/* CSS RESET & VARIABLES */
        :root {
            --primary-color: #00aaff; /* Biru terang sebagai aksen */
            --dark-color: #1a1a2e;    /* Biru sangat gelap sebagai background utama */
            --secondary-dark: #16213e; /* Biru gelap untuk card/panel */
            --light-color: #e3e3e3;   /* Warna teks utama */
            --gray-color: #a9a9a9;    /* Warna teks sekunder */
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Poppins', sans-serif;
            background-color: var(--dark-color);
            color: var(--light-color);
            line-height: 1.6;
        }

        /* UTILITY CLASSES */
        .container {
            max-width: 1100px;
            margin: auto;
            padding: 0 2rem;
        }

        section {
            padding: 5rem 0;
        }

        h1, h2, h3 {
            font-weight: 600;
        }
        
        h2 {
            font-size: 2.5rem;
            text-align: center;
            margin-bottom: 1rem;
            color: var(--primary-color);
        }

        .section-subtitle {
            text-align: center;
            font-size: 1.1rem;
            color: var(--gray-color);
            margin-bottom: 4rem;
        }
        
        /* HEADER / NAVBAR */
        .navbar {
            padding: 1rem 0;
            position: fixed;
            width: 100%;
            top: 0;
            left: 0;
            z-index: 1000;
            background: rgba(26, 26, 46, 0.8);
            backdrop-filter: blur(10px);
            transition: all 0.3s ease;
        }
        
        .navbar .container {
            display: flex;
            justify-content: flex-end;
            align-items: center;
        }
        
        .navbar.scrolled {
            box-shadow: 0 2px 10px rgba(0,0,0,0.3);
        }

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

        .nav-links li {
            margin-left: 2rem;
        }

        .nav-links a {
            color: var(--light-color);
            text-decoration: none;
            font-weight: 400;
            transition: color 0.3s ease;
            position: relative;
            padding-bottom: 5px;
        }

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

        .nav-links a:hover::after {
            width: 100%;
        }
        
        .hamburger {
            display: none;
            cursor: pointer;
            font-size: 1.5rem;
            margin-left: 1rem;
        }


        /* HERO SECTION */
        #hero {
            height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .hero-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 2rem;
        }

        .hero-text {
            max-width: 600px;
        }

        .hero-text h3 {
            font-size: 1.5rem;
            font-weight: 400;
        }

        .hero-text h1 {
            font-size: 3.5rem;
            margin: 0.5rem 0;
        }
        
        .hero-text .animated-gradient {
            background: linear-gradient(90deg, var(--primary-color), #f9ff3c, var(--primary-color));
            background-size: 200% 200%;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            animation: gradient-animation 4s ease infinite;
        }

        .hero-text p {
            font-size: 1.2rem;
            color: var(--gray-color);
            margin-bottom: 2rem;
        }

        .btn {
            display: inline-block;
            background: var(--primary-color);
            color: #fff;
            padding: 12px 25px;
            border-radius: 5px;
            text-decoration: none;
            font-weight: 600;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 170, 255, 0.4);
        }

        .hero-image img {
            width: 300px;
            height: 300px;
            border-radius: 50%;
            object-fit: cover;
            border: 5px solid var(--primary-color);
            box-shadow: 0 0 25px rgba(0, 170, 255, 0.3);
            transition: transform 0.4s ease;
        }
        
        .hero-image img:hover {
            transform: scale(1.05);
        }
        
        /* ABOUT SECTION */
        #about .container {
            display: flex;
            align-items: center;
            gap: 4rem;
        }
        
        .about-image img {
            width: 350px;
            border-radius: 10px;
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
        }

        .about-text {
            max-width: 600px;
        }

        .about-text p {
            margin-bottom: 1rem;
            color: var(--gray-color);
            text-align: justify;
        }
        
        /* SKILLS SECTION */
        #skills {
            background-color: var(--secondary-dark);
        }
        
        .skills-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
            gap: 2rem;
            text-align: center;
        }

        .skill-item {
            padding: 1.5rem;
            background: var(--dark-color);
            border-radius: 10px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        
        .skill-item:hover {
            transform: translateY(-10px);
            box-shadow: 0 10px 20px rgba(0, 170, 255, 0.2);
        }
        
        .skill-item i {
            font-size: 3rem;
            color: var(--primary-color);
        }
        
        .skill-item p {
            margin-top: 0.5rem;
            font-weight: 600;
        }
        
        /* PROJECTS SECTION */
        .projects-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
        }

        .project-card {
            background: var(--secondary-dark);
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
            transition: transform 0.3s ease;
        }
        
        .project-card:hover {
            transform: translateY(-10px);
        }

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

        .project-info {
            padding: 1.5rem;
        }

        .project-info h3 {
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }
        
        .project-info p {
            color: var(--gray-color);
            font-size: 0.9rem;
            margin-bottom: 1rem;
        }

        .project-links a {
            color: var(--light-color);
            text-decoration: none;
            margin-right: 1rem;
            font-weight: 600;
            transition: color 0.3s ease;
        }

        .project-links a:hover {
            color: var(--primary-color);
        }
        
        /* CONTACT SECTION */
        #contact {
             background-color: var(--secondary-dark);
        }
        
        .contact-content {
            text-align: center;
            max-width: 600px;
            margin: auto;
        }
        
        .social-icons {
            margin-top: 2rem;
            margin-bottom: 2rem;
        }

        .social-icons a {
            color: var(--light-color);
            font-size: 2rem;
            margin: 0 1rem;
            transition: color 0.3s ease, transform 0.3s ease;
        }
        
        .social-icons a:hover {
            color: var(--primary-color);
            transform: translateY(-5px);
        }
        
        .contact-content .email {
            color: var(--gray-color);
            font-size: 1.1rem;
        }
        
        /* FOOTER */
        footer {
            text-align: center;
            padding: 2rem 0;
            background-color: var(--dark-color);
            border-top: 1px solid var(--secondary-dark);
        }
        
        footer p {
            color: var(--gray-color);
        }
        
        footer a {
            color: var(--primary-color);
            text-decoration: none;
        }
        
        /* ANIMATIONS */
        @keyframes gradient-animation {
            0% { background-position: 0% 50%; }
            50% { background-position: 100% 50%; }
            100% { background-position: 0% 50%; }
        }
        
        /* RESPONSIVE DESIGN */
        @media (max-width: 768px) {
            h2 {
                font-size: 2rem;
            }

            .nav-links {
                position: fixed;
                top: 0;
                right: -100%;
                width: 60%;
                height: 100vh;
                background: var(--secondary-dark);
                flex-direction: column;
                align-items: center;
                justify-content: center;
                transition: right 0.5s ease-in-out;
                box-shadow: -5px 0 15px rgba(0,0,0,0.2);
            }
            
            .nav-links.active {
                right: 0;
            }

            .nav-links li {
                margin: 2rem 0;
            }

            .hamburger {
                display: block;
                z-index: 1001;
            }

            #hero {
                height: auto;
                padding-top: 6rem;
                text-align: center;
            }
            
            .hero-content {
                flex-direction: column-reverse;
            }
            
            .hero-text h1 {
                font-size: 2.8rem;
            }
            
            .hero-text h3 {
                font-size: 1.2rem;
            }
            
            .hero-image img {
                width: 250px;
                height: 250px;
                margin-bottom: 2rem;
            }
            
            #about .container {
                flex-direction: column;
            }
            
            .about-image img {
                width: 100%;
                max-width: 300px;
            }
             .tombol-demo {
                  cursor: pointer;
             }
        }