/* --- TEMEL AYARLAR VE RENK PALETİ --- */
:root {
    --primary-color: #0d47a1; /* Kurumsal Güven Veren Mavi */
    --secondary-color: #ff6d00; /* Dikkat Çekici Turuncu (Dönüşüm Odaklı) */
    --text-dark: #333333;
    --text-light: #666666;
    --bg-light: #f8f9fa;
    --white: #ffffff;
    --whatsapp-green: #25d366;
    --transition: all 0.3s ease;
}

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

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

a { text-decoration: none; color: inherit; }
ul { list-style: none; }

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

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* --- BUTONLAR --- */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 5px;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    text-align: center;
}

.btn-primary {
    background-color: var(--secondary-color);
    color: var(--white);
}
.btn-primary:hover { background-color: #e66000; transform: translateY(-2px); }

.btn-secondary {
    background-color: transparent;
    border: 2px solid var(--white);
    color: var(--white);
}
.btn-secondary:hover { background-color: var(--white); color: var(--primary-color); }

.btn-whatsapp { background-color: var(--whatsapp-green); color: var(--white); }
.btn-whatsapp:hover { background-color: #20bd5a; }

/* --- HEADER VE ÜST BANT --- */
.top-bar {
    background-color: #0a357a;
    color: var(--white);
    padding: 8px 0;
    font-size: 0.9rem;
}
.top-bar a { margin-right: 15px; transition: var(--transition); }
.top-bar a:hover { color: var(--secondary-color); }

.main-header {
    background-color: var(--white);
    padding: 15px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.main-nav ul { display: flex; gap: 20px; }
.main-nav a { font-weight: 600; color: var(--primary-color); transition: var(--transition); }
.main-nav a:hover { color: var(--secondary-color); }

/* --- HERO BÖLÜMÜ (Karşılama Ekranı) --- */
.hero {
    background: linear-gradient(rgba(13, 71, 161, 0.8), rgba(13, 71, 161, 0.8)), url('../images/hero-bg.jpg') center/cover no-repeat;
    color: var(--white);
    padding: 100px 0;
    text-align: center;
}
.hero h1 { font-size: 3rem; margin-bottom: 20px; line-height: 1.2; }
.hero h1 span { color: var(--secondary-color); }
.hero p { font-size: 1.2rem; margin-bottom: 30px; max-width: 800px; margin-left: auto; margin-right: auto; }
.hero-buttons { display: flex; gap: 15px; justify-content: center; }

/* --- ÜRÜN KARTLARI (VİTRİN) --- */
.section-title { text-align: center; margin: 60px 0 40px; }
.section-title h2 { font-size: 2.2rem; color: var(--primary-color); }

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}
.product-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    transition: var(--transition);
}
.product-card:hover { transform: translateY(-5px); box-shadow: 0 8px 25px rgba(0,0,0,0.1); }
.product-image img { width: 100%; height: 250px; object-fit: cover; }
.product-info { padding: 20px; }
.product-info .model-code { font-size: 0.8rem; color: var(--text-light); font-weight: bold; }
.product-info h3 { font-size: 1.2rem; margin: 10px 0; color: var(--primary-color); }
.product-info .capacity { margin-bottom: 15px; font-weight: 600; }

/* --- YÜZEN WHATSAPP BUTONU --- */
.floating-whatsapp {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: var(--whatsapp-green);
    color: var(--white);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 30px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    z-index: 1000;
    transition: var(--transition);
}
.floating-whatsapp:hover { transform: scale(1.1); }

/* --- MOBİL UYARLAMA --- */
@media (max-width: 768px) {
    .hero h1 { font-size: 2rem; }
    .main-nav ul { display: none; /* Mobil menü JS ile eklenecek */ }
    .hero-buttons { flex-direction: column; }
    .flex-between { flex-direction: column; text-align: center; gap: 10px; }
}