:root{
    --bg:#EEF0F8;
    --bg-deep:#E0E4F2;
    --card:#F7F8FD;
    --sub:#EBEEF8;
    --title:#1A1840;
    --text:#2C2A48;
    --muted:#5A5680;
    --soft:#7A76A0;
    --purple:#5B4BDB;
    --blue:#3A6BD4;
    --dark:#1C1A3A;
    --mist:#8AA4E0;
    --lilac:#8A6AD4;
    --warm:#F7F8FD;
    --border:rgba(58,107,212,.18);
    --border-strong:rgba(91,75,219,.42);
    --shadow:0 12px 28px rgba(28,26,58,.08);
    --radius:12px;
    --top-h:118px;
}
*{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}
button,input{font:inherit}
button{cursor:pointer}
img{display:block;max-width:100%;height:auto}
.shell{width:min(1000px,calc(100% - 32px));margin:0 auto}
.site-top{position:fixed;inset:0 0 auto 0;z-index:100;background:var(--warm);box-shadow:0 1px 0 var(--border)}
.address-strip{height:22px;background:var(--dark);color:var(--warm);font-size:12px}
.address-strip-inner{height:22px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.text-button{border:0;background:transparent;color:var(--warm);padding:0 2px;min-height:22px}
.window-bar{height:54px;background:var(--bg-deep);border-bottom:1px solid var(--border)}
.window-bar-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,.drawer-logo,.footer-logo{height:24px;width:auto;max-width:180px;object-fit:contain;object-position:center}
.brand-fallback{font-size:16px;font-weight:800;color:var(--title);white-space:nowrap}
.app-shortcut{justify-self:center;min-height:44px;padding:0 18px;border:1px solid var(--border-strong);border-radius:999px;display:inline-flex;align-items:center;justify-content:center;color:var(--dark);font-size:14px;background:var(--warm)}
.drawer-open{justify-self:end;min-width:72px;min-height:44px;border:0;border-radius:999px;background:linear-gradient(135deg,#8AA4E0 0%,#5B4BDB 55%,#3A6BD4 100%);color:var(--warm);font-size:14px;padding:0 16px}
.section-tabs{height:42px;background:var(--warm);border-bottom:1px solid var(--border)}
.section-tabs-inner{height:42px;display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap;overflow:visible}
.tab-link{min-height:30px;padding:4px 14px;border:1px solid var(--border);border-radius:999px;color:var(--dark);font-size:13px;display:inline-flex;align-items:center;justify-content:center;background:var(--card)}
.tab-link.is-current{background:var(--purple);border-color:var(--purple);color:var(--warm)}
.site-main{padding-top:calc(var(--top-h) + 28px);min-height:70vh}
.site-main:focus{outline:none}
.page-section{padding:32px 0}
.page-section.tight{padding:22px 0}
.page-section.deep{background:var(--bg-deep)}
.page-section.subtle{background:var(--sub)}
.kicker{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--purple);font-weight:800;letter-spacing:.04em;margin-bottom:8px}
h1,h2,h3{margin:0;color:var(--title);line-height:1.3}
h1{font-size:24px;margin-bottom:14px}
h2{font-size:20px;margin-bottom:14px}
h3{font-size:16px;margin-bottom:8px}
p{margin:0 0 14px}
.lead{font-size:15px;color:var(--muted);max-width:760px}
.page-intro{padding:28px 0 18px}
.page-intro .lead{max-width:850px}
.btn-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.btn-row.centered{justify-content:center}
.btn{min-height:42px;padding:0 18px;border-radius:11px;font-size:14px;display:inline-flex;align-items:center;justify-content:center;border:1px solid transparent;white-space:nowrap}
.btn.primary{background:linear-gradient(135deg,#8AA4E0 0%,#5B4BDB 55%,#3A6BD4 100%);color:var(--warm)}
.btn.secondary{background:var(--warm);border-color: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,.25);outline-offset:2px}
.media-slot{background:var(--warm);border:1px solid var(--border);border-radius:14px;display:flex;align-items:center;justify-content:center;overflow:hidden;padding:12px}
.media-slot img{width:100%;height:100%;object-fit:contain;object-position:center}
.media-slot.banner{height:168px}
.media-slot.wide{height:176px}
.media-slot.medium{height:210px}
.media-slot.app-shot{height:320px;max-width:340px;margin:0 auto}
.media-slot.empty::after{content:"";display:block;width:48px;height:48px;border-radius:12px;border:1px dashed var(--border-strong)}
.window-demo{background:var(--card);border:1px solid var(--border-strong);border-radius:14px;box-shadow:var(--shadow);overflow:hidden}
.window-demo-top{height:28px;background:var(--bg-deep);border-bottom:1px solid var(--border);display:flex;align-items:center;gap:6px;padding:0 12px}
.window-dot{width:8px;height:8px;border-radius:50%;background:var(--mist)}
.window-demo-body{padding:18px}
.hero-copy{padding-top:18px}
.long-copy{max-width:820px;margin:0 auto}
.copy-card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:20px;box-shadow:var(--shadow)}
.stack{display:grid;gap:14px}
.stair-wrap{max-width:820px;margin:0 auto;display:grid;gap:14px}
.stair-card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:20px;box-shadow:var(--shadow)}
.stair-card.shift{margin-left:24px}
.stair-card .media-slot{margin-bottom:16px}
.tag-wrap{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0 18px}
.tag-chip{background:var(--bg-deep);border:1px solid var(--border-strong);color:var(--dark);border-radius:999px;padding:8px 14px;min-height:40px;display:inline-flex;align-items:center}
.split-compare{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.compare-card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:18px;min-width:0}
.compare-card .media-slot{margin-bottom:14px}
.path-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:18px}
.path-step{background:var(--card);border:1px solid var(--border-strong);border-radius:14px;padding:18px;position:relative}
.path-step strong{display:block;color:var(--title);margin-bottom:6px}
.center-cards{max-width:720px;margin:0 auto;display:grid;grid-template-columns:1fr 1fr;gap:16px}
.center-card{text-align:center;background:var(--card);border:1px solid var(--border);border-radius:14px;padding:20px;box-shadow:var(--shadow)}
.product-card{max-width:760px;margin:0 auto;background:var(--card);border:1px solid var(--border-strong);border-radius:14px;padding:22px;box-shadow:var(--shadow);text-align:center}
.product-icon{width:48px;height:48px;object-fit:contain;margin:0 auto 12px}
.product-card .lead{margin:0 auto}
.notice-list,.tool-list,.memo-list{display:grid;gap:12px}
.notice-item,.tool-item,.memo-item{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px 18px}
.tool-item{display:grid;grid-template-columns:150px 1fr;gap:16px;align-items:start}
.tool-item strong{color:var(--title)}
.reading-sheet{max-width:760px;margin:0 auto;background:var(--warm);border:1px solid var(--border);border-radius:14px;padding:28px;box-shadow:var(--shadow)}
.reading-controls{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}
.reading-controls span{border:1px solid var(--border);background:var(--sub);color:var(--dark);border-radius:999px;padding:6px 12px}
.clause-list{display:grid;gap:14px}
.clause{background:var(--card);border:1px solid var(--border);border-left:4px solid var(--purple);border-radius:12px;padding:18px}
.install-flow{display:grid;gap:14px;counter-reset:install}
.install-step{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:18px;display:grid;grid-template-columns:44px 1fr;gap:14px}
.install-step::before{counter-increment:install;content:counter(install);width:44px;height:44px;border-radius:50%;background:var(--purple);color:var(--warm);display:flex;align-items:center;justify-content:center;font-weight:800}
.topic-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.topic-card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:18px}
.faq-list{display:grid;gap:12px}
.faq-list details{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:0 18px}
.faq-list summary{cursor:pointer;list-style:none;padding:16px 28px 16px 0;color:var(--title);font-weight:800;position:relative}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:"+";position:absolute;right:0;top:16px;color:var(--purple);font-size:20px;line-height:1}
.faq-list details[open] summary::after{content:"−"}
.faq-list details p{padding-bottom:16px;color:var(--text)}
.contact-lanes{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.contact-lane{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:18px}
.brand-statement{background:var(--dark);color:var(--warm);border-radius:14px;padding:24px;box-shadow:var(--shadow)}
.brand-statement h2,.brand-statement h3{color:var(--warm)}
.brand-statement p{color:#EEF0F8}
.fine-note{font-size:13px;color:var(--soft)}
.top-gap{margin-top:16px}
.site-footer{margin-top:36px;background:var(--dark);color:var(--warm);border-top:1px solid rgba(138,164,224,.35);padding:28px 0 calc(26px + env(safe-area-inset-bottom))}
.footer-grid{display:grid;grid-template-columns:1.6fr repeat(4,1fr);gap:20px}
.footer-brand-row{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.footer-brand-row strong,.footer-brand-row span{display:block;color:var(--warm)}
.footer-brand-row span{font-size:12px;color:#C7CCE6}
.footer-brand p{font-size:13px;color:#D9DCEF;margin:0}
.footer-links{display:flex;flex-direction:column;gap:7px;font-size:13px}
.footer-links strong{color:#C7CCE6;margin-bottom:2px}
.footer-links a{color:var(--warm)}
.footer-bottom{margin-top:24px;padding-top:18px;border-top:1px solid rgba(138,164,224,.26);font-size:13px;color:#C7CCE6}
.site-overlay{position:fixed;inset:0;z-index:180;background:rgba(28,26,58,.42);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .18s ease,visibility .18s ease}
.site-overlay.is-visible{opacity:1;visibility:visible;pointer-events:auto}
.tool-drawer{position:fixed;right:20px;bottom:20px;z-index:220;width:min(360px,calc(100% - 32px));max-height:70vh;background:var(--warm);border:1px solid var(--border-strong);border-radius:16px;box-shadow:0 24px 70px rgba(28,26,58,.22);visibility:hidden;pointer-events:none;opacity:0;transform:translateY(18px);transition:.18s ease;overflow:hidden}
.tool-drawer[aria-hidden="false"]{visibility:visible;pointer-events:auto;opacity:1;transform:none}
.drawer-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 16px;background:var(--bg-deep);border-bottom:1px solid var(--border)}
.drawer-brand{display:flex;align-items:center;gap:10px}
.drawer-close,.search-close{min-height:40px;border:1px solid var(--border-strong);border-radius:10px;background:var(--warm);color:var(--dark);padding:0 14px}
.drawer-scroll{overflow:auto;max-height:calc(70vh - 70px);padding:12px 14px 16px}
.drawer-group{margin-bottom:16px}
.drawer-group:last-child{margin-bottom:0}
.drawer-group h2{font-size:14px;margin:0 0 8px;color:var(--muted)}
.drawer-group a{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;padding:11px 10px;border-radius:10px}
.drawer-group a:hover{background:var(--sub)}
.drawer-group span{font-weight:800;color:var(--title)}
.drawer-group small{font-size:12px;color:var(--soft);text-align:right;max-width:190px}
.search-panel{position:fixed;left:0;right:0;top:76px;z-index:210;visibility:hidden;pointer-events:none;opacity:0;transform:translateY(-10px);transition:.18s ease}
.search-panel[aria-hidden="false"]{visibility:visible;pointer-events:auto;opacity:1;transform:none}
.search-card{width:min(760px,calc(100% - 32px));margin:0 auto;background:var(--bg-deep);border:1px solid var(--border-strong);border-radius:0 0 16px 16px;box-shadow:var(--shadow);padding:18px}
.search-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:14px}
.search-head strong{font-size:18px;color:var(--title)}
.search-head p{margin:3px 0 0;color:var(--muted)}
.search-field span{display:block;font-size:13px;color:var(--muted);margin-bottom:6px}
.search-field input{width:100%;height:46px;border:1px solid var(--border-strong);border-radius:11px;padding:0 14px;background:var(--warm);color:var(--dark)}
.search-presets{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.search-presets a{min-height:40px;display:inline-flex;align-items:center;padding:0 14px;border:1px solid var(--border);border-radius:999px;background:var(--warm);color:var(--dark)}
.search-empty{margin:12px 0 0;color:var(--muted);font-size:13px}
body.drawer-active,body.search-active{overflow:hidden}
.mobile-bottom{display:none}
.home-window .window-demo{max-width:900px;margin:0 auto}
.home-window .hero-copy{max-width:820px;margin:0 auto}
.home-long .media-slot{margin-bottom:18px}
.app-copy{max-width:620px;margin:14px auto 0}
.info-columns{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.callout{background:var(--bg-deep);border:1px solid var(--border-strong);border-radius:14px;padding:18px}
.page-image{margin:18px 0}
@media (max-width:820px){
    :root{--top-h:76px}
    .section-tabs{display:none}
    .site-main{padding-top:calc(var(--top-h) + 24px)}
    .footer-grid{grid-template-columns:1.5fr 1fr 1fr}
    .footer-brand{grid-column:1/-1}
    .split-compare,.center-cards,.topic-grid,.contact-lanes,.info-columns{grid-template-columns:1fr}
    .path-strip{grid-template-columns:1fr}
    .tool-item{grid-template-columns:1fr;gap:6px}
}
@media (max-width:640px){
    body{padding-bottom:calc(48px + env(safe-area-inset-bottom))}
    .shell{width:calc(100% - 32px)}
    .address-strip-inner{font-size:11px}
    .window-bar-inner{grid-template-columns:minmax(0,1fr) auto auto;gap:6px}
    .brand-link{min-width:0;overflow:hidden}
    .brand-logo{height:24px;max-width:126px}
    .brand-fallback{font-size:14px;overflow:hidden;text-overflow:ellipsis}
    .app-shortcut,.drawer-open{padding:0 10px;min-width:auto;font-size:13px}
    .page-section{padding:24px 0}
    .page-intro{padding-top:18px}
    .stair-card.shift{margin-left:0}
    .media-slot.app-shot{height:290px}
    .footer-grid{grid-template-columns:1fr 1fr;gap:18px}
    .footer-brand{grid-column:1/-1}
    .site-footer{padding-bottom:calc(74px + env(safe-area-inset-bottom))}
    .tool-drawer{right:4%;left:4%;bottom:64px;width:92%;max-height:70vh}
    .drawer-scroll{max-height:calc(70vh - 70px)}
    .drawer-group a{display:block}
    .drawer-group small{display:block;text-align:left;max-width:none;margin-top:2px}
    .search-panel{top:0;bottom:0;background:var(--dark);padding:16px;overflow:auto}
    .search-card{width:100%;min-height:100%;margin:0;background:var(--dark);color:var(--warm);border:0;border-radius:0;box-shadow:none;padding:72px 0 28px}
    .search-head strong{color:var(--warm)}
    .search-head p,.search-field span{color:#C7CCE6}
    .search-close{background:transparent;border-color:rgba(247,248,253,.38);color:var(--warm)}
    .search-field input{background:var(--warm);color:var(--dark)}
    .search-presets a{background:transparent;border-color:rgba(247,248,253,.24);color:var(--warm)}
    .search-empty{color:#C7CCE6}
    .mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:150;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(--warm);border-top:1px solid var(--border);box-shadow:0 -8px 24px rgba(28,26,58,.08)}
    .mobile-bottom a{display:flex;align-items:center;justify-content:center;min-height:48px;font-size:13px;color:var(--dark)}
    .mobile-bottom a.is-current{background:var(--purple);color:var(--warm)}
    .drawer-active .mobile-bottom,.search-active .mobile-bottom{z-index:120}
    .footer-bottom{padding-bottom:0}
}
@media (prefers-reduced-motion:reduce){
    *{scroll-behavior:auto!important;transition:none!important}
}