:root{
  --primary:#6F5AE8;
  --primary-soft:#9A8CF2;
  --dark:#242433;
  --bg:#F8F8FC;
  --soft:#F0EEFA;
  --text:#30303A;
  --muted:#70707D;
  --accent:#F29A4A;
  --white:#FFFFFF;
  --line:#E2E0EC;
  --shadow:0 18px 48px rgba(36,36,51,.09);
  --radius:24px;
  --radius-sm:14px;
  --shell:min(1180px,calc(100% - 40px));
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
button{cursor:pointer}
.shell{width:var(--shell);margin-inline:auto}
main{min-height:65vh}
.site-header{position:sticky;top:0;z-index:50;background:rgba(248,248,252,.94);border-bottom:1px solid rgba(226,224,236,.8);backdrop-filter:blur(18px)}
.header-inner{min-height:78px;display:flex;align-items:center;gap:28px}
.brand{display:flex;align-items:center;gap:12px;min-width:210px}
.brand img{width:44px;height:44px;object-fit:contain}
.brand span{display:flex;flex-direction:column;line-height:1.15}.brand strong{font-size:19px;letter-spacing:.02em}.brand small{margin-top:5px;color:var(--muted);font-size:12px}
.site-nav{margin-left:auto;display:flex;align-items:center;gap:4px}.site-nav a,.nav-search{border:0;background:transparent;padding:10px 12px;border-radius:10px;color:#4b4b58;font-size:15px}.site-nav a:hover,.nav-search:hover,.site-nav a.is-active{background:var(--soft);color:var(--primary)}
.menu-toggle{display:none;margin-left:auto;border:1px solid var(--line);background:var(--white);padding:8px 12px;border-radius:10px;color:var(--dark)}
.search-modal[hidden]{display:none!important;}
.search-modal{position:fixed;inset:0;z-index:90;display:grid;place-items:start center;padding:12vh 20px;background:rgba(20,20,30,.58)}
.search-modal__panel{position:relative;width:min(720px,100%);padding:38px;background:var(--white);border-radius:26px;box-shadow:0 30px 80px rgba(0,0,0,.22)}
.search-modal__panel h2{margin:2px 0 22px;font-size:clamp(24px,4vw,36px);line-height:1.25}.search-close{position:absolute;right:18px;top:14px;width:40px;height:40px;border:0;background:var(--soft);border-radius:50%;font-size:26px;color:var(--dark)}
.search-form label,.inline-search label{display:block;margin-bottom:8px;color:var(--muted);font-size:14px}.search-line{display:flex;gap:10px}.search-line input{min-width:0;flex:1;border:1px solid var(--line);background:var(--bg);border-radius:12px;padding:13px 14px;color:var(--text);outline:none}.search-line input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(111,90,232,.12)}.search-line button{border:0;border-radius:12px;padding:12px 18px;background:var(--primary);color:#fff;font-weight:700}
.eyebrow{margin:0 0 12px;color:var(--primary);font-weight:800;font-size:13px;letter-spacing:.12em;text-transform:uppercase}.section-dark .eyebrow{color:#c9c1ff}
.hero{padding:66px 0 54px;background:radial-gradient(circle at 75% 20%,rgba(154,140,242,.18),transparent 34%),linear-gradient(180deg,#fff,var(--bg))}.hero-grid,.page-hero-grid{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(360px,.92fr);align-items:center;gap:60px}.hero h1,.page-hero h1{margin:0;color:var(--dark);font-size:clamp(42px,5.2vw,70px);line-height:1.08;letter-spacing:-.035em}.page-hero h1{font-size:clamp(38px,4.6vw,60px)}.hero-lead{margin:24px 0 0;color:#51515e;font-size:18px;line-height:1.9}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:11px 18px;border-radius:12px;font-weight:750;line-height:1.3}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:#5e49d9}.btn-accent{background:var(--accent);color:#2d241b}.btn-accent:hover{filter:brightness(.97)}.btn-outline{border:1px solid #cfcbe3;background:transparent;color:var(--dark)}.btn-outline:hover{border-color:var(--primary);color:var(--primary)}.btn-light{background:#fff;color:var(--dark)}.hero-media{margin:0;position:relative}.hero-media:before{content:"";position:absolute;inset:8% -4% -5% 8%;border-radius:32px;background:var(--soft);z-index:0}.hero-media img{position:relative;z-index:1;width:100%;aspect-ratio:1.25/1;object-fit:cover;border-radius:30px;box-shadow:var(--shadow)}.microcopy{margin-top:16px;color:var(--muted);font-size:13px}
.page-hero{padding:56px 0 48px;background:linear-gradient(180deg,#fff 0,var(--bg) 100%)}.page-hero.compact{padding-top:46px}.breadcrumbs{width:var(--shell);margin:18px auto 0;color:var(--muted);font-size:13px}.breadcrumbs ol{display:flex;flex-wrap:wrap;gap:8px;margin:0;padding:0;list-style:none}.breadcrumbs li:not(:last-child):after{content:"/";margin-left:8px;color:#aaa6ba}.breadcrumbs a:hover{color:var(--primary)}
.section{padding:78px 0}.section-soft{background:var(--soft)}.section-dark{background:var(--dark);color:#f5f3ff}.section-heading{max-width:780px;margin-bottom:36px}.section-heading h2,.split-feature h2,.content-columns h2,.faq-preview h2,.about-grid h2,.center-panel h2{margin:0 0 14px;color:var(--dark);font-size:clamp(28px,3.6vw,45px);line-height:1.2;letter-spacing:-.02em}.section-heading p:not(.eyebrow),.split-feature p,.content-columns p,.about-grid p,.center-panel p{color:var(--muted)}.section-dark h2,.section-dark p{color:inherit}.section-dark p{color:#d8d5e5}.text-link{display:inline-flex;margin-top:10px;color:var(--primary);font-weight:750}.text-link:after{content:"→";margin-left:7px;transition:transform .2s}.text-link:hover:after{transform:translateX(3px)}
.route-grid{display:grid;grid-template-columns:1.15fr 1fr 1fr;gap:18px}.route-card{min-height:300px;padding:28px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;box-shadow:0 8px 24px rgba(36,36,51,.04)}.route-card--main{background:var(--dark);color:#fff;border-color:var(--dark)}.route-card>span{display:inline-flex;align-items:center;justify-content:center;width:42px;height:42px;border-radius:50%;background:var(--soft);color:var(--primary);font-weight:850}.route-card--main>span{background:rgba(255,255,255,.12);color:#fff}.route-card h3{margin:34px 0 12px;font-size:24px;line-height:1.35}.route-card p{color:var(--muted);margin:0 0 24px}.route-card--main p{color:#c9c6d6}.route-card a{color:var(--primary);font-weight:750}.route-card--main a{color:#d9d3ff}
.split-feature{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}.split-feature.reverse>div{order:1}.split-feature.reverse>figure{order:2}.split-feature figure,.about-grid figure{margin:0}.split-feature figure img,.about-grid figure img,.flat-media img{width:100%;aspect-ratio:1.28/1;object-fit:cover;border-radius:28px;box-shadow:var(--shadow)}.check-list{list-style:none;margin:24px 0;padding:0}.check-list li{position:relative;padding-left:30px;margin:11px 0}.check-list li:before{content:"✓";position:absolute;left:0;top:0;color:var(--primary);font-weight:900}
.step-list{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:0;padding:0;list-style:none}.step-list li{display:flex;gap:18px;padding:22px;border:1px solid var(--line);border-radius:18px;background:#fff}.step-list li>span{flex:0 0 auto;display:grid;place-items:center;width:46px;height:46px;border-radius:14px;background:var(--soft);color:var(--primary);font-weight:900}.step-list h3{margin:2px 0 6px;font-size:18px}.step-list p{margin:0;color:var(--muted)}.step-list-wide{grid-template-columns:1fr}.step-list-wide li{padding:24px 26px}.center-link{text-align:center;margin-top:30px}
.dark-grid{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:56px}.dark-grid h2{margin:0 0 16px;font-size:clamp(30px,4vw,48px);line-height:1.2}.dark-grid img{width:100%;border-radius:24px;aspect-ratio:1.35/1;object-fit:cover}
.article-list{border-top:1px solid var(--line)}.article-row{display:grid;grid-template-columns:150px 1fr;gap:24px;padding:28px 0;border-bottom:1px solid var(--line)}.article-row__meta{padding-top:5px;color:var(--primary);font-weight:800;font-size:13px}.article-row h3{margin:0 0 8px;font-size:22px;line-height:1.4}.article-row h3 a:hover{color:var(--primary)}.article-row p{margin:0;color:var(--muted)}
.question-band{display:grid;grid-template-columns:.8fr 1.2fr;gap:44px}.question-band h2{margin:0;font-size:clamp(30px,4vw,46px);line-height:1.2}.question-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.question-grid a{display:flex;flex-direction:column;gap:4px;padding:18px;border-radius:16px;background:#fff;border:1px solid var(--line)}.question-grid a:hover{border-color:var(--primary)}.question-grid strong{font-size:16px}.question-grid span{color:var(--muted);font-size:13px}
.faq-preview{display:grid;grid-template-columns:.8fr 1.2fr;gap:54px}.faq-list details{border-bottom:1px solid var(--line);padding:0}.faq-list summary{padding:18px 34px 18px 0;cursor:pointer;font-weight:750;list-style:none;position:relative}.faq-list summary::-webkit-details-marker{display:none}.faq-list summary:after{content:"+";position:absolute;right:4px;top:14px;font-size:24px;color:var(--primary)}.faq-list details[open] summary:after{content:"−"}.faq-list p{margin:0 0 20px;color:var(--muted)}.faq-list-large summary{font-size:18px;padding-block:22px}.faq-list-large p{font-size:16px;line-height:1.9}
.about-band{padding-top:50px}.about-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:56px;align-items:center}
.narrow-content{max-width:860px}.narrow-content h2{font-size:clamp(30px,4vw,44px);line-height:1.25;margin:0 0 20px}.narrow-content p{font-size:17px;color:#565663}.narrow-content a{color:var(--primary);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}.info-callout{margin-top:28px;padding:20px 22px;border-left:4px solid var(--primary);background:#fff;border-radius:0 14px 14px 0;color:#555563}.section-soft .info-callout{background:rgba(255,255,255,.72)}
.four-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.four-grid article{padding:24px 22px;background:#fff;border:1px solid var(--line);border-radius:18px}.four-grid h3{margin:22px 0 10px;font-size:19px}.four-grid p{margin:0;color:var(--muted)}.icon-number{display:inline-grid;place-items:center;min-width:40px;height:40px;padding:0 10px;border-radius:12px;background:var(--soft);color:var(--primary);font-weight:900}
.content-columns{display:grid;grid-template-columns:1fr 1fr;gap:54px;align-items:start}.content-columns h2{margin-top:0}.dark-list{display:grid;gap:10px}.dark-list div{display:grid;grid-template-columns:130px 1fr;gap:14px;padding:16px 18px;border:1px solid rgba(255,255,255,.14);border-radius:14px}.dark-list span{color:#c9c6d6;font-size:14px}.mini-index{display:grid;gap:10px}.mini-index a{display:flex;flex-direction:column;gap:3px;padding:17px 18px;background:#fff;border:1px solid var(--line);border-radius:14px}.mini-index a:hover{border-color:var(--primary)}.mini-index span{color:var(--muted);font-size:13px}
.guide-index{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.guide-index a{display:flex;flex-direction:column;gap:4px;padding:22px;border:1px solid var(--line);border-radius:16px;background:#fff}.guide-index a:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.guide-index strong{font-size:18px}.guide-index span{color:var(--muted);font-size:14px}
.feature-matrix{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.feature-matrix article{padding:28px;border-radius:20px;background:#fff;border:1px solid var(--line)}.feature-matrix article>span{color:var(--primary);font-weight:900}.feature-matrix h2{font-size:22px;margin:26px 0 10px}.feature-matrix p{margin:0;color:var(--muted)}.flat-media{margin:0}
.faq-page-grid{display:grid;grid-template-columns:280px 1fr;gap:46px;align-items:start}.faq-aside{position:sticky;top:100px;display:grid;gap:8px;padding:20px;background:var(--soft);border-radius:16px}.faq-aside h2{font-size:16px;margin:0 0 8px}.faq-aside a{padding:9px 10px;border-radius:9px;color:#555563}.faq-aside a:hover{background:#fff;color:var(--primary)}
.inline-search{max-width:620px}.result-count{margin:26px 0;color:var(--muted)}.search-page{max-width:900px}.search-page h1{font-size:clamp(36px,5vw,54px);line-height:1.15;margin:0 0 28px}.search-results{margin-top:30px;border-top:1px solid var(--line)}.search-results article{padding:24px 0;border-bottom:1px solid var(--line)}.search-results article>span{color:var(--primary);font-size:13px;font-weight:800}.search-results h2{font-size:22px;margin:5px 0 8px}.search-results h2 a:hover{color:var(--primary)}.search-results p{margin:0;color:var(--muted)}.empty-state{margin-top:30px;padding:32px;background:var(--soft);border-radius:18px}.empty-state h2{margin-top:0}
.prose-layout{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:60px;align-items:start}.prose-layout article{max-width:790px}.prose-layout article h2{margin:42px 0 12px;font-size:28px;line-height:1.3}.prose-layout article h2:first-child{margin-top:0}.prose-layout article p{color:#565663;font-size:17px}.prose-aside{position:sticky;top:100px;padding:20px;border:1px solid var(--line);border-radius:16px;background:#fff}.prose-aside h2{font-size:16px;margin:0 0 12px}.prose-aside a{display:block;padding:9px 0;border-bottom:1px solid var(--line);color:#555563}.prose-aside a:last-child{border:0}.prose-aside a:hover{color:var(--primary)}code{padding:2px 6px;border-radius:6px;background:var(--soft);font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:.9em}
.safety-grid,.three-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.safety-grid article,.three-grid article{padding:28px;border:1px solid var(--line);border-radius:20px;background:#fff}.safety-grid h2,.three-grid h2{margin-top:0;font-size:23px}.three-grid p{color:var(--muted)}.plain-steps{padding-left:22px}.plain-steps li{margin:9px 0}.center-panel{max-width:820px;text-align:center}.center-panel .hero-actions{justify-content:center}
.article-header{padding:54px 0 34px;max-width:980px}.article-header h1{max-width:900px;margin:0;color:var(--dark);font-size:clamp(38px,5vw,60px);line-height:1.13;letter-spacing:-.025em}.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}.tag-row span{padding:5px 10px;background:var(--soft);border-radius:999px;color:#5e52a8;font-size:12px;font-weight:700}.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:60px;padding-bottom:84px}.article-body{max-width:790px}.article-intro{font-size:19px;color:#555563;padding:22px 0 26px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.article-body section{padding:22px 0}.article-body h2{font-size:30px;line-height:1.3;margin:18px 0 14px}.article-body p{font-size:17px;color:#50505c}.article-next{margin-top:28px;padding:28px;background:var(--soft);border-radius:20px}.article-next h2{margin-top:0}.article-sidebar{position:sticky;top:102px;align-self:start}.article-sidebar>h2,.sidebar-core h2{font-size:16px;margin:0 0 10px}.article-sidebar>a{display:block;padding:14px 0;border-bottom:1px solid var(--line)}.article-sidebar>a strong{display:block;font-size:15px;line-height:1.45}.article-sidebar>a span{display:block;margin-top:5px;color:var(--muted);font-size:12px;line-height:1.55}.article-sidebar>a:hover strong{color:var(--primary)}.sidebar-core{margin-top:28px;padding:18px;background:var(--soft);border-radius:14px}.sidebar-core a{display:block;padding:7px 0;color:#555563}.sidebar-core a:hover{color:var(--primary)}
.error-panel{max-width:900px;padding:90px 0}.error-panel h1{font-size:clamp(44px,6vw,70px);margin:0 0 12px}.error-panel>p:not(.eyebrow){color:var(--muted);font-size:18px;max-width:680px}.error-panel .question-grid{margin-top:34px}
.site-footer{padding:56px 0 24px;background:#1f1f2c;color:#eceaf5}.footer-grid{display:grid;grid-template-columns:1.25fr 1fr 1fr;gap:50px}.site-footer h2{font-size:16px;margin:0 0 14px}.site-footer p{color:#b9b6c8;max-width:450px}.site-footer ul{list-style:none;margin:0;padding:0}.site-footer li{margin:8px 0}.site-footer a{color:#c9c6d6}.site-footer a:hover{color:#fff}.footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:42px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12);color:#9f9caf;font-size:13px}.back-top{position:fixed;right:24px;bottom:24px;z-index:40;width:44px;height:44px;border:0;border-radius:50%;background:var(--primary);color:#fff;box-shadow:var(--shadow);font-weight:900}
@media (max-width:1024px){
  :root{--shell:min(94%,940px)}
  .menu-toggle{display:block}.site-nav{position:absolute;top:70px;left:3%;right:3%;display:none;flex-direction:column;align-items:stretch;padding:12px;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow)}.site-nav.is-open{display:flex}.site-nav a,.nav-search{text-align:left}
  .hero-grid,.page-hero-grid{grid-template-columns:1fr;gap:40px}.hero-media{max-width:720px}.hero{padding-top:52px}
  .route-grid{grid-template-columns:1fr 1fr}.route-card--main{grid-column:1/-1}.four-grid{grid-template-columns:1fr 1fr}.guide-index,.feature-matrix{grid-template-columns:1fr 1fr}.faq-page-grid{grid-template-columns:220px 1fr}.article-layout{grid-template-columns:minmax(0,1fr) 260px;gap:38px}.safety-grid,.three-grid{grid-template-columns:1fr 1fr}.three-grid article:last-child{grid-column:1/-1}
}
@media (max-width:768px){
  :root{--shell:min(92%,680px)}
  body{font-size:15px}.header-inner{min-height:70px}.brand{min-width:auto}.brand small{display:none}
  .hero,.page-hero{padding:42px 0}.hero h1,.page-hero h1{font-size:clamp(36px,11vw,52px)}.hero-lead{font-size:16px}.section{padding:58px 0}
  .route-grid,.split-feature,.dark-grid,.question-band,.faq-preview,.about-grid,.content-columns,.prose-layout,.article-layout{grid-template-columns:1fr}.split-feature.reverse>div,.split-feature.reverse>figure{order:unset}.step-list{grid-template-columns:1fr}.article-row{grid-template-columns:1fr;gap:5px}.four-grid,.guide-index,.feature-matrix,.safety-grid,.three-grid{grid-template-columns:1fr 1fr}.faq-page-grid{grid-template-columns:1fr}.faq-aside,.prose-aside,.article-sidebar{position:static}.article-sidebar{border-top:1px solid var(--line);padding-top:30px}.footer-grid{grid-template-columns:1fr 1fr}.footer-grid section:first-child{grid-column:1/-1}.question-grid{grid-template-columns:1fr 1fr}.search-modal{padding-top:8vh}.search-modal__panel{padding:30px 22px}
}
@media (max-width:600px){
  :root{--shell:calc(100% - 30px)}
  .hero-actions{flex-direction:column;align-items:stretch}.btn{width:100%}.route-grid,.four-grid,.guide-index,.feature-matrix,.safety-grid,.three-grid,.question-grid,.footer-grid{grid-template-columns:1fr}.route-card--main,.footer-grid section:first-child,.three-grid article:last-child{grid-column:auto}.route-card{min-height:auto}.step-list li{padding:18px}.dark-list div{grid-template-columns:1fr;gap:4px}.search-line{flex-direction:column}.search-line button{min-height:46px}.article-header{padding-top:42px}.article-body h2{font-size:25px}.footer-bottom{flex-direction:column}.hero-media:before{display:none}.hero-media img,.split-feature figure img,.about-grid figure img{border-radius:20px}
}
@media (max-width:375px){
  :root{--shell:calc(100% - 24px)}
  .brand strong{font-size:17px}.brand img{width:38px;height:38px}.menu-toggle{padding:7px 10px}.hero h1,.page-hero h1{font-size:35px}.section-heading h2,.split-feature h2,.content-columns h2,.faq-preview h2,.about-grid h2,.center-panel h2{font-size:29px}.route-card,.feature-matrix article,.safety-grid article,.three-grid article{padding:21px}.article-row h3{font-size:20px}.question-grid a{padding:16px}
}