:root{--bg:#fff;--bg-soft:#fafbfc;--bg-dark:#0a0c11;--ink:#0b0d12;--ink-2:#4c5362;--ink-3:#6d7380;--ink-inv:#fff;--ink-inv-2:#ffffffad;--line:#e9ebef;--line-strong:#d8dce3;--line-dark:#ffffff24;--ink-ghost:#858d9c;--brand:#6d4aff;--brand-ink:#4b2fd0;--brand-soft:#f4f1ff;--mark-no:#d92d20;--mark-yes:#0f7b52;--radius-sm:4px;--radius:6px;--shadow-lg:0 16px 40px -24px #0b0d1238;--font-sans:system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;--font-mono:ui-monospace, SFMono-Regular, "SF Mono", "Cascadia Code", Consolas, "Liberation Mono", monospace;--container:1200px;--section-y:clamp(72px, 8vw, 128px);--header-h:69px;scroll-padding-top:calc(var(--header-h) + 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.18s,border-color .18s,color .18s;display:inline-flex}.btn--primary{background:var(--ink);color:#fff}.btn--primary:hover{background:#23262e}.btn--brand{z-index:0;background:var(--ink);color:#fff;position:relative;overflow:hidden}.btn--brand:hover{background:#23262e}.btn--brand:after{content:"";z-index:-1;pointer-events:none;background:linear-gradient(100deg,#4f46e500 0%,#4f46e5b3 42%,#7e71fff2 52%,#4f46e5b3 62%,#4f46e500 100%);width:42%;animation:3s ease-in-out infinite btn-sheen;position:absolute;top:-30%;bottom:-30%;left:0;transform:translate(-130%)skew(-18deg)}@keyframes btn-sheen{0%,64%{transform:translate(-130%)skew(-18deg)}82%,to{transform:translate(280%)skew(-18deg)}}.btn--ghost{border-color:var(--line-strong);color:var(--ink);background:#fff}.btn--ghost:hover{border-color:var(--ink)}.section--dark .btn--ghost{border-color:var(--line-dark);color:var(--ink-inv);background:0 0}.section--dark .btn--ghost:hover{border-color:#fff6}.section--dark 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