:root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --secondary: #64748b;
            --dark: #1e293b;
            --light: #f8fafc;
            --gray: #e2e8f0;
            --dark-gray: #94a3b8;
        }

        [data-theme="dark"] {
            --primary: #3b82f6;
            --primary-dark: #2563eb;
            --secondary: #94a3b8;
            --dark: #f8fafc;
            --light: #1e293b;
            --gray: #334155;
            --dark-gray: #64748b;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            transition: background-color 0.3s, color 0.3s;
        }

        body {
            font-family: 'Poppins', sans-serif;
            background-color: var(--light);
            color: var(--dark);
            line-height: 1.6;
            overflow-x: hidden;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        section {
            padding: 80px 0;
        }

        h1, h2, h3, h4 {
            font-weight: 600;
            line-height: 1.2;
        }

        h1 {
            font-size: 3rem;
        }

        h2 {
            font-size: 2.5rem;
            margin-bottom: 40px;
            position: relative;
            display: inline-block;
        }

        h2::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 0;
            width: 60px;
            height: 4px;
            background-color: var(--primary);
            border-radius: 2px;
        }

        h3 {
            font-size: 1.5rem;
            margin-bottom: 15px;
        }

        p {
            color: var(--secondary);
            margin-bottom: 15px;
        }

        a {
            text-decoration: none;
            color: var(--primary);
        }

        .btn {
            display: inline-block;
            padding: 12px 24px;
            background-color: var(--primary);
            color: white;
            border-radius: 6px;
            font-weight: 500;
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
            font-size: 1rem;
        }

        .btn:hover {
            background-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }

        .btn-outline {
            background-color: transparent;
            border: 2px solid var(--primary);
            color: var(--primary);
        }

        .btn-outline:hover {
            background-color: var(--primary);
            color: white;
        }

        /* Header */
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            padding: 20px 0;
            z-index: 1000;
            background-color: rgba(248, 250, 252, 0.9);
        }

        [data-theme="dark"] header {
            background-color: rgba(30, 41, 59, 0.9);
        }

        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary);
        }

        nav ul {
            display: flex;
            list-style: none;
        }

        nav ul li {
            margin-left: 30px;
        }

        nav ul li a {
            color: var(--dark);
            font-weight: 600;
            transition: color 0.3s;
        }

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

        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--dark);
            cursor: pointer;
        }

        .theme-toggle {
            background: none;
            border: none;
            font-size: 1.2rem;
            color: var(--dark);
            cursor: pointer;
            margin-left: 20px;
        }

        /* Hero Section */
        #hero {
            height: 100vh;
            display: flex;
            align-items: center;
            padding-top: 80px;
        }

        .hero-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .hero-text {
            flex: 1;
            padding-right: 40px;
        }

        .hero-image {
            flex: 1;
            text-align: center;
        }

        .hero-image img {
            max-width: 70%;
            border-radius: 20px;
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
            animation: float 3s ease-in-out infinite;
        }

        @keyframes float {
            0% { transform: translateY(0px); }
            50% { transform: translateY(-15px); }
            100% { transform: translateY(0px); }
        }

        .hero-btns {
            margin-top: 30px;
        }

        .hero-btns .btn {
            margin-right: 15px;
        }

        /* About Section */
        #about {
            background-color: var(--gray);
        }

        .about-content {
            display: flex;
            align-items: center;
            gap: 40px;
        }

        .about-text {
            flex: 1;
        }

        .about-image {
            flex: 1;
            text-align: center;
        }

        .about-image img {
            max-width: 100%;
            border-radius: 20px;
        }

        /* Skills Section */
        .skills-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 30px;
        }

        .skill-category {
            background-color: var(--gray);
            padding: 30px;
            border-radius: 10px;
            transition: transform 0.3s;
        }

        .skill-category:hover {
            transform: translateY(-5px);
        }

        .skill-category h3 {
            margin-bottom: 20px;
            color: var(--primary);
        }

        .skill-list {
            list-style: none;
        }

        .skill-list li {
            margin-bottom: 10px;
            display: flex;
            align-items: center;
        }

        .skill-list li::before {
            content: '▹';
            color: var(--primary);
            margin-right: 10px;
        }

        /* Projects Section */
        .projects-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: 30px;
        }

        .project-card {
            background-color: var(--gray);
            border-radius: 10px;
            overflow: hidden;
            transition: transform 0.3s;
        }

        .project-card:hover {
            transform: translateY(-5px);
        }

        .project-image {
            height: 200px;
            overflow: hidden;
        }

        .project-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }

        .project-card:hover .project-image img {
            transform: scale(1.05);
        }

        .project-info {
            padding: 20px;
        }

        .project-tech {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin: 15px 0;
        }

        .tech-tag {
            background-color: var(--primary);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.8rem;
        }

        .project-links {
            display: flex;
            gap: 15px;
            margin-top: 20px;
        }

        
        /* Experience Section */
        .experience-item {
            margin-bottom: 40px;
        }

        .experience-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 10px;
        }

        .experience-title {
            font-weight: 600;
        }

        .experience-date {
            color: var(--secondary);
        }

        /* Certifications Section */
        .certifications-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 30px;
        }

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

        /* Achievements Section */
        .achievements-list {
            list-style: none;
        }

        .achievements-list li {
            margin-bottom: 15px;
            padding-left: 20px;
            position: relative;
        }

        .achievements-list li::before {
            content: '🏆';
            position: absolute;
            left: 0;
        }

        /* Contact Section */
        #contact {
            background-color: var(--gray);
        }

        .contact-container {
            display: flex;
            gap: 40px;
        }

        .contact-info {
            flex: 1;
        }

        .contact-info h3 {
            margin-bottom: 20px;
        }

        .contact-details {
            margin-bottom: 30px;
        }

        .contact-details p {
            margin-bottom: 10px;
            display: flex;
            align-items: center;
        }

        .contact-details i {
            margin-right: 10px;
            color: var(--primary);
        }

        .social-links {
            display: flex;
            gap: 15px;
        }

        .social-links a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background-color: var(--primary);
            color: white;
            border-radius: 50%;
            transition: all 0.3s;
        }

        .social-links a:hover {
            background-color: var(--primary-dark);
            transform: translateY(-3px);
        }

        .contact-form {
            flex: 1;
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            margin-bottom: 5px;
            font-weight: 500;
        }

        .form-group input,
        .form-group textarea {
            width: 100%;
            padding: 10px;
            border: 1px solid var(--dark-gray);
            border-radius: 4px;
            background-color: var(--light);
            color: var(--dark);
        }

        .form-group textarea {
            height: 150px;
            resize: vertical;
        }

        /* Footer */
        footer {
            text-align: center;
            padding: 20px 0;
            background-color: var(--dark);
            color: white;
        }

        /* Responsive Design */
        @media (max-width: 992px) {
            .hero-content {
                flex-direction: column;
            }

            .hero-text {
                padding-right: 0;
                margin-bottom: 40px;
                text-align: center;
            }

            .hero-btns {
                display: flex;
                justify-content: center;
            }

            .about-content {
                flex-direction: column;
            }

            .contact-container {
                flex-direction: column;
            }

            .timeline-item:nth-child(odd),
            .timeline-item:nth-child(even) {
                padding: 0;
                padding-left: 30px;
                text-align: left;
            }

            .education-timeline::before {
                left: 0;
            }

            .timeline-dot {
                left: -9px;
            }
        }

        @media (max-width: 768px) {
            h1 {
                font-size: 2.5rem;
            }

            h2 {
                font-size: 2rem;
            }

            nav ul {
                display: none;
            }

            .mobile-menu-btn {
                display: block;
            }

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

        @media (max-width: 576px) {
            section {
                padding: 60px 0;
            }

            .hero-btns {
                flex-direction: column;
                align-items: center;
            }

            .hero-btns .btn {
                margin-right: 0;
                margin-bottom: 15px;
                width: 100%;
                max-width: 200px;
            }
        }