:root {
  color-scheme: light;
  --navy: #0f2b5c;
  --ink: #191c1e;
  --muted: #52627a;
  --line: #dfe5ec;
  --accent: #ff4d26;
  --surface: #f8f9fc;
  --font: 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--surface); color: var(--ink); font-family: var(--font); }
a { color: var(--navy); }
a:focus-visible { outline: 2px solid var(--navy); outline-offset: 3px; }

.site-head { width: min(100%, 1024px); margin: 0 auto 36px; padding: 40px 16px 0; }
.brand { display: inline-flex; align-items: center; gap: 2px; height: 42px; text-decoration: none; }
.brand-avatar { display: block; width: 42px; height: 42px; object-fit: contain; flex: none; }
.brand-wordmark { display: block; position: relative; width: 84px; height: 28px; overflow: hidden; flex: none; }
.brand-wordmark img { position: absolute; display: block; width: 164px; height: 164px; max-width: none; left: -68px; top: -68px; }
.breadcrumbs { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; min-height: 20px; margin-top: 20px; color: #434750; font-size: 12px; font-weight: 600; line-height: 1.4; }
.breadcrumbs a { color: var(--navy); text-decoration: none; font-weight: 700; }
.breadcrumbs a:hover { color: var(--accent); text-decoration: underline; }
.breadcrumb-chevron { color: #737781; font-size: 18px; line-height: 1; }

.article { width: min(100%, 720px); margin: 0 auto; padding: 0 24px 88px; }
h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 24px; color: var(--navy); font-size: clamp(28px, 3.2vw, 34px); font-weight: 800; letter-spacing: -.025em; line-height: 1.35; }
.intro { margin-bottom: 42px; }
.intro p { color: var(--muted); font-size: 17px; line-height: 1.85; }
.intro p + p { margin-top: 16px; }
.article-section { margin-top: 48px; }
.intro + .article-section { margin-top: 0; }
.article-section h2 { margin-bottom: 18px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--navy); font-size: clamp(21px, 2.3vw, 24px); font-weight: 700; line-height: 1.45; }
.article-section p { margin-bottom: 16px; font-size: 16px; line-height: 1.9; }
.article-section p:last-child { margin-bottom: 0; }

@media (max-width: 700px) {
  .site-head { padding: 24px 16px 0; margin-bottom: 28px; }
  .brand { height: 38px; }
  .brand-avatar { width: 38px; height: 38px; }
  .brand-wordmark { width: 77px; height: 26px; }
  .brand-wordmark img { width: 150px; height: 150px; left: -62px; top: -62px; }
  .breadcrumbs { min-height: 44px; margin-top: 10px; font-size: 14px; }
  .article { padding: 0 20px 64px; }
  .intro { margin-bottom: 32px; }
  .intro p { font-size: 16px; }
  .article-section { margin-top: 36px; }
}