:root{--canvas:#f7f8f8;--surface:#fff;--text:#151817;--text-muted:#6b7271;--line:#e4e8e7;--demo-tint:#e8f2f5;--accent:#2534d8;--accent-soft:#e9ebff;--page-inline:clamp(28px, 4vw, 72px);--stage-max:1600px;--text-xs:12px;--text-sm:14px;--text-body:clamp(16px, 1.15vw, 18px);--text-lead:clamp(18px, 1.4vw, 22px);--text-h2:clamp(40px, 4.2vw, 68px);--text-hero:clamp(52px, 5.8vw, 88px);--font-main:"Microsoft YaHei UI", "Microsoft YaHei", sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth;background:var(--canvas)}body{background:var(--canvas);min-width:320px;color:var(--text);font-family:var(--font-main);font-size:var(--text-body);-webkit-font-smoothing:antialiased;margin:0;line-height:1.6}button,a{font:inherit}button:focus-visible,a:focus-visible{outline:2px solid var(--accent);outline-offset:4px}.site-shell{min-height:100vh}.site-header{z-index:20;height:64px;padding:0 var(--page-inline);border-bottom:1px solid color-mix(in srgb, var(--line) 86%, transparent);background:color-mix(in srgb, var(--canvas) 88%, transparent);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);grid-template-columns:1fr auto 1fr;align-items:center;gap:24px;display:grid;position:fixed;inset:0 0 auto}.site-header p,.header-meta,.brand{font-size:var(--text-xs);letter-spacing:.04em;margin:0}.brand{color:var(--text);align-items:center;gap:10px;font-weight:700;text-decoration:none;display:flex}.brand-mark{background:var(--text);color:#fff;letter-spacing:-.04em;border-radius:50%;place-items:center;width:30px;height:30px;font-size:10px;display:grid}.header-meta{color:var(--text-muted);justify-self:end;gap:20px;display:flex}.site-footer{min-height:54vh;padding:clamp(80px, 12vw, 180px) var(--page-inline) 56px;background:var(--text);color:#fff;flex-direction:column;justify-content:space-between;display:flex}.site-footer p{letter-spacing:-.045em;max-width:980px;margin:0;font-size:clamp(38px,5vw,76px);line-height:1.12}.site-footer div{color:#bfc5c3;font-size:var(--text-sm);flex-wrap:wrap;gap:12px 34px;display:flex}@media (width<=767px){.site-header{grid-template-columns:1fr auto;height:58px;position:sticky}.site-header p,.header-meta span:first-child{display:none}.site-footer{min-height:440px}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}.story-desktop{min-height:660vh;position:relative}.story-sticky{z-index:2;height:calc(100vh - 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