:root{--ink:#1d1d1f;--muted:#6e6e73;--blue:#0066cc;--bg:#f5f5f7;--line:#d2d2d7;--radius:16px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:92px}body{margin:0;font-family:Inter,'Microsoft YaHei',system-ui,sans-serif;color:var(--ink);background:#fff;line-height:1.65}a{color:inherit;text-decoration:none}button{font:inherit;cursor:pointer;color:inherit}button,a{-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #0066cc;outline-offset:5px}h1,h2,h3,p,figure{margin-top:0}.wrap{max-width:1200px;margin:0 auto;padding-left:32px;padding-right:32px}.top{display:flex;align-items:center;justify-content:space-between;gap:30px;min-height:72px;max-width:1280px;padding:16px 32px;margin:auto;border-bottom:1px solid #ececee}.brand{font-size:18px;font-weight:750;white-space:nowrap}nav{display:flex;gap:28px;font-size:14px;color:#515157}nav 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@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.play-symbol{transition:none}}