body {
            font-family: 'Helvetica Neue', Arial, sans-serif;
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            background-color: #000;
            overflow: hidden;
        }

        #starfield {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 0;
        }

        .login-container {
            position: relative;
            z-index: 1;
            width: 540px;
            padding: 60px 52px;
        }

        .header {
            text-align: center;
            margin-bottom: 48px;
        }

        h1 {
            font-size: 42px;
            margin: 0;
            font-weight: bold;
            letter-spacing: 2px;
            background: linear-gradient(90deg, #ffd700, #ffec8b, #ffd700, #daa520, #ffd700);
            background-size: 200% auto;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            animation: shimmer 3s linear infinite;
        }

        @keyframes shimmer {
            0% { background-position: -200% center; }
            100% { background-position: 200% center; }
        }

        .subtitle {
            color: #999;
            font-size: 18px;
            margin-top: 12px;
        }

        .form-group {
            margin-bottom: 30px;
            display: flex;
            align-items: center;
            gap: 18px;
        }

        label {
            color: #ffffff;
            font-weight: 500;
            font-size: 20px;
            white-space: nowrap;
            min-width: 105px;
        }

        input[type="text"],
        input[type="password"] {
            flex: 1;
            padding: 14px 16px;
            border: 1px solid #ffffff;
            border-radius: 4px;
            box-sizing: border-box;
            font-size: 20px;
            background-color: #ffffff;
            color: #000000;
        }

        input[type="text"]::placeholder,
        input[type="password"]::placeholder {
            color: #666;
        }

        input[type="text"]:focus,
        input[type="password"]:focus {
            outline: none;
            border-color: #ffd700;
        }

        .agree-group {
            margin-bottom: 33px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
        }

        .agree-group input[type="checkbox"] {
            width: 20px;
            height: 20px;
            cursor: pointer;
            accent-color: #ffd700;
        }

        .agree-group label {
            min-width: auto;
            font-size: 20px;
            cursor: pointer;
        }

        .agree-group a {
            color: #ffd700;
            text-decoration: underline;
        }

        .agree-group a:hover {
            color: #ffec8b;
        }

        button {
            color: #0a0a1a;
            border: none;
            border-radius: 4px;
            padding: 16px 0;
            width: 100%;
            font-size: 22px;
            font-weight: bold;
            cursor: pointer;
            transition: background-color 0.3s;
            background-color: #ffd700;
        }

        button:hover {
            background-color: #ffec8b;
        }

        button:disabled {
            background-color: #555;
            color: #999;
            cursor: not-allowed;
        }

        .error-message {
            color: #ff3860;
            font-size: 14px;
            margin-top: 5px;
            text-align: center;
            margin-bottom: 15px;
            display: none;
        }

        .mobile-warning {
            color: white;
            width: 100vw;
            height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5em;
            text-align: center;
            background-color: #0a0a1a;
        }