:root {
            --background: #ffffff;
            --background-alt: #f9fafb;
            --text: #333;
            --text-alt: #666;
            --heading: #1a1a1a;
            --primary: #2563eb;
            --primary-light: #e5edff;
            --card-bg: white;
            --shadow: 0 2px 4px rgba(0,0,0,0.1);
            --nav-shadow: 0 2px 4px rgba(0,0,0,0.1);
            --border: #eee;
        }

        [data-theme="dark"] {
            --background: #121212;
            --background-alt: #1e1e1e;
            --text: #e0e0e0;
            --text-alt: #b0b0b0;
            --heading: #ffffff;
            --primary: #3b82f6;
            --primary-light: #1e293b;
            --card-bg: #252525;
            --shadow: 0 2px 4px rgba(0,0,0,0.3);
            --nav-shadow: 0 2px 8px rgba(0,0,0,0.4);
            --border: #333;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            line-height: 1.6;
            color: var(--text);
            background-color: var(--background);
        }

        /* Theme Toggle */
        .theme-toggle {
            position: fixed;
            bottom: 20px;
            right: 20px;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background-color: var(--primary);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: 0 3px 10px rgba(0,0,0,0.2);
            z-index: 1000;
            border: none;
            outline: none;
            font-size: 1.5rem;
            transform-origin: center;
            transition: transform 0.5s ease, background-color 0.3s ease;
        }

        .theme-toggle:hover {
            transform: scale(1.1);
        }

        .theme-toggle:active {
            transform: scale(0.9);
        }

        /* Navigation */
        nav {
            background: var(--card-bg);
            box-shadow: var(--nav-shadow);
            position: fixed;
            width: 100%;
            z-index: 1000;
        }

        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .nav-logo {
            font-size: 1.5rem;
            font-weight: bold;
            color: var(--heading);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .logo-icon {
            width: 2rem;
            height: 2rem;
            transition: transform 0.3s ease;
        }

        .nav-logo:hover .logo-icon {
            transform: rotate(10deg);
        }

        .nav-links {
            display: flex;
            gap: 2rem;
        }

        .nav-links a {
            color: var(--text-alt);
            text-decoration: none;
            transition: color 0.3s;
        }

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

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

        /* Hero Section */
        .hero {
            padding: 8rem 1rem 4rem;
            background: linear-gradient(to right, var(--background), var(--background-alt));
            min-height: 80vh;
            display: flex;
            align-items: center;
        }

        .hero-content {
            max-width: 1200px;
            margin: 0 auto;
        }

        .hero h1 {
            font-size: 3.5rem;
            line-height: 1.2;
            margin-bottom: 1rem;
            color: var(--heading);
        }

        .hero h1 span {
            color: var(--primary);
            display: block;
            margin-top: 0.5rem;
        }

        .hero p {
            font-size: 1.25rem;
            color: var(--text-alt);
            margin-bottom: 2rem;
            max-width: 600px;
        }

        /* Sections */
        section {
            padding: 5rem 1rem;
        }

        section:nth-child(even) {
            background: var(--background-alt);
        }

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

        h2 {
            font-size: 2.5rem;
            margin-bottom: 2rem;
            color: var(--heading);
        }

        /* Academic Section */
        .academics-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin-top: 2rem;
        }

        .academic-card {
            background: var(--card-bg);
            padding: 1.5rem;
            border-radius: 8px;
            box-shadow: var(--shadow);
        }

        .academic-card h3 {
            color: var(--primary);
            margin-bottom: 1rem;
        }

        .gpa {
            font-size: 1.5rem;
            font-weight: bold;
            color: var(--heading);
            margin-bottom: 0.5rem;
        }

        /* Projects */
        .projects-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin-top: 2rem;
        }

        .project-card {
            background: var(--card-bg);
            border-radius: 8px;
            box-shadow: var(--shadow);
            padding: 1.5rem;
            transition: transform 0.3s, box-shadow 0.3s;
        }

        .project-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.15);
        }

        .project-card h3 {
            font-size: 1.25rem;
            margin-bottom: 1rem;
            color: var(--heading);
        }

        .project-card a {
            color: var(--primary);
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            margin-top: 1rem;
        }

        .project-card a:hover {
            text-decoration: underline;
        }

        .tech-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin: 1rem 0;
        }

        .tech-tag {
            background: var(--primary-light);
            color: var(--primary);
            padding: 0.25rem 0.75rem;
            border-radius: 999px;
            font-size: 0.875rem;
        }

        /* Skills */
        .skills-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }

        .skill-category {
            background: var(--card-bg);
            padding: 1.5rem;
            border-radius: 8px;
            box-shadow: var(--shadow);
        }

        .skill-category h3 {
            margin-bottom: 1rem;
            color: var(--heading);
        }

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

        .skill-list li {
            margin-bottom: 0.5rem;
            display: flex;
            align-items: center;
        }

        .skill-list li::before {
            content: "→";
            margin-right: 0.5rem;
            color: var(--primary);
        }

        /* Contact */
        .contact-links {
            display: flex;
            gap: 1rem;
            margin-top: 2rem;
        }

        .contact-btn {
            display: inline-flex;
            align-items: center;
            padding: 0.75rem 1.5rem;
            border-radius: 6px;
            text-decoration: none;
            color: white;
            font-weight: 500;
            transition: opacity 0.3s, transform 0.3s;
            gap: 0.75rem;
        }

        .contact-btn:hover {
            opacity: 0.9;
            transform: translateY(-3px);
        }

        .contact-btn:active {
            transform: translateY(0);
        }

        .instagram-btn {
            background: linear-gradient(45deg, #405DE6, #5851DB, #833AB4, #C13584, #E1306C, #FD1D1D);
        }

        .facebook-btn {
            background: #1877f2;
        }

        .email-btn {
            background: #ea4335;
        }

        .btn-icon {
            display: inline-block;
            width: 1.5rem;
            height: 1.5rem;
            stroke: white;
            fill: none;
            stroke-width: 2;
            stroke-linecap: round;
            stroke-linejoin: round;
        }

        .instagram-icon {
            animation: pulse 2s infinite;
        }

        .facebook-icon {
            animation: spin 3s infinite;
        }

        .email-icon {
            animation: bounce 2s infinite;
        }

        @keyframes pulse {
            0% {
                transform: scale(1);
            }
            50% {
                transform: scale(1.1);
            }
            100% {
                transform: scale(1);
            }
        }

        @keyframes bounce {
            0%, 100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-5px);
            }
        }

        @keyframes spin {
            0% {
                transform: rotate(0deg);
            }
            25% {
                transform: rotate(10deg);
            }
            75% {
                transform: rotate(-10deg);
            }
            100% {
                transform: rotate(0deg);
            }
        }

        /* Footer */
        footer {
            background: var(--card-bg);
            padding: 2rem 1rem;
            text-align: center;
            color: var(--text-alt);
            border-top: 1px solid var(--border);
        }

        /* Theme transition animation */
        .theme-transition {
            animation: themeTransition 0.5s ease;
        }

        @keyframes themeTransition {
            0% {
                opacity: 0;
            }
            100% {
                opacity: 1;
            }
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }

            .menu-btn {
                display: block;
            }

            .nav-links.active {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: var(--card-bg);
                padding: 1rem;
                box-shadow: var(--shadow);
            }

            .hero h1 {
                font-size: 2.5rem;
            }

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