:root {
            --primary: #4CAF50;
            --primary-variant: #2E7D32;
            --secondary: #8BC34A;
            --accent: #FF5722;
            --bg: #121212;
            --surface: #1e1e1e;
            --error: #f44336;
            --on-primary: #ffffff;
            --on-secondary: #000000;
            --on-bg: #ffffff;
            --on-surface: #ffffff;
            --on-error: #ffffff;
            --transition: all 0.3s ease;
            --card-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
            --card-hover-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
        }

        [data-theme="light"] {
            --primary: #4CAF50;
            --primary-variant: #2E7D32;
            --secondary: #8BC34A;
            --accent: #FF5722;
            --bg: #f5f5f5;
            --surface: #ffffff;
            --error: #d32f2f;
            --on-primary: #ffffff;
            --on-secondary: #000000;
            --on-bg: #333333;
            --on-surface: #333333;
            --on-error: #ffffff;
            --card-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            --card-hover-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            background-color: var(--bg);
            color: var(--on-bg);
            line-height: 1.6;
            transition: var(--transition);
            overflow-x: hidden;
        }

        .container {
            width: 90%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        section {
            padding: 80px 0;
            opacity: 0;
            transform: translateY(20px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }

        section.visible {
            opacity: 1;
            transform: translateY(0);
        }

        h1, h2, h3, h4 {
            margin-bottom: 20px;
            color: var(--primary);
        }

        p {
            margin-bottom: 15px;
        }

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

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

        .btn {
            display: inline-block;
            padding: 12px 30px;
            background-color: var(--primary);
            color: var(--on-primary);
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
            transition: 0.5s;
        }

        .btn:hover::before {
            left: 100%;
        }

        .btn:hover {
            background-color: var(--primary-variant);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
        }

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

        .btn-secondary:hover {
            background-color: var(--primary);
            color: var(--on-primary);
        }

        /* Header & Navigation */
        header {
            position: fixed;
            top: 0;
            width: 100%;
            background-color: rgba(18, 18, 18, 0.95);
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
            transition: var(--transition);
            backdrop-filter: blur(10px);
        }

        [data-theme="light"] header {
            background-color: rgba(245, 245, 245, 0.95);
        }

        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
        }

        .logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary);
        }

        .nav-links {
            display: flex;
            list-style: none;
        }

        .nav-links li {
            margin-left: 30px;
        }

        .nav-links a {
            color: var(--on-bg);
            font-weight: 500;
            position: relative;
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--primary);
            transition: width 0.3s ease;
        }

        .nav-links a:hover::after {
            width: 100%;
        }

        .menu-btn {
            display: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--on-bg);
        }

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

        .theme-toggle:hover {
            color: var(--primary);
            transform: rotate(30deg);
        }

        /* Enhanced Home Section */
        #home {
            height: 100vh;
            display: flex;
            align-items: center;
            background: linear-gradient(135deg, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.8) 100%), 
                        url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><rect width="100" height="100" fill="%23121212"/><path d="M0 0L100 100" stroke="%234CAF50" stroke-width="0.5"/><path d="M100 0L0 100" stroke="%234CAF50" stroke-width="0.5"/></svg>');
            background-size: cover;
            background-position: center;
            position: relative;
            overflow: hidden;
        }

        #home::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(circle at 20% 50%, rgba(76, 175, 80, 0.1) 0%, transparent 50%);
        }

        .hero-content {
            max-width: 800px;
            position: relative;
            z-index: 2;
        }

        .hero-content h1 {
            font-size: 3.5rem;
            margin-bottom: 10px;
            animation: fadeInDown 1s ease;
            background: linear-gradient(45deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .hero-content h2 {
            font-size: 2rem;
            color: var(--secondary);
            margin-bottom: 20px;
            animation: fadeInDown 1s ease 0.2s forwards;
            opacity: 0;
            min-height: 2.5rem;
        }

        .hero-content p {
            font-size: 1.2rem;
            margin-bottom: 30px;
            animation: fadeInDown 1s ease 0.4s forwards;
            opacity: 0;
        }

        .hero-buttons {
            display: flex;
            gap: 15px;
            animation: fadeInDown 1s ease 0.6s forwards;
            opacity: 0;
        }

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

        .about-content {
            display: flex;
            align-items: center;
            gap: 50px;
        }

        .about-text {
            flex: 1;
        }

        .about-actions {
            margin-top: 30px;
        }

        /* Enhanced about image styles */
        .about-image {
            flex: 1;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: var(--card-shadow);
            transition: var(--transition);
            position: relative;
            transform-style: preserve-3d;
            perspective: 1000px;
        }

        .about-image::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, rgba(76, 175, 80, 0.1) 0%, transparent 70%);
            z-index: 1;
        }

        .about-image:hover {
            transform: translateY(-10px) rotateY(5deg) rotateX(2deg);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
        }

        .about-image img {
            width: 100%;
            height: auto;
            display: block;
            transition: transform 0.5s ease;
            transform: translateZ(10px);
        }

        .about-image:hover img {
            transform: scale(1.05) translateZ(15px);
        }

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

        .skill-category {
            background-color: var(--surface);
            padding: 30px;
            border-radius: 10px;
            box-shadow: var(--card-shadow);
            transition: var(--transition);
            transform-style: preserve-3d;
        }

        .skill-category:hover {
            transform: translateY(-5px) rotateX(2deg);
            box-shadow: var(--card-hover-shadow);
        }

        .skill-category h3 {
            color: var(--secondary);
            margin-bottom: 20px;
            display: flex;
            align-items: center;
        }

        .skill-category h3 i {
            margin-right: 10px;
        }

        .skill-item {
            margin-bottom: 15px;
        }

        .skill-name {
            display: flex;
            justify-content: space-between;
            margin-bottom: 5px;
        }

        .skill-bar {
            height: 10px;
            background-color: #333;
            border-radius: 5px;
            overflow: hidden;
        }

        [data-theme="light"] .skill-bar {
            background-color: #e0e0e0;
        }

        .skill-progress {
            height: 100%;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 5px;
            width: 0;
            transition: width 1.5s ease-in-out;
        }

        /* Experience Section */
        #experience {
            background-color: var(--bg);
        }

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

        .timeline::after {
            content: '';
            position: absolute;
            width: 6px;
            background: linear-gradient(to bottom, var(--primary), var(--secondary));
            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(--surface);
            border-radius: 10px;
            box-shadow: var(--card-shadow);
            transition: var(--transition);
        }

        .timeline-content:hover {
            transform: translateY(-5px);
            box-shadow: var(--card-hover-shadow);
        }

        .timeline-date {
            font-weight: bold;
            color: var(--primary);
            margin-bottom: 10px;
        }

        .timeline-title {
            margin-bottom: 10px;
            color: var(--secondary);
        }

        .timeline-desc {
            margin-bottom: 0;
        }

        .timeline-item::after {
            content: '';
            position: absolute;
            width: 25px;
            height: 25px;
            background-color: var(--surface);
            border: 4px solid var(--primary);
            border-radius: 50%;
            top: 15px;
            z-index: 1;
        }

        .timeline-item:nth-child(odd)::after {
            right: -13px;
        }

        .timeline-item:nth-child(even)::after {
            left: -13px;
        }

        /* Projects Section */
        #projects {
            background-color: var(--surface);
            perspective: 1000px;
        }

        .projects-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 30px;
        }

        .project-card {
            background-color: var(--bg);
            border-radius: 15px;
            overflow: hidden;
            box-shadow: var(--card-shadow);
            transition: all 0.5s ease;
            opacity: 0;
            transform: translateY(20px);
            transform-style: preserve-3d;
        }

        .project-card.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .project-card:hover {
            transform: translateY(-10px) rotateX(5deg) rotateY(5deg);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
        }

        .project-image {
            height: 200px;
            overflow: hidden;
            position: relative;
            transform: translateZ(20px);
        }

        .project-image::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(to bottom, rgba(0,0,0,0.1), rgba(76,175,80,0.3));
            opacity: 0;
            transition: var(--transition);
        }

        .project-card:hover .project-image::after {
            opacity: 1;
        }

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

        .project-card:hover .project-image img {
            transform: scale(1.1);
        }

        .project-info {
            padding: 20px;
            transform: translateZ(10px);
        }

        .project-info h3 {
            margin-bottom: 10px;
            color: var(--primary);
        }

        .project-tags {
            display: flex;
            flex-wrap: wrap;
            margin: 10px 0;
        }

        .project-tag {
            background: linear-gradient(45deg, var(--primary), var(--secondary));
            color: white;
            padding: 5px 10px;
            border-radius: 20px;
            font-size: 0.8rem;
            margin-right: 5px;
            margin-bottom: 5px;
            transition: var(--transition);
        }

        .project-tag:hover {
            transform: scale(1.05) translateZ(5px);
        }

        /* Enhanced typing animation */
        .typing-text {
            position: relative;
            display: inline-block;
        }

        .typing-text::after {
            content: '|';
            position: absolute;
            right: -8px;
            animation: blink 0.7s infinite;
        }

        @keyframes typing {
            from { width: 0 }
            to { width: 100% }
        }

        @keyframes blink {
            0%, 50% { opacity: 1 }
            51%, 100% { opacity: 0 }
        }

        /* Contact Section */
        .contact-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
        }

        .contact-info {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .contact-item {
            display: flex;
            align-items: center;
            transition: var(--transition);
        }

        .contact-item:hover {
            transform: translateX(5px);
        }

        .contact-item i {
            font-size: 1.5rem;
            color: var(--primary);
            margin-right: 15px;
        }

        .contact-form {
            display: flex;
            flex-direction: column;
        }

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

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

        .form-group input,
        .form-group textarea {
            width: 100%;
            padding: 12px;
            background-color: #333;
            border: none;
            border-radius: 4px;
            color: white;
            transition: var(--transition);
        }

        [data-theme="light"] .form-group input,
        [data-theme="light"] .form-group textarea {
            background-color: #f0f0f0;
            color: #333;
            border: 1px solid #ddd;
        }

        .form-group input:focus,
        .form-group textarea:focus {
            outline: none;
            box-shadow: 0 0 0 2px var(--primary);
        }

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

        /* Footer */
        footer {
            background-color: #0a0a0a;
            padding: 40px 0 20px;
            text-align: center;
            transition: var(--transition);
        }

        [data-theme="light"] footer {
            background-color: #e0e0e0;
        }

        .social-links {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-bottom: 20px;
        }

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

        .social-links a:hover {
            background-color: var(--primary);
            transform: translateY(-5px);
        }

        .social-links i {
            font-size: 1.2rem;
        }

        .copyright {
            margin-top: 20px;
            color: #777;
        }

        /* Back to top button */
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: linear-gradient(45deg, var(--primary), var(--secondary));
            color: var(--on-primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 999;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
        }

        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }

        .back-to-top:hover {
            transform: translateY(-3px);
        }

        /* Loading animation */
        .loader {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: var(--bg);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 9999;
            transition: opacity 0.5s ease, visibility 0.5s ease;
        }

        .loader.hidden {
            opacity: 0;
            visibility: hidden;
        }

        .loader-spinner {
            width: 50px;
            height: 50px;
            border: 5px solid rgba(255, 255, 255, 0.2);
            border-radius: 50%;
            border-top-color: var(--primary);
            animation: spin 1s ease-in-out infinite;
        }

        /* Animations */
        @keyframes fadeInDown {
            from {
                opacity: 0;
                transform: translateY(-20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        /* Particle background effect */
        .particles {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 1;
        }

        .particle {
            position: absolute;
            background-color: var(--primary);
            border-radius: 50%;
            opacity: 0.3;
        }

        /* Responsive Design */
        @media (max-width: 1200px) {
            .container {
                width: 95%;
            }
        }

        @media (max-width: 992px) {
            .about-content {
                flex-direction: column;
            }
            
            .contact-container {
                grid-template-columns: 1fr;
            }
            
            .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: 18px;
            }
            
            .timeline-item:nth-child(odd)::after {
                right: auto;
            }
            
            .hero-content h1 {
                font-size: 2.8rem;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                position: fixed;
                top: 70px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 70px);
                background-color: var(--bg);
                flex-direction: column;
                align-items: center;
                justify-content: center;
                transition: all 0.5s ease;
                z-index: 999;
            }
            
            .nav-links.active {
                left: 0;
            }
            
            .nav-links li {
                margin: 20px 0;
            }
            
            .menu-btn {
                display: block;
            }
            
            .hero-content h1 {
                font-size: 2.2rem;
            }
            
            .hero-content h2 {
                font-size: 1.4rem;
            }

            .theme-toggle {
                margin-left: 15px;
            }
            
            .hero-buttons {
                flex-direction: column;
            }
            
            .projects-grid {
                grid-template-columns: 1fr;
            }
            
            .skills-container {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 480px) {
            .hero-content h1 {
                font-size: 1.8rem;
            }
            
            .hero-content h2 {
                font-size: 1.2rem;
            }
            
            .hero-content p {
                font-size: 1rem;
            }
            
            section {
                padding: 60px 0;
            }
            
            .container {
                padding: 0 15px;
            }
        }