:root {
    --primary-color: #5d6b82;
    --secondary-color: #3a4a6b;
    --accent-color: #8e9db8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --success-color: #28a745;
    --transition: all 0.3s ease;

    /* Genre colors */
    --genre-roman: #5d826b;
    --genre-poesie: #825d6b;
    --genre-nouvelle: #6b5d82;
    --genre-essai: #826b5d;
    --genre-biographie: #5d6b82;
    --genre-theatre: #6b825d;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

header {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(5px);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
}

.logo i {
    margin-right: 0.5rem;
    color: var(--accent-color);
}

.back-btn {
    display: flex;
    align-items: center;
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.back-btn:hover {
    color: var(--accent-color);
}

.back-btn i {
    margin-right: 0.5rem;
}

.main-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.page-title {
    text-align: center;
    margin-bottom: 2rem;
    position: relative;
}

.page-title h1 {
    font-size: 2.5rem;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.page-title p {
    font-size: 1.1rem;
    color: #666;
    max-width: 700px;
    margin: 0 auto;
}

.page-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: var(--accent-color);
    margin: 1.5rem auto;
    border-radius: 2px;
}

.filters-container {
    background: white;
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    margin-bottom: 2rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: flex-end;
}

.filter-group {
    flex: 1;
    min-width: 200px;
}

.filter-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark-color);
}

.filter-group select,
.filter-group input {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 1rem;
    transition: var(--transition);
}

.filter-group select:focus,
.filter-group input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(142, 157, 184, 0.2);
}

.search-btn {
    padding: 0.8rem 1.5rem;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
}

.search-btn:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
}

.publications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    width: 100%;
}

.publication-card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    cursor: pointer;
}

.publication-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.12);
}

.publication-image {
    height: 200px;
    overflow: hidden;
    position: relative;
    background: linear-gradient(135deg, #e4e8f0 0%, #c3cfe2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--secondary-color);
    font-size: 3rem;
}

.publication-image i {
    opacity: 0.3;
}

.publication-content {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.publication-genre {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    background: var(--genre-roman);
    color: white;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 0.8rem;
    align-self: flex-start;
}

.publication-title {
    font-size: 1.3rem;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
    font-weight: 600;
    line-height: 1.3;
}

.publication-abstract {
    color: #666;
    font-size: 0.95rem;
    margin-bottom: 1rem;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.publication-authors {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.author-tag {
    background: #f0f2f5;
    padding: 0.3rem 0.6rem;
    border-radius: 50px;
    font-size: 0.8rem;
    color: #555;
}

.publication-meta {
    display: flex;
    justify-content: space-between;
    color: #777;
    font-size: 0.85rem;
    margin-top: auto;
}

.publication-year {
    display: flex;
    align-items: center;
}

.publication-year i {
    margin-right: 0.3rem;
}

.pagination {
    display: flex;
    justify-content: center;
    margin-top: 3rem;
    gap: 0.5rem;
}

.pagination a,
.pagination span {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    text-decoration: none;
    transition: var(--transition);
}

.pagination a {
    color: var(--secondary-color);
    border: 1px solid #ddd;
}

.pagination a:hover {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.pagination .active {
    background: var(--secondary-color);
    color: white;
    border: 1px solid var(--secondary-color);
}

.pagination .disabled {
    color: #aaa;
    pointer-events: none;
}

footer {
    background: var(--dark-color);
    color: white;
    text-align: center;
    padding: 2rem;
    margin-top: 3rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-content p {
    margin-bottom: 1rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.social-links a {
    color: white;
    font-size: 1.5rem;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--accent-color);
}

/* Loading state */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-left-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Responsive adjustments */
@media (max-width: 992px) {
    .filters-container {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-group {
        min-width: 100%;
    }

    .search-btn {
        width: 100%;
    }
}

@media (max-width: 768px) {
    .page-title h1 {
        font-size: 2rem;
    }

    .page-title p {
        font-size: 1rem;
    }

    .header-content {
        padding: 0 1rem;
    }

    .main-container {
        padding: 1.5rem;
    }
}

@media (max-width: 576px) {
    .publications-grid {
        grid-template-columns: 1fr;
    }

    .page-title h1 {
        font-size: 1.8rem;
    }

    .publication-title {
        font-size: 1.2rem;
    }
}

/* Popup Modal Styles */
.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
}

.popup-overlay.active {
    opacity: 1;
    visibility: visible;
}

.popup-content {
    background: white;
    border-radius: 12px;
    width: 90%;
    max-width: 700px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transform: translateY(20px);
    transition: all 0.3s ease;
    position: relative;
    padding: 2rem;
}

.popup-overlay.active .popup-content {
    transform: translateY(0);
}

.popup-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: #777;
    transition: all 0.2s ease;
}

.popup-close:hover {
    color: var(--secondary-color);
    transform: rotate(90deg);
}

.popup-header {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #eee;
}

.popup-genre {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    background: var(--genre-roman);
    color: white;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 0.8rem;
}

.popup-title {
    font-size: 1.8rem;
    color: var(--dark-color);
    margin-bottom: 1rem;
    font-weight: 600;
}

.popup-abstract {
    color: #555;
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: 2rem;
}

.popup-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.detail-group {
    margin-bottom: 0.5rem;
}

.detail-label {
    font-size: 0.8rem;
    color: #777;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.3rem;
    display: block;
}

.detail-value {
    font-size: 1rem;
    color: var(--dark-color);
    font-weight: 500;
    word-break: break-word;
}

.detail-value a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: all 0.2s ease;
}

.detail-value a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

.popup-footer {
    display: flex;
    justify-content: flex-end;
    padding-top: 1rem;
    border-top: 1px solid #eee;
}

.popup-btn {
    padding: 0.7rem 1.5rem;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.popup-btn:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
}

/* Animation for details */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.detail-group {
    animation: fadeInUp 0.4s ease forwards;
    opacity: 0;
}

.detail-group:nth-child(1) { animation-delay: 0.1s; }
.detail-group:nth-child(2) { animation-delay: 0.2s; }
.detail-group:nth-child(3) { animation-delay: 0.3s; }
.detail-group:nth-child(4) { animation-delay: 0.4s; }
.detail-group:nth-child(5) { animation-delay: 0.5s; }
.detail-group:nth-child(6) { animation-delay: 0.6s; }

/* Responsive adjustments */
@media (max-width: 768px) {
    .popup-content {
        width: 95%;
        padding: 1.5rem;
    }

    .popup-title {
        font-size: 1.5rem;
    }

    .popup-details {
        grid-template-columns: 1fr;
    }
}

.reference-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--secondary-color);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    z-index: 2;
    opacity: 0;
}

.publication-card:hover .reference-btn {
    opacity: 1;
    transform: translateY(0);
}

.reference-btn:hover {
    background: var(--accent-color);
    color: white;
    transform: scale(1.1) !important;
}

.reference-btn.copied {
    background: var(--success-color);
    color: white;
}

/* Updated tooltip positioning */
.reference-btn.copied::after {
    content: 'Référence copiée!';
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background: var(--dark-color);
    color: white;
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    font-size: 0.7rem;
    white-space: nowrap;
    animation: fadeOut 2s ease forwards;
    pointer-events: none;
}

/* Tooltip arrow */
.reference-btn.copied::before {
    content: '';
    position: absolute;
    bottom: -5px;
    right: 12px;
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-bottom: 5px solid var(--dark-color);
    transform: rotate(180deg);
    animation: fadeOut 2s ease forwards;
}

@keyframes fadeOut {
    0% { opacity: 0; transform: translateY(-5px); }
    20% { opacity: 1; transform: translateY(0); }
    80% { opacity: 1; transform: translateY(0); }
    100% { opacity: 0; transform: translateY(5px); }
}

/* Genre-specific colors */
.genre-roman { background-color: var(--genre-roman) !important; }
.genre-poesie { background-color: var(--genre-poesie) !important; }
.genre-nouvelle { background-color: var(--genre-nouvelle) !important; }
.genre-essai { background-color: var(--genre-essai) !important; }
.genre-biographie { background-color: var(--genre-biographie) !important; }
.genre-theatre { background-color: var(--genre-theatre) !important; }