/* Roboto, designed by Christian Robertson. Apache-2.0 license: roboto-license.c71d239df917.txt */
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:root{color-scheme:light;--orange:#dc5f00;--orange-dark:#a94700;--orange-soft:#fff4ea;--ink:#202327;--text:#35383d;--muted:#62666c;--line:#dcdee0;--wash:#f5f6f6;--paper:#fff;--header-height:72px;--width:1240px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-height) + 28px);-webkit-text-size-adjust:100%;scrollbar-color:#b1b5b9 #f5f6f6}
body{margin:0;color:var(--ink);background:var(--paper);font:16px/1.8 'Microsoft YaHei','PingFang SC',sans-serif;-webkit-font-smoothing:antialiased}html[lang=en] body{font-family:Roboto,Arial,sans-serif}
a{color:inherit;text-decoration:none;text-underline-offset:5px}button,input,summary{font:inherit}button,summary{cursor:pointer}a,button,summary{-webkit-tap-highlight-color:transparent}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible{outline:3px solid var(--orange);outline-offset:5px}::selection{background:#f7d7be;color:var(--ink)}input{caret-color:var(--orange)}
.shell{width:min(var(--width),calc(100% - 96px));margin-inline:auto}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;margin:-1px;padding:0;border:0}[hidden]{display:none!important}
h1,h2,h3,h4{margin:0;text-wrap:balance}p{margin:0;text-wrap:pretty}.quality-icon{width:28px;height:28px;flex:none}.chapter-icon{width:58px;height:58px;flex:none;color:var(--orange-dark)}.arrow-icon{width:20px;height:20px;flex:none}
.skip{position:fixed;top:10px;left:16px;z-index:200;padding:10px 20px;background:var(--ink);color:white;transform:translateY(-180%)}.skip:focus{transform:translateY(0)}
.topbar{position:sticky;top:0;z-index:60;background:var(--paper);border-bottom:1px solid transparent;transition:border-color .18s}.topbar.is-scrolled{border-color:var(--line)}
.header-inner{width:min(1440px,calc(100% - 80px));min-height:var(--header-height);display:flex;align-items:center;gap:32px;margin:auto}.brand-link{min-height:44px;display:flex;align-items:center;flex:none}.logo{width:102px;height:auto;display:block}
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.reading-progress{position:absolute;bottom:-1px;left:0;width:100%;height:2px;border:0;appearance:none;background:transparent;pointer-events:none}.reading-progress::-webkit-progress-bar{background:transparent}.reading-progress::-webkit-progress-value{background:var(--orange)}.reading-progress::-moz-progress-bar{background:var(--orange)}
.hero{padding:80px 0 64px}.hero>.shell{display:grid;grid-template-columns:minmax(0,1fr) 340px;column-gap:64px;align-items:center}.hero h1{font-size:clamp(48px,6.6vw,88px);line-height:1.1;font-weight:800;letter-spacing:-.03em;margin-bottom:36px}.title-tail,.title-bridge{display:block}.title-tail>span{display:inline-block;padding-bottom:10px;border-bottom:7px solid var(--orange)}
.hero-copy{max-width:690px;color:var(--muted)}.hero-copy p{font-size:17px;line-height:1.95}.hero-copy p+p{margin-top:16px}.hero-copy strong{color:var(--ink);font-weight:700}.calibration{margin:0;min-width:0}.calibration>svg{width:100%;height:auto;display:block}.calibration figcaption{font-size:12px;color:var(--muted);margin-top:8px}.calibration-metrics{display:flex;gap:24px;margin-top:24px}.calibration-metrics p{flex:1}.calibration-metrics span{display:block;font-size:12px;color:var(--muted)}.calibration-metrics strong{font:600 28px/1.5 Roboto,Arial,sans-serif;font-variant-numeric:tabular-nums}
.facts{grid-column:1/-1;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));margin-top:56px;padding-top:28px;border-top:1px solid var(--line)}.fact{padding-right:24px}.fact+.fact{padding-left:28px;border-left:1px solid var(--line)}.fact-number{display:flex;align-items:baseline;flex-wrap:wrap;gap:6px;line-height:1.2}.fact strong{font:600 46px/1.2 Roboto,Arial,sans-serif;letter-spacing:-.03em;font-variant-numeric:tabular-nums}.fact em{font-style:normal;font-size:14px;color:var(--orange-dark)}.fact-label{display:block;margin-top:10px;color:var(--muted);font-size:12px}
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@media(min-width:1800px){:root{--width:1360px}.hero>.shell{column-gap:100px}.criteria-table{font-size:17px}}
@media(max-width:1250px){.header-inner{width:calc(100% - 48px);gap:20px}.desktop-nav{gap:18px}.header-tools{gap:10px}.hero>.shell{grid-template-columns:minmax(0,1fr) 280px;gap:32px}.hero h1{font-size:68px}.criteria-table th,.criteria-table td{padding:20px}}
@media(max-width:1120px){.desktop-nav{display:none}.header-inner{justify-content:space-between}.mobile-nav{display:block}.mobile-nav summary{list-style:none;min-width:44px;min-height:44px;display:flex;align-items:center;justify-content:center;gap:8px;font-size:13px}.mobile-nav summary::-webkit-details-marker{display:none}.menu-icon{width:22px;height:22px}.mobile-nav-panel{position:absolute;top:100%;left:0;right:0;padding:24px 32px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px 24px;background:var(--paper);border-bottom:1px solid var(--line)}.mobile-nav-panel a{min-height:48px;white-space:normal}.hero h1{font-size:60px}.calibration-metrics{gap:16px}}
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@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important}}
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/* English: continuous dark opening, then an editorial index and chapter rail. */
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.overview>.shell{display:grid;grid-template-columns:320px minmax(0,1fr);gap:80px}.overview-heading{padding-top:8px}.overview-heading .section-heading{font-size:42px;line-height:1.15;max-width:300px}.overview-list{margin:0}.overview-card{padding:24px 0;border-bottom:1px solid var(--line);align-items:flex-start;gap:24px}.overview-card:first-child{padding-top:0}.overview-card>.quality-icon{color:var(--ink)}.overview-copy{display:grid;grid-template-columns:minmax(0,1fr) 120px;gap:8px 24px}.overview-card h3{grid-column:1;font-size:23px;line-height:1.3}.overview-card p{grid-column:1;margin:0;max-width:450px;font-size:15px;line-height:1.7}.test-count{white-space:nowrap;grid-column:2;grid-row:1/3;align-self:center;justify-content:flex-end;font-size:12px;gap:12px;margin:0}
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@media(max-width:1250px){.hero>.shell{column-gap:48px;grid-template-columns:minmax(0,1fr) 260px}.hero h1{font-size:76px}.overview>.shell{grid-template-columns:260px minmax(0,1fr);gap:48px}.category-layout{grid-template-columns:210px minmax(0,1fr);gap:32px}.criteria-table th,.criteria-table td{padding:18px 16px}.category-head h2{font-size:28px}.desktop-nav{gap:16px}}
@media(max-width:1120px){.mobile-nav-panel{background:#202327;border-color:#55585d}.hero h1{font-size:64px}.category-layout{display:block}.category-lead{position:static;margin-bottom:36px}.category-head{display:flex;gap:24px;align-items:flex-start}.chapter-icon{margin:0}.category-head h2{font-size:36px;max-width:700px}.chapter-nav{display:flex;gap:8px 24px;margin-top:16px}.overview>.shell{gap:40px;grid-template-columns:240px minmax(0,1fr)}.overview-heading .section-heading{font-size:36px}.overview-card h3{font-size:21px}.overview-copy{grid-template-columns:minmax(0,1fr) 108px;gap:8px 12px}.test-count{gap:8px}}
@media(max-width:800px){.hero{padding:44px 0 40px}.hero>.shell{grid-template-columns:1fr;gap:0}.hero h1{font-size:clamp(48px,9.5vw,72px);line-height:1.04}.hero-copy p{font-size:16px;line-height:1.75}.calibration{margin-top:32px;align-self:auto}.calibration-metrics{display:flex;margin-top:8px}.calibration-metrics p+p{margin:0}.calibration-metrics strong{font-size:22px}.facts{margin-top:28px}.fact strong{font-size:32px}.fact em{font-size:12px}.overview>.shell{display:block}.overview-heading .section-heading{font-size:36px;max-width:340px}.overview-heading .section-intro{max-width:520px}.overview-list{margin-top:32px}.overview-card{gap:16px;padding:24px 0}.overview-card h3{font-size:20px}.overview-copy{grid-template-columns:1fr;gap:8px}.overview-card p{font-size:14px}.test-count{grid-column:1;grid-row:auto;justify-content:flex-start;margin-top:6px}.category-head h2{font-size:32px}.chapter-icon{width:40px;height:40px}.category-head{gap:20px}.category-lead{margin-bottom:28px}.category-meta{font-size:12px}.chapter-nav a{font-size:12px}.dimension-heading{font-size:20px}.criterion-card h4{font-size:18px;line-height:1.4;padding-top:20px}.criterion-card dd{line-height:1.75}.criterion-spec{padding-top:12px}.group-benefit{background:#faf6f2;line-height:1.75}.category-summary{font-size:18px}.closing>.shell{display:block}.closing .section-heading{font-size:38px;max-width:340px}.closing p{font-size:17px;margin-top:24px}.footer-title{font-size:20px}}
@media(max-width:380px){.hero h1{font-size:44px}.hero-copy p{font-size:15px}.fact strong{font-size:30px}.fact em{font-size:11px}.overview-heading .section-heading{font-size:32px}.category-head h2{font-size:28px}}

/* 分享采用紧凑的图标组；复制动作以细分隔线和文字区分。 */
.share{gap:16px;flex-wrap:nowrap}.share-label{margin:0;font-size:13px;white-space:nowrap}.share-actions{display:flex;align-items:center;gap:4px}.share a,.share button{border:0;background:transparent;border-radius:0;min-height:44px;font-size:13px;transition:background .18s,color .18s}.share a{width:44px;padding:12px;border-radius:50%}.share a:hover{background:var(--wash);color:var(--orange-dark)}.share-icon{width:18px;height:18px;display:block;flex:none}.share button{gap:8px;padding:0 0 0 20px;margin-left:12px;border-left:1px solid var(--line)}.share button:hover span{text-decoration:underline;text-underline-offset:5px}
@media(max-width:800px){.share{display:block;margin-top:28px}.share-label{display:block;margin-bottom:10px}.share-actions{margin-left:-12px}.share button{padding-left:16px;margin-left:8px}}