:root {
  font-family: Pretendard, "Apple SD Gothic Neo", "Noto Sans KR", system-ui, sans-serif;
  color: #173c58;
  background: #eef8fd;
  font-synthesis: none;
  --content-ink: #173c58;
  --content-muted: #627d8f;
  --content-blue: #1f8ce8;
  --content-surface: #ffffff;
  --content-line: #dceaf2;
  --content-yellow: #ffdb4d;
  --content-radius-lg: 24px;
  --content-radius-md: 16px;
  --content-shadow: 0 14px 38px rgba(31, 82, 116, 0.11);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: linear-gradient(180deg, #e2f5ff 0, #f5fbfe 380px, #eef8fd 100%); }
a { color: #176da8; text-underline-offset: 3px; }
a:focus-visible { outline: 3px solid rgba(31, 140, 232, .35); outline-offset: 3px; }

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: min(calc(100% - 28px), 960px);
  min-height: 64px;
  margin: 0 auto;
  padding-top: env(safe-area-inset-top);
}
.site-nav a { min-height: 44px; display: inline-flex; align-items: center; text-decoration: none; }
.site-brand { gap: 7px; color: var(--content-ink); font-size: 16px; font-weight: 900; }
.site-nav > div { display: flex; gap: 14px; }
.site-nav > div a { color: #527186; font-size: 13px; font-weight: 750; }

.content-shell { width: min(calc(100% - 28px), 860px); margin: 24px auto 64px; }
.article-card,
.index-hero {
  border: 1px solid rgba(255, 255, 255, .92);
  border-radius: var(--content-radius-lg);
  background: var(--content-surface);
  box-shadow: var(--content-shadow);
}
.article-card { overflow: hidden; }
.article-hero,
.index-hero { padding: clamp(26px, 6vw, 54px); }
.article-hero { background: linear-gradient(150deg, #f5fcff 0%, #e6f6ff 100%); }
.index-hero { margin-bottom: 18px; }
.eyebrow { margin: 0 0 10px; color: var(--content-blue); font-size: 12px; font-weight: 900; letter-spacing: .03em; }
h1 { max-width: 700px; margin: 0; font-size: clamp(30px, 7vw, 48px); line-height: 1.15; letter-spacing: -.045em; }
.lead,
.index-hero > p:not(.eyebrow) { max-width: 690px; margin: 18px 0 0; color: #4f6e82; font-size: 16px; line-height: 1.75; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.primary-link,
.secondary-link {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  border-radius: 13px;
  padding: 0 17px;
  font-size: 14px;
  font-weight: 850;
  text-decoration: none;
}
.primary-link { margin-top: 24px; background: var(--content-ink); color: #fff; }
.hero-actions .primary-link { margin-top: 0; }
.secondary-link { border: 1px solid #cfe3ef; background: #fff; color: #386783; }

.guide-stat { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin: 24px 0 0; }
.guide-stat > div { border: 1px solid #dcecf4; border-radius: var(--content-radius-md); padding: 15px; background: rgba(255, 255, 255, .82); }
.guide-stat dt { color: #6f899a; font-size: 11px; font-weight: 750; }
.guide-stat dd { margin: 6px 0 0; font-size: 20px; font-weight: 900; }

.article-section,
.source-card,
.safety-note { padding: 28px clamp(24px, 6vw, 54px); }
.article-section + .article-section { border-top: 1px solid #edf3f6; }
.article-section h2,
.source-card h2,
.safety-note h2 { margin: 0 0 13px; font-size: 21px; letter-spacing: -.035em; }
.article-section p,
.article-section li,
.source-card p,
.safety-note p { color: #496a7f; font-size: 15px; line-height: 1.8; }
.article-section p { margin: 0; }
.article-section p + p { margin-top: 12px; }
.article-section ul { margin: 0; padding-left: 22px; }
.article-section li + li { margin-top: 8px; }
.article-section code { border-radius: 5px; padding: 2px 5px; background: #eef5f8; font-size: .9em; }

.safety-note { margin: 0 clamp(18px, 5vw, 42px) 24px; border: 1px solid #f1d57c; border-radius: var(--content-radius-md); background: #fff9df; }
.safety-note h2 { color: #695300; }
.safety-note p { margin: 0; color: #756229; }
.source-card { margin: 0 clamp(18px, 5vw, 42px) 42px; border-radius: var(--content-radius-md); background: #f2f8fb; }
.source-card p { margin: 0; }
.source-card p + p { margin-top: 8px; }
.source-card a { font-weight: 800; }

.ad-area { min-height: 120px; margin: 8px clamp(24px, 6vw, 54px) 32px; border-block: 1px solid #edf2f5; padding: 18px 0; }
.ad-label { display: block; margin-bottom: 8px; color: #8799a5; font-size: 10px; letter-spacing: .08em; }

.guide-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.guide-card {
  display: flex;
  min-height: 230px;
  flex-direction: column;
  border: 1px solid var(--content-line);
  border-radius: var(--content-radius-lg);
  padding: 24px;
  background: #fff;
  box-shadow: 0 8px 24px rgba(36, 89, 124, .07);
  color: inherit;
  text-decoration: none;
}
.guide-card:hover { border-color: #a8d5ec; transform: translateY(-2px); }
.guide-card span { color: var(--content-blue); font-size: 11px; font-weight: 900; }
.guide-card strong { margin-top: 9px; font-size: 21px; line-height: 1.35; letter-spacing: -.03em; }
.guide-card p { margin: 12px 0 18px; color: var(--content-muted); font-size: 14px; line-height: 1.65; }
.guide-card b { margin-top: auto; color: #176da8; font-size: 13px; }

.table-wrap { overflow-x: auto; border: 1px solid var(--content-line); border-radius: 14px; }
table { width: 100%; min-width: 650px; border-collapse: collapse; background: #fff; text-align: left; }
th, td { border-bottom: 1px solid #e7f0f5; padding: 13px; font-size: 13px; line-height: 1.55; vertical-align: top; }
th { background: #eff7fb; color: #355b72; }
td { color: #526f81; }
tr:last-child td { border-bottom: 0; }

.site-footer { width: min(calc(100% - 28px), 860px); margin: 0 auto; padding: 0 0 max(34px, env(safe-area-inset-bottom)); color: #718897; }
.site-footer > strong { color: #46677b; font-size: 13px; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 4px 18px; margin-top: 10px; }
.site-footer a { display: inline-flex; min-height: 32px; align-items: center; color: #5d7a8c; font-size: 12px; }
.site-footer p { margin: 8px 0 0; font-size: 11px; }

@media (max-width: 640px) {
  .site-nav { align-items: flex-start; padding-top: max(8px, env(safe-area-inset-top)); }
  .site-nav > div { gap: 6px; }
  .site-nav > div a { font-size: 11px; }
  .content-shell { margin-top: 14px; }
  .guide-grid { grid-template-columns: 1fr; }
  .guide-card { min-height: 0; }
  .guide-stat { grid-template-columns: 1fr; }
  .article-section, .source-card, .safety-note { padding: 24px 22px; }
  .safety-note, .source-card { margin-right: 14px; margin-left: 14px; }
  h1 { font-size: clamp(28px, 10vw, 39px); }
}

@media (max-width: 360px) {
  .site-nav > div a:last-child { display: none; }
  .content-shell { width: min(calc(100% - 20px), 860px); }
  .article-hero, .index-hero { padding: 24px 20px; }
  .hero-actions { display: grid; }
  .primary-link, .secondary-link { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}