/* Основные стили */
:root {
    --primary-color: #2563eb;
    --background-color: #ffffff;
    --surface-color: #f8fafc;
    --text-color: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --font-size-base: 16px;
    --font-size-scale: 1;
}

/* Темная тема */
[data-theme="dark"] {
    --primary-color: #3b82f6;
    --background-color: #0f172a;
    --surface-color: #1e293b;
    --text-color: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    font-size: calc(var(--font-size-base) * var(--font-size-scale));
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Навигация */
.navbar {
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

.nav-brand:hover {
    color: var(--primary-color);
    opacity: 0.8;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-btn, .font-btn {
    background: none;
    border: 2px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.2s ease;
}

.theme-btn:hover, .font-btn:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.font-controls {
    display: flex;
    gap: 0.5rem;
}

/* Основной контент */
.main-content {
    min-height: calc(100vh - 80px);
    padding: 2rem 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--text-color);
    line-height: 1.2;
}

/* Хлебные крошки */
.breadcrumb {
    margin-bottom: 2rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.breadcrumb a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

.breadcrumb a:hover {
    color: var(--primary-color);
    opacity: 0.8;
}

.breadcrumb span {
    color: var(--text-secondary);
}

/* Сетка авторов */
.authors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.author-card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.author-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.author-card h2 {
    margin-bottom: 1rem;
}

.author-card h2 a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

.author-card h2 a:hover {
    color: var(--primary-color);
    opacity: 0.8;
}

.author-description {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

.books-count {
    background-color: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.9rem;
    display: inline-block;
}

/* Список книг */
.books-list {
    display: grid;
    gap: 2rem;
    margin-top: 2rem;
}

.book-item {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.book-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.book-item h3 {
    margin-bottom: 1rem;
}

.book-item h3 a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

.book-item h3 a:hover {
    color: var(--primary-color);
    opacity: 0.8;
}

.book-item p {
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* Информация о книге */
.book-info {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.book-info p {
    margin: 0;
}

.book-info a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

.book-info a:hover {
    color: var(--primary-color);
    opacity: 0.8;
}

/* Содержание */
.table-of-contents {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
}

.table-of-contents h2 {
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.chapters-list {
    list-style: none;
}

.chapters-list li {
    margin-bottom: 0.75rem;
}

.chapters-list a {
    color: var(--primary-color);
    text-decoration: none;
    padding: 0.5rem 0;
    display: block;
    transition: all 0.2s ease;
    border-radius: 4px;
}

.chapters-list a:hover {
    background-color: var(--primary-color);
    color: white;
    padding-left: 1rem;
}

/* Контент главы */
.chapter-content {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
}

.chapter-content h2 {
    margin-bottom: 1rem;
    color: var(--text-color);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.chapter-content p {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* Навигация по главам */
.chapter-navigation {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 2rem;
}

.nav-btn {
    background-color: var(--primary-color);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    text-align: center;
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.nav-btn:hover {
    background-color: var(--primary-color);
    opacity: 0.8;
    transform: translateY(-1px);
}

/* Заголовки разделов */
.section-title {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-color);
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

/* Мобильная адаптация */
@media (max-width: 768px) {
    .nav-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .authors-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .chapter-navigation {
        flex-direction: column;
    }
    
    .nav-btn {
        width: 100%;
    }
    
    .container {
        padding: 0 0.5rem;
    }
    
    .author-card,
    .book-item,
    .table-of-contents,
    .chapter-content {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .page-title {
        font-size: 1.75rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .author-card,
    .book-item,
    .table-of-contents,
    .chapter-content {
        padding: 1rem;
    }
    
    .nav-controls {
        flex-wrap: wrap;
        justify-content: center;
    }
}

/* Анимации */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.author-card,
.book-item {
    animation: fadeIn 0.6s ease-out;
}

/* Фокус для доступности */
.theme-btn:focus,
.font-btn:focus,
.nav-btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Печать */
@media print {
    .navbar,
    .nav-controls {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .author-card,
    .book-item,
    .table-of-contents,
    .chapter-content {
        border: 1px solid #ccc;
        box-shadow: none;
        break-inside: avoid;
    }
}