:root{font-family:"Microsoft YaHei UI",Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#17243b;background:#f4f7fb;--primary:#2563eb;--line:#dfe6f0;--muted:#74829b;--danger:#c73d55}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(circle at 20% 15%,rgba(37,99,235,.08),transparent 34%),linear-gradient(180deg,#f8fafd,#f2f6fb);color:#17243b}.login-shell{min-height:100vh;display:grid;place-items:center;padding:28px}.login-card{width:min(460px,100%);padding:32px;border:1px solid var(--line);border-radius:22px;background:#fff;box-shadow:0 24px 70px rgba(45,68,105,.12)}.brand-row{display:flex;align-items:center;gap:12px}.brand-mark{width:46px;height:46px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(145deg,#2563eb,#5d8df2);color:#fff;font-weight:900;box-shadow:0 10px 22px rgba(37,99,235,.22)}.brand-row strong,.brand-row span{display:block}.brand-row strong{font-size:16px}.brand-row span{margin-top:3px;color:var(--muted);font-size:12px}.login-copy{margin-top:30px}.eyebrow{display:block;color:var(--primary);font-size:11px;font-weight:900;letter-spacing:.16em}.login-copy h1{margin:8px 0 8px;font-size:30px;letter-spacing:-.035em}.login-copy p{margin:0;color:var(--muted);font-size:13px;line-height:1.75}.error-box{margin-top:20px;padding:12px 13px;border:1px solid #f1c4cd;border-radius:11px;background:#fff2f4;color:var(--danger);font-size:13px}form{display:grid;gap:16px;margin-top:24px}label{display:grid;gap:8px;color:#4d5e79;font-size:13px;font-weight:800}input{width:100%;height:46px;padding:0 13px;border:1px solid #d4deeb;border-radius:11px;background:#fff;color:#17243b;font:inherit;outline:none}input:focus{border-color:#79a0ee;box-shadow:0 0 0 3px rgba(37,99,235,.10)}button{height:46px;border:0;border-radius:11px;background:var(--primary);color:#fff;font:inherit;font-weight:900;cursor:pointer;box-shadow:0 9px 20px rgba(37,99,235,.20)}button:hover{background:#1d4ed8}button:disabled{opacity:.55;cursor:not-allowed}.security-note{display:grid;grid-template-columns:auto 1fr;gap:10px;margin-top:24px;padding-top:20px;border-top:1px solid var(--line)}.security-note>span{width:9px;height:9px;margin-top:6px;border-radius:50%;background:#22b987;box-shadow:0 0 0 5px rgba(34,185,135,.10)}.security-note p{margin:0;color:var(--muted);font-size:11px;line-height:1.7}.security-note code{padding:2px 5px;border-radius:5px;background:#f0f4fa;color:#456084}@media(max-width:560px){.login-shell{padding:16px}.login-card{padding:24px;border-radius:18px}.login-copy h1{font-size:26px}}