*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#080A0D;color:#C7CDD5;font:16px/1.8 Arial,'PingFang SC','Microsoft YaHei',sans-serif}body.drawer-open{overflow:hidden}a{color:#9bb8ff;text-decoration:none}a:hover{color:#d0e4ff}a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid #8ED8FF;outline-offset:3px}img{display:block;max-width:100%;height:auto;object-fit:contain;object-position:center center}h1,h2,h3,p{margin-top:0}h1,h2,h3{color:#F5F7FA;line-height:1.38}h1{font-size:34px;letter-spacing:.01em}h2{font-size:26px}h3{font-size:19px}p{margin-bottom:17px}.wrap{max-width:1200px;margin-inline:auto;padding-inline:24px;min-width:0}.site-head{background:rgba(8,10,13,.96);border-bottom:1px solid rgba(255,255,255,.09)}.head-inner{height:76px;display:flex;align-items:center;gap:24px}.brand{display:flex;align-items:center;gap:8px;min-width:210px;max-width:245px;color:#f5f7fa}.brand-logo{max-height:36px;width:auto;max-width:130px}.brand-en{font-size:9px;letter-spacing:.04em;line-height:1.3;color:#9098A3}.desktop-nav{display:flex;align-items:center;justify-content:center;gap:clamp(12px,1.35vw,24px);flex:1;white-space:nowrap}.desktop-nav a{font-size:14px;color:#C7CDD5;position:relative;padding:26px 0}.desktop-nav a.active,.desktop-nav a:hover{color:#6EA8FF}.desktop-nav a.active:after{content:'';position:absolute;bottom:15px;height:2px;background:#6EA8FF;left:0;right:0}.enter-btn{display:inline-flex;justify-content:center;align-items:center;height:42px;padding:0 21px;border-radius:999px;background:#5C7CFA;color:white;white-space:nowrap;font-size:14px;font-weight:bold}.enter-btn:hover{background:#7390ff;color:white}.menu-toggle{display:none}.quick-bar{background:#10141A;border-bottom:1px solid rgba(255,255,255,.09)}.quick-inner{min-height:44px;display:flex;gap:32px;align-items:center}.quick-inner a{font-size:14px;color:#b9c2cd}.quick-inner a.active{color:#6EA8FF}.quick-mobile{display:none}.breadcrumbs{font-size:13px;color:#9098a3;margin:25px 0 20px;display:flex;gap:10px;flex-wrap:wrap}.breadcrumbs span[aria-current]{color:#c7cdd5}main{padding-bottom:76px}.page-intro{padding:18px 0 25px;border-bottom:1px solid rgba(255,255,255,.11);margin-bottom:30px}.page-intro .eyebrow,.eyebrow{font-size:12px;letter-spacing:.15em;color:#8ED8FF;text-transform:uppercase;font-weight:bold}.page-intro .lede{max-width:790px;font-size:17px;color:#abb6c5}.article-layout{display:grid;grid-template-columns:minmax(0,820px) minmax(205px,1fr);align-items:start;gap:42px}.article-body{min-width:0}.article-body section{margin:0 0 37px}.article-body h2{border-left:3px solid #5C7CFA;padding-left:14px}.article-body p{line-height:1.84}.article-aside{border:1px solid rgba(255,255,255,.09);border-radius:14px;background:#12161C;padding:20px;position:sticky;top:24px}.article-aside h2{font-size:18px}.article-aside a{display:block;border-top:1px solid rgba(255,255,255,.07);padding:10px 0;font-size:14px}.article-aside p{font-size:13px;color:#9098a3}.related{border-top:1px solid rgba(255,255,255,.14);margin-top:38px;padding-top:25px}.related h2{font-size:22px}.related-links{display:flex;flex-wrap:wrap;gap:10px}.related-links a,.topic-link{border:1px solid rgba(255,255,255,.12);padding:9px 16px;border-radius:9px;color:#cddaff}.related-links a:hover{background:#1b2129}.feature-img{background:#0D1015;border:1px solid rgba(255,255,255,.09);border-radius:14px;padding:14px;margin:18px 0 30px;max-width:100%;min-width:0}.feature-img img{max-height:245px;width:100%;height:auto}.feature-img figcaption,.tile figcaption{font-size:13px;color:#9098A3;margin-top:10px;line-height:1.6}.img-placeholder{height:150px;border:1px solid rgba(255,255,255,.09);background:linear-gradient(145deg,#12161C,#0D1015);border-radius:12px;max-width:100%;min-width:0}.feature-img .img-placeholder{height:205px}.site-footer{background:#050608;border-top:1px solid rgba(255,255,255,.08);padding:50px 0 18px}.foot-grid{display:grid;grid-template-columns:1.4fr 1.4fr 1fr;gap:45px}.foot-grid h2{font-size:18px}.foot-brand p{max-width:350px;font-size:14px;color:#9098A3;margin-top:15px}.footer-logo{max-height:34px;max-width:150px}.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:5px 15px}.footer-links a{color:#a8b4c5;font-size:13px}.foot-bottom{border-top:1px solid rgba(255,255,255,.08);margin-top:42px;padding-top:18px;display:flex;justify-content:space-between;gap:20px;font-size:12px;color:#9098A3}.back-top{position:fixed;right:22px;bottom:24px;width:43px;height:43px;border:1px solid rgba(255,255,255,.17);background:#171C23;color:#fff;border-radius:50%;font-size:24px;cursor:pointer;opacity:0;pointer-events:none;transition:opacity .2s}.back-top.shown{opacity:1;pointer-events:auto}.drawer-shade{position:fixed;inset:0;background:rgba(0,0,0,.7);z-index:40;visibility:hidden;pointer-events:none}.drawer-shade:not([hidden]){visibility:visible;pointer-events:auto}.site-drawer{position:fixed;left:0;top:0;bottom:0;width:min(390px,86vw);max-width:100%;background:#0D1015;z-index:41;transform:translateX(-105%);visibility:hidden;pointer-events:none;overflow-y:auto;padding:18px 23px 30px;transition:transform .22s,visibility .22s}.drawer-open .site-drawer{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-top{display:flex;justify-content:space-between;align-items:center;padding-bottom:12px;border-bottom:1px solid #2b313b}.drawer-logo{max-height:32px;width:auto}.menu-close{border:0;background:transparent;color:white;font-size:31px;cursor:pointer}.drawer-group{padding:12px 0}.drawer-group h2{font-size:13px;color:#9098A3;letter-spacing:.08em;margin:8px 0}.drawer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:5px 8px}.drawer-links a{font-size:14px;padding:5px 0;color:#d2d8df}.hero{display:grid;grid-template-columns:minmax(0,52fr) minmax(0,48fr);align-items:center;gap:35px;padding:47px 0 40px}.hero h1{font-size:40px}.hero p{font-size:17px}.hero-visual{margin:0;min-width:0;background:#0D1015;border:1px solid rgba(255,255,255,.09);border-radius:14px;padding:12px;height:285px;display:flex;justify-content:center;align-items:center}.hero-visual img{max-height:100%;max-width:100%;width:auto;height:auto}.hero-visual .img-placeholder{width:100%;height:100%}.hero-actions{display:flex;flex-wrap:wrap;gap:24px;margin-top:22px}.section-block{margin:38px 0 54px;min-width:0}.section-heading{display:flex;align-items:baseline;gap:18px;border-bottom:1px solid rgba(255,255,255,.10);padding-bottom:13px;margin-bottom:22px}.section-heading small{color:#8ED8FF;letter-spacing:.08em}.section-heading h2{margin:0}.topic-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.topic-card{background:#12161C;border:1px solid rgba(255,255,255,.09);border-radius:14px;padding:23px;min-width:0}.topic-card h3{margin-bottom:8px}.topic-card p{font-size:15px}.split{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,.7fr);gap:40px;align-items:start}.split.reverse{grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr)}.side-notes{border-left:1px solid rgba(255,255,255,.15);padding-left:24px}.side-notes p{font-size:14px}.side-notes strong{color:#8ED8FF}.visual-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.visual-grid.four{grid-template-columns:repeat(4,minmax(0,1fr))}.tile{margin:0;padding:12px;border-radius:13px;background:#12161C;border:1px solid rgba(255,255,255,.09);min-width:0}.tile img{width:100%;max-height:175px;height:auto}.tile .img-placeholder{height:155px}.tile h3{margin:12px 0 6px}.tile p{font-size:14px}.split-photo{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:38px;align-items:center}.split-photo figure{margin:0}.split-photo .feature-img img{max-height:240px}.mobile-photo{grid-template-columns:minmax(0,1fr) 270px}.mobile-photo .feature-img img{max-height:340px}.numbered-index{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.index-item{display:grid;grid-template-columns:40px 1fr;border-top:1px solid rgba(255,255,255,.13);padding-top:15px}.index-item .num{color:#6EA8FF;font-size:17px}.index-item p{font-size:14px}.info-strip{background:#12161C;border-left:3px solid #7775FF;padding:23px 26px;border-radius:0 12px 12px 0}.entry-line{border-bottom:1px solid rgba(255,255,255,.10);padding:16px 0}.entry-line p{max-width:850px}.entry-line h2{font-size:21px;margin:0 0 8px}.steps{counter-reset:step}.steps section h2:before{counter-increment:step;content:counter(step,decimal-leading-zero) '  ';color:#8ED8FF}.comparison{border-collapse:collapse;width:100%;margin:22px 0 35px;font-size:14px}.comparison td,.comparison th{border-bottom:1px solid rgba(255,255,255,.13);text-align:left;padding:13px 10px;vertical-align:top}.comparison th{color:#f5f7fa;background:#171C23}.faq-item{border-bottom:1px solid rgba(255,255,255,.13);padding:12px 0}.faq-item summary{cursor:pointer;color:#f5f7fa;font-size:17px;font-weight:bold}.faq-item p{padding:11px 8px 0;max-width:850px}.index-columns{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.index-columns section{padding:20px;background:#12161C;border-radius:12px}.index-columns h2{font-size:21px}.index-columns a{display:inline-block;margin:4px 14px 4px 0}.index-columns p{font-size:14px}.minor-note{font-size:13px;color:#9098A3}.photo-wall{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.photo-wall .tile img{max-height:245px}.photo-wall .tile:first-child{grid-column:span 2}.photo-wall .tile:first-child img{max-height:235px}
@media(max-width:1100px){.desktop-nav{gap:11px}.brand{min-width:175px}.brand-en{display:none}}
@media(max-width:979px){.wrap{padding-inline:20px}.site-head .head-inner{height:64px;position:relative;justify-content:space-between}.desktop-nav,.quick-inner{display:none}.menu-toggle{display:flex;width:40px;height:40px;flex-direction:column;align-items:center;justify-content:center;gap:5px;background:transparent;border:1px solid rgba(255,255,255,.15);border-radius:10px;cursor:pointer;padding:0}.menu-toggle span{width:18px;height:2px;background:#fff}.brand{position:absolute;left:50%;transform:translateX(-50%);min-width:0;max-width:120px;justify-content:center}.brand-logo{max-height:28px;max-width:110px}.enter-btn{height:39px;padding:0 15px;font-size:13px}.quick-mobile{display:flex;align-items:center;gap:24px;white-space:nowrap;overflow-x:auto;scrollbar-width:none;padding:0 20px;height:44px}.quick-mobile::-webkit-scrollbar{display:none}.quick-mobile a{color:#c7cdd5;font-size:14px}.article-layout{grid-template-columns:1fr}.article-aside{position:static}.visual-grid.four{grid-template-columns:repeat(2,minmax(0,1fr))}.foot-grid{gap:20px}.hero{gap:24px}.hero h1{font-size:34px}}
@media(max-width:767px){.wrap{padding-inline:16px}body{font-size:15px;line-height:1.78}h1{font-size:26px}h2{font-size:21px}h3{font-size:18px}.page-intro .lede{font-size:15px}.hero{display:flex;flex-direction:column-reverse;align-items:stretch;padding:25px 0}.hero h1{font-size:29px}.hero-visual{height:210px}.hero p{font-size:15px}.hero-actions{gap:14px}.section-block{margin:30px 0 36px}.section-heading{gap:10px}.split,.split.reverse,.split-photo,.mobile-photo,.topic-grid,.numbered-index,.index-columns{grid-template-columns:1fr}.visual-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.visual-grid.four{grid-template-columns:repeat(2,minmax(0,1fr))}.tile{padding:10px}.tile img{max-height:155px}.feature-img img{max-height:185px}.mobile-photo .feature-img{max-width:220px;margin-inline:auto}.mobile-photo .feature-img img{max-height:340px}.side-notes{border-left:0;border-top:1px solid rgba(255,255,255,.12);padding:15px 0 0}.foot-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:26px}.foot-brand{grid-column:span 2}.foot-bottom{display:block}.section-heading h2{font-size:21px}.photo-wall{gap:10px}.photo-wall .tile img{max-height:185px}.site-footer{padding-top:32px}}
@media(max-width:374px){.brand-logo{max-width:94px}.enter-btn{padding-inline:11px;font-size:12px}.head-inner{gap:8px}.quick-mobile{gap:20px}.visual-grid,.visual-grid.four{grid-template-columns:1fr}.photo-wall{grid-template-columns:1fr}.photo-wall .tile:first-child{grid-column:auto}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.site-drawer,.back-top{transition:none}}
/* Keep header geometry stable before the administrator uploads the optional logo. */
.brand .img-placeholder{width:116px;height:32px;flex:0 0 116px;border-radius:6px}.drawer-top .img-placeholder{width:125px;height:30px;border-radius:6px}.foot-brand>.img-placeholder{width:140px;height:34px;border-radius:6px}
@media(max-width:979px){.brand .img-placeholder{width:100px;height:26px;flex-basis:100px}}
@media(max-width:374px){.brand .img-placeholder{width:90px;flex-basis:90px}}