:root{color-scheme:light;--ink:#203238;--muted:#657476;--paper:#f5f5ef;--line:#d6ddda;--accent:#4c526e;--wash:#ececf4;--good:#20674f;--bad:#a33f30;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-synthesis:none}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;color:var(--ink);background:var(--paper);line-height:1.65}body.geo{--accent:#1b655d;--wash:#e6eeea}a{color:var(--accent);text-underline-offset:4px}a:hover{color:var(--ink)}button,input,select,textarea{font:inherit}button,.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--accent);color:white;border:1px solid var(--accent);border-radius:5px;padding:9px 15px;line-height:1.4;cursor:pointer;text-decoration:none;font-weight:600;font-size:14px;min-height:40px}button:hover,.button:hover{filter:brightness(.94);color:white}button.secondary,.button.secondary{background:white;color:var(--accent);border-color:var(--line)}button:disabled{opacity:.45;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,[tabindex]:focus-visible{outline:3px solid #b78335;outline-offset:3px}input,select,textarea{border:1px solid #b8c6c3;border-radius:4px;background:#fff;color:var(--ink);max-width:100%;padding:8px 10px}input[type=number]{width:135px}input[type=checkbox]{accent-color:var(--accent)}input[type=file]{width:100%;font-size:12px;padding:7px}textarea{font:12px/1.6 ui-monospace,SFMono-Regular,Consolas,monospace;width:100%;min-height:260px;resize:vertical;tab-size:2}label{display:block;font-size:13px;font-weight:600;margin-bottom:7px}h1,h2,h3,p{margin-top:0}h1{font-family:Georgia,"Noto Serif SC",serif;font-size:clamp(34px,4.8vw,62px);line-height:1.1;letter-spacing:-.025em;font-weight:500;margin-bottom:20px;max-width:950px}html[lang^=zh] h1{font-family:inherit;font-size:clamp(32px,4vw,48px);line-height:1.3;font-weight:650}h2{font-size:23px;letter-spacing:-.02em;line-height:1.35}h3{font-size:17px}p{margin-bottom:14px}.skip{position:absolute;top:-100px;left:20px;background:white;padding:10px;z-index:10}.skip:focus{top:10px}.topbar{border-bottom:1px solid var(--line);background:rgba(245,245,239,.97);position:sticky;top:0;z-index:5}.topbar-inner{max-width:1440px;padding:15px 40px;margin:auto;display:flex;align-items:center;gap:24px}.brand{text-decoration:none;color:var(--ink);display:flex;align-items:center;gap:12px;font-weight:700;font-size:14px;white-space:nowrap}.brand-mark{display:grid;place-items:center;width:32px;height:32px;background:var(--accent);color:white;font:17px Georgia,serif;border-radius:4px}.top-nav{display:flex;gap:22px;margin-left:auto;align-items:center;flex-wrap:wrap}.top-nav a{font-size:13px;text-decoration:none;color:var(--muted)}.top-nav a[aria-current=page]{color:var(--accent);font-weight:700}.top-nav .language{border-left:1px solid var(--line);padding-left:20px;color:var(--ink)}.wrap{max-width:1440px;margin:auto;padding:0 40px}.hero{padding:48px 0 30px;position:relative}.kicker{font-size:10px;letter-spacing:.13em;text-transform:uppercase;font-weight:700;color:var(--muted)}.eyebrow{font-size:11px;letter-spacing:.15em;text-transform:uppercase;color:var(--accent);font-weight:700;margin-bottom:18px;display:flex;gap:15px;align-items:center}.eyebrow:before{content:'';width:24px;height:1px;background:var(--accent)}.hero .intro{color:var(--muted);font-size:17px;max-width:770px;line-height:1.8}.hero-foot{display:flex;flex-wrap:wrap;gap:12px 24px;font-size:12px;color:var(--muted);margin-top:23px}.hero-foot span:before{content:'●';font-size:7px;color:var(--accent);margin-right:8px}.workbench{border-top:1px solid var(--ink);padding-top:20px}.section-line{display:flex;gap:12px;align-items:center;justify-content:space-between;margin-bottom:16px}.section-line h2{margin:0;font-size:18px}.section-line .kicker{font-size:10px}.workspace{display:grid;grid-template-columns:310px minmax(0,1fr);gap:22px;align-items:start}.panel{background:white;border:1px solid var(--line);border-radius:7px;padding:20px;min-width:0}.panel h3{margin-bottom:6px}.hint,small{font-size:12px;color:var(--muted);line-height:1.7}.hint{margin-bottom:15px}.actions{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}.actions button{font-size:12px;padding:8px 11px}.spaced{margin-top:18px}.file-label{margin-top:18px}.status{font-size:13px;min-height:27px;color:var(--accent);padding:5px 0;overflow-wrap:anywhere}.status.error{color:var(--bad)}.metrics{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-bottom:18px}.metric{border:1px solid var(--line);border-radius:5px;padding:15px;background:white;display:flex;flex-direction:column;gap:3px;min-width:0}.metric strong{font-size:30px;line-height:1.3;font-weight:550;letter-spacing:-.03em}.metric small{font-size:10px}.result-area{min-width:0}.table-scroll{overflow:auto;max-height:430px;border:1px solid var(--line);border-radius:4px;margin:12px 0}table{border-collapse:collapse;width:100%;font-size:12px;line-height:1.5;text-align:left;white-space:nowrap}th{background:var(--wash);font-size:10px;text-transform:uppercase;letter-spacing:.05em;position:sticky;top:0}th,td{padding:11px 12px;border-bottom:1px solid var(--line)}tr:last-child td{border-bottom:0}td button{font-size:11px;padding:4px 8px;min-height:28px}td .badge{white-space:nowrap}.badge{display:inline-flex;padding:3px 7px;font-size:10px;font-weight:650;border-radius:3px;background:var(--wash);color:var(--accent)}.badge.good{color:var(--good);background:#e5f0e7}.badge.bad{color:var(--bad);background:#f8e9e4}.comparison-note{font-size:12px;color:var(--muted);padding:11px 14px;background:var(--wash);border-radius:4px;margin-bottom:14px}.switches{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin:12px 0}.switches label{margin:0;display:flex;gap:7px;align-items:center;font-weight:400;font-size:12px}.switches select{font-size:12px;max-width:170px}.timeline{list-style:none;padding:0;margin:15px 0}.timeline li{border-left:2px solid var(--line);padding:0 0 18px 15px;position:relative}.timeline li:before{content:'';position:absolute;width:7px;height:7px;background:var(--accent);border-radius:50%;left:-4.5px;top:7px}.timeline .step-head{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:12px}.timebar{height:6px;background:var(--wash);margin:8px 0;border-radius:3px;overflow:hidden}.timebar span{height:100%;display:block;background:var(--accent)}details{font-size:12px}summary{cursor:pointer;color:var(--accent)}pre{font:11px/1.65 ui-monospace,SFMono-Regular,Consolas,monospace;background:#f4f6f4;padding:12px;overflow:auto;max-height:280px;white-space:pre-wrap;overflow-wrap:anywhere;border-radius:4px}code{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:.88em;background:#e9eeea;padding:2px 4px;border-radius:3px}.tabs{display:flex;gap:5px;flex-wrap:wrap;padding:5px;background:var(--wash);border-radius:5px;margin-bottom:15px}.tabs button{background:transparent;color:var(--accent);border:0;font-size:12px;flex:1;min-height:38px;padding:8px}.tabs button[aria-selected=true]{background:white;box-shadow:0 1px 3px #0001}.canvas-wrap{border:1px solid var(--line);border-radius:5px;overflow:hidden;background:#fafbf9;position:relative;margin:12px 0}.canvas-wrap canvas{display:block;width:100%;height:340px;touch-action:manipulation;cursor:crosshair}.plot-caption{padding:8px 12px;background:var(--wash);font-size:10px;color:var(--muted);display:flex;justify-content:space-between;gap:10px}.coordinate-form{display:flex;gap:10px;flex-wrap:wrap;align-items:end}.coordinate-form label{font-size:11px;margin:0}.coordinate-form input{width:130px;font-size:12px}.empty{font-size:13px;color:var(--muted);padding:20px 0}.reading-links{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin:30px 0 50px}.reading-card{padding:24px;border:1px solid var(--line);border-radius:5px;text-decoration:none;color:var(--ink);background:transparent}.reading-card:hover{background:white}.reading-card h3{margin:7px 0}.reading-card p{margin:0;font-size:13px;color:var(--muted)}.article{max-width:950px;margin:0 auto;padding:38px 0 60px}.article .lead{font-size:18px;color:var(--muted);max-width:800px}.article section{padding:22px 0;border-top:1px solid var(--line)}.article p,.article li{font-size:15px;line-height:1.9}.article li{margin-bottom:8px}.article h2{margin:8px 0 15px}.article .toc{display:flex;gap:18px;flex-wrap:wrap;font-size:13px;margin:30px 0}.article .table-scroll{max-height:none}.article th,.article td{white-space:normal}.callout{border-left:3px solid var(--accent);padding:14px 18px;background:var(--wash);font-size:13px;margin:18px 0}.site-footer{border-top:1px solid var(--line);padding:24px 0;color:var(--muted);font-size:11px}.footer-inner{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}.site-footer a{text-decoration:none}.hidden,[hidden]{display:none!important}.muted{color:var(--muted)}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
@media(min-width:1600px){.hero{padding-top:65px}.workspace{grid-template-columns:340px minmax(0,1fr)}}
@media(max-width:1000px){.topbar-inner{padding:14px 24px}.wrap{padding:0 24px}.workspace{grid-template-columns:270px minmax(0,1fr)}.panel{padding:16px}.top-nav{gap:13px}.brand{font-size:12px}.metric{padding:12px}.metrics{gap:8px}.metric strong{font-size:25px}}
@media(max-width:760px){.topbar{position:static}.topbar-inner{padding:14px 18px;flex-wrap:wrap;gap:12px}.top-nav{width:100%;margin:0;gap:17px}.top-nav .language{margin-left:auto;padding-left:12px}.wrap{padding:0 18px}.hero{padding:32px 0 25px}.hero .intro{font-size:15px}.workspace{grid-template-columns:1fr}.input-panel textarea{min-height:170px;max-height:270px}.metrics{gap:7px}.metric{padding:11px 9px}.metric .kicker{font-size:9px;letter-spacing:.05em}.metric strong{font-size:25px}.metric small{font-size:9px}.panel{padding:16px}.reading-links{grid-template-columns:1fr;gap:12px;margin-top:22px}.section-line .kicker{max-width:150px;text-align:right}.canvas-wrap canvas{height:290px}.article{padding-top:28px}.article p,.article li{font-size:14px}.article .toc{gap:12px}.switches select{max-width:140px}.hero-foot{gap:8px 15px}.plot-caption{flex-wrap:wrap}.coordinate-form input{width:115px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}