:root {
            --primary-bg: #ffffff;
            --secondary-bg: #f5f5f5;
            --primary-text: #333333;
            --secondary-text: #666666;
            --accent: #6200ea;
            --accent-hover: #3700b3;
            --shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
            --border: 1px solid #dddddd;
            --transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
            --font-size-base: 16px;
            --font-family: 'Arial', sans-serif;
        }

        [data-theme="light"] {
            /* Explicitly define for consistency */
            --primary-bg: #ffffff;
            --secondary-bg: #f5f5f5;
            --primary-text: #333333;
            --secondary-text: #666666;
            --accent: #6200ea;
            --accent-hover: #3700b3;
            --shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
            --border: 1px solid #dddddd;
        }

        [data-theme="dark"] {
            --primary-bg: #121212;
            --secondary-bg: #1e1e1e;
            --primary-text: #ffffff;
            --secondary-text: #bbbbbb;
            --accent: #bb86fc;
            --accent-hover: #3700b3;
            --shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
            --border: 1px solid #444444;
        }

        [data-theme="neon"] {
            --primary-bg: #0a0a23;
            --secondary-bg: #1b1b38;
            --primary-text: #00ffcc;
            --secondary-text: #ff00ff;
            --accent: #ff00ff;
            --accent-hover: #00ffcc;
            --shadow: 0 0 15px rgba(255, 0, 255, 0.6);
            --border: 1px solid #ff00ff;
        }

        [data-theme="ocean"] {
            --primary-bg: #e0f7fa;
            --secondary-bg: #b2ebf2;
            --primary-text: #006064;
            --secondary-text: #0097a7;
            --accent: #00bcd4;
            --accent-hover: #00838f;
            --shadow: 0 4px 8px rgba(0, 96, 100, 0.2);
            --border: 1px solid #00bcd4;
        }

        [data-theme="forest"] {
            --primary-bg: #e8f5e9;
            --secondary-bg: #c8e6c9;
            --primary-text: #1b5e20;
            --secondary-text: #388e3c;
            --accent: #4caf50;
            --accent-hover: #2e7d32;
            --shadow: 0 4px 8px rgba(27, 94, 32, 0.2);
            --border: 1px solid #4caf50;
        }

        [data-theme="sunset"] {
            --primary-bg: #fff3e0;
            --secondary-bg: #ffe0b2;
            --primary-text: #ef6c00;
            --secondary-text: #f57c00;
            --accent: #ff9800;
            --accent-hover: #ef6c00;
            --shadow: 0 4px 8px rgba(239, 108, 0, 0.2);
            --border: 1px solid #ff9800;
        }

        [data-theme="cyberpunk"] {
            --primary-bg: #121212;
            --secondary-bg: #1e1e1e;
            --primary-text: #ff4081;
            --secondary-text: #64ffda;
            --accent: #e040fb;
            --accent-hover: #aa00ff;
            --shadow: 0 0 20px rgba(224, 64, 251, 0.5);
            --border: 1px solid #e040fb;
            --font-family: 'Courier New', monospace;
        }

        [data-theme="vintage"] {
            --primary-bg: #faf0e6;
            --secondary-bg: #f5deb3;
            --primary-text: #8b4513;
            --secondary-text: #a0522d;
            --accent: #cd853f;
            --accent-hover: #8b4513;
            --shadow: 0 4px 8px rgba(139, 69, 19, 0.2);
            --border: 1px solid #cd853f;
            --font-family: 'Georgia', serif;
        }

        [data-theme="high-contrast"] {
            --primary-bg: #000000;
            --secondary-bg: #ffffff;
            --primary-text: #ffffff;
            --secondary-text: #000000;
            --accent: #ffff00;
            --accent-hover: #ff0000;
            --shadow: none;
            --border: 2px solid #ffffff;
            --font-size-base: 18px;
        }

        [data-theme="pastel"] {
            --primary-bg: #f3e5f5;
            --secondary-bg: #e1bee7;
            --primary-text: #6a1b9a;
            --secondary-text: #ab47bc;
            --accent: #ba68c8;
            --accent-hover: #7b1fa2;
            --shadow: 0 4px 8px rgba(106, 27, 154, 0.1);
            --border: 1px solid #ba68c8;
        }

        [data-theme="monochrome"] {
            --primary-bg: #e0e0e0;
            --secondary-bg: #d5d5d5;
            --primary-text: #333333;
            --secondary-text: #555555;
            --accent: #757575;
            --accent-hover: #616161;
            --shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
            --border: 1px solid #9e9e9e;
        }

        [data-theme="retro"] {
            --primary-bg: #f0f0f0;
            --secondary-bg: #d3d3d3;
            --primary-text: #2f4f4f;
            --secondary-text: #708090;
            --accent: #ff4040;
            --accent-hover: #cd2626;
            --shadow: 0 4px 8px rgba(47, 79, 79, 0.2);
            --border: 1px solid #708090;
            --font-family: 'Courier New', monospace;
        }

        [data-theme="futuristic"] {
            --primary-bg: #0d1b2a;
            --secondary-bg: #1b263b;
            --primary-text: #e0fbfc;
            --secondary-text: #90e0ef;
            --accent: #00b4d8;
            --accent-hover: #0077b6;
            --shadow: 0 0 12px rgba(0, 180, 216, 0.3);
            --border: 1px solid #00b4d8;
            --font-family: 'Verdana', sans-serif;
        }

        [data-theme="desert"] {
            --primary-bg: #f4a261;
            --secondary-bg: #e76f51;
            --primary-text: #2a1d0f;
            --secondary-text: #5c4033;
            --accent: #e9c46a;
            --accent-hover: #cb997e;
            --shadow: 0 4px 8px rgba(42, 29, 15, 0.2);
            --border: 1px solid #e9c46a;
        }

        [data-theme="lavender"] {
            --primary-bg: #e6e6fa;
            --secondary-bg: #dcd0ff;
            --primary-text: #483d8b;
            --secondary-text: #6a5acd;
            --accent: #7b68ee;
            --accent-hover: #4b0082;
            --shadow: 0 4px 8px rgba(72, 61, 139, 0.2);
            --border: 1px solid #7b68ee;
        }

        [data-theme="candy"] {
            --primary-bg: #ffe4e1;
            --secondary-bg: #ffb6c1;
            --primary-text: #c71585;
            --secondary-text: #ff69b4;
            --accent: #ff1493;
            --accent-hover: #c71585;
            --shadow: 0 4px 8px rgba(199, 21, 133, 0.2);
            --border: 1px solid #ff1493;
        }

        [data-theme="arctic"] {
            --primary-bg: #f0f8ff;
            --secondary-bg: #e6f3ff;
            --primary-text: #191970;
            --secondary-text: #4169e1;
            --accent: #4682b4;
            --accent-hover: #2f4f4f;
            --shadow: 0 4px 8px rgba(25, 25, 112, 0.2);
            --border: 1px solid #4682b4;
        }

        [data-theme="minimal"] {
            --primary-bg: #ffffff;
            --secondary-bg: #fafafa;
            --primary-text: #212121;
            --secondary-text: #424242;
            --accent: #9e9e9e;
            --accent-hover: #616161;
            --shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
            --border: 1px solid #e0e0e0;
            --font-family: 'Helvetica', sans-serif;
        }

        [data-theme="coffee"] {
            --primary-bg: #f5f5dc;
            --secondary-bg: #deb887;
            --primary-text: #4b2e1e;
            --secondary-text: #6f4e37;
            --accent: #8b5a2b;
            --accent-hover: #5c4033;
            --shadow: 0 4px 8px rgba(75, 46, 30, 0.2);
            --border: 1px solid #8b5a2b;
        }

        [data-theme="galaxy"] {
            --primary-bg: #0b0b3b;
            --secondary-bg: #1c2526;
            --primary-text: #e5e5ff;
            --secondary-text: #b8b8d8;
            --accent: #483d8b;
            --accent-hover: #2e2e7a;
            --shadow: 0 0 15px rgba(72, 61, 139, 0.4);
            --border: 1px solid #483d8b;
            --font-family: 'Verdana', sans-serif;
        }

        [data-theme="coral"] {
            --primary-bg: #ff7f50;
            --secondary-bg: #ff6347;
            --primary-text: #3c2f2f;
            --secondary-text: #5c4033;
            --accent: #ff4500;
            --accent-hover: #d22d00;
            --shadow: 0 4px 8px rgba(60, 47, 47, 0.2);
            --border: 1px solid #ff4500;
        }

        [data-theme="emerald"] {
            --primary-bg: #e0f2e9;
            --secondary-bg: #b7e4c7;
            --primary-text: #1b4332;
            --secondary-text: #2d6a4f;
            --accent: #40916c;
            --accent-hover: #2d572c;
            --shadow: 0 4px 8px rgba(27, 67, 50, 0.2);
            --border: 1px solid #40916c;
        }

        body {
            margin: 0;
            padding: 0;
            min-height: 100vh;
            font-family: var(--font-family);
            font-size: var(--font-size-base);
            background-color: var(--primary-bg);
            color: var(--primary-text);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: flex-start;
        }

        .container {
            text-align: center;
            padding: 2rem 1rem;
            width: 100%;
            max-width: 90vw;
            box-sizing: border-box;
            flex: 1;
        }

        .card {
            background-color: var(--secondary-bg);
            padding: 1.5rem;
            border-radius: 15px; /* More rounded for nicer look */
            box-shadow: var(--shadow);
            margin: 1rem 0;
            transition: var(--transition);
            border: var(--border);
            position: relative;
            overflow: hidden;
        }

        .card::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
            opacity: 0;
            transition: opacity 0.5s;
        }

        .card:hover::before {
            opacity: 1;
        }

        .card:hover {
            transform: scale(1.03) rotate(1deg); /* Slight rotation for dynamic feel */
            box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
        }

        .theme-controls {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 1.5rem; /* Increased gap for better spacing */
            margin: 1.5rem 0;
        }

        .theme-label {
            font-size: calc(var(--font-size-base) * 1.1);
            color: var(--secondary-text);
        }

        .theme-dropdown {
            background-color: var(--accent);
            color: var(--primary-bg);
            border: none;
            padding: 0.8rem 1rem;
            border-radius: 8px; /* Slightly more rounded */
            font-size: calc(var(--font-size-base) * 0.9);
            cursor: pointer;
            transition: var(--transition);
            width: 100%;
            max-width: 250px; /* Wider for better usability */
            box-sizing: border-box;
            appearance: none; /* Remove default arrow */
            background-image: linear-gradient(45deg, var(--accent), var(--accent-hover)); /* Gradient for nicer look */
        }

        .theme-dropdown:hover, .theme-dropdown:focus {
            background-color: var(--accent-hover);
            outline: none;
            box-shadow: 0 0 10px var(--accent);
        }

        .theme-selector {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); /* Larger min width */
            gap: 1rem; /* Increased gap */
            width: 100%;
            justify-items: center;
        }

        .theme-button {
            background-color: var(--accent);
            color: var(--primary-bg);
            border: none;
            padding: 0.7rem 1.2rem; /* Slightly larger padding */
            border-radius: 8px;
            cursor: pointer;
            transition: var(--transition);
            font-size: calc(var(--font-size-base) * 0.9);
            font-weight: bold;
            width: 100%;
            text-align: center;
            touch-action: manipulation;
            position: relative;
            overflow: hidden;
        }

        .theme-button::after {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 0;
            height: 0;
            background: rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            transform: translate(-50%, -50%);
            transition: width 0.6s ease, height 0.6s ease;
        }

        .theme-button:hover::after,
        .theme-button:focus::after {
            width: 300%;
            height: 300%;
        }

        .theme-button:hover, .theme-button:focus {
            background-color: var(--accent-hover);
            transform: translateY(-3px) scale(1.05);
            outline: none;
        }

        .cycle-button {
            background-color: var(--accent);
            color: var(--primary-bg);
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: 30px; /* More pill-shaped */
            cursor: pointer;
            transition: var(--transition);
            font-size: calc(var(--font-size-base) * 0.9);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            width: 100%;
            max-width: 220px;
            touch-action: manipulation;
            background-image: linear-gradient(45deg, var(--accent), var(--accent-hover));
        }

        .cycle-button:hover, .cycle-button:focus {
            background-color: var(--accent-hover);
            transform: rotate(5deg) scale(1.1); /* Enhanced animation */
            outline: none;
            box-shadow: 0 0 15px var(--accent);
        }

        .cycle-button i {
            font-size: calc(var(--font-size-base) * 1.2);
            transition: transform 0.4s;
        }

        .cycle-button:hover i {
            transform: rotate(360deg);
        }

        h1 {
            font-size: clamp(1.8rem, 7vw, 2.5rem); /* Larger for impact */
            margin: 0.5rem 0;
            text-shadow: 1px 1px 2px var(--secondary-text);
        }

        p {
            font-size: clamp(1rem, 4.5vw, 1.1rem);
            line-height: 1.6;
        }

        .footer {
            background-color: var(--secondary-bg);
            color: var(--secondary-text);
            text-align: center;
            padding: 1rem;
            width: 100%;
            position: fixed;
            bottom: 0;
            left: 0;
            box-shadow: var(--shadow);
            border-top: var(--border);
            font-family: 'Courier New', monospace; /* Futuristic font */
            z-index: 1000;
        }

        .footer p {
            margin: 0;
            letter-spacing: 2px;
            text-transform: uppercase;
            animation: glow 2s ease-in-out infinite;
        }

        @keyframes glow {
            0% { text-shadow: 0 0 5px var(--accent), 0 0 10px var(--accent-hover); }
            50% { text-shadow: 0 0 10px var(--accent), 0 0 20px var(--accent-hover), 0 0 30px var(--accent); }
            100% { text-shadow: 0 0 5px var(--accent), 0 0 10px var(--accent-hover); }
        }
   

        @media (max-width: 600px) {
            .container{
                margin-bottom: 2rem;
            }
            :root {
                --font-size-base: 14px;
            }

            .container {
                padding: 1rem 0.5rem;
            }

            .card {
                padding: 1rem;
                margin: 0.5rem 0;
            }

            .theme-dropdown {
                padding: 0.6rem;
                font-size: calc(var(--font-size-base) * 0.9);
                max-width: 100%;
            }

            .theme-button {
                padding: 0.5rem;
                font-size: calc(var(--font-size-base) * 0.85);
            }

            .cycle-button {
                padding: 0.6rem 1rem;
                font-size: calc(var(--font-size-base) * 0.9);
                max-width: 100%;
            }

            .footer {
                padding: 0.8rem;
                font-size: calc(var(--font-size-base) * 0.9);
            }
        }

        @media (prefers-color-scheme: dark) {
            :root:not([data-theme]) {
                --primary-bg: #121212;
                --secondary-bg: #1e1e1e;
                --primary-text: #ffffff;
                --secondary-text: #bbbbbb;
                --accent: #bb86fc;
                --accent-hover: #3700b3;
                --shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
                --border: 1px solid #444444;
            }
        }