:root {
            --primary-glow: radial-gradient(circle, rgba(123, 31, 162, 0.5) 0%, rgba(0, 0, 0, 0) 70%);
            --secondary-glow: radial-gradient(circle, rgba(3, 169, 244, 0.4) 0%, rgba(0, 0, 0, 0) 70%);
            
            /* Dark Mode Varsayılan */
            --bg-color: #0a0a0c;
            --text-color: #ffffff;
            --glass-bg: rgba(255, 255, 255, 0.05);
            --glass-border: rgba(255, 255, 255, 0.1);
            --accent-color: #bb86fc;
            --terminal-bg: rgba(15, 15, 20, 0.9);
        }

        [data-theme="light"] {
            --bg-color: #f0f2f5;
            --text-color: #1a1a1a;
            --glass-bg: rgba(255, 255, 255, 0.6);
            --glass-border: rgba(0, 0, 0, 0.1);
            --accent-color: #6200ee;
            --terminal-bg: rgba(240, 240, 245, 0.95);
        }

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

        body {
            font-family: 'Inter', sans-serif;
            background-color: var(--bg-color);
            color: var(--text-color);
            line-height: 1.6;
            overflow-x: hidden;
            transition: background-color 0.3s ease, color 0.3s ease;
        }

        /* --- Arka Plan Animasyonu --- */
        .background-blobs {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
            overflow: hidden;
        }

        .blob {
            position: absolute;
            width: 500px;
            height: 500px;
            background: var(--primary-glow);
            filter: blur(80px);
            border-radius: 50%;
            z-index: -1;
            animation: move 20s infinite alternate;
        }

        .blob-2 {
            background: var(--secondary-glow);
            width: 400px;
            height: 400px;
            right: 0;
            bottom: 0;
            animation: move 15s infinite alternate-reverse;
        }

        @keyframes move {
            from { transform: translate(-10%, -10%); }
            to { transform: translate(20%, 20%); }
        }

        /* --- Navigasyon --- */
        nav {
            position: fixed;
            top: 0;
            width: 100%;
            padding: 20px 10%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            backdrop-filter: blur(10px);
            background: var(--glass-bg);
            border-bottom: 1px solid var(--glass-border);
            z-index: 1000;
        }

        .logo {
            font-weight: 800;
            font-size: 1.5rem;
            letter-spacing: -1px;
            color: var(--accent-color);
        }

        .nav-links {
            display: flex;
            gap: 30px;
            list-style: none;
            align-items: center;
        }

        .nav-links a {
            text-decoration: none;
            color: var(--text-color);
            font-weight: 500;
            transition: 0.3s;
            font-size: 0.9rem;
        }

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

        .theme-toggle {
            cursor: pointer;
            background: none;
            border: none;
            color: var(--text-color);
            font-size: 1.2rem;
        }

        /* --- Hero Bölümü --- */
        section {
            padding: 100px 10%;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

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

        .hero-content h1 {
            font-size: 4rem;
            font-weight: 800;
            margin-bottom: 20px;
            background: linear-gradient(45deg, var(--accent-color), #03a9f4);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-content p {
            font-size: 1.2rem;
            opacity: 0.8;
            margin-bottom: 30px;
        }

        /* --- Terminal Simülasyonu --- */
        .terminal-container {
            width: 100%;
            max-width: 600px;
            height: 300px;
            background: var(--terminal-bg);
            border-radius: 12px;
            border: 1px solid var(--glass-border);
            box-shadow: 0 20px 40px rgba(0,0,0,0.3);
            margin-top: 40px;
            font-family: 'Fira Code', monospace;
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }

        .terminal-header {
            background: rgba(255,255,255,0.05);
            padding: 10px 15px;
            display: flex;
            gap: 8px;
        }

        .dot { width: 12px; height: 12px; border-radius: 50%; }
        .red { background: #ff5f56; }
        .yellow { background: #ffbd2e; }
        .green { background: #27c93f; }

        .terminal-body {
            padding: 15px;
            flex-grow: 1;
            overflow-y: auto;
            font-size: 0.85rem;
        }

        .terminal-input-line {
            display: flex;
            gap: 8px;
        }

        .prompt { color: var(--accent-color); font-weight: bold; }
        .terminal-input {
            background: none;
            border: none;
            color: #fff;
            outline: none;
            width: 100%;
            font-family: inherit;
        }

        /* --- Projeler Bölümü --- */
        .section-title {
            font-size: 2.5rem;
            margin-bottom: 50px;
            text-align: center;
        }

        .projects-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }

        .project-card {
            background: var(--glass-bg);
            backdrop-filter: blur(10px);
            border: 1px solid var(--glass-border);
            border-radius: 20px;
            padding: 25px;
            transition: 0.4s;
            position: relative;
            overflow: hidden;
        }

        .project-card:hover {
            transform: translateY(-10px);
            border-color: var(--accent-color);
        }

        .project-tags {
            display: flex;
            gap: 8px;
            margin: 15px 0;
            flex-wrap: wrap;
        }

        .tag {
            background: rgba(187, 134, 252, 0.1);
            color: var(--accent-color);
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
        }

        .project-btn {
            display: inline-block;
            margin-top: 15px;
            text-decoration: none;
            color: var(--text-color);
            font-weight: 600;
            border-bottom: 2px solid var(--accent-color);
            padding-bottom: 2px;
            font-size: 0.9rem;
        }

        /* --- Yetenekler Bölümü --- */
        .skills-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
            gap: 20px;
            text-align: center;
        }

        .skill-item {
            background: var(--glass-bg);
            padding: 30px 20px;
            border-radius: 15px;
            border: 1px solid var(--glass-border);
            transition: 0.3s;
        }

        .skill-item i {
            font-size: 2.5rem;
            margin-bottom: 15px;
            color: var(--accent-color);
        }

        /* --- İletişim Formu --- */
        .contact-content {
            display: grid;
            grid-template-columns: 1fr 1.5fr;
            gap: 50px;
        }

        .contact-form {
            background: var(--glass-bg);
            backdrop-filter: blur(15px);
            padding: 40px;
            border-radius: 20px;
            border: 1px solid var(--glass-border);
        }

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

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-size: 0.9rem;
        }

        .form-group input, .form-group textarea {
            width: 100%;
            padding: 12px;
            background: rgba(255,255,255,0.05);
            border: 1px solid var(--glass-border);
            border-radius: 8px;
            color: #fff;
            outline: none;
        }

        [data-theme="light"] .form-group input, [data-theme="light"] .form-group textarea {
            color: #333;
        }

        .submit-btn {
            background: var(--accent-color);
            color: #fff;
            padding: 12px 30px;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: 0.3s;
        }

        .submit-btn:hover {
            opacity: 0.9;
            transform: scale(1.02);
        }

        /* --- Responsive --- */
        @media (max-width: 768px) {
            .hero-content h1 { font-size: 2.5rem; }
            .nav-links { display: none; }
            .contact-content { grid-template-columns: 1fr; }
            section { padding: 80px 5%; }
        }
        /* --- Masaüstü Varsayılan --- */
.hamburger {
    display: none; /* Masaüstünde gizle */
    cursor: pointer;
    z-index: 1002; /* Menü katmanının üzerinde kalması için */
    width: 40px;
    height: 40px;
    border-radius: 50%;
    text-align: center;
    line-height: 40px;
    transition: background 0.3s ease;
}

.hamburger:hover {
    background: rgba(255, 255, 255, 0.1);
}

.hamburger i {
    font-size: 1.5rem;
    color: var(--text-color);
    transition: transform 0.4s cubic-bezier(0.68, -0.55, 0.27, 1.55);
}

/* --- Mobil Görünüm (768px altı) --- */
@media screen and (max-width: 768px) {
    .hamburger {
        display: block;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%; /* Başlangıçta gizli */
        height: 100vh;
        width: 80%; /* Mobilde daha geniş alan */
        max-width: 400px; /* Tablette çok genişlememesi için sınır */
        
        /* Modern Gradient & Glassmorphism */
        background: linear-gradient(135deg, rgba(15, 23, 42, 0.98) 0%, rgba(30, 41, 59, 0.95) 100%);
        backdrop-filter: blur(25px);
        -webkit-backdrop-filter: blur(25px);
        border-left: 1px solid rgba(255, 255, 255, 0.08);
        box-shadow: -20px 0 50px rgba(0, 0, 0, 0.5);
        
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 3rem;
        
        z-index: 1000;
        /* Daha akıcı, "yaylanan" bir geçiş efekti */
        transition: right 0.6s cubic-bezier(0.77, 0, 0.18, 1);
    }

    /* Menü Açık Durumu */
    .nav-links.active {
        right: 0;
    }

    /* Link Animasyonları (Aşağıdan yukarı süzülme) */
    .nav-links li {
        opacity: 0;
        transform: translateY(30px);
        transition: all 0.4s ease-out;
        list-style: none;
    }
    
    .nav-links.active li {
        opacity: 1;
        transform: translateY(0);
    }
    
    /* Her linkin sırayla gelmesi için gecikme (Stagger Effect) */
    .nav-links.active li:nth-child(1) { transition-delay: 0.2s; }
    .nav-links.active li:nth-child(2) { transition-delay: 0.3s; }
    .nav-links.active li:nth-child(3) { transition-delay: 0.4s; }
    .nav-links.active li:nth-child(4) { transition-delay: 0.5s; }

    /* Link Tipografisi ve Hover */
    .nav-links a {
        font-size: 1.8rem; /* Daha büyük ve okunabilir */
        font-weight: 600;
        color: var(--text-color);
        text-transform: uppercase;
        letter-spacing: 2px;
        position: relative;
        text-decoration: none;
        padding: 5px 0;
        transition: color 0.3s;
    }

    /* Alt Çizgi Animasyonu */
    .nav-links a::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        width: 0;
        height: 2px;
        background: var(--accent-color);
        transition: width 0.3s ease;
        box-shadow: 0 0 10px var(--accent-color); /* Neon parlama */
    }

    .nav-links a:hover {
        color: var(--accent-color);
        text-shadow: 0 0 15px rgba(56, 189, 248, 0.4);
    }

    .nav-links a:hover::after {
        width: 100%;
    }
}