/* Import enhanced design system variables */
@import url('./utility-classes.css');

/* ========================================
   ENHANCED DETAILS PAGE STYLES
   ======================================== */

/*body {
    background: var(--gradient-subtle);
    color: var(--text-color-primary);
    font-family: var(--font-family-primary);
    min-height: 100vh;
    background-attachment: fixed;
}*/

.ebook-container {
    max-width: var(--container-max-width);
    margin: var(--spacing-8) auto;
    padding: 0 var(--container-padding);
}

/* ========================================
   BOOK COVER SECTION - ENHANCED
   ======================================== */
.book-cover {
    position: relative;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    box-shadow: var(--shadow-xl);
    border-radius: var(--border-radius-2xl);
    overflow: hidden;
  
    padding: var(--spacing-1);
}

    .book-cover:hover {
        transform: scale(1.02) translateY(-4px);
        box-shadow: var(--shadow-2xl);
    }

    .book-cover img {
        width: 100%;
        height: auto;
        object-fit: cover;
        border-radius: var(--border-radius-xl);
        background: var(--surface-color);
    }

.book-original-title {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--secondary-900); /* solid default */
    margin-bottom: var(--spacing-4);
    cursor: pointer;
    display: inline-block;
    background: none;
    background-clip: initial;
    -webkit-background-clip: initial;
    -webkit-text-fill-color: initial;
}

    .book-original-title:hover {
        transform: translateY(-2px);
        filter: brightness(1.1);
        background: var(--secondary-700);
        background-size: 200% 200%;
        background-clip: text;
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        color: transparent;
    }
/* Responsive : Pour les écrans >= 1440px */
@media (min-width: 1440px) {
    .ebook-container {
        max-width: 1400px;
    }

}
.authors {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}
.author {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    font-size: var(--font-size-xl);
    color: var(--interactive-primary);
    margin-top:var(--spacing-1);
    margin-bottom: var(--spacing-6);
    font-weight: var(--font-weight-medium);
}

    .author i {
        margin-right: 8px; /* <- espacement personnalisé */
    }

.author-name {
    position: relative;
    cursor: pointer;
    transition: all var(--transition-base);
}

    .author-name:hover {
        color: var(--interactive-primary-hover);
    }

    .author-name::after {
        content: '';
        position: absolute;
        bottom: -2px;
        left: 0;
        width: 0;
        height: 2px;
        background: var(--gradient-primary);
        transition: width var(--transition-base);
    }

    .author-name:hover::after {
        width: 100%;
    }



/* ========================================
   INFO SECTIONS - ENHANCED
   ======================================== */
.info-section {
    background: var(--surface-overlay);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius-3xl);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-8);
    margin-bottom: var(--spacing-8);
    border: 1px solid rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
}

    .info-section::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 4px;
        background: var(--gradient-hero);
        border-radius: var(--border-radius-3xl) var(--border-radius-3xl) 0 0;
    }

    .info-section h3 {
        font-size: var(--font-size-2xl);
        font-weight: var(--font-weight-bold);
        margin-bottom: var(--spacing-6);
        padding-bottom: var(--spacing-4);
        border-bottom: 2px solid var(--primary-200);
        color: var(--heading-color);
        position: relative;
        display: flex;
        align-items: center;
        gap: var(--spacing-3);
    }

        .info-section h3::before {
            content: '';
            width: 8px;
            height: 8px;
            background: var(--gradient-primary);
            border-radius: 50%;
            animation: pulse 2s infinite;
        }

.info-item {
    display: flex;
    margin-bottom: var(--spacing-4);
    padding: var(--spacing-3);
    border-radius: var(--border-radius-lg);
    transition: background-color var(--transition-fast);
}

    .info-item:hover {
        background-color: rgba(236, 180, 58, 0.05);
    }

.info-label {
    font-weight: var(--font-weight-semibold);
    width: 40%;
    color: var(--subheading-color);
    position: relative;
}

    .info-label::after {
        content: ':';
        margin-left: var(--spacing-1);
        color: var(--primary-500);
    }

.info-value {
    width: 60%;
    color: var(--body-color);
    font-weight: var(--font-weight-medium);
}

/* ========================================
   ACTION BUTTONS - ENHANCED
   ======================================== */
.action-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-8);
}

.btn-action {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    border-radius: var(--border-radius-full);
    font-weight: var(--font-weight-semibold);
    transition: all var(--transition-base);
    text-decoration: none;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

    .btn-action::before {
        content: '';
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
        transition: left 0.5s;
    }

    .btn-action:hover::before {
        left: 100%;
    }

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-on-primary);
    border: none;
    box-shadow: var(--shadow-md);
}

    .btn-primary:hover {
        transform: translateY(-3px);
        box-shadow: var(--shadow-xl);
        filter: brightness(1.1);
    }

    .btn-primary:active {
        transform: translateY(-1px);
    }

.btn-secondary {
    background: var(--surface-color);
    color: var(--interactive-primary);
    border: 2px solid var(--primary-200);
    box-shadow: var(--shadow-sm);
}

    .btn-secondary:hover {
        background: var(--gradient-warm);
        border-color: var(--primary-500);
        transform: translateY(-2px);
        color: var(--text-on-primary);
        box-shadow: var(--shadow-md);
    }

.btn-tertiary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--interactive-primary);
    border: 1px solid rgba(236, 180, 58, 0.3);
    backdrop-filter: blur(10px);
}

    .btn-tertiary:hover {
        background: rgba(236, 180, 58, 0.1);
        border-color: var(--primary-500);
        transform: translateY(-2px);
    }

.library-badge {
    display: inline-flex;
    align-items: center;
    background: var(--gradient-primary);
    color: var(--text-on-primary);
    padding: var(--spacing-3) var(--spacing-5);
    border-radius: var(--border-radius-full);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-6);
    box-shadow: var(--shadow-md);
    animation: pulse 3s infinite;
}

/* ========================================
   KEYWORDS & THEMES - ENHANCED
   ======================================== */
.themes {
    display: flex;
    flex-wrap: wrap;
   /* gap: var(--spacing-3);*/
}
.keyword {
    background: var(--surface-color);
    color: var(--secondary-700);
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-base);
    cursor: pointer;
    /*margin-right: 5px;*/ /* Ajoute un petit espace entre les # */
}

    .keyword:hover {
        background: var(--primary-50);
        color: var(--primary-700);
        border-color: var(--primary-300);
        transform: translateY(-2px);
        box-shadow: var(--shadow-sm);
    }
.theme {
    background: var(--gradient-warm);
    color: var(--white);
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--border-radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    cursor: pointer;
}

    .theme:hover {
        transform: translateY(-2px) scale(1.05);
        box-shadow: var(--shadow-md);
        filter: brightness(1.1);
    }

/* ========================================
   SPECIAL BUTTONS - ENHANCED
   ======================================== */
.copy-btn {
    width: 90px;
    font-size: var(--font-size-xs);
    padding: var(--spacing-2) var(--spacing-3);
    background: var(--gradient-secondary);
    color: var(--text-on-secondary);
    border: none;
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

    .copy-btn:hover {
        transform: scale(1.05);
        box-shadow: var(--shadow-md);
    }

    .copy-btn::after {
        content: '✓';
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%) scale(0);
        color: var(--success-500);
        font-weight: bold;
        transition: transform var(--transition-base);
    }

    .copy-btn.copied::after {
        transform: translate(-50%, -50%) scale(1.2);
    }

.download-btn {
    width: 160px;
    font-size: var(--font-size-sm);
    margin: var(--spacing-2);
    background: var(--gradient-primary);
    color: var(--text-on-primary);
    border: none;
    border-radius: var(--border-radius-full);
    padding: var(--spacing-3) var(--spacing-4);
    transition: all var(--transition-base);
    font-weight: var(--font-weight-semibold);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

    .download-btn:hover {
        transform: translateY(-3px);
        box-shadow: var(--shadow-xl);
        filter: brightness(1.1);
    }

    .download-btn::before {
        content: '';
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
        transition: left 0.6s;
    }

    .download-btn:hover::before {
        left: 100%;
    }

/* ========================================
   TABS - ENHANCED
   ======================================== */
.tab-container {
    background: var(--surface-overlay);
    backdrop-filter: blur(15px);
    border-radius: var(--border-radius-3xl);
    box-shadow: var(--shadow-xl);
    margin-bottom: var(--spacing-10);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.custom-tabs {
    border-bottom: none;
    /*background: linear-gradient(135deg, var(--primary-50), var(--secondary-50));*/
    padding: var(--spacing-2) var(--spacing-6);
    position: relative;
}

    .custom-tabs::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        height: 1px;
        background: var(--gradient-hero);
    }

    .custom-tabs .nav-item {
        margin-bottom: 0;
    }

    .custom-tabs .nav-link {
        border: none;
        color: var(--text-color-secondary);
        padding: var(--spacing-4) var(--spacing-6);
        font-weight: var(--font-weight-semibold);
        border-radius: var(--border-radius-xl) var(--border-radius-xl) 0 0;
        transition: all var(--transition-base);
        position: relative;
       /* margin: 0 var(--spacing-1);*/
        backdrop-filter: blur(10px);
    }

        .custom-tabs .nav-link::before {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 3px;
            background: var(--gradient-primary);
            border-radius: var(--border-radius-full);
            transition: all var(--transition-base);
            transform: translateX(-50%);
        }

        .custom-tabs .nav-link:hover {
            color: var(--interactive-primary-hover);
            background: rgba(255, 255, 255, 0.3);
            transform: translateY(-2px);
        }

            .custom-tabs .nav-link:hover::before {
                width: 80%;
            }

        .custom-tabs .nav-link.active {
            color: var(--primary-700);
            background: var(--surface-color);
            border: none;
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

            .custom-tabs .nav-link.active::before {
                width: 100%;
                height: 4px;
            }

.tab-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--heading-color);
    margin-bottom: var(--spacing-8);
    padding-bottom: var(--spacing-4);
    border-bottom: 3px solid var(--primary-200);
    position: relative;
    background: var(--gradient-hero);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

    .tab-title::after {
        content: '';
        position: absolute;
        bottom: -3px;
        left: 0;
        width: 100px;
        height: 3px;
        background: var(--gradient-primary);
        border-radius: var(--border-radius-full);
    }

/* ========================================
   TABLES - ENHANCED
   ======================================== */
.custom-table {
    border-collapse: separate;
    border-spacing: 0;
    width: 100%;
    background: var(--surface-color);
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

    .custom-table thead th {
        background: var(--gradient-secondary);
        color: var(--text-on-secondary);
        font-weight: var(--font-weight-bold);
        padding: var(--spacing-4) var(--spacing-5);
        border-bottom: none;
        position: relative;
        text-transform: uppercase;
        letter-spacing: 0.5px;
        font-size: var(--font-size-sm);
    }

        .custom-table thead th::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 2px;
            background: var(--gradient-primary);
        }

    .custom-table tbody tr {
      /*  transition: all var(--transition-base);*/
        border-bottom: 1px solid var(--gray-100);
    }

        .custom-table tbody tr:hover {
            background: var(--gradient-subtle);
            transform: scale(1.01);
            box-shadow: var(--shadow-sm);
              text-decoration: underline;
        }

        .custom-table tbody tr:last-child {
            border-bottom: none;
        }

    .custom-table td {
        padding: var(--spacing-4) var(--spacing-5);
        vertical-align: middle;
        position: relative;
    }
    
.title-cell {
    font-weight: var(--font-weight-semibold);
    color: var(--secondary-900);
    cursor: pointer;
    transition: color var(--transition-fast);
}

    .title-cell:hover {
        color: var(--secondary-700);
    }
  .title-cell a,
.title-cell a:hover,
.title-cell a:focus,
.title-cell a:active {
    color: var(--secondary-900);      /* Couleur normale */
    text-decoration: none !important; /* Supprime le soulignement dans tous les cas */
}

.title-cell:hover a {
    color: var(--secondary-700);      /* Couleur au survol */
}


/* ========================================
   STATUS BADGES - ENHANCED
   ======================================== */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-1);
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--border-radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

    .status-badge::before {
        content: '';
        position: absolute;
        left: 0;
        top: 0;
        bottom: 0;
        width: 4px;
        border-radius: var(--border-radius-full);
    }

.status-active {
  /*  background: var(--status-success-bg);*/
    color: var(--status-success-text);
 /*   border: 1px solid var(--status-success-border);*/
}


.status-inactive {
    background: var(--status-danger-bg);
    color: var(--status-danger-text);
    border: 1px solid var(--status-danger-border);
}

    .status-inactive::before {
        background: var(--danger-500);
    }

/* ========================================
   ACTION BUTTONS - ENHANCED
   ======================================== */
.action-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

    .action-button::before {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        width: 0;
        height: 0;
        border-radius: 50%;
        background: rgba(255, 255, 255, 0.3);
        transition: all var(--transition-base);
        transform: translate(-50%, -50%);
    }

    .action-button:hover::before {
        width: 100%;
        height: 100%;
    }

.view-button {
    background: var(--primary-50);
    color: var(--primary-600);
    border: 2px solid var(--primary-200);
}

    .view-button:hover {
        background: var(--gradient-primary);
        color: var(--text-on-primary);
        transform: scale(1.1);
        box-shadow: var(--shadow-md);
    }

.empty-data {
    padding: var(--spacing-12);
    color: var(--text-color-muted);
    font-style: italic;
    text-align: center;
    background: var(--gradient-subtle);
    border-radius: var(--border-radius-xl);
    margin: var(--spacing-6) 0;
}

/* ========================================
   CONTENT CARDS - ENHANCED
   ======================================== */
.content-card {
    background: var(--surface-overlay);
    backdrop-filter: blur(15px);
    border-radius: var(--border-radius-2xl);
    padding: var(--spacing-8);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

    .content-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 4px;
        background: var(--gradient-hero);
    }

.abstract-text, .foreword-text {
    line-height: var(--line-height-relaxed);
    font-size: var(--font-size-base);
    color: var(--body-color);
    text-align: justify;
}

.volume-row, .translation-row {
    cursor: pointer;
    transition: all var(--transition-base);
}

    .volume-row:hover, .translation-row:hover {
        background: var(--gradient-subtle) !important;
        transform: translateX(4px);
    }

.language-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-1);
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--border-radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    background: var(--gradient-cool);
    color: var(--white);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

    .language-badge:hover {
        transform: scale(1.05);
        box-shadow: var(--shadow-md);
    }

/* ========================================
   MODAL STYLING - ENHANCED
   ======================================== */
.modal-header {
    background: var(--gradient-hero) !important;
    color: var(--text-on-primary) !important;
    border-bottom: none !important;
    padding: var(--spacing-6) !important;
    border-radius: var(--border-radius-xl) var(--border-radius-xl) 0 0 !important;
}

.modal-content {
    border: none !important;
    border-radius: var(--border-radius-xl) !important;
    box-shadow: var(--shadow-2xl) !important;
    backdrop-filter: blur(20px);
    background: var(--surface-overlay) !important;
}

.citation-item .card-header {
    background: var(--gradient-subtle);
    color: var(--heading-color);
    border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
    border-bottom: 2px solid var(--primary-200);
}

.btn-outline-primary {
    color: var(--interactive-primary);
    border-color: var(--primary-500);
    border-width: 2px;
    font-weight: var(--font-weight-semibold);
    transition: all var(--transition-base);
}

    .btn-outline-primary:hover {
        background: var(--gradient-primary);
        color: var(--text-on-primary);
        transform: translateY(-2px);
        box-shadow: var(--shadow-md);
    }

/* ========================================
   AI SPECIFIC STYLES - ENHANCED
   ======================================== */
.ai-modal .modal-dialog {
    max-width: 800px;
}

.gradient-bg {
    background: var(--gradient-hero);
    border: none;
    border-radius: var(--border-radius-3xl);
    box-shadow: var(--shadow-2xl);
    position: relative;
    overflow: hidden;
}

    .gradient-bg::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.1) 50%, transparent 70%);
        animation: shimmer 3s infinite;
    }

.animated-border {
    border-bottom: none;
    position: relative;
    overflow: hidden;
    padding: var(--spacing-8);
    background: var(--surface-overlay);
    backdrop-filter: blur(20px);
}

    .animated-border::after {
        content: '';
        position: absolute;
        left: 0;
        bottom: 0;
        height: 4px;
        width: 100%;
        background: var(--gradient-hero);
        background-size: 300% 100%;
        animation: gradient-move 4s linear infinite;
    }

.glow-text {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-extrabold);
    color: var(--heading-color);
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    text-shadow: 0 0 20px rgba(236, 180, 58, 0.3);
}

.title-text {
    background: var(--gradient-hero);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: color-shift 6s ease infinite;
    background-size: 200% 200%;
}

.ai-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    background: var(--gradient-primary);
    color: var(--text-on-primary);
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--border-radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    box-shadow: 0 4px 15px rgba(236, 180, 58, 0.4);
    text-transform: uppercase;
    letter-spacing: 1px;
    animation: glow 2s ease-in-out infinite alternate;
}

/* ========================================
   BOOK CARD STYLING - ENHANCED
   ======================================== */
.book-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-5);
    background: var(--surface-overlay);
    backdrop-filter: blur(15px);
    border-radius: var(--border-radius-2xl);
    padding: var(--spacing-6);
    margin-bottom: var(--spacing-6);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border: 1px solid rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
}

    .book-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 4px;
        height: 100%;
        background: var(--gradient-primary);
    }

    .book-card:hover {
        transform: translateY(-4px) scale(1.02);
        box-shadow: var(--shadow-xl);
        border-color: var(--primary-300);
    }

.book-icon {
    background: var(--gradient-primary);
    width: 70px;
    height: 70px;
    border-radius: var(--border-radius-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-on-primary);
    box-shadow: var(--shadow-lg);
    font-size: var(--font-size-xl);
    position: relative;
    overflow: hidden;
}

    .book-icon::before {
        content: '';
        position: absolute;
        top: -50%;
        left: -50%;
        width: 200%;
        height: 200%;
        background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.3), transparent);
        animation: rotate 3s linear infinite;
    }

.book-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-2);
    color: var(--heading-color);
    transition: color var(--transition-fast);
}

.book-card:hover .book-title {
    color: var(--interactive-primary-hover);
}

.book-meta {
    font-size: var(--font-size-sm);
    color: var(--text-color-secondary);
    font-style: italic;
    font-weight: var(--font-weight-medium);
}

/* ========================================
   LANGUAGE SELECTOR - ENHANCED
   ======================================== */
.language-selector {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-6);
    padding: var(--spacing-4);
    background: var(--surface-overlay);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius-2xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.language-btn {
    background: var(--surface-color);
   border: 2px solid var(--gray-200);/*
    border-radius: var(--border-radius-full);*/
    padding: var(--spacing-3) var(--spacing-5);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    transition: all var(--transition-base);
    color: var(--text-color-primary);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

    .language-btn::before {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        width: 0;
        height: 0;
        border-radius: 50%;
        background: var(--gradient-primary);
        transition: all var(--transition-base);
        transform: translate(-50%, -50%);
        z-index: -1;
    }

    .language-btn:hover {
        border-color: var(--primary-400);
        background: var(--gradient-primary);
        box-shadow: var(--shadow-sm);
    }

        .language-btn:hover::before {
            width: 100%;
            height: 100%;
        }

    .language-btn.active {
        background: var(--gradient-primary);
        color: var(--text-on-primary);
        border-color: var(--primary-500);
        box-shadow: var(--shadow-md);
    }

        .language-btn.active::before {
            width: 100%;
            height: 100%;
        }

/* ========================================
   MARKDOWN CONTENT - ENHANCED
   ======================================== */
.markdown-content {
    line-height: var(--line-height-relaxed);
    font-family: var(--font-family-primary);
    color: var(--body-color);
    animation: fadeIn 0.5s ease-in-out;
    background: var(--surface-color);
    padding: var(--spacing-6);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-sm);
}

    .markdown-content h1,
    .markdown-content h2,
    .markdown-content h3 {
        margin-top: 1.2em;
        margin-bottom: 0.6em;
        color: var(--heading-color);
        font-weight: var(--font-weight-bold);
        position: relative;
    }

        .markdown-content h1::after,
        .markdown-content h2::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 50px;
            height: 3px;
            background: var(--gradient-primary);
            border-radius: var(--border-radius-full);
        }

    .markdown-content blockquote {
        border-left: 4px solid var(--primary-500);
        padding-left: var(--spacing-4);
        margin-left: 0;
        color: var(--text-color-secondary);
        font-style: italic;
        background: var(--gradient-subtle);
        border-radius: 0 var(--border-radius-lg) var(--border-radius-lg) 0;
        padding: var(--spacing-4);
        position: relative;
        box-shadow: var(--shadow-sm);
    }

        .markdown-content blockquote::before {
            content: '"';
            position: absolute;
            top: var(--spacing-2);
            left: var(--spacing-2);
            font-size: var(--font-size-3xl);
            color: var(--primary-400);
            font-weight: var(--font-weight-bold);
            line-height: 1;
        }

    .markdown-content a {
        color: var(--link-color);
        text-decoration: none;
        transition: all var(--transition-fast);
        position: relative;
        font-weight: var(--font-weight-medium);
    }

        .markdown-content a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--gradient-primary);
            transition: width var(--transition-base);
        }

        .markdown-content a:hover {
            color: var(--link-hover-color);
        }

            .markdown-content a:hover::after {
                width: 100%;
            }

/* ========================================
   ARTICLES LIST - ENHANCED
   ======================================== */
.articles-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-5);
    margin-top: var(--spacing-6);
}

.article-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-6);
    background: var(--surface-overlay);
    backdrop-filter: blur(15px);
    padding: var(--spacing-6);
    border-radius: var(--border-radius-2xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    flex-wrap: wrap;
    border: 1px solid rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
}

    .article-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 4px;
        background: var(--gradient-hero);
    }

    .article-card:hover {
        transform: translateY(-6px);
        box-shadow: var(--shadow-xl);
        border-color: var(--primary-300);
    }

    .article-card.selected {
        border: 2px solid var(--primary-500);
        box-shadow: var(--focus-ring-shadow), var(--shadow-lg);
        background: var(--primary-50);
    }

.article-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-3);
    color: var(--heading-color);
    transition: color var(--transition-fast);
}

.article-card:hover .article-title {
    color: var(--interactive-primary-hover);
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-4);
    font-size: var(--font-size-sm);
    color: var(--text-color-secondary);
    margin-bottom: var(--spacing-3);
    font-weight: var(--font-weight-medium);
}

/* ========================================
   RESPONSIVE ADJUSTMENTS - ENHANCED
   ======================================== */
@media (max-width: 767.98px) {
    .book-cover {
        max-width: 280px;
        margin: 0 auto var(--spacing-8);
    }

    .info-item {
        flex-direction: column;
        gap: var(--spacing-2);
    }

    .info-label, .info-value {
        width: 100%;
    }

    .custom-tabs {
        display: flex;
        flex-wrap: nowrap;
        overflow-x: auto;
        white-space: nowrap;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        -ms-overflow-style: none;
    }

        .custom-tabs::-webkit-scrollbar {
            display: none;
        }

        .custom-tabs .nav-link {
            padding: var(--spacing-3) var(--spacing-4);
            font-size: var(--font-size-sm);
        }

    .tab-title {
        font-size: var(--font-size-xl);
    }

    .book-card {
        flex-direction: column;
        text-align: center;
    }

    .action-buttons {
        justify-content: center;
    }

    .glow-text {
        font-size: var(--font-size-2xl);
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .ebook-container {
        padding: 0 var(--spacing-3);
    }

    .info-section, .content-card {
        padding: var(--spacing-4);
    }

    .book-original-title {
        font-size: var(--font-size-2xl);
    }

    .author {
        font-size: var(--font-size-lg);
    }
}

/* ========================================
   ANIMATIONS - ENHANCED
   ======================================== */