:root{--bg:#EEF0F8;--bg-deep:#E0E4F2;--paper:#F7F8FD;--sub:#EBEEF8;--ink:#1A1840;--text:#2C2A48;--muted:#5A5680;--soft:#7A76A0;--purple:#5B4BDB;--blue:#3A6BD4;--dark:#1C1A3A;--mist:#8AA4E0;--lilac:#8A6AD4;--border:rgba(58,107,212,.18);--border-strong:rgba(91,75,219,.42);--shadow:0 12px 28px rgba(28,26,58,.08)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.7 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;overflow-x:hidden}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}.ui-locked{overflow:hidden}.address-bar{position:fixed;z-index:80;top:0;left:0;right:0;height:22px;background:var(--dark);color:#F7F8FD;display:flex;align-items:center;justify-content:space-between;padding:0 max(16px,calc((100vw - 1000px)/2));font-size:12px}.brand-mini{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.search-open{height:22px;padding:0 10px;border:0;background:transparent;color:#F7F8FD}.window-bar{position:fixed;z-index:79;top:22px;left:0;right:0;height:54px;background:#E7E7F5;border-bottom:1px solid var(--border-strong);display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:0 max(16px,calc((100vw - 1000px)/2))}.window-logo{justify-self:start;height:44px;display:flex;align-items:center;min-width:44px;font-size:16px;font-weight:800;color:var(--ink)}.window-logo img,.footer-brand-line img,.drawer-brand img{height:24px;max-width:160px;object-fit:contain;object-position:center}.app-shortcut{justify-self:center;min-height:44px;display:flex;align-items:center;padding:0 18px;border:1px solid var(--border-strong);border-radius:999px;color:var(--ink);background:var(--paper);font-size:14px;font-weight:700}.drawer-open,.drawer-close,.search-close{min-height:44px;padding:0 14px;border:1px solid var(--border-strong);border-radius:10px;background:var(--paper);color:var(--ink);font-weight:700}.drawer-open{justify-self:end}.section-tabs{position:fixed;z-index:78;top:76px;left:0;right:0;min-height:42px;background:#F7F8FD;border-bottom:1px solid var(--border);display:flex;align-items:center;padding:5px 16px}.tab-wrap{width:min(1000px,100%);margin:auto;display:flex;justify-content:center;gap:8px;flex-wrap:wrap}.tab-pill{min-height:32px;display:flex;align-items:center;padding:0 14px;border-radius:999px;border:1px solid var(--border);background:var(--sub);color:var(--ink);font-size:13px}.tab-pill.is-current{background:var(--purple);color:#fff;border-color:var(--purple)}.site-main{padding:142px 16px 54px}.container{width:min(1000px,100%);margin:0 auto}.page-hero{margin-bottom:24px}.eyebrow{font-size:13px;color:var(--purple);font-weight:800;letter-spacing:.05em}.page-hero h1,.home-hero h1{font-size:24px;line-height:1.3;margin:8px 0 12px;color:var(--ink)}h2{font-size:20px;line-height:1.35;color:var(--ink);margin:0 0 12px}h3{font-size:16px;line-height:1.45;color:var(--ink);margin:0 0 8px}p{margin:0 0 14px}.lead{font-size:16px;color:var(--muted);max-width:760px}.btn-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.btn{min-height:42px;display:inline-flex;align-items:center;justify-content:center;padding:0 18px;border-radius:10px;font-size:14px;font-weight:800}.btn-primary{color:#F7F8FD;background:linear-gradient(135deg,#8AA4E0 0%,#5B4BDB 55%,#3A6BD4 100%)}.btn-secondary{background:var(--paper);border:1px solid var(--border-strong);color:var(--dark)}a:hover,.btn:hover{filter:brightness(.98)}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid rgba(91,75,219,.32);outline-offset:2px}.surface{background:var(--paper);border:1px solid var(--border);box-shadow:var(--shadow);border-radius:14px}.image-slot{background:linear-gradient(135deg,#F7F8FD,#E9ECF8);border:1px solid var(--border);border-radius:12px;display:flex;align-items:center;justify-content:center;overflow:hidden}.image-slot img{width:100%;height:100%;object-fit:contain;object-position:center}.slot-banner{height:168px}.slot-wide{height:176px}.slot-app{height:320px;max-width:310px;margin:0 auto}.home-hero{width:min(1000px,100%);margin:0 auto 28px}.home-hero-card{max-width:820px;padding:16px}.home-copy{padding:20px 4px 0}.home-copy p{max-width:760px}.section-block{width:min(1000px,100%);margin:0 auto 28px}.section-block>.section-head{display:flex;justify-content:space-between;gap:18px;align-items:end;margin-bottom:12px}.section-head p{margin:0;max-width:620px;color:var(--muted)}.long-copy{padding:20px}.long-copy .image-slot{margin-bottom:18px}.stair-stack{display:flex;flex-direction:column;gap:12px}.stair-card{width:min(760px,100%);padding:18px}.stair-card:nth-child(2){margin-left:24px}.tag-wrap{display:flex;flex-wrap:wrap;gap:9px;margin:14px 0}.tag{display:inline-flex;min-height:36px;align-items:center;padding:0 13px;border-radius:999px;background:var(--sub);border:1px solid var(--border);font-weight:700;color:var(--ink)}.tag.active{background:var(--purple);color:#fff}.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.compare-card{padding:18px}.compare-card .image-slot{height:170px;margin-bottom:14px}.path-strip{padding:20px}.path-items{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:10px}.path-items span{padding:9px 13px;border-radius:10px;background:var(--sub);border:1px solid var(--border);font-weight:800;color:var(--ink)}.path-items i{font-style:normal;color:var(--soft)}.center-pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;max-width:760px;margin:0 auto}.center-card{padding:20px;text-align:center}.product-card{max-width:760px;margin:0 auto;padding:22px;display:grid;grid-template-columns:300px 1fr;gap:24px;align-items:center}.product-icon{width:48px;height:48px;object-fit:contain;display:block;margin:0 0 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p{max-width:820px;color:#DCE2F5;font-size:13px;margin-top:10px}.footer-links{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin:24px 0}.footer-links h2{font-size:14px;color:#fff}.footer-links a{display:block;font-size:13px;color:#DCE2F5;padding:4px 0}.copyright{font-size:13px;color:#BFC8EA;border-top:1px solid rgba(138,164,224,.25);padding-top:14px}.overlay{position:fixed;z-index:90;inset:0;background:rgba(28,26,58,.38);opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.overlay.is-active{opacity:1;visibility:visible;pointer-events:auto}.tool-drawer{position:fixed;z-index:95;right:18px;bottom:18px;width:360px;max-height:70vh;background:var(--paper);border:1px solid var(--border-strong);box-shadow:0 20px 50px rgba(28,26,58,.2);border-radius:14px;transform:translateY(24px);opacity:0;visibility:hidden;pointer-events:none;transition:.2s;display:flex;flex-direction:column}.tool-drawer.is-open{transform:none;opacity:1;visibility:visible;pointer-events:auto}.drawer-head{padding:12px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border)}.drawer-brand{display:flex;align-items:center;gap:9px}.drawer-brand div{display:flex;flex-direction:column}.drawer-brand span{font-size:11px;color:var(--soft)}.drawer-scroll{overflow:auto;padding:10px 12px 14px}.drawer-group{margin-bottom:12px}.drawer-group h2{font-size:13px;color:var(--soft);margin:6px 0}.drawer-group a{display:grid;grid-template-columns:92px 1fr;gap:8px;padding:8px;border-radius:9px}.drawer-group a:hover{background:var(--sub)}.drawer-group strong{font-size:14px;color:var(--ink)}.drawer-group 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@media(max-width:760px){.address-bar{padding:0 10px}.window-bar{padding:0 10px;grid-template-columns:minmax(0,1fr) auto auto;gap:6px}.window-logo{min-width:0;overflow:hidden}.window-logo img{max-width:120px}.app-shortcut,.drawer-open{padding:0 10px;min-width:44px}.section-tabs{display:none}.site-main{padding:92px 16px 78px}.home-hero-card{padding:12px}.compare-grid,.center-pair,.product-card,.article-grid,.split-page{grid-template-columns:1fr}.product-card{padding:18px}.article-aside{position:static}.stair-card:nth-child(2){margin-left:0}.footer-links{grid-template-columns:1fr 1fr}.tool-drawer{right:4%;bottom:60px;width:92%;max-height:70vh}.search-layer{top:0;bottom:0;background:var(--dark)}.search-card{width:100%;height:100%;margin:0;border:0;border-radius:0;background:var(--dark);color:#F7F8FD;padding:84px 16px 72px}.search-card label,.search-empty{color:#DCE2F5}.search-head strong{color:#fff}.search-close{background:transparent;color:#fff;border-color:rgba(255,255,255,.35)}.search-presets a{background:#29264E;color:#fff;border-color:rgba(255,255,255,.18)}.mobile-bottom{position:fixed;z-index:77;left:0;right:0;bottom:0;height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);display:grid;grid-template-columns:repeat(4,1fr);background:var(--paper);border-top:1px solid var(--border-strong)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:800}.mobile-bottom a.is-current{background:var(--purple);color:#fff}.site-footer{padding-bottom:calc(72px + env(safe-area-inset-bottom))}.tool-row{grid-template-columns:1fr}.slot-app{height:300px}.page-hero h1,.home-hero h1{font-size:24px}.section-block>.section-head{display:block}.drawer-group a{grid-template-columns:88px 1fr}}
@media(max-width:420px){.footer-links{grid-template-columns:1fr}.app-shortcut{font-size:13px;padding:0 8px}.drawer-open{font-size:13px;padding:0 8px}.brand-mini{max-width:75%}}