/* 延续应用的蓝色品牌；本地系统字体可避免第三方字体请求。 */
:root{color-scheme:light;--blue:#046cdf;--ink:#152a43;--muted:#5b6d81;--paper:#f3f6fb}
*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--paper);font:17px/1.85 "PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif}a{color:#005dc3;text-underline-offset:4px}a:focus-visible{outline:3px solid var(--blue);outline-offset:5px}header{max-width:1000px;margin:auto;padding:28px 32px;display:flex;align-items:center;justify-content:space-between;gap:20px}header .brand{display:flex;align-items:center;gap:12px;font-size:21px;font-weight:700;text-decoration:none;color:var(--ink)}.brand img{border-radius:13px}nav{display:flex;gap:22px;font-size:15px}main{max-width:1000px;margin:8px auto 70px;padding:48px 64px 64px;background:white;border-top:5px solid var(--blue);border-radius:0 0 20px 20px}h1{font-size:38px;line-height:1.35;letter-spacing:-1px;margin:0 0 24px}h2{font-size:24px;line-height:1.5;margin:36px 0 12px}h3{font-size:19px;margin:25px 0 8px}p,li{max-width:44em}p{margin:12px 0}ul,ol{padding-left:1.4em}.notice{padding:14px 18px;background:#fff4d8;border-left:4px solid #b97a0a;margin-bottom:28px;font-size:15px}.lead{font-size:23px;line-height:1.7;max-width:26em;color:var(--muted)}.cta{display:inline-block;margin:14px 14px 0 0;padding:10px 22px;border-radius:8px;background:var(--blue);color:white;text-decoration:none;font-weight:600}.plain{background:var(--paper);color:var(--blue)}footer{max-width:1000px;margin:0 auto;padding:0 32px 40px;color:var(--muted);font-size:14px}footer a{margin-left:18px}@media(max-width:640px){header{padding:20px;align-items:flex-start}nav{flex-direction:column;gap:3px}main{margin:0 12px 40px;padding:30px 23px 40px}h1{font-size:30px}h2{font-size:22px}.lead{font-size:20px}footer{padding:0 24px 30px}}