:root {
            --primary-color: #111;
            --secondary-color: #f2f2f2;
            --accent-color: #ffb400;
            --nav-bg: #2b2a2a;
            --card-bg: #1e1e1e;
        }

        .light-theme {
            --primary-color: #d5d5d5;
            --secondary-color: #222;
            --card-bg: #f5f5f5;
        }

        * {
            padding: 0;
            margin: 0;
            box-sizing: border-box;
            text-decoration: none;
        }

        body {
            font-family: 'Poppins', sans-serif;
            background-color: var(--primary-color);
            color: var(--secondary-color);
            transition: background-color 0.3s ease, color 0.3s ease;
            line-height: 1.6;
        }

        .container {
            max-width: 1200px;
            width: 95%;
            margin: 0 auto;
            padding: 2rem 0;
        }

        .toggle {
            position: fixed;
            right: 4%;
            top: 2rem;
            width: 50px;
            height: 50px;
            background-color: var(--nav-bg);
            border-radius: 50%;
            border: none;
            color: #fff;
            font-size: 1.5rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 1000;
            transition: background-color 0.3s ease;
        }

        .toggle:hover {
            background-color: var(--accent-color);
        }

        .header-content {
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        .about-hero {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 4rem;
            padding-top: 2rem;
        }

        .about-text {
            max-width: 600px;
        }

        .about-text h1 {
            font-size: 3.5rem;
            color: var(--accent-color);
            margin-bottom: 1.5rem;
            position: relative;
            display: inline-block;
        }

        .about-text h1::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 0;
            width: 100%;
            height: 4px;
            background-color: #ff3b30;
            border-radius: 2px;
        }

        .about-text p {
            font-size: 1.1rem;
            margin-bottom: 2rem;
            line-height: 1.8;
        }

        .skills-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin-bottom: 4rem;
        }

        .skill-category {
            background-color: var(--card-bg);
            padding: 2rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }

        .skill-category h2 {
            color: var(--accent-color);
            margin-bottom: 1.5rem;
            font-size: 1.8rem;
            display: flex;
            align-items: center;
        }

        .skill-category h2 i {
            margin-right: 10px;
        }

        .skill-item {
            margin-bottom: 1.5rem;
        }

        .skill-name {
            display: flex;
            justify-content: space-between;
            margin-bottom: 0.5rem;
        }

        .skill-bar {
            height: 10px;
            background-color: #444;
            border-radius: 5px;
            overflow: hidden;
        }

        .light-theme .skill-bar {
            background-color: #ddd;
        }

        .skill-progress {
            height: 100%;
            background-color: var(--accent-color);
            border-radius: 5px;
        }

        .experience {
            margin-bottom: 4rem;
        }

        .experience h2 {
            color: var(--accent-color);
            margin-bottom: 2rem;
            font-size: 2rem;
        }

        .timeline {
            position: relative;
            max-width: 800px;
            margin: 0 auto;
        }

        .timeline::after {
            content: '';
            position: absolute;
            width: 6px;
            background-color: var(--accent-color);
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -3px;
        }

        .timeline-item {
            padding: 10px 40px;
            position: relative;
            width: 50%;
            box-sizing: border-box;
        }

        .timeline-item:nth-child(odd) {
            left: 0;
        }

        .timeline-item:nth-child(even) {
            left: 50%;
        }

        .timeline-content {
            padding: 20px;
            background-color: var(--card-bg);
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }

        .timeline-content h3 {
            color: var(--accent-color);
            margin-bottom: 0.5rem;
        }

        .timeline-date {
            font-weight: bold;
            margin-bottom: 0.5rem;
            color: var(--accent-color);
        }

        .timeline-item::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            background-color: var(--accent-color);
            border: 4px solid var(--nav-bg);
            border-radius: 50%;
            top: 20px;
            z-index: 1;
        }

        .timeline-item:nth-child(odd)::after {
            right: -10px;
        }

        .timeline-item:nth-child(even)::after {
            left: -10px;
        }

        .navigation {
            display: flex;
            justify-content: center;
            margin-top: 2rem;
        }

        .nav {
            display: flex;
            padding: 0.8rem;
            background-color: var(--nav-bg);
            border-radius: 35px;
        }

        .navigation .nav li {
            list-style: none;
        }

        .nav a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 50px;
            height: 50px;
            margin: 0 10px;
            background-color: var(--nav-bg);
            border-radius: 50%;
            color: #fff;
            font-size: 1.2rem;
            transition: all 0.3s ease;
        }

        .nav a.active,
        .nav a:hover {
            background-color: var(--accent-color);
            color: var(--secondary-color);
        }

        @media screen and (max-width: 768px) {
            .about-hero {
                flex-direction: column;
                text-align: center;
            }
            
            .about-text h1 {
                font-size: 2.5rem;
            }
            
            .timeline::after {
                left: 31px;
            }
            
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
            }
            
            .timeline-item:nth-child(even) {
                left: 0;
            }
            
            .timeline-item::after {
                left: 21px;
            }
            
            .timeline-item:nth-child(odd)::after {
                right: auto;
            }
        }