* {
            box-sizing: border-box;
        }

        body {
            margin: 0;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;

            font-family: Arial, sans-serif;
            background: #f5f5f5;
        }

        .login-container {
            width: 100%;
            max-width: 400px;
            padding: 35px;

            background: #fff;
            border-radius: 18px;

            box-shadow: 0 10px 35px rgba(0, 0, 0, 0.10);
        }

        .login-container h1 {
            margin: 0 0 8px;
            text-align: center;
        }

        .login-container p {
            margin: 0 0 25px;
            text-align: center;
            color: #777;
        }

        .login-container label {
            display: block;
            margin-bottom: 7px;
            font-weight: 600;
        }

        .login-container input {
            width: 100%;
            padding: 13px 14px;
            margin-bottom: 18px;

            border: 1px solid #ddd;
            border-radius: 10px;

            font-size: 15px;
            outline: none;
        }

        .login-container input:focus {
            border-color: #111;
        }

        .login-container button {
            width: 100%;
            padding: 14px;

            border: 0;
            border-radius: 10px;

            background: #000;
            color: #fff;

            font-size: 16px;
            font-weight: 600;

            cursor: pointer;
        }

        .login-container button:hover {
            opacity: 0.9;
        }

        .error {
            margin-bottom: 18px;
            padding: 12px;

            border-radius: 8px;

            background: #ffe5e5;
            color: #b00000;

            text-align: center;
        }