:root{--bg:#EEF0F8;--deep-bg:#E0E4F2;--content:#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);--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","Microsoft YaHei",Arial,sans-serif;font-size:15px;line-height:1.7;overflow-x:hidden}a{color:inherit;text-decoration:none}button{font:inherit}.shell{width:min(1000px,calc(100% - 32px));margin:0 auto}.skip-link{position:fixed;left:16px;top:-80px;z-index:200;background:var(--purple);color:#fff;padding:10px 14px;border-radius:8px}.skip-link:focus{top:8px}.address-bar{position:fixed;inset:0 0 auto 0;height:22px;z-index:90;background:var(--dark);color:#F7F8FD;font-size:12px}.address-inner{height:22px;display:flex;align-items:center;justify-content:space-between;gap:16px}.text-action,.drawer-button,.icon-close,.search-top button{border:0;background:transparent;color:inherit;cursor:pointer;min-height:44px;padding:0 10px}.address-bar .text-action{min-height:22px;padding:0 4px}.window-bar{position:fixed;top:22px;left:0;right:0;height:54px;z-index:89;background:#E8E7F8;border-bottom:1px solid var(--strong)}.window-inner{height:54px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center}.brand-link{justify-self:start;display:flex;align-items:center;min-height:44px}.brand-logo,.footer-logo,.drawer-brand img{height:24px;max-width:150px;object-fit:contain;object-position:center}.brand-fallback{font-size:16px;font-weight:800;color:var(--title)}.app-shortcut{justify-self:center;min-height:44px;display:inline-flex;align-items:center;padding:0 18px;border-radius:12px;border:1px solid var(--strong);background:var(--content);color:var(--dark);font-size:14px;font-weight:700}.drawer-button{justify-self:end;color:var(--dark);font-weight:700}.tab-row{position:fixed;top:76px;left:0;right:0;min-height:42px;z-index:88;background:var(--warm);border-bottom:1px solid var(--border)}.tab-wrap{min-height:42px;display:flex;justify-content:center;align-items:center;flex-wrap:wrap;gap:6px;padding:4px 0}.tab-link{font-size:13px;padding:6px 14px;border-radius:999px;color:var(--muted);border:1px solid transparent}.tab-link:hover,.tab-link:focus-visible{border-color:var(--strong);outline:none}.tab-link.is-active{background:var(--purple);color:#fff}.site-main{padding-top:134px;padding-bottom:40px}.page-hero{padding:34px 0 20px}.eyebrow{margin:0 0 8px;color:var(--purple);font-size:13px;font-weight:800;letter-spacing:.08em}.page-hero h1,.home-intro h1{font-size:24px;line-height:1.3;margin:0 0 14px;color:var(--title)}h2{font-size:20px;line-height:1.4;color:var(--title)}h3{font-size:16px;line-height:1.5;color:var(--title)}p{margin:0 0 14px}.lead{font-size:16px;color:var(--muted);max-width:760px}.btn-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.btn-center{justify-content:center}.btn{min-height:42px;padding:9px 18px;border-radius:12px;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{background:var(--warm);border:1px solid var(--strong);color:var(--dark)}.btn:hover,.btn:focus-visible{transform:translateY(-1px);box-shadow:var(--shadow);outline:2px solid transparent}.section{padding:24px 0}.panel{background:var(--content);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow);padding:22px}.panel + .panel{margin-top:14px}.media-slot{background:#E8E8F7;border:1px solid var(--border);border-radius:12px;display:flex;align-items:center;justify-content:center;overflow:hidden}.media-slot img{display:block;width:100%;height:100%;object-fit:contain;object-position:center}.slot-banner{height:168px}.slot-wide{height:176px}.slot-standard{height:220px}.slot-app{height:300px}.slot-brand{height:240px}.muted-box{background:var(--sub);border-left:4px solid var(--purple);padding:14px 16px;border-radius:10px;color:var(--muted)}
/* home */.home-intro{padding:26px 0 16px}.window-demo{max-width:820px;margin:0 auto 22px;padding:12px;background:var(--content);border:1px solid var(--strong);border-radius:14px;box-shadow:var(--shadow)}.window-demo .demo-top{height:24px;display:flex;align-items:center;gap:6px;color:var(--soft);font-size:12px}.dot{width:8px;height:8px;border-radius:50%;background:var(--mist)}.home-intro-copy{max-width:760px}.single-story{display:grid;grid-template-columns:1fr;gap:18px}.step-stack{position:relative;display:grid;gap:12px;max-width:860px}.step-card{background:var(--content);border:1px solid var(--border);border-radius:14px;padding:20px;box-shadow:var(--shadow)}.step-card:nth-child(2){margin-left:24px}.tag-wrap{display:flex;flex-wrap:wrap;gap:9px;margin:12px 0}.tag-wrap span{background:#E6E8F8;border:1px solid var(--strong);color:var(--dark);padding:8px 12px;border-radius:999px;font-weight:700}.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.path-line{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}.path-line span{padding:9px 14px;border-radius:10px;background:var(--dark);color:#F7F8FD}.center-cards{display:grid;grid-template-columns:1fr 1fr;gap:16px;max-width:780px;margin:0 auto}.app-product{max-width:700px;margin:0 auto;text-align:center}.app-product .app-icon{width:48px;height:48px;object-fit:contain}.app-product .icon-holder{height:56px;display:flex;align-items:center;justify-content:center;margin-bottom:8px}.faq-mini details,.faq-list details{background:var(--content);border:1px solid var(--border);border-radius:12px;padding:14px 16px}.faq-mini details+details,.faq-list details+details{margin-top:10px}.faq-mini summary,.faq-list summary{cursor:pointer;color:var(--title);font-weight:800}.faq-mini details p,.faq-list details p{margin-top:10px;color:var(--muted)}
/* inner layout variations */.frame-layout{border:1px solid var(--strong);border-radius:14px;background:var(--content);padding:12px;box-shadow:var(--shadow)}.frame-bar{height:30px;background:#E5E7F6;border-radius:8px 8px 0 0;display:flex;align-items:center;padding:0 10px;color:var(--soft);font-size:12px}.frame-body{padding:18px}.stair-list{display:grid;gap:14px}.stair-list .stair{background:var(--content);border:1px solid var(--border);border-radius:14px;padding:20px;box-shadow:var(--shadow)}.stair-list .stair:nth-child(even){margin-left:34px}.label-layout .tag-wrap{margin-bottom:18px}.reading-layout{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(230px,.7fr);gap:18px}.reading-layout aside{background:var(--dark);color:#F7F8FD;border-radius:14px;padding:20px}.reading-layout aside h2,.reading-layout aside h3{color:#F7F8FD}.tool-list{display:grid;gap:12px}.tool-item{display:grid;grid-template-columns:80px 1fr;gap:16px;align-items:start;background:var(--content);border:1px solid var(--border);border-radius:14px;padding:18px}.tool-badge{background:var(--purple);color:white;border-radius:10px;padding:10px;text-align:center;font-weight:800}.split-layout{display:grid;grid-template-columns:1fr 1fr;gap:16px}.split-pane{background:var(--content);border:1px solid var(--border);border-radius:14px;padding:20px}.route-layout{display:grid;gap:12px}.route-step{display:grid;grid-template-columns:96px 1fr;gap:14px;align-items:start}.route-key{background:var(--dark);color:#fff;border-radius:10px;padding:10px 12px;text-align:center;font-weight:800}.note-list{display:grid;gap:12px}.note-row{background:var(--content);border:1px solid var(--border);border-radius:12px;padding:18px;display:grid;grid-template-columns:120px 1fr;gap:14px}.center-layout{max-width:760px;margin:0 auto;text-align:center}.center-layout .panel{text-align:left}.terms-layout{display:grid;gap:14px}.terms-layout section{background:var(--content);border:1px solid var(--border);border-radius:14px;padding:20px}.brand-layout{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:18px;align-items:start}.help-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.contact-box{max-width:780px;margin:0 auto;background:var(--content);border:1px solid var(--border);border-radius:14px;padding:24px}.list-clean{padding-left:20px}.list-clean li+li{margin-top:8px}.site-footer{background:var(--dark);color:#EEF0F8;border-top:1px solid var(--mist);padding:28px 0 calc(32px + env(safe-area-inset-bottom))}.footer-brand{padding-bottom:18px}.footer-logo-wrap{display:flex;align-items:center;gap:12px}.footer-logo-wrap strong{display:block}.footer-logo-wrap span{display:block;color:#BEC8E8;font-size:12px}.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding:18px 0;border-top:1px solid rgba(138,164,224,.28);border-bottom:1px solid rgba(138,164,224,.28)}.footer-grid h2{font-size:13px;color:#EEF0F8;margin:0 0 8px}.footer-grid a{display:block;font-size:13px;color:#D9DDF0;padding:4px 0}.footer-grid a:hover,.footer-grid a:focus-visible{color:white;text-decoration:underline}.footer-note{font-size:13px;color:#CAD1E8;padding-top:16px}.overlay{position:fixed;inset:0;background:rgba(28,26,58,.45);z-index:120;opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.overlay.is-open{opacity:1;visibility:visible;pointer-events:auto}.tool-drawer{position:fixed;right:16px;bottom:16px;width:min(360px,92vw);max-height:70vh;overflow:auto;z-index:130;background:var(--warm);color:var(--dark);border:1px solid var(--strong);border-radius:16px;box-shadow:0 22px 60px rgba(28,26,58,.28);transform:translateY(20px);opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.tool-drawer.is-open{transform:none;opacity:1;visibility:visible;pointer-events:auto}.drawer-head{position:sticky;top:0;background:var(--warm);display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px;border-bottom:1px solid var(--border);z-index:2}.drawer-brand{display:flex;align-items:center;gap:10px}.drawer-groups{padding:12px}.drawer-groups section+section{margin-top:14px}.drawer-groups h2{font-size:14px;margin:0 0 7px}.drawer-groups a{display:grid;grid-template-columns:110px 1fr;gap:10px;padding:9px;border-radius:10px}.drawer-groups a:hover,.drawer-groups a:focus-visible{background:var(--sub);outline:none}.drawer-groups b{font-size:14px}.drawer-groups span{font-size:12px;color:var(--muted)}.search-layer{position:fixed;top:76px;left:0;right:0;z-index:131;visibility:hidden;opacity:0;pointer-events:none;transition:.2s}.search-layer.is-open{visibility:visible;opacity:1;pointer-events:auto}.search-card{width:min(720px,calc(100% - 32px));margin:12px auto;background:#E8E7F8;border:1px solid var(--strong);border-radius:14px;box-shadow:var(--shadow);padding:18px;color:var(--dark)}.search-top{display:flex;align-items:center;justify-content:space-between;gap:12px}.search-top h2{margin:0}.search-presets{display:flex;flex-wrap:wrap;gap:8px}.search-presets a{background:var(--warm);border:1px solid var(--strong);border-radius:999px;padding:8px 12px;font-weight:700}.mobile-bottom{display:none}.modal-open{overflow:hidden}
@media (max-width:760px){.tab-row{display:none}.site-main{padding-top:88px;padding-bottom:76px}.shell{width:min(100% - 32px,1000px)}.window-inner{grid-template-columns:minmax(0,1fr) auto auto;gap:6px}.brand-logo{max-width:112px}.app-shortcut{padding:0 10px}.drawer-button{padding:0 6px}.home-intro{padding-top:20px}.compare-grid,.center-cards,.split-layout,.reading-layout,.brand-layout,.help-grid{grid-template-columns:1fr}.step-card:nth-child(2),.stair-list .stair:nth-child(even){margin-left:0}.tool-item{grid-template-columns:1fr}.route-step{grid-template-columns:1fr}.note-row{grid-template-columns:1fr}.footer-grid{grid-template-columns:repeat(2,1fr)}.tool-drawer{left:4%;right:4%;bottom:64px;width:92%;max-height:70vh}.search-layer{inset:0;background:var(--dark);color:#F7F8FD}.search-card{width:100%;height:100%;margin:0;border:0;border-radius:0;background:var(--dark);color:#F7F8FD;padding:82px 18px 20px}.search-top h2,.search-card p{color:#F7F8FD}.search-presets a{background:#28254F;color:#F7F8FD;border-color:rgba(138,164,224,.5)}.mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:100;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(--warm);border-top:1px solid var(--strong)}.mobile-bottom a{min-height:48px;display:flex;align-items:center;justify-content:center;font-size:13px;color:var(--muted)}.mobile-bottom a.is-active{background:var(--purple);color:#fff}.slot-app{height:280px}.slot-standard{height:190px}}
@media (max-width:460px){.address-inner span{max-width:75%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.footer-grid{grid-template-columns:1fr 1fr}.panel{padding:18px}.page-hero{padding-top:24px}}