:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --text: #12203a;
  --muted: #5a667a;
  --primary: #1f6feb;
  --line: #e2e8f2;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 15%, #dceafe 0, transparent 45%),
    radial-gradient(circle at 85% 0%, #e9ecff 0, transparent 40%),
    var(--bg);
  line-height: 1.75;
}

.container {
  width: min(100%, 980px);
  max-width: 980px;
  margin: 0 auto;
  padding: clamp(0.9rem, 4vw, 1.5rem);
}

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: clamp(0.85rem, 2.4vw, 1rem) clamp(1rem, 4vw, 1.5rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.9rem;
}

.brand {
  font-weight: 800;
  font-size: clamp(1rem, 2.8vw, 1.1rem);
  text-decoration: none;
  color: var(--text);
  white-space: nowrap;
}

.nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: clamp(0.82rem, 1.9vw, 0.95rem);
}

.hero {
  background: linear-gradient(135deg, #1e3a8a, #2563eb);
  color: #fff;
  border-radius: 16px;
  padding: clamp(1.4rem, 5vw, 2.5rem);
  margin: 1.5rem 0;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.45rem, 6vw, 2.2rem);
}

.hero p { margin-top: 0.8rem; max-width: 70ch; opacity: 0.95; font-size: clamp(0.95rem, 3.7vw, 1.05rem); }

.topic-hubs {
  margin-top: 1.2rem;
}

.topic-hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.6rem;
  margin-top: 0.8rem;
}

.topic-hub-card {
  display: inline-block;
  border: 1px solid #d4e0f2;
  border-radius: 10px;
  background: #ffffff;
  color: #12306f;
  text-decoration: none;
  padding: 0.72rem;
}

.topic-hub-card:hover {
  background: #f3f7ff;
  border-color: #9ab6e8;
}

.cluster-nav {
  margin-top: 1.5rem;
}

.cluster-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.9rem;
  margin-top: 0.8rem;
}

.cluster-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #ffffff;
  padding: 1rem;
}

.cluster-card h3 {
  margin: 0 0 0.55rem;
  font-size: 1rem;
}

.cluster-card ul {
  margin: 0;
}

.cluster-card li {
  margin: 0.35rem 0;
}

.cluster-card a {
  font-size: 0.93rem;
  text-decoration: none;
  color: #1f3f90;
}

.cluster-card h3 a {
  font-size: 0.9rem;
  color: #1f3f90;
  margin-left: 0.35rem;
  font-weight: 700;
  white-space: nowrap;
}

.search-intent {
  margin-top: 1.8rem;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  list-style: none;
  margin: 0.8rem 0 0;
  padding: 0;
}

.tag-cloud li {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.32rem 0.7rem;
  background: #f8fbff;
  color: #25406f;
  font-size: 0.9rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
  text-decoration: none;
  color: var(--text);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(16, 24, 40, 0.12);
}

.card h2 {
  margin: 0.2rem 0 0.6rem;
  font-size: 1.1rem;
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  background: #edf2ff;
  color: #1f3f90;
  font-size: 0.78rem;
  margin-bottom: 0.6rem;
}

.card .muted {
  color: var(--muted);
  font-size: 0.9rem;
}

.article-layout {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: clamp(1.2rem, 4vw, 2rem);
}

.article-layout h1 {
  margin-top: 0;
}

.lede {
  font-size: clamp(0.95rem, 4vw, 1.05rem);
  color: #24324a;
}

section { margin: clamp(1.2rem, 4vw, 2rem) 0; }

h2 {
  margin-bottom: 0.4rem;
  color: #14243d;
  font-size: clamp(1.2rem, 4vw, 1.5rem);
}

ul, ol { padding-left: 1.1rem; }

.cta {
  background: #f4f8ff;
  border: 1px solid #cfe0ff;
  border-radius: 10px;
  padding: 1rem;
}

.affiliate {
  border-left: 4px solid var(--primary);
  padding-left: 0.9rem;
  margin: 0.9rem 0;
}

.footer {
  color: var(--muted);
  text-align: center;
  margin: 2.5rem 0 1rem;
  font-size: 0.9rem;
}

a {
  color: #1b3f9e;
}

@media (max-width: 640px) {
  .header-inner { flex-direction: column; align-items: flex-start; }
  .hero { padding: 1.4rem; }
}

@media (max-width: 1024px) {
  .topic-hub-grid,
  .cluster-grid,
  .grid {
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  }
}

@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    row-gap: 0.75rem;
  }

  .nav {
    width: 100%;
    gap: 0.55rem;
  }

  .topic-hub-grid,
  .cluster-grid,
  .grid {
    grid-template-columns: 1fr;
    gap: 0.8rem;
  }

  .cluster-card,
  .card,
  .topic-hub-card,
  .cta,
  .search-intent-intro,
  .content-ad {
    padding: 0.9rem;
  }

  .article-layout h1 {
    margin-top: 0;
    font-size: clamp(1.45rem, 7vw, 1.9rem);
  }
}

.article-nav {
  margin-top: 1.8rem;
}

.article-nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.article-nav a {
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.5rem 0.75rem;
  background: #f8fbff;
}

.faq {
  margin: 2rem 0 1.6rem;
  border-left: 4px solid #1f6feb;
  padding-left: 0.9rem;
}

.faq h2 {
  margin-top: 0;
}

.faq-item {
  margin: 0.65rem 0;
}

.search-intent-intro {
  border-left: 4px solid #1d4ed8;
  padding: 0.9rem 0.9rem 0.9rem 1rem;
  background: #f5f8ff;
}

.search-intent-intro h2 {
  margin-top: 0;
}

.content-ad {
  margin: 1.6rem 0;
  border: 1px dashed #c9d7ef;
  background: #f8fbff;
  border-radius: 10px;
  padding: 0.8rem;
  color: #2e4673;
  font-size: 0.9rem;
}

.ad-note {
  margin: 0;
}

.recommended {
  border-left: 4px solid #94a3b8;
  padding-left: 0.9rem;
  margin: 2rem 0 0;
}

.recommended ul {
  margin: 0.4rem 0 0;
}

.recommended li {
  margin: 0.25rem 0;
}

@media (max-width: 640px) {
  .article-nav-links {
    flex-direction: column;
  }

  .footer {
    margin: 2rem 0 1rem;
    font-size: 0.88rem;
  }

  section h2 { scroll-margin-top: 4.5rem; }
}