/* GENEL STİLLER */
:root {
    --primary-color: #007bff; /* Mavi - Vurgu Rengi */
    --secondary-color: #343a40; /* Koyu Gri - Metin Rengi */
    --background-color: #f8f9fa; /* Açık Gri - Arka Plan */
    --white: #ffffff;
    --dark: #212529;
}

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

body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--secondary-color);
    background-color: var(--white);
}

a {
    text-decoration: none;
    color: var(--primary-color);
}

section {
    padding: 80px 5%;
    text-align: center;
}

h1, h2, h3 {
    margin-bottom: 20px;
    color: var(--dark);
}

/* HEADER VE NAVİGASYON */
.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 5%;
    background-color: var(--white);
    border-bottom: 1px solid #e9ecef;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo {
    font-size: 1.8em;
    font-weight: 700;
    color: var(--dark);
}

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

.main-nav ul li a {
    padding: 10px 15px;
    color: var(--secondary-color);
    font-weight: 500;
    transition: color 0.3s;
}

.main-nav ul li a:hover {
    color: var(--primary-color);
}

.cta-header-btn {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 700;
    transition: background-color 0.3s;
}

.cta-header-btn:hover {
    background-color: #0056b3;
}

/* HERO SECTION (BANNER) */
.hero-section {
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('placeholder-bg.jpg') no-repeat center center/cover; /* Arka plan görseli eklenmeli */
    color: var(--white);
    padding: 150px 5%;
    min-height: 500px;
    display: flex;
    justify-content: center;
    align-items: center;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

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

.hero-content h1 {
    font-size: 3em;
    margin-bottom: 15px;
    color: var(--white);
}

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

.hero-cta-btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--white);
    padding: 15px 30px;
    border-radius: 5px;
    font-size: 1.1em;
    font-weight: 700;
    transition: background-color 0.3s;
}

.hero-cta-btn:hover {
    background-color: #0056b3;
}


/* ÜRÜN KARTLARI */
.product-cards-section {
    background-color: var(--background-color);
}

.card-container {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-top: 40px;
}

.product-card {
    background-color: var(--white);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    max-width: 350px;
    transition: transform 0.3s, box-shadow 0.3s;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.card-icon {
    font-size: 3em;
    margin-bottom: 15px;
}

.product-card h3 {
    color: var(--primary-color);
    font-size: 1.5em;
}

.card-link {
    display: inline-block;
    margin-top: 20px;
    font-weight: 700;
}


/* METFİT FARKI (ÖZELLİKLER) */
.features-section {
    background-color: var(--white);
    border-top: 1px solid #e9ecef;
}

.feature-container {
    display: flex;
    justify-content: space-around;
    gap: 20px;
    margin-top: 40px;
}

.feature-item {
    max-width: 300px;
    text-align: center;
}

.feature-icon {
    font-size: 2.5em;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.feature-item h4 {
    font-size: 1.2em;
    color: var(--dark);
    margin-bottom: 10px;
}


/* FOOTER */
footer {
    background-color: var(--dark);
    color: #adb5bd;
    padding: 20px;
    text-align: center;
    font-size: 0.9em;
}

/* RESPONSIVE TASARIM */
@media (max-width: 992px) {
    .card-container, .feature-container {
        flex-direction: column;
        align-items: center;
    }

    .product-card, .feature-item {
        margin-bottom: 20px;
        max-width: 90%;
    }

    .main-nav {
        display: none; /* Basit responsive için navigasyonu gizle */
    }

    .main-header {
        justify-content: center;
    }
}