*{box-sizing:border-box}
:root{
  --primary:#6C4FF8;--primary-soft:#9B8AFB;--dark:#1E1B2E;--bg:#F7F6FB;--bg-soft:#EEEAF8;
  --text:#252331;--muted:#716E7E;--accent:#F06A8A;--white:#fff;--line:#DDD8EC;
  --shadow:0 18px 45px rgba(50,41,87,.10);--radius:24px;--radius-sm:16px;
  --shell:min(1180px,calc(100% - 40px));
}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.75}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input,textarea,select{font:inherit}
.skip-link{position:fixed;left:14px;top:12px;z-index:9999;padding:10px 14px;background:var(--dark);color:#fff;border-radius:10px;transform:translateY(-150%);transition:transform .2s ease}
.skip-link:focus{transform:translateY(0)}
.shell{width:var(--shell);margin-inline:auto}
.narrow{max-width:820px}
.narrow-wide{max-width:960px}
.site-header{position:sticky;top:0;z-index:50;background:rgba(247,246,251,.94);backdrop-filter:blur(14px);border-bottom:1px solid rgba(221,216,236,.75)}
.header-inner{min-height:76px;display:flex;align-items:center;gap:28px}
.brand{display:flex;align-items:center;gap:12px;min-width:max-content}
.brand-mark{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(145deg,var(--primary),var(--primary-soft));color:#fff;font-weight:800;box-shadow:0 8px 20px rgba(108,79,248,.22)}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-text strong{font-size:17px}
.brand-text small{font-size:11px;color:var(--muted);margin-top:3px}
.site-nav{margin-left:auto;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.site-nav a{padding:10px 13px;border-radius:12px;color:var(--muted);font-size:14px}
.site-nav a:hover,.site-nav a[aria-current="page"]{background:var(--bg-soft);color:var(--dark)}
.menu-toggle{display:none;margin-left:auto;border:1px solid var(--line);background:#fff;color:var(--dark);border-radius:12px;padding:9px 13px}
.site-main{min-height:70vh}
.hero{padding:76px 0 42px}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(340px,.88fr);gap:54px;align-items:center}
.hero-copy h1,.page-intro h1{font-size:clamp(38px,5.2vw,72px);line-height:1.08;letter-spacing:-.045em;margin:12px 0 22px;color:var(--dark)}
.hero-copy .lead,.page-intro .lead{font-size:18px;max-width:760px;color:#4d495a}
.eyebrow{margin:0 0 8px;color:var(--primary);font-weight:750;font-size:13px;letter-spacing:.08em;text-transform:uppercase}
.button-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.button{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 19px;border-radius:14px;background:var(--primary);color:#fff;font-weight:700;box-shadow:0 10px 26px rgba(108,79,248,.22)}
.button:hover{transform:translateY(-1px)}
.button-ghost{background:transparent;color:var(--dark);border:1px solid var(--line);box-shadow:none}
.button-soft{background:var(--bg-soft);color:var(--primary);box-shadow:none}
.hero-notes{display:flex;flex-wrap:wrap;gap:9px 18px;padding:0;margin:28px 0 0;list-style:none;color:var(--muted);font-size:13px}
.hero-notes li::before{content:"";display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--accent);margin-right:8px;vertical-align:1px}
.hero-media{margin:0;border-radius:32px;overflow:hidden;background:var(--bg-soft);box-shadow:var(--shadow);min-height:360px}
.hero-media img{width:100%;height:100%;min-height:360px;object-fit:cover}
.section{padding:74px 0}
.section-tight{padding-top:34px}
.muted-section{background:var(--bg-soft)}
.section-heading{max-width:760px;margin-bottom:34px}
.section-heading.compact{max-width:620px}
.section-heading h2,.content-panel h2,.reading-main h2,.comparison h2,.callout-section h2{font-size:clamp(29px,4vw,46px);line-height:1.16;letter-spacing:-.035em;margin:7px 0 14px;color:var(--dark)}
.section-heading p:not(.eyebrow){color:var(--muted)}
.link-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.link-grid.two-col{grid-template-columns:repeat(2,minmax(0,1fr))}
.link-card{padding:24px;border:1px solid var(--line);background:rgba(255,255,255,.68);border-radius:var(--radius-sm);min-height:210px;transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}
.link-card:hover{transform:translateY(-3px);border-color:#c6bdf4;box-shadow:0 16px 34px rgba(49,41,82,.08)}
.link-card h3{font-size:20px;line-height:1.32;margin:8px 0 12px}
.link-card h3 a:hover{color:var(--primary)}
.link-card p{margin:0;color:var(--muted);font-size:14px}
.split-grid{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}
.split-grid.reverse .media-panel{order:2}
.media-panel{border-radius:28px;overflow:hidden;background:#ded8f1;box-shadow:var(--shadow)}
.media-panel img{width:100%;aspect-ratio:4/3;object-fit:cover}
.content-panel p{color:var(--muted)}
.text-link{display:inline-block;color:var(--primary);font-weight:750;margin-top:10px}
.text-link::after{content:" →"}
.reading-grid{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(280px,.7fr);gap:50px;align-items:start}
.reading-main p{color:#514d5c}
.reading-aside{background:rgba(255,255,255,.65);padding:26px;border-radius:var(--radius-sm);border:1px solid var(--line)}
.check-list,.fact-list{padding:0;list-style:none;margin:0}
.check-list li,.fact-list li{position:relative;padding-left:24px;margin:10px 0;color:#514d5c}
.check-list li::before,.fact-list li::before{content:"";position:absolute;left:0;top:.72em;width:8px;height:8px;border-radius:50%;background:var(--primary-soft)}
.device-preview-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.device-preview{padding:26px;background:#fff;border-radius:20px;border:1px solid var(--line)}
.device-preview h3{font-size:22px;margin:0 0 10px}
.device-preview p{color:var(--muted)}
.device-preview ul{padding-left:20px;color:#565260}
.section-action{margin-top:26px}
.faq-list{display:grid;gap:12px}
.faq-list details{border:1px solid var(--line);background:#fff;border-radius:16px;padding:0 20px}
.faq-list summary{cursor:pointer;font-weight:700;padding:19px 0;list-style:none}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:"+";float:right;color:var(--primary);font-size:22px}
.faq-list details[open] summary::after{content:"−"}
.faq-list p{margin:0 0 20px;color:var(--muted)}
.page-intro{padding:58px 0 34px;display:grid;grid-template-columns:minmax(0,1.3fr) minmax(280px,.7fr);gap:42px;align-items:center}
.page-intro.page-intro-text{grid-template-columns:1fr}
.page-intro img{width:100%;border-radius:24px;aspect-ratio:4/3;object-fit:cover;box-shadow:var(--shadow)}
.breadcrumb{padding-top:22px}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:8px;list-style:none;padding:0;margin:0;color:var(--muted);font-size:13px}
.breadcrumb li+li::before{content:"/";margin-right:8px;color:#aca6b9}
.breadcrumb a:hover{color:var(--primary)}
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:46px;padding-bottom:80px}
.longform{min-width:0}
.content-section{padding:40px 0;border-top:1px solid var(--line)}
.content-section:first-child{border-top:0}
.content-section h2{font-size:32px;line-height:1.25;margin:7px 0 16px;color:var(--dark)}
.content-section>p:not(.section-number):not(.eyebrow){color:#575362}
.section-number{font-size:12px;font-weight:800;color:var(--accent);letter-spacing:.14em;margin:0}
.prose-block p{font-size:16px}
.callout-section{display:grid;grid-template-columns:1fr auto;gap:30px;align-items:center;padding:30px;border:1px solid #cec6f5;border-radius:20px;background:#fff}
.sticky-toc{position:sticky;top:108px;align-self:start;padding:20px;background:#fff;border:1px solid var(--line);border-radius:16px;display:grid;gap:8px}
.toc-title{font-weight:800;margin:0 0 4px;color:var(--dark)}
.sticky-toc a{font-size:13px;color:var(--muted);padding:7px 8px;border-radius:9px}
.sticky-toc a:hover{background:var(--bg-soft);color:var(--primary)}
.official-flow{display:grid;gap:18px;max-width:980px}
.official-step{display:grid;grid-template-columns:58px 1fr;gap:24px;padding:28px;background:#fff;border-radius:20px;border:1px solid var(--line)}
.step-index{width:48px;height:48px;border-radius:16px;background:var(--dark);color:#fff;display:grid;place-items:center;font-weight:800}
.official-step h2{margin:0 0 10px;font-size:27px}
.official-step>div:last-child>p{color:var(--muted)}
.device-detail-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.device-detail-card{padding:28px;background:#fff;border:1px solid var(--line);border-radius:20px}
.device-detail-card h2{margin-top:0;font-size:25px}
.device-detail-card>p{color:var(--muted)}
.article-stack{display:grid;gap:16px}
.article-stack article{padding:26px 0;border-top:1px solid var(--line)}
.article-stack article:first-child{border-top:0}
.article-stack h3{font-size:24px;margin:0 0 8px}
.article-stack p{margin:0;color:#565260}
.comparison{display:flex;align-items:center;justify-content:space-between;gap:36px;padding-block:10px}
.comparison>div{max-width:760px}
.comparison p{color:var(--muted)}
.film-topic-list{display:grid;gap:12px;max-width:980px}
.film-topic{display:grid;grid-template-columns:64px 1fr;gap:20px;padding:25px;border-bottom:1px solid var(--line)}
.film-number{font-weight:850;color:var(--primary-soft);font-size:20px}
.film-topic h2{font-size:26px;margin:0 0 8px}
.film-topic p{margin:0;color:var(--muted)}
.error-panel{padding:100px 0}
.error-panel h1{font-size:52px;margin:6px 0 14px}
.site-footer{background:var(--dark);color:#e8e4f2;padding:48px 0 18px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.3fr .7fr;gap:40px}
.footer-brand{font-size:23px;font-weight:800;margin:0 0 8px}
.footer-copy{color:#bdb6cf;max-width:620px}
.footer-nav{display:grid;grid-template-columns:1fr 1fr;gap:10px;align-content:start}
.footer-nav a{color:#d8d3e4}
.footer-nav a:hover{color:#fff}
.footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid rgba(255,255,255,.12);margin-top:32px;padding-top:18px;color:#a9a1bb;font-size:13px}
:focus-visible{outline:3px solid rgba(240,106,138,.65);outline-offset:3px;border-radius:8px}

@media (max-width:980px){
  :root{--shell:min(100% - 30px,920px)}
  .hero-grid,.split-grid,.page-intro,.reading-grid{grid-template-columns:1fr}
  .hero-media{min-height:280px}
  .hero-media img{min-height:280px;max-height:520px}
  .link-grid{grid-template-columns:repeat(2,1fr)}
  .device-preview-grid,.device-detail-grid{grid-template-columns:1fr}
  .article-layout{grid-template-columns:1fr}
  .sticky-toc{position:static;grid-template-columns:repeat(3,minmax(0,1fr))}
  .page-intro img{max-height:420px}
}
@media (max-width:760px){
  :root{--shell:calc(100% - 24px)}
  .header-inner{min-height:66px}
  .brand-text small{display:none}
  .menu-toggle{display:block}
  .site-nav{display:none;position:absolute;left:12px;right:12px;top:70px;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);padding:10px}
  .site-nav.is-open{display:grid}
  .site-nav a{padding:12px}
  .hero{padding-top:46px}
  .hero-copy h1,.page-intro h1{font-size:40px}
  .section{padding:54px 0}
  .link-grid,.link-grid.two-col{grid-template-columns:1fr}
  .reading-grid{gap:24px}
  .callout-section{grid-template-columns:1fr}
  .sticky-toc{grid-template-columns:1fr 1fr}
  .official-step{grid-template-columns:1fr}
  .comparison{align-items:flex-start;flex-direction:column}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column}
}
@media (max-width:520px){
  .button-row{flex-direction:column;align-items:stretch}
  .button{width:100%}
  .hero-copy h1,.page-intro h1{font-size:34px}
  .section-heading h2,.content-panel h2,.reading-main h2,.comparison h2,.callout-section h2{font-size:30px}
  .content-section h2{font-size:27px}
  .sticky-toc{grid-template-columns:1fr}
  .film-topic{grid-template-columns:1fr;padding-inline:0}
  .footer-nav{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}
}

.trouble-list{display:grid;gap:14px;margin-top:24px}.trouble-item{padding:22px;border:1px solid var(--line);border-radius:16px;background:#fff}.trouble-item h3{margin:0 0 8px;font-size:19px}.trouble-item p{margin:6px 0;color:var(--muted)}.next-step strong{color:var(--dark)}
.note-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.note-grid article{padding:22px;background:#fff;border:1px solid var(--line);border-radius:16px}.note-grid h3{font-size:18px;margin:0 0 8px}.note-grid p{margin:0;color:var(--muted)}
.term-list{display:grid;gap:0;margin:24px 0 0}.term-list>div{display:grid;grid-template-columns:180px 1fr;gap:22px;padding:18px 0;border-top:1px solid var(--line)}.term-list dt{font-weight:800;color:var(--dark)}.term-list dd{margin:0;color:var(--muted)}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:18px;background:#fff}.device-table{width:100%;border-collapse:collapse;min-width:860px}.device-table th,.device-table td{padding:16px 18px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}.device-table thead th{background:var(--bg-soft);color:var(--dark);font-size:13px}.device-table tbody th{white-space:nowrap}.device-table td{color:var(--muted);font-size:14px}
.security-list{counter-reset:item;list-style:none;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.security-list li{counter-increment:item;padding:20px 20px 20px 56px;position:relative;background:#fff;border:1px solid var(--line);border-radius:16px}.security-list li::before{content:counter(item);position:absolute;left:18px;top:18px;width:26px;height:26px;border-radius:9px;background:var(--dark);color:#fff;display:grid;place-items:center;font-weight:800;font-size:12px}
@media(max-width:760px){.note-grid,.security-list{grid-template-columns:1fr}.term-list>div{grid-template-columns:1fr;gap:6px}}