/* --- CSS DEĞİŞKENLERİ (Sürdürülebilirlik İçin) --- */
:root {
    --primary-color: #2c3e50;
    --accent-color: #e67e22;
    --text-light: #ffffff;
    --text-dark: #333333;
    --overlay-dark: rgba(0, 0, 0, 0.7);
    --overlay-light: rgba(0, 0, 0, 0.2);
    --transition-speed: 0.5s;
    --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-heading: "Playfair Display", serif; /* Premium bir hava için */
}

/* --- RESET VE TEMEL AYARLAR --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-main);
    color: var(--text-dark);
    background-color: #f8f9fa;
    overflow-x: hidden;
    width: 100vw;
    -webkit-font-smoothing: antialiased;
}

/* --- HEADER (Üst Bilgi) --- */
#main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: rgba(255, 255, 255, 1);
    z-index: 1000;
    transition: all var(--transition-speed) cubic-bezier(0.4, 0, 0.2, 1);
    /* Performans optimizasyonu: Sadece değişecek özellikleri GPU'ya bildiriyoruz */
    will-change: height, background-color, backdrop-filter;
}

.logo {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    transition: transform var(--transition-speed) ease;
    will-change: transform;
}

/* JS ile eklenecek 'shrink' class'ı */
#main-header.shrink {
    height: 60px;
    background-color: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px); /* Safari desteği */
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

#main-header.shrink .logo {
    transform: scale(0.7);
}

/* --- HERO ALANI --- */
.hero-section {
    padding-top: 150px;
    padding-bottom: 50px;
    text-align: center;
    background-color: #f8f9fa;
}

.hero-section h1 {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 4rem); /* Responsive Tipografi */
    color: var(--primary-color);
    letter-spacing: -1px;
}

/* --- KATEGORİ SÜTUNLARI (GRID) --- */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    width: 100%;
    /* Alt boşluk sticky footer'ın arkasında kalmamak için */
    padding-bottom: 100px; 
}

.cat-item {
    position: relative;
    height: 70vh; /* Masaüstü varsayılan yükseklik */
    background-size: cover;
    background-position: center;
    overflow: hidden;
    cursor: pointer;
}

/* Örnek Görseller (Kendi görsellerinle değiştirmelisin) */
.cat-1 { background-image: url(maket.jpg); }
.cat-2 { background-image: url(party.jpg); }
.cat-3 { background-image: url(sticker.jpg); }
.cat-4 { background-image: url(diy.jpg); }

/* Görsel Karartma Katmanı (Overlay) */
.cat-item::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--overlay-dark);
    transition: background var(--transition-speed) ease;
    z-index: 1;
}

.cat-content {
    position: relative;
    z-index: 2;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 2rem;
}

.cat-content h2 {
    color: var(--text-light);
    font-size: 2rem;
    margin-bottom: 1.5rem;
    transition: transform var(--transition-speed) ease;
    will-change: transform;
}

.btn-detail {
    background-color: transparent;
    color: var(--text-light);
    border: 2px solid var(--text-light);
    padding: 12px 24px;
    font-size: 1rem;
    cursor: pointer;
    border-radius: 30px;
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-speed) ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Hover Efektleri */
.cat-item:hover::before {
    background: var(--overlay-light);
}

.cat-item:hover .cat-content h2 {
    transform: translateY(-15px);
}

.cat-item:hover .btn-detail {
    opacity: 1;
    transform: translateY(0);
}

.btn-detail:hover {
    background-color: var(--text-light);
    color: var(--text-dark);
}

/* --- STICKY FOOTER --- */
.sticky-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(0,0,0,0.1);
    z-index: 900;
    padding: 15px;
    display: flex;
    justify-content: center;
    box-shadow: 0 -4px 10px rgba(0,0,0,0.05);
}

.mobile-contact { display: none; } /* Masaüstünde gizli */

.desktop-contact { display: block; }

.btn-footer {
    padding: 12px 30px;
    border-radius: 25px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: none;
    font-size: 1rem;
    transition: transform 0.3s ease;
}

.btn-footer:hover { transform: scale(1.05); }

.desktop-contact-btn {
    background-color: var(--primary-color);
    color: var(--text-light);
}

/* --- SUB-FOOTER --- */
.sub-footer {
    text-align: center;
    padding: 20px;
    font-size: 0.8rem;
    color: #888;
    background-color: #f8f9fa;
    /* Sticky footer'ın altında görünmesi için margin */
    margin-bottom: 70px; 
}

/* --- POPUP (MODAL) SİSTEMİ --- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
    z-index: 2000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background: #fff;
    padding: 40px;
    border-radius: 15px;
    width: 90%;
    max-width: 500px;
    position: relative;
    transform: scale(0.9);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}

.modal-overlay.active .modal-content {
    transform: scale(1);
}

.close-modal {
    position: absolute;
    top: 15px;
    right: 20px;
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: #666;
    transition: color 0.3s;
}

.close-modal:hover { color: var(--text-dark); }

.modal-content h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
    font-size: 1.8rem;
}

.modal-content p {
    line-height: 1.6;
    color: #555;
}

/* İletişim Modal İçin Özel Tasarım */
.contact-info p { margin-bottom: 10px; font-size: 1.1rem; }
.contact-info a { color: var(--accent-color); text-decoration: none; font-weight: 600;}

/* --- RESPONSIVE TASARIM (Mobil Uyum) --- */
@media (max-width: 768px) {
    .categories-grid {
        grid-template-columns: 1fr;
    }

    .cat-item {
        min-height: 100vh; /* Mobilde tam ekran */
    }

    /* Mobilde içerik her zaman görünür olsun, sadece efekt basitleşsin */
    .btn-detail {
        opacity: 1;
        transform: translateY(0);
        background-color: rgba(255,255,255,0.2);
    }
    
    .cat-item::before {
        background: rgba(0,0,0,0.5); /* Mobilde okunabilirlik için sabit karartma */
    }

    .cat-item:hover::before { background: rgba(0,0,0,0.4); }
    .cat-item:hover .cat-content h2 { transform: none; }

    /* Alt Bilgi Değişimi */
    .desktop-contact { display: none; }
    
    .mobile-contact {
        display: flex;
        width: 100%;
        gap: 10px;
        justify-content: space-between;
    }

    .btn-footer {
        flex: 1;
        padding: 10px;
        font-size: 0.9rem;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 5px;
        color: #fff;
    }

    .wa-btn { background-color: #25D366; }
    .phone-btn { background-color: var(--primary-color); }
    
    .sub-footer { margin-bottom: 80px; }
    
    /* Mobil Görsel Değişimi Örneği (Kendi görsellerini ekle) */
    /* .cat-1 { background-image: url('mobile-gorsel-1.jpg'); } */
}