*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--ink:#0a0a0c;--muted:#6e6f78;--paper:#f4f4f5;--white:#fff;--line:rgba(10,10,12,.1);--purple:#6e60ee;--shell:1280px}
html{scroll-behavior:smooth}
body{padding-top:64.5px;color:var(--ink);background:var(--white);font-family:Geist,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","PingFang SC","Hiragino Sans GB",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";line-height:1.65;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility;overflow-x:hidden}
a{color:inherit;text-decoration:none}button,input{font:inherit}
.shell{width:min(calc(100% - 48px),var(--shell));margin-inline:auto}
.site-header{height:64.5px;position:fixed;top:0;left:0;right:0;z-index:50;background:#fff;border-bottom:.5px solid rgba(0,0,0,.06);backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px)}
.site-header .shell{width:100%;margin:0;padding:18.25px 24px}.header-inner{height:28px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:32px}
.brand{display:flex;align-items:center;height:28px}.brand img{height:100%;width:auto;display:block}
.top-nav{display:inline-flex;justify-self:center;align-items:center;gap:4px;color:var(--muted)}.top-nav a{height:32px;padding:0 14px;display:inline-flex;align-items:center;justify-content:center;border-radius:999px;font-size:15px;font-weight:500;line-height:1;white-space:nowrap}.top-nav a:hover{color:var(--ink);background:rgba(0,0,0,.05)}
.header-actions{display:inline-flex;justify-self:end;align-items:center;justify-content:flex-end;gap:8px;color:#51525a;font-size:13px}.header-actions>a:first-child{width:104px;height:36px;display:inline-flex;align-items:center;justify-content:center;white-space:nowrap}.header-actions .button{width:112px;height:36px;min-height:36px;padding:0;border-radius:999px;white-space:nowrap;font-size:13px}
.button{min-height:42px;padding:0 19px;display:inline-flex;align-items:center;justify-content:center;border-radius:999px;font-size:11px;font-weight:650;transition:transform .2s,background .2s}
.button:hover{transform:translateY(-2px)}.button-dark{color:#fff;background:var(--ink)}.button-white{color:var(--ink);background:#fff}
.menu-button{display:none}
.lang-switch{width:76px;height:36px;padding:3px;display:inline-flex;gap:2px;background:#f0f0f2;border:1px solid #e4e4e7;border-radius:999px}
.lang-switch a{width:34px;height:28px;display:inline-flex;align-items:center;justify-content:center;padding:0;text-align:center;border-radius:999px;color:#777880;font-size:11px;font-weight:650;line-height:1}
.lang-switch a.active{color:#fff;background:var(--ink)}.mobile-lang{display:none}
.guide-hero{padding:108px 0 78px;text-align:left;background:linear-gradient(#fff,#f8f8f9)}
.hero-copy{display:flex;flex-direction:column;align-items:flex-start}
.hero-copy h1{max-width:1120px;font-size:clamp(48px,6vw,84px);line-height:.98;letter-spacing:-.06em;font-weight:650}
.hero-copy h1 em{display:block;margin-top:14px;color:#8c8f99;font-style:normal;font-weight:400;font-size:.72em;line-height:1.08}
.hero-copy p{max-width:760px;margin:30px 0 0;color:#6f7079;font-size:17px;line-height:1.75}
.reading-time{margin-top:24px;display:flex;align-items:center;color:#8a8b93;font:9px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.06em;text-transform:uppercase}
.reading-time::before{content:"";width:20px;height:1px;margin-right:10px;background:#b9bac1}
.scroll-link{display:inline-flex;align-items:center;gap:14px;margin-top:24px;padding-bottom:4px;border-bottom:1px solid #c9c9cf;color:#55565e;font-size:11px}
.hero-visual{padding:0 0 90px;background:#f8f8f9}
.intro-compare{margin-top:38px}.intro-compare .compare-result img{width:100%;max-width:none}
.step-compare{margin-top:28px;border-radius:14px;box-shadow:none}.step-compare .compare-result img{width:100%;max-width:none}
.intro-pair{margin-top:38px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));align-items:start;gap:14px}.intro-pair figure{min-width:0}.intro-pair img{width:100%;height:auto;display:block;border:1px solid #dedee2;border-radius:14px;background:#f3f3f5}.intro-pair figcaption{margin-top:9px;color:#777880;font:9px ui-monospace,SFMono-Regular,Menlo,monospace;text-transform:uppercase;letter-spacing:.07em;text-align:center}
.material-swap-pair{position:relative;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;align-items:start}.material-swatch-panel{width:108px;padding:0;position:absolute;z-index:4;left:50%;top:50%;transform:translate(-50%,-50%);border:0;background:transparent;box-shadow:none}.material-swatch-grid{display:grid;grid-template-columns:1fr;gap:14px}.material-swatch{padding:0;display:block;overflow:hidden;border:2px solid var(--purple);border-radius:8px;background:transparent;box-shadow:0 8px 16px rgba(110,96,238,.18)}.material-swatch img{width:100%;aspect-ratio:1;display:block;object-fit:cover;border:0;border-radius:0;background:transparent}
.material-reference-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:28px}.material-reference-row img{width:100%;aspect-ratio:1;display:block;object-fit:cover;border:1px solid #dedee2;border-radius:12px;background:#f3f3f5}
.compare{--pos:56%;width:100%;aspect-ratio:16/9;position:relative;overflow:hidden;border:1px solid #dedee2;border-radius:22px;box-shadow:0 35px 100px rgba(26,22,50,.15);background:#f3f3f5}
.compare>img,.compare-result img{width:100%;height:100%;display:block;object-fit:contain;pointer-events:none}
.compare-result{width:100%;position:absolute;inset:0;overflow:hidden;-webkit-clip-path:inset(0 calc(100% - var(--pos)) 0 0);clip-path:inset(0 calc(100% - var(--pos)) 0 0)}
.compare-result img{width:100%;max-width:none}
.compare-divider{width:1px;position:absolute;left:var(--pos);top:0;bottom:0;background:#fff}
.compare-knob{width:48px;height:48px;display:grid;place-items:center;position:absolute;left:var(--pos);top:50%;transform:translate(-50%,-50%);background:#fff;border:4px solid #111;border-radius:50%;font-size:13px;box-shadow:0 4px 20px #0006}
.compare input{width:100%;height:100%;position:absolute;inset:0;opacity:0;cursor:ew-resize}
.compare>b{padding:6px 9px;position:absolute;bottom:14px;color:#fff;background:#0a0a0ccc;border-radius:5px;font-size:9px}
.before-tag{left:14px}.after-tag{right:14px}
.guide-layout{padding:110px 0 130px;display:grid;grid-template-columns:240px minmax(0,820px);gap:10vw;align-items:start}
.contents-card{padding:23px;position:sticky;top:100px;border:1px solid var(--line);border-radius:14px;background:#fafafa}
.contents-card>p{margin-bottom:18px;color:#888991;font:9px ui-monospace,monospace;text-transform:uppercase;letter-spacing:.08em}
.contents-card ol{padding:0;list-style:none;counter-reset:toc}
.contents-card li{counter-increment:toc;border-top:1px solid var(--line)}
.contents-card a:not(.try-link){padding:12px 0;display:grid;grid-template-columns:28px minmax(0,1fr);align-items:center;color:#65666e;font-size:11px;line-height:20px}
.contents-card a:not(.try-link)::before{content:"0" counter(toc);color:#aaa;font:9px ui-monospace,monospace}
.contents-card a:hover{color:var(--ink)}
.try-link{margin-top:18px;padding:11px 14px;display:flex;align-items:center;justify-content:space-between;color:#fff;background:var(--ink);border-radius:999px;font-size:10px}
.article-section{padding:0 0 105px;margin-bottom:105px;border-bottom:1px solid var(--line);scroll-margin-top:100px}
.article-section:last-child{margin-bottom:0;border-bottom:0}
.section-label{display:flex;align-items:center;gap:11px;margin-bottom:25px;color:#8a8b93;font:9px ui-monospace,SFMono-Regular,Menlo,monospace;text-transform:uppercase;letter-spacing:.07em}
.section-label>span:first-child{width:29px;height:29px;display:grid;place-items:center;flex:0 0 auto;border:1px solid var(--line);border-radius:50%;font-size:8px}
.guide-content h2{font-size:clamp(36px,4.2vw,54px);line-height:1.1;letter-spacing:-.052em;font-weight:590}
.guide-content>section>p{margin-top:20px;color:#686972;font-size:14px;line-height:1.85}
.guide-content>section>.lead{color:var(--ink);font-size:21px;line-height:1.55;letter-spacing:-.025em}
.answer-card{margin:30px 0 2px!important;padding:22px 24px;display:grid;grid-template-columns:105px minmax(0,1fr);gap:18px;border:1px solid #ded8ff;border-radius:14px;background:#f3f1ff}
.answer-card strong{color:#5d4bdc;font:650 10px/1.7 ui-monospace,monospace;text-transform:uppercase;letter-spacing:.06em}
.answer-card>span{color:#3d394c;font-size:13px;line-height:1.8}
.fact-table-wrap{margin-top:32px;overflow:hidden;border:1px solid #e1e1e5;border-radius:14px}
.fact-table{width:100%;border-collapse:collapse;background:#fafafa}
.fact-table caption{padding:17px 20px;color:#242429;background:#f2f2f4;border-bottom:1px solid #e1e1e5;font-size:12px;font-weight:650;text-align:left}
.fact-table th,.fact-table td{padding:14px 20px;border-bottom:1px solid #e8e8eb;font-size:12px;line-height:1.55;text-align:left}
.fact-table tr:last-child th,.fact-table tr:last-child td{border-bottom:0}
.fact-table th{width:145px;color:#85858e;font:600 10px/1.55 ui-monospace,monospace;text-transform:uppercase;letter-spacing:.04em}
.fact-table td{color:#4f5058}
.definition-box{margin-top:34px;padding:24px 26px;background:#f4f4f5;border:1px solid #e4e4e7;border-radius:12px}
.definition-box>span{font-size:11px;font-weight:650}
.definition-box ul{margin:13px 0 0;padding:0;list-style:none}
.definition-box li{padding:7px 0;color:#66676f;font-size:12px}
.definition-box li::before{content:"✓";margin-right:9px;color:var(--purple)}
.source-quote{margin-top:28px;padding:22px 24px;border-left:3px solid var(--purple);background:#fafafa}
.source-quote p{color:#34343b;font-size:14px;line-height:1.75}
.source-quote cite{margin-top:9px;display:block;color:#8a8b93;font-size:10px;font-style:normal}
.source-note{margin-top:14px!important;color:#85868e!important;font-size:10px!important;line-height:1.7!important}
.source-note a,.source-quote a{text-decoration:underline;text-underline-offset:3px}
.callout{margin-top:22px;padding:20px 22px;display:grid;grid-template-columns:55px 1fr;gap:12px;background:#f3f1ff;border:1px solid #ded8ff;border-radius:11px}
.callout b{color:#5d4bdc;font-size:10px}.callout p{color:#68647b;font-size:11px;line-height:1.7}
.feature-visual{margin-top:28px;overflow:hidden;border:1px solid #e1e1e5;border-radius:14px;background:#f5f5f7}
.feature-visual img{width:100%;height:auto;display:block;background:#f5f5f7}
.step-interface-stack{display:grid;gap:18px;overflow:visible;background:transparent;border:0;box-shadow:none}
.step-interface-stack img{margin:0}
.asset-placeholder{width:100%;aspect-ratio:16/9;display:block;position:relative;overflow:hidden;border:1px dashed #c9c9d1!important;border-radius:14px;background:linear-gradient(135deg,#f7f7f9,#eeeef2)}
.asset-placeholder::before{content:"";width:48px;height:48px;position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);border:1px solid #d0d0d8;border-radius:9px;background:#e7e7ed}
.asset-placeholder-stack{display:grid;gap:18px;overflow:visible;background:transparent;border:0;box-shadow:none}
.asset-placeholder-stack .asset-placeholder{margin:0}
.step-block{padding-top:65px;margin-top:65px;border-top:1px solid var(--line)}
.step-index{width:36px;height:36px;display:grid;place-items:center;color:#fff;background:var(--ink);border-radius:50%;font:11px ui-monospace,monospace}
.step-copy h3{margin-top:18px;font-size:25px;letter-spacing:-.035em}
.step-copy p{margin-top:10px;color:#686972;font-size:13px;line-height:1.8}
.step-block figure{margin:28px 0 0}
.step-block figure img{width:100%;height:auto;display:block;border-radius:14px;background:#f5f5f7}
.step-block figcaption{margin-top:10px;color:#92939b;font-size:9px;text-align:center}
.results-grid{margin-top:28px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}
.results-grid img{width:100%;height:auto;display:block;border-radius:10px;background:#f5f5f7}
.case-gallery{margin-top:28px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.case-gallery figure{margin:0;overflow:hidden;border:1px solid #e1e1e5;border-radius:12px;background:#fafafa}
.case-gallery img{width:100%;height:auto;display:block;background:#f5f5f7}
.case-gallery figcaption{padding:10px 12px;color:#777880;font-size:10px}
.tips-list{margin-top:35px;border-top:1px solid var(--line)}
.tips-list article{padding:26px 0;display:grid;grid-template-columns:55px 1fr;border-bottom:1px solid var(--line);align-items:start}
.tips-list article>span{color:#999aa2;font:9px ui-monospace,monospace;line-height:24px}
.tips-list h3{font-size:17px;line-height:24px}.tips-list p{margin-top:6px;color:#6d6e76;font-size:12px;line-height:1.75}
.faq-list{margin-top:34px;border-top:1px solid var(--line)}
.faq-list details{border-bottom:1px solid var(--line)}
.faq-list summary{min-height:78px;display:flex;align-items:center;justify-content:space-between;gap:20px;cursor:pointer;list-style:none;font-size:14px;font-weight:550}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary span{font-size:20px;font-weight:300;transition:transform .2s}
.faq-list details[open] summary span{transform:rotate(45deg)}
.faq-list details p{margin:-3px 40px 27px 0;color:#6e6f77;font-size:12px;line-height:1.75}
.related-guides{padding:105px 0;background:#f4f4f5;border-top:1px solid var(--line)}
.related-head{display:flex;align-items:end;justify-content:space-between}
.related-head span{color:#8b8c94;font:9px ui-monospace,monospace;text-transform:uppercase;letter-spacing:.08em}
.related-head h2{margin-top:10px;font-size:38px;letter-spacing:-.045em}
.related-head>a{padding-bottom:3px;border-bottom:1px solid;color:#55565e;font-size:10px}
.related-grid{margin-top:38px;display:grid;grid-template-columns:repeat(3,1fr);gap:15px}
.related-grid>a{min-height:200px;padding:25px;display:flex;flex-direction:column;background:#fff;border:1px solid #e0e0e4;border-radius:14px;transition:transform .25s,border .25s}
.related-grid>a:hover{transform:translateY(-4px);border-color:#c6c6cd}
.related-grid span{color:#97989f;font:8px ui-monospace,monospace}
.related-grid h3{margin-top:28px;font-size:21px}.related-grid p{margin-top:9px;color:#70717a;font-size:11px;line-height:1.7}
.cta-section{min-height:420px;padding:90px 20px;display:grid;place-items:center;color:#fff;text-align:center;background:var(--purple)}
.cta-section>div{max-width:900px}
.cta-section .cta-brand{width:180px;height:auto;margin:0 auto 30px;display:block;filter:invert(1)}
.cta-section h2{font-size:clamp(28px,5vw,56px);line-height:1.05;letter-spacing:-.05em}
.cta-section p{margin:20px 0 31px;color:#dcd8ff;font-size:14px}
.landing-footer{position:relative;z-index:2;display:flex;flex-direction:column;background:#0a0a0a;color:#fff}
.landing-footer-inner{width:100%;max-width:1400px;margin:0 auto;padding:56px 32px 28px;display:flex;flex-direction:column}
.landing-footer-top{display:flex;justify-content:space-between;align-items:flex-start;gap:64px;padding-bottom:56px}
.landing-footer-cta{flex:1;max-width:540px}.landing-footer-headline{margin:0;font-size:clamp(28px,3.4vw,44px);font-weight:700;letter-spacing:-1px;line-height:1.05;color:#fff}
.landing-footer-newsletter-label{margin:28px 0 14px;font-size:clamp(18px,1.6vw,22px);font-weight:500;color:rgba(255,255,255,.6)}
.landing-footer-newsletter{display:flex;align-items:center;width:100%;max-width:440px;height:56px;padding:4px;border:2px solid #fff;border-radius:999px;background:#fff;overflow:hidden;transition:background-color 220ms ease,border-color 220ms ease}.landing-footer-newsletter:hover{background:rgba(255,255,255,.94)}.landing-footer-newsletter:focus-within{border-color:rgba(255,255,255,.6)}.landing-footer-newsletter-input{height:100%;min-width:0;flex:1;padding:0 18px;border:0;outline:0;color:#111;background:transparent;font-family:inherit;font-size:15px;font-weight:500}.landing-footer-newsletter-input::placeholder{color:rgba(0,0,0,.45)}.landing-footer-newsletter-submit{width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;flex:0 0 auto;border:0;border-radius:50%;color:#fff;background:#0a0a0a;font-size:18px;cursor:pointer;transition:transform 240ms cubic-bezier(.32,.72,0,1),background-color 220ms ease}.landing-footer-newsletter-submit:hover{transform:translateX(3px);background:#000}.landing-footer-newsletter-submit:active{transform:translateX(3px) scale(.96)}
.landing-footer-nav{display:flex;gap:56px;flex:0 0 auto}.landing-footer-col{display:flex;min-width:96px;flex-direction:column;gap:10px;margin:0;padding:0;list-style:none}.landing-footer-col-title{margin-bottom:4px;color:rgba(255,255,255,.45);font:600 11.5px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.6px;text-transform:uppercase}.landing-footer-col li a{color:#fff;font-size:15px;font-weight:500}.landing-footer-col li a:hover{opacity:.6}
.landing-footer-wordmark-row{margin-bottom:24px;padding:28px 0;border-top:.5px solid rgba(255,255,255,.12);border-bottom:.5px solid rgba(255,255,255,.12)}.landing-footer-wordmark{display:block;width:100%;color:#fff;font-size:clamp(80px,20vw,280px);font-weight:800;letter-spacing:-.04em;line-height:.9;text-align:center;white-space:nowrap;user-select:none}.landing-footer-wordmark-clip{display:inline-block;overflow:hidden;vertical-align:bottom;line-height:1}.landing-footer-wordmark-char{display:inline-block;will-change:transform;transform:translateY(110%);animation:wordmark-rise .7s cubic-bezier(.32,.72,0,1) forwards}
.landing-footer-bottom{display:flex;align-items:center;justify-content:space-between;font-size:13.5px}.landing-footer-copy{color:rgba(255,255,255,.45);font-weight:500}.landing-footer-bottom-right{display:flex;align-items:center;gap:18px}.landing-footer-privacy{color:#fff;font-weight:600}.landing-footer-privacy:hover{opacity:.6}
.landing-footer-lang{position:relative}.landing-footer-lang-btn{display:inline-flex;align-items:center;gap:8px;padding:8px 14px;border:.5px solid rgba(255,255,255,.16);border-radius:999px;color:#fff;background:rgba(255,255,255,.06);font-family:inherit;font-size:13px;font-weight:500;cursor:pointer}.landing-footer-lang-btn:hover{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.24)}.landing-footer-lang-btn svg{display:block;flex:0 0 auto}.landing-footer-lang-chev{transition:transform 200ms cubic-bezier(.32,.72,0,1)}
@keyframes wordmark-rise{to{transform:translateY(0)}}
@media(max-width:1000px){.header-inner{grid-template-columns:1fr auto}.top-nav{display:none}.guide-layout{grid-template-columns:190px minmax(0,1fr);gap:5vw}}
@media(max-width:760px){
.shell{width:min(calc(100% - 32px),var(--shell))}body{padding-top:64.5px}.site-header{height:64.5px}.site-header .shell{padding:18.25px 24px}.header-actions{display:none}
.menu-button{width:38px;height:38px;display:grid;align-content:center;gap:5px;border:0;background:transparent}
.menu-button i{width:20px;height:1px;background:#111}
.top-nav.is-open{padding:20px 16px;display:flex;position:absolute;left:0;right:0;top:64.5px;flex-direction:column;align-items:flex-start;background:#fff;border-bottom:1px solid var(--line)}
.top-nav .mobile-lang{display:block;padding-top:14px;margin-top:4px;width:100%;border-top:1px solid var(--line);color:var(--purple);font-weight:650}
.guide-hero{padding:52px 0 44px}.hero-copy h1{font-size:clamp(38px,10vw,52px);line-height:1;letter-spacing:-.055em}.hero-copy h1 em{margin-top:10px;font-size:.72em;line-height:1.08}.hero-copy p{margin-top:24px;font-size:14px}.reading-time{margin-top:24px}.scroll-link{margin-top:22px}
.compare{aspect-ratio:4/3;border-radius:14px}.compare-result img{width:100%;max-width:none}
.guide-layout{padding:75px 0 90px;display:block}.contents-card{position:static;margin-bottom:70px}
.article-section{padding-bottom:80px;margin-bottom:80px}.guide-content>section>.lead{font-size:18px}
.answer-card{grid-template-columns:1fr;gap:7px;padding:19px}
.material-swap-pair{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.material-swatch-panel{width:84px}.material-swatch-grid{gap:11px}.material-swatch{padding:0;border-radius:6px}.material-swatch img{border-radius:0}
.material-reference-row{gap:8px}.material-reference-row img{border-radius:9px}
.results-grid,.case-gallery{grid-template-columns:1fr}.tips-list article{grid-template-columns:38px 1fr}
.related-head{align-items:start;gap:25px;flex-direction:column}.related-grid{grid-template-columns:1fr}
}
@media(max-width:900px){.landing-footer{padding:56px 0 24px}.landing-footer-top{flex-direction:column;gap:40px;padding-bottom:40px}.landing-footer-nav{gap:36px;flex-wrap:wrap}}
@media(max-width:600px){.landing-footer-inner{padding:0 16px}.landing-footer-bottom{gap:8px;align-items:flex-start;flex-direction:column-reverse}.landing-footer-newsletter{height:50px}.landing-footer-newsletter-submit{width:38px;height:38px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition-duration:.01ms!important}}

/* Merge each guide introduction into its cover for one continuous first screen. */
body{padding-top:0}
.cover{position:relative;height:100svh;min-height:720px;overflow:hidden;background:#17171a}
.cover>img{display:block;width:100%;height:100%;object-fit:cover}
.cover::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,.34) 0%,rgba(0,0,0,.04) 34%,rgba(0,0,0,.16) 50%,rgba(0,0,0,.86) 100%);pointer-events:none}
.cover-placeholder{background:#17171a}
.cover-bar{position:absolute;z-index:2;top:0;left:0;right:0;display:flex;align-items:center;justify-content:space-between;padding:26px 40px;color:#fff}
.cover-bar img{width:124px;height:auto;filter:brightness(0) invert(1)}
.cover-back{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:500;letter-spacing:.02em;text-transform:uppercase;opacity:.85;transition:opacity .16s ease}
.cover-back:hover{opacity:1}
.cover-bar .i18n-zh{display:none}
html[lang="zh-CN"] .cover-bar .i18n-en{display:none}
html[lang="zh-CN"] .cover-bar .i18n-zh{display:inline}
.cover .guide-hero{position:absolute;z-index:2;right:0;bottom:0;left:0;padding:0 0 clamp(44px,7vh,78px);color:#fff;background:transparent}
.cover .hero-copy h1{max-width:1100px;color:#fff;text-shadow:0 2px 26px rgba(0,0,0,.28)}
.cover .hero-copy h1 em{color:rgba(255,255,255,.75)}
.cover .hero-copy p{max-width:760px;color:rgba(255,255,255,.8)}
.cover .hero-copy .reading-time{color:rgba(255,255,255,.68)}
.cover .hero-copy .reading-time::before{background:rgba(255,255,255,.52)}
.cover .hero-copy .scroll-link{color:#fff;border-bottom-color:rgba(255,255,255,.55)}
@media(max-width:900px){.cover-bar{padding:20px 24px}}
@media(max-width:760px){
.cover{min-height:680px}
.cover-bar{padding:18px 16px}
.cover .guide-hero{padding:0 0 34px}
.cover .hero-copy h1{font-size:clamp(34px,9vw,48px)}
.cover .hero-copy p{margin-top:18px;font-size:13px;line-height:1.55}
.cover .hero-copy .reading-time{margin-top:18px}
.cover .hero-copy .scroll-link{margin-top:17px}
}