:root{
    --bg:#EEF0F8;--deep-bg:#E0E4F2;--surface:#F7F8FD;--surface-2:#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);--focus:rgba(91,75,219,.42);--shadow:0 12px 28px rgba(28,26,58,.08);
    --max:1000px;
}
*{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","Microsoft YaHei","PingFang SC",Arial,sans-serif;font-size:15px;line-height:1.7;overflow-x:hidden}
a{color:inherit;text-decoration:none}
a,button,input{font:inherit}
button{border:0;cursor:pointer}
img{display:block;max-width:100%;height:auto}
body.locked{overflow:hidden}
.fixed-shell{position:fixed;inset:0 0 auto;z-index:60}
.address-bar{height:22px;background:var(--deep);color:#EEF0F8;font-size:12px}
.shell-row{width:min(var(--max),calc(100% - 32px));margin:0 auto}
.address-row{height:22px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.text-button{background:transparent;color:#EEF0F8;padding:0 4px;height:22px}
.window-masthead{height:54px;background:#E8E5FA;border-bottom:1px solid var(--border)}
.masthead-row{height:54px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:14px}
.brand-link{justify-self:start;min-height:44px;display:flex;align-items:center;min-width:0}
.brand-logo,.drawer-logo,.footer-logo{height:24px;width:auto;object-fit:contain;object-position:center}
.brand-text{font-size:16px;font-weight:800;color:var(--title);white-space:nowrap}
.app-open-link{justify-self:center;display:inline-flex;align-items:center;min-height:44px;padding:0 18px;border:1px solid var(--focus);border-radius:12px;color:var(--deep);background:var(--surface)}
.drawer-button{justify-self:end;min-height:44px;padding:0 16px;border-radius:12px;border:1px solid var(--focus);background:var(--surface);color:var(--deep)}
.section-tabs{height:42px;background:var(--surface);border-bottom:1px solid var(--border);display:flex;align-items:center}
.tab-wrap{width:min(var(--max),calc(100% - 32px));margin:auto;display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:6px}
.section-tab{font-size:13px;line-height:30px;min-height:30px;padding:0 14px;border:1px solid var(--border);border-radius:999px;color:var(--muted);background:var(--surface-2)}
.section-tab.active{background:var(--purple);color:#F7F8FD;border-color:var(--purple)}
.site-main{padding:150px 16px 76px;min-height:75vh}
.content-wrap{width:min(var(--max),100%);margin:0 auto}
.page-hero{padding:26px 0 18px}
.eyebrow{display:inline-flex;align-items:center;min-height:28px;padding:0 10px;border-radius:999px;background:#E3E0FA;color:var(--deep);font-size:12px;border:1px solid var(--border);margin-bottom:10px}
h1,h2,h3{color:var(--title);margin-top:0}h1{font-size:24px;line-height:1.3;margin-bottom:12px}h2{font-size:20px;line-height:1.4;margin-bottom:10px}h3{font-size:16px;line-height:1.45;margin-bottom:8px}p{margin:0 0 14px}
.lead{font-size:16px;line-height:1.75;color:var(--muted);max-width:820px}
.section-block{margin:24px 0 34px}
.section-head{margin-bottom:14px;max-width:760px}
.section-head p{color:var(--muted)}
.media-slot{background:linear-gradient(135deg,#E4E7F6,#F7F8FD);border:1px solid var(--border);border-radius:14px;min-height:132px;display:flex;align-items:center;justify-content:center;overflow:hidden}
.media-slot img{width:100%;height:100%;object-fit:contain;object-position:center}
.slot-banner{height:168px}.slot-wide{height:176px}.slot-app{height:320px}.slot-medium{height:210px}.slot-small{height:160px}
.primary-btn,.secondary-btn{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:0 18px;border-radius:12px;font-size:14px;white-space:nowrap;transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}
.primary-btn{color:#F7F8FD;background:linear-gradient(135deg,#8AA4E0 0%,#5B4BDB 55%,#3A6BD4 100%);box-shadow:var(--shadow)}
.secondary-btn{color:var(--deep);background:var(--surface);border:1px solid var(--focus)}
.primary-btn:hover,.secondary-btn:hover{transform:translateY(-1px);box-shadow:0 10px 22px rgba(28,26,58,.11)}
a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid rgba(91,75,219,.26);outline-offset:2px}
.hero-window{display:grid;gap:16px;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:16px;box-shadow:var(--shadow)}
.hero-copy{padding:2px 2px 4px}.hero-copy .actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.long-copy{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:20px;box-shadow:var(--shadow)}
.long-copy .media-slot{margin-bottom:16px}
.stair-stack{display:grid;gap:12px;max-width:780px}
.stair-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:18px;box-shadow:var(--shadow)}
.stair-card.offset{margin-left:24px}.stair-card .media-slot{margin-bottom:14px}
.tag-panel{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:20px}
.tags{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0}
.tag{display:inline-flex;align-items:center;min-height:38px;padding:0 14px;border-radius:999px;background:#E5E8F7;color:var(--deep);border:1px solid var(--border);font-weight:700}
.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.compare-card{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:16px;box-shadow:var(--shadow)}
.compare-card .media-slot{margin-bottom:14px}
.path-strip{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:14px 0}
.path-step{display:inline-flex;align-items:center;min-height:42px;padding:0 16px;border-radius:12px;background:#E4E7F6;color:var(--deep);border:1px solid var(--border);font-weight:700}
.path-arrow{color:var(--soft);font-weight:700}
.top-gap{margin-top:16px}
.center-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;max-width:760px;margin:0 auto}
.center-card{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:22px;text-align:center;box-shadow:var(--shadow)}
.product-card{max-width:760px;margin:0 auto;background:var(--surface);border:1px solid var(--focus);border-radius:14px;padding:22px;box-shadow:var(--shadow)}
.product-visual{display:grid;grid-template-columns:96px 1fr;gap:18px;align-items:start;margin-bottom:18px}.app-icon-slot{height:72px;min-height:72px}.app-icon-slot img{max-width:48px;max-height:48px}.product-card .slot-app{margin-top:16px}
.facts-list,.tool-list,.memo-list,.help-list{display:grid;gap:10px}
.fact-row,.tool-row,.memo-row,.help-row{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:16px}.fact-row strong,.tool-row strong,.memo-row strong,.help-row strong{display:block;color:var(--title);margin-bottom:4px}
.window-demo{background:var(--deep);color:#F7F8FD;border-radius:14px;padding:14px;box-shadow:var(--shadow)}
.window-demo .chrome{height:32px;border-radius:10px 10px 0 0;background:#312E59;display:flex;align-items:center;padding:0 12px;gap:6px}.window-demo .dot{width:8px;height:8px;border-radius:50%;background:#8AA4E0}.window-demo .pane{background:var(--surface);color:var(--text);padding:20px;border-radius:0 0 10px 10px}.window-demo .media-slot{margin-bottom:14px}
.reading-sheet{max-width:760px;margin:0 auto;background:var(--surface);border:1px solid var(--border);padding:28px;border-radius:14px;box-shadow:var(--shadow)}
.reading-sheet .media-slot{margin-bottom:18px}.reading-sheet p{max-width:690px}
.tool-list{grid-template-columns:repeat(2,minmax(0,1fr))}.tool-row{min-height:150px}
.split-layout{display:grid;grid-template-columns:1.08fr .92fr;gap:16px}.split-main,.split-side{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:20px;box-shadow:var(--shadow)}.split-main .media-slot{margin-bottom:14px}.split-side{align-self:start;background:#E7EAF7}
.route-board{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:22px}.route-line{display:grid;grid-template-columns:130px 1fr;gap:16px;padding:14px 0;border-bottom:1px solid var(--border)}.route-line:last-child{border-bottom:0}.route-line b{color:var(--title)}
.memo-list{counter-reset:memo}.memo-row{position:relative;padding-left:56px}.memo-row::before{counter-increment:memo;content:counter(memo,decimal-leading-zero);position:absolute;left:16px;top:16px;color:var(--purple);font-weight:800}
.legal-sections{display:grid;gap:14px}.legal-section{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:20px}.legal-section h2{padding-bottom:8px;border-bottom:1px solid var(--border)}
.install-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.install-card{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:20px}
.help-list{grid-template-columns:repeat(2,minmax(0,1fr))}
.faq-list{display:grid;gap:12px}.faq-item{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:18px}.faq-item h2{font-size:17px;margin-bottom:8px}.faq-item p{margin-bottom:0}
.contact-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.contact-card{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:20px}.contact-card a{color:var(--purple);font-weight:700}
.brand-statement{background:linear-gradient(135deg,#E2E4F5,#F7F8FD);border:1px solid var(--focus);border-radius:14px;padding:24px;box-shadow:var(--shadow)}.brand-statement .media-slot{margin-bottom:18px}
.notice-box{background:#E5E9F7;border:1px solid var(--border);border-radius:12px;padding:16px;color:var(--deep)}
.inline-links{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.site-footer{background:var(--deep);color:#EEF0F8;border-top:1px solid rgba(138,164,224,.38);font-size:13px;padding:34px 16px 72px}
.footer-inner{width:min(var(--max),100%);margin:0 auto}.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:24px}.footer-brand strong,.footer-brand span{display:block}.footer-brand span{color:#BFC7E4}.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}.footer-grid h2{font-size:13px;color:#F7F8FD;margin-bottom:8px}.footer-grid a{display:block;color:#D6DCF2;min-height:28px;padding:2px 0}.footer-note{margin-top:24px;color:#C7CDE7;max-width:860px}.copyright{margin-bottom:0;color:#AEB8D8}
.screen-overlay{position:fixed;inset:0;background:rgba(28,26,58,.45);z-index:79;opacity:0;visibility:hidden;pointer-events:none;transition:.2s ease}.screen-overlay.open{opacity:1;visibility:visible;pointer-events:auto}
.tool-drawer{position:fixed;right:20px;bottom:20px;z-index:80;width:360px;max-height:70vh;background:var(--surface);border:1px solid var(--focus);border-radius:16px;box-shadow:0 20px 52px rgba(28,26,58,.24);padding:16px;overflow:auto;opacity:0;visibility:hidden;pointer-events:none;transform:translateY(12px);transition:.2s ease}.tool-drawer.open{opacity:1;visibility:visible;pointer-events:auto;transform:translateY(0)}
.drawer-head,.search-top{display:flex;align-items:center;justify-content:space-between;gap:12px}.drawer-brand{display:flex;align-items:center;gap:10px}.icon-button{min-height:44px;padding:0 14px;border-radius:10px;background:#E7E8F4;color:var(--deep);border:1px solid var(--border)}.drawer-groups section{margin-top:14px}.drawer-groups h2{font-size:13px;margin-bottom:6px;color:var(--muted)}.drawer-groups a{display:block;padding:10px 11px;border-radius:10px}.drawer-groups a:hover{background:#E8EAF6}.drawer-groups b,.drawer-groups span{display:block}.drawer-groups b{color:var(--title)}.drawer-groups span{font-size:12px;color:var(--muted);margin-top:2px}
.search-layer{position:fixed;z-index:80;top:76px;left:0;right:0;opacity:0;visibility:hidden;pointer-events:none;transform:translateY(-10px);transition:.2s ease}.search-layer.open{opacity:1;visibility:visible;pointer-events:auto;transform:translateY(0)}.search-card{width:min(var(--max),calc(100% - 32px));margin:0 auto;background:#E5E2F6;border:1px solid var(--focus);border-radius:0 0 16px 16px;padding:18px;box-shadow:var(--shadow)}.search-card label{display:block;margin:14px 0 8px;color:var(--muted)}.search-card input{width:100%;height:44px;border:1px solid var(--focus);border-radius:10px;background:var(--surface);color:var(--text);padding:0 12px}.search-presets{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.search-presets a{display:inline-flex;align-items:center;min-height:40px;padding:0 14px;border-radius:999px;background:var(--surface);border:1px solid var(--border);color:var(--deep)}.search-empty{margin-top:12px;color:var(--muted)}
.mobile-bottom{display:none}
@media (max-width:720px){
    .section-tabs{display:none}.site-main{padding-top:104px;padding-bottom:82px}.shell-row{width:calc(100% - 24px)}
    .masthead-row{grid-template-columns:minmax(0,1fr) auto auto;gap:8px}.app-open-link,.drawer-button{padding:0 12px}.brand-logo{max-width:116px}.brand-text{font-size:15px}
    .compare-grid,.center-cards,.tool-list,.split-layout,.install-grid,.help-list,.contact-grid{grid-template-columns:1fr}.stair-card.offset{margin-left:0}.route-line{grid-template-columns:1fr;gap:4px}.product-visual{grid-template-columns:72px 1fr}.slot-app{height:280px}
    .tool-drawer{right:4%;bottom:64px;width:92%;max-height:70vh}.search-layer{inset:22px 0 0;background:var(--deep);top:22px}.search-card{width:100%;height:calc(100vh - 22px);border-radius:0;background:var(--deep);color:#F7F8FD;border:0;padding:24px 16px}.search-card label,.search-empty{color:#D7DCF1}.search-top strong{color:#F7F8FD}.search-card input{background:#F7F8FD}.search-presets a{background:#2C2950;color:#F7F8FD;border-color:rgba(138,164,224,.35)}
    .mobile-bottom{position:fixed;z-index:70;left:0;right:0;bottom:0;height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:var(--surface);border-top:1px solid var(--border);display:grid;grid-template-columns:repeat(4,1fr)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;min-height:48px;font-size:13px;color:var(--muted)}.mobile-bottom a.active{background:var(--purple);color:#F7F8FD}
    .site-footer{padding-bottom:98px}.footer-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:420px){.address-row{gap:8px}.address-row span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.app-open-link,.drawer-button{font-size:13px;padding:0 10px}.product-visual{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}.reading-sheet{padding:20px}.hero-window,.long-copy,.tag-panel,.compare-card,.product-card,.brand-statement{padding:16px}}