        body {
            margin: 0;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            background: linear-gradient(135deg, #1e1e2f 0%, #2a2a4e 100%);
            font-family: 'Segoe UI', sans-serif;
            color: #e0e0e0;
            user-select: none;
            overflow: hidden;
            position: relative;
        }
        .auth-box {
            background: rgba(40, 40, 70, 0.9);
            padding: 30px;
            border-radius: 15px;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
            text-align: center;
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.1);
            max-width: 90%;
            width: 350px;
        }
        input {
            padding: 12px;
            margin: 15px 0;
            width: 100%;
            max-width: 220px;
            border: none;
            border-radius: 5px;
            background: #3a3a5a;
            color: #e0e0e0;
            font-size: 16px;
            box-sizing: border-box;
        }
        .button-container {
            display: flex;
            gap: 10px;
            justify-content: center;
            align-items: center;
        }
        button {
            padding: 12px 0;
            border: none;
            border-radius: 5px;
            background: linear-gradient(90deg, #6a5af9 0%, #a855f7 100%);
            color: white;
            font-size: 16px;
            cursor: pointer;
            transition: transform 0.1s, background 0.3s;
            width: 100px;
            line-height: 1;
        }
        button:hover {
            transform: scale(1.05);
            background: linear-gradient(90deg, #a855f7 0%, #6a5af9 100%);
        }
        #timer {
            position: absolute;
            top: 20px;
            right: 20px;
            font-size: 18px;
            color: #a855f7;
            background: rgba(40, 40, 70, 0.8);
            padding: 5px 10px;
            border-radius: 5px;
        }
        #notification {
            position: absolute;
            top: 70px;
            left: 50%;
            transform: translateX(-50%);
            color: white;
            padding: 10px 20px;
            border-radius: 5px;
            display: none;
            font-size: 14px;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
        }
        h2 {
            margin: 0 0 20px 0;
            font-size: 24px;
            color: #a855f7;
        }
        p {
            font-size: 14px;
            color: #b0b0c0;
            white-space: nowrap; /* ป้องกันการตัดบรรทัด */
        }
        #logo {
            position: absolute;
            top: 20px;
            left: 20px;
            font-size: 20px;
            font-weight: bold;
            color: #a855f7;
        }
        footer {
            position: absolute;
            bottom: 10px;
            left: 50%;
            transform: translateX(-50%);
            font-size: 12px;
            color: #b0b0c0;
        }
        #contextMenu {
            position: absolute;
            background: #333;
            border: 1px solid #555;
            border-radius: 5px;
            padding: 5px 0;
            display: none;
            z-index: 1000;
        }
        #contextMenu div {
            padding: 8px 15px;
            color: #e0e0e0;
            cursor: pointer;
        }
        #contextMenu div.disabled {
            color: #666;
            cursor: not-allowed;
        }
        #contextMenu div:not(.disabled):hover {
            background: #555;
        }
        #expiredMessage {
            font-size: 18px;
            color: #FF4444;
            text-align: center;
        }

        /* Responsive Design */
        @media (max-width: 600px) {
            .auth-box {
                padding: 20px;
                width: 90%;
            }
            input {
                max-width: 100%;
                font-size: 14px;
            }
            button {
                width: 80px;
                font-size: 14px;
                padding: 10px 0;
            }
            h2 {
                font-size: 20px;
            }
            #timer {
                font-size: 16px;
                top: 10px;
                right: 10px;
            }
            #notification {
                top: 60px;
                font-size: 12px;
                padding: 8px 15px;
            }
            #logo {
                font-size: 16px;
                top: 10px;
                left: 10px;
            }
            footer {
                font-size: 10px;
                bottom: 5px;
            }
            p {
                font-size: 12px;
            }
        }