:root {
            --primary-color: #2563eb;
            --secondary-color: #1e40af;
            --dark-bg: #0f172a;
            --light-bg: #f8fafc;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            scroll-behavior: smooth;
        }

        /* Hero Section */
        .hero {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
            color: white;
            padding: 100px 0;
            min-height: 100vh;
            display: flex;
            align-items: center;
        }

        .hero h1 {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 1rem;
            animation: fadeInUp 1s ease;
        }

        .hero p {
            font-size: 1.5rem;
            margin-bottom: 2rem;
            animation: fadeInUp 1.2s ease;
        }

        .hero .btn {
            animation: fadeInUp 1.4s ease;
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* Navigation */
        .navbar {
            background-color: rgba(15, 23, 42, 0.95) !important;
            backdrop-filter: blur(10px);
            transition: all 0.3s ease;
        }

        .navbar-brand {
            font-weight: 700;
            font-size: 1.5rem;
        }

        .nav-link {
            color: white !important;
            margin: 0 10px;
            transition: color 0.3s ease;
        }

        .nav-link:hover {
            color: var(--primary-color) !important;
        }

        /* About Section */
        .about-section {
            padding: 80px 0;
            background-color: white;
        }

        .section-title {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 3rem;
            text-align: center;
            color: var(--dark-bg);
            position: relative;
        }

        .section-title::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: var(--primary-color);
            margin: 20px auto 0;
        }

        .skill-badge {
            display: inline-block;
            padding: 8px 16px;
            margin: 5px;
            background-color: var(--light-bg);
            border: 2px solid var(--primary-color);
            border-radius: 20px;
            color: var(--primary-color);
            font-weight: 500;
            transition: all 0.3s ease;
        }

        .skill-badge:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }

        /* Portfolio Section */
        .portfolio-section {
            padding: 80px 0;
            background-color: var(--light-bg);
        }

        .portfolio-item {
            position: relative;
            overflow: hidden;
            border-radius: 10px;
            margin-bottom: 30px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .portfolio-item:hover {
            transform: translateY(-10px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
        }

        .portfolio-item img {
            width: 100%;
            height: 300px;
            object-fit: cover;
            transition: transform 0.3s ease;
        }

        .portfolio-item:hover img {
            transform: scale(1.1);
        }

        .portfolio-overlay {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(37, 99, 235, 0.9);
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .portfolio-item:hover .portfolio-overlay {
            opacity: 1;
        }

        .portfolio-overlay h4 {
            color: white;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .portfolio-overlay p {
            color: white;
            margin-bottom: 15px;
        }

        .filter-buttons {
            text-align: center;
            margin-bottom: 40px;
        }

        .filter-btn {
            background: white;
            border: 2px solid var(--primary-color);
            color: var(--primary-color);
            padding: 10px 25px;
            margin: 5px;
            border-radius: 25px;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .filter-btn:hover,
        .filter-btn.active {
            background: var(--primary-color);
            color: white;
        }

        /* Contact Section */
        .contact-section {
            padding: 80px 0;
            background-color: white;
        }

        .contact-form {
            background: var(--light-bg);
            padding: 40px;
            border-radius: 10px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }

        .form-control {
            border: 2px solid #e2e8f0;
            border-radius: 8px;
            padding: 12px;
            margin-bottom: 20px;
            transition: border-color 0.3s ease;
        }

        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.25);
        }

        .submit-btn {
            background: var(--primary-color);
            color: white;
            border: none;
            padding: 12px 40px;
            border-radius: 8px;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .submit-btn:hover {
            background: var(--secondary-color);
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
        }

        .contact-info {
            padding: 40px;
        }

        .contact-item {
            display: flex;
            align-items: center;
            margin-bottom: 25px;
        }

        .contact-item i {
            font-size: 2rem;
            color: var(--primary-color);
            margin-right: 20px;
            width: 50px;
            text-align: center;
        }

        /* Footer */
        footer {
            background-color: var(--dark-bg);
            color: white;
            padding: 30px 0;
            text-align: center;
        }

        .social-links a {
            color: white;
            font-size: 1.5rem;
            margin: 0 15px;
            transition: color 0.3s ease;
        }

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

        /* Success Message */
        .success-message {
            display: none;
            background-color: #10b981;
            color: white;
            padding: 15px;
            border-radius: 8px;
            margin-top: 20px;
            text-align: center;
        }

        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.5rem;
            }
            .hero p {
                font-size: 1.2rem;
            }
        }