:root{--ink:#20344f;--muted:#546b85;--blue:#1c63bb;--line:#dce8f5;--paper:#fff;--sky:#f2f8ff}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--sky);font-family:"PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.85}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}a:focus-visible,button:focus-visible{outline:3px solid var(--blue);outline-offset:4px}header,footer,main{width:min(900px,calc(100% - 40px));margin:auto}header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:24px 0}.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink);font-size:20px;font-weight:600}.brand img{width:36px;height:36px}header>a:last-child{padding:10px 0;min-height:44px}main{background:var(--paper);border:1px solid var(--line);border-radius:16px;padding:40px}h1{font-size:30px;line-height:1.4;margin:0 0 12px}h2{font-size:20px;line-height:1.6;margin:32px 0 12px}p{margin:12px 0}li{margin:8px 0}small,.meta{color:var(--muted);font-size:14px}.notice{padding:16px 20px;background:var(--sky);border-left:3px solid var(--blue);margin:24px 0}nav{display:flex;flex-wrap:wrap;gap:0 20px}nav a{display:inline-flex;align-items:center;min-height:44px}footer{padding:24px 0 32px;color:var(--muted);font-size:14px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;min-width:120px;padding:10px 20px;border:1px solid var(--blue);border-radius:9px;color:#fff;background:var(--blue);font:inherit;cursor:pointer}.button.secondary{background:#fff;color:var(--blue)}.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}.error{text-align:center}.error img{width:min(320px,100%);height:auto}.error .code{font-size:18px;color:var(--blue);letter-spacing:4px}.error p{color:var(--muted)}@media(max-width:600px){header,footer,main{width:calc(100% - 32px)}header{padding:18px 0}.brand{font-size:18px}main{padding:26px 20px}h1{font-size:25px}h2{font-size:19px}.notice{padding:12px 14px}ul{padding-left:22px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto}}
main p a{text-decoration:underline;text-underline-offset:3px}