/*--------------------------------------------------------------
# Article List Page - Professional Design & Enhanced UI
--------------------------------------------------------------*/

/* Page Header Section */
.article-list-header {
    background: linear-gradient(135deg, #106eea 0%, #1976f2 100%);
    color: #fff;
    padding: 25px 20px;
    margin: 10px 0 20px 0;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(16, 110, 234, 0.3);
}

.article-list-header h1 {
    font-size: 28px;
    font-weight: 700;
    margin: 0 0 10px 0;
    color: #fff;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.article-list-header .issue-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: center;
    margin-top: 12px;
}

.article-list-header .issue-meta .meta-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
    background: rgba(255, 255, 255, 0.15);
    padding: 8px 15px;
    border-radius: 6px;
}

.article-list-header .issue-meta .meta-item i {
    font-size: 18px;
}

/* Article Item Card */
.article-item {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 3px 20px rgba(0, 0, 0, 0.08);
    margin-bottom: 20px;
    overflow: hidden;
    transition: all 0.3s ease;
    border: 1px solid #e9ecef;
}

.article-item:hover {
    box-shadow: 0 6px 30px rgba(16, 110, 234, 0.15);
    transform: translateY(-3px);
    border-color: #106eea;
}

/* Article Header */
.article-item .article-header {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 15px 20px;
    border-bottom: 3px solid #106eea;
    cursor: pointer;
    transition: all 0.3s ease;
}

.article-item .article-header:hover {
    background: linear-gradient(135deg, #e9ecef 0%, #dee2e6 100%);
}

.article-item .article-header .article-number {
    display: inline-block;
    background: #106eea;
    color: #fff;
    font-weight: 700;
    font-size: 13px;
    padding: 5px 12px;
    border-radius: 20px;
    margin-right: 10px;
}

.article-item .article-header .article-title {
    font-size: 18px;
    font-weight: 600;
    color: #222;
    margin: 0;
    line-height: 1.5;
    display: inline;
}

.article-item .article-header .expand-icon {
    float: right;
    font-size: 24px;
    color: #106eea;
    transition: transform 0.3s ease;
}

.article-item .article-header .expand-icon.rotated {
    transform: rotate(180deg);
}

/* Article Body */
.article-item .article-body {
    padding: 20px;
}

.article-item .article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid #e9ecef;
}

.article-item .article-meta .meta-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #f8f9fa;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 13px;
    color: #495057;
    border: 1px solid #dee2e6;
}

.article-item .article-meta .meta-badge i {
    color: #106eea;
    font-size: 16px;
}

.article-item .article-meta .meta-badge strong {
    color: #222;
    font-weight: 600;
}

/* Authors Section */
.article-authors {
    background: linear-gradient(135deg, #fff5e6 0%, #ffe4cc 100%);
    padding: 12px 15px;
    border-radius: 8px;
    margin-bottom: 15px;
    border-left: 4px solid #ff9800;
}

.article-authors .authors-label {
    font-weight: 700;
    color: #e67e22;
    font-size: 14px;
    margin-bottom: 6px;
    display: block;
}

.article-authors .authors-list {
    font-size: 15px;
    color: #555;
    font-weight: 500;
    margin: 0;
}

/* Abstract Section */
.article-abstract {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    border-left: 4px solid #28a745;
    margin-bottom: 15px;
}

.article-abstract .abstract-label {
    font-weight: 700;
    color: #28a745;
    font-size: 14px;
    margin-bottom: 8px;
    display: block;
}

.article-abstract .abstract-text {
    font-size: 14px;
    line-height: 1.8;
    color: #555;
    text-align: justify;
    margin: 0;
}

/* Publication Info */
.publication-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    padding-top: 15px;
    border-top: 1px solid #e9ecef;
}

.publication-date {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #6c757d;
    font-size: 14px;
}

.publication-date i {
    color: #106eea;
    font-size: 16px;
}

/* Download Button */
.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, #dc3545 0%, #c82333 100%);
    color: #fff;
    padding: 10px 20px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(220, 53, 69, 0.3);
}

.download-btn:hover {
    background: linear-gradient(135deg, #c82333 0%, #bd2130 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(220, 53, 69, 0.4);
    color: #fff;
    text-decoration: none;
}

.download-btn i {
    font-size: 20px;
}

/* Back Button */
.back-to-issues {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #fff;
    color: #106eea;
    padding: 10px 20px;
    border-radius: 8px;
    border: 2px solid #106eea;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s ease;
    margin-bottom: 20px;
}

.back-to-issues:hover {
    background: #106eea;
    color: #fff;
    text-decoration: none;
    transform: translateX(-5px);
}

.back-to-issues i {
    font-size: 18px;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    background: #f8f9fa;
    border-radius: 12px;
}

.empty-state i {
    font-size: 64px;
    color: #dee2e6;
    margin-bottom: 20px;
}

.empty-state h3 {
    font-size: 24px;
    color: #6c757d;
    margin-bottom: 10px;
}

.empty-state p {
    font-size: 16px;
    color: #adb5bd;
}

/* Article Count Badge */
.article-count-badge {
    background: rgba(255, 255, 255, 0.2);
    padding: 6px 15px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    display: inline-block;
}

/* Responsive Design - Mobile */
@media (max-width: 767px) {
    .article-list-header {
        padding: 20px 15px;
        margin: 8px 0 15px 0;
    }

    .article-list-header h1 {
        font-size: 22px;
        margin-bottom: 12px;
    }

    .article-list-header .issue-meta {
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
    }

    .article-list-header .issue-meta .meta-item {
        font-size: 13px;
        padding: 6px 12px;
        width: 100%;
    }

    .article-item {
        margin-bottom: 15px;
    }

    .article-item .article-header {
        padding: 12px 15px;
    }

    .article-item .article-header .article-title {
        font-size: 16px;
        display: block;
        margin-top: 8px;
    }

    .article-item .article-header .article-number {
        font-size: 12px;
        padding: 4px 10px;
    }

    .article-item .article-header .expand-icon {
        float: none;
        display: block;
        text-align: center;
        margin-top: 10px;
    }

    .article-item .article-body {
        padding: 15px;
    }

    .article-item .article-meta {
        flex-direction: column;
        gap: 8px;
    }

    .article-item .article-meta .meta-badge {
        width: 100%;
        justify-content: flex-start;
        font-size: 12px;
        padding: 8px 12px;
    }

    .article-authors {
        padding: 10px 12px;
    }

    .article-authors .authors-label {
        font-size: 13px;
    }

    .article-authors .authors-list {
        font-size: 14px;
    }

    .article-abstract {
        padding: 12px;
    }

    .article-abstract .abstract-label {
        font-size: 13px;
    }

    .article-abstract .abstract-text {
        font-size: 13px;
        line-height: 1.7;
    }

    .publication-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }

    .publication-date {
        font-size: 13px;
        width: 100%;
    }

    .download-btn {
        width: 100%;
        justify-content: center;
        padding: 12px 20px;
        font-size: 14px;
    }

    .back-to-issues {
        width: 100%;
        justify-content: center;
        padding: 12px 20px;
        margin-bottom: 15px;
    }
}

/* Tablet Responsive */
@media (min-width: 768px) and (max-width: 991px) {
    .article-list-header h1 {
        font-size: 24px;
    }

    .article-list-header .issue-meta .meta-item {
        font-size: 14px;
    }

    .article-item .article-header .article-title {
        font-size: 17px;
    }

    .article-item .article-meta {
        gap: 12px;
    }

    .publication-info {
        gap: 15px;
    }
}

/* Large Desktop */
@media (min-width: 1200px) {
    .article-list-header h1 {
        font-size: 32px;
    }

    .article-item .article-header .article-title {
        font-size: 20px;
    }
}

/* Animation for accordion */
.accordion-collapse {
    transition: all 0.3s ease-in-out;
}

/* Print Styles */
@media print {
    .article-list-header,
    .back-to-issues,
    .download-btn {
        display: none !important;
    }

    .article-item {
        box-shadow: none;
        border: 1px solid #ddd;
        page-break-inside: avoid;
    }

    .article-item .article-header {
        background: #f8f9fa !important;
        border-bottom: 2px solid #222;
    }
}

/* Accessibility Improvements */
.article-item .article-header:focus {
    outline: 3px solid #106eea;
    outline-offset: 2px;
}

.download-btn:focus,
.back-to-issues:focus {
    outline: 3px solid #dc3545;
    outline-offset: 2px;
}

/* Loading State */
.article-loading {
    text-align: center;
    padding: 40px;
}

.article-loading::after {
    content: "Loading articles...";
    color: #6c757d;
    font-size: 16px;
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}