:root{--bg:#f7fafc;--ink:#16202a;--muted:#6a7480;--brand:#2a7de1;--brand2:#64c3ff;--line:#e4e9ef}
*{box-sizing:border-box}body{margin:0;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:var(--bg);line-height:1.65}a{text-decoration:none;color:inherit}.wrap{width:min(1100px,92%);margin:auto}header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.nav{height:76px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{font-weight:800;font-size:25px;display:flex;align-items:center;gap:10px}.brand .dot{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--brand2));display:grid;place-items:center;color:#fff}nav{display:flex;gap:22px;font-size:14px;color:#445}.hero{padding:92px 0;background:linear-gradient(135deg,#eef7ff,#fbfdff)}.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:50px;align-items:center}h1,h2,h3{line-height:1.15;margin:0 0 18px}h1{font-size:clamp(42px,7vw,74px)}h2{font-size:38px}.lead{font-size:19px;color:var(--muted)}.upload-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:30px;box-shadow:0 20px 50px rgba(50,80,120,.08)}.fake-drop{border:2px dashed #b9d8f6;border-radius:16px;padding:54px 20px;text-align:center;color:#567;background:#f8fcff}.btn{display:inline-block;background:var(--brand);color:#fff;padding:12px 18px;border-radius:10px;margin-top:18px}.section{padding:76px 0}.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:26px}.muted{color:var(--muted)}.pagehero{padding:68px 0 38px}.article{background:#fff;border:1px solid var(--line);border-radius:18px;padding:40px;margin-bottom:70px}.article h2{font-size:28px;margin-top:30px}.article ul{padding-left:22px}footer{background:#102131;color:#d6e1eb;padding:42px 0;margin-top:30px}.foot{display:flex;justify-content:space-between;gap:28px;flex-wrap:wrap}.foot a{color:#d6e1eb;margin-right:16px}@media(max-width:800px){nav{display:none}.hero-grid,.grid3{grid-template-columns:1fr}}