 :root{--sky:#48BAF1;--sky-soft:#BFEAFF;--sky-pale:#E9F8FF;--navy:#14344F;--navy-deep:#102B42;--action-blue:#116A9B;--action-hover:#0D5278;--paper:#FAFCFE;--paper-white:#FFFFFF;--fog:#F2F7FA;--border:#DBEAF2;--title:#173754;--body:#354A59;--muted:#416A80;--coral:#F08B82;--mint:#7BC7B4;--lavender:#AD9CDE;--apricot:#E2B36A}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",Arial,sans-serif;color:var(--body);background:var(--paper);line-height:1.78;font-size:16px}a{color:var(--action-blue);text-decoration:none}a:hover{text-decoration:underline;color:var(--action-hover)}button,input,textarea,select{font:inherit}button{cursor:pointer}img{max-width:100%;height:auto;display:block}h1,h2,h3,h4{line-height:1.33;color:var(--title);margin:0 0 15px}h1{font-size:36px}h2{font-size:25px}h3{font-size:19px}p{margin:0 0 15px}.skip{position:absolute;left:-9999px}.skip:focus{left:10px;top:10px;z-index:99;background:white;padding:10px}.site-header{background:white;border-bottom:1px solid var(--border);position:relative;z-index:5}.header-inner{max-width:1260px;min-height:68px;padding:0 30px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{display:flex;align-items:center;gap:10px;color:var(--navy);white-space:nowrap}.brand:hover{text-decoration:none}.brand-mark{background:var(--sky);color:var(--navy-deep);border-radius:12px;font-weight:900;font-size:24px;padding:2px 10px}.brand-image{max-height:45px;max-width:120px;object-fit:contain}.brand-copy{display:flex;flex-direction:column;line-height:1.2}.brand-copy strong{font-size:21px}.brand-copy small{font-size:9px;letter-spacing:1.4px;margin-top:5px}.desktop-nav{display:flex;align-items:center;gap:20px}.desktop-nav a{font-size:14px;color:var(--navy);font-weight:650}.desktop-nav a[aria-current=page]{color:var(--action-blue)}.header-tools{display:flex;gap:8px}.icon-btn,.menu-trigger,.drawer-head button{background:var(--sky-pale);color:var(--navy);border:1px solid var(--border);border-radius:10px;min-height:44px;padding:0 12px}.icon-btn{font-size:26px}.channel-rail{background:var(--sky-pale);border-top:1px solid var(--border)}.rail-inner{max-width:1260px;margin:auto;display:flex;justify-content:space-between;gap:28px;padding:8px 30px;overflow-x:auto;white-space:nowrap;scrollbar-width:thin}.rail-inner a{color:var(--navy);font-size:14px;font-weight:600}.search-pop{max-width:1260px;margin:auto;padding:10px 30px}.search-pop form{display:flex;align-items:center;gap:12px}.search-pop input{flex:1;min-width:0}.search-pop[hidden],.drawer-mask[hidden]{display:none}.drawer{position:fixed;z-index:25;right:0;top:0;height:100dvh;width:min(420px,88vw);background:white;box-shadow:-12px 0 50px #102b4230;transform:translateX(105%);transition:transform .2s;overflow:auto;padding:22px}.drawer.open{transform:translateX(0)}.drawer-mask{position:fixed;inset:0;z-index:24;background:#102b4288}.drawer-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}.drawer-links{display:grid;grid-template-columns:1fr 1fr;gap:8px}.drawer-links a{background:var(--sky-pale);border-radius:8px;padding:8px 10px;font-size:14px}.site-main{max-width:1260px;margin:auto;padding:32px 30px 74px;min-height:60vh}.hero{background:linear-gradient(125deg,#dcf4ff 0%,#a4dff9 70%,#86cce9 100%);border:1px solid #a4ddf4;border-radius:18px;display:grid;grid-template-columns:44% 56%;overflow:hidden;min-height:340px}.hero-copy{padding:38px;align-self:center}.hero h1{font-size:38px}.hero p{font-size:17px}.hero-media{min-height:290px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#b7e8fa,#71c9f1)}.hero-media img{width:100%;height:100%;object-fit:contain}.hero-graphic{font-size:clamp(48px,8vw,108px);font-weight:900;letter-spacing:-5px;color:#176a93;opacity:.23}.eyebrow{display:inline-block;font-size:13px;font-weight:750;letter-spacing:.5px;color:#14668d;margin-bottom:10px}.btn{display:inline-flex;align-items:center;justify-content:center;background:var(--action-blue);color:white!important;border:0;border-radius:10px;min-height:44px;padding:9px 18px;font-weight:700}.btn:hover{background:var(--action-hover);text-decoration:none}.btn.secondary{background:white;color:var(--navy)!important;border:1px solid #8abed8}.button-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:20px}.quick-links{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:10px}.quick-links a{padding:12px 8px;text-align:center;border:1px solid var(--border);background:white;border-radius:12px;font-weight:700;font-size:14px}.home-section{margin-top:52px}.section-head{display:flex;align-items:end;justify-content:space-between;gap:12px;margin-bottom:19px}.section-head h2{margin-bottom:2px}.section-head p{font-size:14px;color:var(--muted);margin:0}.article-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.card{border:1px solid var(--border);border-radius:14px;padding:22px;background:white}.item{display:flex;flex-direction:column;min-height:190px}.item p{flex:1;font-size:15px}.item h3{font-size:19px}.item h3 a{color:var(--title)}.plain-link{font-size:14px;font-weight:700}.feature-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:17px}.feature-tile{display:grid;grid-template-columns:36% 1fr;overflow:hidden;padding:0}.feature-visual{min-height:170px;background:linear-gradient(135deg,#e6f7ff,#c1e9fa);display:flex;align-items:center;justify-content:center}.feature-visual img{width:100%;height:100%;object-fit:contain}.feature-symbol{font-size:40px;opacity:.6}.feature-body{padding:20px}.feature-body h3{font-size:18px}.feature-body p{font-size:14px}.accent-mint .feature-visual{background:#d8f3e9}.accent-purple .feature-visual{background:#eee8fb}.accent-peach .feature-visual{background:#fff0e5}.thread-list{display:grid;gap:12px}.thread-card{padding:18px 22px;background:white;border:1px solid var(--border);border-radius:12px}.thread-card h3{margin-bottom:6px}.thread-card p{font-size:14px;margin:0}.page-heading{padding:28px 0 30px}.page-heading p{max-width:750px;color:var(--muted)}.article-body{max-width:780px;margin:0 auto}.article-body h1{font-size:34px}.article-body .lead{font-size:19px;color:var(--navy)}.article-body p{line-height:1.85;margin:20px 0}.article-body .metadata{border-bottom:1px solid var(--border);padding-bottom:15px;color:var(--muted);font-size:14px}.breadcrumbs{font-size:13px;margin-bottom:18px}.topic-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.notice{background:var(--sky-pale);padding:12px 16px;border-radius:10px;border-left:3px solid var(--sky);font-size:14px}.form-field{display:grid;gap:5px;margin-bottom:15px}.form-field input,.form-field textarea,.form-field select,input[type=search]{width:100%;padding:9px 12px;min-height:44px;border:1px solid #92b4c5;background:white;border-radius:8px;color:var(--navy)}.form-field textarea{min-height:140px}.form-box{max-width:720px}.pagination{display:flex;gap:8px;margin:24px 0}.pagination a{padding:6px 14px;border:1px solid var(--border);border-radius:8px}.pagination [aria-current=page]{background:var(--sky-pale);font-weight:800}.footer{background:var(--navy-deep);color:#edf8ff}.footer-inner{max-width:1260px;margin:auto;padding:48px 30px;display:grid;grid-template-columns:2fr repeat(5,1fr);gap:24px}.footer-title{font-size:18px}.footer p{font-size:14px;margin-top:14px;color:#d8eafa}.footer h3{color:#d7f2ff;font-size:15px}.footer a{display:block;color:#d9ecfa;font-size:13px;margin:4px 0}.footer-bottom{padding:14px 30px;border-top:1px solid #315873;text-align:center;font-size:13px}.mobile-bottom{display:none}.side-layout{display:grid;grid-template-columns:170px minmax(0,1fr) 260px;gap:20px}.side-layout>aside{padding-top:4px}.side-layout>aside a{display:block;padding:7px 0;border-bottom:1px solid var(--border);font-size:14px}.center-stack .article-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.search-results{margin-top:22px}.simple-list{padding-left:20px}.simple-list li{margin-bottom:10px}.post-article{max-width:800px}.post-article p{white-space:pre-wrap}.rule-label{font-weight:700}.site-main a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid #e89f4a;outline-offset:2px}@media(max-width:1199px){.side-layout{grid-template-columns:minmax(0,1fr)}.side-layout>aside{display:none}.desktop-nav{gap:10px}.desktop-nav a{font-size:12px}}@media(max-width:850px){.desktop-nav{display:none}.article-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-inner{grid-template-columns:repeat(3,1fr)}.footer-inner>div:first-child{grid-column:span 3}.hero h1{font-size:32px}.quick-links{grid-template-columns:repeat(3,1fr)}}@media(max-width:600px){body{font-size:16px}.header-inner{padding:0 16px}.site-main{padding:20px 17px 94px}.brand-copy strong{font-size:18px}.brand-copy small{font-size:8px}.brand-image{max-width:68px}.menu-trigger{font-size:12px;padding:0 8px}.rail-inner{padding:8px 16px;gap:22px}.hero{grid-template-columns:1fr}.hero-copy{padding:28px 20px}.hero h1{font-size:29px}.hero-media{min-height:170px;max-height:260px}.hero-graphic{font-size:65px}.home-section{margin-top:32px}.section-head h2{font-size:22px}.article-grid,.feature-grid,.topic-grid{grid-template-columns:1fr}.feature-tile{grid-template-columns:34% 1fr}.feature-body{padding:13px}.feature-body h3{font-size:16px}.feature-body p{font-size:13px}.quick-links{grid-template-columns:repeat(3,1fr)}.article-body h1,h1{font-size:28px}.card{padding:18px}.footer-inner{grid-template-columns:repeat(2,1fr);gap:20px;padding:30px 18px}.footer-inner>div:first-child{grid-column:span 2}.mobile-bottom{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:10;background:white;border-top:1px solid var(--border);justify-content:space-around;padding:6px 0 max(6px,env(safe-area-inset-bottom))}.mobile-bottom a{display:flex;flex-direction:column;align-items:center;color:var(--navy);font-size:22px;line-height:1.1;min-width:44px}.mobile-bottom small{font-size:11px;margin-top:5px}.search-pop{padding:12px 16px}.search-pop form{flex-wrap:wrap}.search-pop label{width:100%}}@media(max-width:340px){.brand-copy small{display:none}.quick-links{grid-template-columns:repeat(2,1fr)}.menu-trigger{font-size:11px}}