:root{
    --bg:#0b0f1a; --bg2:#111827; --panel:#0f1524; --border:#1e293b;
    --text:#e2e8f0; --muted:#94a3b8; --dim:#64748b;
    --accent:#38bdf8; --accent2:#818cf8; --ok:#34d399; --warn:#fbbf24; --err:#f87171;
    --radius:12px;
  }
  *{margin:0;padding:0;box-sizing:border-box}
  ::selection{background:rgba(56,189,248,.3)}
  ::-webkit-scrollbar{width:9px;height:9px}
  ::-webkit-scrollbar-track{background:transparent}
  ::-webkit-scrollbar-thumb{background:#26334d;border-radius:6px;border:2px solid transparent;background-clip:padding-box}
  body{
    font-family:-apple-system,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;
    height:100vh;overflow:hidden;display:flex;align-items:center;justify-content:center;
    background:radial-gradient(1100px 700px at 15% -10%,rgba(56,189,248,.12),transparent 60%),
               radial-gradient(900px 650px at 110% 115%,rgba(129,140,248,.14),transparent 60%),
               radial-gradient(700px 500px at 80% -8%,rgba(52,211,153,.06),transparent 55%),
               var(--bg);
    color:var(--text);
  }
  #bg{position:fixed;inset:0;width:100%;height:100%;z-index:0;pointer-events:none}
  .grid-overlay{position:fixed;inset:0;z-index:1;pointer-events:none;opacity:.5;
    background-image:linear-gradient(rgba(56,189,248,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(56,189,248,.05) 1px,transparent 1px);
    background-size:44px 44px;
    mask-image:radial-gradient(ellipse 70% 60% at 50% 45%,#000 30%,transparent 78%);
    -webkit-mask-image:radial-gradient(ellipse 70% 60% at 50% 45%,#000 30%,transparent 78%);
  }
  .scan{position:fixed;left:0;right:0;top:0;height:140px;z-index:2;pointer-events:none;
    background:linear-gradient(180deg,rgba(56,189,248,.06),transparent);animation:scan 8s linear infinite}
  @keyframes scan{0%{transform:translateY(-160px)}100%{transform:translateY(100vh)}}
  .login-wrap{position:relative;z-index:3;width:min(420px,92vw);animation:cardin .5s cubic-bezier(.2,.9,.3,1.1) both}
  @keyframes cardin{from{opacity:0;transform:translateY(24px) scale(.96)}to{opacity:1;transform:none}}
  .login-card{
    position:relative;background:rgba(15,21,36,.6);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
    border:1px solid rgba(56,189,248,.22);border-radius:var(--radius);padding:38px 36px 30px;
    box-shadow:0 0 0 1px rgba(129,140,248,.08),0 24px 70px rgba(0,0,0,.55),0 0 60px rgba(56,189,248,.10);
    overflow:hidden;
  }
  .login-card::before{content:'';position:absolute;top:0;left:0;right:0;height:1px;
    background:linear-gradient(90deg,transparent,rgba(56,189,248,.8),rgba(129,140,248,.8),transparent)}
  .login-card::after{content:'';position:absolute;top:10px;left:10px;width:14px;height:14px;border-top:1px solid rgba(56,189,248,.5);border-left:1px solid rgba(56,189,248,.5);
    border-top-left-radius:4px;opacity:.7}
  .logo{font-size:26px;font-weight:800;letter-spacing:3px;text-align:center;
    background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent;
    filter:drop-shadow(0 0 14px rgba(56,189,248,.55))}
  .sub{text-align:center;font-size:10px;color:var(--dim);letter-spacing:3px;margin:10px 0 30px;text-transform:uppercase}
  .field{margin-bottom:16px}
  .field label{display:block;font-size:11px;color:var(--dim);letter-spacing:1px;margin-bottom:7px}
  .field input{
    width:100%;background:rgba(11,15,26,.7);border:1px solid var(--border);color:var(--text);
    border-radius:8px;padding:12px 14px;font-size:13px;outline:none;font-family:inherit;
    transition:border-color .2s,box-shadow .2s;
  }
  .field input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(56,189,248,.15),0 0 18px rgba(56,189,248,.25)}
  .field input::placeholder{color:#475569}
  .err{min-height:18px;font-size:12px;color:var(--err);margin-bottom:10px;text-align:center;opacity:0;transition:opacity .2s}
  .err.show{opacity:1}
  .btn{
    width:100%;padding:13px;border-radius:8px;font-size:14px;font-weight:600;letter-spacing:4px;cursor:pointer;
    color:var(--text);background:linear-gradient(90deg,rgba(56,189,248,.22),rgba(129,140,248,.22));
    border:1px solid rgba(56,189,248,.45);transition:all .18s;display:flex;align-items:center;justify-content:center;gap:8px;
  }
  .btn:hover{box-shadow:0 0 24px rgba(56,189,248,.45);background:linear-gradient(90deg,rgba(56,189,248,.34),rgba(129,140,248,.34));transform:translateY(-1px)}
  .btn:active{transform:translateY(0) scale(.98)}
  .btn:disabled{opacity:.6;cursor:not-allowed;transform:none}
  .btn .spinner{display:none;width:14px;height:14px;border:2px solid currentColor;border-top-color:transparent;border-radius:50%;animation:spin .7s linear infinite}
  .btn.loading .spinner{display:inline-block}
  @keyframes spin{to{transform:rotate(360deg)}}
  @media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}