:root {
            --primary: #2c3e50;
            --secondary: #3498db;
            --accent: #e74c3c;
            --light: #ecf0f1;
            --dark: #2c3e50;
            --success: #2ecc71;
            --warning: #f39c12;
            --shadow: 0 4px 6px rgba(0,0,0,0.1);
            --transition: all 0.3s ease;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            background-color: #f9f9f9;
            color: #333;
            line-height: 1.6;
        }

        .container {
            width: 90%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }

        /* Header & Navigation */
        header {
            background-color: var(--primary);
            color: white;
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }

        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }

        .logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: white;
            text-decoration: none;
        }

        .logo span {
            color: var(--secondary);
        }

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

        .nav-links li {
            margin-left: 25px;
        }

        .nav-links a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
            padding: 5px 10px;
            border-radius: 4px;
        }

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

        .auth-buttons {
            display: flex;
            gap: 10px;
        }

        .btn {
            padding: 8px 20px;
            border-radius: 4px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            border: none;
        }

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

        .btn-secondary {
            background-color: transparent;
            color: white;
            border: 2px solid white;
        }

        .btn:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }

        .hamburger {
            display: none;
            cursor: pointer;
            font-size: 1.5rem;
        }

        /* Hero Section */
        .hero {
            padding: 150px 0 100px;
            background: linear-gradient(135deg, var(--primary) 0%, #1a2530 100%);
            color: white;
            text-align: center;
        }

        .hero-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .profile-img {
            width: 200px;
            height: 200px;
            border-radius: 50%;
            object-fit: cover;
            border: 5px solid var(--secondary);
            margin-bottom: 30px;
            box-shadow: 0 0 20px rgba(0,0,0,0.3);
        }

        .hero h1 {
            font-size: 3rem;
            margin-bottom: 15px;
        }

        .hero p {
            font-size: 1.2rem;
            margin-bottom: 30px;
            opacity: 0.9;
        }

        .hero-btns {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-top: 30px;
        }

        /* Sections */
        section {
            padding: 80px 0;
        }

        .section-title {
            text-align: center;
            margin-bottom: 50px;
            position: relative;
        }

        .section-title h2 {
            font-size: 2.5rem;
            color: var(--primary);
            display: inline-block;
        }

        .section-title h2::after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background-color: var(--secondary);
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
        }

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

        .about-text {
            flex: 1;
        }

        .about-text h3 {
            font-size: 1.8rem;
            margin-bottom: 20px;
            color: var(--primary);
        }

        .skills {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 20px;
        }

        .skill {
            background-color: var(--light);
            padding: 8px 15px;
            border-radius: 20px;
            font-size: 0.9rem;
            color: var(--dark);
        }

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

        .project-card {
            background-color: white;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }

        .project-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.15);
        }

        .project-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
        }

        .project-info {
            padding: 20px;
        }

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

        .project-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 5px;
            margin: 15px 0;
        }

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

        .project-links {
            display: flex;
            gap: 10px;
        }

        .project-link {
            color: var(--secondary);
            text-decoration: none;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 5px;
        }

        /* SPT2 Section */
        .spt2-content {
            background-color: white;
            padding: 30px;
            border-radius: 8px;
            box-shadow: var(--shadow);
        }

        .mobile-projects {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 20px;
            margin-top: 30px;
        }

        .mobile-project {
            background-color: var(--light);
            padding: 20px;
            border-radius: 8px;
            text-align: center;
        }

        .mobile-project i {
            font-size: 2.5rem;
            color: var(--secondary);
            margin-bottom: 15px;
        }

        .video-container {
            margin: 30px 0;
            text-align: center;
        }

        .video-placeholder {
            width: 100%;
            max-width: 600px;
            height: 340px;
            background-color: #ddd;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto;
            color: #777;
            font-size: 1.2rem;
        }

        /* Contact Section */
        .contact-container {
            display: flex;
            gap: 40px;
        }

        .contact-info {
            flex: 1;
        }

        .contact-item {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
        }

        .contact-item i {
            width: 40px;
            height: 40px;
            background-color: var(--secondary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
        }

        .contact-form {
            flex: 1;
        }

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

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
        }

        .form-control {
            width: 100%;
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 1rem;
        }

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

        /* Footer */
        footer {
            background-color: var(--primary);
            color: white;
            padding: 40px 0 20px;
        }

        .footer-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 30px;
        }

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

        .social-link {
            width: 40px;
            height: 40px;
            background-color: rgba(255,255,255,0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            text-decoration: none;
            transition: var(--transition);
        }

        .social-link:hover {
            background-color: var(--secondary);
            transform: translateY(-3px);
        }

        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            opacity: 0.7;
        }

        /* Modal Styles */
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0,0,0,0.5);
            z-index: 2000;
            align-items: center;
            justify-content: center;
        }

        .modal-content {
            background-color: white;
            padding: 30px;
            border-radius: 8px;
            width: 90%;
            max-width: 500px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
        }

        .modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
        }

        .modal-title {
            font-size: 1.5rem;
            color: var(--primary);
        }

        .close-modal {
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: #777;
        }

        .form-options {
            display: flex;
            gap: 10px;
            margin-bottom: 20px;
        }

        .form-option {
            flex: 1;
            text-align: center;
            padding: 10px;
            background-color: var(--light);
            border-radius: 4px;
            cursor: pointer;
            transition: var(--transition);
        }

        .form-option.active {
            background-color: var(--secondary);
            color: white;
        }

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

        @media (max-width: 768px) {
            .nav-links, .auth-buttons {
                display: none;
            }
            
            .hamburger {
                display: block;
            }
            
            .hero h1 {
                font-size: 2.5rem;
            }
            
            .hero-btns {
                flex-direction: column;
                align-items: center;
            }
            
            .projects-grid {
                grid-template-columns: 1fr;
            }
            
            .footer-content {
                flex-direction: column;
                gap: 20px;
                text-align: center;
            }
        }

        @media (max-width: 576px) {
            .hero {
                padding: 120px 0 80px;
            }
            
            .hero h1 {
                font-size: 2rem;
            }
            
            section {
                padding: 60px 0;
            }
            
            .section-title h2 {
                font-size: 2rem;
            }
        }