:root{--primary:#5B4BDB;--primary-soft:#8B7CF6;--deep:#1E1B2E;--bg:#F7F7FB;--soft:#EFEFFC;--text:#292734;--muted:#6F6B7A;--accent:#F05A7E;--white:#fff;--line:#deddea;--radius:22px;--shadow:0 18px 55px rgba(30,27,46,.08);--shell:min(1180px,calc(100% - 40px));font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);line-height:1.7}img{max-width:100%;display:block}a{color:inherit;text-decoration:none}a:hover{color:var(--primary)}button,input,textarea{font:inherit}.shell{width:var(--shell);margin-inline:auto}.skip-link{position:fixed;left:16px;top:-60px;z-index:100;background:var(--deep);color:#fff;padding:10px 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p{color:var(--muted);font-size:1.05rem}@media(max-width:900px){:root{--shell:min(100% - 28px,780px)}.menu-toggle{display:inline-flex}.site-nav{position:absolute;top:68px;right:14px;left:14px;display:none;flex-direction:column;align-items:stretch;background:#fff;border:1px solid var(--line);border-radius:18px;padding:10px;box-shadow:var(--shadow)}.site-nav.is-open{display:flex}.hero,.page-hero,.split-section,.mini-feature,.two-col-layout,.note-panel{grid-template-columns:1fr}.hero{padding:48px 0;min-height:auto;gap:34px}.hero h1{font-size:clamp(2.6rem,9vw,4.5rem)}.card-grid.three,.story-grid,.app-facts{grid-template-columns:1fr 1fr}.side-panel{position:static}.footer-grid{grid-template-columns:1fr 1fr}.footer-grid>div:first-child{grid-column:1/-1}.page-hero{gap:30px}.visual-pair{grid-template-columns:1fr}.cta-panel{align-items:flex-start;flex-direction:column}}@media(max-width:640px){:root{--shell:calc(100% - 22px)}.header-inner{min-height:68px}.brand 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:focus-visible{outline:3px solid var(--accent);outline-offset:3px}