/* ============================================
   FRONTEND - STYLES ACADÉMIQUES
   Version scientifique & épurée
   Mobile-first
   ============================================ */

/* --- VARIABLES --- */
:root {
    --dl-primary: #1A2B4C;        /* Bleu nuit profond */
    --dl-primary-light: #2C3E6B;   /* Bleu marine */
    --dl-accent: #B8860B;          /* Or / Cuivre */
    --dl-accent-hover: #D4A020;    /* Or plus clair */
    --dl-bg: #F8F9FA;             /* Gris très clair */
    --dl-text: #2D3748;           /* Gris anthracite */
    --dl-text-light: #718096;      /* Gris moyen */
    --dl-border: #E2E8F0;          /* Gris clair */
    --dl-white: #FFFFFF;
    --dl-shadow: 0 4px 20px rgba(26, 43, 76, 0.08);
    --dl-shadow-hover: 0 8px 30px rgba(26, 43, 76, 0.15);
    --dl-radius: 12px;
    --dl-radius-sm: 8px;
    --dl-transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- RESET & BASE --- */
.dl-homepage {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--dl-text);
    box-sizing: border-box;
    font-size: 16px;
    line-height: 1.7;
}

.dl-homepage * {
    box-sizing: border-box;
}

/* --- HERO SECTION --- */
.dl-hero-section {
    background: linear-gradient(135deg, var(--dl-primary) 0%, var(--dl-primary-light) 100%);
    color: var(--dl-white);
    padding: 4rem 2rem;
    border-radius: var(--dl-radius);
    text-align: center;
    margin-bottom: 3rem;
    box-shadow: var(--dl-shadow);
    position: relative;
    overflow: hidden;
}

.dl-hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 500px;
    height: 500px;
    background: rgba(184, 134, 11, 0.05);
    border-radius: 50%;
    pointer-events: none;
}

.dl-hero-section::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: rgba(184, 134, 11, 0.03);
    border-radius: 50%;
    pointer-events: none;
}

.dl-hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
}

.dl-hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    margin-bottom: 1.5rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--dl-white);
}

.dl-hero-title .highlight {
    color: var(--dl-accent);
}

.dl-hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    opacity: 0.9;
    margin: 0 auto 2.5rem;
    line-height: 1.8;
    font-weight: 300;
    max-width: 650px;
}

/* --- STATS --- */
.dl-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1.5rem;
    margin-top: 3rem;
}

.dl-stat-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 1.5rem;
    border-radius: var(--dl-radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.15);
    transition: var(--dl-transition);
}

.dl-stat-card:hover {
    transform: translateY(-4px);
    background: rgba(255, 255, 255, 0.18);
}

.dl-stat-number {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 0.3rem;
    color: var(--dl-white);
    letter-spacing: -0.02em;
}

.dl-stat-number .accent {
    color: var(--dl-accent);
}

.dl-stat-label {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.8;
    color: var(--dl-white);
}

/* --- BOUTONS CTA --- */
.dl-cta-buttons {
    display: flex;
    gap: 1.2rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 2.5rem;
}

.dl-cta-button {
    padding: 1rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.05rem;
    transition: var(--dl-transition);
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    border: 2px solid transparent;
}

.dl-cta-primary {
    background: var(--dl-accent);
    color: var(--dl-white);
    border-color: var(--dl-accent);
}

.dl-cta-primary:hover {
    background: var(--dl-accent-hover);
    border-color: var(--dl-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(184, 134, 11, 0.3);
    text-decoration: none;
    color: var(--dl-white);
}

.dl-cta-secondary {
    background: transparent;
    color: var(--dl-white);
    border-color: rgba(255, 255, 255, 0.4);
}

.dl-cta-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--dl-white);
    transform: translateY(-2px);
    text-decoration: none;
    color: var(--dl-white);
}

/* --- SECTIONS --- */
.dl-section {
    margin: 4rem 0;
}

.dl-section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.dl-section-title {
    font-size: 2.2rem;
    color: var(--dl-primary);
    margin-bottom: 0.8rem;
    font-weight: 700;
    position: relative;
    display: inline-block;
}

.dl-section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--dl-accent);
    margin: 12px auto 0;
    border-radius: 2px;
}

.dl-section-desc {
    color: var(--dl-text-light);
    font-size: 1.1rem;
    line-height: 1.7;
    max-width: 700px;
    margin: 0 auto;
    font-weight: 300;
}

/* --- FILTRES RAPIDES (Types de documents) --- */
.dl-quick-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    margin-top: 1.5rem;
}

.dl-quick-filter {
    padding: 8px 20px;
    background: var(--dl-white);
    color: var(--dl-primary);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    border: 2px solid var(--dl-border);
    transition: var(--dl-transition);
}

.dl-quick-filter:hover {
    border-color: var(--dl-accent);
    color: var(--dl-accent);
    transform: translateY(-2px);
    box-shadow: var(--dl-shadow);
}

.dl-quick-filter .count {
    display: inline-block;
    background: var(--dl-bg);
    padding: 0 8px;
    border-radius: 10px;
    font-size: 0.75rem;
    margin-left: 4px;
    color: var(--dl-text-light);
}

/* --- GRILLE DES LIVRES --- */
.dl-books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.dl-book-card-home {
    background: var(--dl-white);
    border-radius: var(--dl-radius-sm);
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(26, 43, 76, 0.06);
    transition: var(--dl-transition);
    text-decoration: none;
    display: flex;
    flex-direction: column;
    height: 100%;
    border: 1px solid var(--dl-border);
}

.dl-book-card-home:hover {
    transform: translateY(-6px);
    box-shadow: var(--dl-shadow-hover);
    border-color: var(--dl-accent);
    text-decoration: none;
}

.dl-book-cover-wrapper {
    width: 100%;
    aspect-ratio: 2/3;
    background: var(--dl-bg);
    position: relative;
    overflow: hidden;
}

.dl-book-cover-home {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.dl-book-card-home:hover .dl-book-cover-home {
    transform: scale(1.05);
}

.dl-book-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    background: linear-gradient(135deg, #f0f2f5 0%, #e2e8f0 100%);
    color: var(--dl-text-light);
}

.dl-book-info-home {
    padding: 1.2rem 1.2rem 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.dl-book-title-home {
    font-weight: 700;
    margin: 0 0 0.4rem 0;
    font-size: 1rem;
    line-height: 1.4;
    color: var(--dl-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.dl-book-author-home {
    color: var(--dl-text-light);
    font-size: 0.85rem;
    margin: 0;
}

.dl-book-type-home {
    font-size: 0.75rem;
    color: var(--dl-text-light);
    margin: 4px 0 0;
    padding: 2px 8px;
    background: var(--dl-bg);
    border-radius: 3px;
    display: inline-block;
    align-self: flex-start;
}

.dl-book-doc-type-home {
    font-size: 0.7rem;
    color: var(--dl-accent);
    margin: 4px 0 0;
    padding: 2px 8px;
    background: rgba(184, 134, 11, 0.08);
    border-radius: 3px;
    display: inline-block;
    align-self: flex-start;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

/* --- CATÉGORIES --- */
.dl-categories-list {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}

.dl-category-tag {
    background: var(--dl-white);
    color: var(--dl-primary);
    padding: 10px 22px;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    box-shadow: 0 2px 4px rgba(26, 43, 76, 0.04);
    border: 2px solid var(--dl-border);
    transition: var(--dl-transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.dl-category-tag span {
    background: var(--dl-bg);
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    color: var(--dl-text-light);
}

.dl-category-tag:hover {
    border-color: var(--dl-accent);
    color: var(--dl-accent);
    transform: translateY(-2px);
    box-shadow: var(--dl-shadow);
    text-decoration: none;
}

.dl-category-tag:hover span {
    background: rgba(184, 134, 11, 0.08);
    color: var(--dl-accent);
}

/* --- BOUTON CENTRÉ --- */
.dl-btn-centered {
    display: inline-block;
    margin-top: 2rem;
    padding: 12px 32px;
    background: transparent;
    color: var(--dl-primary);
    border: 2px solid var(--dl-accent);
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--dl-transition);
}

.dl-btn-centered:hover {
    background: var(--dl-accent);
    color: var(--dl-white);
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(184, 134, 11, 0.25);
}

/* --- SEARCH FORM --- */
.dl-search-form {
    max-width: 1000px;
    margin: 0 auto 40px;
    background: var(--dl-white);
    padding: 30px;
    border-radius: var(--dl-radius);
    box-shadow: var(--dl-shadow);
    border: 1px solid var(--dl-border);
}

.dl-search-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.dl-search-field {
    margin-bottom: 5px;
}

.dl-search-field label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--dl-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.dl-search-field input,
.dl-search-field select {
    width: 100%;
    padding: 10px 14px;
    border: 2px solid var(--dl-border);
    border-radius: var(--dl-radius-sm);
    font-size: 14px;
    color: var(--dl-text);
    background: var(--dl-white);
    transition: var(--dl-transition);
}

.dl-search-field input:focus,
.dl-search-field select:focus {
    border-color: var(--dl-accent);
    box-shadow: 0 0 0 3px rgba(184, 134, 11, 0.1);
    outline: none;
}

.dl-search-field input::placeholder {
    color: var(--dl-text-light);
    font-size: 0.9rem;
}

.dl-year-range {
    display: flex;
    align-items: center;
    gap: 8px;
}

.dl-year-range input {
    width: 100%;
}

.dl-year-range span {
    color: var(--dl-text-light);
}

.dl-search-button {
    background: var(--dl-primary);
    color: var(--dl-white);
    border: none;
    padding: 14px 35px;
    border-radius: var(--dl-radius-sm);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--dl-transition);
    width: 100%;
    max-width: 300px;
    display: block;
    margin: 0 auto;
}

.dl-search-button:hover {
    background: var(--dl-accent);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(184, 134, 11, 0.3);
}

/* --- ACCESS DENIED (neutre) --- */
.dl-access-denied {
    background: #f8f4f0;
    border: 2px solid var(--dl-accent);
    border-radius: var(--dl-radius);
    padding: 30px 35px;
    margin: 20px 0;
    text-align: center;
    box-shadow: var(--dl-shadow);
}

.dl-access-message h3 {
    color: var(--dl-primary);
    font-size: 1.4rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.dl-access-message p {
    color: var(--dl-text);
    font-size: 1rem;
    margin-bottom: 15px;
}

.dl-access-actions .button {
    padding: 12px 28px;
    border-radius: var(--dl-radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    transition: var(--dl-transition);
    color: var(--dl-white);
    background-color: var(--dl-primary);
    border: none;
}

.dl-access-actions .button:hover {
    background-color: var(--dl-accent);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(184, 134, 11, 0.3);
}

/* --- MÉTADONNÉES DANS LES ARCHIVES --- */
.dl-book-archive-info {
    margin: 8px 0 12px 0;
    padding: 8px 14px;
    background: var(--dl-bg);
    border-left: 4px solid var(--dl-accent);
    border-radius: var(--dl-radius-sm);
    font-size: 0.9rem;
    line-height: 1.8;
    display: flex;
    flex-wrap: wrap;
    gap: 4px 20px;
}

.dl-book-archive-info span {
    display: inline-block;
}

.dl-book-archive-info strong {
    color: var(--dl-primary);
    font-weight: 600;
}

.dl-book-archive-info .dl-book-doc-type {
    color: var(--dl-accent);
    font-weight: 500;
}

/* --- RESPONSIVE --- */
@media (max-width: 768px) {
    .dl-homepage {
        padding: 15px;
        font-size: 15px;
    }

    .dl-hero-section {
        padding: 2.5rem 1.5rem;
    }

    .dl-hero-title {
        font-size: 2rem;
    }

    .dl-hero-subtitle {
        font-size: 1rem;
    }

    .dl-section-title {
        font-size: 1.7rem;
    }

    .dl-stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .dl-stat-card {
        padding: 1rem;
    }

    .dl-stat-number {
        font-size: 1.8rem;
    }

    .dl-books-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 1.2rem;
    }

    .dl-book-info-home {
        padding: 1rem;
    }

    .dl-book-title-home {
        font-size: 0.9rem;
    }

    .dl-quick-filter {
        font-size: 0.8rem;
        padding: 6px 14px;
    }

    .dl-search-form {
        padding: 20px;
    }

    .dl-search-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }

    .dl-search-field label {
        font-size: 0.75rem;
    }

    .dl-search-field input,
    .dl-search-field select {
        padding: 8px 12px;
        font-size: 13px;
    }

    .dl-cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .dl-cta-button {
        width: 100%;
        justify-content: center;
    }

    .dl-category-tag {
        font-size: 0.85rem;
        padding: 8px 16px;
    }

    .dl-book-archive-info {
        font-size: 0.8rem;
        padding: 6px 10px;
        gap: 2px 12px;
    }
}

@media (max-width: 480px) {
    .dl-hero-title {
        font-size: 1.6rem;
    }

    .dl-hero-section {
        padding: 2rem 1rem;
    }

    .dl-stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 0.8rem;
    }

    .dl-stat-number {
        font-size: 1.5rem;
    }

    .dl-stat-label {
        font-size: 0.7rem;
    }

    .dl-section-title {
        font-size: 1.4rem;
    }

    .dl-section-desc {
        font-size: 0.95rem;
    }

    .dl-books-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.8rem;
    }

    .dl-book-info-home {
        padding: 0.8rem;
    }

    .dl-book-title-home {
        font-size: 0.8rem;
    }

    .dl-book-author-home {
        font-size: 0.7rem;
    }

    .dl-search-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .dl-search-button {
        max-width: 100%;
    }

    .dl-category-tag {
        font-size: 0.75rem;
        padding: 6px 12px;
    }

    .dl-book-archive-info {
        font-size: 0.7rem;
        padding: 4px 8px;
        flex-direction: column;
        gap: 2px;
    }
}

/* --- SCROLLBAR PERSONNALISÉE --- */
.dl-categories-list::-webkit-scrollbar,
.dl-toc-list::-webkit-scrollbar {
    width: 6px;
}

.dl-categories-list::-webkit-scrollbar-track,
.dl-toc-list::-webkit-scrollbar-track {
    background: var(--dl-bg);
    border-radius: 3px;
}

.dl-categories-list::-webkit-scrollbar-thumb,
.dl-toc-list::-webkit-scrollbar-thumb {
    background: var(--dl-accent);
    border-radius: 3px;
}

.dl-categories-list::-webkit-scrollbar-thumb:hover,
.dl-toc-list::-webkit-scrollbar-thumb:hover {
    background: var(--dl-accent-hover);
}