/* ==========================================================================
   MAIN STYLES (Header, Footer, specific sections)
   ========================================================================== */

/* Header & Navigation */
header {
    position: fixed; /* 'absolute' yerine 'fixed' yaparak sticky (yapışkan) hale getirdik */
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    padding: var(--spacing-xs) 0;
    background-color: var(--white);
    border-bottom: 2px solid var(--primary-blue);
    transition: background-color 0.3s ease, backdrop-filter 0.3s ease;
}

/* Sayfa aşağı kaydırıldığında eklenecek sınıf */
header.header-scrolled {
    background-color: rgba(255, 255, 255, 0.7); /* Transparan görünüm */
    backdrop-filter: blur(10px); /* Şık bir blur efekti */
}

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

.logo img {
    height: 117px; /* Logoyu %30 büyüttük (90px -> 117px) */
    width: auto;
    transform: scale(1.1); /* Header alanını genişletmeden görsel olarak %10 daha büyütüldü */
    transform-origin: left center; /* Büyürken sola hizalı kalmasını sağladık */
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), filter 0.4s ease;
    animation: intermittentShine 6s infinite;
}

@keyframes intermittentShine {
    0%, 85% {
        filter: drop-shadow(0 0 0 rgba(255,255,255,0)) brightness(1);
    }
    92% {
        filter: drop-shadow(0 0 12px var(--primary-blue)) brightness(1.2);
    }
    100% {
        filter: drop-shadow(0 0 0 rgba(255,255,255,0)) brightness(1);
    }
}

.logo img:hover {
    transform: scale(1.18);
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.1));
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.nav-links a:not(.btn) {
    position: relative; /* Alt çizgi pozisyonlandırması için */
    text-decoration: none;
    color: var(--primary-blue);
    font-family: var(--font-primary);
    font-weight: 700;
    font-size: 0.95rem;
    text-transform: uppercase;
    text-shadow: 0 0 8px rgba(255, 255, 255, 0.9); /* Arkaplan koyu gelirse diye beyaz ince gölge */
    transition: color 0.3s ease; /* Hover için yumuşak geçişi koruyoruz */
}

/* Hover alt çizgi animasyonu (başlangıçta genişlik 0) */
.nav-links a:not(.btn)::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -6px; /* Yazının hemen altında */
    left: 0;
    background-color: var(--primary-blue); /* Mavi çizgi */
    transition: width 0.3s ease; /* Genişleme animasyonu */
}

.nav-links a:not(.btn):hover {
    color: var(--secondary-blue);
}

/* Language Switcher */
.lang-switcher {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    color: var(--gray-400);
    font-size: 0.9rem;
    font-weight: 700;
}

.lang-btn {
    position: relative;
    color: var(--gray-500);
    text-decoration: none;
    transition: color 0.3s ease;
}

.lang-btn::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px; /* Yazının hemen altında */
    left: 0;
    background-color: var(--primary-blue);
    transition: width 0.3s ease;
}

.lang-btn:hover {
    color: var(--primary-blue-hover);
}

.lang-btn.active {
    color: var(--primary-blue);
}

.lang-btn:hover::after,
.lang-btn.active::after {
    width: 100%;
}

/* Language Change Animation */
.lang-transition {
    transition: opacity 0.2s ease-in-out;
}

.lang-fade {
    opacity: 0;
}

/* Hover anında çizginin genişliği %100 olur */
.nav-links a:not(.btn):hover::after {
    width: 100%;
}

@keyframes imageFadeZoom {
    0% {
        opacity: 0;
        transform: scale(1.05);
    }
    100% {
        opacity: 0.5;
        transform: scale(1);
    }
}

/* Hero Section */
.hero {
    min-height: 90vh; 
    padding-top: 180px; 
    position: relative;
    display: flex;
    align-items: center;
    justify-content: flex-start; /* Sola yaslandı */
    text-align: left; /* Sola yaslandı */
    background-color: var(--gray-900); /* Dark background for better contrast */
    overflow: hidden; /* Fotoğraf büyüdüğünde taşmaması için */
}

/* Hero Background Slider */
.hero-bg-slider {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-bg-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0;
    transition: opacity 1.5s ease-in-out;
}

.hero-bg-slide.active {
    opacity: 0.6; /* Orijinal saydamlık seviyesi */
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, rgba(255,255,255,0.9) 0%, rgba(255,255,255,0.4) 50%, rgba(255,255,255,0) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    width: 100%;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-size: 4.5rem; /* Başlığı büyüttük */
    font-weight: 800;
    color: var(--white);
    line-height: 1.1;
    margin-bottom: var(--spacing-xl);
    text-shadow: 0 4px 20px rgba(0,0,0,0.3); /* Okunabilirliği artırmak için gölgeyi güçlendirdik */
    opacity: 0;
    animation: fadeInUp 1s ease-out forwards;
}

.hero-content .btn-primary {
    opacity: 0;
    animation: fadeInUp 1s ease-out 0.4s forwards;
}

/* Footer Section */
footer {
    background-color: var(--primary-blue);
    color: var(--white);
    padding: var(--spacing-3xl) 0 var(--spacing-lg) 0;
    position: relative;
    overflow: hidden;
}

.footer-wave {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 150px;
    background-image: url('../img/Welle_footer.png');
    background-size: 100% 100%;
    background-repeat: no-repeat;
    z-index: 1;
}

/* Scroll to Top Button */
.scroll-top-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-blue);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    opacity: 0;
    pointer-events: none;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 99;
}

.scroll-top-btn.show {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.scroll-top-btn:hover {
    background-color: var(--primary-blue-hover);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* Reveal on Scroll Animation */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s ease-out;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* =========================================
   RESPONSIVE (Mobile & Tablet)
   ========================================= */

.mobile-only {
    display: none !important;
}

.hamburger {
    display: none;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
    z-index: 1000;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--gray-900);
    transition: all 0.3s ease;
}

.header-scrolled .hamburger span {
    background-color: var(--primary-blue);
}

@media (max-width: 992px) {
    .navbar {
        justify-content: space-between;
    }
    
    .hamburger {
        display: flex;
        order: 1;
    }

    .logo {
        order: 2;
        margin-left: auto;
    }
    
    .logo img {
        transform-origin: right center;
    }
    
    nav {
        order: 3;
    }
    
    .nav-action.desktop-only {
        display: none !important;
    }

    .mobile-only {
        display: flex !important;
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }

    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--white);
        flex-direction: column;
        align-items: center;
        gap: 1.5rem;
        padding: 2rem 0;
        box-shadow: 0 10px 15px rgba(0,0,0,0.1);
        transform: translateY(-150%);
        opacity: 0;
        pointer-events: none;
        transition: all 0.4s ease;
        z-index: -1;
    }
    

    .nav-links.nav-active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }
    
    .hamburger.toggle span:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }
    .hamburger.toggle span:nth-child(2) {
        opacity: 0;
    }
    .hamburger.toggle span:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }
    
    .hero {
        padding-top: 130px;
        min-height: 80vh;
    }
    
    .hero-title {
        font-size: 2.8rem;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .stats-card h2 {
        font-size: 2.5rem;
    }
    
    .footer-wave {
        height: 60px;
    }
}