:root{
    --bg:#EEF0F8;--deep-bg:#E0E4F2;--panel:#F7F8FD;--sub:#EBEEF8;--title:#1A1840;--text:#2C2A48;--muted:#5A5680;--soft:#7A76A0;
    --purple:#5B4BDB;--blue:#3A6BD4;--deep:#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;overflow-x:hidden}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;font-size:15px;line-height:1.7;overflow-x:hidden}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
button{cursor:pointer}
img{max-width:100%;height:auto;object-fit:contain;object-position:center;display:block}
.skip-link{position:fixed;left:12px;top:-80px;z-index:1000;background:var(--panel);color:var(--deep);padding:8px 12px;border-radius:8px;border:1px solid var(--border-strong)}
.skip-link:focus{top:8px}
.address-bar{position:fixed;top:0;left:0;right:0;height:22px;background:var(--deep);color:#F7F8FD;z-index:90;font-size:12px}
.bar-inner,.head-inner,.tab-inner,.site-main,.footer-inner{width:min(1000px,calc(100% - 32px));margin:0 auto}
.bar-inner{height:22px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.address-brand{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.text-button{border:0;background:transparent;color:#F7F8FD;padding:0 4px;min-height:22px}
.window-head{position:fixed;top:22px;left:0;right:0;height:54px;background:#EBEEF8;border-bottom:1px solid var(--border-strong);z-index:88}
.head-inner{height:54px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px}
.brand-link{justify-self:start;display:flex;align-items:center;min-height:44px;max-width:220px}.brand-logo{height:24px;width:auto}.brand-fallback{font-size:16px;font-weight:800;color:var(--title)}
.app-link{justify-self:center;font-size:14px;font-weight:700;color:var(--purple);min-height:44px;display:flex;align-items:center;padding:0 12px;border-radius:10px}
.drawer-open{justify-self:end;min-height:44px;padding:0 14px;border:1px solid var(--border-strong);background:var(--panel);color:var(--deep);border-radius:10px;font-size:14px;font-weight:700}
.tab-strip{position:fixed;top:76px;left:0;right:0;height:42px;background:var(--panel);z-index:84;border-bottom:1px solid var(--border)}
.tab-inner{min-height:42px;display:flex;align-items:center;justify-content:center;gap:7px;flex-wrap:wrap;overflow:visible}
.tab-inner a{font-size:13px;line-height:30px;padding:0 13px;border:1px solid var(--border);border-radius:999px;color:var(--deep);background:#fff;white-space:nowrap}
.tab-inner a.active{background:var(--purple);color:#F7F8FD;border-color:var(--purple)}
.site-main{padding-top:144px;padding-bottom:72px;min-height:70vh}
h1,h2,h3{color:var(--title);margin-top:0}h1{font-size:24px;line-height:1.3;margin-bottom:14px}h2{font-size:20px;line-height:1.35;margin-bottom:12px}h3{font-size:16px;line-height:1.45;margin-bottom:8px}p{margin:0 0 14px}
.eyebrow{font-size:12px;letter-spacing:.08em;color:var(--purple);font-weight:800;margin-bottom:8px}.lead{font-size:16px;color:var(--muted)}
.page-intro{margin-bottom:28px}.page-intro p{max-width:760px}
.button-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.btn{height:42px;display:inline-flex;align-items:center;justify-content:center;padding:0 18px;border-radius:11px;font-size:14px;font-weight:800;border:1px solid transparent;white-space:nowrap}.btn-primary{background:linear-gradient(135deg,#8AA4E0 0%,#5B4BDB 55%,#3A6BD4 100%);color:#F7F8FD}.btn-secondary{background:var(--panel);border-color:var(--border-strong);color:var(--deep)}
a:hover,.text-button:hover,button:hover{filter:brightness(.98)}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid rgba(91,75,219,.28);outline-offset:2px}
.panel{background:var(--panel);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow)}
.media-slot{background:linear-gradient(145deg,#EBEEF8,#F7F8FD);border:1px solid var(--border);border-radius:12px;display:flex;align-items:center;justify-content:center;overflow:hidden}.media-slot img{width:100%;height:100%;object-fit:contain}.slot-168{height:168px}.slot-176{height:176px}.slot-220{height:220px}.slot-300{height:300px}.slot-app{height:min(320px,52vw);min-height:240px}
.section{margin:44px 0}.section-head{margin-bottom:18px}.section-head p{max-width:760px;color:var(--muted)}
/* 首页 */
.hero-frame{display:grid;grid-template-columns:1fr;gap:18px;background:var(--panel);border:1px solid var(--border-strong);border-radius:14px;padding:18px;box-shadow:var(--shadow)}.hero-copy{max-width:760px}.hero-copy p{max-width:720px}
.long-read{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(260px,.8fr);gap:20px;align-items:center}.long-read .text{padding:6px 0}.long-read .media-slot{order:2}
.stair-stack{display:grid;gap:12px;max-width:820px}.stair-card{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:16px;box-shadow:var(--shadow)}.stair-card:nth-child(2){margin-left:24px}.stair-card .media-slot{margin-bottom:14px}
.tag-wrap{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0}.tag-wrap span,.tag-wrap a{padding:8px 13px;border-radius:999px;background:var(--sub);border:1px solid var(--border);color:var(--deep);font-weight:700}
.tag-panel{padding:18px}.tag-panel .media-slot{margin-top:16px}
.dual-compare{display:grid;grid-template-columns:1fr 1fr;gap:16px}.compare-pane{padding:18px}.compare-pane .media-slot{margin-bottom:14px}
.path-card{padding:20px}.path-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:14px 0}.path-step{background:var(--deep);color:#F7F8FD;border-radius:10px;padding:8px 13px}.path-arrow{color:var(--soft)}
.center-cards{display:grid;grid-template-columns:1fr 1fr;gap:16px;max-width:760px;margin:0 auto}.center-card{padding:18px;text-align:center}.center-card .media-slot{margin-bottom:14px}
.product-card{max-width:800px;margin:0 auto;display:grid;grid-template-columns:280px 1fr;gap:22px;align-items:center;padding:20px}.product-art{position:relative}.product-icon{position:absolute;right:12px;bottom:12px;width:48px;height:48px;border-radius:12px;background:var(--panel);padding:4px;border:1px solid var(--border)}
.info-list{display:grid;gap:12px}.info-item{padding:15px 16px;background:var(--panel);border:1px solid var(--border);border-radius:11px}.faq-mini{display:grid;gap:12px}.faq-mini details{background:var(--panel);border:1px solid var(--border);border-radius:11px;padding:12px 15px}.faq-mini summary{font-weight:800;color:var(--title);cursor:pointer}.faq-mini p{margin:10px 0 0}
.brand-block{display:grid;grid-template-columns:220px 1fr;gap:20px;align-items:center;padding:20px}
/* 内页版式 */
.window-demo{padding:18px}.window-demo .chrome{background:var(--deep);color:#F7F8FD;border-radius:10px 10px 0 0;padding:10px 14px;font-size:13px}.window-demo .window-body{background:#fff;border:1px solid var(--border);border-top:0;border-radius:0 0 10px 10px;padding:18px}.window-body .media-slot{margin-bottom:16px}
.steps-layout{display:grid;gap:14px}.step-card{padding:18px}.step-card:nth-child(2){margin-left:34px}.step-card:nth-child(3){margin-left:68px}.step-card .media-slot{margin-bottom:14px}
.tags-layout{padding:20px}.tag-copy{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:16px}.tag-copy article{background:#fff;border:1px solid var(--border);border-radius:11px;padding:14px}
.reading-layout{display:grid;grid-template-columns:220px 1fr;gap:18px}.reading-controls{padding:18px;align-self:start}.reading-controls span{display:block;padding:9px 11px;border-radius:9px;background:var(--sub);margin-bottom:8px;color:var(--deep);font-weight:700}.reading-article{padding:22px}
.tool-list-layout{display:grid;gap:12px}.tool-row{display:grid;grid-template-columns:160px 1fr;gap:18px;align-items:start;padding:17px}.tool-row strong{color:var(--title)}
.compare-layout{display:grid;grid-template-columns:1fr 1fr;gap:16px}.compare-column{padding:20px}.compare-column.primary{border-color:var(--border-strong)}
.route-layout{padding:20px}.route-sequence{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.route-node{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:16px}.route-node strong{display:block;color:var(--title);margin-bottom:6px}
.memo-layout{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.memo-note{padding:18px;position:relative}.memo-note:before{content:"";position:absolute;left:18px;top:0;width:44px;height:4px;background:var(--lilac);border-radius:0 0 6px 6px}
.center-info{max-width:760px;margin:0 auto;text-align:center}.center-info .media-slot{margin-bottom:16px}.center-info-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:16px;text-align:left}.center-info-grid article{padding:17px}
.terms-layout{display:grid;gap:16px}.term-block{padding:20px}.term-block h2{border-bottom:1px solid var(--border);padding-bottom:10px}
.install-layout{display:grid;gap:0}.install-step{display:grid;grid-template-columns:52px 1fr;gap:14px;padding:0 0 20px}.install-step .num{width:42px;height:42px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:var(--purple);color:#fff;font-weight:900}.install-step .copy{border-left:1px solid var(--border-strong);padding:0 0 10px 18px;margin-left:-10px}
.help-layout{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.help-card{padding:18px}.help-card a{color:var(--purple);font-weight:800}
.faq-page{display:grid;gap:12px}.faq-page details{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:14px 16px}.faq-page summary{cursor:pointer;color:var(--title);font-weight:800}.faq-page p{margin-top:12px}
.contact-layout{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.contact-card{padding:20px}.contact-card p:last-child{margin-bottom:0}.contact-note{margin-top:18px;padding:18px;background:var(--deep);color:#F7F8FD;border-radius:12px}.contact-note h2{color:#F7F8FD}
.about-layout{display:grid;grid-template-columns:260px 1fr;gap:22px;align-items:start}.about-copy{padding:20px}.about-values{display:grid;gap:12px;margin-top:16px}.about-values article{background:var(--sub);border-radius:10px;padding:14px}
/* 页脚 */
.site-footer{background:var(--deep);color:#EEF0F8;border-top:1px solid rgba(138,164,224,.45);padding:34px 0 calc(28px + env(safe-area-inset-bottom));font-size:13px}.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:24px}.footer-logo{height:24px;width:auto}.footer-brand strong{display:block;font-size:16px;color:#F7F8FD}.footer-brand span{color:#C8D1F0}.footer-groups{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.footer-groups h2{font-size:13px;color:#F7F8FD;margin:0 0 8px}.footer-groups a{display:block;color:#DCE4FA;padding:4px 0}.footer-note{margin-top:24px;color:#C8D1F0;max-width:820px}.copyright{margin:10px 0 0;color:#AEB8DA}
/* 工具屉与搜索 */
.overlay{position:fixed;inset:0;background:rgba(28,26,58,.38);opacity:0;pointer-events:none;transition:opacity .18s ease;z-index:120}.overlay.show{opacity:1;pointer-events:auto}.tool-drawer{position:fixed;right:18px;bottom:18px;width:360px;max-height:70vh;background:var(--panel);border:1px solid var(--border-strong);border-radius:14px;box-shadow:0 24px 60px rgba(28,26,58,.22);z-index:130;transform:translateY(24px) scale(.98);opacity:0;visibility:hidden;pointer-events:none;transition:.18s ease;overflow:hidden}.tool-drawer.open{transform:none;opacity:1;visibility:visible;pointer-events:auto}.drawer-head{height:58px;display:flex;align-items:center;justify-content:space-between;padding:0 14px;border-bottom:1px solid var(--border)}.drawer-brand{display:flex;align-items:center;gap:8px}.drawer-logo{height:24px;width:auto}.drawer-close,.search-close{min-height:40px;padding:0 12px;border:1px solid var(--border);border-radius:9px;background:#fff;color:var(--deep)}.drawer-scroll{overflow:auto;max-height:calc(70vh - 58px);padding:12px}.drawer-scroll section+section{margin-top:12px}.drawer-scroll h2{font-size:13px;margin:0 0 7px;color:var(--soft)}.drawer-scroll a{display:block;padding:10px 11px;border-radius:10px}.drawer-scroll a:hover{background:var(--sub)}.drawer-scroll strong{display:block;color:var(--title);font-size:14px}.drawer-scroll span{display:block;color:var(--muted);font-size:12px;line-height:1.5;margin-top:2px}
.search-layer{position:fixed;left:50%;top:86px;transform:translateX(-50%) translateY(-10px);width:min(760px,calc(100% - 32px));z-index:132;opacity:0;visibility:hidden;pointer-events:none;transition:.18s ease}.search-layer.open{opacity:1;visibility:visible;pointer-events:auto;transform:translateX(-50%) translateY(0)}.search-card{background:#EBEEF8;border:1px solid var(--border-strong);border-radius:14px;box-shadow:0 24px 60px rgba(28,26,58,.2);padding:16px}.search-top{display:flex;align-items:start;justify-content:space-between;gap:12px}.search-top strong{font-size:18px;color:var(--title)}.search-top p{margin:2px 0 0;color:var(--muted)}.search-form{margin-top:12px}.search-form label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px}.search-form input{width:100%;height:44px;border:1px solid var(--border-strong);border-radius:10px;background:#fff;color:var(--deep);padding:0 12px}.search-hint{font-size:12px;color:var(--soft);margin:6px 0 0}.search-presets{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.search-presets a{background:#fff;border:1px solid var(--border);border-radius:999px;padding:8px 12px;font-weight:700;color:var(--deep)}
.mobile-bottom{display:none}.modal-open{overflow:hidden}
@media (max-width:760px){
    .bar-inner,.head-inner,.site-main,.footer-inner{width:calc(100% - 32px)}
    .tab-strip{display:none}.site-main{padding-top:102px;padding-bottom:84px}.address-bar{height:22px}.window-head{top:22px}.head-inner{grid-template-columns:minmax(0,1fr) auto auto;gap:6px}.brand-link{min-width:0}.brand-logo{max-width:122px}.brand-fallback{font-size:15px;white-space:nowrap}.app-link,.drawer-open{padding:0 9px;font-size:13px}.drawer-open{min-width:62px}
    .hero-frame,.long-read,.product-card,.brand-block,.reading-layout,.about-layout{grid-template-columns:1fr}.long-read .media-slot{order:0}.stair-card:nth-child(2),.step-card:nth-child(2),.step-card:nth-child(3){margin-left:0}.dual-compare,.center-cards,.compare-layout,.tag-copy,.center-info-grid,.memo-layout,.help-layout,.contact-layout{grid-template-columns:1fr}.route-sequence{grid-template-columns:1fr}.tool-row{grid-template-columns:1fr;gap:6px}.product-card{padding:16px}.slot-app{height:300px}.brand-block{padding:16px}.about-layout .media-slot{height:220px}
    .footer-groups{grid-template-columns:repeat(2,1fr)}
    .tool-drawer{right:4%;bottom:calc(58px + env(safe-area-inset-bottom));width:92%;max-height:70vh}.drawer-scroll{max-height:calc(70vh - 58px)}
    .search-layer{inset:0;width:100%;transform:none;background:var(--deep);padding:calc(28px + env(safe-area-inset-top)) 16px 76px;overflow:auto}.search-layer.open{transform:none}.search-card{min-height:100%;background:var(--deep);color:#F7F8FD;border:0;box-shadow:none;padding:12px 0}.search-top strong,.search-top p,.search-form label,.search-hint{color:#F7F8FD}.search-form input{background:#F7F8FD}.search-presets a{background:#F7F8FD}.search-close{background:#F7F8FD}
    .mobile-bottom{position:fixed;display:grid;grid-template-columns:repeat(4,1fr);left:0;right:0;bottom:0;height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:var(--panel);border-top:1px solid var(--border-strong);z-index:92}.mobile-bottom a{display:flex;align-items:center;justify-content:center;min-height:48px;font-size:13px;font-weight:700;color:var(--deep)}.mobile-bottom a.active{background:var(--purple);color:#F7F8FD}
}
@media (max-width:420px){.address-brand{max-width:230px}.footer-groups{grid-template-columns:1fr 1fr}.slot-app{height:280px}}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}