:root{color-scheme:light;--ink:#294453;--muted:#5c717c;--blue:#176b87;--green:#39715c;--paper:#fff;--wash:#f3f7fa;--line:#dce6ea;--soft:#e8f2f6;font-family:system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;font-synthesis:none}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--wash);color:var(--ink);font-size:16px;line-height:1.85}a{color:var(--blue);text-underline-offset:4px}a:hover{color:var(--green)}a:focus-visible{outline:3px solid var(--green);outline-offset:5px;border-radius:2px}.skip{position:absolute;left:16px;top:-100px;background:#fff;padding:8px 16px;z-index:10}.skip:focus{top:12px}.shell{width:min(100% - 48px,1040px);margin:auto}.header{background:var(--paper);border-bottom:1px solid var(--line)}.header-inner{min-height:90px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:inline-flex;align-items:center;gap:11px;text-decoration:none;color:var(--ink);font-weight:700;font-size:21px;white-space:nowrap}.brand svg{width:35px;height:35px;flex:none}.nav{display:flex;flex-wrap:wrap;gap:7px 22px;align-items:center}.nav a{text-decoration:none;font-size:14px;color:var(--muted);padding:5px 0}.nav a[aria-current=page]{color:var(--blue);box-shadow:0 2px var(--blue)}.main{padding-top:52px;padding-bottom:64px}.eyebrow{font-size:12px;letter-spacing:.14em;color:var(--green);font-weight:700;margin:0 0 12px}h1,h2,h3{line-height:1.4;letter-spacing:-.02em}h1{font-size:clamp(31px,5vw,48px);margin:0 0 18px}h2{font-size:24px;margin:40px 0 14px}h3{font-size:18px;margin:24px 0 8px}p{margin:0 0 16px}.lead{max-width:700px;font-size:18px;color:var(--muted)}.meta{font-size:14px;color:var(--muted);line-height:1.9}.pill{display:inline-block;background:var(--soft);color:var(--blue);font-size:13px;padding:3px 12px;border-radius:20px;margin:12px 0 0}.hero{display:grid;grid-template-columns:1.4fr .75fr;gap:64px;align-items:center;padding:20px 0 48px;border-bottom:1px solid var(--line)}.clock-art{width:220px;height:220px;border-radius:50%;background:#fff;border:1px solid var(--line);display:grid;place-items:center;margin:0 auto;box-shadow:0 16px 45px #29445308}.clock-art svg{width:150px;height:150px}.facts{display:grid;grid-template-columns:1fr 1fr 1fr;gap:28px;padding:8px 0 28px}.facts h2{font-size:19px;margin:32px 0 9px}.facts p{font-size:15px;color:var(--muted)}.note{padding:18px 22px;border-left:3px solid var(--green);background:#eaf2ee;margin:24px 0;color:#2d5343}.note p:last-child{margin-bottom:0}.document{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:38px 46px;max-width:880px}.document h1{font-size:34px}.document h2{font-size:22px;padding-top:4px}.document .lead{font-size:16px}.document li{margin:7px 0}.document ul,.document ol{padding-left:1.5em}.table-wrap{max-width:100%;overflow-x:auto;margin:20px 0}table{width:100%;border-collapse:collapse;min-width:440px;font-size:14px}th,td{padding:13px 15px;vertical-align:top;border-bottom:1px solid var(--line);text-align:left}th{background:var(--wash);font-weight:600}th:first-child{width:34%}code{font-family:ui-monospace,Consolas,monospace;font-size:.9em;overflow-wrap:anywhere;background:var(--wash);padding:2px 5px;border-radius:4px}.contact{font-size:20px;font-weight:600;overflow-wrap:anywhere}.link-row{display:flex;flex-wrap:wrap;gap:12px 28px;margin:28px 0}.footer{border-top:1px solid var(--line);padding:25px 0 32px;font-size:13px;color:var(--muted)}.footer-inner{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap}.footer p{margin:0}.footer a{color:var(--muted)}.toc{border-block:1px solid var(--line);padding:14px 0;margin:24px 0;display:flex;flex-wrap:wrap;gap:4px 20px;font-size:14px}strong{font-weight:650}dl{margin:20px 0}dt{font-weight:650;margin-top:15px}dd{margin:4px 0 18px;color:var(--muted)}
@media(max-width:720px){.shell{width:calc(100% - 32px)}.header-inner{align-items:flex-start;flex-direction:column;gap:10px;padding:20px 0 16px}.nav{gap:7px 20px}.main{padding-top:32px;padding-bottom:40px}.hero{grid-template-columns:1fr;gap:24px;padding-top:0}.clock-art{display:none}.facts{grid-template-columns:1fr;gap:0}.facts h2{margin-top:24px}.document{padding:25px 21px;border-radius:8px}.document h1{font-size:29px}.document h2{font-size:21px}.lead{font-size:17px}.note{padding:15px 17px}.footer-inner{flex-direction:column}body{font-size:15px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}