body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: #111111;
    background-color: #f9f9f9;
    margin: 0;
    padding: 0;
}

/* Header */
header {
    font-size: 0.9rem;
    background-color: #ffffff;
    color: #111111;
}

header i {
    margin-right: 5px;
    color: #c40000;
}

/* Navbar */
.navbar {
    padding: 1rem 0;
    background-color: #ffffff;
}

.navbar-nav .nav-link {
    font-weight: 500;
    color: #111111;
    transition: color 0.3s ease;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    color: #c40000;
}

/* Footer */
footer {
    font-size: 0.95rem;
    background-color: #111111;
    color: #f2f2f2;
}

footer a {
    color: #ccc;
    text-decoration: none;
}

footer a:hover {
    color: #fff;
    text-decoration: underline;
}

/* Responsive Düzenlemeler */
@media (max-width: 767.98px) {
    header .container {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }

    .navbar-brand img {
        height: 40px;
    }

    footer .text-md-right {
        text-align: center !important;
        margin-top: 1rem;
    }

    .references-grid {
        display: grid !important;
        grid-template-columns: 1fr !important;
        gap: 1.3rem !important;
    }

    .reference-logo {
        width: 92vw !important;
        max-width: 300px !important;
        height: 150px !important;
    }

    .reference-logo img {
        max-width: 75%;
        max-height: 38px;
    }
}

.references-page {
    width: 100%;
    padding: 40px 0 60px 0;
    background: #fafbfc;
    min-height: 80vh;
}

.references-grid {
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    /* 3 sütun */
    grid-gap: 40px 30px;
    justify-items: center;
}

.reference-logo {
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 4px 20px 0 rgba(25, 35, 89, 0.07);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 260px;
    height: 160px;
    transition: box-shadow 0.25s, transform 0.22s;
    filter: grayscale(70%) opacity(0.82);
    text-align: center;
    position: relative;
}

.reference-logo:hover {
    box-shadow: 0 8px 28px 0 rgba(50, 50, 89, 0.13);
    transform: translateY(-4px) scale(1.045);
    filter: none;
    z-index: 2;
}

.reference-logo img {
    max-width: 160px;
    max-height: 150px;
    width: auto;
    height: auto;
    object-fit: contain;
    margin: 0 auto;
    transition: filter 0.3s;
    display: block;
}

.page-header {
    background: url('../img/slide3.png') center center / cover no-repeat;
    height: 300px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.page-header .overlay {
    background: rgba(0, 0, 0, 0.5);
    /* karartma efekti */
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.page-header p {
    font-size: 1rem;
    margin: 0;
}