.top-header {
    background-color: #ffffff;
    border-bottom: 1px solid #e9ecef;
    padding: 40px 0;
}

.header-content {
    display: flex;
    justify-content: space-between;
}

.title-section h1 {
    font-size: 3.5rem;
    font-weight: 300;
    color: #333;
    margin-bottom: 8px;
}

.title-section h2 {
    font-size: 1.5rem;
    color: #666;
    font-weight: 400;
}

.issn-section {
    text-align: right;
    color: #666;
    font-size: 0.85rem;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.issn-info {
    margin-bottom: auto;
    text-align: left;
}

.learn-more-btn {
    background: linear-gradient(135deg, #007bff, #0056b3);
    color: white;
    padding: 10px 24px;
    border-radius: 25px;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-block;
    box-shadow: 0 2px 8px rgba(0,123,255,0.2);
}

.learn-more-btn:hover {
    background: linear-gradient(135deg, #0056b3, #004085);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,123,255,0.3);
}

/* Responsive adjustments for header */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .title-section {
        margin-bottom: 20px;
    }

    .issn-section {
        align-items: center;
        text-align: center;
    }

    .issn-info {
        margin-bottom: 15px;
    }
}

.description-section {
    margin-top: 30px;
    background-color: #f8f9fa;
    padding: 30px;
    border-radius: 12px;
    border: 1px solid #e9ecef;
}

.intro-image {
    position: relative;
    padding-top: 135.71%;
    width: 100%;
    overflow: hidden;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    background: linear-gradient(135deg, #007bff, #0056b3);
}

.intro-image > img {
    position: absolute;
    top: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Responsive layout for intro section */
@media (max-width: 768px) {

    .description-section .col-md-2,
    .description-section .col-md-10 {
        margin-bottom: 20px;
    }
}

.bottom-section {
    padding: 40px 0;
    background-color: #fff;
}

.sidebar {
    background-color: #ffffff;
    border-right: 1px solid #e9ecef;
}

.issue-nav {
    background-color: #f8f9fa;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 30px;
    border: 1px solid #e9ecef;
}

.nav-header {
    margin-bottom: 20px;
}

.nav-title {
    color: #333;
    font-weight: 600;
    font-size: 1.1rem;
}

.year-item {
    padding: 12px 20px;
    margin: 4px 0;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-weight: 600;
}

.year-item:hover {
    background-color: #e3f2fd;
    transform: translateX(5px);
}

.year-item.active {
    background-color: #007bff;
    color: white;
    box-shadow: 0 2px 8px rgba(0,123,255,0.3);
}

.year-item a {
    text-decoration: none;
    color: inherit;
}

.journal-info {
    background-color: #f8f9fa;
    border-radius: 12px;
    padding: 20px;
    border: 1px solid #e9ecef;
}

.journal-info h6 {
    color: #333;
    font-weight: 600;
    margin-bottom: 15px;
}

.info-item {
    margin-bottom: 10px;
    font-size: 0.9rem;
    line-height: 1.5;
}

.info-item strong {
    color: #555;
}

/* Section 3 - Magazine Covers */
.covers-section {
}

.magazine-cover {
    transition: all 0.3s ease;
    cursor: pointer;
    margin-bottom: 30px;
    background-color: #ffffff;
    border-radius: 15px;
    padding: 15px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    border: 1px solid #f0f0f0;
}

.magazine-cover:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.15);
    border-color: #007bff;
}


.cover-image-wrap {
    position: relative;
    padding-top: 135.71%;
    object-fit: cover;
    border-radius: 10px;
    transition: all 0.3s ease;
    background-color: #f8f9fa;
}

.cover-image {
    position: absolute;
    top: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 10px;
    transition: all 0.3s ease;
}

.magazine-cover:hover .cover-image {
    transform: scale(1.02);
}

.issue-info {
    text-align: center;
    margin-top: 15px;
}

.issue-title {
    font-weight: 600;
    color: #333;
    font-size: 1rem;
    margin-bottom: 5px;
}

.issue-subtitle {
    color: #666;
    font-size: 0.85rem;
    line-height: 1.4;
}