/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-secondary: #64748b;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-background: #ffffff;
    --color-background-light: #f8fafc;
    --color-border: #e2e8f0;
    --color-accent: #f59e0b;
    
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
    
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    --border-radius: 0.5rem;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

html {
    font-size: 16px;
    line-height: 1.6;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background-color: var(--color-background);
    line-height: 1.7;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-primary-dark);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--color-primary);
    color: white;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s ease;
    border: 2px solid var(--color-primary);
}

.btn:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: white;
}

/* Header */
.site-header {
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.9);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title a {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-text);
    text-decoration: none;
}

.site-nav {
    display: flex;
    gap: var(--spacing-lg);
}

.site-nav a {
    font-weight: 500;
    color: var(--color-text-light);
    transition: color 0.2s ease;
}

.site-nav a:hover {
    color: var(--color-primary);
}

/* Main Content */
.site-main {
    min-height: calc(100vh - 200px);
    padding: var(--spacing-2xl) 0;
}

/* Hero Section */
.hero {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(135deg, var(--color-background-light) 0%, var(--color-background) 100%);
    border-radius: var(--border-radius);
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.25rem;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* Post Cards */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.post-card {
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
    position: relative;
}

.post-card-draft {
    border-color: #fbbf24;
    background-color: #fefbf3;
}

.draft-indicator {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background-color: #fbbf24;
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: calc(var(--border-radius) / 2);
    font-size: 0.75rem;
    font-weight: 600;
}

.post-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.post-card-title {
    margin-bottom: var(--spacing-sm);
}

.post-card-title a {
    color: var(--color-text);
    text-decoration: none;
}

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

.post-card-meta {
    display: flex;
    gap: var(--spacing-md);
    color: var(--color-text-light);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
}

.post-card-excerpt {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.post-card-tags {
    margin-bottom: var(--spacing-md);
}

.post-card-link {
    font-weight: 500;
    color: var(--color-primary);
}

/* Tags */
.tag {
    display: inline-block;
    background-color: var(--color-background-light);
    color: var(--color-text-light);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: calc(var(--border-radius) / 2);
    font-size: 0.75rem;
    font-weight: 500;
    margin-right: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
}

/* Post Layout */
.post {
    max-width: 800px;
    margin: 0 auto;
}

/* Draft Banner */
.draft-banner {
    background-color: #fef3cd;
    border: 1px solid #fbbf24;
    color: #92400e;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    font-weight: 600;
}

.post-header {
    margin-bottom: var(--spacing-2xl);
    text-align: center;
}

.post-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
}

.post-meta {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.post-description {
    font-size: 1.125rem;
    color: var(--color-text-light);
    font-style: italic;
}

.post-content {
    font-size: 1.125rem;
    line-height: 1.8;
}

.post-content h2 {
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-lg);
}

.post-content h3 {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.post-content ul, .post-content ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xl);
}

.post-content li {
    margin-bottom: var(--spacing-sm);
}

.post-content blockquote {
    border-left: 4px solid var(--color-primary);
    padding-left: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    font-style: italic;
    color: var(--color-text-light);
}

.post-content code {
    background-color: var(--color-background-light);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: calc(var(--border-radius) / 2);
    font-family: var(--font-mono);
    font-size: 0.9em;
}

.post-content pre {
    background-color: var(--color-background-light);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin: var(--spacing-lg) 0;
}

.post-content pre code {
    background: none;
    padding: 0;
}

/* Post Navigation */
.post-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
}

.post-nav-prev,
.post-nav-next {
    display: block;
}

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

.post-nav a {
    display: block;
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    text-decoration: none;
    transition: all 0.2s ease;
}

.post-nav a:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.nav-label {
    display: block;
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
}

.nav-title {
    font-weight: 600;
    color: var(--color-text);
}

/* Archive */
.posts-archive {
    max-width: 800px;
    margin: 0 auto;
}

.archive-post {
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--color-border);
    position: relative;
}

.archive-post-draft {
    background-color: #fefbf3;
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    border: 1px solid #fbbf24;
}

.draft-indicator-archive {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background-color: #fbbf24;
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: calc(var(--border-radius) / 2);
    font-size: 0.75rem;
    font-weight: 600;
}

.archive-post:last-child {
    border-bottom: none;
}

.archive-post-title {
    margin-bottom: var(--spacing-sm);
}

.archive-post-title a {
    color: var(--color-text);
    text-decoration: none;
}

.archive-post-title a:hover {
    color: var(--color-primary);
}

.archive-post-meta {
    display: flex;
    gap: var(--spacing-md);
    color: var(--color-text-light);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
}

.archive-post-excerpt {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.archive-post-tags {
    margin-bottom: var(--spacing-md);
}

/* Page Layout */
.page {
    max-width: 800px;
    margin: 0 auto;
}

.page-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.page-title {
    margin-bottom: var(--spacing-md);
}

.page-description {
    font-size: 1.125rem;
    color: var(--color-text-light);
}

.page-content {
    font-size: 1.125rem;
    line-height: 1.8;
}

/* About Preview */
.about-preview {
    background-color: var(--color-background-light);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius);
    text-align: center;
    margin-top: var(--spacing-2xl);
}

.about-preview h2 {
    margin-bottom: var(--spacing-lg);
}

.about-preview p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* View All */
.view-all {
    text-align: center;
    margin-top: var(--spacing-xl);
}

/* Footer */
.site-footer {
    background-color: var(--color-background-light);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) 0;
    text-align: center;
    color: var(--color-text-light);
}

.site-footer p {
    margin-bottom: var(--spacing-sm);
}

.site-footer a {
    color: var(--color-primary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .header-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .site-nav {
        gap: var(--spacing-md);
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero p {
        font-size: 1.125rem;
    }
    
    .posts-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .post-card {
        padding: var(--spacing-lg);
    }
    
    .post-title {
        font-size: 2rem;
    }
    
    .post-meta {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .post-nav {
        grid-template-columns: 1fr;
    }
    
    .post-nav-next {
        text-align: left;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: var(--spacing-lg) 0;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .about-preview {
        padding: var(--spacing-lg);
    }
}