:root{--bg:#EEF0F8;--deep-bg:#E0E4F2;--surface:#F7F8FD;--surface-2:#EBEEF8;--title:#1A1840;--text:#2C2A48;--muted:#5A5680;--soft:#7A76A0;--purple:#5B4BDB;--blue:#3A6BD4;--dark:#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);--radius:12px}
*{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;padding-top:118px}a{color:var(--blue);text-decoration:none}a:hover{color:var(--purple)}button,a{touch-action:manipulation}button{font:inherit}img{max-width:100%;height:auto}.shell{width:min(1000px,calc(100% - 32px));margin:0 auto}.skip-link{position:fixed;left:16px;top:-80px;z-index:1300;background:var(--surface);color:var(--dark);padding:10px 14px;border-radius:10px;border:1px solid var(--focus)}.skip-link:focus{top:10px}.top-stack{position:fixed;inset:0 0 auto 0;z-index:1000;box-shadow:0 4px 18px rgba(28,26,58,.06)}.address-bar{height:22px;background:var(--dark);color:var(--surface)}.address-inner{height:22px;display:flex;align-items:center;justify-content:space-between;font-size:12px;line-height:1}.plain-control{position:relative;border:0;background:transparent;color:inherit;padding:0 6px;min-height:22px;cursor:pointer}.plain-control:before{content:"";position:absolute;inset:-11px -8px}.masthead{height:54px;background:#E7E5F6;border-bottom:1px solid var(--border)}.masthead-inner{height:54px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px}.brand-home{justify-self:start;display:flex;align-items:center;min-height:44px;max-width:220px;color:var(--title)}.brand-logo{height:24px;width:auto;object-fit:contain;object-position:center;display:block}.brand-text{font-size:16px;font-weight:700}.app-entry{justify-self:center;display:inline-flex;align-items:center;justify-content:center;height:40px;padding:0 18px;color:var(--surface);background:linear-gradient(135deg,#8AA4E0 0%,#5B4BDB 55%,#3A6BD4 100%);border-radius:999px;font-size:14px;font-weight:700}.drawer-open,.drawer-close,.search-close{border:1px solid var(--focus);background:var(--surface);color:var(--dark);height:40px;padding:0 14px;border-radius:999px;cursor:pointer;font-size:14px}.drawer-open{justify-self:end}.category-tabs{height:42px;background:var(--surface);border-bottom:1px solid var(--border)}.tab-wrap{height:42px;display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap;overflow:hidden}.tab-link{display:inline-flex;align-items:center;justify-content:center;min-height:30px;padding:3px 13px;border:1px solid var(--border);border-radius:999px;color:var(--dark);font-size:13px;background:var(--surface)}.tab-link.is-active{background:var(--purple);color:var(--surface);border-color:var(--purple)}main{min-height:60vh}.page-section{padding:42px 0}.page-section.compact{padding:28px 0}.page-section.deep{background:var(--deep-bg)}.page-section.light{background:var(--surface)}.page-section.soft{background:var(--surface-2)}.page-section.dark{background:var(--dark);color:var(--surface)}.eyebrow{margin:0 0 8px;color:var(--purple);font-size:13px;font-weight:700;letter-spacing:.08em}.dark .eyebrow{color:#C7D5F5}h1,h2,h3{color:var(--title);line-height:1.3;margin-top:0}.dark h1,.dark h2,.dark h3{color:var(--surface)}h1{font-size:24px;margin-bottom:16px}h2{font-size:20px;margin-bottom:14px}h3{font-size:16px;margin-bottom:8px}p{margin:0 0 14px}.lead{font-size:16px;color:var(--muted);max-width:760px}.dark .lead,.dark p{color:#E6E9F4}.muted{color:var(--muted)}.hero-actions,.button-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:0 18px;border-radius:10px;font-size:14px;font-weight:700;border:1px solid transparent}.btn-primary{background:linear-gradient(135deg,#8AA4E0 0%,#5B4BDB 55%,#3A6BD4 100%);color:var(--surface)}.btn-primary:hover{color:white;filter:brightness(.98)}.btn-secondary{background:var(--surface);border-color:var(--purple);color:var(--dark)}.btn-secondary:hover{background:#ECEAF8;color:var(--purple)}a:focus-visible,button:focus-visible{outline:3px solid var(--focus);outline-offset:3px}.media-slot{background:#EEEAF8;border:1px solid var(--border);border-radius:14px;display:flex;align-items:center;justify-content:center;overflow:hidden;padding:10px}.media-slot img{width:100%;height:100%;object-fit:contain;object-position:center}.slot-168{height:168px}.slot-176{height:176px}.slot-220{height:220px}.slot-280{height:280px}.slot-320{height:320px}.window-hero{background:var(--surface);border:1px solid var(--focus);border-radius:14px;box-shadow:var(--shadow);overflow:hidden}.window-bar{height:34px;background:#E7E5F6;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:7px;padding:0 12px}.window-dot{width:8px;height:8px;border-radius:50%;background:var(--mist)}.window-dot:nth-child(2){background:var(--lilac)}.window-dot:nth-child(3){background:var(--blue)}.window-body{padding:18px}.home-intro{display:grid;gap:20px}.long-copy{max-width:800px}.article-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:22px;align-items:start}.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){transform:translateX(24px)}.stair-card:nth-child(3){transform:translateX(8px)}.tag-cloud{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0}.tag-cloud span,.tag-cloud a{display:inline-flex;align-items:center;min-height:38px;padding:4px 14px;border-radius:999px;border:1px solid var(--focus);color:var(--dark);background:#EEEAF8}.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.compare-pane{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:18px;min-width:0}.path-strip{display:flex;gap:10px;align-items:stretch;flex-wrap:wrap}.path-step{flex:1 1 180px;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:18px}.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:12px;padding:20px;text-align:center}.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);text-align:center}.product-icon{width:48px;height:48px;object-fit:contain;margin:0 auto 10px;display:block}.product-visual{max-width:360px;margin:18px auto}.note-list,.tool-list,.term-list{display:grid;gap:12px}.note-item,.tool-item,.term-item{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:18px}.tool-item{display:grid;grid-template-columns:140px 1fr;gap:18px}.tool-item strong{color:var(--title)}.term-item h2{margin-bottom:8px}.faq-list{display:grid;gap:14px}.faq-item{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:18px}.faq-item h2{font-size:17px}.points{padding-left:1.25em;margin:10px 0 0}.points li{margin:7px 0}.callout{background:#E6E3F6;border-left:4px solid var(--purple);border-radius:10px;padding:16px 18px;color:var(--dark)}.dark-callout{background:var(--dark);color:var(--surface);border-radius:12px;padding:20px}.dark-callout h2{color:var(--surface)}.content-stack{display:grid;gap:18px}.prose-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:20px}.reading-demo{max-width:760px;margin:0 auto;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:28px}.reading-demo .sample{background:#F0F1F8;border-radius:12px;padding:20px;margin-top:14px}.install-steps{counter-reset:step;display:grid;gap:14px}.install-step{counter-increment:step;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:18px 18px 18px 64px;position:relative}.install-step:before{content:counter(step);position:absolute;left:18px;top:18px;width:30px;height:30px;border-radius:50%;display:grid;place-items:center;background:var(--purple);color:var(--surface);font-weight:700}.contact-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.contact-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:20px}.site-footer{background:var(--dark);color:var(--surface);border-top:1px solid var(--mist);padding:34px 0 72px;font-size:13px}.footer-grid{display:grid;grid-template-columns:2fr repeat(4,1fr);gap:24px}.footer-grid h2{font-size:14px;color:var(--surface);margin-bottom:10px}.footer-grid a{display:block;color:#DDE4F5;margin:5px 0}.footer-grid a:hover{color:#fff}.footer-brandline{display:flex;align-items:center;gap:10px;margin-bottom:10px}.footer-brandline div{display:flex;flex-direction:column;line-height:1.25}.footer-brand p{color:#CCD2E4;margin:0}.footer-bottom{border-top:1px solid rgba(138,164,224,.28);margin-top:24px;padding-top:16px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}.footer-bottom a{color:#DDE4F5}.screen-mask{position:fixed;inset:0;background:rgba(28,26,58,.42);z-index:1090;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .18s ease,visibility .18s ease}.screen-mask.is-active{opacity:1;visibility:visible;pointer-events:auto}.tool-drawer{position:fixed;right:16px;bottom:16px;width:min(360px,92vw);max-height:70vh;background:var(--surface);z-index:1120;border:1px solid var(--focus);border-radius:14px;box-shadow:0 24px 60px rgba(28,26,58,.24);transform:translateY(18px);opacity:0;visibility:hidden;pointer-events:none;transition:.18s ease}.tool-drawer.is-open{transform:none;opacity:1;visibility:visible;pointer-events:auto}.drawer-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:14px;border-bottom:1px solid var(--border)}.drawer-brand{display:flex;align-items:center;gap:10px;color:var(--title)}.drawer-scroll{overflow:auto;max-height:calc(70vh - 70px);padding:10px 14px 18px}.drawer-scroll section+section{margin-top:14px}.drawer-scroll h2{font-size:14px;margin:0 0 6px;color:var(--muted)}.drawer-scroll a{display:grid;grid-template-columns:92px 1fr;gap:10px;padding:8px 0;border-bottom:1px dashed var(--border);color:var(--dark)}.drawer-scroll a span{color:var(--muted);font-size:12px}.search-panel{position:fixed;top:76px;left:0;right:0;z-index:1110;visibility:hidden;opacity:0;pointer-events:none;transform:translateY(-8px);transition:.18s ease}.search-panel.is-open{visibility:visible;opacity:1;pointer-events:auto;transform:none}.search-card{background:#E7E5F6;border:1px solid var(--focus);border-radius:0 0 14px 14px;padding:18px;box-shadow:var(--shadow)}.search-top{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.search-top strong{color:var(--title);font-size:18px}.search-top p{color:var(--muted);margin:3px 0 0}.search-presets{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}.search-presets a{display:inline-flex;align-items:center;min-height:40px;padding:0 14px;border:1px solid var(--focus);border-radius:999px;background:var(--surface);color:var(--dark)}.overlay-lock{overflow:hidden}.mobile-bottom{display:none}.two-col-copy{columns:2 300px;column-gap:26px}.two-col-copy p{break-inside:avoid}.about-cover{max-width:760px;margin:0 auto 20px}
@media(max-width:780px){body{padding-top:76px;padding-bottom:60px}.shell{width:calc(100% - 32px)}.category-tabs{display:none}.masthead-inner{grid-template-columns:minmax(0,1fr) auto auto;gap:8px}.brand-home{min-width:0;overflow:hidden}.brand-logo{max-width:120px}.brand-text{white-space:nowrap;font-size:14px}.app-entry,.drawer-open{height:44px;padding:0 12px}.article-grid,.compare-grid,.center-cards,.contact-options,.footer-grid{grid-template-columns:1fr}.stair-card:nth-child(2),.stair-card:nth-child(3){transform:none}.tool-item{grid-template-columns:1fr;gap:5px}.page-section{padding:32px 0}.slot-320{height:300px}.footer-grid{gap:18px}.site-footer{padding-bottom:82px}.tool-drawer{right:4%;bottom:62px;width:92%;max-height:70vh}.drawer-scroll{max-height:calc(70vh - 70px)}.search-panel{top:22px;bottom:0;background:var(--dark);display:flex;align-items:flex-start;padding-top:54px}.search-card{width:100%;min-height:calc(100vh - 22px);border-radius:0;border:0;background:var(--dark);color:var(--surface);box-shadow:none}.search-top strong{color:var(--surface)}.search-top p{color:#D9DDF0}.search-close{background:var(--surface)}.search-presets a{background:#2A2751;color:var(--surface);border-color:rgba(138,164,224,.45);min-height:44px}.mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:1060;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(--surface);border-top:1px solid var(--border);box-shadow:0 -5px 18px rgba(28,26,58,.08)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;color:var(--dark);font-size:13px;min-height:48px}.mobile-bottom a.is-active{background:var(--purple);color:var(--surface)}.footer-bottom{padding-bottom:4px}.two-col-copy{columns:1}}
@media(max-width:390px){.address-inner span{max-width:74%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.app-entry,.drawer-open{font-size:13px;padding:0 10px}.masthead-inner{gap:5px}}