:root{--bg:#F6F4FC;--deep:#E8F2FA;--card:#fff;--ink:#2A2D4A;--text:#3A3E58;--muted:#6A6E88;--soft:#8A8EAA;--purple:#7B6BB5;--blue:#6BA3D6;--lilac:#C9B8E8;--mist:#B8D4F0;--peach:#E8B4B8;--line:rgba(42,45,74,.12);--shadow:0 14px 34px rgba(42,45,74,.09);--max:1140px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.75 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;overflow-x:hidden}body.locked{overflow:hidden}a{color:inherit;text-decoration:none}button{font:inherit}.wrap{width:min(var(--max),calc(100% - 32px));margin:auto}.top-fixed{position:fixed;inset:0 0 auto;z-index:50;box-shadow:0 4px 18px rgba(42,45,74,.05)}.nation-line{height:7px;background:linear-gradient(90deg,var(--purple),var(--blue));color:#fff;overflow:visible}.line-inner{position:relative;height:7px;font-size:11px;display:flex;align-items:center;justify-content:space-between}.line-inner>span{position:relative;top:11px;color:var(--ink);font-weight:700}.text-btn{position:relative;top:11px;border:0;background:transparent;color:var(--ink);cursor:pointer;min-width:44px;min-height:44px}.nation-stage{height:48px;background:#fff;border-bottom:1px solid rgba(201,184,232,.7)}.stage-inner{height:48px;display:flex;align-items:center;justify-content:space-between}.brand-link{display:flex;align-items:center;min-height:44px}.brand-logo{height:24px;max-width:150px;object-fit:contain}.brand-fallback{font-weight:900;color:var(--ink);font-size:20px}.stage-actions{display:flex;gap:8px;align-items:center}.menu-btn,.app-btn,.btn-primary,.btn-secondary{min-height:44px;padding:0 16px;border-radius:12px;display:inline-flex;align-items:center;justify-content:center;font-weight:750;cursor:pointer}.menu-btn{border:1px solid var(--blue);background:#fff;color:var(--ink)}.app-btn,.btn-primary{border:1px solid var(--purple);background:var(--purple);color:#fff}.btn-secondary{border:1px solid var(--blue);background:#fff;color:var(--ink)}.nation-nav{height:44px;background:#fff;border-bottom:1px solid var(--line)}.nav-inner{height:44px;display:flex;align-items:center;justify-content:center;gap:16px}.nav-inner a{height:44px;display:flex;align-items:center;padding:0 4px;color:var(--text);position:relative}.nav-inner a.active{color:var(--purple);font-weight:800}.nav-inner a.active:after{content:"";position:absolute;left:4px;right:4px;bottom:0;height:2px;background:var(--blue)}.nav-inner i{width:1px;height:15px;background:var(--mist)}.site-main{padding-top:112px}.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.hero,.page-hero{padding:34px 0 18px}.hero-center{text-align:center}.media-slot{background:linear-gradient(135deg,#EFEAFB,#E8F2FA);border:1px solid var(--line);border-radius:16px;display:flex;align-items:center;justify-content:center;overflow:hidden;min-height:120px}.media-slot img{width:100%;height:100%;object-fit:contain;object-position:center}.cover-slot{height:210px;max-width:900px;margin:0 auto 22px}.cover-slot 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.media-slot{height:170px;margin-bottom:16px}.four-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.four-grid .media-slot{height:155px;margin-bottom:14px}.stack-feature{display:grid;grid-template-columns:1.05fr .95fr;gap:20px;align-items:center}.stack-feature.reverse{grid-template-columns:.95fr 1.05fr}.stack-feature .media-slot{height:180px}.app-layout{display:grid;grid-template-columns:320px 1fr;gap:24px;align-items:center}.app-layout .media-slot{height:420px}.small-mark{width:72px;height:72px;border-radius:16px;background:#fff;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;margin-bottom:14px}.small-mark img{width:100%;height:100%;object-fit:contain}.prose{max-width:920px;margin:auto}.prose .content-card{margin-bottom:18px}.notice{border-left:4px solid var(--blue);background:#fff;padding:14px 16px;border-radius:0 12px 12px 0;color:var(--muted)}.faq-list{display:grid;gap:14px}.faq-item{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px}.faq-item h2{font-size:18px}.site-footer{background:var(--ink);color:#E8E4F6;padding:38px 0 calc(28px + env(safe-area-inset-bottom))}.footer-top{display:grid;grid-template-columns:220px 1fr;gap:30px}.footer-brand{display:flex;gap:12px;align-items:center}.footer-brand img{height:24px;max-width:140px;object-fit:contain;filter:brightness(0) invert(1)}.footer-brand strong{display:block;color:#fff}.footer-brand span{font-size:12px;color:var(--lilac)}.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.footer-grid h2{font-size:15px;color:#fff;margin:0 0 8px}.footer-grid a{display:block;color:#E8E4F6;font-size:14px;padding:4px 0}.footer-note{border-top:1px solid rgba(255,255,255,.14);margin-top:24px;padding-top:18px;font-size:13px;color:var(--lilac)}.overlay{position:fixed;inset:0;background:rgba(42,45,74,.28);z-index:70;opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.overlay.open{opacity:1;visibility:visible;pointer-events:auto}.menu-panel,.search-panel{position:fixed;z-index:80;left:50%;transform:translateX(-50%) translateY(-8px);top:55px;background:#fff;border:1px solid var(--line);border-top:3px solid transparent;border-image:linear-gradient(90deg,var(--purple),var(--blue)) 1;border-radius:0 0 16px 16px;box-shadow:var(--shadow);opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.menu-panel.open,.search-panel.open{opacity:1;visibility:visible;pointer-events:auto;transform:translateX(-50%) translateY(0)}.menu-panel{width:min(640px,calc(100% - 32px));max-height:360px;overflow:auto;padding:18px}.menu-head,.search-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}.menu-brand{display:flex;align-items:center;gap:10px;color:var(--ink)}.menu-brand img{height:22px;max-width:140px;object-fit:contain}.close-btn{min-width:44px;min-height:44px;border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:12px;cursor:pointer}.menu-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.menu-grid h2{font-size:14px;color:var(--purple);margin:0 0 6px}.menu-grid a{display:block;padding:7px 0;border-bottom:1px solid rgba(42,45,74,.07)}.menu-grid b{display:block;color:var(--ink)}.menu-grid span{display:block;font-size:12px;color:var(--muted)}.search-panel{width:min(420px,calc(100% - 32px));padding:18px}.search-box{min-height:52px;border:1px solid var(--mist);border-radius:12px;background:var(--bg);padding:13px;color:var(--muted)}.preset-links{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.preset-links a{border:1px solid var(--line);border-radius:12px;padding:8px 12px;color:var(--ink)}.mobile-bottom{display:none}.menu-btn:hover,.app-btn:hover,.btn-primary:hover,.btn-secondary:hover,.text-btn:hover,a:hover{filter:brightness(.96)}a:focus-visible,button:focus-visible{outline:3px solid var(--peach);outline-offset:2px}
@media(max-width:820px){.nation-nav{display:none}.site-main{padding-top:68px}.line-inner>span,.text-btn{top:11px}.split,.stack-feature,.stack-feature.reverse,.app-layout,.footer-top{grid-template-columns:1fr}.four-grid{grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1fr 1fr}.menu-panel{top:55px;width:calc(100% - 20px);max-height:60vh}.menu-grid{grid-template-columns:1fr 1fr}.search-panel{top:55px}.mobile-bottom{position:fixed;z-index:60;left:0;right:0;bottom:0;height:calc(50px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);display:grid;grid-template-columns:repeat(5,1fr);background:#fff;border-top:1px solid var(--line)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;font-size:13px;min-width:0}.mobile-bottom a.active{background:var(--purple);color:#fff}.site-footer{padding-bottom:calc(82px + env(safe-area-inset-bottom))}.app-layout .media-slot{height:380px}.cover-slot{height:190px}.feature-card .media-slot,.stack-feature .media-slot{height:160px}}
@media(max-width:520px){.wrap{width:calc(100% - 32px)}.stage-actions{gap:6px}.menu-btn,.app-btn{padding:0 11px}.four-grid,.menu-grid,.footer-grid{grid-template-columns:1fr}.menu-panel{max-height:60vh}.hero,.page-hero{padding-top:26px}.cover-slot{height:170px}.content-card{padding:18px}.section{padding:22px 0}}