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

:root {
    /* macOS Tahoe Color Palette */
    --bg-color: #f5f5f7;
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(255, 255, 255, 0.18);
    --text-color: #1d1d1f;
    --text-secondary: #6e6e73;
    --accent-color: #007aff;
    --accent-hover: #0056cc;
    --surface-color: rgba(255, 255, 255, 0.85);
    --surface-hover: rgba(255, 255, 255, 0.95);
    --border-color: rgba(0, 0, 0, 0.1);
    --shadow-light: rgba(0, 0, 0, 0.05);
    --shadow-medium: rgba(0, 0, 0, 0.1);
    --shadow-heavy: rgba(0, 0, 0, 0.15);
    --navbar-bg: rgba(248, 248, 248, 0.9);
    --sidebar-bg: rgba(255, 255, 255, 0.7);
    
    /* Typography */
    --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-family-mono: 'JetBrains Mono', 'SF Mono', Monaco, Consolas, monospace;
    
    /* Font sizes - responsive scale */
    --font-size-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
    --font-size-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
    --font-size-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
    --font-size-md: clamp(1.125rem, 1rem + 0.625vw, 1.25rem);
    --font-size-lg: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
    --font-size-xl: clamp(1.5rem, 1.3rem + 1vw, 2rem);
    --font-size-2xl: clamp(1.875rem, 1.6rem + 1.375vw, 2.5rem);
    --font-size-3xl: clamp(2.25rem, 1.9rem + 1.75vw, 3rem);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Layout */
    --navbar-height: 3.5rem;
    --sidebar-width: 16rem;
    --toc-width: 14rem;
    --content-max-width: 50rem;
    --border-radius: 0.75rem;
    --border-radius-sm: 0.5rem;
    --border-radius-lg: 1rem;
    
    /* Animation */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-medium: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1c1c1e;
        --glass-bg: rgba(28, 28, 30, 0.8);
        --glass-border: rgba(255, 255, 255, 0.1);
        --text-color: #f2f2f7;
        --text-secondary: #8e8e93;
        --accent-color: #0a84ff;
        --accent-hover: #409cff;
        --surface-color: rgba(44, 44, 46, 0.85);
        --surface-hover: rgba(58, 58, 60, 0.95);
        --border-color: rgba(255, 255, 255, 0.1);
        --shadow-light: rgba(0, 0, 0, 0.2);
        --shadow-medium: rgba(0, 0, 0, 0.3);
        --shadow-heavy: rgba(0, 0, 0, 0.4);
        --navbar-bg: rgba(28, 28, 30, 0.9);
        --sidebar-bg: rgba(44, 44, 46, 0.7);
    }
}

[data-theme="light"] {
    --bg-color: #f5f5f7;
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(255, 255, 255, 0.18);
    --text-color: #1d1d1f;
    --text-secondary: #6e6e73;
    --accent-color: #007aff;
    --accent-hover: #0056cc;
    --surface-color: rgba(255, 255, 255, 0.85);
    --surface-hover: rgba(255, 255, 255, 0.95);
    --border-color: rgba(0, 0, 0, 0.1);
    --shadow-light: rgba(0, 0, 0, 0.05);
    --shadow-medium: rgba(0, 0, 0, 0.1);
    --shadow-heavy: rgba(0, 0, 0, 0.15);
    --navbar-bg: rgba(248, 248, 248, 0.9);
    --sidebar-bg: rgba(255, 255, 255, 0.7);
}

[data-theme="dark"] {
    --bg-color: #1c1c1e;
    --glass-bg: rgba(28, 28, 30, 0.8);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-color: #f2f2f7;
    --text-secondary: #8e8e93;
    --accent-color: #0a84ff;
    --accent-hover: #409cff;
    --surface-color: rgba(44, 44, 46, 0.85);
    --surface-hover: rgba(58, 58, 60, 0.95);
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-light: rgba(0, 0, 0, 0.2);
    --shadow-medium: rgba(0, 0, 0, 0.3);
    --shadow-heavy: rgba(0, 0, 0, 0.4);
    --navbar-bg: rgba(28, 28, 30, 0.9);
    --sidebar-bg: rgba(44, 44, 46, 0.7);
}

/* Base Reset & Typography */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    height: 100%;
}

body {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(circle at 25% 25%, rgba(120, 119, 198, 0.15) 0%, transparent 25%),
        radial-gradient(circle at 75% 75%, rgba(255, 119, 198, 0.15) 0%, transparent 25%);
    background-attachment: fixed;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-feature-settings: "cv02", "cv03", "cv04", "cv11";
}

/* Glass Morphism Utility */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--glass-border);
    box-shadow: 0 8px 32px var(--shadow-light);
}

/* Layout Container */
.layout-container {
    min-height: 100vh;
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    grid-template-rows: var(--navbar-height) 1fr;
    grid-template-areas: 
        "nav nav"
        "sidebar main";
    gap: 0;
}

.layout-container.has-toc {
    grid-template-columns: var(--sidebar-width) 1fr var(--toc-width);
    grid-template-areas: 
        "nav nav nav"
        "sidebar main toc";
}

/* Top Navigation */
.top-nav {
    grid-area: nav;
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
    background: var(--navbar-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-medium);
}

.site-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-color);
    text-decoration: none;
    letter-spacing: -0.02em;
    transition: all var(--transition-fast);
}

.site-title:hover {
    color: var(--accent-color);
    transform: translateY(-1px);
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.hamburger-menu,
.toc-toggle,
.theme-toggle {
    background: none;
    border: none;
    font-size: var(--font-size-lg);
    color: var(--text-color);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.hamburger-menu,
.toc-toggle {
    display: none;
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
}

.hamburger-menu:hover,
.toc-toggle:hover,
.theme-toggle:hover {
    background: var(--surface-hover);
    transform: scale(1.05);
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    width: 100%;
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-color);
    z-index: 999;
    display: none;
    box-shadow: 0 4px 16px var(--shadow-medium);
}

.mobile-menu.show {
    display: block;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.mobile-page-links {
    list-style: none;
    padding: var(--spacing-md);
}

.mobile-page-links li {
    margin-bottom: var(--spacing-sm);
}

.mobile-page-links a {
    display: block;
    padding: var(--spacing-md);
    color: var(--text-color);
    text-decoration: none;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.mobile-page-links a:hover {
    background: var(--surface-hover);
    transform: translateX(4px);
}

/* Mobile TOC */
.mobile-toc {
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    width: 100%;
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-color);
    z-index: 998;
    display: none;
    box-shadow: 0 4px 16px var(--shadow-medium);
    max-height: 70vh;
    overflow-y: auto;
}

.mobile-toc.show {
    display: block;
    animation: slideDown 0.3s ease-out;
}

.mobile-toc-content {
    padding: var(--spacing-lg);
}

.mobile-toc h3 {
    font-size: var(--font-size-md);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-color);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: var(--spacing-sm);
}

.mobile-toc ul {
    list-style: none;
    padding-left: 0;
}

.mobile-toc li {
    margin-bottom: var(--spacing-xs);
}

.mobile-toc a {
    display: block;
    padding: var(--spacing-sm);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
    font-size: var(--font-size-sm);
}

.mobile-toc a:hover {
    background: var(--surface-hover);
    color: var(--accent-color);
    transform: translateX(4px);
}

/* Sidebar */
.sidebar {
    grid-area: sidebar;
    background: var(--sidebar-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-right: 1px solid var(--border-color);
    padding: var(--spacing-xl) var(--spacing-lg);
    overflow-y: auto;
    height: calc(100vh - var(--navbar-height));
    position: sticky;
    top: var(--navbar-height);
}

.page-links {
    list-style: none;
}

.page-links li {
    margin-bottom: var(--spacing-sm);
}

.page-links a {
    display: block;
    padding: var(--spacing-md);
    color: var(--text-color);
    text-decoration: none;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.page-links a::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, var(--accent-color), transparent);
    opacity: 0.1;
    transition: left var(--transition-medium);
}

.page-links a:hover::before {
    left: 100%;
}

.page-links a:hover {
    background: var(--surface-hover);
    color: var(--accent-color);
    transform: translateX(4px);
}

/* TOC Sidebar */
.toc-sidebar {
    grid-area: toc;
    background: var(--sidebar-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-left: 1px solid var(--border-color);
    padding: var(--spacing-xl) var(--spacing-lg);
    overflow-y: auto;
    height: calc(100vh - var(--navbar-height));
    position: sticky;
    top: var(--navbar-height);
    display: none;
}

.toc h2 {
    font-size: var(--font-size-md);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-color);
}

.toc ul {
    list-style: none;
}

.toc a {
    display: block;
    padding: var(--spacing-sm) 0;
    color: var(--text-secondary);
    text-decoration: none;
    border-left: 2px solid transparent;
    padding-left: var(--spacing-md);
    transition: all var(--transition-fast);
    font-size: var(--font-size-sm);
}

.toc a:hover {
    color: var(--accent-color);
    border-left-color: var(--accent-color);
    transform: translateX(4px);
}

/* Main Content */
.main-content {
    grid-area: main;
    padding: var(--spacing-2xl);
    overflow-x: hidden;
    min-height: calc(100vh - var(--navbar-height));
}

.content-wrapper {
    max-width: var(--content-max-width);
    margin: 0 auto;
}

/* Typography Styles */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-lg);
    color: var(--text-color);
    letter-spacing: -0.02em;
}

h1 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
}

h2 {
    font-size: var(--font-size-2xl);
    margin-top: var(--spacing-2xl);
}

h3 {
    font-size: var(--font-size-xl);
    margin-top: var(--spacing-xl);
}

h4 {
    font-size: var(--font-size-lg);
    margin-top: var(--spacing-lg);
}

p {
    margin-bottom: var(--spacing-lg);
    color: var(--text-color);
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: all var(--transition-fast);
    position: relative;
}

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

a:not(.site-title):not(.page-links a):not(.mobile-page-links a):not(.toc a)::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width var(--transition-medium);
}

a:not(.site-title):not(.page-links a):not(.mobile-page-links a):not(.toc a):hover::after {
    width: 100%;
}

/* Code Blocks */
pre, code {
    font-family: var(--font-family-mono);
    font-size: var(--font-size-sm);
}

pre {
    background: var(--surface-color);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    overflow-x: auto;
    line-height: 1.5;
    box-shadow: 0 4px 16px var(--shadow-light);
}

code:not(pre code) {
    background: var(--surface-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
    font-size: 0.9em;
}

/* Lists */
ul, ol {
    margin-bottom: var(--spacing-lg);
    padding-left: var(--spacing-xl);
}

li {
    margin-bottom: var(--spacing-sm);
    color: var(--text-color);
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-lg) 0;
    background: var(--surface-color);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 4px 16px var(--shadow-light);
}

th, td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background: var(--surface-hover);
    font-weight: 600;
    color: var(--text-color);
}

/* Blockquotes */
blockquote {
    border-left: 4px solid var(--accent-color);
    padding: var(--spacing-md) var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    background: var(--surface-color);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
    font-style: italic;
    box-shadow: 0 2px 8px var(--shadow-light);
}

/* Images */
img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 16px var(--shadow-light);
    transition: transform var(--transition-medium);
}

img:hover {
    transform: scale(1.02);
}

/* Scroll to Top Button */
.scroll-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 3rem;
    height: 3rem;
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-medium);
    z-index: 1000;
    color: var(--text-color);
    font-size: var(--font-size-lg);
    font-weight: 600;
    box-shadow: 0 8px 32px var(--shadow-medium);
}

.scroll-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-to-top:hover {
    transform: translateY(-4px) scale(1.1);
    box-shadow: 0 12px 40px var(--shadow-heavy);
}

/* Post Meta */
.post-meta {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.post-tags {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.tag {
    background: var(--surface-color);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.tag:hover {
    background: var(--accent-color);
    color: white;
    transform: translateY(-2px);
}

/* Index Page Header */
.index header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-2xl) 0;
}

.index h1 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--text-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.03em;
}

/* Post List Grid */
.post-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    list-style: none;
    padding: 0;
    margin: 0;
}

.post-item {
    margin: 0;
}

/* Glassy Post Cards */
.post-card {
    display: block;
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-medium);
    box-shadow: 
        0 8px 32px var(--shadow-light),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    position: relative;
    overflow: hidden;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.post-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, 
        transparent, 
        var(--accent-color), 
        transparent);
    opacity: 0;
    transition: opacity var(--transition-medium);
}

.post-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 
        0 20px 60px var(--shadow-medium),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    border-color: var(--accent-color);
}

.post-card:hover::before {
    opacity: 1;
}

.post-card:hover .post-title {
    color: var(--accent-color);
}

/* Post Card Content */
.post-card-header {
    margin-bottom: var(--spacing-lg);
}

.post-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    line-height: 1.3;
    margin: 0 0 var(--spacing-md) 0;
    color: var(--text-color);
    transition: color var(--transition-medium);
    letter-spacing: -0.02em;
}

.post-date {
    display: inline-flex;
    align-items: center;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
    background: var(--surface-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.post-date::before {
    content: '📅';
    margin-right: var(--spacing-xs);
    font-size: 0.8em;
}

/* Post Tags */
.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: auto;
    padding-top: var(--spacing-md);
}

.post-card .tag {
    background: var(--surface-color);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.post-card .tag::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, var(--accent-color), transparent);
    opacity: 0.1;
    transition: left var(--transition-medium);
}

.post-card:hover .tag::before {
    left: 100%;
}

.post-card:hover .tag {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    transform: translateY(-2px);
}

/* Legacy Post Preview Support */
.post-preview {
    background: var(--surface-color);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    transition: all var(--transition-medium);
    box-shadow: 0 4px 16px var(--shadow-light);
}

.post-preview:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 32px var(--shadow-medium);
    border-color: var(--accent-color);
}

.post-preview h2 {
    margin-top: 0;
    margin-bottom: var(--spacing-md);
}

.post-preview h2 a {
    color: var(--text-color);
    text-decoration: none;
}

.post-preview h2 a:hover {
    color: var(--accent-color);
}

/* Responsive Design */
@media (max-width: 1200px) {
    .layout-container {
        grid-template-columns: 1fr;
        grid-template-areas: 
            "nav"
            "main";
    }
    
    .layout-container.has-toc {
        grid-template-columns: 1fr;
        grid-template-areas: 
            "nav"
            "main";
    }
    
    .sidebar,
    .toc-sidebar {
        display: none;
    }
    
    .hamburger-menu,
    .toc-toggle {
        display: flex !important;
    }
    
    .main-content {
        padding: var(--spacing-lg);
    }
    
    :root {
        --sidebar-width: 0;
        --toc-width: 0;
    }
}

@media (max-width: 768px) {
    .top-nav {
        padding: 0 var(--spacing-md);
    }
    
    .main-content {
        padding: var(--spacing-md);
    }
    
    .post-list {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .post-card {
        padding: var(--spacing-lg);
        min-height: 180px;
    }
    
    .post-title {
        font-size: var(--font-size-lg);
    }
    
    .index h1 {
        font-size: var(--font-size-3xl);
    }
    
    .index header {
        padding: var(--spacing-xl) 0;
        margin-bottom: var(--spacing-xl);
    }
    
    .post-preview {
        padding: var(--spacing-lg);
    }
    
    .scroll-to-top {
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
        width: 2.5rem;
        height: 2.5rem;
    }
    
    .post-meta {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .site-title {
        font-size: var(--font-size-md);
    }
    
    .main-content {
        padding: var(--spacing-sm);
    }
    
    h1 {
        font-size: var(--font-size-2xl);
    }
    
    h2 {
        font-size: var(--font-size-xl);
    }
    
    .scroll-to-top {
        bottom: var(--spacing-md);
        right: var(--spacing-md);
    }
}

/* Desktop TOC visibility */
@media (min-width: 1025px) {
    .layout-container.has-toc .toc-sidebar {
        display: block;
    }
}

/* Animation Keyframes */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

/* Content animations */
.main-content > * {
    animation: fadeInUp var(--transition-medium) ease-out;
}

.post-preview {
    animation: slideInRight var(--transition-medium) ease-out;
}

.post-preview:nth-child(even) {
    animation-delay: 0.1s;
}

.post-preview:nth-child(odd) {
    animation-delay: 0.05s;
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .scroll-to-top:hover {
        transform: none;
    }
    
    .post-preview:hover {
        transform: none;
    }
    
    img:hover {
        transform: none;
    }
}