/* 读书笔记介绍页面样式 */
.notes-introduction-page {
    display: flex;
    gap: 2rem;
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

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

.page-header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem 0;
    border-bottom: 2px solid var(--border-color);
    background: linear-gradient(135deg, rgba(147, 51, 234, 0.05), rgba(59, 130, 246, 0.05));
    border-radius: 1rem;
}

.page-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #9333ea, #3b82f6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-weight: 300;
    letter-spacing: 0.5px;
}

.content-section {
    space-y: 2rem;
}

.intro-card {
    background: white;
    padding: 2.5rem;
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    margin-bottom: 2rem;
    transition: var(--transition);
}

.intro-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.section-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-title::before {
    content: "📝";
    font-size: 1.5rem;
}

.section-text {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-color);
    text-align: justify;
}

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

.importance-item {
    text-align: center;
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(147, 51, 234, 0.05), rgba(59, 130, 246, 0.05));
    border-radius: 0.75rem;
    border: 1px solid rgba(147, 51, 234, 0.1);
    transition: var(--transition);
}

.importance-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(147, 51, 234, 0.15);
}

.importance-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.importance-item h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.importance-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.status-list {
    display: grid;
    gap: 1rem;
    margin-top: 1.5rem;
}

.status-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--sidebar-bg);
    border-radius: 0.5rem;
    border-left: 4px solid var(--primary-color);
}

.status-badge {
    padding: 0.4rem 1rem;
    border-radius: 1rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: white;
    min-width: 80px;
    text-align: center;
}

.status-badge.completed {
    background: linear-gradient(135deg, #10b981, #059669);
}

.status-badge.reading {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
}

.status-badge.planned {
    background: linear-gradient(135deg, #f59e0b, #d97706);
}

.status-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* 侧边导航 */
.side-navigation {
    width: 320px;
    flex-shrink: 0;
}

.nav-card {
    background: white;
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.nav-title {
    padding: 1.5rem;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-color);
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(135deg, rgba(147, 51, 234, 0.05), rgba(59, 130, 246, 0.05));
    margin: 0;
}

.nav-menu {
    padding: 0.5rem 0;
}

.notes-nav-item {
    display: flex;
    align-items: center;
    padding: 1rem 1.5rem;
    text-decoration: none;
    color: var(--text-color);
    transition: var(--transition);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.notes-nav-item:last-child {
    border-bottom: none;
}

.notes-nav-item:hover {
    background: linear-gradient(135deg, rgba(147, 51, 234, 0.08), rgba(59, 130, 246, 0.08));
    color: var(--primary-color);
    transform: translateX(5px);
}

.nav-icon {
    font-size: 1.5rem;
    width: 2.5rem;
    text-align: center;
    margin-right: 1rem;
}

.nav-content {
    flex: 1;
}

.nav-name {
    display: block;
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 0.2rem;
}

.nav-desc {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.notes-nav-arrow {
    font-size: 1.2rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.notes-nav-item:hover .notes-nav-arrow {
    color: var(--primary-color);
    transform: translateX(3px);
}

/*.stats-card {*/
/*    background: linear-gradient(135deg, rgba(147, 51, 234, 0.05), rgba(59, 130, 246, 0.05));*/
/*    border: 1px solid rgba(147, 51, 234, 0.1);*/
/*}*/

/*.stats-grid {*/
/*    display: grid;*/
/*    grid-template-columns: repeat(3, 1fr);*/
/*    gap: 1rem;*/
/*    padding: 1rem 1.5rem 1.5rem;*/
/*}*/

/*.stat-item {*/
/*    text-align: center;*/
/*}*/

/*.stat-number {*/
/*    font-size: 1.8rem;*/
/*    font-weight: 800;*/
/*    color: var(--primary-color);*/
/*    margin-bottom: 0.2rem;*/
/*}*/

/*.stat-label {*/
/*    font-size: 0.8rem;*/
/*    color: var(--text-secondary);*/
/*    font-weight: 500;*/
/*}*/

/* 响应式设计 */
@media (max-width: 1024px) {
    .notes-introduction-page {
        flex-direction: column;
    }

    .side-navigation {
        width: 100%;
    }

    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .notes-introduction-page {
        padding: 1rem;
    }

    .page-title {
        font-size: 2.2rem;
    }

    .importance-grid {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
}