:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b7280;
  --line: #e5e7eb;
  --brand: #0a6cff;
  --brand-dark: #0850c4;
  --soft: #f5f7fa;
  --radius: 14px;
  --maxw: 760px;
  --font: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard", "Malgun Gothic", "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--fg);
  background: var(--bg);
  line-height: 1.75;
  font-size: 17px;
  word-break: keep-all;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; border-radius: var(--radius); display: block; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,0.9);
  backdrop-filter: saturate(180%) blur(8px);
  position: sticky; top: 0; z-index: 10;
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 62px; }
.brand { font-weight: 800; font-size: 18px; color: var(--fg); letter-spacing: -0.02em; }
.brand span { color: var(--brand); }
.header-cta {
  background: var(--brand); color: #fff; padding: 8px 15px; border-radius: 999px;
  font-size: 14px; font-weight: 700;
}
.header-cta:hover { background: var(--brand-dark); text-decoration: none; }

/* Hero */
.hero { padding: 44px 0 26px; border-bottom: 1px solid var(--line); }
.hero h1 { font-size: 27px; line-height: 1.35; margin: 0 0 10px; letter-spacing: -0.03em; }
.hero p { color: var(--muted); margin: 0; font-size: 16px; }
.hero .meta-row { margin-top: 18px; display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font-size: 13px; background: var(--soft); color: #374151; padding: 6px 12px;
  border-radius: 999px; border: 1px solid var(--line);
}

/* Post list */
.post-list { padding: 12px 0 40px; }
.post-card { padding: 22px 0; border-bottom: 1px solid var(--line); }
.post-card:last-child { border-bottom: 0; }
.post-card .date { color: var(--muted); font-size: 13px; }
.post-card h2 { font-size: 20px; margin: 6px 0 8px; letter-spacing: -0.02em; }
.post-card h2 a { color: var(--fg); }
.post-card p { margin: 0; color: #4b5563; font-size: 15.5px; }
.post-card .tags { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 6px; }
.tag { font-size: 12.5px; color: var(--brand); background: #eef4ff; padding: 3px 9px; border-radius: 6px; }

/* Article */
article.post { padding: 34px 0 20px; }
article.post .date { color: var(--muted); font-size: 14px; }
article.post h1 { font-size: 27px; line-height: 1.4; margin: 8px 0 18px; letter-spacing: -0.03em; }
article.post .cover { margin: 0 0 24px; }
article.post .body p { margin: 0 0 20px; }
article.post .body h2 { font-size: 21px; margin: 34px 0 12px; letter-spacing: -0.02em; }
article.post .body h3 { font-size: 18px; margin: 26px 0 10px; }
article.post .body ul, article.post .body ol { padding-left: 22px; margin: 0 0 20px; }
article.post .body li { margin: 4px 0; }

/* Business card / CTA */
.biz-card {
  margin: 34px 0; padding: 22px; background: var(--soft);
  border: 1px solid var(--line); border-radius: var(--radius);
}
.biz-card h3 { margin: 0 0 12px; font-size: 17px; }
.biz-card dl { margin: 0; display: grid; grid-template-columns: 78px 1fr; gap: 8px 12px; font-size: 15px; }
.biz-card dt { color: var(--muted); }
.biz-card dd { margin: 0; }
.biz-card .call-btn {
  display: inline-block; margin-top: 16px; background: var(--brand); color: #fff;
  padding: 12px 20px; border-radius: 10px; font-weight: 700; font-size: 16px;
}
.biz-card .call-btn:hover { background: var(--brand-dark); text-decoration: none; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding: 30px 0 50px; color: var(--muted); font-size: 13.5px; }
.site-footer .biz-name { color: var(--fg); font-weight: 700; }
.site-footer a { color: var(--muted); }
.back-link { display: inline-block; margin: 6px 0 0; font-size: 14px; }

@media (max-width: 480px) {
  body { font-size: 16px; }
  .hero h1 { font-size: 23px; }
  article.post h1 { font-size: 23px; }
}