:root{color-scheme:dark;--background:#080d16;--surface:#101824;--surface-raised:#141f2c;--line:#253243;--text:#edf3fa;--muted:#a1afc1;--accent:#40d8ed;--radius:18px}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:28px}
body{margin:0;background:radial-gradient(ellipse at 88% 0,rgba(29,101,124,.13),transparent 38%),var(--background);color:var(--text);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;font-size:15px;line-height:1.75;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
a,summary{touch-action:manipulation}
a:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:5px}
button,a,summary{-webkit-tap-highlight-color:transparent}
h1,h2,h3,p{margin:0}
h1,h2,h3{line-height:1.3;overflow-wrap:anywhere}
p,li{overflow-wrap:break-word}
h1{max-width:900px;font-size:clamp(34px,4.5vw,60px);font-weight:680;letter-spacing:-.035em}
h2{font-size:24px;font-weight:650;letter-spacing:-.02em}
h3{font-size:20px;font-weight:620;letter-spacing:-.015em}
p{color:var(--muted)}
.site-header,main,.site-footer{width:min(100% - 80px,1200px);margin-inline:auto}
.site-header{display:flex;align-items:center;gap:36px;min-height:92px;border-bottom:1px solid var(--line);position:relative;z-index:10}
.brand{display:inline-flex;align-items:center;gap:9px;flex:none;font-size:23px;font-weight:750;letter-spacing:-.035em}
.brand-dot{width:6px;height:6px;border-radius:50%;background:var(--accent)}
.primary-nav{display:flex;align-items:center;gap:25px;flex:1;min-width:0}
.primary-nav a{font-size:14px;color:var(--muted);white-space:nowrap;padding:13px 0}
.primary-nav a:hover,.primary-nav a[aria-current=page]{color:var(--text)}
.primary-nav a[aria-current=page]{box-shadow:0 2px 0 var(--accent)}
.language-picker{position:relative;flex:none}
.language-picker>summary{display:flex;align-items:center;gap:15px;font-size:13px;color:var(--text);cursor:pointer;list-style:none;padding:9px 13px;border:1px solid var(--line);border-radius:10px}
.language-picker>summary::-webkit-details-marker{display:none}
.language-menu{position:absolute;top:calc(100% + 10px);right:0;width:180px;padding:8px;background:var(--surface-raised);border:1px solid var(--line);border-radius:12px;box-shadow:0 18px 60px #0008;display:grid;gap:2px}
.language-menu a{padding:7px 11px;border-radius:7px;font-size:13px;color:var(--muted)}
.language-menu a:hover,.language-menu a[aria-current=page]{background:#243344;color:var(--text)}
.page-hero{padding:72px 0 54px}
.eyebrow,.guide-label{display:block;color:var(--accent);font-size:12px;font-weight:650;letter-spacing:.05em;margin-bottom:15px}
.intro{max-width:720px;font-size:17px;line-height:1.85;margin-top:20px}
.hero-meta{display:flex;align-items:center;flex-wrap:wrap;gap:13px;margin-top:26px}
.feature-count{font-size:13px;color:var(--text);margin-right:9px}
.availability{display:inline-flex;align-items:center;gap:7px;max-width:100%;padding:4px 9px;border-radius:6px;border:1px solid #225061;background:#11323e77;color:#8ce3ed;font-size:11px;line-height:1.45;font-weight:550}
.availability:before{content:"";display:block;flex:none;width:5px;height:5px;border-radius:50%;background:currentColor}
.availability-desktop{color:#c6bddf;border-color:#48405f;background:#30283b77}
.directory-layout{display:grid;grid-template-columns:205px minmax(0,1fr);gap:48px;align-items:start}
.directory-sidebar{position:sticky;top:28px}
.sidebar-label{font-size:12px;color:#8394aa;letter-spacing:.03em;margin:0 12px 13px}
.group-nav{display:grid;gap:7px}
.group-nav a{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px;border:1px solid transparent;border-radius:10px;color:var(--muted);font-size:13px;line-height:1.5}
.group-nav a:hover{background:var(--surface);border-color:var(--line);color:var(--text)}
.nav-count{font-size:11px;color:#8193a7;font-variant-numeric:tabular-nums}
.directory-content{min-width:0}
.feature-group{scroll-margin-top:28px;margin-bottom:48px}
.section-heading{display:flex;align-items:baseline;justify-content:space-between;gap:20px;margin-bottom:21px}
.group-total{color:#8193a7;font-size:12px;border:1px solid var(--line);padding:2px 9px;border-radius:6px}
.feature-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.feature-card{display:flex;flex-direction:column;align-items:flex-start;gap:14px;padding:25px;background:linear-gradient(135deg,#121e2a66,#101824);border:1px solid var(--line);border-radius:var(--radius);transition:border-color .18s ease,background .18s ease}
.feature-card:hover{border-color:#387289;background:var(--surface-raised)}
.feature-card-top{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;width:100%;margin-bottom:5px}
.feature-symbol{display:grid;place-items:center;flex:none;width:32px;height:32px;border-radius:9px;background:#14384466;border:1px solid #27516066;color:var(--accent);font-size:20px}
.feature-card h3{font-size:19px}
.feature-card p{font-size:13px;line-height:1.85;flex:1}
.card-link{display:flex;align-items:center;gap:12px;color:#88cfda;font-size:12px;font-weight:550;margin-top:7px}
.card-link>span,.action>span,.text-link>span{font-size:16px;font-weight:400}
.guide-section{margin:48px 0}
.guide-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.guide-card,.explanation-card{display:flex;flex-direction:column;align-items:flex-start;gap:14px;padding:27px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}
.guide-card:hover{border-color:#387289}
.guide-card .guide-label{margin:0}
.guide-card p,.explanation-card p{font-size:14px;line-height:1.85;flex:1}
.mode-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.step-number{color:var(--accent);font-size:13px;font-variant-numeric:tabular-nums;letter-spacing:.05em}
.directory-intro{display:flex;align-items:center;justify-content:space-between;gap:32px;margin:56px 0;padding:32px 36px;border:1px solid #2a4959;border-radius:var(--radius);background:linear-gradient(110deg,#102330,#101824)}
.directory-intro>div{max-width:660px}
.directory-intro .guide-label{margin-bottom:9px}
.directory-intro p{font-size:14px;margin-top:12px}
.action{display:inline-flex;align-items:center;justify-content:center;gap:18px;flex:none;padding:12px 18px;border-radius:10px;background:var(--accent);color:#07141c;font-size:13px;line-height:1.5;font-weight:650;border:1px solid transparent}
.action:hover{background:#7ae4f3}
.action:focus-visible{outline-offset:4px}
.text-link{display:inline-flex;align-items:center;gap:10px;flex:none;color:#88cfda;font-size:13px}
.breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:10px;margin-bottom:20px;color:#8193a7;font-size:12px;line-height:1.6}
.breadcrumb a{color:#88cfda}
.feature-hero{padding-bottom:46px}
.feature-hero h1{font-size:clamp(32px,4vw,52px)}
.detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:36px;align-items:start}
.detail-main{min-width:0}
.feature-details{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.info-panel{padding:26px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}
.info-panel h2{font-size:19px;margin-bottom:18px}
.material-list{padding:0;list-style:none;margin:0;display:grid;gap:10px}
.material-list li{display:flex;align-items:baseline;gap:10px;color:#c7d3e1;font-size:14px}
.material-list li:before{content:"";width:5px;height:5px;border-radius:50%;background:#518298;flex:none;align-self:center}
.panel-note{font-size:12px;line-height:1.8;margin-top:20px;color:#8799b0}
.usage{position:sticky;top:28px;padding:26px;background:linear-gradient(145deg,#142635,#101824);border:1px solid #2b4658;border-radius:var(--radius)}
.usage .guide-label{margin-bottom:15px}
.usage p{font-size:13px;line-height:1.85;margin:18px 0 23px}
.usage .action{width:100%}
.usage .usage-hint{margin-bottom:0;font-size:12px;color:#8799b0}
.step-list{list-style:none;counter-reset:steps;padding:0;margin:0;display:grid;gap:0}
.step-list li{counter-increment:steps;position:relative;min-height:70px;padding:0 0 27px 54px;color:#b9c7d7;font-size:14px;line-height:1.9}
.step-list li:before{content:counter(steps,decimal-leading-zero);position:absolute;left:0;top:0;display:grid;place-items:center;width:32px;height:32px;color:var(--accent);font-size:12px;border:1px solid #2a4c5e;border-radius:9px;background:#11232f}
.step-list li:not(:last-child):after{content:"";position:absolute;width:1px;background:var(--line);left:16px;top:38px;bottom:7px}
.step-list li:last-child{padding-bottom:0;min-height:32px}
.faq-list{border-top:1px solid var(--line)}
.faq-list details{border-bottom:1px solid var(--line)}
.faq-list summary{position:relative;padding:19px 35px 19px 0;font-size:14px;font-weight:550;cursor:pointer;list-style:none}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary:after{content:"+";position:absolute;right:4px;top:16px;color:#91a7be;font-size:22px;font-weight:400}
.faq-list details[open] summary:after{content:"−"}
.faq-list details p{font-size:13px;line-height:1.9;margin:0 28px 19px 0}
.usage-notes{padding:24px 26px;border-radius:14px;border:1px solid var(--line);background:#0d1520}
.usage-notes h2{font-size:15px;margin-bottom:12px}
.usage-notes p{font-size:12px;line-height:1.9}
.usage-notes p+p{margin-top:8px}
.related-section{padding-top:48px;margin:54px 0 70px;border-top:1px solid var(--line)}
.related-section .feature-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
.site-footer{display:flex;align-items:center;gap:30px;flex-wrap:wrap;padding:30px 0 38px;border-top:1px solid var(--line)}
.site-footer .brand{font-size:18px}
.site-footer nav{display:flex;gap:24px;flex:1;font-size:12px;color:#8799b0}
.updated{color:#71849c;font-size:11px}
@media(max-width:1050px){.site-header{gap:25px}.primary-nav{gap:18px}.directory-layout{grid-template-columns:180px minmax(0,1fr);gap:26px}.detail-layout{grid-template-columns:minmax(0,1fr) 280px;gap:24px}.feature-details{grid-template-columns:1fr}.guide-grid{gap:16px}.guide-card,.explanation-card{padding:23px}}
@media(max-width:820px){.site-header,main,.site-footer{width:calc(100% - 48px)}.site-header{flex-wrap:wrap;gap:15px;padding:22px 0 0}.brand{flex:1}.language-picker{margin-left:auto}.primary-nav{order:3;flex-basis:100%;overflow-x:auto;gap:25px;padding-bottom:12px}.primary-nav a{padding:8px 0;flex:none}.page-hero{padding:46px 0 35px}.intro{font-size:15px}.directory-layout{display:block}.directory-sidebar{position:sticky;top:0;z-index:5;padding:12px 0 16px;background:var(--background);margin-bottom:22px;border-bottom:1px solid var(--line)}.sidebar-label{display:none}.group-nav{display:flex;gap:7px;overflow-x:auto;padding-bottom:4px;scrollbar-width:thin}.group-nav a{flex:none;padding:9px 12px;background:var(--surface);border-color:var(--line);font-size:12px}.nav-count{font-size:10px}.feature-group{margin-bottom:38px;scroll-margin-top:85px}.detail-layout{grid-template-columns:1fr}.usage{position:static;grid-row:1}.feature-details{grid-template-columns:repeat(2,minmax(0,1fr))}.guide-grid,.related-section .feature-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.directory-intro{padding:27px;align-items:flex-start;flex-direction:column;gap:22px}.section-heading h2{font-size:22px}.site-footer nav{flex-basis:100%;order:3}.site-footer{gap:16px}.updated{margin-left:auto}}
@media(max-width:540px){.site-header,main,.site-footer{width:calc(100% - 36px)}.brand{font-size:21px}.primary-nav{gap:20px}.primary-nav a{font-size:12px}.language-picker>summary{font-size:12px;padding:8px 10px}.page-hero{padding:37px 0 30px}h1{font-size:34px;letter-spacing:-.03em}.feature-hero h1{font-size:32px}.intro{font-size:14px;line-height:1.9;margin-top:17px}.hero-meta{gap:10px;margin-top:21px}.feature-count{flex-basis:100%;margin:0 0 2px}.feature-grid,.guide-grid,.mode-grid,.feature-details,.related-section .feature-grid{grid-template-columns:1fr}.feature-card{padding:23px;gap:13px}.feature-card h3{font-size:19px}.section-heading{gap:12px}.section-heading h2{font-size:21px}.guide-section{margin:36px 0}.section-heading .text-link{font-size:11px;white-space:nowrap}.related-section{margin-top:38px;padding-top:35px}.usage,.info-panel,.explanation-card,.guide-card{padding:23px}.directory-intro{margin:38px 0;padding:25px}.directory-intro h2{font-size:23px}.site-footer nav{gap:18px;flex-wrap:wrap}.updated{font-size:10px}.availability{font-size:10px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.feature-card{transition:none}}