/* Modern Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #ffffff;
    --bg-secondary: #f9fafb;
    --border-color: #e5e7eb;
    --code-bg: #f3f4f6;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 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);
}

@media (prefers-color-scheme: dark) {
    :root {
        --primary-color: #3b82f6;
        --text-color: #f9fafb;
        --text-light: #d1d5db;
        --bg-color: #111827;
        --bg-secondary: #1f2937;
        --border-color: #374151;
        --code-bg: #1f2937;
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    line-height: 1.75;
    color: var(--text-color);
    background-color: var(--bg-color);
    padding: 20px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Header */
header {
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    padding: 30px 20px;
    margin: -20px -20px 60px -20px;
    box-shadow: var(--shadow);
}

header nav {
    max-width: 800px;
    margin: 0 auto;
}

header h1 {
    font-size: 2.5em;
    font-weight: 700;
    letter-spacing: -0.025em;
}

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

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

/* Main content */
main {
    max-width: 800px;
    margin: 0 auto;
    min-height: 70vh;
}

/* Posts */
.posts {
    margin-top: 30px;
}

.post-summary {
    margin-bottom: 50px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--border-color);
    transition: transform 0.2s ease;
}

.post-summary:hover {
    transform: translateX(4px);
}

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

.post-summary h3 {
    font-size: 1.75em;
    margin-bottom: 12px;
    font-weight: 600;
    line-height: 1.3;
}

.post-summary h3 a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

.post-summary h3 a:hover {
    color: var(--primary-color);
}

.post-summary time {
    color: var(--text-light);
    font-size: 0.95em;
    font-weight: 500;
    display: block;
    margin-bottom: 12px;
}

.post-summary p {
    margin-top: 12px;
    color: var(--text-light);
    line-height: 1.7;
}

/* Single post */
.post header {
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
}

.post h2 {
    font-size: 2.5em;
    margin-bottom: 16px;
    font-weight: 700;
    letter-spacing: -0.025em;
    line-height: 1.2;
}

.post time {
    color: var(--text-light);
    font-size: 1em;
    font-weight: 500;
    display: block;
}

.post .content {
    margin-top: 40px;
    line-height: 1.8;
    font-size: 1.1em;
}

.post .content h1 {
    font-size: 2em;
    margin-top: 40px;
    margin-bottom: 20px;
    font-weight: 700;
    letter-spacing: -0.025em;
}

.post .content h2 {
    font-size: 1.75em;
    margin-top: 36px;
    margin-bottom: 18px;
    font-weight: 600;
}

.post .content h3 {
    font-size: 1.5em;
    margin-top: 32px;
    margin-bottom: 16px;
    font-weight: 600;
}

.post .content h4 {
    font-size: 1.25em;
    margin-top: 28px;
    margin-bottom: 14px;
    font-weight: 600;
}

.post .content p {
    margin-bottom: 20px;
}

.post .content ul,
.post .content ol {
    margin-left: 30px;
    margin-bottom: 20px;
}

.post .content li {
    margin-bottom: 8px;
}

.post .content strong {
    font-weight: 600;
}

.post .content em {
    font-style: italic;
}

.post .content code {
    background-color: var(--code-bg);
    padding: 3px 8px;
    border-radius: 4px;
    font-family: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;
    font-size: 0.9em;
    color: var(--primary-color);
}

.post .content pre {
    background-color: var(--code-bg);
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.post .content pre code {
    background-color: transparent;
    padding: 0;
    color: var(--text-color);
    font-size: 0.95em;
}

.post .content blockquote {
    border-left: 4px solid var(--primary-color);
    margin-left: 0;
    margin-bottom: 20px;
    color: var(--text-light);
    font-style: italic;
    background-color: var(--bg-secondary);
    padding: 20px 24px;
    border-radius: 4px;
}

.post .content a {
    color: var(--primary-color);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
    transition: opacity 0.2s ease;
}

.post .content a:hover {
    opacity: 0.8;
}

.post .content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 24px 0;
    box-shadow: var(--shadow-lg);
}

.post .content hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 40px 0;
}

/* Footer */
footer {
    margin-top: 80px;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-light);
    font-size: 0.95em;
}

/* Home page */
.home h2 {
    font-size: 2em;
    margin-bottom: 40px;
    font-weight: 700;
    color: var(--text-color);
}

/* Responsive */
@media (max-width: 768px) {
    body {
        padding: 10px;
        font-size: 16px;
    }
    
    header {
        padding: 20px 10px;
        margin: -10px -10px 40px -10px;
    }
    
    header h1 {
        font-size: 1.75em;
    }
    
    .post h2 {
        font-size: 1.75em;
    }
    
    .post .content {
        font-size: 1em;
    }
    
    .post .content h1 {
        font-size: 1.75em;
    }
    
    .post .content h2 {
        font-size: 1.5em;
    }
    
    .post .content h3 {
        font-size: 1.25em;
    }
}