@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;600;700&family=Noto+Serif+SC:wght@400;600;700&display=swap');

:root {
    --bg-base: #f7f8fa;
    --bg-primary: #ffffff;
    --bg-secondary: #fafbfc;
    --bg-tertiary: #f0f2f5;
    --bg-hover: #eef0f4;
    --bg-active: #e8ebf0;
    --text-primary: #1f2329;
    --text-secondary: #646a73;
    --text-tertiary: #8f959e;
    --text-placeholder: #bbbfc4;
    --border-primary: #e5e6eb;
    --border-secondary: #eff0f1;
    --accent-primary: #3370ff;
    --accent-secondary: #5c8dff;
    --accent-light: #e1eaff;
    --accent-lighter: #f0f5ff;
    --accent-gradient: linear-gradient(135deg, #3370ff 0%, #5e3bff 100%);
    --success: #00b42a;
    --warning: #ff7d00;
    --error: #f53f3f;
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.04), 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.06), 0 4px 8px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 16px 32px rgba(0, 0, 0, 0.08), 0 8px 16px rgba(0, 0, 0, 0.04);
    --radius-xs: 4px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --sidebar-width: 260px;
    --sidebar-collapsed: 64px;
    --toc-width: 220px;
    --header-height: 56px;
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
    --font-serif: 'Noto Serif SC', 'Source Serif 4', Georgia, 'Times New Roman', serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', Consolas, 'Liberation Mono', Menlo, monospace;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.75;
    color: var(--text-primary);
    background: var(--bg-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

#app {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-primary);
    border-right: 1px solid var(--border-secondary);
    display: flex;
    flex-direction: column;
    transition: width var(--transition-normal);
    z-index: 100;
    overflow: hidden;
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed);
}

.sidebar-header {
    height: var(--header-height);
    padding: 0 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-secondary);
    flex-shrink: 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    overflow: hidden;
}

.logo-icon {
    width: 28px;
    height: 28px;
    color: var(--accent-primary);
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.logo:hover .logo-icon {
    transform: rotate(-5deg) scale(1.05);
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    white-space: nowrap;
    letter-spacing: -0.02em;
}

.toggle-btn {
    width: 28px;
    height: 28px;
    border: none;
    background: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.toggle-btn:hover {
    background: var(--bg-hover);
}

.toggle-btn svg {
    width: 16px;
    height: 16px;
    color: var(--text-tertiary);
    transition: transform var(--transition-normal);
}

.sidebar.collapsed .toggle-btn svg {
    transform: rotate(180deg);
}

.nav-menu {
    flex: 1;
    padding: 12px 8px;
    overflow-y: auto;
    overflow-x: hidden;
}

.nav-menu::-webkit-scrollbar {
    width: 4px;
}

.nav-menu::-webkit-scrollbar-thumb {
    background: var(--border-primary);
    border-radius: 2px;
}

.nav-section {
    margin-bottom: 20px;
}

.nav-section-title {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-tertiary);
    padding: 0 12px;
    margin-bottom: 6px;
    white-space: nowrap;
    overflow: hidden;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 400;
    transition: all var(--transition-fast);
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
}

.nav-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--accent-lighter);
    color: var(--accent-primary);
    font-weight: 500;
}

.nav-item.active .nav-icon {
    color: var(--accent-primary);
}

.nav-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    color: var(--text-tertiary);
    transition: color var(--transition-fast);
}

.nav-text {
    overflow: hidden;
    text-overflow: ellipsis;
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    margin-right: var(--toc-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: margin var(--transition-normal);
}

.page-header {
    position: sticky;
    top: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid var(--border-secondary);
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 50;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
}

.breadcrumb a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
    padding: 4px 6px;
    margin: -4px -6px;
    border-radius: var(--radius-sm);
}

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

.breadcrumb .separator {
    color: var(--text-placeholder);
    font-size: 10px;
}

.search-box {
    position: relative;
    width: 260px;
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    color: var(--text-tertiary);
    pointer-events: none;
}

.search-box input {
    width: 100%;
    height: 36px;
    padding: 0 14px 0 38px;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    background: var(--bg-secondary);
    font-size: 13px;
    font-family: inherit;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.search-box input:hover {
    border-color: var(--text-placeholder);
}

.search-box input:focus {
    outline: none;
    border-color: var(--accent-primary);
    background: var(--bg-primary);
    box-shadow: 0 0 0 3px var(--accent-lighter);
}

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

.page-content {
    flex: 1;
    padding: 40px 56px;
    background: var(--bg-primary);
    margin: 20px 28px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-secondary);
}

.page-content h1 {
    font-family: var(--font-serif);
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.35;
    letter-spacing: -0.01em;
}

.page-content h1 + p {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-secondary);
}

.page-content h2 {
    font-family: var(--font-serif);
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 40px;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-secondary);
    letter-spacing: -0.005em;
}

.page-content h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 28px;
    margin-bottom: 12px;
}

.page-content h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 20px;
    margin-bottom: 8px;
}

.page-content p {
    margin-bottom: 14px;
    color: var(--text-secondary);
}

.page-content a {
    color: var(--accent-primary);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: all var(--transition-fast);
}

.page-content a:hover {
    border-bottom-color: var(--accent-secondary);
}

.page-content ul,
.page-content ol {
    margin-bottom: 14px;
    padding-left: 20px;
}

.page-content li {
    margin-bottom: 6px;
    color: var(--text-secondary);
}

.page-content li::marker {
    color: var(--text-tertiary);
}

.page-content blockquote {
    margin: 20px 0;
    padding: 14px 20px;
    background: var(--bg-secondary);
    border-left: 3px solid var(--accent-primary);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

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

.page-content blockquote p + p {
    margin-top: 10px;
}

.page-content code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    padding: 2px 6px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-xs);
    color: var(--accent-primary);
}

.page-content pre {
    margin: 20px 0;
    padding: 18px 22px;
    background: #1e2030;
    border-radius: var(--radius-lg);
    overflow-x: auto;
    box-shadow: var(--shadow-md);
}

.page-content pre code {
    background: none;
    padding: 0;
    color: #e4e7ed;
    font-size: 13px;
    line-height: 1.65;
}

.page-content table {
    width: 100%;
    margin: 20px 0;
    border-collapse: collapse;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xs);
    border: 1px solid var(--border-secondary);
}

.page-content th {
    background: var(--bg-tertiary);
    padding: 11px 16px;
    text-align: left;
    font-weight: 600;
    font-size: 13px;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-primary);
}

.page-content td {
    padding: 11px 16px;
    border-bottom: 1px solid var(--border-secondary);
    color: var(--text-secondary);
    font-size: 14px;
}

.page-content tr:last-child td {
    border-bottom: none;
}

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

.page-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    margin: 20px 0;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-secondary);
}

.page-content hr {
    border: none;
    height: 1px;
    background: var(--border-secondary);
    margin: 36px 0;
}

.page-content .callout {
    margin: 20px 0;
    padding: 16px 20px;
    border-radius: var(--radius-lg);
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.page-content .callout-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    margin-top: 1px;
}

.page-content .callout-content {
    flex: 1;
}

.page-content .callout-content p {
    margin: 0;
}

.page-content .callout.info {
    background: #e8f3ff;
    border: 1px solid #b3d8ff;
}

.page-content .callout.info .callout-icon {
    color: #3370ff;
}

.page-content .callout.success {
    background: #e8ffea;
    border: 1px solid #b3ffb8;
}

.page-content .callout.success .callout-icon {
    color: #00b42a;
}

.page-content .callout.warning {
    background: #fff7e8;
    border: 1px solid #ffd6b3;
}

.page-content .callout.warning .callout-icon {
    color: #ff7d00;
}

.page-content .callout.error {
    background: #ffe8e8;
    border: 1px solid #ffb3b3;
}

.page-content .callout.error .callout-icon {
    color: #f53f3f;
}

.page-footer {
    padding: 20px 28px;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-secondary);
    margin: 0 28px 20px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xs);
}

.footer-nav {
    display: flex;
    justify-content: space-between;
    gap: 16px;
}

.footer-nav-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition-fast);
    border: 1px solid var(--border-secondary);
    flex: 1;
    max-width: 280px;
}

.footer-nav-item.prev {
    justify-content: flex-start;
}

.footer-nav-item.next {
    justify-content: flex-end;
}

.footer-nav-item:hover {
    background: var(--bg-hover);
    border-color: var(--border-primary);
    color: var(--accent-primary);
}

.footer-nav-item svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.footer-nav-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.footer-nav-label {
    font-size: 12px;
    color: var(--text-tertiary);
    font-weight: 400;
}

.footer-nav-title {
    font-size: 14px;
    font-weight: 500;
}

.footer-meta {
    font-size: 12px;
    color: var(--text-tertiary);
    text-align: center;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-secondary);
}

.toc-sidebar {
    position: fixed;
    right: 0;
    top: calc(var(--header-height) + 24px);
    width: var(--toc-width);
    padding: 0 20px;
    max-height: calc(100vh - var(--header-height) - 48px);
    overflow-y: auto;
}

.toc-sidebar::-webkit-scrollbar {
    width: 3px;
}

.toc-sidebar::-webkit-scrollbar-thumb {
    background: var(--border-primary);
    border-radius: 2px;
}

.toc-title {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-tertiary);
    margin-bottom: 12px;
    padding-left: 12px;
}

.toc-nav {
    border-left: 2px solid var(--border-secondary);
    padding-left: 0;
}

.toc-item {
    display: block;
    font-size: 13px;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 5px 12px;
    transition: all var(--transition-fast);
    border-left: 2px solid transparent;
    margin-left: -2px;
    line-height: 1.5;
}

.toc-item:hover {
    color: var(--accent-primary);
    background: var(--bg-hover);
}

.toc-item.active {
    color: var(--accent-primary);
    border-left-color: var(--accent-primary);
    background: var(--accent-lighter);
}

.toc-item.level-3 {
    padding-left: 24px;
    font-size: 12px;
}

@media (max-width: 1400px) {
    .toc-sidebar {
        display: none;
    }
    
    .main-content {
        margin-right: 0;
    }
}

@media (max-width: 900px) {
    .sidebar {
        transform: translateX(-100%);
        box-shadow: var(--shadow-xl);
    }
    
    .sidebar.collapsed {
        transform: translateX(0);
        width: var(--sidebar-collapsed);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .page-content {
        padding: 28px 24px;
        margin: 12px;
        border-radius: var(--radius-lg);
    }
    
    .page-header {
        padding: 0 16px;
    }
    
    .search-box {
        display: none;
    }
    
    .page-footer {
        margin: 0 12px 12px;
        border-radius: var(--radius-lg);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.page-content {
    animation: fadeInUp 0.35s ease-out;
}

::selection {
    background: var(--accent-light);
    color: var(--accent-primary);
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-primary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

.wiki-content {
    display: contents;
}

.feature-card {
    display: block;
    padding: 20px 24px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-lg);
    text-decoration: none;
    transition: all var(--transition-fast);
    margin-bottom: 12px;
}

.feature-card:hover {
    background: var(--bg-hover);
    border-color: var(--accent-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.feature-card h3 {
    margin: 0 0 6px 0;
    font-size: 15px;
    color: var(--text-primary);
}

.feature-card p {
    margin: 0;
    font-size: 13px;
    color: var(--text-tertiary);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 12px;
    margin: 20px 0;
}

kbd {
    display: inline-block;
    padding: 2px 6px;
    font-family: var(--font-mono);
    font-size: 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xs);
    box-shadow: 0 1px 0 var(--border-primary);
}