:root{
  --bg:#EEF0F8;--deep-bg:#E0E4F2;--content:#F7F8FD;--soft:#EBEEF8;
  --title:#1A1840;--text:#2C2A48;--muted:#5A5680;--assist:#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;background:var(--bg)}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",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%;display:block;object-fit:contain;object-position:center}
:focus-visible{outline:3px solid rgba(91,75,219,.35);outline-offset:3px}
.address-bar{position:fixed;z-index:120;top:0;left:0;right:0;height:22px;background:var(--deep);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;max-width:75%}.search-open{height:22px;border:0;background:transparent;color:#F7F8FD;padding:0 8px}
.window-bar{position:fixed;z-index:119;top:22px;left:0;right:0;height:54px;background:#E8E7F8;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;display:flex;align-items:center;min-height:44px;color:var(--title);font-weight:700}.window-logo img{height:24px;width:auto}.window-logo span{font-size:16px}.app-link{justify-self:center;min-height:44px;display:flex;align-items:center;padding:0 16px;border-radius:10px;color:var(--purple);font-weight:700}.drawer-open{justify-self:end;min-height:44px;border:1px solid var(--border-strong);background:var(--content);color:var(--deep);border-radius:10px;padding:0 14px}
.pill-nav{position:fixed;z-index:118;top:76px;left:0;right:0;min-height:42px;background:var(--content);border-bottom:1px solid var(--border)}.pill-nav-inner{max-width:1000px;margin:0 auto;padding:6px 16px;display:flex;justify-content:center;gap:8px;flex-wrap:wrap}.pill-nav a{font-size:13px;min-height:30px;padding:4px 14px;display:flex;align-items:center;border:1px solid var(--border);border-radius:999px;color:var(--deep);background:#fff}.pill-nav a.is-current{background:var(--purple);border-color:var(--purple);color:#F7F8FD}
.site-main{max-width:1000px;margin:0 auto;padding:146px 16px 72px;min-height:70vh}
.overlay{position:fixed;z-index:180;inset:0;background:rgba(28,26,58,.38);opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.overlay.is-visible{opacity:1;visibility:visible;pointer-events:auto}.ui-locked{overflow:hidden}
.tool-drawer{position:fixed;z-index:200;right:24px;bottom:24px;width:360px;max-height:70vh;overflow:auto;background:var(--content);border:1px solid var(--border-strong);border-radius:14px;box-shadow:var(--shadow);padding:16px;opacity:0;visibility:hidden;pointer-events:none;transform:translateY(18px);transition:.2s}.tool-drawer.is-open{opacity:1;visibility:visible;pointer-events:auto;transform:none}.drawer-head{display:flex;justify-content:space-between;gap:12px;align-items:flex-start;padding-bottom:12px;border-bottom:1px solid var(--border)}.drawer-brand{display:flex;gap:10px;align-items:center}.drawer-brand img{height:24px;width:auto}.drawer-brand strong{display:block;color:var(--title)}.drawer-brand span{display:block;font-size:12px;color:var(--muted)}.plain-close{min-height:40px;padding:0 12px;border:1px solid var(--border);background:#fff;color:var(--deep);border-radius:10px}.drawer-groups{display:grid;gap:16px;margin-top:14px}.drawer-groups h2{font-size:13px;color:var(--purple);margin:0 0 6px}.drawer-groups a{display:grid;grid-template-columns:92px 1fr;gap:8px;padding:8px 6px;border-radius:8px}.drawer-groups a:hover{background:var(--soft)}.drawer-groups b{color:var(--title);font-size:14px}.drawer-groups span{font-size:12px;color:var(--muted)}
.search-layer{position:fixed;z-index:195;top:76px;left:0;right:0;padding:14px 16px;background:#E8E7F8;border-bottom:1px solid var(--border-strong);opacity:0;visibility:hidden;pointer-events:none;transform:translateY(-8px);transition:.2s}.search-layer.is-open{opacity:1;visibility:visible;pointer-events:auto;transform:none}.search-shell{max-width:760px;margin:0 auto}.search-topline{display:flex;align-items:center;justify-content:space-between;gap:16px;color:var(--title)}.search-label{display:block;margin-top:8px;font-size:13px;color:var(--muted)}#siteSearchInput{width:100%;height:44px;border:1px solid var(--border-strong);border-radius:12px;background:#fff;color:var(--deep);padding:0 14px;margin-top:6px}.search-presets{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}.search-presets a{min-height:40px;display:flex;align-items:center;padding:0 14px;border-radius:999px;background:#fff;border:1px solid var(--border);color:var(--deep)}
.hero-window,.long-panel,.stairs-wrap,.tag-panel,.compare-panel,.path-panel,.center-panel,.product-panel,.policy-doc,.help-block,.contact-panel,.about-panel,.reading-panel,.tool-board,.memo-board,.install-board{margin-bottom:28px}
h1{font-size:24px;line-height:1.3;color:var(--title);margin:14px 0 10px}h2{font-size:20px;line-height:1.35;color:var(--title);margin:0 0 12px}h3{font-size:16px;line-height:1.45;color:var(--title);margin:0 0 8px}p{margin:0 0 12px}.eyebrow{font-size:12px;letter-spacing:.06em;color:var(--purple);font-weight:700;text-transform:uppercase}.lead{font-size:16px;color:var(--muted);max-width:780px}.section-head{margin-bottom:14px}.section-head p{color:var(--muted);max-width:760px}.muted{color:var(--muted)}
.media-slot{background:var(--content);border:1px solid var(--border);border-radius:14px;display:flex;align-items:center;justify-content:center;overflow:hidden}.media-slot.banner{height:168px}.media-slot.wide{height:176px}.media-slot.app-portrait{height:320px;max-width:360px;margin:0 auto}.media-slot.standard{height:180px}.media-slot img{width:100%;height:100%;padding:12px}.slot-empty{width:100%;height:100%;display:flex;align-items:center;justify-content:center;color:var(--assist);font-size:13px;background:linear-gradient(135deg,#F7F8FD,#E9EBF7)}
.btn-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}.btn{min-height:42px;padding:0 18px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;white-space:nowrap}.btn-primary{background:linear-gradient(135deg,#8AA4E0 0%,#5B4BDB 55%,#3A6BD4 100%);color:#F7F8FD;border:1px solid transparent}.btn-secondary{background:var(--content);border:1px solid var(--border-strong);color:var(--deep)}.btn:hover{transform:translateY(-1px)}
.center-actions{justify-content:center}
.hero-window{background:#E7E5F6;border:1px solid var(--border-strong);border-radius:14px;padding:16px;box-shadow:var(--shadow)}.hero-window .hero-copy{padding:6px 2px 0}.long-panel{background:var(--content);border:1px solid var(--border);border-radius:14px;padding:18px}.long-panel .media-slot{margin-bottom:16px}.long-panel p{max-width:900px}
.stairs{display:grid;gap:12px}.step-card{background:var(--content);border:1px solid var(--border);border-radius:12px;padding:16px;box-shadow:0 8px 20px rgba(28,26,58,.05);max-width:82%}.step-card:nth-child(2){margin-left:24px}.step-card:nth-child(3){margin-left:48px}.step-card .media-slot{margin-bottom:12px}
.tag-panel{background:var(--content);border-radius:14px;border:1px solid var(--border);padding:18px}.tag-cloud{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0}.tag-cloud span{padding:8px 14px;border-radius:999px;background:#E6E9F8;border:1px solid var(--border);color:var(--deep);font-weight:700}.tag-body{display:grid;grid-template-columns:1.1fr .9fr;gap:16px;align-items:start}
.compare-panel{display:grid;grid-template-columns:1fr 1fr;gap:16px}.compare-card{background:var(--content);border:1px solid var(--border);border-radius:14px;padding:18px}.compare-card .media-slot{margin-bottom:12px}
.path-panel{background:#E6EAF6;border:1px solid var(--border-strong);border-radius:14px;padding:18px}.path-flow{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:14px}.path-flow a,.path-flow span{min-height:40px;display:inline-flex;align-items:center;padding:0 14px;border-radius:10px;background:var(--content);border:1px solid var(--border);color:var(--deep);font-weight:700}.path-flow i{font-style:normal;color:var(--purple)}
.center-panel{text-align:center}.center-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;max-width:760px;margin:0 auto}.center-card{background:var(--content);border:1px solid var(--border);border-radius:14px;padding:18px;text-align:left}.center-card .media-slot{margin-bottom:12px}
.product-panel{max-width:760px;margin-left:auto;margin-right:auto;background:var(--content);border:1px solid var(--border-strong);border-radius:14px;padding:20px;text-align:center;box-shadow:var(--shadow)}.product-icons{display:flex;justify-content:center;gap:10px;align-items:center;margin-bottom:12px}.product-icons img{width:48px;height:48px}.product-panel .media-slot{margin:14px auto}.product-panel p{text-align:left}
.info-strip{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:18px 0}.info-item{background:var(--soft);border:1px solid var(--border);border-radius:12px;padding:15px}.faq-mini{display:grid;gap:12px}.faq-mini details{background:var(--content);border:1px solid var(--border);border-radius:12px;padding:12px 14px}.faq-mini summary{cursor:pointer;color:var(--title);font-weight:700}.faq-mini p{margin-top:10px;color:var(--muted)}
.window-outline{border:1px solid var(--border-strong);background:var(--content);border-radius:14px;overflow:hidden}.window-chrome{height:34px;background:#E5E7F4;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:6px;padding:0 10px}.window-chrome i{width:8px;height:8px;border-radius:50%;background:var(--mist)}.window-body{padding:18px}.window-body .media-slot{margin:0 0 14px}
.stair-page .step-card{max-width:88%}.stair-page .step-card:nth-child(2){margin-left:24px}.stair-page .step-card:nth-child(3){margin-left:48px}.stair-page .step-card:nth-child(4){margin-left:72px}
.reading-panel{background:var(--content);border:1px solid var(--border);border-radius:14px;padding:22px;max-width:820px;margin-left:auto;margin-right:auto}.reading-controls{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}.reading-controls span{padding:8px 12px;background:var(--soft);border:1px solid var(--border);border-radius:10px;color:var(--deep)}.reading-text{padding:18px;background:#FAFAFE;border-left:4px solid var(--lilac);border-radius:0 12px 12px 0}
.tool-board{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.tool-card{background:var(--content);border:1px solid var(--border);border-radius:14px;padding:16px}.tool-card .icon-dot{width:34px;height:34px;border-radius:10px;background:var(--deep);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;margin-bottom:10px}.tool-image{grid-column:1/-1}
.split-layout{display:grid;grid-template-columns:1fr 1fr;gap:16px}.split-side{background:var(--content);border:1px solid var(--border);border-radius:14px;padding:18px}.split-side.is-primary{border-color:var(--border-strong)}.split-divider{grid-column:1/-1;background:var(--deep);color:#F7F8FD;border-radius:12px;padding:16px}
.route-stack{display:grid;gap:12px}.route-item{display:grid;grid-template-columns:120px 1fr;gap:14px;align-items:start;background:var(--content);border:1px solid var(--border);border-radius:12px;padding:14px}.route-key{background:var(--purple);color:#fff;border-radius:10px;padding:10px 12px;text-align:center;font-weight:700}
.memo-board{display:grid;grid-template-columns:1fr 1fr;gap:16px}.memo-card{background:#F7F8FD;border:1px solid var(--border);border-radius:14px;padding:16px}.memo-card ul{padding-left:20px;margin:0}.memo-card li{margin-bottom:8px}.memo-callout{grid-column:1/-1;background:var(--deep);color:#F7F8FD;border-radius:14px;padding:16px}
.policy-doc{background:var(--content);border:1px solid var(--border);border-radius:14px;padding:20px}.policy-section{padding:16px 0;border-bottom:1px solid var(--border)}.policy-section:last-child{border-bottom:0}.policy-section h2{font-size:18px}.policy-section p:last-child{margin-bottom:0}
.install-board{display:grid;grid-template-columns:1fr 1fr;gap:14px}.install-step{background:var(--content);border:1px solid var(--border);border-radius:14px;padding:18px}.install-step b{display:inline-flex;align-items:center;justify-content:center;min-width:34px;height:34px;border-radius:10px;background:var(--blue);color:#fff;margin-bottom:10px}.install-wide{grid-column:1/-1;background:#E7E5F6;border:1px solid var(--border-strong);border-radius:14px;padding:18px}
.help-block{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.help-card{background:var(--content);border:1px solid var(--border);border-radius:14px;padding:18px}.help-card a{display:inline-flex;min-height:40px;align-items:center;color:var(--purple);font-weight:700}
.faq-list{display:grid;gap:12px}.faq-item{background:var(--content);border:1px solid var(--border);border-radius:14px;padding:16px}.faq-item h2{font-size:17px}.faq-item p{margin-bottom:0;color:var(--muted)}
.contact-panel{display:grid;grid-template-columns:1fr 1fr;gap:14px}.contact-card{background:var(--content);border:1px solid var(--border);border-radius:14px;padding:18px}.contact-note{grid-column:1/-1;background:var(--deep);color:#F7F8FD;border-radius:14px;padding:18px}
.about-panel{display:grid;gap:16px}.about-hero{background:#E7E5F6;border:1px solid var(--border-strong);border-radius:14px;padding:18px}.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.about-card{background:var(--content);border:1px solid var(--border);border-radius:14px;padding:18px}
.site-footer{background:var(--deep);color:#EEF0F8;border-top:1px solid var(--mist);font-size:13px}.footer-inner{max-width:1000px;margin:0 auto;padding:28px 16px 82px}.footer-brand{display:flex;gap:12px;align-items:center;margin-bottom:18px}.footer-brand img{height:24px;width:auto}.footer-brand strong{display:block;font-size:15px}.footer-brand span{display:block;color:#C8CBE8}.footer-links{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px;border-top:1px solid rgba(138,164,224,.25);border-bottom:1px solid rgba(138,164,224,.25);padding:18px 0}.footer-links h2{font-size:13px;color:#DADCF0;margin-bottom:8px}.footer-links a{display:block;color:#EEF0F8;margin:6px 0}.footer-note{margin-top:16px;color:#D1D4EA}.copyright{color:#B9BDD9;margin-bottom:0}.mobile-bottom{display:none}
@media (max-width:720px){
 .address-bar{padding:0 12px}.window-bar{padding:0 8px;grid-template-columns:1fr auto 1fr}.window-logo{min-width:0}.window-logo span{font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:132px}.app-link{padding:0 10px}.drawer-open{padding:0 10px}.pill-nav{display:none}.site-main{padding:96px 16px 78px}.tool-drawer{right:4%;bottom:58px;width:92%;max-height:70vh}.search-layer{top:0;bottom:0;padding:28px 16px;background:var(--deep);color:#F7F8FD}.search-topline{color:#F7F8FD}.search-label{color:#D6D7EB}.search-presets a{background:#F7F8FD;color:var(--deep)}
 .tag-body,.compare-panel,.center-cards,.info-strip,.tool-board,.split-layout,.memo-board,.install-board,.help-block,.contact-panel,.about-grid{grid-template-columns:1fr}.step-card,.stair-page .step-card{max-width:100%;margin-left:0!important}.route-item{grid-template-columns:1fr}.route-key{text-align:left}.tool-image,.memo-callout,.install-wide,.contact-note,.split-divider{grid-column:auto}.footer-links{grid-template-columns:1fr 1fr}.footer-inner{padding-bottom:76px}.mobile-bottom{position:fixed;z-index:150;left:0;right:0;bottom:0;display:grid;grid-template-columns:repeat(4,1fr);height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:var(--content);border-top:1px solid var(--border-strong)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;font-size:13px;color:var(--deep)}.mobile-bottom a.is-current{background:var(--purple);color:#F7F8FD}.drawer-groups a{grid-template-columns:82px 1fr}
}