: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);--border-strong:rgba(91,75,219,.42);--shadow:0 12px 28px rgba(28,26,58,.08);
  --radius:12px;--max:1000px;--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","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{color:inherit}
img{display:block;max-width:100%}
.site-shell{position:fixed;inset:0 0 auto;z-index:900;box-shadow:0 4px 18px rgba(28,26,58,.05)}
.address-bar{height:22px;background:var(--deep);color:#F7F8FD;font-size:12px}
.address-inner,.window-inner,.tab-inner,.main-content,.footer-inner{width:min(var(--max),calc(100% - 32px));margin:0 auto}
.address-inner{height:22px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.address-brand{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.text-control{height:22px;padding:0 4px;border:0;background:transparent;color:#F7F8FD;cursor:pointer}
.window-bar{height:54px;background:#E7E4F6;border-bottom:1px solid var(--border-strong)}
.window-inner{height:54px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px}
.brand-link{justify-self:start;min-height:44px;display:flex;align-items:center;max-width:180px}
.brand-logo{height:24px;width:auto;object-fit:contain;object-position:center}
.brand-fallback{font-size:16px;font-weight:800;color:var(--title);white-space:nowrap}
.app-entry,.drawer-button{min-height:44px;display:inline-flex;align-items:center;justify-content:center;border-radius:11px;padding:0 16px;font-size:14px;font-weight:700}
.app-entry{justify-self:center;background:linear-gradient(135deg,#8AA4E0 0%,#5B4BDB 55%,#3A6BD4 100%);color:#F7F8FD}
.drawer-button{justify-self:end;border:1px solid var(--border-strong);background:var(--surface);color:var(--deep);cursor:pointer}
.tab-bar{height:42px;background:var(--surface);border-bottom:1px solid var(--border)}
.tab-inner{height:42px;display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap;overflow:hidden}
.tab-link{min-height:32px;padding:5px 15px;border-radius:999px;color:var(--deep);font-size:13px;display:inline-flex;align-items:center}
.tab-link:hover,.tab-link:focus-visible{background:#E5E8F8;outline:none}
.tab-link.is-current{background:var(--purple);color:#F7F8FD}
.main-content{padding-top:calc(var(--top-h) + 34px);padding-bottom:72px;min-height:70vh}
.main-content h1{font-size:24px;line-height:1.3;color:var(--title);margin:0 0 14px}
.main-content h2{font-size:20px;line-height:1.35;color:var(--title);margin:0 0 12px}
.main-content h3{font-size:16px;line-height:1.45;color:var(--title);margin:0 0 8px}
.main-content p{margin:0 0 12px}
.eyebrow{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--purple);font-weight:800;margin-bottom:8px!important}
.lead{font-size:16px;color:var(--muted);max-width:760px}
.page-hero{padding:32px 0 26px;border-bottom:1px solid var(--border);margin-bottom:28px}
.page-hero.compact{padding-top:18px}
.action-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.btn-primary,.btn-secondary{height:42px;min-width:112px;padding:0 18px;border-radius:11px;display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:800;white-space:nowrap}
.btn-primary{background:linear-gradient(135deg,#8AA4E0 0%,#5B4BDB 55%,#3A6BD4 100%);color:#F7F8FD}
.btn-secondary{border:1px solid var(--border-strong);background:var(--surface);color:var(--deep)}
.btn-primary:hover,.btn-secondary:hover{transform:translateY(-1px);box-shadow:var(--shadow)}
.btn-primary:focus-visible,.btn-secondary:focus-visible,.drawer-button:focus-visible,.app-entry:focus-visible,.text-control:focus-visible,a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid rgba(58,107,212,.28);outline-offset:2px}
.section{margin:0 0 40px}
.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}
.panel.soft{background:var(--surface-2)}
.panel.deep{background:var(--deep);color:#F7F8FD;border-color:rgba(138,164,224,.32)}
.panel.deep h2,.panel.deep h3{color:#F7F8FD}
.note-box{padding:16px 18px;border-left:4px solid var(--purple);background:#E9E7F8;border-radius:0 12px 12px 0;color:var(--deep)}
.media-slot{margin:0;background:#E8E6F4;border:1px solid var(--border);border-radius:12px;display:flex;align-items:center;justify-content:center;overflow:hidden;min-height:150px}
.media-slot img{width:100%;height:100%;object-fit:contain;object-position:center}
.media-empty{display:block;width:100%;height:100%;min-height:inherit;background:linear-gradient(135deg,rgba(138,164,224,.08),rgba(91,75,219,.08))}
.media-banner{height:168px}
.media-wide{height:176px}
.media-app{height:min(320px,55vw);min-height:220px}
.media-section{height:220px}
.media-icon{height:72px;width:72px;min-height:72px;border-radius:18px;margin:0 auto 12px}
.media-icon img{width:48px;height:48px}
.window-frame{border:1px solid var(--border-strong);background:var(--surface);border-radius:14px;box-shadow:var(--shadow);overflow:hidden;margin-bottom:28px}
.window-frame-top{height:30px;background:var(--deep);display:flex;align-items:center;gap:6px;padding:0 12px}
.window-dot{width:7px;height:7px;border-radius:50%;background:#F7F8FD;opacity:.65}
.window-frame-body{padding:16px}
.home-intro{display:grid;grid-template-columns:1fr;gap:18px}
.single-story{display:grid;gap:18px}
.stair-stack{display:grid;gap:12px;max-width:760px}
.stair-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:18px;box-shadow:var(--shadow)}
.stair-card:nth-child(2){margin-left:24px}.stair-card:nth-child(3){margin-left:48px}
.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:#E6E8F6;border:1px solid var(--border);color:var(--deep);font-size:13px}
.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.path-rail{display:grid;grid-template-columns:auto 1fr;gap:12px 18px;align-items:start}
.path-step{width:44px;height:44px;border-radius:14px;background:var(--purple);color:#F7F8FD;display:flex;align-items:center;justify-content:center;font-weight:800}
.path-copy{padding:8px 0 18px;border-bottom:1px solid var(--border)}
.center-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;max-width:760px;margin:0 auto}
.center-card{text-align:center;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:22px;box-shadow:var(--shadow)}
.product-card{max-width:720px;margin:0 auto;background:var(--surface);border:1px solid var(--border-strong);border-radius:14px;padding:24px;box-shadow:var(--shadow);text-align:center}
.product-card .action-row{justify-content:center}
.product-meta{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin:14px 0}.product-meta span{font-size:12px;padding:6px 10px;background:#E9EAF6;border-radius:999px}
.faq-mini{display:grid;gap:12px}.faq-mini details{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:14px 16px}.faq-mini summary{cursor:pointer;font-weight:800;color:var(--title)}
.feature-list,.check-list,.plain-list{margin:0;padding-left:1.25em}.feature-list li,.check-list li,.plain-list li{margin:8px 0}
.tool-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.tool-item{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:18px}.tool-item strong{display:block;color:var(--title);margin-bottom:4px}
.memo-list{counter-reset:memo;display:grid;gap:12px}.memo-item{position:relative;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:18px 18px 18px 58px}.memo-item:before{counter-increment:memo;content:counter(memo);position:absolute;left:16px;top:16px;width:28px;height:28px;border-radius:10px;background:var(--deep);color:#F7F8FD;display:flex;align-items:center;justify-content:center;font-weight:800}
.clause-list{display:grid;gap:14px}.clause{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:20px}.clause h2{padding-bottom:9px;border-bottom:1px solid var(--border)}
.split-lines{display:grid;grid-template-columns:1fr 1fr;gap:18px}.split-pane{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:20px;min-width:0}.split-pane.primary{border-color:var(--border-strong)}
.steps{display:grid;gap:14px;counter-reset:step}.step{display:grid;grid-template-columns:48px 1fr;gap:14px;align-items:start}.step:before{counter-increment:step;content:counter(step);width:44px;height:44px;border-radius:14px;background:var(--blue);color:#F7F8FD;display:flex;align-items:center;justify-content:center;font-weight:800}.step-body{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:17px}
.brand-statement{display:grid;gap:18px}.brand-statement blockquote{margin:0;background:var(--deep);color:#F7F8FD;border-radius:14px;padding:24px;font-size:19px;line-height:1.6}
.contact-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.contact-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:20px}.contact-card a{color:var(--purple);font-weight:800}
.faq-page{display:grid;gap:14px}.faq-page details{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:16px 18px}.faq-page summary{font-weight:800;color:var(--title);cursor:pointer}.faq-page p{margin-top:10px;margin-bottom:0}
.site-footer{background:var(--deep);color:#EEF0F8;border-top:1px solid rgba(138,164,224,.4);padding:34px 0 calc(34px + env(safe-area-inset-bottom));font-size:13px}
.footer-brand{display:flex;align-items:center;gap:12px}.footer-logo{height:24px;width:auto;object-fit:contain}.footer-brand strong{display:block;font-size:16px}.footer-brand span{display:block;color:#C8CEEA;font-size:12px}
.footer-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px;margin:24px 0}.footer-grid h2{font-size:14px;color:#F7F8FD;margin:0 0 8px}.footer-links{display:grid;gap:6px}.footer-links a{color:#D9DDF0}.footer-links a:hover{text-decoration:underline}.footer-note{color:#C9CDE3;max-width:780px}.copyright{margin-bottom:0;color:#AEB5D4}
.page-overlay{position:fixed;inset:0;background:rgba(28,26,58,.42);z-index:960;opacity:0;pointer-events:none;transition:.18s opacity}.page-overlay.is-visible{opacity:1;pointer-events:auto}.page-overlay[hidden]{display:none}
.tool-drawer{position:fixed;right:18px;bottom:18px;width:360px;max-height:70vh;background:var(--surface);border:1px solid var(--border-strong);border-radius:14px;box-shadow:0 20px 50px rgba(28,26,58,.2);z-index:980;visibility:hidden;pointer-events:none;opacity:0;transform:translateY(14px);transition:.18s ease;overflow:hidden}.tool-drawer.is-open{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;border-bottom:1px solid var(--border);background:#E9E7F8}.drawer-brand{display:flex;align-items:center;gap:10px}.drawer-logo{height:24px;width:auto;object-fit:contain}.icon-button{min-height:44px;padding:0 12px;border:1px solid var(--border);background:var(--surface);border-radius:10px;cursor:pointer}.drawer-scroll{max-height:calc(70vh - 74px);overflow:auto;padding:12px 14px 18px}.drawer-group{margin-bottom:14px}.drawer-group h2{font-size:13px;text-transform:none;color:var(--muted);margin:0 0 6px}.drawer-item{display:grid;grid-template-columns:92px 1fr;gap:8px;padding:9px 10px;border-radius:10px;min-height:44px}.drawer-item:hover{background:#E9EAF6}.drawer-item span{font-weight:800;color:var(--title)}.drawer-item small{color:var(--muted);font-size:12px;line-height:1.5}
.search-layer{position:fixed;left:50%;top:86px;transform:translateX(-50%) translateY(-8px);width:min(760px,calc(100% - 32px));z-index:985;visibility:hidden;pointer-events:none;opacity:0;transition:.18s ease}.search-layer.is-open{visibility:visible;pointer-events:auto;opacity:1;transform:translateX(-50%) translateY(0)}.search-card{background:#E9E7F8;border:1px solid var(--border-strong);border-radius:14px;padding:18px;box-shadow:0 20px 50px rgba(28,26,58,.2)}.search-head{display:flex;justify-content:space-between;gap:18px;align-items:start}.search-head strong{font-size:18px;color:var(--title)}.search-head p{margin:2px 0 0;color:var(--muted)}.search-input-wrap{display:block;margin:14px 0}.search-input-wrap input{width:100%;height:46px;border-radius:11px;border:1px solid var(--border-strong);background:var(--surface);padding:0 14px;color:var(--text)}.search-links{display:flex;flex-wrap:wrap;gap:8px}.search-links a{min-height:40px;padding:8px 14px;border-radius:999px;background:var(--surface);border:1px solid var(--border);display:inline-flex;align-items:center}.search-empty{color:var(--muted);margin-top:12px!important}
.mobile-bottom{display:none}.visually-hidden{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}.is-locked{overflow:hidden}
@media (max-width:760px){
  :root{--top-h:76px}
  .address-inner,.window-inner,.main-content,.footer-inner{width:calc(100% - 32px)}
  .tab-bar{display:none}.window-inner{grid-template-columns:minmax(0,1fr) auto auto;gap:8px}.brand-link{max-width:132px}.app-entry,.drawer-button{padding:0 11px;min-width:0}.brand-fallback{font-size:15px}.main-content{padding-top:calc(var(--top-h) + 24px);padding-bottom:84px}.page-hero{padding-top:20px}
  .compare-grid,.center-cards,.split-lines,.contact-grid,.tool-list,.footer-grid{grid-template-columns:1fr}.stair-card:nth-child(2),.stair-card:nth-child(3){margin-left:0}.media-section{height:190px}.media-app{height:300px}
  .tool-drawer{right:4%;bottom:70px;width:92%;max-height:70vh}.drawer-scroll{max-height:calc(70vh - 74px)}
  .search-layer{inset:0;width:100%;transform:none;background:var(--deep);padding:84px 16px 68px}.search-layer.is-open{transform:none}.search-card{background:var(--deep);color:#F7F8FD;border-color:rgba(138,164,224,.32);box-shadow:none}.search-head strong{color:#F7F8FD}.search-head p{color:#D7DDF5}.search-card .icon-button{background:#2A274D;border-color:rgba(138,164,224,.36);color:#F7F8FD}.search-input-wrap input{background:#F7F8FD}.search-links a{background:#2A274D;color:#F7F8FD;border-color:rgba(138,164,224,.28)}.search-empty{color:#D7DDF5}
  .mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:930;height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:var(--surface);border-top:1px solid var(--border-strong);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(--deep)}.mobile-bottom a.is-current{background:var(--purple);color:#F7F8FD}.site-footer{padding-bottom:calc(84px + env(safe-area-inset-bottom))}
  .drawer-item{grid-template-columns:86px 1fr}.window-frame-body{padding:12px}.panel,.product-card{padding:18px}
}
@media (max-width:420px){.app-entry{font-size:13px;padding:0 9px}.drawer-button{font-size:13px;padding:0 9px}.address-brand{max-width:78%}.main-content h1{font-size:23px}.media-banner{height:150px}.media-wide{height:162px}}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

.action-center{justify-content:center}.lead-center{margin-left:auto!important;margin-right:auto!important}