:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #1f4fd8;
  --soft: #eef2ff;
  --radius: 18px;
  --max: 1120px;
  --content: 760px;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans KR", sans-serif;
  line-height: 1.72;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 18px 20px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
}
.logo { font-size: 22px; font-weight: 800; color: var(--text); }
.tagline { color: var(--muted); font-size: 14px; }
.nav a { margin-left: 16px; color: var(--text); font-size: 14px; }
.hero {
  max-width: var(--max);
  margin: 32px auto 20px;
  padding: 40px 20px;
}
.hero-card {
  background: linear-gradient(135deg, #ffffff, #eef2ff);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 36px;
}
.hero h1 { margin: 0 0 12px; font-size: clamp(30px, 5vw, 48px); line-height: 1.15; }
.hero p { margin: 0; color: var(--muted); max-width: 720px; }
.layout {
  max-width: var(--max);
  margin: 0 auto;
  padding: 20px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 28px;
}
.content, .sidebar-card, .post-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.content { padding: 34px; }
.post-body { max-width: var(--content); margin: 0 auto; }
.post-body h1 { line-height: 1.25; font-size: 34px; }
.post-body h2 { margin-top: 42px; padding-top: 18px; border-top: 1px solid var(--line); font-size: 25px; }
.post-body h3 { margin-top: 28px; font-size: 20px; }
.post-body p { margin: 16px 0; }
.post-body table { width: 100%; border-collapse: collapse; display: block; overflow-x: auto; }
.post-body th, .post-body td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; }
.post-body th { background: var(--soft); }
.summary-box, .disclaimer-box, .cta-box {
  background: var(--soft);
  border: 1px solid #dbe3ff;
  border-radius: 14px;
  padding: 18px 20px;
  margin: 22px 0;
}
.disclaimer-box { color: var(--muted); font-size: 14px; }
.post-list { display: grid; gap: 18px; }
.post-card { padding: 24px; }
.post-card h2 { margin: 0 0 8px; font-size: 22px; }
.post-card .meta { color: var(--muted); font-size: 13px; }
.sidebar { display: grid; gap: 16px; align-content: start; }
.sidebar-card { padding: 20px; }
.sidebar-card h3 { margin-top: 0; }
.site-footer { max-width: var(--max); margin: 30px auto; padding: 20px; color: var(--muted); font-size: 13px; }
pre, code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
pre { background: #111827; color: #f9fafb; padding: 18px; border-radius: 14px; overflow-x: auto; }
@media (max-width: 860px) {
  .header-inner { display: block; }
  .nav { margin-top: 12px; display: flex; flex-wrap: wrap; gap: 10px; }
  .nav a { margin-left: 0; }
  .layout { grid-template-columns: 1fr; padding: 12px; }
  .content { padding: 22px; }
  .sidebar { display: none; }
  .hero { margin-top: 14px; padding: 18px 12px; }
  .hero-card { padding: 24px; }
}