* { box-sizing: border-box; }

    body {
      margin: 0;
      min-height: 100vh;
      display: grid;
      place-items: center;
      padding: 20px;
      font-family: Arial, sans-serif;
      background: linear-gradient(135deg, #101d35, #234a70);
      color: #17243b;
    }

    .login-card {
      width: 100%;
      max-width: 420px;
      padding: 38px;
      border-radius: 18px;
      background: white;
      box-shadow: 0 20px 55px rgba(0,0,0,.25);
    }

    .brand {
      text-align: center;
      margin-bottom: 30px;
    }

    .brand h1 {
      margin: 0 0 8px;
      color: #173a64;
      font-size: 28px;
    }

    .brand p {
      color: #64748b;
      font-size: 14px;
    }

    label {
      display: block;
      margin: 18px 0 7px;
      font-weight: 600;
      font-size: 14px;
    }

    input {
      width: 100%;
      padding: 13px;
      border: 1px solid #cbd5e1;
      border-radius: 9px;
      font-size: 15px;
    }

    input:focus {
      outline: 2px solid #2563eb;
    }

    button {
      width: 100%;
      margin-top: 24px;
      padding: 14px;
      border: 0;
      border-radius: 9px;
      background: #1763aa;
      color: white;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
    }

    button:disabled {
      opacity: .6;
      cursor: wait;
    }

    .error {
      min-height: 20px;
      margin-top: 14px;
      color: #b91c1c;
      font-size: 14px;
      text-align: center;
    }

    .footer {
      margin-top: 25px;
      color: #64748b;
      font-size: 12px;
      text-align: center;
    }