@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;700;900&display=swap');

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

body {
  font-family: 'Noto Sans KR', sans-serif;
  background: #ffffff;
  color: #1a1a1a;
  line-height: 1.8;
}

a { color: #0066cc; text-decoration: none; transition: color 0.2s; }
a:hover { color: #004499; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

header {
  background: #ffffff;
  border-bottom: 2px solid #e8e8e8;
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 900;
  color: #0066cc;
  letter-spacing: -1px;
}

.logo span { color: #e53e3e; }

nav a {
  margin-left: 28px;
  font-size: 0.95rem;
  font-weight: 500;
  color: #555555;
}

nav a:hover, nav a.active { color: #0066cc; }

.hero {
  position: relative;
  height: 320px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f0f4f8;
}

.hero img {
  position: absolute;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
}

.hero-overlay {
  position: relative;
  text-align: center;
  z-index: 2;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 900;
  color: #1a1a1a;
  margin-bottom: 12px;
}

.hero p {
  font-size: 1.1rem;
  color: #555555;
  max-width: 600px;
  margin: 0 auto;
}

.section-title {
  font-size: 1.8rem;
  font-weight: 700;
  color: #1a1a1a;
  margin: 50px 0 30px;
  padding-bottom: 12px;
  border-bottom: 3px solid #0066cc;
  display: inline-block;
}

.curriculum-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
  margin-bottom: 60px;
}

.card {
  background: #ffffff;
  border: 1px solid #e0e0e0;
  border-radius: 12px;
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

.card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.card-body {
  padding: 20px;
}

.card-level {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.7rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.level-beginner { background: #0a7c3e; color: #ffffff; }
.level-intermediate { background: #d97706; color: #ffffff; }
.level-advanced { background: #c53030; color: #ffffff; }

.card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 8px;
}

.card p {
  font-size: 0.9rem;
  color: #555555;
  margin-bottom: 12px;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}

.tag {
  display: inline-block;
  padding: 2px 8px;
  background: #f0f4ff;
  color: #0066cc;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 500;
  border: 1px solid #d0daf0;
}

.card-meta {
  font-size: 0.8rem;
  color: #999999;
}

.article-content {
  max-width: 780px;
  margin: 40px auto 80px;
  padding: 0 20px;
}

.article-content h1 {
  font-size: 2rem;
  font-weight: 900;
  color: #1a1a1a;
  margin-bottom: 16px;
}

.article-meta {
  color: #999999;
  font-size: 0.9rem;
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 1px solid #e0e0e0;
}

.article-content img {
  width: 100%;
  border-radius: 8px;
  margin: 24px 0;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #0066cc;
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid #e8f0fe;
}

.article-content h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: #1a1a1a;
  margin: 28px 0 12px;
}

.article-content p {
  margin-bottom: 16px;
  font-size: 1rem;
  color: #333333;
}

.article-content strong {
  color: #1a1a1a;
  font-weight: 700;
}

.article-content ul, .article-content ol {
  margin: 12px 0 20px 24px;
  color: #333333;
}

.article-content li { margin-bottom: 8px; }

.tip-box {
  background: #e6f9ee;
  border-left: 4px solid #0a7c3e;
  padding: 16px 20px;
  border-radius: 0 8px 8px 0;
  margin: 20px 0;
  color: #1a1a1a;
}

.tip-box strong { color: #0a7c3e; }

.warning-box {
  background: #fff8e6;
  border-left: 4px solid #b8860b;
  padding: 16px 20px;
  border-radius: 0 8px 8px 0;
  margin: 20px 0;
  color: #1a1a1a;
}

.warning-box strong { color: #b8860b; }

.danger-box {
  background: #fde8e8;
  border-left: 4px solid #c53030;
  padding: 16px 20px;
  border-radius: 0 8px 8px 0;
  margin: 20px 0;
  color: #1a1a1a;
}

.danger-box strong { color: #c53030; }

.breadcrumb {
  padding: 16px 0;
  font-size: 0.85rem;
  color: #999999;
}

.breadcrumb a { color: #555555; }

footer {
  background: #f8f9fa;
  border-top: 1px solid #e0e0e0;
  padding: 30px 0;
  text-align: center;
  color: #999999;
  font-size: 0.85rem;
}

@media (max-width: 768px) {
  .hero h1 { font-size: 1.8rem; }
  .curriculum-grid { grid-template-columns: 1fr; }
  nav a { margin-left: 16px; font-size: 0.85rem; }
}