:root{--bg:#F4F8FC;--deep:#E8F1FA;--surface:#fff;--secondary:#F7FBFE;--heading:#0E2A44;--text:#1C3A56;--muted:#3D5C78;--subtle:#6A88A0;--blue:#1E6FD9;--bright:#6BA8F0;--dark:#0E4A9E;--amber:#E2B23A;--coral:#E07A62;--border:rgba(30,111,217,.26);--shadow:0 12px 28px rgba(14,42,68,.08)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);font-family:system-ui,-apple-system,"Microsoft YaHei","PingFang SC",sans-serif;color:var(--text);font-size:15px;line-height:1.75;overflow-x:hidden}a{color:var(--dark);text-decoration:none}a:hover{text-decoration:underline}a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--dark);outline-offset:2px}button,input{font:inherit}button{cursor:pointer}h1,h2,h3,p{margin-top:0}h1{font-size:24px;line-height:1.3;color:var(--heading)}h2{font-size:20px;color:var(--heading);line-height:1.4}h3{font-size:16px;color:var(--heading)}p{margin-bottom:16px}.wrap{width:min(960px,calc(100% - 32px));margin:auto}.site-main{padding-top:102px;min-height:60vh}.topbar{height:62px;background:#e3f1fc;border-bottom:3px solid var(--blue);position:fixed;top:0;left:0;width:100%;z-index:100}.topbar-inner{max-width:960px;margin:auto;height:59px;padding:0 16px;display:flex;align-items:center;justify-content:space-between;gap:12px}.brand{min-width:126px;display:flex;align-items:center;gap:6px;text-decoration:none}.brand-image{width:28px;height:28px;display:inline-flex;align-items:center}.logo{height:28px;max-width:78px;object-fit:contain;object-position:center}.brand-lines{display:flex;flex-direction:column;line-height:1.1}.brand-lines strong{font-size:16px;color:var(--heading)}.brand-lines small{font-size:12px;color:var(--dark);letter-spacing:1.8px;margin-top:3px}.brand-pill{height:34px;display:flex;align-items:center;justify-content:center;border:1px solid var(--blue);background:white;border-radius:99px;padding:0 18px;color:var(--heading);white-space:nowrap;font-size:13px}.top-actions{display:flex;gap:8px;flex-shrink:0}.tool-button,.close-button{border:1px solid var(--border);background:#fff;color:var(--heading);min-width:44px;height:44px;border-radius:10px;padding:0 12px;font-size:14px;transition:filter .18s,box-shadow .18s}.tool-button:hover,.close-button:hover{box-shadow:0 0 0 3px rgba(107,168,240,.3)}.primary-toggle{color:#F4F8FC;background:linear-gradient(135deg,#6BA8F0 0%,#1E6FD9 54%,#0E4A9E 100%);box-shadow:0 6px 16px rgba(30,111,217,.24)}.window-nav{height:40px;background:#ebf5fd;position:fixed;top:62px;left:0;width:100%;z-index:90;border-bottom:1px solid var(--border)}.window-nav-inner{max-width:960px;margin:auto;padding:0 16px;display:flex;align-items:center;gap:30px;height:100%}.window-link{display:flex;align-items:center;gap:7px;font-size:13px;color:var(--muted);white-space:nowrap}.window-link.is-active{color:var(--heading);font-weight:700}.window-mark{width:14px;height:14px;border:2px solid var(--blue);border-radius:0 0 0 4px;display:block}.window-link.is-active .window-mark{background:var(--blue);box-shadow:0 6px 16px rgba(30,111,217,.24)}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;border-radius:10px;padding:7px 18px;white-space:nowrap;font-size:14px;font-weight:600;gap:12px;transition:filter .18s,box-shadow .18s,transform .18s}.main-btn{background:linear-gradient(135deg,#6BA8F0 0%,#1E6FD9 54%,#0E4A9E 100%);color:#F4F8FC;box-shadow:0 6px 16px rgba(30,111,217,.24)}.main-btn:hover{color:white;text-decoration:none;filter:brightness(1.08);box-shadow:0 0 0 3px rgba(107,168,240,.5),0 10px 24px rgba(14,74,158,.24)}.btn:active,.tool-button:active{filter:brightness(1.06);box-shadow:0 0 0 4px rgba(226,178,58,.36),0 0 22px rgba(30,111,217,.5)}.secondary-btn{background:#fff;color:var(--heading);border:1px solid var(--border)}.text-link{font-weight:650;border-bottom:1px solid var(--bright);padding-bottom:3px;display:inline-flex;min-height:44px;align-items:center}.eyebrow{font-size:12px;letter-spacing:1.1px;text-transform:uppercase;color:var(--dark);font-weight:700;margin-bottom:12px}.image-slot{background:var(--bg);display:flex;align-items:center;justify-content:center;flex-shrink:0;border:1px solid var(--border);border-radius:14px;overflow:hidden;width:100%;height:160px}.image-slot img{width:100%;height:100%;object-fit:contain;object-position:center}.intro{padding:38px 0 32px;border-bottom:1px solid var(--border)}.intro h1{max-width:640px}.intro .lead{max-width:730px}.home-hen{padding:32px 0 22px}.hen-first{background:#e6f2fb;border-radius:14px;padding:20px 23px;max-width:720px}.hen-first p{margin-bottom:0}.hen-second{display:flex;align-items:center;gap:20px;max-width:780px;margin:18px 0 0 auto;background:#fff;padding:16px 20px;border-radius:14px;border:1px solid var(--border)}.hen-second>div:first-child{flex:1}.slot-hen{width:240px;height:168px}.home-feature{display:flex;align-items:center;justify-content:space-between;gap:26px;background:#fff;border:1px solid var(--border);box-shadow:var(--shadow);border-radius:14px;padding:25px;margin:22px 0}.home-feature-info{flex:1;min-width:0}.home-feature h2{margin-bottom:10px}.home-feature p{color:var(--muted)}.home-feature .slot-wide{width:260px;height:160px}.home-feature .slot-square{width:240px;height:160px}.home-feature:nth-of-type(even){background:var(--secondary)}.home-sheet{flex-direction:row-reverse;border-left:5px solid var(--blue)}.home-wrap-text{display:block;min-height:210px}.home-wrap-text .image-slot{width:240px;height:168px;float:right;margin:0 0 12px 24px}.home-wrap-text::after{content:'';display:block;clear:both}.home-translate{border-left:5px solid var(--amber)}.home-night{background:#e8f1fa}.home-start{border-top:4px solid var(--blue)}.home-extend{border-left:5px solid var(--coral)}.home-cross{flex-direction:row-reverse}.home-keys{background:#e8f1fa}.home-guide{border-bottom:4px solid var(--bright)}.home-app{flex-wrap:wrap;justify-content:flex-start}.home-app .home-feature-info{flex-basis:100%;order:3}.home-app .slot-app{width:240px;height:320px}.home-app .slot-icon{height:80px;width:80px}.home-late,.home-questions,.home-brand{padding:30px 0;border-top:1px solid var(--border)}.question-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-bottom:20px}.question-grid article{background:#fff;border:1px solid var(--border);padding:18px;border-radius:14px}.question-grid p{font-size:14px;margin-bottom:0}.home-brand{display:flex;align-items:center;gap:24px}.brand-content{flex:1}.slot-brand{width:220px;height:160px}.article-wrap{padding-bottom:44px}.breadcrumbs{display:flex;gap:10px;align-items:center;margin:24px 0;color:var(--subtle);font-size:13px}.article-heading{max-width:800px;padding:10px 0 22px}.article-heading p{font-size:15px;line-height:1.9}.feature-panel{background:white;border:1px solid var(--border);border-radius:14px;padding:24px;display:flex;align-items:center;gap:24px;box-shadow:var(--shadow);margin:0 0 24px}.feature-copy{flex:1}.feature-copy p{color:var(--muted)}.feature-panel .hero-slot{width:240px;height:176px}.feature-offset .feature-copy{transform:translateY(-10px)}.feature-horizontal{border-top:5px solid var(--blue)}.feature-text-wrap{display:block;min-height:220px}.feature-text-wrap .hero-slot{float:right;margin:0 0 18px 20px;height:168px}.feature-text-wrap:after{content:'';display:block;clear:both}.feature-status{border-left:6px solid var(--coral)}.feature-page-slab{border-bottom:5px solid var(--blue)}.feature-banner{display:block}.feature-banner .hero-slot{height:200px;width:100%;margin-top:14px}.feature-panel:has(.hero-slot.banner){display:flex;flex-direction:column;align-items:stretch}.feature-panel:has(.hero-slot.banner) .hero-slot{width:100%;height:200px}.feature-panel:has(.hero-slot.text-wrap):not(.feature-banner) .hero-slot{width:240px}.article-app .feature-panel .hero-slot{height:320px}.article-about .feature-panel{flex-direction:column;align-items:stretch}.article-about .hero-slot{width:100%;height:200px}.app-icon-pair{padding-bottom:12px}.icon-slot{width:64px;height:64px}.section-copy,.section-band{padding:24px 0;border-bottom:1px solid var(--border);max-width:850px}.section-band{background:#e9f3fb;border-radius:14px;padding:24px;margin:18px 0;border:0}.section-kicker{color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.7px}.section-copy p,.section-band p{line-height:1.9}.related{padding:25px 0}.related-links{display:flex;flex-wrap:wrap;gap:12px}.related-links a{background:#fff;border:1px solid var(--border);padding:10px 15px;border-radius:10px;min-height:44px}.faq-list{display:grid;gap:14px}.faq-item{background:#fff;border:1px solid var(--border);border-radius:14px;padding:22px}.faq-item>span{font-size:12px;color:var(--blue);font-weight:650}.faq-item h2{font-size:18px;margin:6px 0 9px}.faq-item p{margin:0}.footer{background:var(--heading);border-top:3px solid var(--blue);color:#E8F1FA;padding:30px 0 24px;font-size:13px}.footer-brand{display:flex;align-items:center;gap:12px}.footer-brand>div{display:flex;flex-direction:column;line-height:1.3}.footer-brand strong{font-size:16px}.footer-brand span{font-size:12px;letter-spacing:2px}.footer-columns{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;margin:26px 0}.footer-columns h2{font-size:14px;color:#E8F1FA}.footer-links{display:flex;flex-direction:column;align-items:flex-start;gap:6px}.footer a{color:#E8F1FA;min-height:26px}.footer-notice{border-top:1px solid rgba(255,255,255,.2);padding-top:18px;max-width:780px}.copyright{opacity:.8;margin-bottom:0}.overlay{position:fixed;inset:0;background:rgba(14,42,68,.42);z-index:105;visibility:hidden;pointer-events:none;opacity:0;transition:opacity .18s,visibility .18s}.overlay.visible{visibility:visible;pointer-events:auto;opacity:1}.menu-panel,.search-panel{position:fixed;z-index:110;visibility:hidden;pointer-events:none;opacity:0;transition:opacity .18s,visibility .18s;box-shadow:var(--shadow)}.menu-panel.visible,.search-panel.visible{visibility:visible;pointer-events:auto;opacity:1}.menu-panel{top:73px;left:max(16px,calc((100vw - 960px)/2));width:min(560px,calc(100vw - 32px));max-height:70vh;background:white;border-radius:14px;border-left:8px solid var(--blue);overflow:auto}.panel-heading{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:15px 18px;border-bottom:1px solid var(--border)}.panel-identity{display:flex;align-items:center;gap:10px;color:var(--heading)}.menu-contents{padding:8px 18px 22px}.menu-category{margin-top:12px}.menu-category h2{font-size:15px;margin-bottom:6px}.menu-items{display:grid;grid-template-columns:1fr 1fr;gap:8px}.menu-items a{border:1px solid var(--border);border-radius:10px;padding:9px 11px;display:flex;flex-direction:column;background:var(--secondary);min-height:62px}.menu-items strong{font-size:14px}.menu-items span{font-size:12px;color:var(--muted);line-height:1.5}.search-panel{top:73px;right:max(16px,calc((100vw - 960px)/2));width:min(420px,calc(100vw - 32px));background:#e6f2fb;color:var(--heading);border-radius:14px;border:1px solid var(--border);padding:0 18px 20px}.search-panel .panel-heading{padding-left:0;padding-right:0}.search-panel p{font-size:14px;margin:15px 0}.search-panel input{width:100%;height:44px;border:1px solid var(--blue);border-radius:10px;padding:0 12px;color:var(--heading);background:white}.search-results{display:flex;gap:8px;flex-wrap:wrap;padding-top:14px;max-height:38vh;overflow:auto}.search-results a{display:inline-flex;align-items:center;min-height:42px;padding:5px 14px;background:white;border-radius:9px;border:1px solid var(--border)}.dialog-open{overflow:hidden}.mobile-bottom{display:none}.sr-only{position:absolute;clip:rect(0,0,0,0);width:1px;height:1px;overflow:hidden;white-space:nowrap}
@media(max-width:700px){.site-main{padding-top:62px;padding-bottom:calc(48px + env(safe-area-inset-bottom))}.window-nav{display:none}.brand{min-width:0}.brand-pill{display:none}.topbar-inner{gap:6px}.top-actions{gap:8px}.tool-button{padding:0 10px}.intro{padding-top:28px}.hen-second{display:block}.slot-hen{margin-top:15px;width:100%;max-width:240px}.home-feature{padding:18px;display:block}.home-feature .slot-wide,.home-feature .slot-square{width:100%;max-width:320px;margin-top:15px}.home-wrap-text .image-slot{float:none;margin:16px 0}.home-app .slot-app{width:240px;max-width:100%}.home-app .slot-icon{width:80px}.question-grid{grid-template-columns:1fr}.home-brand{display:block}.slot-brand{margin-top:12px;width:100%}.feature-panel,.feature-panel.feature-text-wrap{display:block;padding:18px}.feature-panel .hero-slot,.feature-text-wrap .hero-slot{float:none!important;width:100%!important;max-width:320px;margin:18px 0 0}.article-about .feature-panel .hero-slot{max-width:none}.footer-columns{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.mobile-bottom{position:fixed;bottom:0;left:0;width:100%;height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);display:grid;grid-template-columns:repeat(4,1fr);z-index:94;background:#e3f1fc;border-top:1px solid var(--border)}.mobile-bottom a{font-size:13px;display:flex;align-items:center;justify-content:center;color:var(--muted);min-height:48px}.mobile-bottom a.is-active{font-weight:750;color:var(--heading);border-top:3px solid var(--blue);box-shadow:inset 0 6px 16px rgba(30,111,217,.24)}.menu-panel{top:70px;left:16px;max-height:72vh}.menu-items{grid-template-columns:1fr}.search-panel{top:0;left:0;right:0;bottom:0;width:100%;border:0;border-radius:0;background:var(--heading);color:#e8f1fa;padding:16px;max-height:none;overflow:auto}.search-panel .panel-heading{border-color:rgba(255,255,255,.25)}.search-panel .panel-heading strong,.search-panel p{color:#e8f1fa}.search-panel input{background:#f4f8fc}.search-results a{color:var(--heading)}.search-results p{color:#e8f1fa}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}

/* Editorial layout refresh; source palette unchanged */
.intro{border-left:5px solid var(--blue);padding-left:24px}.home-feature:nth-of-type(3n){border-radius:22px 14px 22px 14px}.article-heading .eyebrow{letter-spacing:.09em}.home-feature h2{max-width:25ch}.feature-copy{max-width:630px}