/* === TEMEL AYARLAR === */
        :root {
            --primary-color: #4A90E2; /* Canlı, güven veren bir mavi */
            --dark-bg: #0D1117;       /* GitHub tarzı koyu (çok profesyonel) */
            --card-bg: #161B22;       /* Arka plandan hafif açık kart rengi */
            --text-color: #C9D1D9;    /* Yumuşak beyaz/gri yazı */
            --header-text: #FFFFFF;   /* Ana başlıklar için saf beyaz */
            --border-color: #30363D;  /* İnce çizgiler ve sınırlar */
        }

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

        html {
            scroll-behavior: smooth; /* Yumuşak kaydırma */
        }

        body {
            font-family: 'Poppins', sans-serif;
            background-color: var(--dark-bg);
            color: var(--text-color);
            line-height: 1.7;
        }

        .container {
            width: 90%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 80px 0;
        }

        h1, h2, h3 {
            color: var(--header-text);
            font-weight: 700;
            margin-bottom: 20px;
        }

        h2 {
            font-size: 2.5rem;
            text-align: center;
        }

        /* === HEADER / NAVİGASYON === */
        .header {
            background-color: var(--card-bg);
            padding: 20px 0;
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
        }

        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 90%;
            max-width: 1200px;
            margin: 0 auto;
        }

        .logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--header-text);
            text-decoration: none;
        }
        .logo span {
            color: var(--primary-color);
        }

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

        .nav-links li {
            margin-left: 30px;
        }

        .nav-links a {
            text-decoration: none;
            color: var(--text-color);
            font-weight: 600;
            transition: color 0.3s ease;
        }

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

        /* === HERO (ANA EKRAN) === */
        #hero {
            min-height: 100vh; /* Tüm ekranı kapla */
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding-top: 80px; /* Header yüksekliği kadar boşluk */
            background: linear-gradient(rgba(13, 17, 23, 0.8), rgba(13, 17, 23, 1)), url('https://images.unsplash.com/photo-1517694712202-14dd9538aa97?crop=entropy&cs=tinysrgb&fit=max&fm=jpg&ixid=M3w0NTMzNXwwfDF8c2VhcmNofDEzfHx0ZWNobm9sb2d5JTJDYWJzdHJhY3R8ZW58MHx8fHwxNzA3OTQxODQxfDA&ixlib=rb-4.0.3&q=80&w=1080') no-repeat center center/cover;
            /* Arka plan resmini değiştirebilirsiniz */
        }

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

        #hero h1 {
            font-size: 3.5rem;
            margin-bottom: 20px;
            line-height: 1.2;
        }

        #hero h1 span {
            background: -webkit-linear-gradient(45deg, var(--primary-color), #81C784);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        #hero p {
            font-size: 1.2rem;
            margin-bottom: 30px;
            font-weight: 300;
        }

        .cta-button {
            background-color: var(--primary-color);
            color: var(--header-text);
            padding: 15px 35px;
            text-decoration: none;
            font-weight: 600;
            border-radius: 50px; /* Modern yuvarlak kenar */
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(74, 144, 226, 0.3);
        }

        .cta-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(74, 144, 226, 0.5);
        }
        
        /* === HAKKIMIZDA BÖLÜMÜ === */
        #about {
            background-color: var(--card-bg);
            text-align: center;
        }
        #about p {
            max-width: 800px;
            margin: 0 auto;
            font-size: 1.1rem;
        }

        /* === HİZMETLER BÖLÜMÜ === */
        #services {
            background-color: var(--dark-bg);
        }

        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
            margin-top: 50px;
        }

        .service-card {
            background-color: var(--card-bg);
            padding: 40px;
            border-radius: 10px;
            border: 1px solid var(--border-color);
            transition: all 0.3s ease;
        }

        .service-card:hover {
            transform: translateY(-10px);
            border-color: var(--primary-color);
            box-shadow: 0 10px 30px rgba(74, 144, 226, 0.1);
        }

        .service-card .icon {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }

        .service-card h3 {
            font-size: 1.5rem;
        }

        .service-card p {
            font-size: 0.95rem;
        }

        /* === PROJELER (PORTFOLYO) BÖLÜMÜ === */
        #portfolio {
            background-color: var(--card-bg);
        }

        .portfolio-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 30px;
            margin-top: 50px;
        }

        .portfolio-item {
            background-color: var(--dark-bg);
            border-radius: 10px;
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
            transition: transform 0.3s ease;
        }
        
        .portfolio-item:hover {
             transform: scale(1.03);
        }

        .portfolio-item img {
            width: 100%;
            height: 220px;
            object-fit: cover;
            display: block;
        }

        .portfolio-content {
            padding: 25px;
        }

        .portfolio-content h3 {
            font-size: 1.3rem;
            color: var(--primary-color);
        }

        .portfolio-content p {
            font-size: 0.9rem;
            margin-bottom: 15px;
        }

        .portfolio-tag {
            display: inline-block;
            background-color: var(--border-color);
            color: var(--text-color);
            padding: 5px 10px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-right: 8px;
            margin-bottom: 8px;
        }

        /* === İLETİŞİM BÖLÜMÜ === */
        #contact {
            text-align: center;
        }

        #contact p {
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto 40px auto;
        }

        .contact-cards-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-top: 50px;
        }

        .contact-card {
            background-color: var(--card-bg);
            padding: 30px;
            border-radius: 10px;
            border: 1px solid var(--border-color);
            transition: all 0.3s ease;
            text-decoration: none; /* Link olduğu için */
            color: var(--text-color); /* Link rengini düzelt */
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }
        
        .contact-card:hover {
            transform: translateY(-10px);
            border-color: var(--primary-color);
            box-shadow: 0 10px 30px rgba(74, 144, 226, 0.1);
        }

        .contact-card .icon {
            font-size: 3.5rem;
            margin-bottom: 15px;
            color: var(--primary-color);
        }
        
        .contact-card.whatsapp .icon { color: #25D366; }
        .contact-card.instagram .icon { 
            background: linear-gradient(45deg, #f09433 0%,#e6683c 25%,#dc2743 50%,#cc2366 75%,#bc1888 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .contact-card.mail .icon { color: #EA4335; }


        .contact-card h3 {
            font-size: 1.4rem;
            margin-bottom: 5px;
            color: var(--header-text);
        }

        .contact-card p {
            font-size: 1rem;
            margin: 0;
            max-width: 100%; /* İçeriği sıkıştırmamak için */
        }


        /* === FOOTER === */
        .footer {
            background-color: var(--card-bg);
            text-align: center;
            padding: 40px 0;
            border-top: 1px solid var(--border-color);
        }

        .footer p {
            font-size: 0.9rem;
        }

        /* === MOBİL UYUMLULUK === */
        @media (max-width: 768px) {
            .nav-links {
                /* Basit mobil menü (daha gelişmişi JS gerektirir) */
                display: none; 
            }

            #hero h1 {
                font-size: 2.5rem;
            }
            #hero p {
                font-size: 1rem;
            }

            h2 {
                font-size: 2rem;
            }
            
            .contact-cards-grid {
                grid-template-columns: 1fr;
            }
        }
        
        /* === JS İLE EKLENECEK ANİMASYON SINIFI === */
        /* Öğelerin ekran göründüğünde gelmesi için */
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s ease-out, transform 0.6s ease-out;
        }

        .fade-in.is-visible {
            opacity: 1;
            transform: translateY(0);
        }