:root{--ink:#17221c;--muted:#747b75;--line:#e3e7e1;--paper:#fafbf8;--yellow:#e7d222;--green:#249644;--blue:#039dcd;--red:#d31325}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--paper);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;font-size:14px;line-height:1.7}a{color:inherit;text-decoration:none}button,input{font:inherit}button,a,input{touch-action:manipulation}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible{outline:2px solid #249644;outline-offset:4px}header{height:76px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 38px;position:fixed;inset:0 0 auto;z-index:10}.brand{display:flex;align-items:center;gap:30px}.wordmark{font-size:30px;font-weight:900;letter-spacing:-2px;line-height:1}.brand-dot{display:inline-block;width:7px;height:7px;background:var(--yellow);margin:0 0 3px 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@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto;transition:none!important}}
.language-switch{display:flex;border:1px solid var(--line);border-radius:4px;padding:3px;gap:2px}.language-switch button{border:0;background:transparent;color:var(--muted);font-size:11px;padding:5px 9px;border-radius:2px;line-height:1.3}.language-switch button[aria-pressed="true"]{background:#1c2c22;color:white}html[lang="en"] .brand-sub{letter-spacing:1.2px}html[lang="en"] .section-kicker{letter-spacing:1px}html[lang="en"] .nav-link{line-height:1.45;padding-top:9px;padding-bottom:9px}html[lang="en"] .hero-copy h1 span{font-size:32px}html[lang="en"] .section-heading>span{max-width:45%;text-align:right}html[lang="en"] .article-head h1{line-height:1.25}
@media(max-width:800px){.header-end{gap:8px}.language-switch button{padding:5px 7px}.header-end .version{display:none}html[lang="en"] .hero-copy h1 span{font-size:28px}html[lang="en"] .section-heading>span{font-size:10px}html[lang="en"] .route-card h3{font-size:16px}html[lang="en"] .article-head h1{font-size:28px}}

.diagram-translations{padding:20px;border-top:1px solid var(--line);background:#f5f7f1}.diagram-translations-heading{display:flex;align-items:center;gap:10px}.diagram-translations-heading h2{font-size:14px;letter-spacing:0;line-height:1.5}.translation-badge{background:#1c2c22;color:white;font:10px ui-monospace,monospace;padding:3px 6px;border-radius:2px}.diagram-translations-intro{font-size:11px;color:var(--muted);margin:10px 0 18px;line-height:1.7}.diagram-translations dl{margin:0}.diagram-translation-row{border-top:1px solid #e0e5da;padding:12px 0}.diagram-translation-row:last-child{padding-bottom:0}.diagram-translation-row dt{font-size:11px;line-height:1.7;color:#747e70;margin-bottom:5px;overflow-wrap:anywhere}.diagram-translation-row dd{font-size:13px;line-height:1.8;color:#243326;margin:0;overflow-wrap:anywhere}#viewer-translations{max-width:850px;margin:0 auto 24px}#viewer-translations .diagram-translations{border:1px solid var(--line);margin:0 15px}.diagram figcaption{gap:12px}.diagram figcaption span{min-width:0}html[lang="en"] .diagram-translations-heading h2{font-size:14px}@media(max-width:800px){.diagram-translations{padding:18px}.diagram-translation-row dd{font-size:13px}.diagram-translations-heading h2{font-size:14px}}