* {
            transition: background-color 0.5s cubic-bezier(0.4, 0, 0.2, 1), 
                        color 0.5s cubic-bezier(0.4, 0, 0.2, 1), 
                        border-color 0.5s cubic-bezier(0.4, 0, 0.2, 1);
        }

        body {
            font-family: system-ui, sans-serif;
            background-color: var(--bg);
            color: var(--text);
            line-height: 1.6;
            margin: 0;
            overflow-x: hidden; 
        }

        /* VARIABLES */

        :root {
            --bg: #ffffff;
            --text: #1a1a1a;
            --primary: #2563eb;
            --card: #f8fafc;
            --border-color: #dddddd;
        }

        [data-theme="dark"] {
            --bg: #0f172a;
            --text: #f8fafc;
            --primary: #3b82f6;
            --card: #1e293b;
            --border-color: #334155;
        }

        /* Global transitions */

        * {
            transition: background-color 0.5s cubic-bezier(0.4, 0, 0.2, 1), 
                        color 0.5s cubic-bezier(0.4, 0, 0.2, 1), 
                        border-color 0.5s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* Core styles */

        body {
            font-family: system-ui, sans-serif;
            background-color: var(--bg);
            color: var(--text);
            line-height: 1.6;
            margin: 0;
        }

        .container {
            max-width: 1000px;
            margin: 0 auto;
            padding: 2rem;
        }

        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 2rem;
            border-bottom: 1px solid var(--border-color);
        }

        nav p {
            cursor: default;
        }

        nav a {
            font-weight: bold;
        }

        nav a:hover {
            color: var(--primary);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 20px;
        }

        .nav-links a {
            text-decoration: none;
            color: var(--text);
            font-weight: 500;
        }

        /* Hero section */

        .hero {
            padding: 4rem 0;
        }

        h1 { font-size: 2.5rem; margin-bottom: 10px; }
        
        .btn {
            background: var(--primary);
            color: white !important;
            padding: 10px 20px;
            text-decoration: none;
            border-radius: 5px;
            display: inline-block;
            border: none;
            cursor: pointer;
            margin-top: 10px;
            transition: all 200ms ease-in-out;
        }

        .btn:hover {
            opacity: 0.7;
        }

        /* Works section grid */

        .grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr); 
            gap: 20px;
            margin-top: 2rem;
        }

        .card {
            background: var(--card);
            padding: 20px;
            border-radius: 8px;
            border: 1px solid var(--border-color);
        }

        /* Theme toggle btn */

        #theme-toggle {
            background: none;
            border: 1px solid var(--text);
            color: var(--text);
            padding: 5px 10px;
            cursor: pointer;
            border-radius: 4px;
        }

        /* Footer */

        footer {
            text-align: center;
            padding: 3rem 1rem;
            margin-top: 4rem;
            border-top: 1px solid var(--border-color);
            font-size: 0.9rem;
            opacity: 0.8;
        }

        /* Mobile Responsive */

        @media (max-width: 600px) {
            .grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 520px) {
            .hero h1 {
                font-size: 2rem;
            }
        }

        @media (max-width: 430px) {
            .hero h1 {
                font-size: 1.75rem;
            }

            nav div a {
                font-size: 15px;
            }
        }

        @media (max-width: 400px) {
            .hero h1 {
                font-size: 1.5rem;
            }

            .hero p {
                font-size: 1rem;
            }
        }