:root {
  --navy: #46549c;
  --blue: #248dac;
  --green: #228d7b;
  --bg: #f8f9fc;
  --white: #ffffff;
  --text: #1a1f36;
  --sub: #6b7280;
  --border: #e5e7eb;
  --shadow: 0 4px 20px rgba(70, 84, 156, 0.1);
  --shadow-strong: 0 10px 30px rgba(70, 84, 156, 0.18);
  --radius: 12px;
  --transition: 0.3s ease;
  --font: "Noto Sans KR", sans-serif;
  --max-width: 1100px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

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

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 80px 0;
}

.skip-link {
  position: absolute;
  left: 8px;
  top: -40px;
  background: var(--text);
  color: var(--white);
  padding: 8px 12px;
  border-radius: 6px;
  z-index: 1200;
}

.skip-link:focus {
  top: 8px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: var(--transition);
  background: transparent;
}

.site-header.scrolled {
  background: var(--white);
  box-shadow: var(--shadow);
}

.header-inner {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--navy);
}

.logo-mark {
  width: 22px;
  height: 22px;
  border-radius: 5px;
  background: var(--navy);
}

.primary-nav {
  display: flex;
  gap: 24px;
  font-weight: 500;
}

.primary-nav a {
  color: var(--sub);
  transition: var(--transition);
}

.primary-nav a:hover,
.primary-nav a.active {
  color: var(--navy);
}

.menu-toggle {
  display: none;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
  transition: var(--transition);
}

#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--navy) 0%, var(--blue) 100%);
  color: var(--white);
}

.hero-inner {
  width: 100%;
  max-width: 600px;
  text-align: left;
}

.hero-badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.2);
  padding: 8px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
  font-weight: 500;
}

h1 {
  font-size: 3rem;
  line-height: 1.25;
  margin-bottom: 20px;
}

.hero-desc {
  font-size: 1.1rem;
  margin-bottom: 26px;
}

.hero-actions,
.program-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  padding: 12px 28px;
  border: 1px solid transparent;
  font-weight: 500;
  transition: var(--transition);
  cursor: pointer;
}

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

.btn-primary {
  background: var(--navy);
  color: var(--white);
}

.btn-secondary {
  background: var(--blue);
  color: var(--white);
}

.btn-light {
  background: var(--white);
  color: var(--navy);
}

.btn-outline-light {
  border-color: rgba(255, 255, 255, 0.75);
  color: var(--white);
}

.btn-outline {
  border-color: var(--navy);
  color: var(--navy);
  background: transparent;
}

.section-head h2,
#about h2,
#contact h2 {
  font-size: 2rem;
  margin-bottom: 12px;
}

.section-head p {
  color: var(--sub);
}

.section-head.center {
  text-align: center;
}

#about {
  background: var(--white);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 24px;
}

.about-text p {
  color: var(--sub);
}

.about-cards {
  display: grid;
  gap: 14px;
}

.about-card,
.program-card,
.news-card,
.contact-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.about-card:hover,
.program-card:hover,
.news-card:hover,
.contact-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-strong);
}

.about-card {
  border-left: 3px solid var(--navy);
  padding: 18px;
}

.card-icon {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

#programs {
  background: var(--bg);
}

.program-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 20px;
}

.program-top {
  height: 8px;
  border-radius: var(--radius) var(--radius) 0 0;
}

.program-top.navy {
  background: var(--navy);
}

.program-top.blue {
  background: var(--blue);
}

.program-body {
  padding: 20px;
}

.program-badge {
  display: inline-block;
  background: #edf0ff;
  color: var(--navy);
  border-radius: 999px;
  padding: 5px 10px;
  font-size: 0.9rem;
}

.program-badge.blue-badge {
  background: #e8f4fd;
  color: var(--blue);
}

.program-body h3 {
  margin: 10px 0;
}

.tags {
  margin: 12px 0 16px;
  color: var(--green);
  font-weight: 500;
}

#stats {
  background: var(--navy);
  color: var(--white);
}

.stats-grid {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.stat-card {
  background: rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  padding: 18px 14px;
  text-align: center;
}

.stat-num {
  font-size: 2rem;
  font-weight: 700;
}

#news {
  background: var(--white);
}

.news-grid {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.news-card {
  padding: 16px;
}

.news-thumb {
  width: 100%;
  height: 120px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  font-size: 2rem;
  margin-bottom: 12px;
}

.news-tag {
  display: inline-block;
  border-radius: 999px;
  background: #edf0ff;
  color: var(--navy);
  font-size: 0.8rem;
  padding: 4px 10px;
  margin-bottom: 8px;
}

.news-tag.activity {
  background: #e8f5f2;
  color: var(--green);
}

.news-date {
  color: var(--sub);
  margin-top: 6px;
}

.news-more {
  text-align: center;
  margin-top: 26px;
}

#contact {
  background: var(--bg);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.contact-card {
  padding: 20px;
}

.contact-card p + p {
  margin-top: 8px;
}

.site-footer {
  background: #1a1f36;
  color: #d8deff;
  padding-top: 36px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr 1fr;
  gap: 20px;
}

.footer-logo {
  color: var(--white);
  margin-bottom: 8px;
  font-weight: 700;
}

.footer-links,
.footer-contact {
  display: grid;
  gap: 8px;
}

.footer-links a:hover,
.footer-contact a:hover {
  color: var(--white);
}

.copyright {
  text-align: center;
  color: #a8afcc;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  margin-top: 24px;
  padding: 12px 0;
}

.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 2px;
}

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

  .menu-toggle {
    display: inline-block;
    margin-left: auto;
  }

  .primary-nav {
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    flex-direction: column;
    gap: 0;
    display: none;
  }

  .primary-nav a {
    padding: 14px 24px;
    border-top: 1px solid #f1f4fb;
  }

  .primary-nav.is-open {
    display: flex;
  }

  h1 {
    font-size: 2rem;
  }

  .about-grid,
  .program-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

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

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

  .btn {
    width: 100%;
  }

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

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