:root{color-scheme:light;--ink:#111827;--muted:#6b7280;--line:#d9dde5;--danger:#b42318}
*{box-sizing:border-box}html,body{min-height:100%;margin:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;background:#fff;color:var(--ink);font-size:14px}
.page{min-height:100vh;display:grid;place-items:center;padding:32px 20px}.login{width:min(100%,360px)}
.brand-mark{display:flex;align-items:flex-end;gap:5px;height:28px;margin-bottom:26px}.brand-mark span{display:block;width:7px;background:#111827;border-radius:2px}.brand-mark span:nth-child(1){height:12px}.brand-mark span:nth-child(2){height:20px}.brand-mark span:nth-child(3){height:28px}
.eyebrow{margin:0 0 8px;color:var(--muted);font-size:12px;letter-spacing:.16em}h1{margin:0;font-size:30px;line-height:1.2;letter-spacing:-.02em;font-weight:700}.subtitle{margin:10px 0 30px;color:var(--muted);line-height:1.6}
form{display:grid;gap:10px}label{font-size:13px;font-weight:600;margin-top:6px}input{width:100%;height:44px;border:1px solid var(--line);border-radius:8px;background:#fff;padding:0 12px;color:var(--ink);font:inherit;outline:none;transition:border-color .15s,box-shadow .15s}input:focus{border-color:#111827;box-shadow:0 0 0 3px rgba(17,24,39,.08)}
button{height:44px;margin-top:12px;border:0;border-radius:8px;background:#111827;color:#fff;font:600 14px/1 inherit;cursor:pointer}button:hover{background:#252c38}button:active{transform:translateY(1px)}.remember{margin:18px 0 0;text-align:center;color:var(--muted);font-size:12px}.error{margin:0 0 14px;padding:10px 12px;border:1px solid #f2c6c2;border-radius:8px;background:#fff7f6;color:var(--danger);font-size:13px;line-height:1.5}
@media(max-width:480px){.page{place-items:start center;padding-top:18vh}.login{width:100%}}@media(prefers-reduced-motion:reduce){*{transition:none!important}}