body {
    font-family: 'Inter', sans-serif;
    color: #333;
    background-color: #f4f7f6;
}

.main-content-section {
    margin-top: 120px;
    padding-bottom: 60px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
}

.sertifika-liste-kapsayici {
    width: 90%;
    max-width: 900px;
    padding: 30px;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(8px);
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(224, 224, 224, 0.5);
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.box-header {
    width: 100%;
    background-color: transparent;
    padding: 18px 30px;
    border-bottom: 1px solid rgba(224, 230, 236, 0.7);
    text-align: center;
    border-radius: 12px 12px 0 0;
    box-shadow: none;
    margin-top: -30px;
    margin-left: -30px;
    margin-right: -30px;
    margin-bottom: 25px;
}

.box-header h2 {
    font-size: 1.6em;
    font-weight: 600;
    color: #000000;
    margin: 0;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    font-family: 'Inter', sans-serif;
}

.sertifika-listesi {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.sertifika-item {
    display: flex;
    align-items: center;
    padding: 15px 0;
    border-bottom: 1px solid rgba(240, 240, 240, 0.7);
    transition: background-color 0.3s ease;
}

.sertifika-item:last-child {
    border-bottom: none;
}

.sertifika-item:hover {
    background-color: rgba(252, 252, 252, 0.7);
}

.sertifika-logo {
    flex-shrink: 0;
    width: 110px;
    height: 110px;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px solid rgba(229, 231, 235, 0.7);
    border-radius: 8px;
    margin-right: 20px;
    overflow: hidden;
    background-color: rgba(255, 255, 255, 0.9);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.sertifika-logo img {
    max-width: 80%;
    max-height: 80%;
    object-fit: contain;
}

.sertifika-bilgi {
    flex-grow: 1;
    margin-right: 20px;
}

.sertifika-bilgi h3 {
    font-size: 1.2em;
    font-weight: 600;
    color: #3f556a;
    margin-bottom: 5px;
    line-height: 1.3;
}

.sertifika-bilgi p {
    font-size: 0.9em;
    color: #555;
    line-height: 1.5;
}

.sertifika-pdf-indirme {
    flex-shrink: 0;
}

.sertifika-pdf-indirme a {
    background-color: rgba(255, 255, 255, 0.3);
    color: #555;
    border: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1),
                0 -1px 2px rgba(255, 255, 255, 0.7) inset;
    border-radius: 20px;
}

.sertifika-pdf-indirme a:hover {
    background-color: rgba(137, 207, 240, 0.1);
    color: #444;
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.15),
                0 -1px 2px rgba(255, 255, 255, 0.8) inset;
}

@media (max-width: 768px) {
    .main-content-section {
        margin-top: 110px;
        padding-bottom: 40px;
    }

    .sertifika-liste-kapsayici {
        padding: 20px;
        width: 95%;
    }

    .box-header {
        margin-top: -20px;
        margin-left: -20px;
        margin-right: -20px;
        padding: 15px 20px;
    }

    .box-header h2 {
        font-size: 1.3em;
    }

    .sertifika-item {
        flex-wrap: wrap;
        justify-content: center;
        text-align: center;
        padding: 15px 0;
    }

    .sertifika-logo {
        margin-right: 0;
        margin-bottom: 10px;
        width: 30%;
    }

    .sertifika-bilgi {
        margin-right: 0;
        margin-bottom: 15px;
    }

    .sertifika-pdf-indirme a {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .box-header h2 {
        font-size: 1.2em;
    }
    .sertifika-logo {
        margin-right: 0;
        margin-bottom: 10px;
        width: 35%;
    }
    .sertifika-bilgi h3 {
        font-size: 1.1em;
    }
    .sertifika-bilgi p {
        font-size: 0.85em;
    }
}