:root{color-scheme:dark;--bg:#000;--deep:#050505;--panel:#0b0b0b;--panel2:#121212;--hover:#1a1a1a;--title:#f7f7f7;--body:#ddd;--muted:#a5a5a5;--silver:#c7c7c7;--line:rgba(255,255,255,.12);--focus:rgba(255,255,255,.40)}*{box-sizing:border-box}html{scroll-behavior:auto}body{margin:0;background:var(--bg);color:var(--body);font:16px/1.75 system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;overflow-wrap:anywhere}body.modal-open{overflow:hidden}a{color:inherit;text-decoration:none}a:hover{color:#fff}button,input{font:inherit}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible{outline:2px solid #fff;outline-offset:3px}img{display:block;max-width:100%;width:100%;height:auto;object-fit:contain;object-position:center}figure{margin:0}h1,h2,h3,p{margin-top:0}h1,h2,h3{color:var(--title);font-weight:650;line-height:1.35;letter-spacing:.01em}h1{font-size:clamp(28px,3vw,34px)}h2{font-size:clamp(22px,2.2vw,27px)}h3{font-size:19px}p{margin-bottom:1.05em;max-width:78ch}.wrap{width:min(1240px,calc(100% - 48px));margin-inline:auto}.site-header{position:sticky;top:0;z-index:30;background:#050505;border-bottom:1px solid var(--line)}.head-main{min-height:72px;display:flex;align-items:center;gap:28px}.brand{display:flex;align-items:center;gap:9px;min-width:0;white-space:nowrap}.brand-logo{height:32px;width:auto;max-width:104px;object-fit:contain}.brand-name,.brand-fallback{font-size:23px;font-weight:700;color:white}.brand:has(.brand-logo) .brand-name{font-size:18px}.masthead{flex:1;min-width:0;display:flex;flex-direction:column;align-items:center;line-height:1.35;letter-spacing:.10em;font-size:11px;color:var(--muted)}.masthead strong{font-size:13px;color:var(--silver)}.head-actions{display:flex;align-items:center;gap:8px}.head-button,.close-panel{border:1px solid var(--line);background:transparent;color:var(--title);min-height:44px;min-width:44px;padding:7px 16px;border-radius:4px;display:inline-flex;align-items:center;justify-content:center;white-space:nowrap}.head-button:hover,.close-panel:hover{background:var(--hover);border-color:var(--focus)}.desktop-nav{border-top:1px solid var(--line)}.nav-inner{height:48px;display:flex;align-items:stretch;gap:clamp(12px,2.4vw,34px)}.nav-link{display:inline-flex;align-items:center;border-bottom:2px solid transparent;white-space:nowrap;font-size:14px;color:var(--silver)}.nav-link:hover,.nav-link[aria-current=page]{border-color:var(--title);color:var(--title)}.main-content{padding-block:30px 74px;min-height:55vh}.eyebrow{font-size:11px!important;letter-spacing:.15em;text-transform:uppercase;color:var(--muted)!important}.section{padding:38px 0;border-bottom:1px solid var(--line)}.section>h2{margin-bottom:20px}.section p{line-height:1.8}.page-intro{padding:24px 0 33px;border-bottom:1px solid var(--line)}.page-intro h1{max-width:850px;margin:0 0 14px}.lead{font-size:17px;color:var(--silver);max-width:850px}.intro-actions,.action-row{display:flex;gap:12px 18px;flex-wrap:wrap;align-items:center}.text-link{display:inline-flex;align-items:center;min-height:44px;color:var(--title);border-bottom:1px solid var(--focus);font-size:14px;padding:8px 1px}.text-link:hover{background:var(--hover)}.btn{min-height:44px;display:inline-flex;align-items:center;justify-content:center;padding:8px 19px;background:#fff;color:#000;border:1px solid #fff;border-radius:4px;font-size:14px;font-weight:650}.btn:hover{background:#ddd;color:#000}.btn-secondary{background:transparent;color:#fff;border-color:var(--focus)}.btn-secondary:hover{background:#1a1a1a;color:#fff}.hero{border-bottom:1px solid var(--line);padding-bottom:36px}.hero-image{display:flex;justify-content:center;max-height:300px;margin-bottom:28px}.hero-image img{width:auto;max-width:100%;max-height:300px}.hero-content{display:grid;grid-template-columns:.95fr 1.05fr;gap:48px;align-items:start}.hero-content p{max-width:590px}.hero-content h1{margin-top:8px}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.cards.four{grid-template-columns:repeat(4,minmax(0,1fr))}.card{padding:22px;background:var(--panel);border:1px solid var(--line);border-radius:7px;min-width:0}.card p{color:var(--silver);font-size:15px}.card .text-link{margin-top:4px}.vertical-list{display:grid;grid-template-columns:1fr;gap:0}.vertical-list .card{border-radius:0;display:grid;grid-template-columns:210px minmax(0,1fr) auto;gap:24px;align-items:start}.vertical-list .card h3{margin-top:8px}.vertical-list .card p{max-width:780px}.news-section{display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,5vw,65px)}.news-items article{border-bottom:1px solid var(--line);padding:16px 0}.news-items article p{font-size:14px;color:var(--silver)}.news-image{max-height:260px;display:flex;justify-content:center}.news-image img{max-height:260px;width:auto}.feature-strip{display:grid;grid-template-columns:minmax(0,.65fr) minmax(0,1fr);align-items:center;gap:34px;padding:25px 0;border-top:1px solid var(--line)}.feature-strip.text-only{grid-template-columns:1fr;max-width:930px;padding-left:10%}.feature-image{display:flex;justify-content:center;max-height:240px}.feature-image img{width:auto;max-height:240px}.wide-image{display:flex;justify-content:center;max-height:var(--image-limit);margin:22px auto 28px}.wide-image img{width:auto;max-height:var(--image-limit)}.portrait-image{display:flex;justify-content:center;max-height:var(--image-limit);margin:18px auto}.portrait-image img{width:auto;max-height:var(--image-limit)}.inline-image{display:flex;justify-content:flex-start;max-height:var(--image-limit);margin-bottom:20px}.inline-image img{width:auto;max-height:var(--image-limit)}.split-pair{display:grid;grid-template-columns:1fr 1fr;gap:20px}.split-pair article{padding:25px;background:var(--panel);border:1px solid var(--line)}.note-field{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(240px,.8fr);gap:40px}.note-field aside{background:var(--panel);padding:24px;border:1px solid var(--line)}.note-field aside article{border-top:1px solid var(--line);padding-top:12px}.note-field aside article p{font-size:14px}.app-feature{display:grid;grid-template-columns:minmax(0,.65fr) minmax(0,1.35fr);gap:45px;align-items:center}.app-art{display:flex;flex-direction:column;align-items:center}.app-art .portrait-image{max-width:340px}.app-icon{margin-top:10px}.app-icon img{width:auto;max-height:72px;max-width:72px}.strip-list{padding-top:20px}.strip{padding:30px 0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:minmax(175px,.6fr) minmax(0,1.4fr);gap:42px}.strip h2{margin:0}.strip-copy p{max-width:820px}.article-section p{max-width:850px}.article-section{max-width:1000px}.related{padding:24px 0;display:flex;flex-wrap:wrap;gap:12px 24px;align-items:center}.related strong{color:var(--silver)}.related a{padding:7px 0;border-bottom:1px solid var(--focus)}.faq-list{max-width:980px}.faq-item{padding:25px 0;border-bottom:1px solid var(--line)}.faq-item h2{font-size:20px}.faq-item p{max-width:880px}.site-footer{border-top:1px solid var(--line);background:var(--deep);padding:40px 0 30px}.footer-top{display:grid;grid-template-columns:220px minmax(0,1fr);gap:45px}.footer-brand-line{display:flex;align-items:center;gap:9px;flex-wrap:wrap;color:white}.footer-brand-line .brand-logo{height:32px}.footer-brand-line span{font-size:11px;letter-spacing:.09em;color:var(--silver)}.footer-brand p,.legal,.copyright-text{font-size:13px;color:var(--muted)}.footer-links{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:16px}.footer-group{display:flex;flex-direction:column;align-items:flex-start;gap:8px}.footer-group h3{font-size:14px}.footer-group a{font-size:13px;color:var(--silver);min-height:28px}.legal{padding-top:30px;margin-top:28px;border-top:1px solid var(--line)}.copyright-text{margin-bottom:0}.shade{position:fixed;inset:0;background:rgba(0,0,0,.75);z-index:39}.shade[hidden]{display:none}.overlay-panel{position:fixed;top:120px;left:0;right:0;z-index:40;background:var(--panel2);border-bottom:1px solid var(--focus);box-shadow:0 14px 30px #000;visibility:hidden;pointer-events:none;opacity:0;transition:opacity .12s ease;max-height:min(70dvh,800px);overflow-y:auto;overscroll-behavior:contain}.overlay-panel.is-open{visibility:visible;pointer-events:auto;opacity:1}.panel-inner{padding:23px 0 27px}.panel-top{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:20px}.panel-top h2{margin:0}.menu-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}.menu-group h3{font-size:16px;border-bottom:1px solid var(--line);padding-bottom:10px}.menu-group a{display:flex;flex-direction:column;padding:8px 10px;min-height:54px;border-radius:4px}.menu-group a:hover,.menu-group a:focus-visible{background:var(--hover)}.menu-group a strong{font-size:14px}.menu-group a span{font-size:12px;color:var(--muted)}.search-panel .panel-inner{max-width:580px;width:min(580px,calc(100% - 48px))}.search-panel label{display:block;color:var(--silver);font-size:14px;margin-bottom:9px}.search-panel input{display:block;width:100%;background:#000;border:1px solid var(--focus);color:white;border-radius:4px;padding:10px 14px;min-height:44px}.small-note{font-size:12px;color:var(--muted);margin-top:8px}.quick-links,.search-matches{display:flex;flex-wrap:wrap;gap:8px}.quick-links a,.search-matches a{padding:7px 12px;background:var(--hover);border:1px solid var(--line);border-radius:4px;min-height:44px}.bottom-nav{display:none}
@media(max-width:1050px){.nav-inner{gap:16px}.nav-link{font-size:13px}.nav-link:nth-child(n+7){display:none}.footer-top{grid-template-columns:1fr}.footer-links{grid-template-columns:repeat(3,minmax(0,1fr))}.cards.four{grid-template-columns:repeat(2,minmax(0,1fr))}.menu-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:760px){.wrap{width:calc(100% - 32px)}.head-main{min-height:60px;gap:8px}.brand-logo{height:28px;max-width:72px}.brand-name,.brand-fallback{font-size:19px}.brand:has(.brand-logo) .brand-name{font-size:0}.masthead,.desktop-nav,.wide-label{display:none}.head-actions{margin-left:auto;gap:4px}.head-button{padding:6px 9px;font-size:13px}.main-content{padding-top:16px;padding-bottom:92px}.bottom-nav{display:grid;position:fixed;bottom:0;left:0;right:0;z-index:29;grid-template-columns:repeat(5,minmax(0,1fr));background:#0b0b0b;border-top:1px solid var(--focus);height:calc(56px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom)}.bottom-link{display:flex;align-items:center;justify-content:center;background:transparent;color:#ddd;border:0;font-size:12px;min-width:0;min-height:44px;padding:0 2px}.bottom-link[aria-current=page]{background:#1a1a1a;color:white;border-top:2px solid white}.bottom-link:hover{background:#1a1a1a}.site-footer{padding-bottom:calc(40px + 56px + env(safe-area-inset-bottom))}.overlay-panel{top:60px;max-height:70dvh}.menu-grid{grid-template-columns:1fr;gap:4px}.menu-group h3{margin:8px 0}.menu-group a{min-height:48px}.hero-content,.news-section,.feature-strip,.split-pair,.note-field,.app-feature,.strip{grid-template-columns:1fr;gap:16px}.hero-content{gap:8px}.section{padding:27px 0}.vertical-list .card{grid-template-columns:1fr;gap:0}.vertical-list .card h3{margin:0 0 8px}.feature-strip.text-only{padding-left:0}.footer-links{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-top{gap:20px}.app-feature .portrait-image img{max-height:360px}.app-feature .portrait-image{max-height:360px}.wide-image{max-height:var(--image-limit)}.strip{padding:24px 0}.menu-group a span{font-size:12px}}
@media(max-width:390px){.head-button{padding:6px 7px;font-size:12px}.head-actions{gap:2px}.brand{gap:4px}.brand:has(.brand-logo) .brand-name{display:none}.brand-logo{max-width:58px}.cards.four,.cards{grid-template-columns:1fr}.footer-links{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.footer-group a{font-size:12px}}
@media(prefers-reduced-motion:reduce){.overlay-panel{transition:none}}