body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #F7F8FA;
    color: #222;
}
header.banner {
    background: #c5ccd7;
    color: white;
    text-align: center;
    padding: 0;
    margin: 0;
    position: relative;
    display: flex;
    align-items: stretch;
    justify-content: center;
    height: auto;
    min-height: unset;
    overflow: hidden;
}
header.banner .logo {
    width: 100%;
    max-width: 100%;
    height: auto;
    max-height: none;
    object-fit: unset;
    object-position: unset;
    display: block;
    margin: 0;
}
header.banner .banner-overlay {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    z-index: 2;
    max-width: 70%;
    max-height: 70%;
    width: auto;
    height: auto;
    pointer-events: none;
    /* Gerekirse aşağıya box-shadow veya filtre eklenebilir */
}
@media (max-width: 700px) {
    header.banner {
        min-height: 180px;
        height: 180px;
    }
    header.banner .banner-overlay {
        max-width: 95%;
        max-height: 48%;
    }
}
@media (min-width: 1000px) {
    header.banner {
        min-height: 400px;
    }
    header.banner .logo {
        max-height: 400px;
    }
}
.logo {
    width: 100%;
    max-width: 600px;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 0 10px #135caa77;
    margin-bottom: 10px;
}
nav {
    background: #135caa;
    position: sticky;
    top: 0;
    z-index: 999; 
}
nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
}
nav ul li {
    margin: 0 20px;
}
nav ul li a {
    color: white;
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    padding: 1rem 0.5rem;
    display: block;
    transition: color 0.2s;
}
nav ul li a:hover {
    color: #ffd600;
}
section {
    padding: 2.5rem 1rem 1.5rem 1rem;
    max-width: 900px;
    margin: 0 auto;
}
.galeri-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1.25rem;
    margin-top: 1.5rem;
}
.galeri-grid img {
    width: 100%;
    border-radius: 10px;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 12px rgba(30, 90,170,0.08);
}
.galeri-grid img:hover {
    transform: scale(1.04) rotate(-2deg);
    box-shadow: 0 6px 24px #1976d244;
    cursor: pointer;
    z-index: 2;
}

/* Lightbox arka planı ve büyük görsel alanı */
.lightbox {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0; top: 0;
    width: 100vw; height: 100vh;
    background: rgba(255, 255, 255, 0.97);
    justify-content: center;
    align-items: center;
    transition: all 0.2s;
}
.lightbox.show {
    display: flex;
}
.lightbox img {
    max-width: 92vw;
    max-height: 90vh;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 10px 44px #135caa49;
    object-fit: contain;
}
.lightbox-close {
    position: absolute;
    top: 32px;
    right: 48px;
    font-size: 46px;
    color: #1976d2;
    cursor: pointer;
    z-index: 10000;
    font-weight: 600;
}
.lightbox-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 3rem;
    color: #1976d2;
    background: rgba(255,255,255,0.73);
    border-radius: 50%;
    box-shadow: 0 2px 14px #135caa23;
    padding: 0.15em 0.45em;
    cursor: pointer;
    z-index: 10001;
    user-select: none;
}
.lightbox-arrow-left { left: 32px; }
.lightbox-arrow-right { right: 32px; }
@media (max-width: 700px) {
    nav ul {
        flex-direction: column;
        align-items: center;
    }
    nav ul li {
        margin: 7px 0;
    }
    .galeri-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    }
    header.banner {
        min-height: 180px;
    }
    section {
        padding-left: 0.2rem;
        padding-right: 0.2rem;
    }
    .lightbox-close {
        top: 12px;
        right: 16px;
        font-size: 38px;
    }
    .lightbox-arrow {
        font-size: 2.1rem;
        left: 12px;
        right: 12px;
    }
    .lightbox-arrow-left { left: 8px; }
    .lightbox-arrow-right { right: 8px; }
}
.contact-info a {
    color: #1976d2;
    text-decoration: underline;
}
footer {
    text-align: center;
    padding: 1.4rem 0 1rem 0;
    background: #135caa;
    color: #fff;
    margin-top: 2rem;
}