:root{
 --brick:#B9473F;--amber:#D89A45;--ink:#1E2026;--paper:#F7F4EF;--soft:#EEE9E2;
 --text:#2B2D31;--muted:#6F706F;--orange:#E06A3B;--line:#D8D1C7;--white:#fff;--max:1180px;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--text);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.75;-webkit-font-smoothing:antialiased}
body.modal-open{overflow:hidden}img{display:block;max-width:100%;height:auto}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}
.container{width:min(calc(100% - 40px),var(--max));margin:auto}.sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
.skip-link{position:fixed;top:-60px;left:16px;z-index:999;padding:10px 16px;background:#fff;border:2px solid var(--brick);border-radius:9px}.skip-link:focus{top:16px}
h1,h2,h3,p{margin-top:0}h1,h2,h3{color:var(--ink);line-height:1.22}h1{font-size:clamp(2.35rem,5vw,4.8rem);letter-spacing:-.04em;margin-bottom:22px}h2{font-size:clamp(1.7rem,3vw,2.65rem);letter-spacing:-.025em;margin-bottom:16px}h3{font-size:1.25rem;margin-bottom:10px}p{margin-bottom:18px}
.eyebrow{margin:0 0 10px;color:var(--brick);font-size:.8rem;font-weight:900;letter-spacing:.12em;text-transform:uppercase}.lead,.hero-lead{font-size:clamp(1.06rem,1.8vw,1.26rem);color:#4d4e51;max-width:760px}
.button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:11px 20px;border:1px solid transparent;border-radius:999px;font-weight:800;transition:.2s}.button:hover{transform:translateY(-1px)}
.button-primary{background:var(--brick);color:#fff}.button-secondary{border-color:var(--ink);color:var(--ink)}.button-secondary:hover{background:var(--ink);color:#fff}.button-dark{background:var(--ink);color:#fff}.button-light{background:#fff;color:var(--ink)}.button-outline-light{border-color:rgba(255,255,255,.55);color:#fff}
.text-link{color:var(--brick);font-weight:800;text-decoration:underline;text-underline-offset:5px}
.site-header{position:sticky;top:0;z-index:100;background:rgba(247,244,239,.95);backdrop-filter:blur(16px);border-bottom:1px solid rgba(30,32,38,.08)}
.header-inner{width:min(calc(100% - 36px),1280px);min-height:76px;margin:auto;display:flex;align-items:center;gap:20px}.brand{display:flex;align-items:center;gap:11px}.brand img{width:44px;height:44px;object-fit:contain;border-radius:12px}.brand span{display:grid;line-height:1.15}.brand strong{color:var(--ink)}.brand small{margin-top:5px;color:var(--muted);font-size:.72rem}
.primary-nav{display:flex;gap:4px;margin-left:auto}.primary-nav a{padding:9px 10px;border-radius:9px;font-size:.88rem;font-weight:700;color:#55565a}.primary-nav a:hover,.primary-nav a[aria-current="page"]{background:var(--soft);color:var(--brick)}
.search-open{border:1px solid var(--ink);border-radius:999px;background:transparent;padding:9px 14px;font-weight:800}.nav-toggle{display:none;width:44px;height:44px;border:0;background:transparent}.nav-toggle i{display:block;height:2px;background:var(--ink);margin:5px 4px}
.search-modal[hidden]{display:none!important}.search-modal{position:fixed;inset:0;z-index:300;display:grid;place-items:start center;padding:12vh 20px}.search-modal__backdrop{position:absolute;inset:0;background:rgba(20,20,22,.68);backdrop-filter:blur(8px)}
.search-dialog{position:relative;width:min(680px,100%);padding:34px;background:var(--paper);border-radius:24px;box-shadow:0 40px 100px rgba(0,0,0,.35)}.search-close{position:absolute;right:18px;top:16px;width:42px;height:42px;border:0;border-radius:50%;background:var(--soft);font-size:1.7rem}
.search-form label,.home-search label,.inline-search label{display:block;font-weight:800;margin-bottom:8px}.search-form>div,.home-search>div,.inline-search>div{display:flex;gap:10px}
.search-form input,.home-search input,.inline-search input{min-width:0;flex:1;border:1px solid var(--line);background:#fff;border-radius:12px;padding:13px 14px;color:var(--ink);outline:0}.search-form input:focus,.home-search input:focus,.inline-search input:focus{border-color:var(--brick);box-shadow:0 0 0 3px rgba(185,71,63,.12)}
.search-form button,.home-search button,.inline-search button{border:0;border-radius:12px;padding:12px 18px;background:var(--brick);color:#fff;font-weight:800}

.home-hero{padding:76px 0 64px;overflow:hidden}.home-hero__grid{display:grid;grid-template-columns:1.05fr .95fr;gap:58px;align-items:center}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.hero-notes{display:flex;flex-wrap:wrap;gap:8px;margin-top:26px}.hero-notes span{padding:7px 11px;border:1px solid var(--line);border-radius:999px;color:var(--muted);font-size:.82rem}.hero-media{margin:0}.hero-media img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:28px;box-shadow:0 18px 50px rgba(30,32,38,.1)}.hero-media figcaption{margin-top:10px;color:var(--muted);font-size:.82rem}
.content-section{padding:84px 0}.section-soft{background:var(--soft)}.section-dark{background:var(--ink);color:#d8d7d5}.section-dark h2,.section-dark h3{color:#fff}.section-dark .eyebrow{color:#e7a35e}.section-amber{background:#e4b16a}
.section-heading{display:flex;justify-content:space-between;gap:40px;align-items:end;margin-bottom:30px}.section-heading>div{max-width:760px}.section-heading>p{max-width:420px;color:var(--muted);margin-bottom:4px}.inverse h2,.inverse p{color:#fff}
.quick-grid{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.quick-grid article{padding:28px;border-right:1px solid var(--line)}.quick-grid article:last-child{border-right:0}.quick-grid article>span{color:var(--brick);font-weight:900}.quick-grid h3{margin-top:36px}.quick-grid p{color:var(--muted)}.quick-grid a{color:var(--brick);font-weight:800}
.topic-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.topic-grid article{display:grid;grid-template-columns:210px 1fr;background:#292c33;border:1px solid rgba(255,255,255,.08);border-radius:18px;overflow:hidden}.topic-grid img{width:100%;height:100%;min-height:230px;object-fit:cover}.topic-grid article div{padding:24px}.topic-grid p{color:#c4c5c7}.topic-grid div>a{color:#f0b067;font-weight:800}
.feature-band{display:grid;grid-template-columns:.95fr 1.05fr;gap:58px;align-items:center}.feature-band figure{margin:0}.feature-band img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:22px}.numbered-steps{list-style:none;padding:0;margin:26px 0;counter-reset:step}.numbered-steps li{counter-increment:step;display:grid;grid-template-columns:42px 145px 1fr;padding:15px 0;border-top:1px solid var(--line)}.numbered-steps li:before{content:"0" counter(step);color:var(--brick);font-weight:900}.numbered-steps span{color:var(--muted)}
.article-list{border-top:1px solid var(--line)}.article-row{display:grid;grid-template-columns:140px minmax(0,1fr) 34px;gap:16px;align-items:start;padding:20px 0;border-bottom:1px solid var(--line)}.article-row>span:nth-child(2){display:grid;gap:5px}.article-row small{color:var(--muted);line-height:1.55}.article-category{color:var(--brick);font-size:.78rem;font-weight:900;letter-spacing:.06em}.article-row b{color:var(--brick)}
.split-layout{display:grid;grid-template-columns:1.3fr .7fr;gap:56px}.fact-panel{background:var(--ink);color:#d0d0d1;border-radius:20px;padding:32px}.fact-panel h3{color:#fff;font-size:1.7rem}.fact-panel a{color:#f0b067;font-weight:800}
.check-list{list-style:none;padding:0;margin:22px 0}.check-list li{position:relative;padding:9px 0 9px 28px;border-bottom:1px solid rgba(111,112,111,.2)}.check-list li:before{content:"";position:absolute;left:0;top:17px;width:10px;height:10px;border-radius:50%;background:var(--brick);box-shadow:0 0 0 4px rgba(185,71,63,.11)}
.comparison{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:26px 0}.comparison>div{padding:18px;border:1px solid rgba(30,32,38,.2);border-radius:14px;background:rgba(247,244,239,.35)}.comparison strong,.comparison span{display:block}.comparison span{font-size:.86rem;color:#5a4938;margin-top:4px}
.troubleshoot-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.troubleshoot-grid article{min-height:245px;padding:28px;border:1px solid var(--line);border-radius:18px}.troubleshoot-grid span{color:var(--brick);font-weight:900}.troubleshoot-grid h3{margin-top:40px}.troubleshoot-grid p{color:var(--muted)}.center-action{text-align:center;margin-top:28px}
.ai-band,.safety-band,.about-strip{display:grid;grid-template-columns:1.05fr .95fr;gap:54px;align-items:center}.ai-band img,.safety-band img,.about-strip img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:22px}.safety-band h2{color:#fff}.safety-band p{color:#d0d1d2}
.home-search{max-width:900px;padding:24px;background:var(--ink);border-radius:18px;color:#fff}.home-search input{background:#30333a;border-color:#454952;color:#fff}.home-search button{background:var(--amber);color:var(--ink)}.home-search p{color:#bfc0c2;font-size:.85rem;margin:10px 0 0}
.faq-preview details,.faq-list details{border-top:1px solid var(--line)}.faq-preview details:last-child,.faq-list details:last-child{border-bottom:1px solid var(--line)}.faq-preview summary,.faq-list summary{list-style:none;cursor:pointer;padding:20px 48px 20px 0;position:relative;font-weight:850;color:var(--ink)}.faq-preview summary::-webkit-details-marker,.faq-list summary::-webkit-details-marker{display:none}.faq-preview summary:after,.faq-list summary:after{content:"+";position:absolute;right:8px;font-size:1.45rem;color:var(--brick)}.faq-preview details[open] summary:after,.faq-list details[open] summary:after{content:"−"}.faq-preview details div,.faq-list details div{padding:0 50px 18px 0;color:var(--muted)}
.inline-links{display:flex;flex-wrap:wrap;gap:10px 18px}.inline-links a{color:var(--brick);font-weight:800;text-decoration:underline;text-underline-offset:4px}

.page-hero{padding:58px 0 66px;border-bottom:1px solid var(--line)}.page-hero__grid,.article-hero__grid{display:grid;grid-template-columns:1.1fr .75fr;gap:56px;align-items:center}.page-hero figure,.article-hero figure{margin:0}.page-hero figure img,.article-hero figure img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:22px}
.breadcrumbs{margin-bottom:24px}.breadcrumbs ol{display:flex;flex-wrap:wrap;gap:7px;list-style:none;padding:0;margin:0;color:var(--muted);font-size:.82rem}.breadcrumbs li:not(:last-child):after{content:"/";margin-left:7px;color:#aaa}
.reading-grid,.faq-layout,.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:64px}.editorial-block{position:relative;padding:0 0 46px 64px;border-bottom:1px solid var(--line);margin-bottom:44px}.section-index{position:absolute;left:0;top:4px;color:var(--brick);font-weight:900}.editorial-block p{color:#4d4e50}
.sticky{position:sticky;top:106px}.aside-panel{padding:24px;border:1px solid var(--line);border-radius:18px;background:rgba(255,255,255,.35)}.aside-panel h2{font-size:1.25rem}.aside-link{display:block;padding:12px 0;border-top:1px solid var(--line);font-size:.92rem;font-weight:750}.aside-link:hover{color:var(--brick)}
.split-callout{display:grid;grid-template-columns:1fr .9fr;gap:50px;align-items:center;padding:32px;border:1px solid var(--line);border-radius:18px;background:var(--soft)}
.article-hero{padding:54px 0 58px;border-bottom:1px solid var(--line)}.article-hero h1{font-size:clamp(2.2rem,4.2vw,4.1rem)}.article-meta{display:flex;flex-wrap:wrap;gap:10px 18px;color:var(--muted);font-size:.82rem}.article-layout{padding-top:68px;padding-bottom:76px}.article-content{font-size:1.03rem}.article-content section{margin-bottom:48px}.article-content h2{font-size:2rem}.article-content p{max-width:790px;color:#434548}.article-note{padding:28px;border-left:4px solid var(--brick);background:var(--soft)}
.search-page-hero{padding:56px 0 46px;background:var(--soft);border-bottom:1px solid var(--line)}.compact-search{margin-top:28px;padding:20px}.search-results{min-height:420px}.result-list{border-top:1px solid var(--line)}.result-list article{padding:24px 0;border-bottom:1px solid var(--line)}.result-list article>span{font-size:.76rem;color:var(--brick);font-weight:900}.result-list h2{font-size:1.45rem;margin:6px 0}.result-list p{color:var(--muted)}.empty-state{padding:40px;border:1px dashed #bcb5ab;border-radius:18px}
.error-panel{padding:90px 0;min-height:64vh;display:grid;align-items:center}.error-panel__grid{display:grid;grid-template-columns:1fr .9fr;gap:68px}.error-panel h1{font-size:clamp(3rem,8vw,7rem)}.error-links{border-top:1px solid var(--line)}.error-links a{display:block;padding:18px 0;border-bottom:1px solid var(--line)}.error-links strong,.error-links span{display:block}.error-links span{color:var(--muted);font-size:.88rem}
.site-footer{padding:62px 0 22px;background:#17191e;color:#bfc0c2}.footer-grid{width:min(calc(100% - 40px),var(--max));margin:auto;display:grid;grid-template-columns:1.5fr repeat(3,.7fr);gap:42px;padding-bottom:42px}.footer-grid h2{font-size:.92rem;color:#fff}.footer-grid a{display:block;padding:6px 0;font-size:.88rem}.footer-brand{display:flex;gap:14px}.footer-brand img{border-radius:14px}.footer-brand strong{color:#fff}.footer-brand p{font-size:.86rem;max-width:360px}.footer-bottom{width:min(calc(100% - 40px),var(--max));margin:auto;display:flex;justify-content:space-between;gap:20px;padding-top:20px;border-top:1px solid rgba(255,255,255,.1);font-size:.8rem}.footer-bottom p{margin:0}
.reveal-ready{opacity:0;transform:translateY(12px);transition:opacity .5s ease,transform .5s ease}.reveal-ready.reveal-visible{opacity:1;transform:none}

@media(max-width:1200px){.primary-nav a{padding-inline:8px;font-size:.84rem}.header-inner{gap:12px}.reading-grid,.faq-layout,.article-layout{grid-template-columns:minmax(0,1fr) 285px;gap:42px}}
@media(max-width:1024px){.header-inner{min-height:70px}.brand small{display:none}.nav-toggle{display:block;margin-left:auto}.search-open{display:none}.primary-nav{display:none;position:absolute;top:70px;left:18px;right:18px;margin:0;padding:12px;background:var(--paper);border:1px solid var(--line);border-radius:16px;box-shadow:0 18px 50px rgba(30,32,38,.12)}.primary-nav.is-open{display:grid}.primary-nav a{padding:12px}.home-hero__grid,.page-hero__grid,.article-hero__grid{grid-template-columns:1fr}.quick-grid{grid-template-columns:1fr}.quick-grid article{border-right:0;border-bottom:1px solid var(--line)}.topic-grid{grid-template-columns:1fr}.feature-band,.ai-band,.safety-band,.about-strip,.split-layout{grid-template-columns:1fr}.reading-grid,.faq-layout,.article-layout{grid-template-columns:1fr}.sticky{position:static}.aside-panel{display:grid;grid-template-columns:1fr 1fr;gap:0 18px}.aside-panel .eyebrow,.aside-panel h2{grid-column:1/-1}.footer-grid{grid-template-columns:1.4fr 1fr 1fr}.footer-brand{grid-column:1/-1}}
@media(max-width:768px){.container{width:min(calc(100% - 28px),var(--max))}.home-hero{padding:46px 0}.content-section{padding:60px 0}.section-heading{display:block}.section-heading>p{margin-top:10px}.topic-grid article{grid-template-columns:1fr}.troubleshoot-grid{grid-template-columns:1fr}.numbered-steps li{grid-template-columns:36px 1fr}.numbered-steps span{grid-column:2}.article-row{grid-template-columns:1fr 28px;gap:7px 12px}.article-row .article-category{grid-column:1/-1}.editorial-block{padding-left:0}.section-index{position:static;display:block;margin-bottom:8px}.comparison{grid-template-columns:1fr}.split-callout{grid-template-columns:1fr}.error-panel__grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}.footer-bottom{flex-direction:column}}
@media(max-width:600px){.header-inner{width:calc(100% - 24px)}.search-dialog{padding:28px 20px}.search-form>div,.home-search>div,.inline-search>div{display:grid}.hero-actions{display:grid}.hero-actions .button{width:100%}.aside-panel{grid-template-columns:1fr}.aside-panel .eyebrow,.aside-panel h2{grid-column:auto}.article-content h2{font-size:1.65rem}.footer-grid{grid-template-columns:1fr}}
@media(max-width:375px){.container{width:calc(100% - 22px)}.content-section{padding:50px 0}.quick-grid article{padding:22px}.home-search{padding:18px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}