body {
            font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #0f3460, #16213e);
            margin: 0;
        }
        .login-container {
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }
        .login-box {
            background: #fff;
            padding: 40px;
            border-radius: 12px;
            box-shadow: 0 8px 25px rgba(0,0,0,0.2);
            width: 380px;
            text-align: center;

        }
        .logo {
            margin-bottom: 20px;
        }
        .logo img {
            max-width: 325px;
            display: block;
            margin: 0 auto;
        }
        .login-header h1 {
            margin: 10px 0;
            font-size: 24px;
            color: #0f3460;
            font-weight: 600;
        }
        .subtitle {
            color: #555;
            font-size: 15px;
            margin-bottom: 25px;
        }
        .form-group {
            text-align: left;
            margin-bottom: 18px;
        }
        .form-group label {
            font-weight: 600;
            display: block;
            margin-bottom: 6px;
            color: #333;
        }
        .form-group input {
            width: 100%;
            padding: 12px;
            border-radius: 8px;
            border: 1px solid #ccc;
            transition: border-color 0.3s;
        }
        .form-group input:focus {
            border-color: #0f3460;
            outline: none;
        }
        .btn-login {
            width: 100%;
            padding: 14px;
            background: #0f3460;
            color: #fff;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            transition: background 0.3s;
        }
        .btn-login:hover {
            background: #1a4a80;
        }
        .error-message {
            background: #ffe0e0;
            color: #b00000;
            padding: 12px;
            border-radius: 8px;
            margin-bottom: 18px;
            text-align: center;
            font-weight: 500;
        }
        .login-footer {
            margin-top: 25px;
            font-size: 13px;
            color: #666;
        }
        .login-footer a {
            color: #0f3460;
            text-decoration: none;
            font-weight: 600;
        }
        .login-footer a:hover {
            text-decoration: underline;
        }
        .version {
            margin-top: 8px;
            font-size: 12px;
            color: #999;
        }