/* ==========================================================================
   Chapter Page Styles
   ========================================================================== */

/* ==========================================================================
   Layout
   ========================================================================== */
.chapter-layout {
    display: flex;
    padding-top: var(--navbar-height);
    min-height: 100vh;
    background: var(--color-bg);
}

/* ==========================================================================
   Sidebar
   ========================================================================== */
.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    bottom: 0;
    background: var(--color-bg-secondary);
    border-right: 1px solid var(--color-border-light);
    overflow-y: auto;
    transition: transform var(--transition-base);
    z-index: 100;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--color-border-light);
    position: sticky;
    top: 0;
    background: var(--color-bg-secondary);
    z-index: 10;
}

.sidebar-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.sidebar-toggle {
    display: none;
}

.sidebar-nav {
    padding: var(--space-md) 0;
}

.sidebar-chapter {
    padding: 0 var(--space-md);
}

.chapter-label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    color: var(--color-accent);
    padding: var(--space-sm) var(--space-md);
    margin-bottom: var(--space-xs);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.article-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.article-list a {
    display: block;
    padding: var(--space-sm) var(--space-md);
    font-size: 14px;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    position: relative;
}

.article-list a:hover {
    background: var(--color-bg);
    color: var(--color-text);
}

.article-list a.active {
    background: var(--color-bg);
    color: var(--color-accent);
    font-weight: 600;
    border-left: 3px solid var(--color-accent);
    padding-left: calc(var(--space-md) - 3px);
}

/* Sidebar collapsed state */
.sidebar.collapsed {
    transform: translateX(-100%);
}

@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
        box-shadow: var(--shadow-lg);
    }
    
    .sidebar-toggle {
        display: flex;
    }
}

/* ==========================================================================
   Article Content
   ========================================================================== */
.article-content {
    flex: 1;
    min-width: 0;
    padding: var(--space-2xl) var(--space-2xl);
    max-width: 800px;
    margin: 0 auto;
    background: var(--color-bg);
}

/* Breadcrumb */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 13px;
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-lg);
}

.breadcrumb a {
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

.breadcrumb a:hover {
    color: var(--color-accent);
}

.breadcrumb .separator {
    opacity: 0.5;
}

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

/* ==========================================================================
   Article Header
   ========================================================================== */
.article-header {
    margin-bottom: var(--space-2xl);
}

.article-meta {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.meta-tag {
    padding: 6px 14px;
    background: var(--color-accent);
    color: white;
    font-size: 12px;
    font-weight: 500;
    border-radius: 20px;
}

.meta-time {
    font-size: 13px;
    color: var(--color-text-tertiary);
}

.article-title {
    font-size: 38px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
    color: var(--color-text);
}

.article-desc {
    font-size: 17px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ==========================================================================
   Article Cover
   ========================================================================== */
.article-cover {
    margin-bottom: 40px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.cover-image {
    width: 100%;
    aspect-ratio: 2 / 1;
    background: var(--color-bg-secondary);
}

.cover-image svg {
    width: 100%;
    height: 100%;
}

@media (max-width: 768px) {
    .article-content {
        padding: var(--space-lg);
    }
    
    .article-title {
        font-size: 28px;
    }
    
    .article-desc {
        font-size: 16px;
    }
}

/* ==========================================================================
   Article Body
   ========================================================================== */
.article-body {
    font-size: 16px;
    line-height: 1.8;
    color: var(--color-text);
}

.content-section {
    margin-bottom: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border-light);
}

.content-section:first-of-type {
    padding-top: 0;
    border-top: none;
}

.content-section h2 {
    font-size: 26px;
    font-weight: 600;
    margin-bottom: 24px;
    padding-top: 0;
    color: var(--color-text);
    position: relative;
    padding-left: 20px;
}

.content-section h2::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 24px;
    background: var(--color-accent);
    border-radius: 2px;
}

.content-section h2:first-child {
    padding-top: 0;
}

.content-section h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
    margin-top: 32px;
    color: var(--color-text);
}

.content-section p {
    margin-bottom: 20px;
    color: var(--color-text-secondary);
    font-size: 15px;
    line-height: 1.8;
}

.content-section strong {
    font-weight: 600;
    color: var(--color-text);
}

/* ==========================================================================
   Feature List
   ========================================================================== */
.feature-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin: var(--space-lg) 0;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-light);
    border-radius: 10px;
    transition: all 0.3s ease;
}

.feature-list li:hover {
    transform: translateX(8px);
    background: var(--color-bg);
    border-color: var(--color-accent);
}

.feature-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-gradient);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.feature-icon svg {
    width: 20px;
    height: 20px;
    color: white;
}

.feature-text {
    display: flex;
    flex-direction: column;
}

.feature-text strong {
    font-size: 16px;
    margin-bottom: 2px;
}

.feature-text span {
    font-size: 14px;
    color: var(--color-text-secondary);
}

/* ==========================================================================
   Comparison Table
   ========================================================================== */
.comparison-table {
    margin: var(--space-md) 0;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.table-header {
    display: grid;
    grid-template-columns: 1.5fr 2fr 2fr;
    background: var(--color-bg-secondary);
    font-weight: 600;
    font-size: 14px;
}

.table-header .th {
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--color-border-light);
}

.table-header .th:not(:last-child) {
    border-right: 1px solid var(--color-border-light);
}

.table-row {
    display: grid;
    grid-template-columns: 1.5fr 2fr 2fr;
    font-size: 14px;
}

.table-row:not(:last-child) {
    border-bottom: 1px solid var(--color-border-light);
}

.table-row .td {
    padding: var(--space-md) var(--space-lg);
}

.table-row .td:not(:last-child) {
    border-right: 1px solid var(--color-border-light);
}

.table-row:nth-child(even) {
    background: var(--color-bg-secondary);
}

/* ==========================================================================
   Scenario Card
   ========================================================================== */
.scenario-card {
    margin: var(--space-md) 0;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.scenario-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--color-accent-gradient);
    color: white;
}

.scenario-icon {
    font-size: 24px;
}

.scenario-title {
    font-size: 16px;
    font-weight: 600;
}

.scenario-content {
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.scenario-item {
    display: flex;
    gap: var(--space-md);
}

.scenario-num {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent);
    color: white;
    font-size: 14px;
    font-weight: 600;
    border-radius: 50%;
    flex-shrink: 0;
}

.scenario-text strong {
    display: block;
    margin-bottom: 4px;
}

.scenario-text p {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin: 0;
}

/* ==========================================================================
   Highlight Box
   ========================================================================== */
.highlight-box {
    padding: var(--space-lg) !important;
    background: linear-gradient(135deg, rgba(94, 92, 230, 0.1), rgba(10, 132, 255, 0.1)) !important;
    border-left: 4px solid var(--color-accent) !important;
    border-radius: var(--radius-sm) !important;
    margin: var(--space-lg) 0 !important;
}

/* ==========================================================================
   Info Grid
   ========================================================================== */
.info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    margin: var(--space-md) 0;
}

.info-card {
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-light);
}

.info-card.success {
    background: rgba(52, 199, 89, 0.05);
    border-color: rgba(52, 199, 89, 0.2);
}

.info-card.warning {
    background: rgba(255, 149, 0, 0.05);
    border-color: rgba(255, 149, 0, 0.2);
}

.info-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-md);
}

.info-card.success .info-icon {
    background: rgba(52, 199, 89, 0.1);
    color: var(--color-success);
}

.info-card.warning .info-icon {
    background: rgba(255, 149, 0, 0.1);
    color: var(--color-warning);
}

.info-icon svg {
    width: 20px;
    height: 20px;
}

.info-card h4 {
    font-size: 16px;
    margin-bottom: var(--space-sm);
}

.info-card ul {
    font-size: 14px;
    color: var(--color-text-secondary);
}

.info-card li {
    margin-bottom: var(--space-xs);
}

@media (max-width: 768px) {
    .info-grid {
        grid-template-columns: 1fr;
    }
}

/* ==========================================================================
   Flow Diagram
   ========================================================================== */
.flow-diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin: var(--space-md) 0;
    padding: var(--space-md);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
}

.flow-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-md);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    min-width: 100px;
    text-align: center;
}

.flow-icon {
    font-size: 24px;
    margin-bottom: var(--space-xs);
}

.flow-content strong {
    display: block;
    font-size: 14px;
    margin-bottom: 2px;
}

.flow-content span {
    font-size: 12px;
    color: var(--color-text-secondary);
}

.flow-arrow {
    color: var(--color-accent);
    font-size: 20px;
    font-weight: bold;
}

@media (max-width: 768px) {
    .flow-diagram {
        flex-direction: column;
    }
    
    .flow-arrow {
        transform: rotate(90deg);
    }
}

/* ==========================================================================
   Scene Grid
   ========================================================================== */
.scene-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    margin: var(--space-md) 0;
}

.scene-card {
    padding: var(--space-lg);
    background: var(--color-bg);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.scene-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.scene-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-gradient);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-md);
}

.scene-icon svg {
    width: 22px;
    height: 22px;
    color: white;
}

.scene-card h4 {
    font-size: 16px;
    margin-bottom: var(--space-sm);
}

.scene-card p {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin: 0;
}

@media (max-width: 768px) {
    .scene-grid {
        grid-template-columns: 1fr;
    }
}

/* ==========================================================================
   FAQ List
   ========================================================================== */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin: var(--space-lg) 0;
}

.faq-item {
    padding: var(--space-lg);
    background: var(--color-bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--color-border-light);
    transition: all 0.3s ease;
}

.faq-item:hover {
    border-color: var(--color-accent);
}

.faq-question {
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--color-text);
}

.faq-question span {
    color: var(--color-accent);
    margin-right: var(--space-sm);
    font-weight: 600;
}

.faq-answer {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    padding-left: 24px;
    border-left: 2px solid var(--color-accent);
}

.faq-answer span {
    color: var(--color-accent);
    font-weight: 600;
    margin-right: var(--space-sm);
}

/* ==========================================================================
   Article Navigation
   ========================================================================== */
.article-nav {
    display: flex;
    justify-content: space-between;
    gap: var(--space-lg);
    padding-top: 40px;
    margin-top: 40px;
    border-top: 1px solid var(--color-border-light);
}

.nav-prev,
.nav-next {
    flex: 1;
}

.nav-next {
    text-align: right;
}

.article-nav-link {
    display: block;
    padding: var(--space-lg) var(--space-xl);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-light);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.article-nav-link:hover {
    background: var(--color-bg);
    border-color: var(--color-accent);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.nav-label {
    display: block;
    font-size: 12px;
    color: var(--color-accent);
    margin-bottom: var(--space-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nav-title {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text);
}

.nav-link .nav-title {
    color: inherit;
}

@media (max-width: 768px) {
    .article-nav {
        flex-direction: column;
    }
    
    .nav-next {
        text-align: left;
    }
}

/* ==========================================================================
   Reading Progress Indicator
   ========================================================================== */
.reading-progress {
    position: fixed;
    top: 50%;
    right: 24px;
    transform: translateY(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.progress-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(167, 139, 250, 0.3);
    transition: all 0.3s ease;
    cursor: pointer;
}

.progress-dot:hover {
    background: rgba(167, 139, 250, 0.6);
    transform: scale(1.3);
}

.progress-dot.active {
    background: #A78BFA;
    box-shadow: 0 0 12px rgba(167, 139, 250, 0.6);
}

/* ==========================================================================
   Enhanced Code Blocks
   ========================================================================== */
.content-section pre {
    background: #f6f8fa;
    border: 1px solid #e1e4e8;
    border-radius: 6px;
    padding: 16px;
    overflow-x: auto;
    margin: 16px 0;
}

.content-section pre code {
    font-family: 'SF Mono', 'Menlo', 'Monaco', 'Consolas', monospace;
    font-size: 13px;
    line-height: 1.5;
    color: #24292e;
    background: transparent;
}

/* ==========================================================================
   Enhanced Tables
   ========================================================================== */
.content-section table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--color-border-light);
}

.content-section table th {
    background: var(--color-accent);
    color: white;
    font-weight: 600;
    padding: 14px 16px;
    text-align: left;
}

.content-section table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--color-border-light);
    color: var(--color-text-secondary);
}

.content-section table tr:hover td {
    background: var(--color-bg-secondary);
}

/* ==========================================================================
   Enhanced Blockquotes / Tips
   ========================================================================== */
.content-section blockquote {
    background: var(--color-bg-secondary);
    border-left: 4px solid var(--color-accent);
    padding: 16px 20px;
    margin: 20px 0;
    border-radius: 0 10px 10px 0;
}

.content-section blockquote p {
    margin: 0;
    color: var(--color-text-secondary);
}

/* ==========================================================================
   Enhanced Lists
   ========================================================================== */
.content-section ul,
.content-section ol {
    margin: 16px 0;
    padding-left: 24px;
}

.content-section ul {
    list-style: none;
}

.content-section ul li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 10px;
    color: var(--color-text-secondary);
}

.content-section ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    background: var(--color-accent);
    border-radius: 50%;
}

.content-section ol {
    list-style: none;
    counter-reset: list-counter;
}

.content-section ol li {
    counter-increment: list-counter;
    position: relative;
    padding-left: 32px;
    margin-bottom: 10px;
    color: var(--color-text-secondary);
}

.content-section ol li::before {
    content: counter(list-counter);
    position: absolute;
    left: 0;
    top: 0;
    width: 22px;
    height: 22px;
    background: #0071E3;
    border-radius: 50%;
    color: white;
    font-size: 12px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
}

.content-section li {
    line-height: 1.7;
}

/* ==========================================================================
   Info/Warning Boxes
   ========================================================================== */
.info-box {
    background: rgba(0, 113, 227, 0.06);
    border: 1px solid rgba(0, 113, 227, 0.15);
    border-radius: 10px;
    padding: 16px 20px;
    margin: 20px 0;
}

.warning-box {
    background: rgba(255, 149, 0, 0.06);
    border: 1px solid rgba(255, 149, 0, 0.15);
    border-radius: 10px;
    padding: 16px 20px;
    margin: 20px 0;
}