/* ============================================================
   1. GENEL AYARLAR & DEĞİŞKENLER
   ============================================================ */
:root {
    --ana-renk: #dc3545;       /* Kurumsal Kırmızı */
    --koyu-renk: #0f0f0f;      /* Derin Siyah */
    --yazi-rengi: #333;
    --beyaz: #ffffff;
    --gri-bg: #f8f9fa;
    --gecis: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
    --premium-shadow: 0 10px 30px rgba(0,0,0,0.08);
}

body { 
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; 
    color: var(--yazi-rengi); 
    background-color: var(--beyaz);
    overflow-x: hidden;
    line-height: 1.6;
}

/* ============================================================
   2. HEADER (Sticky & Beyaz Arka Plan)
   ============================================================ */
.navbar { 
    position: sticky !important;
    top: 0;
    z-index: 1050;
    background-color: var(--beyaz) !important; /* Takip ederken her zaman beyaz */
    box-shadow: 0 4px 12px rgba(0,0,0,0.1); 
    padding: 15px 0;
    transition: var(--gecis);
}

.nav-link { 
    font-weight: 700; 
    text-transform: uppercase; 
    color: var(--koyu-renk) !important; 
    font-size: 14px;
    letter-spacing: 0.5px;
}

.nav-link:hover, .nav-link.active { 
    color: var(--ana-renk) !important; 
}

/* Mega Menü Ayarları */
.dropdown-menu {
    border: none;
    border-radius: 0 0 15px 15px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
}

/* ============================================================
   3. HERO SECTION & WHATSAPP (Sabit & Canlanmayan)
   ============================================================ */
.hero-section {
    position: relative;
    overflow: hidden;
    z-index: 1;
}

/* İstediğin kararmayan, yeşil ve sabit buton */
.btn-hero-whatsapp {
    background-color: #25d366 !important;
    color: var(--beyaz) !important;
    border: none !important;
    padding: 15px 35px !important;
    border-radius: 50px !important;
    font-weight: 700 !important;
    display: inline-flex;
    align-items: center;
    transition: none !important; /* Canlanma/Animasyon efektlerini kapatır */
    opacity: 1 !important;
    visibility: visible !important;
}

.btn-hero-whatsapp:hover {
    background-color: #25d366 !important; /* Üzerine gelince kararma yapmaz */
    transform: none !important; /* Hareket etmez */
    color: var(--beyaz) !important;
    box-shadow: 0 5px 15px rgba(37, 211, 102, 0.3) !important;
}

/* ============================================================
   4. ÜRÜN KARTLARI (Premium Tasarım)
   ============================================================ */
.product-card {
    border-radius: 15px !important;
    transition: var(--gecis);
    border: 1px solid #eee !important;
    background: var(--beyaz);
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--premium-shadow) !important;
    border-color: var(--ana-renk) !important;
}

.product-card img {
    transition: transform 0.6s ease;
}

.product-card:hover img {
    transform: scale(1.08);
}

.section-title {
    position: relative;
    padding-bottom: 15px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 4px;
    background-color: var(--ana-renk);
}

/* ============================================================
   5. MARKALAR SLIDER (Sürekli ve Yavaş Kayma)
   ============================================================ */
.brandSlider .swiper-wrapper {
    transition-timing-function: linear !important; /* Akışı pürüzsüz yapar */
}

.brand-card img {
    filter: grayscale(100%);
    opacity: 0.6;
    transition: 0.3s;
}

.brand-card:hover img {
    filter: grayscale(0%);
    opacity: 1;
}

/* ============================================================
   6. FOOTER & DİĞER
   ============================================================ */
footer { 
    background: var(--koyu-renk) !important; 
    color: var(--beyaz); 
    padding: 70px 0 30px; 
}

.fixed-whatsapp-icon {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 1000;
    background: #25d366;
    color: white;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

@media (max-width: 991px) {
    .hero-section h1 { font-size: 2.5rem; }
}