:root{
  --brand:#B9473F;
  --amber:#D89A45;
  --ink:#1E2026;
  --bg:#F7F4EF;
  --soft:#EEE9E2;
  --text:#2B2D31;
  --muted:#6F706F;
  --accent:#E06A3B;
  --white:#FFFFFF;
  --line:#D8D1C8;
  --shadow:0 18px 50px rgba(30,32,38,.09);
  --radius:22px;
  --radius-sm:14px;
  --max:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:"Noto Sans SC","Microsoft YaHei",Arial,sans-serif;line-height:1.72;-webkit-font-smoothing:antialiased}
body.modal-open{overflow:hidden}
a{color:inherit;text-decoration:none}
a:hover{color:var(--brand)}
img{display:block;max-width:100%;height:auto}
button,input{font:inherit}
button{cursor:pointer}
.shell{width:min(var(--max),calc(100% - 40px));margin-inline:auto}
.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip-link{position:fixed;left:16px;top:-60px;z-index:1000;background:var(--ink);color:#fff;padding:10px 14px;border-radius:8px}
.skip-link:focus{top:16px;color:#fff}
.site-header{position:sticky;top:0;z-index:50;background:rgba(247,244,239,.96);border-bottom:1px solid rgba(216,209,200,.88);backdrop-filter:blur(12px)}
.header-row{min-height:76px;display:flex;align-items:center;gap:26px}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;color:var(--ink);white-space:nowrap}
.brand img{width:44px;height:44px;object-fit:contain}
.primary-nav{display:flex;align-items:center;gap:6px;margin-left:auto}
.primary-nav a{padding:10px 11px;border-radius:999px;font-size:14px;color:#46484e;transition:.2s ease}
.primary-nav a:hover,.primary-nav a[aria-current="page"]{background:var(--soft);color:var(--brand)}
.search-open,.menu-toggle{border:1px solid var(--line);background:transparent;color:var(--ink);border-radius:999px;padding:9px 14px}
.search-open:hover,.menu-toggle:hover{border-color:var(--brand);color:var(--brand)}
.menu-toggle{display:none}
.site-main{min-height:65vh}
.eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--brand);font-size:13px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;margin-bottom:10px}
.eyebrow::before{content:"";width:22px;height:2px;background:currentColor}
.eyebrow--light{color:#f0c07b}
.hero{display:grid;grid-template-columns:1.05fr .95fr;gap:54px;align-items:center;padding-block:76px 58px}
.hero__copy h1,.page-hero h1{margin:0;color:var(--ink);font-size:clamp(38px,5vw,68px);line-height:1.1;letter-spacing:-.035em}
.hero__copy>p{font-size:18px;color:#57595f;max-width:700px;margin:24px 0}
.hero__actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 17px;border-radius:999px;border:1px solid transparent;font-weight:750;transition:.2s ease}
.button:hover{transform:translateY(-1px)}
.button--primary{background:var(--brand);color:#fff}.button--primary:hover{color:#fff;background:#9e3b35}
.button--secondary{background:var(--ink);color:#fff}.button--secondary:hover{color:#fff;background:#343740}
.button--ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.button--amber{background:var(--amber);color:var(--ink)}.button--amber:hover{color:var(--ink);background:#e3ad63}
.hero__meta{display:flex;flex-wrap:wrap;gap:10px 20px;margin-top:22px;color:var(--muted);font-size:13px}
.hero__meta span{display:flex;align-items:center;gap:8px}.hero__meta span::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--accent)}
.hero__media{margin:0;position:relative}.hero__media img{width:100%;aspect-ratio:1/1.03;object-fit:cover;border-radius:32px;box-shadow:var(--shadow)}
.hero__media::after{content:"";position:absolute;inset:auto -14px -14px auto;width:38%;height:38%;border:2px solid var(--amber);border-radius:24px;z-index:-1}
.section{padding-block:64px}
.section--soft{background:var(--soft)}
.section--dark{background:var(--ink);color:#f6f2eb}
.section-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:40px;margin-bottom:30px}
.section-heading>div{max-width:720px}.section-heading h2,.intro-strip h2,.editorial-row h2,.topic-band h2,.split-guide h2,.about-callout h2,.content-prose h2,.side-panel h2,.fact-panel h2,.article-body h2,.article-side h2{margin:0;color:var(--ink);font-size:clamp(27px,3vw,42px);line-height:1.18;letter-spacing:-.02em}
.section-heading>p{max-width:420px;margin:0;color:var(--muted)}
.section-heading--light h2{color:#fff}
.intro-strip{display:grid;grid-template-columns:.9fr 1.1fr;gap:70px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.intro-strip p{margin:28px 0 0;color:#5a5c62}
.feature-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.feature-card{display:grid;grid-template-columns:140px 1fr;gap:20px;background:#fff;border:1px solid #e5ded5;border-radius:var(--radius);padding:16px;min-height:185px}
.feature-card img{width:140px;height:100%;min-height:150px;object-fit:cover;border-radius:15px}
.feature-card h3{margin:7px 0 8px;color:var(--ink);font-size:21px}.feature-card p{margin:0 0 14px;color:var(--muted);font-size:14px}.text-link{display:inline-flex;align-items:center;gap:8px;color:var(--brand);font-weight:760}.text-link::after{content:"→"}
.split-feature{display:grid;grid-template-columns:1fr .9fr;align-items:center;gap:60px}.split-feature h2{margin:0 0 18px;color:#fff;font-size:42px;line-height:1.16}.split-feature p{color:#c7c5c0}.split-feature figure{margin:0}.split-feature img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:28px}
.check-list{display:grid;gap:10px;padding:0;margin:24px 0 28px;list-style:none}.check-list li{position:relative;padding-left:26px;color:#e7e2da}.check-list li::before{content:"✓";position:absolute;left:0;color:var(--amber);font-weight:900}.check-list--plain li{color:var(--text)}
.article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.article-grid--wide{grid-template-columns:repeat(2,1fr)}
.article-card{background:#fff;border:1px solid #e6ded4;border-radius:var(--radius);overflow:hidden;box-shadow:0 10px 30px rgba(30,32,38,.04)}
.article-card__media{display:block;overflow:hidden}.article-card__media img{width:100%;aspect-ratio:16/10;object-fit:cover;transition:transform .35s ease}.article-card:hover .article-card__media img{transform:scale(1.025)}
.article-card__body{padding:22px}.article-card h3{margin:0 0 10px;font-size:21px;line-height:1.35;color:var(--ink)}.article-card p{margin:0 0 16px;color:var(--muted);font-size:14px}.article-card .eyebrow{font-size:11px}
.editorial-row{display:grid;grid-template-columns:.85fr 1.15fr;gap:54px;align-items:center}.editorial-row--reverse{grid-template-columns:1.05fr .95fr}.editorial-row figure{margin:0}.editorial-row img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:26px}.editorial-row p{color:#5e6066}.section--dark .editorial-row h2{color:#fff}.section--dark .editorial-row p{color:#cac6bf}
.inline-links{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}.inline-links a{border-bottom:1px solid currentColor;color:var(--brand);font-weight:720}
.steps{counter-reset:step;display:grid;grid-template-columns:repeat(4,1fr);gap:16px;padding:0;margin:28px 0;list-style:none}.steps li{background:#fff;border:1px solid #ddd4ca;border-radius:20px;padding:22px;min-height:170px}.steps strong{display:block;color:var(--ink);font-size:18px;margin-bottom:8px}.steps strong::before{counter-increment:step;content:"0" counter(step) " ";color:var(--brand)}.steps span{color:var(--muted);font-size:14px}.steps--dark li{background:#292c33;border-color:#3d4048}.steps--dark strong{color:#fff}.steps--dark span{color:#c8c5bf}.steps--dark strong::before{color:var(--amber)}
.topic-band{display:grid;grid-template-columns:.75fr 1.25fr;gap:44px;align-items:start}.topic-band__intro{position:sticky;top:110px}.topic-band__intro p{color:var(--muted)}.topic-band__list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.topic-band__list article{background:#fff;border:1px solid #e3dcd3;padding:22px;border-radius:18px}.topic-band__list h3{margin:0 0 8px}.topic-band__list p{margin:0 0 12px;color:var(--muted);font-size:14px}.topic-band__list span{font-size:12px;color:var(--brand);font-weight:800}
.split-guide{display:grid;grid-template-columns:1fr .85fr;gap:56px;align-items:center}.split-guide figure{margin:0}.split-guide img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:26px}.mini-index{display:grid;gap:10px;margin-top:24px}.mini-index a{display:grid;grid-template-columns:160px 1fr;gap:18px;padding:15px 0;border-bottom:1px solid var(--line)}.mini-index strong{color:var(--ink)}.mini-index span{color:var(--muted)}
.faq-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.faq-grid details,.faq-list details{background:#fff;border:1px solid #e1d9d0;border-radius:16px;padding:18px 20px}.faq-grid summary,.faq-list summary{cursor:pointer;font-weight:780;color:var(--ink)}.faq-grid p,.faq-list p{color:var(--muted)}
.about-callout{display:grid;grid-template-columns:.75fr 1.25fr;gap:48px;align-items:center}.about-callout img{width:100%;aspect-ratio:5/4;object-fit:cover;border-radius:24px}.about-callout p{color:var(--muted)}
.site-footer{background:#191b20;color:#d3d0ca;margin-top:40px}.footer-grid{display:grid;grid-template-columns:1.3fr repeat(3,1fr);gap:42px;padding-block:58px}.footer-grid h2{color:#fff;font-size:16px;margin:0 0 16px}.footer-grid p{color:#a9a6a0;max-width:340px}.footer-grid a,.footer-grid .domain-note{display:block;color:#bdb9b2;margin:8px 0;font-size:14px}.footer-grid a:hover{color:#fff}.domain-note{word-break:break-all}.footer-bottom{display:flex;justify-content:space-between;gap:20px;padding:20px 0;border-top:1px solid #31343b;color:#898780;font-size:12px}
.breadcrumbs{display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding-top:24px;color:var(--muted);font-size:13px}.crumb-sep{opacity:.45}.breadcrumbs a:hover{color:var(--brand)}
.page-hero{display:grid;grid-template-columns:1.05fr .75fr;gap:54px;align-items:center;padding:52px 0 34px}.page-hero__content p{font-size:17px;color:#61636a;max-width:720px;margin:22px 0 0}.page-hero__media{margin:0}.page-hero__media img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:26px}.page-hero--search{grid-template-columns:1fr}
.two-column{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:54px;align-items:start}.content-prose{font-size:16px}.content-prose--wide{max-width:900px}.content-prose h2{font-size:30px;margin:38px 0 14px}.content-prose h2:first-child{margin-top:0}.content-prose p{color:#55585e;margin:0 0 18px}.content-prose a{color:var(--brand);text-decoration:underline;text-underline-offset:3px}.side-panel,.fact-panel{position:sticky;top:110px;background:#fff;border:1px solid #e3dbd2;border-radius:22px;padding:22px}.side-panel h2,.fact-panel h2{font-size:20px;margin-bottom:14px}.side-panel>ul{padding-left:20px;color:var(--muted)}.side-panel>a:not(.button){display:flex;flex-direction:column;gap:2px;padding:12px 0;border-bottom:1px solid var(--line)}.side-panel>a strong{color:var(--ink)}.side-panel>a span{color:var(--muted);font-size:13px}.side-panel .button{margin-top:14px;width:100%}
.comparison-table{border:1px solid var(--line);border-radius:16px;overflow:hidden;margin:22px 0}.comparison-table__row{display:grid;grid-template-columns:.9fr 1.1fr 1fr}.comparison-table__row span{padding:12px 14px;border-top:1px solid var(--line);background:#fff}.comparison-table__row span+span{border-left:1px solid var(--line)}.comparison-table__head span{border-top:0;background:var(--ink);color:#fff;font-weight:750}
.note-box{background:#fff5e8;border-left:4px solid var(--amber);padding:16px 18px;border-radius:10px;margin-top:28px;color:#5a5145}
.access-panel{display:grid;grid-template-columns:.8fr 1.2fr;gap:48px}.domain-card{background:var(--ink);color:#fff;border-radius:26px;padding:34px}.domain-card strong{display:block;font-size:clamp(26px,4vw,44px);word-break:break-word;margin:8px 0 14px}.domain-card p{color:#c8c4bd}.access-notes h2{margin:0 0 16px;font-size:34px;color:var(--ink)}.access-notes p{color:var(--muted)}
.ai-layout{display:grid;grid-template-columns:1fr 330px;gap:50px}.fact-panel dl{margin:0}.fact-panel dl div{padding:14px 0;border-bottom:1px solid var(--line)}.fact-panel dt{font-size:12px;color:var(--muted)}.fact-panel dd{margin:5px 0 0;color:var(--ink)}.fact-panel a{color:var(--brand)}
.editor-note{display:grid;grid-template-columns:210px 1fr;gap:22px;padding:22px 0 34px;border-bottom:1px solid var(--line);margin-bottom:30px}.editor-note strong{font-size:19px}.editor-note p{margin:0;color:var(--muted)}
.topic-groups{display:grid;gap:28px}.topic-group{display:grid;grid-template-columns:320px 1fr;gap:40px;border-top:1px solid var(--line);padding-top:28px}.topic-group__heading{display:grid;grid-template-columns:60px 1fr;gap:16px}.topic-number{font-size:13px;font-weight:900;color:var(--brand)}.topic-group__heading h2{margin:0 0 10px;font-size:28px;color:var(--ink)}.topic-group__heading p{margin:0;color:var(--muted)}.topic-group__items{display:grid;gap:10px}.topic-group__items>a{display:grid;grid-template-columns:120px 220px 1fr;gap:18px;align-items:center;padding:16px;border-radius:14px;background:#fff;border:1px solid #e3dcd3}.topic-group__items>a>span:last-child{color:var(--muted);font-size:13px}.topic-group__items strong{color:var(--ink)}.topic-group__items .eyebrow{margin:0;font-size:10px}
.guide-index{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.guide-index>a{display:grid;grid-template-columns:56px 1fr;gap:18px;background:#fff;border:1px solid #e2dad1;border-radius:18px;padding:20px}.guide-index>a>span{font-size:12px;color:var(--brand);font-weight:900}.guide-index strong{color:var(--ink);font-size:18px}.guide-index p{margin:5px 0 0;color:var(--muted);font-size:14px}
.faq-list{display:grid;gap:12px}.faq-list details{padding:0}.faq-list summary{display:flex;gap:18px;padding:20px 22px;list-style:none}.faq-list summary::-webkit-details-marker{display:none}.faq-list summary span{color:var(--brand);font-size:12px;min-width:28px}.faq-list details>div{padding:0 22px 18px 68px}.faq-followup{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:end}.faq-followup h2{margin:0;color:var(--ink);font-size:34px}.faq-followup p{color:var(--muted)}
.about-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.about-grid article{background:#fff;border:1px solid #e2dad1;border-radius:22px;padding:26px}.about-grid h2{margin:0 0 12px;font-size:25px;color:var(--ink)}.about-grid p{color:var(--muted);margin:0}
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.contact-card{background:#fff;border:1px solid #e1d9d0;border-radius:20px;padding:24px}.contact-card>span{color:var(--brand);font-size:12px;font-weight:900}.contact-card h2{margin:8px 0;font-size:24px;color:var(--ink)}.contact-card p{margin:0;color:var(--muted)}
.safety-list{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.safety-list article{padding:26px;background:#fff;border:1px solid #e1d9d0;border-radius:20px}.safety-list article>span{display:inline-flex;padding:4px 9px;border-radius:999px;background:#f3dfd7;color:var(--brand);font-size:12px;font-weight:800}.safety-list h2{margin:10px 0 8px;font-size:24px}.safety-list p{color:var(--muted)}.safety-list a{color:var(--brand);font-weight:740}
.search-modal[hidden]{display:none!important}.search-modal{position:fixed;inset:0;z-index:100;background:rgba(15,16,19,.36);display:grid;place-items:start center;padding-top:10vh}.search-modal__backdrop{position:absolute;inset:0}.search-modal__dialog{position:relative;z-index:1;width:min(680px,calc(100% - 30px));background:var(--bg);border-radius:24px;padding:28px;box-shadow:0 40px 100px rgba(0,0,0,.25)}.search-modal__dialog h2{margin:0 0 8px;font-size:30px;color:var(--ink)}.search-modal__dialog p{color:var(--muted)}.search-modal__close{position:absolute;right:16px;top:16px;width:36px;height:36px;border:0;border-radius:50%;background:var(--soft);font-size:22px}.search-form{display:flex;gap:10px}.search-form input{min-width:0;flex:1;border:1px solid var(--line);background:#fff;border-radius:999px;padding:12px 16px;outline:none}.search-form input:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(185,71,63,.12)}.search-form button{border:0;background:var(--brand);color:#fff;border-radius:999px;padding:12px 18px;font-weight:760}.search-form--large{display:grid;gap:10px;max-width:780px;margin-bottom:34px}.search-form--large>div{display:flex;gap:10px}.search-form--large label{font-weight:780}
.empty-state{padding:42px;background:#fff;border:1px solid #e2dad1;border-radius:22px}.empty-state h2{margin-top:0;color:var(--ink)}.empty-state p{color:var(--muted)}
.article-page{padding:44px 0 80px}.article-header{max-width:920px;margin:0 auto}.article-header h1{margin:0;color:var(--ink);font-size:clamp(38px,5vw,62px);line-height:1.12;letter-spacing:-.03em}.article-lead{font-size:19px;color:#5d5f65;margin:22px 0 30px}.article-header figure{margin:0}.article-header img{width:100%;aspect-ratio:16/8;object-fit:cover;border-radius:28px}.article-layout{display:grid;grid-template-columns:minmax(0,720px) 300px;gap:60px;justify-content:center;margin-top:46px}.article-body section{margin-bottom:34px}.article-body h2{font-size:29px;margin-bottom:12px}.article-body p{color:#53565d}.article-next{border-top:1px solid var(--line);padding-top:26px}.article-side{position:sticky;top:110px;align-self:start}.article-side h2{font-size:20px;margin-bottom:12px}.article-side>a{display:flex;flex-direction:column;gap:4px;padding:14px 0;border-bottom:1px solid var(--line)}.article-side>a span{font-size:11px;color:var(--brand);font-weight:800}.article-side>a strong{color:var(--ink);font-size:14px}.article-side__box{margin-top:20px;background:var(--soft);padding:18px;border-radius:16px}.article-side__box p{color:var(--muted);font-size:13px}.article-side__box .button{width:100%}
.not-found{padding:100px 0 120px;max-width:820px}.not-found h1{font-size:56px;margin:0;color:var(--ink)}.not-found p{color:var(--muted);font-size:18px}
.back-top{position:fixed;right:22px;bottom:22px;border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:999px;padding:10px 13px;box-shadow:var(--shadow);z-index:40}
@media (max-width:1100px){
  .primary-nav{position:absolute;left:20px;right:20px;top:68px;display:none;flex-direction:column;align-items:stretch;background:var(--bg);border:1px solid var(--line);border-radius:18px;padding:10px;box-shadow:var(--shadow)}
  .primary-nav.is-open{display:flex}.primary-nav a{padding:12px 14px}.menu-toggle{display:inline-flex;margin-left:auto}.header-row>.search-open{display:none}
  .hero{grid-template-columns:1fr .9fr;gap:36px}.article-grid{grid-template-columns:repeat(2,1fr)}.topic-group{grid-template-columns:1fr}.topic-group__items>a{grid-template-columns:110px 200px 1fr}.footer-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:900px){
  .hero,.page-hero,.split-feature,.editorial-row,.editorial-row--reverse,.topic-band,.split-guide,.about-callout,.access-panel,.ai-layout,.two-column,.faq-followup{grid-template-columns:1fr}
  .hero{padding-top:46px}.hero__media{max-width:680px}.topic-band__intro,.side-panel,.fact-panel,.article-side{position:static}.steps{grid-template-columns:repeat(2,1fr)}.feature-grid{grid-template-columns:1fr}.article-grid,.article-grid--wide{grid-template-columns:repeat(2,1fr)}.intro-strip{grid-template-columns:1fr;gap:10px}.topic-group__items>a{grid-template-columns:100px 1fr}.topic-group__items>a>span:last-child{grid-column:2}.article-layout{grid-template-columns:1fr;max-width:760px;margin-inline:auto}.article-side{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.article-side h2{grid-column:1/-1}.article-side>a{background:#fff;border:1px solid var(--line);padding:14px;border-radius:12px}.article-side__box{grid-column:1/-1}.footer-grid{gap:28px}
}
@media (max-width:700px){
  .shell{width:min(100% - 28px,var(--max))}.header-row{min-height:66px;gap:10px}.brand img{width:38px;height:38px}.brand span{font-size:14px}.section{padding-block:48px}.hero__copy h1,.page-hero h1{font-size:38px}.hero__copy>p,.page-hero__content p{font-size:16px}.hero__actions{align-items:stretch}.hero__actions .button{flex:1 1 100%}.section-heading{align-items:flex-start;flex-direction:column;gap:12px}.feature-card{grid-template-columns:104px 1fr}.feature-card img{width:104px;min-height:132px}.article-grid,.article-grid--wide,.faq-grid,.topic-band__list,.guide-index,.about-grid,.contact-grid,.safety-list{grid-template-columns:1fr}.steps{grid-template-columns:1fr}.steps li{min-height:auto}.mini-index a{grid-template-columns:1fr;gap:4px}.comparison-table{overflow-x:auto}.comparison-table__row{min-width:640px}.editor-note{grid-template-columns:1fr}.topic-group__items>a{grid-template-columns:1fr;gap:5px}.topic-group__items>a>span:last-child{grid-column:auto}.article-header img{aspect-ratio:16/10}.article-side{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.footer-bottom{flex-direction:column}.faq-list details>div{padding-left:22px}.search-form--large>div{flex-direction:column}.search-form--large button{width:100%}.not-found h1{font-size:42px}
}
@media (max-width:480px){
  .hero{padding-top:34px}.hero__media::after{display:none}.feature-card{grid-template-columns:1fr}.feature-card img{width:100%;aspect-ratio:16/9;height:auto}.page-hero{gap:26px}.section-heading h2,.intro-strip h2,.editorial-row h2,.topic-band h2,.split-guide h2,.about-callout h2,.content-prose h2{font-size:27px}.article-card__body{padding:18px}.search-modal{padding-top:5vh}.search-modal__dialog{padding:24px 18px}.search-form{flex-direction:column}.search-form button{width:100%}
}