:root{color-scheme:light;--blue:#0b57d0;--blue-hover:#0842a0;--blue-soft:#dce9ff;--blue-pale:#eef4ff;--coral:#e9785d;--coral-soft:#ffe4dc;--sage:#6f8876;--sage-soft:#dde8df;--surface:#f9f9fc;--surface-low:#f3f4f8;--white:#fff;--ink:#1a1c1e;--muted:#5f6368;--outline:#d9dce3;--shadow:0 16px 40px rgba(32, 58, 96, .12);--topbar:rgba(249, 249, 252, .92);--hero-border:#d9e5f8;--on-primary:#fff;--download-muted:rgba(255, 255, 255, .78);--max:1120px}@media (prefers-color-scheme:dark){:root:not([data-theme]){color-scheme:dark;--blue:#a8c7fa;--blue-hover:#c2d7ff;--blue-soft:#173a68;--blue-pale:#14243a;--coral:#ffb4a3;--coral-soft:#633529;--sage:#adc7b2;--sage-soft:#334c3a;--surface:#111318;--surface-low:#1c1e24;--white:#1a1c21;--ink:#e2e2e9;--muted:#c4c6cf;--outline:#44474e;--shadow:0 16px 40px rgba(0, 0, 0, .32);--topbar:rgba(17, 19, 24, .9);--hero-border:#2d405c;--on-primary:#062e6f;--download-muted:rgba(6, 46, 111, .76)}}:root[data-theme=dark]{color-scheme:dark;--blue:#a8c7fa;--blue-hover:#c2d7ff;--blue-soft:#173a68;--blue-pale:#14243a;--coral:#ffb4a3;--coral-soft:#633529;--sage:#adc7b2;--sage-soft:#334c3a;--surface:#111318;--surface-low:#1c1e24;--white:#1a1c21;--ink:#e2e2e9;--muted:#c4c6cf;--outline:#44474e;--shadow:0 16px 40px rgba(0, 0, 0, .32);--topbar:rgba(17, 19, 24, .9);--hero-border:#2d405c;--on-primary:#062e6f;--download-muted:rgba(6, 46, 111, .76)}:root[data-theme=light]{color-scheme:light}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-width:320px;background:var(--surface);color:var(--ink);font-family:Roboto,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased}a,button{font:inherit}a{color:inherit;text-decoration:none}.container{width:min(calc(100% - 48px),var(--max));margin:0 auto}.topbar{position:sticky;top:0;z-index:20;background:var(--topbar);border-bottom:1px solid 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.sun{display:none}:root:not([data-theme]) .theme-toggle .moon{display:block}}.nav-link{min-height:40px;padding:8px 14px;border-radius:8px;color:var(--muted);font-size:14px;font-weight:600}.nav-link:hover{background:var(--surface-low);color:var(--ink)}.button{min-height:48px;padding:12px 22px;border:1px solid transparent;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;gap:9px;font-size:15px;font-weight:700;cursor:pointer;transition:background-color .18s ease,border-color .18s ease,box-shadow .18s ease}.button-primary{background:var(--blue);color:var(--on-primary)}.button-primary:hover{background:var(--blue-hover);box-shadow:0 6px 18px rgba(11,87,208,.22)}.button-secondary{border-color:var(--outline);background:0 0;color:var(--blue)}.button-secondary:hover{background:var(--blue-pale);border-color:#b7c9e8}.button .arrow{font-size:20px;line-height:1}.hero{min-height:min(720px,calc(100svh - 68px));padding:62px 0 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