:root {
            /* Light theme variables */
            --bg-primary: #f8f9fa;
            --bg-secondary: #ffffff;
            --text-primary: #212529;
            --text-secondary: #495057;
            --accent: #4361ee;
            --accent-light: #4895ef;
            --accent-dark: #3a0ca3;
            --shadow: rgba(0, 0, 0, 0.1);
            --card-bg: #ffffff;
            --nav-dot: #adb5bd;

            /* Animation and transition variables */
            --transition: all 0.3s ease;
            --section-spacing: 100px;
        }

        [data-theme="dark"] {
            --bg-primary: #121212;
            --bg-secondary: #1e1e1e;
            --text-primary: #e6e6e6;
            --text-secondary: #b3b3b3;
            --accent: #4361ee;
            --accent-light: #4895ef;
            --accent-dark: #3a0ca3;
            --shadow: rgba(0, 0, 0, 0.3);
            --card-bg: #1e1e1e;
            --nav-dot: #4d4d4d;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Inter', sans-serif;
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            transition: var(--transition);
            overflow-x: hidden;
        }

        body[dir="rtl"] {
            font-family: 'Cairo', sans-serif;
        }

        /* Header and navigation */
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background-color: var(--bg-secondary);
            box-shadow: 0 2px 10px var(--shadow);
            padding: 1rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition);
        }

        .logo {
            font-weight: 700;
            font-size: 1.5rem;
            color: var(--accent);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .logo i {
            font-size: 1.8rem;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 1.5rem;
        }

        .nav-links {
            display: flex;
            gap: 1.5rem;
            list-style: none;
        }

        .nav-link {
            color: var(--text-primary);
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
            position: relative;
            padding: 0.5rem 0;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--accent);
            transition: var(--transition);
        }

        .nav-link:hover::after,
        .nav-link.active::after {
            width: 100%;
        }

        .nav-controls {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .theme-toggle {
            background: none;
            border: none;
            cursor: pointer;
            font-size: 1.2rem;
            color: var(--text-primary);
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: var(--bg-primary);
        }

        .theme-toggle:hover {
            transform: rotate(15deg);
            background-color: var(--accent-light);
            color: white;
        }

        .language-switch {
            background: none;
            border: 2px solid var(--accent);
            color: var(--accent);
            padding: 0.4rem 0.8rem;
            border-radius: 4px;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .language-switch:hover {
            background-color: var(--accent);
            color: white;
        }

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

        /* Hero section */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            padding: 100px 2rem 2rem;
            max-width: 1200px;
            margin: 0 auto;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 500px;
            height: 500px;
            border-radius: 50%;
            background: linear-gradient(45deg, var(--accent-light), transparent);
            opacity: 0.1;
            animation: float 8s ease-in-out infinite;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: -30%;
            left: -10%;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: linear-gradient(45deg, transparent, var(--accent-dark));
            opacity: 0.1;
            animation: float 10s ease-in-out infinite;
        }

        .hero-content {
            max-width: 650px;
            position: relative;
            z-index: 1;
        }

        .hero-title {
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            color: var(--text-primary);
            animation: fadeInUp 1s ease-out;
        }

        .hero-catchline {
            font-size: 1.5rem;
            margin-bottom: 2.5rem;
            color: var(--text-secondary);
            animation: fadeInUp 1s ease-out 0.2s both;
        }

        .hero-buttons {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
            animation: fadeInUp 1s ease-out 0.4s both;
        }

        .btn {
            padding: 0.8rem 1.5rem;
            border-radius: 4px;
            font-weight: 600;
            text-decoration: none;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            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: var(--transition);
        }

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

        .btn-primary {
            background-color: var(--accent);
            color: white;
            box-shadow: 0 4px 14px rgba(67, 97, 238, 0.4);
        }

        .btn-primary:hover {
            background-color: var(--accent-light);
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(67, 97, 238, 0.5);
        }

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

        .btn-secondary:hover {
            background-color: var(--accent);
            color: white;
            transform: translateY(-3px);
        }

        /* Sections common styles */
        section {
            padding: var(--section-spacing) 2rem;
            max-width: 1200px;
            margin: 0 auto;
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.8s ease, transform 0.8s ease;
        }

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

        .section-title {
            font-size: 2.5rem;
            margin-bottom: 3rem;
            text-align: center;
            color: var(--accent);
            position: relative;
            display: inline-block;
            left: 50%;
            transform: translateX(-50%);
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--accent);
            border-radius: 2px;
            transition: var(--transition);
        }

        .section-title:hover::after {
            width: 120px;
        }

        /* About section */
        .about-content {
            text-align: center;
            max-width: 800px;
            margin: 0 auto;
            font-size: 1.2rem;
            color: var(--text-secondary);
        }

        /* Skills section */
        .skills-container {
            max-width: 900px;
            margin: 0 auto;
        }

        .skills-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
            gap: 2rem;
            justify-items: center;
        }

        .skill-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            transition: var(--transition);
            padding: 1rem;
            border-radius: 8px;
            background-color: var(--bg-secondary);
            box-shadow: 0 5px 15px var(--shadow);
        }

        .skill-item:hover {
            transform: translateY(-10px) scale(1.05);
            box-shadow: 0 15px 30px var(--shadow);
        }

        .skill-icon {
            font-size: 3.5rem;
            margin-bottom: 0.5rem;
            color: var(--accent);
        }

        .skill-name {
            font-weight: 600;
            color: var(--text-secondary);
        }

        /* Projects section */
        .projects-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: 2.5rem;
        }

        .project-card {
            background-color: var(--card-bg);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 8px 25px var(--shadow);
            transition: var(--transition);
            position: relative;
        }

        .project-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(to bottom, transparent 0%, var(--accent-dark) 100%);
            opacity: 0;
            transition: var(--transition);
            z-index: 1;
        }

        .project-card:hover {
            transform: translateY(-15px);
            box-shadow: 0 20px 40px var(--shadow);
        }

        .project-card:hover::before {
            opacity: 0.1;
        }

        .project-image {
            width: 100%;
            height: 220px;
            background-size: cover;
            background-position: center;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: 600;
            font-size: 1.2rem;
            position: relative;
            overflow: hidden;
        }

        .project-image::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.4);
            transition: var(--transition);
        }

        .project-card:hover .project-image::after {
            background: rgba(67, 97, 238, 0.2);
        }

        .project-content {
            padding: 1.8rem;
            position: relative;
            z-index: 2;
        }

        .project-title {
            font-size: 1.4rem;
            margin-bottom: 0.8rem;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .project-description {
            color: var(--text-secondary);
            margin-bottom: 1.5rem;
            line-height: 1.6;
        }

        .project-tech {
            display: flex;
            gap: 0.5rem;
            flex-wrap: wrap;
        }

        .tech-tag {
            background-color: var(--accent-light);
            color: white;
            padding: 0.3rem 0.8rem;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 500;
        }

        .project-link {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            margin-top: 1rem;
            color: var(--accent);
            text-decoration: none;
            font-weight: 600;
            transition: var(--transition);
        }

        .project-link:hover {
            color: var(--accent-dark);
            transform: translateX(5px);
        }

        /* Services section */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 2.5rem;
        }

        .service-card {
            background-color: var(--card-bg);
            padding: 2.5rem 2rem;
            border-radius: 12px;
            box-shadow: 0 8px 25px var(--shadow);
            text-align: center;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .service-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 5px;
            height: 100%;
            background-color: var(--accent);
            transition: var(--transition);
        }

        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px var(--shadow);
        }

        .service-card:hover::before {
            width: 100%;
            opacity: 0.05;
        }

        .service-icon {
            font-size: 3.5rem;
            color: var(--accent);
            margin-bottom: 1.5rem;
            transition: var(--transition);
        }

        .service-card:hover .service-icon {
            transform: scale(1.1) rotate(5deg);
        }

        .service-title {
            font-size: 1.5rem;
            margin-bottom: 1.2rem;
            color: var(--text-primary);
            position: relative;
            z-index: 2;
        }

        .service-description {
            color: var(--text-secondary);
            position: relative;
            z-index: 2;
        }

        /* Contact section */
        .contact-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
        }

        .contact-form {
            display: flex;
            flex-direction: column;
            gap: 1.8rem;
        }

        .form-group {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
        }

        .form-label {
            font-weight: 600;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .form-input,
        .form-textarea {
            padding: 1rem;
            border: 1px solid #ddd;
            border-radius: 8px;
            font-family: inherit;
            background-color: var(--bg-secondary);
            color: var(--text-primary);
            transition: var(--transition);
        }

        .form-input:focus,
        .form-textarea:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
        }

        .form-textarea {
            min-height: 180px;
            resize: vertical;
        }

        .submit-btn {
            background-color: var(--accent);
            color: white;
            border: none;
            padding: 1.2rem;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }

        .submit-btn:hover {
            background-color: var(--accent-light);
            transform: translateY(-3px);
            box-shadow: 0 6px 15px rgba(67, 97, 238, 0.4);
        }

        .contact-info {
            display: flex;
            flex-direction: column;
            gap: 2.5rem;
            padding: 1rem;
        }

        .social-links {
            display: flex;
            gap: 1.2rem;
            justify-content: center;
        }

        .social-link {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 55px;
            height: 55px;
            border-radius: 50%;
            background-color: var(--accent);
            color: white;
            font-size: 1.5rem;
            transition: var(--transition);
            text-decoration: none;
            box-shadow: 0 5px 15px rgba(67, 97, 238, 0.3);
        }

        .social-link:hover {
            transform: translateY(-5px) scale(1.1);
            background-color: var(--accent-light);
            box-shadow: 0 10px 25px rgba(67, 97, 238, 0.4);
        }

        /* Dot navigation */
        .dot-navigation {
            position: fixed;
            right: 30px;
            top: 50%;
            transform: translateY(-50%);
            display: flex;
            flex-direction: column;
            gap: 1.2rem;
            z-index: 999;
        }

        .dot {
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background-color: var(--nav-dot);
            cursor: pointer;
            transition: var(--transition);
            position: relative;
        }

        .dot::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%) scale(0);
            width: 30px;
            height: 30px;
            border-radius: 50%;
            background-color: rgba(67, 97, 238, 0.2);
            transition: var(--transition);
        }

        .dot:hover::before {
            transform: translate(-50%, -50%) scale(1);
        }

        .dot.active {
            background-color: var(--accent);
            transform: scale(1.4);
        }

        .dot-tooltip {
            position: absolute;
            right: 25px;
            top: 50%;
            transform: translateY(-50%);
            background-color: var(--accent);
            color: white;
            padding: 0.4rem 0.8rem;
            border-radius: 4px;
            font-size: 0.8rem;
            font-weight: 600;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            white-space: nowrap;
        }

        .dot:hover .dot-tooltip {
            opacity: 1;
            visibility: visible;
        }

        /* Footer */
        footer {
            background-color: var(--bg-secondary);
            padding: 3rem 2rem;
            text-align: center;
            color: var(--text-secondary);
            margin-top: var(--section-spacing);
            box-shadow: 0 -5px 15px var(--shadow);
        }

        /* Animations */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes float {

            0%,
            100% {
                transform: translateY(0) rotate(0deg);
            }

            50% {
                transform: translateY(-20px) rotate(5deg);
            }
        }

        @keyframes pulse {

            0%,
            100% {
                transform: scale(1);
            }

            50% {
                transform: scale(1.05);
            }
        }

        /* Responsive design */
        @media (max-width: 1024px) {
            .nav-links {
                gap: 1rem;
            }

            .hero-title {
                font-size: 3rem;
            }
        }

        @media (max-width: 900px) {
            .contact-container {
                grid-template-columns: 1fr;
            }

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

            .hero-catchline {
                font-size: 1.2rem;
            }

            .nav-menu {
                position: fixed;
                top: 70px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 70px);
                background-color: var(--bg-secondary);
                flex-direction: column;
                align-items: center;
                justify-content: flex-start;
                padding-top: 2rem;
                transition: var(--transition);
            }

            .nav-menu.active {
                left: 0;
            }

            .nav-links {
                flex-direction: column;
                gap: 2rem;
                text-align: center;
            }

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

        @media (max-width: 768px) {
            .hero-buttons {
                flex-direction: column;
                align-items: flex-start;
            }

            .dot-navigation {
                right: 15px;
            }

            .section-title {
                font-size: 2rem;
            }

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

            .hero::before,
            .hero::after {
                display: none;
            }
        }

        @media (max-width: 480px) {
            header {
                padding: 1rem;
            }

            .hero {
                padding-top: 120px;
            }

            .hero-title {
                font-size: 2.2rem;
            }

            section {
                padding: 80px 1rem;
            }

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

            .skills-grid {
                grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
                gap: 1.5rem;
            }
        }