:root{font-family:"Segoe UI","Microsoft YaHei",sans-serif;color:#192b3c;background:#f5f7fa;color-scheme:light;font-size:16px;--muted:#607489;--teal:#147b78}
*{box-sizing:border-box}body{margin:0}main{width:min(100% - 40px,560px);margin:56px auto 28px}header{display:flex;align-items:center;gap:12px;font-size:22px;font-weight:650;margin-bottom:24px}.mark{display:grid;place-items:center;width:44px;height:44px;border-radius:12px;background:var(--teal);color:white;font-size:28px}.card{padding:34px;background:white;border:1px solid #dce5ee;border-radius:18px}.eyebrow{font-size:14px;color:var(--teal);margin:0 0 10px;font-weight:600}h1{font-size:28px;line-height:1.4;letter-spacing:-.4px;margin:0}.intro{color:var(--muted);line-height:1.7;margin:12px 0 28px}.download{display:flex;align-items:center;justify-content:center;gap:18px;min-height:56px;padding:14px 18px;background:var(--teal);color:white;border-radius:9px;text-decoration:none;font-weight:650;font-size:18px}.download:hover{background:#096763}.meta{font-size:14px;line-height:1.8;text-align:center;color:var(--muted);margin:12px 0 28px}ol{padding:24px 0 0;list-style:none;counter-reset:steps;border-top:1px solid #e6edf3;margin:0}li{position:relative;padding:0 0 24px 40px;counter-increment:steps}li::before{content:counter(steps);position:absolute;left:0;top:0;display:grid;place-items:center;width:26px;height:26px;border-radius:50%;background:#eaf4f3;color:var(--teal);font-size:14px;font-weight:650}li strong{display:block;font-weight:600;line-height:1.7}li span{display:block;color:var(--muted);font-size:14px;line-height:1.7;margin-top:4px}.runtime{font-size:14px;line-height:1.8;margin:0;padding-top:20px;border-top:1px solid #e6edf3;color:var(--muted)}a{color:var(--teal);text-underline-offset:3px}a:focus-visible{outline:3px solid #53b7bc;outline-offset:5px}footer{display:flex;justify-content:space-between;gap:20px;margin:20px 4px;font-size:14px}footer a{color:var(--muted)}@media(max-width:480px){main{margin-top:28px}.card{padding:26px 22px}h1{font-size:24px}}