:root {
            --bg-color: #f0f4f8;
            --text-color: #2c3e50;
            --card-bg: #ffffff;
            --accent-color: #3498db;
            --accent-hover: #2980b9;
            --success-color: #2ecc71;
            --warning-color: #f39c12;
            --error-color: #e74c3c;
        }

        .dark-mode {
            --bg-color: #1a1a2e;
            --text-color: #e0e0e0;
            --card-bg: #16213e;
            --accent-color: #4a69bd;
            --accent-hover: #1e3799;
        }

        * {
            box-sizing: border-box;
            transition: all 0.3s ease;
        }

        body {
            font-family: 'Poppins', sans-serif;
            background-color: var(--bg-color);
            color: var(--text-color);
            margin: 0;
            padding: 0;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 2rem;
        }

        h1, h2 {
            text-align: center;
            margin-bottom: 2rem;
            font-weight: 600;
        }

        h1 {
            font-size: 2.5rem;
            color: var(--accent-color);
        }

        .card {
            background-color: var(--card-bg);
            border-radius: 12px;
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
            padding: 2rem;
            margin-bottom: 2rem;
            transform: translateY(0);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }

        .ip-address {
            font-size: 2.5rem;
            font-weight: bold;
            text-align: center;
            color: var(--accent-color);
            margin-bottom: 1rem;
        }

        .info-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
        }

        .info-item {
            display: flex;
            flex-direction: column;
            background-color: rgba(255, 255, 255, 0.05);
            padding: 1rem;
            border-radius: 8px;
            transition: background-color 0.3s ease;
        }

        .info-item:hover {
            background-color: rgba(255, 255, 255, 0.1);
        }

        .info-label {
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--accent-color);
        }

        #map {
            height: 400px;
            width: 100%;
            border-radius: 12px;
            overflow: hidden;
        }

        .speed-test {
            display: flex;
            justify-content: space-between;
            margin-top: 1.5rem;
        }

        .speed-item {
            text-align: center;
            flex: 1;
            padding: 1rem;
            background-color: rgba(255, 255, 255, 0.05);
            border-radius: 8px;
            transition: transform 0.3s ease;
        }

        .speed-item:hover {
            transform: scale(1.05);
        }

        .speed-value {
            font-size: 2rem;
            font-weight: bold;
            color: var(--accent-color);
            margin-bottom: 0.5rem;
        }

        .toggle-container {
            display: flex;
            justify-content: flex-end;
            margin-bottom: 1.5rem;
        }

        .toggle-switch {
            position: relative;
            display: inline-block;
            width: 60px;
            height: 34px;
        }

        .toggle-switch input {
            opacity: 0;
            width: 0;
            height: 0;
        }

        .slider {
            position: absolute;
            cursor: pointer;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: #ccc;
            transition: .4s;
            border-radius: 34px;
        }

        .slider:before {
            position: absolute;
            content: "";
            height: 26px;
            width: 26px;
            left: 4px;
            bottom: 4px;
            background-color: white;
            transition: .4s;
            border-radius: 50%;
        }

        input:checked + .slider {
            background-color: var(--accent-color);
        }

        input:checked + .slider:before {
            transform: translateX(26px);
        }

        #startSpeedTest {
            display: block;
            width: 100%;
            padding: 1rem;
            font-size: 1.1rem;
            font-weight: 600;
            color: #fff;
            background-color: var(--accent-color);
            border: none;
            border-radius: 8px;
            cursor: pointer;
            transition: background-color 0.3s ease, transform 0.3s ease;
            outline: none;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        #startSpeedTest:hover {
            background-color: var(--accent-hover);
            transform: translateY(-2px);
        }

        #startSpeedTest:active {
            transform: translateY(1px);
        }

        #startSpeedTest:disabled {
            background-color: #ccc;
            cursor: not-allowed;
        }

        @keyframes pulse {
            0% {
                transform: scale(1);
            }
            50% {
                transform: scale(1.05);
            }
            100% {
                transform: scale(1);
            }
        }

        .pulse {
            animation: pulse 2s infinite;
        }

        @media (max-width: 768px) {
            .container {
                padding: 1rem;
            }

            .ip-address {
                font-size: 2rem;
            }

            .info-grid {
                grid-template-columns: 1fr;
            }

            .speed-test {
                flex-direction: column;
            }

            .speed-item {
                margin-bottom: 1rem;
            }
        }

        .info-item::before {
            font-family: 'Font Awesome 5 Free';
            font-weight: 900;
            margin-right: 0.5rem;
            color: var(--accent-color);
        }

        .info-item:nth-child(1)::before { content: '\f0ac'; } /* Globe */
        .info-item:nth-child(2)::before { content: '\f3c5'; } /* Map Marker */
        .info-item:nth-child(3)::before { content: '\f64f'; } /* City */
        .info-item:nth-child(4)::before { content: '\f0b1'; } /* Briefcase */
        .info-item:nth-child(5)::before { content: '\f3c5'; } /* Map Marker */
        .info-item:nth-child(6)::before { content: '\f3c5'; } /* Map Marker */
        .info-item:nth-child(7)::before { content: '\f017'; } /* Clock */

        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateY(50px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .card {
            animation: slideIn 0.5s ease forwards;
        }

        .card:nth-child(2) { animation-delay: 0.1s; }
        .card:nth-child(3) { animation-delay: 0.2s; }
        .card:nth-child(4) { animation-delay: 0.3s; }
        .card:nth-child(5) { animation-delay: 0.4s; }