:root{--brand: #3b4bd8;--brand-ink: #2a37b0;--brand-soft: #eef0ff;--bg: #ffffff;--surface: #f7f8fb;--surface-2: #f0f2f7;--text: #14161c;--muted: #5b606e;--faint: #8a8f9c;--border: #e4e7ef;--border-strong: #d2d6e2;--radius: 12px;--radius-sm: 8px;--maxw: 1040px;--prose: 740px;--font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;--mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;--section-pad: 52px;--hero-pad-top: 84px;--hero-pad-bottom: 56px;--container-pad: 24px;--grid-gap: 16px;--grid-cols: 3;--footer-cols: 1.4fr 1fr 1fr;--fs-h1: clamp(34px, 6vw, 56px);--fs-h2: clamp(23px, 3.2vw, 31px);--fs-h3: 17px;--fs-body: 16.5px;--lh-body: 1.65;--ls-tight: -.025em;--fw-heading: 700;--fw-body: 400;--ease-out: cubic-bezier(.22, .61, .36, 1);--ease-in-out: cubic-bezier(.4, 0, .2, 1);--dur-fast: .12s;--dur-base: .36s;--dur-page: .5s;--reveal-distance: 16px;--hover-lift: 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