:root{--bg:#f8f9fb;--card:#fff;--text:#171717;--muted:#717780;--line:#e4e7eb;--soft:#f5f6f8;--dark:#151619;--blue:#1478ef;--green:#20a56c;--red:#e14747;--amber:#d98700;--shadow:0 1px 2px rgba(0,0,0,.03)}*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:Inter,"PingFang SC","Microsoft YaHei",Arial,sans-serif;color:var(--text);background:var(--bg);font-size:14px}button,input,textarea,select{font:inherit;color:inherit}.hidden{display:none!important}button{cursor:pointer}.login-shell{min-height:100vh;display:grid;place-items:center;background:#f5f6f8}.login-card{width:min(410px,92vw);background:#fff;border:1px solid var(--line);border-radius:12px;padding:32px;box-shadow:0 18px 55px rgba(0,0,0,.08)}.login-logo{width:48px;height:48px;border-radius:10px;background:#111;color:#fff;display:grid;place-items:center;font-weight:800;margin-bottom:18px}.login-card h1{font-size:23px;margin:0 0 6px}.login-card p{margin:0 0 24px;color:var(--muted)}.login-card 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