:root{
  --primary:#6F5AE8;--primary-soft:#9A8CF2;--ink:#242433;--text:#30303A;--muted:#70707D;
  --bg:#F8F8FC;--surface:#FFFFFF;--soft:#F0EEFA;--accent:#F29A4A;--line:#E2E0EB;
  --shadow:0 18px 50px rgba(36,36,51,.08);--radius:24px;--small-radius:14px;--container:1180px;
}
*{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","Microsoft YaHei",sans-serif;line-height:1.75;overflow-wrap:break-word}
img{display:block;max-width:100%;height:auto}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}.container{width:min(var(--container),calc(100% - 40px));margin:0 auto}.narrow{width:min(860px,calc(100% - 40px))}.skip-link{position:fixed;left:16px;top:-80px;z-index:9999;background:var(--ink);color:#fff;padding:10px 14px;border-radius:8px}.skip-link:focus{top:16px}.kicker{display:inline-flex;align-items:center;gap:8px;color:var(--primary);font-size:.82rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.kicker::before{content:"";width:20px;height:2px;background:currentColor;border-radius:999px}.section{padding:88px 0}.section-heading{margin-bottom:32px}.section-heading h2{margin:.4rem 0 .6rem;color:var(--ink);font-size:clamp(2rem,4vw,3.35rem);line-height:1.16;letter-spacing:-.035em}.section-heading p{margin:0;color:var(--muted);max-width:720px}.section-heading.split{display:flex;justify-content:space-between;gap:40px;align-items:end}.section-heading.split>p{max-width:460px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 20px;border-radius:999px;font-weight:800;transition:transform .2s ease,box-shadow .2s ease,background .2s ease}.button:hover{transform:translateY(-2px)}.button.primary{background:var(--primary);color:#fff;box-shadow:0 10px 24px rgba(111,90,232,.25)}.button.primary:hover{background:#5e49db}.button.secondary{border:1px solid var(--line);background:#fff;color:var(--ink)}.text-link{display:inline-flex;align-items:center;gap:8px;color:var(--primary);font-weight:700}.text-link::after{content:"→"}.text-link.strong{font-weight:800}.hero-actions{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-top:28px}
.site-header{position:sticky;top:0;z-index:1000;background:rgba(248,248,252,.92);backdrop-filter:blur(14px);border-bottom:1px solid rgba(226,224,235,.88)}.header-row{min-height:76px;display:flex;align-items:center;gap:24px}.brand{display:flex;align-items:center;gap:10px;font-weight:900;color:var(--ink);white-space:nowrap}.brand img{width:42px;height:42px;object-fit:contain}.primary-nav{display:flex;align-items:center;gap:2px;margin-left:auto}.primary-nav a{padding:10px 12px;border-radius:10px;color:var(--muted);font-weight:700;font-size:.94rem}.primary-nav a:hover,.primary-nav a[aria-current="page"]{background:var(--soft);color:var(--ink)}.search-button,.menu-button{border:0;border-radius:999px;background:var(--ink);color:#fff;padding:10px 16px;font-weight:800}.menu-button{display:none}.search-modal[hidden]{display:none!important}.search-modal{position:fixed;inset:0;z-index:3000;display:grid;place-items:start center;padding-top:12vh}.search-backdrop{position:absolute;inset:0;background:rgba(20,20,30,.55);backdrop-filter:blur(6px)}.search-dialog{position:relative;width:min(680px,calc(100% - 32px));background:#fff;border-radius:var(--radius);padding:36px;box-shadow:0 30px 90px rgba(0,0,0,.28)}.search-dialog h2{margin:.5rem 0 1.5rem;color:var(--ink);font-size:2rem;line-height:1.2}.search-close{position:absolute;right:18px;top:16px;width:38px;height:38px;border:0;border-radius:50%;background:var(--soft);font-size:1.5rem}.search-form label{display:block;margin-bottom:8px;font-weight:800;color:var(--ink)}.search-form>div{display:flex;gap:10px}.search-form input{width:100%;min-width:0;border:1px solid var(--line);border-radius:14px;padding:14px 16px;outline:none}.search-form input:focus{border-color:var(--primary);box-shadow:0 0 0 4px rgba(111,90,232,.12)}.search-form button{border:0;border-radius:14px;padding:0 22px;background:var(--primary);color:#fff;font-weight:800}
.home-hero{padding:88px 0 72px;background:radial-gradient(circle at 80% 15%,rgba(154,140,242,.23),transparent 28%),linear-gradient(180deg,#fff,var(--bg))}.hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:64px;align-items:center}.hero-copy h1{margin:.45rem 0 1.1rem;color:var(--ink);font-size:clamp(3.1rem,7vw,6.6rem);line-height:.98;letter-spacing:-.06em}.hero-copy>p{font-size:1.14rem;color:var(--muted);max-width:640px}.hero-notes{display:flex;gap:10px 18px;flex-wrap:wrap;margin:28px 0 0;padding:0;list-style:none;color:var(--muted);font-size:.92rem}.hero-notes li{display:flex;gap:8px;align-items:center}.hero-notes li::before{content:"✓";color:var(--primary);font-weight:900}.hero-media{margin:0;position:relative;padding:18px;border-radius:36px;background:linear-gradient(145deg,var(--soft),#fff);box-shadow:var(--shadow)}.hero-media::after{content:"";position:absolute;right:-24px;bottom:-24px;width:110px;height:110px;border-radius:36px;background:var(--accent);opacity:.16;z-index:-1}.hero-media img{aspect-ratio:1.35/1;object-fit:cover;border-radius:26px}.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.topic-card{background:#fff;border:1px solid var(--line);border-radius:22px;overflow:hidden;box-shadow:0 10px 30px rgba(36,36,51,.04)}.topic-card img{width:100%;aspect-ratio:1.55/1;object-fit:cover}.topic-card>div{padding:24px}.topic-card h3{margin:0 0 10px;color:var(--ink);font-size:1.28rem;line-height:1.3}.topic-card p{color:var(--muted);margin:0 0 18px}.topic-card a{color:var(--primary);font-weight:800}.soft-band{background:var(--soft)}.two-column-feature{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}.two-column-feature.reverse>figure{order:2}.two-column-feature figure{margin:0}.two-column-feature img{width:100%;aspect-ratio:1.35/1;object-fit:cover;border-radius:28px;box-shadow:var(--shadow)}.two-column-feature h2{margin:.5rem 0 1rem;color:var(--ink);font-size:clamp(2rem,4vw,3.3rem);line-height:1.12;letter-spacing:-.04em}.two-column-feature p{color:var(--muted)}.check-list{list-style:none;padding:0;margin:24px 0}.check-list li{padding:10px 0 10px 32px;border-bottom:1px solid rgba(112,112,125,.14);position:relative}.check-list li::before{content:"";position:absolute;left:2px;top:19px;width:12px;height:12px;border-radius:50%;background:var(--primary)}.editorial-grid{display:grid;grid-template-columns:.74fr 1.26fr;gap:70px}.sticky-heading{position:sticky;top:120px;align-self:start}.editorial-list article{display:grid;grid-template-columns:56px 1fr;gap:20px;padding:26px 0;border-top:1px solid var(--line)}.editorial-list article:last-child{border-bottom:1px solid var(--line)}.editorial-list .index{font-weight:900;color:var(--primary-soft)}.editorial-list h3{margin:0 0 7px;color:var(--ink);font-size:1.4rem}.editorial-list p{margin:0;color:var(--muted)}.deep-section{background:var(--ink);color:#fff}.deep-section .kicker{color:#bdb4ff}.guide-band{display:grid;grid-template-columns:.78fr 1.22fr;gap:70px;align-items:start}.guide-band h2{font-size:clamp(2.2rem,4vw,3.5rem);line-height:1.1;margin:.5rem 0 1rem}.guide-band p{color:#c8c8d2}.guide-mini-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.guide-mini-grid a{display:flex;flex-direction:column;gap:8px;padding:22px;border:1px solid rgba(255,255,255,.12);border-radius:18px;background:rgba(255,255,255,.04)}.guide-mini-grid a:hover{background:rgba(255,255,255,.08)}.guide-mini-grid strong{font-size:1.05rem}.guide-mini-grid span{color:#bfbfcc;font-size:.93rem}.faq-preview{background:#fff}.faq-preview-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:22px;overflow:hidden}.faq-preview-grid article{background:#fff;padding:24px}.faq-preview-grid h3{margin:0 0 8px;color:var(--ink);font-size:1.08rem}.faq-preview-grid p{margin:0;color:var(--muted);font-size:.94rem}.about-strip{padding-top:64px}.about-strip-inner{display:grid;grid-template-columns:1fr 1.1fr auto;gap:40px;align-items:center;background:var(--soft);padding:36px;border-radius:26px}.about-strip h2{margin:.4rem 0 0;color:var(--ink);font-size:2rem;line-height:1.2}.about-strip p{margin:0;color:var(--muted)}
.breadcrumbs{padding:22px 0 8px}.breadcrumbs ol{display:flex;gap:8px;flex-wrap:wrap;list-style:none;padding:0;margin:0;color:var(--muted);font-size:.9rem}.breadcrumbs li:not(:last-child)::after{content:"/";margin-left:8px;color:#aaa7b7}.breadcrumbs a:hover{color:var(--primary)}.page-hero{padding:46px 0 70px}.page-hero.compact{padding:52px 0 40px}.page-hero-grid{display:grid;grid-template-columns:1fr .82fr;gap:56px;align-items:center}.page-hero h1{margin:.5rem 0 1rem;color:var(--ink);font-size:clamp(2.65rem,6vw,5.1rem);line-height:1.03;letter-spacing:-.05em}.page-hero p{color:var(--muted);font-size:1.05rem;max-width:700px}.page-hero-media{margin:0;padding:14px;background:#fff;border:1px solid var(--line);border-radius:28px;box-shadow:var(--shadow)}.page-hero-media img{width:100%;aspect-ratio:1.45/1;object-fit:cover;border-radius:20px}.article-section{padding-top:30px}.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:64px;align-items:start}.article-body{font-size:1.05rem}.article-body section{padding:0 0 34px;margin-bottom:34px;border-bottom:1px solid var(--line)}.article-body h2{margin:0 0 12px;color:var(--ink);font-size:1.72rem;line-height:1.25;letter-spacing:-.02em}.article-body p{margin:0;color:#474752}.article-aside{position:sticky;top:118px}.aside-card{padding:22px;background:var(--soft);border-radius:18px}.aside-card strong{display:block;color:var(--ink);font-size:1.08rem}.aside-card p{color:var(--muted);font-size:.92rem}.aside-card a{display:block;padding:10px 0;border-top:1px solid rgba(112,112,125,.16);color:var(--primary);font-weight:700}.related{padding-top:20px}.related-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.related-link{display:flex;flex-direction:column;gap:8px;padding:22px;border:1px solid var(--line);background:#fff;border-radius:18px}.related-link:hover{border-color:var(--primary-soft)}.related-link strong{color:var(--ink)}.related-link span{color:var(--muted);font-size:.92rem}.guide-list{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.guide-item{padding:24px;border:1px solid var(--line);border-radius:18px;background:#fff}.guide-item span{font-weight:900;color:var(--ink);font-size:1.16rem}.guide-item p{margin:6px 0 0;color:var(--muted)}.faq-section{padding-top:34px}.faq-list{display:grid;gap:12px}.faq-item{border:1px solid var(--line);border-radius:16px;background:#fff;padding:0 20px}.faq-item[open]{box-shadow:0 10px 30px rgba(36,36,51,.05)}.faq-item summary{padding:18px 0;font-weight:850;color:var(--ink);cursor:pointer}.faq-answer{padding:0 0 18px;color:var(--muted)}.faq-answer p{margin:0}.inline-search{margin-top:28px}.search-summary{margin-bottom:26px}.search-summary h2{margin:0;color:var(--ink);font-size:2rem}.search-summary p{margin:6px 0 0;color:var(--muted)}.search-results{display:grid;gap:14px}.search-results article{padding:24px;background:#fff;border:1px solid var(--line);border-radius:18px}.search-results h3{margin:.4rem 0 .6rem;font-size:1.35rem}.search-results h3 a{color:var(--ink)}.search-results p{margin:0 0 12px;color:var(--muted)}.empty-state{text-align:center;padding:60px 24px;background:#fff;border:1px solid var(--line);border-radius:24px}.empty-state h2{margin:0 0 10px;color:var(--ink);font-size:2rem}.empty-state p{color:var(--muted)}.empty-state .hero-actions{justify-content:center}.error-page{padding:110px 0 140px;text-align:center}.error-code{display:block;color:var(--primary);font-weight:950;font-size:clamp(6rem,18vw,12rem);line-height:.8;letter-spacing:-.08em;opacity:.24}.error-page h1{font-size:3rem;color:var(--ink);margin:28px 0 12px}.error-page p{color:var(--muted);max-width:650px;margin:0 auto}.error-page .hero-actions{justify-content:center}
.site-footer{margin-top:80px;padding:64px 0 28px;background:var(--ink);color:#fff}.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:46px}.footer-grid strong{display:block;margin-bottom:14px}.footer-grid a{display:block;color:#c6c6d2;padding:5px 0;font-size:.94rem}.footer-grid a:hover{color:#fff}.footer-brand p{max-width:420px;color:#b7b7c4;margin:0}.footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:46px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12);color:#a9a9b8;font-size:.88rem}.back-to-top{position:fixed;right:20px;bottom:20px;width:44px;height:44px;border:0;border-radius:50%;background:var(--primary);color:#fff;box-shadow:0 10px 28px rgba(111,90,232,.3);opacity:0;pointer-events:none;transform:translateY(8px);transition:.2s}.back-to-top.visible{opacity:1;pointer-events:auto;transform:none}
@media(max-width:1024px){.container{width:min(var(--container),calc(100% - 32px))}.primary-nav{position:fixed;left:16px;right:16px;top:84px;display:none;flex-direction:column;align-items:stretch;background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:var(--shadow)}.primary-nav.open{display:flex}.primary-nav a{padding:12px 14px}.menu-button{display:inline-flex;margin-left:auto}.search-button{padding:10px 13px}.hero-grid,.page-hero-grid,.two-column-feature,.editorial-grid,.guide-band{grid-template-columns:1fr;gap:38px}.two-column-feature.reverse>figure{order:0}.hero-media{max-width:780px}.topic-grid{grid-template-columns:repeat(2,1fr)}.sticky-heading,.article-aside{position:static}.article-layout{grid-template-columns:1fr}.footer-grid{grid-template-columns:repeat(2,1fr)}.about-strip-inner{grid-template-columns:1fr 1fr}.about-strip-inner .button{grid-column:1/-1;justify-self:start}}
@media(max-width:768px){.section{padding:68px 0}.home-hero{padding-top:60px}.hero-copy h1{font-size:clamp(3rem,15vw,5rem)}.section-heading.split{display:block}.section-heading.split>p{margin-top:12px}.topic-grid,.faq-preview-grid,.related-grid,.guide-list{grid-template-columns:1fr}.guide-mini-grid{grid-template-columns:1fr}.about-strip-inner{grid-template-columns:1fr}.about-strip-inner .button{grid-column:auto}.footer-grid{grid-template-columns:1fr 1fr}.page-hero{padding-top:30px}.page-hero h1{font-size:clamp(2.6rem,12vw,4.2rem)}.article-body{font-size:1rem}}
@media(max-width:600px){.container,.narrow{width:calc(100% - 24px)}.header-row{min-height:68px;gap:10px}.brand span{font-size:.92rem}.brand img{width:36px;height:36px}.search-button{font-size:0;width:40px;height:40px;padding:0}.search-button::before{content:"⌕";font-size:1.2rem}.menu-button{font-size:.88rem;padding:9px 12px}.home-hero{padding-top:44px}.hero-actions{align-items:stretch}.hero-actions .button{width:100%}.hero-actions .text-link{justify-content:center;width:100%;padding:8px}.hero-notes{display:grid}.section{padding:58px 0}.section-heading h2,.two-column-feature h2{font-size:2rem}.topic-card>div,.faq-preview-grid article{padding:20px}.editorial-list article{grid-template-columns:42px 1fr;gap:12px}.guide-band h2{font-size:2.25rem}.search-dialog{padding:28px 20px}.search-form>div{display:grid}.search-form button{min-height:48px}.footer-grid{grid-template-columns:1fr}.footer-bottom{display:grid}.page-hero-grid{gap:28px}.article-body h2{font-size:1.45rem}.related-link{padding:18px}.error-page h1{font-size:2.2rem}}
@media(max-width:375px){.brand span{max-width:110px;white-space:normal;line-height:1.1}.header-row{gap:7px}.menu-button{padding:8px 10px}.hero-copy h1{font-size:3.2rem}.page-hero h1{font-size:2.7rem}.section-heading h2{font-size:1.85rem}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}