*{box-sizing:border-box}html{scroll-behavior:smooth;overflow-x:hidden}body{margin:0;background:#F4F8FD;color:#243447;font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.8;overflow-x:hidden}img{max-width:100%}a{color:#1C63E8}button,input,select,textarea{font:inherit}.site-header{position:sticky;top:0;z-index:9999;width:100%;background:rgba(247,251,255,.96);box-shadow:0 8px 24px rgba(16,48,84,.08);backdrop-filter:blur(14px)}.header-inner{max-width:1220px;min-height:72px;margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;gap:16px;position:relative}.site-logo{display:inline-flex;align-items:center;justify-content:center;flex:0 0 auto;text-decoration:none}.site-logo img{display:block;height:40px;width:auto;max-width:168px;object-fit:contain}.logo-placeholder{height:40px;min-width:132px;padding:0 16px;display:inline-flex;align-items:center;justify-content:center;border-radius:12px;background:#EAF3FF;color:#143250;font-weight:800;letter-spacing:.06em}.nav-core{display:flex;align-items:center;gap:6px;white-space:nowrap;flex-wrap:nowrap}.nav-core a{color:#143250;padding:8px 12px;border-radius:999px;font-weight:700;text-decoration:none}.nav-core a.is-current,.nav-core a:hover{background:#E4F0FF;color:#1C63E8}.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}.login-btn{height:42px;min-width:88px;padding:0 18px;display:inline-flex;align-items:center;justify-content:center;background:#1C63E8;color:#FFF;border-radius:999px;text-decoration:none;font-weight:700;white-space:nowrap}.register-btn{height:42px;min-width:88px;padding:0 18px;display:inline-flex;align-items:center;justify-content:center;background:#FFF;color:#143250;border:1px solid #C3D6F0;border-radius:999px;text-decoration:none;font-weight:700;white-space:nowrap}.mobile-menu-btn{display:none;width:42px;height:42px;border:1px solid #C3D6F0;background:#FFF;border-radius:12px;padding:9px;align-items:center;justify-content:center;flex-direction:column;gap:4px}.mobile-menu-btn span{width:20px;height:2px;background:#143250;border-radius:4px}.channel-strip{background:#FFF;border-top:1px solid #EDF3FA;border-bottom:1px solid #E5EEF8}.channel-inner{max-width:1220px;margin:0 auto;padding:0 20px;display:flex;align-items:center;gap:4px;overflow-x:auto;white-space:nowrap;scrollbar-width:thin}.channel-inner a{display:inline-flex;align-items:center;min-height:44px;padding:0 11px;color:#5B6B7C;text-decoration:none;font-size:14px}.channel-inner a:hover{color:#1C63E8}.site-main{min-height:60vh;overflow:hidden}.page-shell{width:min(1220px,calc(100% - 40px));margin:0 auto}.reading{max-width:860px;margin:0 auto}.hero{padding:76px 0 70px}.hero-grid,.split{display:grid;grid-template-columns:minmax(0,1.18fr) minmax(320px,.82fr);gap:42px;align-items:center}.hero-copy h1,.page-hero h1{margin:0 0 20px;color:#143250;font-size:clamp(40px,4.6vw,52px);line-height:1.14;letter-spacing:-.02em}.hero-copy p,.page-hero p{font-size:18px;color:#5B6B7C;margin:0 0 22px}.eyebrow{display:inline-flex;align-items:center;gap:8px;margin-bottom:14px;color:#1C63E8;font-size:14px;font-weight:800;letter-spacing:.08em}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}.primary-btn,.outline-btn{height:46px;padding:0 22px;display:inline-flex;align-items:center;justify-content:center;border-radius:999px;text-decoration:none;font-weight:800}.primary-btn{background:#1C63E8;color:#FFF}.primary-btn:hover{background:#154FC0}.outline-btn{background:#FFF;border:1px solid #C3D6F0;color:#143250}.section{padding:72px 0}.section-tight{padding:48px 0}.section-alt{background:#EAF3FF}.section-title{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:28px}.section-title h2{margin:0;color:#143250;font-size:clamp(28px,3.1vw,38px);line-height:1.2}.section-title p{margin:0;max-width:600px;color:#6A7887}.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.info-card,.topic-card,.plain-card,.quote-card,.qa-item,.step-item,.index-panel,.note-panel{background:#FFF;border:1px solid #DCEAFB;border-radius:18px;box-shadow:0 14px 34px rgba(16,48,84,.06)}.info-card,.plain-card,.quote-card,.qa-item,.step-item,.index-panel,.note-panel{padding:24px}.info-card h3,.plain-card h3,.topic-card h3,.step-item h3,.index-panel h3,.note-panel h3{margin:0 0 10px;color:#143250;font-size:20px}.info-card p,.plain-card p,.topic-card p,.quote-card p,.step-item p,.index-panel p,.note-panel p{margin:0;color:#5B6B7C}.text-link{display:inline-flex;margin-top:14px;font-weight:800;text-decoration:none}.text-link:hover{text-decoration:underline}.topic-card{overflow:hidden}.topic-card .topic-body{padding:19px 20px 21px}.topic-card .topic-body p{font-size:15px;line-height:1.65}.media{position:relative;width:100%;max-width:100%;overflow:hidden;border-radius:18px;background:#EAF3FF;aspect-ratio:16/9}.media>img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;object-position:center center;display:block}.media-placeholder{position:absolute;inset:0;display:block;background:linear-gradient(135deg,#EAF3FF,#F8FBFF)}.media-hero{height:286px}.media-feature{height:244px}.media-card{height:176px;border-radius:0}.quick-scroll{display:flex;gap:12px;overflow-x:auto;padding:4px 0 12px;scrollbar-width:thin}.quick-scroll a{flex:0 0 auto;padding:11px 15px;background:#FFF;border:1px solid #DCEAFB;border-radius:999px;color:#143250;text-decoration:none;font-weight:700}.quick-scroll a:hover{border-color:#8FB6F4;color:#1C63E8}.dual-feature{display:grid;grid-template-columns:1fr 1fr;gap:24px}.feature-panel{padding:30px;background:#FFF;border:1px solid #DCEAFB;border-radius:18px;box-shadow:0 14px 34px rgba(16,48,84,.06)}.feature-panel h2{margin:0 0 12px;color:#143250;font-size:28px}.feature-panel p{margin:0 0 14px;color:#5B6B7C}.page-hero{padding:62px 0 42px}.page-hero.compact{padding-bottom:22px}.breadcrumb{display:flex;gap:8px;flex-wrap:wrap;color:#7A8896;font-size:14px;margin-bottom:16px}.breadcrumb a{color:#5B6B7C;text-decoration:none}.article{font-size:17px;line-height:1.88}.article h2{margin:42px 0 14px;color:#143250;font-size:30px;line-height:1.25}.article h3{margin:28px 0 10px;color:#143250;font-size:21px}.article p{margin:0 0 20px}.article ul,.article ol{padding-left:1.25em;margin:0 0 24px}.article li{margin:8px 0}.article .lead{font-size:19px;color:#43566A}.article-links{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0}.article-links a{padding:8px 12px;border-radius:999px;background:#EAF3FF;color:#154FC0;text-decoration:none;font-weight:700}.steps{display:grid;gap:16px;counter-reset:step}.step-item{position:relative;padding-left:74px}.step-item:before{counter-increment:step;content:counter(step);position:absolute;left:22px;top:22px;width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:#1C63E8;color:#FFF;font-weight:800}.comparison{display:grid;grid-template-columns:1fr 1fr;gap:22px}.comparison>div{padding:26px;background:#FFF;border:1px solid #DCEAFB;border-radius:18px}.comparison h2,.comparison h3{margin-top:0;color:#143250}.qa-list{display:grid;gap:14px}.qa-item h3{font-size:18px}.qa-item p{margin:8px 0 0}.quote-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.quote-card{min-height:150px}.quote-card strong{display:block;margin-top:12px;color:#143250}.notice{padding:22px 24px;border-left:4px solid #1C63E8;background:#FFF;border-radius:0 18px 18px 0;box-shadow:0 14px 34px rgba(16,48,84,.05)}.notice p{margin:0}.tag-list{display:flex;gap:9px;flex-wrap:wrap}.tag-list span,.tag-list a{display:inline-flex;padding:7px 11px;border-radius:999px;background:#EAF3FF;color:#154FC0;text-decoration:none;font-size:14px;font-weight:700}.footer-grid{max-width:1220px;margin:0 auto;padding:58px 20px 38px;display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:38px}.site-footer{background:#0E2338;color:#D5E6F6}.footer-grid h2{margin:0 0 14px;color:#FFF;font-size:16px}.footer-grid a{display:block;margin:8px 0;color:#D5E6F6;text-decoration:none}.footer-grid a:hover{color:#FFF}.footer-brand p{max-width:320px;color:#B8CEE0}.footer-logo{display:inline-flex;margin-bottom:14px}.footer-logo img{display:block;height:42px;width:auto;max-width:176px;object-fit:contain;filter:brightness(0) invert(1)}.footer-logo-placeholder{display:inline-flex;padding:6px 12px;border:1px solid rgba(255,255,255,.24);border-radius:10px;color:#FFF;font-weight:800}.footer-bottom{border-top:1px solid rgba(213,230,246,.16);max-width:1220px;margin:0 auto;padding:22px 20px 32px;display:flex;justify-content:space-between;gap:28px;align-items:flex-start}.footer-bottom p{margin:0;color:#AFC7DA;font-size:14px;max-width:860px}.float-tools{position:fixed;right:18px;top:42%;z-index:7000;display:flex;flex-direction:column;gap:8px;width:92px}.float-tools a,.float-tools button{min-height:42px;padding:7px 8px;border:1px solid #DCEAFB;border-radius:12px;background:#FFF;color:#1C63E8;text-align:center;text-decoration:none;font-size:13px;font-weight:800;box-shadow:0 10px 28px rgba(16,48,84,.09);cursor:pointer}.float-tools .float-primary{background:#1C63E8;color:#FFF;border-color:#1C63E8}.mobile-bottom{display:none}.mobile-drawer,.drawer-overlay{display:none}.mini-list{display:grid;gap:12px}.mini-list a{display:flex;justify-content:space-between;gap:12px;padding:14px 16px;border-radius:14px;background:#FFF;border:1px solid #DCEAFB;text-decoration:none;color:#143250;font-weight:700}.mini-list a:after{content:'→';color:#1C63E8}.rule-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.rule-item{padding:22px;border-radius:18px;background:#FFF;border:1px solid #DCEAFB}.rule-item strong{display:block;color:#143250;margin-bottom:7px}.table-like{display:grid;gap:10px}.table-row{display:grid;grid-template-columns:180px 1fr;gap:18px;padding:15px 18px;border-radius:14px;background:#FFF;border:1px solid #DCEAFB}.table-row strong{color:#143250}.spacer-top{margin-top:28px}.muted{color:#7A8896}.center{text-align:center}
@media (min-width:1181px){.site-main{padding-right:70px}.site-header{padding-right:70px}}
@media (max-width:1099px){.channel-strip{display:none}.grid-4{grid-template-columns:repeat(3,minmax(0,1fr))}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:900px){body{padding-bottom:68px}.header-inner{min-height:64px;padding:0 14px}.mobile-menu-btn{display:inline-flex;flex:0 0 42px}.site-logo{position:absolute;left:50%;transform:translateX(-50%)}.site-logo img{height:34px;max-width:132px}.site-logo .logo-placeholder{height:34px;min-width:118px;font-size:14px}.nav-core{display:none}.header-actions .register-btn{display:none}.header-actions{margin-left:auto}.login-btn{height:40px;min-width:72px;padding:0 15px}.float-tools{display:none}.mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:8000;height:62px;background:#FFF;border-top:1px solid #DCEAFB;display:grid;grid-template-columns:repeat(4,1fr);box-shadow:0 -8px 24px rgba(16,48,84,.08)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;color:#143250;text-decoration:none;font-size:14px;font-weight:800}.mobile-drawer{display:block;position:fixed;left:0;top:0;bottom:0;z-index:12000;width:min(86vw,328px);background:#FFF;transform:translateX(-102%);transition:transform .24s ease;box-shadow:18px 0 48px rgba(16,48,84,.18)}.drawer-overlay{display:block;position:fixed;inset:0;z-index:11000;background:rgba(14,35,56,.42);opacity:0;visibility:hidden;transition:.24s ease}.drawer-open{overflow:hidden}.drawer-open .mobile-drawer{transform:translateX(0)}.drawer-open .drawer-overlay{opacity:1;visibility:visible}.drawer-head{height:70px;padding:0 16px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #E8F0F8}.drawer-logo img{display:block;height:34px;width:auto;max-width:148px;object-fit:contain}.drawer-close{width:40px;height:40px;border:0;background:#EAF3FF;border-radius:12px;color:#143250;font-size:28px;line-height:1}.drawer-scroll{height:calc(100% - 70px);overflow-y:auto;padding:14px 16px 28px}.drawer-scroll section{margin-bottom:18px}.drawer-scroll h2{margin:0 0 8px;color:#7A8896;font-size:12px;letter-spacing:.08em}.drawer-scroll a{display:block;padding:10px 8px;border-radius:10px;color:#143250;text-decoration:none;font-weight:700}.drawer-scroll a:hover{background:#EAF3FF;color:#1C63E8}.hero{padding:54px 0}.hero-grid,.split{grid-template-columns:1fr;gap:28px}.hero-copy h1,.page-hero h1{font-size:clamp(30px,8.4vw,38px)}.hero-copy p,.page-hero p{font-size:17px}.section{padding:54px 0}.section-tight{padding:38px 0}.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}.quote-grid,.rule-grid{grid-template-columns:1fr 1fr}.media-hero{height:210px}.media-feature{height:228px}.dual-feature,.comparison{grid-template-columns:1fr}.page-hero{padding:44px 0 28px}.article h2{font-size:26px}.footer-bottom{display:block}.footer-bottom p+p{margin-top:8px}.table-row{grid-template-columns:140px 1fr}}
@media (max-width:620px){.page-shell{width:min(100% - 28px,1220px)}.grid-4,.grid-3,.grid-2,.quote-grid,.rule-grid,.footer-grid{grid-template-columns:1fr}.hero{padding:44px 0}.section{padding:46px 0}.section-title{display:block}.section-title p{margin-top:10px}.media-hero{height:198px}.media-feature{height:210px}.media-card{height:170px}.feature-panel{padding:24px}.article{font-size:16px}.article .lead{font-size:17px}.article h2{margin-top:34px;font-size:24px}.table-row{grid-template-columns:1fr;gap:5px}.footer-grid{padding-top:44px;gap:24px}.footer-bottom{padding-bottom:26px}}