:root {
  --bg: #f4f5f7; --panel: #fff; --text: #1c1e24; --muted: #636a78;
  --accent: #2f7bff; --border: rgba(0,0,0,.09); --tint: rgba(47,123,255,.07);
  --shadow: 0 18px 50px rgba(20,30,60,.10);
}
[data-theme="dark"] {
  --bg: #0e1014; --panel: #171a21; --text: #f1f3f8; --muted: #98a1b2;
  --accent: #4d8dff; --border: rgba(255,255,255,.09); --tint: rgba(77,141,255,.10);
  --shadow: 0 18px 55px rgba(0,0,0,.32);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; color: var(--text); background: var(--bg);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "PingFang TC", "Helvetica Neue", sans-serif;
  -webkit-font-smoothing: antialiased; transition: color .2s, background .2s;
}
a { color: var(--accent); text-decoration-thickness: .08em; text-underline-offset: .18em; }
a:hover { text-decoration-thickness: .12em; }
.wrap { width: min(1080px, calc(100% - 40px)); margin-inline: auto; }
.nav { height: 72px; display: flex; align-items: center; gap: 14px; border-bottom: 1px solid var(--border); }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 750; }
.mark { width: 30px; height: 30px; }
.nav-links { margin-left: auto; display: flex; align-items: center; gap: 18px; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: 14px; }
.nav-links a[aria-current="page"] { color: var(--text); font-weight: 650; }
.theme-toggle { width: 38px; height: 38px; border: 1px solid var(--border); border-radius: 10px; color: var(--text); background: var(--panel); cursor: pointer; font-size: 16px; }
.language { display: flex; gap: 8px; font-size: 13px; }
.language a { color: var(--muted); text-decoration: none; }
.language a[aria-current="true"] { color: var(--text); font-weight: 700; }
.blog-hero { padding: 76px 0 42px; max-width: 760px; }
.eyebrow { color: var(--accent); text-transform: uppercase; letter-spacing: .09em; font-size: 12px; font-weight: 750; }
h1 { margin: 12px 0 18px; font-size: clamp(36px, 6vw, 58px); line-height: 1.08; letter-spacing: -.035em; }
.lede { margin: 0; color: var(--muted); font-size: clamp(17px, 2vw, 20px); }
.article-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; padding: 16px 0 80px; }
.article-card { display: flex; flex-direction: column; min-height: 260px; padding: 26px; border: 1px solid var(--border); border-radius: 17px; background: var(--panel); color: var(--text); text-decoration: none; box-shadow: var(--shadow); transition: transform .15s, border-color .15s; }
.article-card:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--accent), transparent 58%); }
.article-card .category { color: var(--accent); font-size: 12px; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; }
.article-card h2 { margin: 11px 0 10px; font-size: 23px; line-height: 1.28; letter-spacing: -.015em; }
.article-card p { margin: 0; color: var(--muted); font-size: 14.5px; }
.article-card .read { margin-top: auto; padding-top: 22px; color: var(--accent); font-size: 13px; font-weight: 650; }
.breadcrumb { padding-top: 30px; color: var(--muted); font-size: 13px; }
.breadcrumb a { color: var(--muted); }
.article-head { max-width: 800px; padding: 54px 0 34px; }
.article-head h1 { font-size: clamp(34px, 5.6vw, 56px); }
.meta { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 24px; color: var(--muted); font-size: 13px; }
.article-layout { display: grid; grid-template-columns: minmax(0, 720px) 260px; gap: 64px; align-items: start; padding-bottom: 80px; }
.article-body { min-width: 0; }
.article-body h2 { margin: 48px 0 14px; font-size: 29px; line-height: 1.25; letter-spacing: -.02em; scroll-margin-top: 24px; }
.article-body h3 { margin: 30px 0 8px; font-size: 20px; line-height: 1.35; }
.article-body p { margin: 0 0 19px; }
.article-body ul, .article-body ol { margin: 0 0 24px; padding-left: 1.4em; }
.article-body li { margin: 7px 0; padding-left: .2em; }
.note { margin: 30px 0; padding: 20px 22px; background: var(--tint); border: 1px solid color-mix(in srgb, var(--accent), transparent 70%); border-radius: 13px; }
.note strong { display: block; margin-bottom: 4px; }
.toc { position: sticky; top: 24px; padding: 20px; border: 1px solid var(--border); border-radius: 14px; background: var(--panel); }
.toc strong { display: block; margin-bottom: 10px; font-size: 13px; }
.toc a { display: block; margin: 7px 0; color: var(--muted); font-size: 13px; line-height: 1.45; text-decoration: none; }
.article-cta { margin: 48px 0 0; padding: 28px; border-radius: 16px; background: var(--tint); border: 1px solid var(--border); }
.article-cta h2 { margin: 0 0 8px; font-size: 23px; }
.article-cta p { margin-bottom: 20px; color: var(--muted); }
.button { display: inline-flex; padding: 11px 18px; border-radius: 10px; color: #fff; background: var(--accent); text-decoration: none; font-weight: 650; font-size: 14px; }
.related { padding: 44px 0 76px; border-top: 1px solid var(--border); }
.related h2 { margin: 0 0 20px; font-size: 26px; }
.related-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.related a { display: block; padding: 18px; border: 1px solid var(--border); border-radius: 13px; background: var(--panel); color: var(--text); text-decoration: none; font-weight: 650; line-height: 1.4; }
footer { padding: 34px 0 50px; border-top: 1px solid var(--border); color: var(--muted); font-size: 13px; }
footer .wrap { display: flex; justify-content: space-between; gap: 20px; }
@media (max-width: 840px) {
  .article-layout { grid-template-columns: 1fr; gap: 20px; }
  .toc { position: static; order: -1; }
  .article-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .wrap { width: min(100% - 28px, 1080px); }
  .nav { height: auto; min-height: 66px; flex-wrap: wrap; padding: 12px 0; }
  .nav-links { gap: 12px; }
  .language { width: 100%; order: 3; padding-bottom: 2px; }
  .blog-hero { padding-top: 54px; }
  .article-card { min-height: 0; }
  .article-head { padding-top: 40px; }
  .related-grid { grid-template-columns: 1fr; }
  footer .wrap { flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }