/* Стили для карточек предметов */
.subject-card-link {
    text-decoration: none;
    color: var(--text-color);
    display: block;
    transition: transform 0.2s ease;
    margin-bottom: 2rem;
}
.subject-card-link:hover {
    transform: translateY(-5px);
}
.subject-card {
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: 0 4px 16px var(--shadow-color, rgba(0, 0, 0, 0.1));
    transition: box-shadow 0.3s, transform 0.2s;
    height: 100%;
    overflow: hidden;
    position: relative;
    padding: 2rem 1.5rem 1.5rem 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}
.subject-card-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.7rem;
}
.subject-card-description {
    color: var(--text-muted);
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

/* Стили для страницы деталей предмета */
h1 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-weight: 700;
    font-size: 2.5rem;
}

.subject-description {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.search-container {
    position: relative;
    margin-bottom: 2rem;
}

.search-container input {
    padding: 0.8rem 1rem;
    border-radius: 10px;
    border: 2px solid var(--border-color);
    font-size: 1rem;
    transition: all 0.3s ease;
    background: var(--card-bg);
    color: var(--text-color);
}

.search-container input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(var(--primary-color-rgb), 0.1);
    outline: none;
}

.search-container input::placeholder {
    color: var(--text-muted);
}

.admin-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

/* Улучшенные стили для разделов */
.section-block {
    margin-bottom: 2rem;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--card-bg) 0%, rgba(var(--primary-color-rgb), 0.05) 100%);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px var(--shadow-color, rgba(0, 0, 0, 0.1));
    position: relative;
    overflow: hidden;
}

.section-block::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color), var(--primary-color));
    background-size: 200% 100%;
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

/* Улучшенная кнопка переключения раздела */
.toggle-section {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: var(--light-color);
    border: none;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    font-size: 1.1rem;
    cursor: pointer;
    margin-bottom: 1rem;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(var(--primary-color-rgb), 0.3);
    transition: all 0.3s ease;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    text-align: left;
    overflow: hidden;
}

.toggle-section::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;
}

.toggle-section:hover::before {
    left: 100%;
}

.toggle-section:hover {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    box-shadow: 0 6px 20px rgba(var(--primary-color-rgb), 0.4);
    transform: translateY(-2px);
}

.toggle-section:active {
    transform: translateY(0);
}

.item-count {
    font-size: 0.9rem;
    opacity: 0.8;
    font-weight: 400;
    background: rgba(255,255,255,0.2);
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
}

/* Иконка для кнопки */
.toggle-section::after {
    content: '▼';
    font-size: 0.8rem;
    transition: transform 0.3s ease;
    margin-left: 0.5rem;
}

.toggle-section.open::after {
    transform: rotate(180deg);
}

/* Действия раздела */
.section-actions {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

/* Стили для списка элементов */
.item-list {
    list-style: none;
    padding: 0;
    margin: 0;
    max-height: 0;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    transform: translateY(-10px);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.05);
}

.section-block.open .item-list {
    max-height: none;
    opacity: 1;
    transform: translateY(0);
    /* padding: 1.5rem; */
    margin-top: 0.5rem;
    /* border: 1px solid var(--border-color); */
    background: var(--card-bg);
}

.item-list li {
    margin-bottom: 1rem;
    padding: 1rem;
    background: linear-gradient(135deg, var(--card-bg) 0%, rgba(var(--primary-color-rgb), 0.02) 100%);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px var(--shadow-color, rgba(0, 0, 0, 0.1));
    position: relative;
    overflow: hidden;
}

.item-list li::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary-color), var(--accent-color));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.item-list li:hover {
    box-shadow: 0 6px 20px var(--shadow-color, rgba(0, 0, 0, 0.15));
    transform: translateY(-2px);
    /* border-color: var(--primary-color); */
}

.item-list li:hover::before {
    opacity: 1;
}

.item-list li:last-child {
    margin-bottom: 0;
}

/* Контент элемента */
.item-content {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
}

.item-main {
    flex: 1;
    min-width: 0;
}

.item-link {
    text-decoration: none;
    color: var(--text-color);
    display: block;
    font-weight: 600;
    font-size: 1.1rem;
    transition: color 0.2s ease;
    margin-bottom: 0.5rem;
}

.item-link:hover {
    color: var(--primary-color);
}

.item-preview {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-top: 0.5rem;
    padding: 0.5rem;
    background: rgba(var(--primary-color-rgb), 0.05);
    border-radius: 6px;
    border-left: 3px solid var(--primary-color);
}

.item-actions {
    display: flex;
    gap: 0.5rem;
    flex-shrink: 0;
    margin-top: 0.5rem;
}

/* Пустые состояния */
.empty-state {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    background: rgba(var(--primary-color-rgb), 0.05);
    border-radius: 12px;
    border: 2px dashed var(--border-color);
}

.empty-state p {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

/* Кнопки действий */
.btn {
    border-radius: 8px;
    font-size: 1rem;
    padding: 0.5rem 1.2rem;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    margin: 0.2rem;
    position: relative;
    overflow: hidden;
}

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

.btn-success {
    background: linear-gradient(135deg, var(--success-color), var(--secondary-color));
    color: var(--light-color);
}

.btn-success:hover {
    background: linear-gradient(135deg, var(--success-color), var(--secondary-color));
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(var(--success-color-rgb), 0.4);
}

.btn-outline-primary {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
}

.btn-outline-primary:hover {
    background: var(--primary-color);
    color: var(--light-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(var(--primary-color-rgb), 0.4);
}

.btn-outline-danger {
    border: 2px solid var(--danger-color);
    color: var(--danger-color);
    background: transparent;
}

.btn-outline-danger:hover {
    background: var(--danger-color);
    color: var(--light-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(var(--danger-color-rgb), 0.4);
}

.btn-outline-success {
    border: 2px solid var(--success-color);
    color: var(--success-color);
    background: transparent;
}

.btn-outline-success:hover {
    background: var(--success-color);
    color: var(--light-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(var(--success-color-rgb), 0.4);
}

/* Анимация для плавного появления элементов */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section-items.open .item-list li {
    animation: fadeInUp 0.4s ease forwards;
}

.section-items.open .item-list li:nth-child(1) { animation-delay: 0.1s; }
.section-items.open .item-list li:nth-child(2) { animation-delay: 0.2s; }
.section-items.open .item-list li:nth-child(3) { animation-delay: 0.3s; }
.section-items.open .item-list li:nth-child(4) { animation-delay: 0.4s; }
.section-items.open .item-list li:nth-child(5) { animation-delay: 0.5s; }

/* Адаптивность */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }
    
    .section-block {
        padding: 1rem;
        margin-bottom: 1.5rem;
    }
    
    .toggle-section {
        font-size: 1rem;
        padding: 0.8rem 1.2rem;
    }
    
    .item-list li {
        padding: 0.8rem;
        margin-bottom: 0.8rem;
    }
    
    .item-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.8rem;
    }
    
    .item-actions {
        align-self: flex-end;
        margin-top: 0;
    }
    
    .section-actions {
        flex-direction: column;
    }
    
    .admin-actions {
        flex-direction: column;
    }
    
    .item-preview {
        font-size: 0.85rem;
        padding: 0.4rem;
    }
}

.highlight {
    background: var(--accent-color, #ffe066);
    color: var(--text-color);
    border-radius: 4px;
    padding: 0 2px;
    font-weight: bold;
    transition: background 0.2s;
}

body.dark .highlight {
    background: var(--accent-color, #ffd54f);
    color: var(--text-color);
}

/* Навигационные кнопки */
.navigation-buttons {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid var(--border-color);
}

.nav-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1rem 1.5rem;
    background: linear-gradient(135deg, var(--card-bg) 0%, rgba(var(--primary-color-rgb), 0.05) 100%);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px var(--shadow-color, rgba(0, 0, 0, 0.1));
    position: relative;
    overflow: hidden;
    min-width: 200px;
}

.nav-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(var(--primary-color-rgb), 0.1), transparent);
    transition: left 0.5s;
}

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

.nav-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--shadow-color, rgba(0, 0, 0, 0.15));
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.nav-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: var(--hover-bg);
}

.nav-btn.disabled:hover {
    transform: none;
    box-shadow: 0 2px 8px var(--shadow-color, rgba(0, 0, 0, 0.1));
    border-color: var(--border-color);
    color: var(--text-muted);
}

.nav-btn.disabled::before {
    display: none;
}

.nav-btn i {
    font-size: 1.2rem;
    transition: transform 0.3s ease;
}

.nav-btn:hover i {
    transform: scale(1.1);
}

.nav-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.nav-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-title {
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.3;
}

.nav-prev {
    text-align: left;
}

.nav-next {
    text-align: right;
    flex-direction: row-reverse;
}

.nav-next .nav-text {
    align-items: flex-end;
}

/* Кнопки "Назад" */
.back-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.back-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: var(--light-color);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(var(--primary-color-rgb), 0.3);
    position: relative;
    overflow: hidden;
}

.back-btn::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;
}

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

.back-btn:hover {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(var(--primary-color-rgb), 0.4);
    color: var(--light-color);
}

.back-btn i {
    font-size: 1rem;
    transition: transform 0.3s ease;
}

.back-btn:hover i {
    transform: scale(1.1);
}

.back-to-subject {
    background: linear-gradient(135deg, var(--success-color), var(--secondary-color));
}

.back-to-subject:hover {
    background: linear-gradient(135deg, var(--success-color), var(--secondary-color));
    box-shadow: 0 4px 12px rgba(var(--success-color-rgb), 0.4);
}

.back-to-subjects {
    background: linear-gradient(135deg, var(--info-color), var(--accent-color));
}

.back-to-subjects:hover {
    background: linear-gradient(135deg, var(--info-color), var(--accent-color));
    box-shadow: 0 4px 12px rgba(var(--info-color-rgb), 0.4);
}

/* Адаптивность для навигации */
@media (max-width: 768px) {
    .nav-row {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-btn {
        width: 100%;
        min-width: auto;
        justify-content: center;
    }
    
    .nav-next {
        flex-direction: row;
    }
    
    .nav-next .nav-text {
        align-items: flex-start;
    }
    
    .back-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .back-btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
}

/* Стили для связанных конспектов */
.topic-group {
    margin-bottom: 2rem;
}

.topic-group h4 {
    color: var(--primary-color);
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
    position: relative;
}

.topic-group h4::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 50px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color), transparent);
}

.conspects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.conspect-item {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.conspect-item:hover {
    transform: translateY(-5px);
}

.conspect-link {
    text-decoration: none;
    color: inherit;
    display: block;
    height: 100%;
}

.conspect-card {
    background: linear-gradient(135deg, var(--card-bg) 0%, rgba(var(--primary-color-rgb), 0.05) 100%);
    border-radius: 16px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 16px var(--shadow-color, rgba(0, 0, 0, 0.1));
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    height: 100%;
}

.conspect-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--secondary-color), var(--conspect-border), var(--secondary-color));
    background-size: 200% 100%;
    animation: shimmer 3s infinite;
}

.conspect-card:hover {
    box-shadow: 0 8px 32px rgba(var(--primary-color-rgb), 0.2);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.conspect-card h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-color);
    line-height: 1.4;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.badge-special {
    background: linear-gradient(45deg, var(--warning-color), var(--warning-color));
    color: var(--light-color);
    font-size: 0.8rem;
    padding: 0.2rem 0.5rem;
    border-radius: 12px;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(var(--warning-color-rgb), 0.3);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.conspect-meta {
    display: flex;
    gap: 1rem;
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: auto;
}

.conspect-meta span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.3rem 0.6rem;
    background: rgba(var(--primary-color-rgb), 0.1);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.conspect-meta .views {
    background: rgba(var(--success-color-rgb), 0.1);
    color: var(--success-color);
}

.conspect-meta .date {
    background: rgba(var(--warning-color-rgb), 0.1);
    color: var(--warning-color);
}

.conspect-card:hover .conspect-meta span {
    background: rgba(var(--primary-color-rgb), 0.2);
    transform: translateY(-1px);
}

/* Адаптивность для связанных конспектов */
@media (max-width: 768px) {
    .conspects-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .conspect-card {
        padding: 1rem;
    }
    
    .conspect-card h4 {
        font-size: 1rem;
    }
    
    .conspect-meta {
        flex-direction: column;
        gap: 0.5rem;
        align-items: flex-start;
    }
    
    .topic-group h4 {
        font-size: 1.2rem;
    }
}

/* Стили для заголовка "Связанные конспекты" */
.related-conspects {
    background: linear-gradient(135deg, var(--card-bg) 0%, rgba(var(--primary-color-rgb), 0.03) 100%);
    border-radius: 20px;
    padding: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px var(--shadow-color, rgba(0, 0, 0, 0.1));
    margin-top: 3rem;
}

.related-conspects h2 {
    color: var(--primary-color);
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 2rem;
    text-align: center;
    position: relative;
    padding-bottom: 1rem;
}

.related-conspects h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color), var(--primary-color));
    border-radius: 2px;
}

/* Адаптивность для связанных конспектов */
@media (max-width: 768px) {
    .related-conspects {
        padding: 1.5rem;
        margin-top: 2rem;
    }
    
    .related-conspects h2 {
        font-size: 1.5rem;
        margin-bottom: 1.5rem;
    }
}