/* Base */
:root{--brand:#B9473F;--amber:#D89A45;--dark:#1E2026;--paper:#F7F4EF;--soft:#EEE9E2;--text:#2B2D31;--muted:#6F706F;--accent:#E06A3B;--line:#D8D2CA;--white:#fff;--radius:22px;--shadow:0 18px 50px rgba(30,32,38,.08);--max:1180px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;line-height:1.75}img{max-width:100%;height:auto;display:block}a{color:inherit;text-decoration:none}a:hover{color:var(--brand)}button,input{font:inherit}.container{width:min(calc(100% - 40px),var(--max));margin-inline:auto}.narrow{width:min(100%,860px);margin-inline:auto}.center{text-align:center}.skip-link{position:fixed;left:20px;top:-60px;z-index:9999;background:var(--dark);color:#fff;padding:10px 14px;border-radius:8px}.skip-link:focus{top:14px}.topline{background:var(--dark);color:#ddd;font-size:13px}.topline-inner{min-height:34px;display:flex;align-items:center;justify-content:space-between;gap:20px}.topline p{margin:0}.topline a{color:#fff}.site-header{position:relative;z-index:50;background:rgba(247,244,239,.97);border-bottom:1px solid var(--line)}.header-main{min-height:92px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:12px}.brand img{width:52px;height:52px;object-fit:contain}.brand-copy{display:flex;flex-direction:column;line-height:1.2}.brand-copy strong{font-size:20px;color:var(--dark)}.brand-copy small{margin-top:5px;color:var(--muted)}.header-actions{display:flex;gap:10px}.icon-button,.menu-toggle,.dialog-close,.back-top{border:0;cursor:pointer}.icon-button,.menu-toggle{display:flex;align-items:center;gap:7px;background:var(--soft);color:var(--dark);padding:10px 14px;border-radius:999px}.menu-toggle{display:none}.primary-nav{border-top:1px solid rgba(216,210,202,.75)}.nav-scroll{display:flex;gap:8px;overflow-x:auto;scrollbar-width:none}.nav-scroll::-webkit-scrollbar{display:none}.nav-link{position:relative;white-space:nowrap;padding:15px 14px;color:#4e4f53;font-size:15px}.nav-link:after{content:"";position:absolute;height:3px;left:14px;right:14px;bottom:0;background:transparent;border-radius:3px}.nav-link:hover,.nav-link.is-active{color:var(--brand)}.nav-link.is-active:after{background:var(--brand)}
/* Search dialog */
.search-modal[hidden]{display:none!important}.search-modal{position:fixed;inset:0;z-index:1000;background:rgba(30,32,38,.62);display:grid;place-items:start center;padding:12vh 20px 30px}.search-dialog{width:min(680px,100%);background:var(--paper);border-radius:24px;box-shadow:0 30px 100px rgba(0,0,0,.28);padding:26px}.search-dialog-head{display:flex;justify-content:space-between;align-items:center;gap:20px}.search-dialog-head h2{margin:0;font-size:26px}.dialog-close{width:42px;height:42px;border-radius:50%;background:var(--soft);font-size:28px;line-height:1}.search-form label{display:block;font-weight:700;margin:18px 0 8px}.search-row{display:flex;gap:10px}.search-row input{min-width:0;flex:1;border:1px solid #cfc8c0;background:#fff;border-radius:12px;padding:13px 15px;outline:none}.search-row input:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(185,71,63,.12)}.search-row button{border:0;border-radius:12px;background:var(--brand);color:#fff;padding:0 20px;cursor:pointer}.search-hint{font-size:14px;color:var(--muted);margin:14px 0 0}
/* Common */
.hero{padding:56px 0 34px}.hero-grid,.page-hero-grid,.feature-grid,.image-copy-grid,.safe-grid,.deep-grid{display:grid;grid-template-columns:minmax(0,1.06fr) minmax(360px,.94fr);gap:48px;align-items:center}.eyebrow,.section-kicker{margin:0 0 10px;color:var(--brand);font-weight:800;letter-spacing:.08em;font-size:13px;text-transform:uppercase}.hero h1,.page-hero h1{font-size:clamp(38px,5vw,64px);line-height:1.13;letter-spacing:-.03em;margin:0;color:var(--dark)}.hero-lead{font-size:19px;line-height:1.8;color:#55565b;margin:22px 0 0}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.center-actions{justify-content:center}.button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 20px;border-radius:12px;font-weight:800}.button-primary{background:var(--brand);color:#fff}.button-primary:hover{background:#9e3832;color:#fff}.button-secondary{border:1px solid #cbc3bb;background:#fff;color:var(--dark)}.button-secondary:hover{border-color:var(--brand);color:var(--brand)}.button-light{background:#fff;color:var(--dark)}.button-light:hover{color:var(--brand)}.hero-points{display:flex;flex-wrap:wrap;gap:10px 22px;margin:26px 0 0;padding:0;list-style:none;color:#626368;font-size:14px}.hero-points li:before{content:"•";color:var(--accent);font-weight:900;margin-right:8px}.hero-media{margin:0;position:relative}.hero-media img,.page-hero img,.feature-grid>figure img,.image-copy-grid>img,.deep-grid>img,.safe-grid>img{border-radius:var(--radius);box-shadow:var(--shadow);object-fit:cover;aspect-ratio:4/3;background:var(--soft)}.hero-media figcaption{position:absolute;left:18px;right:18px;bottom:16px;background:rgba(30,32,38,.88);color:#fff;padding:12px 14px;border-radius:12px;font-size:13px}.section{padding:72px 0}.section-soft{background:var(--soft)}.section-deep,.feature-band{background:var(--dark);color:#eaeaea}.feature-band{background:#2b2d31}.section-deep h2,.feature-band h2{color:#fff}.section-intro .narrow{border-left:4px solid var(--brand);padding-left:26px}.section-intro h2,.section-heading h2,.feature-grid h2,.image-copy-grid h2,.deep-grid h2,.safe-grid h2,.closing-section h2{font-size:clamp(30px,4vw,46px);line-height:1.2;letter-spacing:-.02em;margin:0 0 20px;color:var(--dark)}.section-intro p{font-size:17px}.section-heading{margin-bottom:30px}.split-heading{display:flex;align-items:end;justify-content:space-between;gap:30px}.split-heading>p{max-width:450px;color:var(--muted)}.entrance-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.entrance-card{background:#fff;border:1px solid #ddd6ce;border-radius:18px;padding:26px;min-height:235px;display:flex;flex-direction:column}.card-index{font-weight:900;color:var(--amber);font-size:14px}.entrance-card h3{font-size:23px;margin:10px 0 8px}.entrance-card p{color:var(--muted);margin:0 0 18px}.entrance-card a{margin-top:auto;color:var(--brand);font-weight:800}.feature-grid figure{margin:0}.feature-grid .section-kicker,.deep-grid .section-kicker{color:#f0ad58}.definition-list{display:grid;gap:12px}.definition-list>div{padding:15px 0;border-top:1px solid rgba(255,255,255,.14)}.definition-list h3{margin:0 0 4px;color:#fff;font-size:18px}.definition-list p{margin:0;color:#c8c8c8}.text-link{display:inline-block;margin-top:18px;font-weight:800;color:var(--brand)}.feature-band .text-link{color:#f0ad58}.editorial-list{border-top:1px solid var(--line)}.editorial-row{display:grid;grid-template-columns:120px minmax(0,1fr) 180px;gap:22px;align-items:center;padding:22px 0;border-bottom:1px solid var(--line)}.status-label{font-size:12px;font-weight:800;color:var(--brand);background:#f0dedb;padding:6px 10px;border-radius:999px;justify-self:start}.editorial-row h3{margin:0 0 5px;font-size:20px}.editorial-row p{margin:0;color:var(--muted)}.editorial-row>a{text-align:right;font-weight:800;color:var(--brand)}.deep-grid p{color:#cbcbd0}.two-column-content{display:grid;grid-template-columns:1fr 1fr;gap:20px}.content-panel{background:var(--paper);border:1px solid #d8d0c7;border-radius:18px;padding:28px}.content-panel h3{font-size:24px;margin:0 0 10px}.content-panel p{color:var(--muted)}.content-panel a{font-weight:800;color:var(--brand)}.image-copy-grid p,.safe-grid p{color:#5f6064}.faq-preview{display:grid;grid-template-columns:1fr 1fr;gap:14px}.faq-preview details,.faq-page-list details{background:#fff;border:1px solid #dbd4cc;border-radius:14px;padding:0 18px}.faq-preview summary,.faq-page-list summary{cursor:pointer;font-weight:800;padding:18px 32px 18px 0;position:relative}.faq-preview summary:after,.faq-page-list summary:after{content:"+";position:absolute;right:0;top:16px;color:var(--brand);font-size:22px}.faq-preview details[open] summary:after,.faq-page-list details[open] summary:after{content:"–"}.faq-preview p{color:var(--muted);margin:0 0 18px}.inline-links{display:flex;gap:18px;flex-wrap:wrap}.inline-links a{font-weight:800;color:var(--brand)}.closing-section{border-top:1px solid var(--line)}
/* Page hero and article */
.page-hero{padding:48px 0 36px;border-bottom:1px solid var(--line)}.page-hero h1{font-size:clamp(36px,4.7vw,58px)}.page-hero-grid{grid-template-columns:minmax(0,1.1fr) minmax(330px,.9fr)}.accent-hero{background:#f1e8df}.dark-hero{background:var(--dark);color:#eee;border-bottom:0}.dark-hero h1{color:#fff}.dark-hero .hero-lead{color:#cfcfd2}.dark-hero .breadcrumbs,.dark-hero .breadcrumbs a{color:#bdbdc1}.breadcrumbs{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:25px;color:var(--muted);font-size:14px}.breadcrumbs a{color:#66676b}.breadcrumb-sep{opacity:.5}.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:56px;align-items:start}.article-body{min-width:0}.article-body h2{font-size:30px;line-height:1.3;margin:46px 0 14px;color:var(--dark)}.article-body h2:first-child{margin-top:0}.article-body p{font-size:16.5px;color:#44464a}.article-body a{color:var(--brand);text-decoration:underline;text-underline-offset:3px}.callout{margin:24px 0;padding:18px 20px;background:#efe3db;border-left:4px solid var(--accent);border-radius:0 12px 12px 0}.article-aside{display:grid;gap:16px;position:sticky;top:20px}.aside-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px}.aside-card h2{font-size:20px;margin:0 0 14px}.accent-card{background:#f0e1da}.check-list,.link-list,.detail-list{margin:0;padding-left:20px}.check-list li,.link-list li,.detail-list li{margin:8px 0}.link-list{list-style:none;padding:0}.link-list li{border-bottom:1px solid #eee8e1;padding:10px 0;margin:0}.link-list li:last-child{border-bottom:0}.link-list a{color:var(--brand);font-weight:700}.aside-media img{border-radius:12px;margin-bottom:12px;aspect-ratio:4/3;object-fit:cover}.aside-media p{color:var(--muted)}.aside-media a{color:var(--brand);font-weight:800}.domain-box{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin:24px 0;padding:18px 20px;background:var(--dark);color:#fff;border-radius:14px}.domain-box span{color:#bcbcc1}.domain-box strong{font-size:20px}.domain-box a{margin-left:auto;color:#f1b264;text-decoration:none}.number-list{padding-left:23px}.number-list li{padding:6px 0 6px 4px}.mini-steps{padding-left:22px}.mini-steps li{margin:7px 0}.device-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.device-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:26px}.device-icon{font-size:36px;color:var(--brand)}.device-card h2{margin:8px 0 8px;font-size:24px}.device-card p,.device-card li{color:var(--muted)}.device-card ul{padding-left:19px}.compare-table{border:1px solid var(--line);border-radius:14px;overflow:hidden;margin:22px 0}.compare-row{display:grid;grid-template-columns:1.1fr 1fr 1fr}.compare-row span{padding:13px 15px;border-right:1px solid var(--line);border-top:1px solid var(--line)}.compare-row span:last-child{border-right:0}.compare-row:first-child span{border-top:0}.compare-head{font-weight:800;background:var(--soft)}.timeline{max-width:900px;margin:auto;display:grid;gap:0}.timeline-item{display:grid;grid-template-columns:70px 1fr;gap:20px;position:relative}.timeline-item:before{content:"";position:absolute;left:34px;top:48px;bottom:-2px;width:1px;background:var(--line)}.timeline-item:last-child:before{display:none}.timeline-item>span{width:70px;height:70px;border-radius:50%;display:grid;place-items:center;background:var(--dark);color:#fff;font-weight:900}.timeline-item>div{padding:4px 0 36px}.timeline-item h2{margin:0 0 8px;font-size:26px}.timeline-item p{margin:0;color:var(--muted)}.faq-page-list{display:grid;gap:12px}.faq-page-list details{padding:0 22px}.faq-page-list summary{font-size:18px;padding:21px 34px 21px 0}.faq-answer{padding:0 0 20px;color:var(--muted)}.faq-answer p{margin:0}.topic-links-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.topic-links-grid a{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:18px}.topic-links-grid strong,.topic-links-grid span{display:block}.topic-links-grid strong{color:var(--dark)}.topic-links-grid span{color:var(--muted);font-size:14px;margin-top:5px}.feedback-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.feedback-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:28px}.feedback-card>span{font-weight:900;color:var(--amber)}.feedback-card h2{font-size:25px;margin:8px 0}.feedback-card p{color:var(--muted);margin-bottom:0}
/* Search / 404 */
.search-page-head{padding:54px 0 28px;background:var(--soft);border-bottom:1px solid var(--line)}.search-page-head h1{font-size:44px;margin:0}.page-search-form{margin-top:24px}.result-count{font-weight:800;color:var(--muted)}.search-results{display:grid;gap:15px}.search-results article{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px}.search-results h2{font-size:22px;margin:0 0 7px}.search-results h2 a{color:var(--dark)}.search-results p{margin:0;color:var(--muted)}.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.tag-row span{background:var(--soft);color:#6a655f;border-radius:999px;padding:5px 9px;font-size:12px}.empty-state{padding:34px;border:1px dashed #c8c0b8;border-radius:16px;text-align:center}.empty-state h2{margin-top:0}.compact-topics{margin-top:34px}.not-found{padding:90px 0}.error-code{font-size:86px;line-height:1;font-weight:900;color:var(--brand);margin:0 0 12px}.not-found h1{font-size:42px;margin:0 0 12px}
/* Footer */
.site-footer{background:var(--dark);color:#c8c8cc;padding:58px 0 24px}.footer-grid{display:grid;grid-template-columns:1.35fr repeat(3,1fr);gap:34px}.site-footer h2{color:#fff;font-size:18px;margin:0 0 14px}.site-footer p{margin:0;color:#aeb0b5}.site-footer ul{list-style:none;margin:0;padding:0}.site-footer li{margin:8px 0}.site-footer a{color:#d6d7d9}.site-footer a:hover{color:#f0ad58}.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:34px;padding-top:20px;display:flex;justify-content:space-between;gap:30px;font-size:13px}.back-top{position:fixed;right:22px;bottom:22px;width:46px;height:46px;border-radius:50%;background:var(--brand);color:#fff;box-shadow:var(--shadow);font-size:21px;z-index:30}.back-top[hidden]{display:none}
/* Responsive */
@media(max-width:1024px){.hero-grid,.page-hero-grid,.feature-grid,.image-copy-grid,.safe-grid,.deep-grid{grid-template-columns:1fr 1fr;gap:30px}.article-layout{grid-template-columns:minmax(0,1fr) 280px;gap:34px}.footer-grid{grid-template-columns:1.3fr 1fr 1fr}.footer-grid section:last-child{grid-column:2/4}.device-grid{grid-template-columns:1fr 1fr}.topic-links-grid{grid-template-columns:1fr 1fr}}
@media(max-width:768px){.container{width:min(calc(100% - 28px),var(--max))}.topline{display:none}.header-main{min-height:76px}.brand img{width:44px;height:44px}.brand-copy strong{font-size:18px}.brand-copy small{font-size:11px}.menu-toggle{display:flex}.primary-nav{display:none}.primary-nav.is-open{display:block}.nav-scroll{flex-direction:column;gap:0;padding:8px 14px 14px}.nav-link{padding:11px 4px}.nav-link:after{display:none}.button-label{display:none}.hero,.page-hero{padding-top:34px}.hero-grid,.page-hero-grid,.feature-grid,.image-copy-grid,.safe-grid,.deep-grid{grid-template-columns:1fr}.hero h1,.page-hero h1{font-size:40px}.hero-media{order:-1}.hero-media figcaption{position:static;margin-top:8px;background:none;color:var(--muted);padding:0}.section{padding:54px 0}.section-intro .narrow{padding-left:18px}.section-intro h2,.section-heading h2,.feature-grid h2,.image-copy-grid h2,.deep-grid h2,.safe-grid h2,.closing-section h2{font-size:34px}.entrance-grid,.two-column-content,.faq-preview,.feedback-grid{grid-template-columns:1fr}.split-heading{display:block}.editorial-row{grid-template-columns:1fr;gap:9px}.editorial-row>a{text-align:left}.article-layout{grid-template-columns:1fr}.article-aside{position:static;grid-template-columns:1fr 1fr}.device-grid{grid-template-columns:1fr}.compare-row{grid-template-columns:1fr}.compare-row span{border-right:0}.compare-row span:first-child{font-weight:800;background:#f7f4ef}.footer-grid{grid-template-columns:1fr 1fr}.footer-grid section:last-child{grid-column:auto}.footer-bottom{display:block}.footer-bottom p+p{margin-top:7px}}
@media(max-width:600px){.container{width:min(calc(100% - 22px),var(--max))}.hero h1,.page-hero h1{font-size:34px}.hero-lead{font-size:17px}.hero-actions{flex-direction:column}.button{width:100%}.entrance-card,.content-panel,.feedback-card{padding:21px}.article-body h2{font-size:26px}.article-aside{grid-template-columns:1fr}.topic-links-grid{grid-template-columns:1fr}.search-row{flex-direction:column}.search-row button{min-height:46px}.search-dialog{padding:20px}.timeline-item{grid-template-columns:54px 1fr;gap:14px}.timeline-item>span{width:54px;height:54px}.timeline-item:before{left:26px;top:40px}.footer-grid{grid-template-columns:1fr}.footer-bottom{font-size:12px}.page-hero img{order:-1}.not-found{padding:60px 0}.error-code{font-size:68px}}
@media(max-width:375px){.brand-copy small{display:none}.hero h1,.page-hero h1{font-size:31px}.section{padding:46px 0}.section-heading h2,.section-intro h2,.feature-grid h2,.image-copy-grid h2,.deep-grid h2,.safe-grid h2,.closing-section h2{font-size:30px}.article-body h2{font-size:24px}.hero-points{display:block}.hero-points li{margin:7px 0}}