-shape-2 {
    width: 200px;
    height: 200px;
  }

  .hero-shape-3 {
    width: 120px;
    height: 120px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    letter-spacing: -1px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 280px;
  }

  .stat-card {
    padding: 20px 24px;
  }

  .stat-number {
    font-size: 1.6rem;
  }

  .mentor-card {
    padding: 32px 24px;
  }
}