/*İndex Hero Alanı Konteyneri */
        .hero {
            height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            color: white;
            /* Arka plan görseli ve karartma katmanı */
            background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), 
                        url('../assets/images/hero/diffraction-grating-500x500-1-500x380.jpg');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            background-repeat: no-repeat;
            margin: 0;
            padding-top: 70px;
        }

        .hero-content {
            max-width: 800px;
            padding: 0 20px;
        }

        .hero-content h1 {
            font-size: 3.5rem;
            margin-bottom: 20px;
            letter-spacing: 2px;
            text-transform: uppercase;
        }

        .hero-content p {
            font-size: 1.2rem;
            margin-bottom: 30px;
            line-height: 1.6;
            opacity: 0.9;
        }

        /* Buton Tasarımı */
        .hero-button {
            padding: 15px 40px;
            font-size: 1.1rem;
            background-color: #00d2ff;
            color: white;
            border: none;
            border-radius: 50px;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
            font-weight: bold;
        }

        .hero-button:hover {
            background-color: #3a7bd5;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.3);
        }

        /* Mobil Uyumluluk */
        @media (max-width: 768px) {
            .hero-content h1 { font-size: 2.5rem; }
            .hero-content p { font-size: 1rem; }
        }


        .quick-cta {
    padding: 80px 0;
    background: #fdfdfd; /* Footer'dan önce temiz bir ayrım */
    position: relative;
}


/* --- Ürün Gurupları --- */


.products {
    padding: 50px 0; 
    background-color: #fcfcfc;
}

.products h2 {
    text-align: center;
    margin-bottom: 30px;
    font-family: 'Poppins', sans-serif;
    color: #333;
}


.product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}


.product-card {
    background: #fff;
    border: 1px solid #eee; /* Sert çizgiyi yumuşattık */
    border-radius: 12px; /* Köşelere hafif kavis */
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-8px); /* Üstüne gelince kalksın */
    box-shadow: 0 15px 30px rgba(0,0,0,0.1); /* Gölge ile derinlik verdik */
}

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

/* --- Görseldeki Mavi Şeritli Başlık --- */
.product-card h4 {
    background: #eef5f9; /* Görseldeki  açık mavi/gri ton */
    color: #0056b3; 
    padding: 10px 15px;
    margin: 0;
    font-size: 1rem;
    font-family: 'Poppins', sans-serif;
    border-bottom: 1px solid #e0e9f0;
}

.product-card p {
    padding: 15px; /* Yazı kenarlara yapışmasın, ferah dursun */
    font-size: 0.9rem;
    color: #666;
    line-height: 1.4;
    margin: 0;
    flex-grow: 1; /* Alt tarafı hizalamak için */
}

.product-card p a {
    color: #0056b3;
    text-decoration: none;
    font-weight: 600;
    display: block;
    margin-top: 10px;
}
@media (max-width: 1100px) {
    .product-grid {
        grid-template-columns: repeat(3, 1fr); /* Ekran biraz daralınca 3'e düşer */
    }
}
@media (max-width: 850px) {
    .product-grid {
        grid-template-columns: repeat(2, 1fr); /* Tablette 2'ye düşer */
    }
}

@media (max-width: 550px) {
    .product-grid {
        grid-template-columns: 1fr; /* Mobilde tekli liste olur */
    }
}