:root{
    --brand:#4F46E5;
    --brand-hover:#4338CA;
    --brand-soft:#EEF2FF;
    --brand-ring:rgba(79,70,229,.16);
    --sidebar:#111827;
    --sidebar-2:#1F2937;
    --bg:#F8FAFC;
    --card:#FFFFFF;
    --on-brand:#FFFFFF;
    --text:#111827;
    --text-2:#6B7280;
    --text-3:#9CA3AF;
    --on-dark:#F9FAFB;
    --on-dark-2:#9CA3AF;
    --border:#E5E7EB;
    --border-strong:#D1D5DB;
    --success:#16A34A;
    --success-soft:#F0FDF4;
    --success-border:#BBF7D0;
    --warning:#D97706;
    --warning-soft:#FFFBEB;
    --warning-border:#FDE68A;
    --danger:#DC2626;
    --danger-soft:#FEF2F2;
    --danger-border:#FECACA;
    --shadow-md:0 12px 32px rgba(17,24,39,.10);
    --r-btn:8px;
    --r-card:12px;
    --mask:rgba(17,24,39,.45);
    --mono:ui-monospace,"Cascadia Mono",Consolas,"Courier New",monospace;
  }
  *{margin:0;padding:0;box-sizing:border-box}
  body{
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
    background:var(--bg);color:var(--text);font-size:14px;line-height:1.6;min-height:100vh;
    display:flex;align-items:center;justify-content:center;padding:32px 16px;
  }
  .login-shell{
    width:100%;max-width:960px;background:var(--card);border-radius:16px;
    box-shadow:var(--shadow-md);overflow:hidden;display:grid;grid-template-columns:1fr 1fr;
    border:1px solid var(--border);
  }
  /* ============ 左侧品牌区 ============ */
  .brand-side{
    background:var(--sidebar);color:var(--on-dark);padding:48px 40px;
    display:flex;flex-direction:column;position:relative;overflow:hidden;
  }
  .brand-side::before{
    content:"";position:absolute;width:420px;height:420px;border-radius:50%;
    background:var(--brand);opacity:.14;top:-160px;right:-180px;
  }
  .brand-side::after{
    content:"";position:absolute;width:280px;height:280px;border-radius:50%;
    background:var(--brand);opacity:.10;bottom:-120px;left:-80px;
  }
  .brand-logo{display:flex;align-items:center;gap:12px;position:relative;z-index:1}
  .brand-logo .mark{
    width:44px;height:44px;border-radius:12px;background:var(--brand);
    display:flex;align-items:center;justify-content:center;color:var(--on-brand);
  }
  .brand-logo .name{font-size:22px;font-weight:800;letter-spacing:.5px}
  .brand-logo .name span{color:var(--on-dark-2);font-weight:400;font-size:13px;display:block;letter-spacing:0}
  .brand-pitch{margin-top:auto;position:relative;z-index:1}
  .brand-pitch h1{font-size:24px;font-weight:700;line-height:1.45;margin-bottom:12px}
  .brand-pitch p{color:var(--on-dark-2);font-size:13px;max-width:300px}
  .brand-feats{list-style:none;margin:24px 0;position:relative;z-index:1}
  .brand-feats li{
    display:flex;gap:10px;align-items:flex-start;color:var(--on-dark-2);
    font-size:13px;padding:7px 0;
  }
  .brand-feats li svg{flex:none;margin-top:3px;color:var(--brand)}
  .brand-ver{
    position:relative;z-index:1;font-size:12px;color:var(--on-dark-2);
    border-top:1px solid var(--sidebar-2);padding-top:16px;font-family:var(--mono);
  }
  /* ============ 右侧表单区 ============ */
  .form-side{padding:40px 44px 32px;display:flex;flex-direction:column}
  .form-side h2{font-size:20px;font-weight:700;margin-bottom:4px}
  .form-side .sub{color:var(--text-2);font-size:13px;margin-bottom:20px}
  /* License 状态条 */
  .lic-banner{
    display:flex;align-items:flex-start;gap:8px;border-radius:var(--r-btn);
    padding:10px 14px;font-size:13px;margin-bottom:20px;border:1px solid transparent;
  }
  .lic-banner svg{flex:none;margin-top:2px}
  .lic-banner.ok{background:var(--success-soft);border-color:var(--success-border);color:var(--success)}
  .lic-banner.warn{background:var(--warning-soft);border-color:var(--warning-border);color:var(--warning)}
  .lic-banner.expired{background:var(--danger-soft);border-color:var(--danger-border);color:var(--danger)}
  .lic-demo{margin:-12px 0 16px;display:flex;gap:8px;align-items:center}
  .lic-demo .lbl{font-size:12px;color:var(--text-3)}
  .lic-demo button{
    font-size:12px;padding:3px 10px;border-radius:999px;border:1px solid var(--border-strong);
    background:var(--card);color:var(--text-2);cursor:pointer;font-family:inherit;
  }
  .lic-demo button:hover{border-color:var(--brand);color:var(--brand)}
  .lic-demo button.on{background:var(--brand);border-color:var(--brand);color:var(--on-brand)}
  /* 表单 */
  .field{margin-bottom:18px}
  .field label{display:block;font-weight:600;font-size:13px;margin-bottom:6px}
  .field input[type=email],.field input[type=password],.field input[type=text]{
    width:100%;height:44px;border:1px solid var(--border-strong);border-radius:var(--r-btn);
    padding:0 12px;font-size:14px;font-family:inherit;color:var(--text);background:var(--card);
    transition:border-color .15s ease, box-shadow .15s ease;outline:none;
  }
  .field input:focus{border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-ring)}
  .field input.invalid{border-color:var(--danger)}
  .input-wrap{position:relative}
  .input-wrap input{padding-right:44px}
  .eye-btn{
    position:absolute;right:6px;top:6px;width:32px;height:32px;border:none;background:none;
    cursor:pointer;color:var(--text-2);border-radius:6px;display:flex;align-items:center;justify-content:center;
  }
  .eye-btn:hover{background:var(--bg);color:var(--text)}
  .err{font-size:12px;color:var(--danger);margin-top:6px;display:none}
  .err.show{display:block}
  .form-alert{
    display:none;align-items:flex-start;gap:8px;background:var(--danger-soft);
    border:1px solid var(--danger-border);color:var(--danger);border-radius:var(--r-btn);
    padding:10px 14px;font-size:13px;margin-bottom:16px;
  }
  .form-alert.show{display:flex}
  .row-between{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}
  .remember{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-2);cursor:pointer}
  .remember input{accent-color:var(--brand);width:16px;height:16px}
  .link{color:var(--brand);font-size:13px;text-decoration:none;cursor:pointer;background:none;border:none;font-family:inherit;padding:0}
  .link:hover{text-decoration:underline}
  .btn-login{
    width:100%;height:44px;border-radius:var(--r-btn);border:none;background:var(--brand);
    color:var(--on-brand);font-size:15px;font-weight:600;font-family:inherit;cursor:pointer;
    display:inline-flex;align-items:center;justify-content:center;gap:8px;transition:background .15s ease;
  }
  .btn-login:hover:not(:disabled){background:var(--brand-hover)}
  .btn-login:disabled{opacity:.6;cursor:not-allowed}
  .btn-login .spin{
    width:15px;height:15px;border-radius:50%;border:2px solid var(--brand-ring);
    border-top-color:currentColor;animation:spin .7s linear infinite;display:none;
  }
  .btn-login.loading .spin{display:inline-block}
  @keyframes spin{to{transform:rotate(360deg)}}
  .foot-note{
    margin-top:auto;padding-top:24px;border-top:1px solid var(--border);
    font-size:12px;color:var(--text-3);display:flex;align-items:center;gap:6px;flex-wrap:wrap;
  }
  .foot-note .dot-green{width:8px;height:8px;border-radius:50%;background:var(--success);flex:none}
  .foot-note .sep{color:var(--border-strong)}
  /* 忘记密码弹层 */
  .modal-mask{
    display:none;position:fixed;inset:0;background:var(--mask);z-index:50;
    align-items:center;justify-content:center;padding:16px;
  }
  .modal-mask.show{display:flex}
  .modal{
    background:var(--card);border-radius:var(--r-card);max-width:420px;width:100%;
    padding:24px;box-shadow:var(--shadow-md);animation:pop .2s ease;
  }
  @keyframes pop{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
  .modal h3{font-size:16px;margin-bottom:8px}
  .modal p{font-size:13px;color:var(--text-2);margin-bottom:16px}
  .modal .acts{display:flex;justify-content:flex-end;gap:8px}
  .btn-ghost{
    height:36px;padding:0 16px;border-radius:var(--r-btn);border:1px solid var(--border-strong);
    background:var(--card);color:var(--text);font-size:13px;font-weight:600;cursor:pointer;font-family:inherit;
  }
  .btn-ghost:hover{border-color:var(--brand);color:var(--brand)}
  .btn-mini{
    height:36px;padding:0 16px;border-radius:var(--r-btn);border:none;
    background:var(--brand);color:var(--on-brand);font-size:13px;font-weight:600;cursor:pointer;font-family:inherit;
  }
  .btn-mini:hover{background:var(--brand-hover)}
  /* 响应式 */
  @media (max-width:860px){
    .login-shell{grid-template-columns:1fr}
    .brand-side{padding:32px 28px}
    .brand-pitch{margin-top:24px}
    .form-side{padding:28px 24px}
  }