/* CSS Variables for theming */
:root {
    --color-bg: #ffffff;
    --color-text: #1a1a2e;
    --color-text-muted: #555;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-border: #e5e7eb;
    --color-header-bg: #f8fafc;
    --color-footer-bg: #f1f5f9;
    --color-code-bg: #f3f4f6;
    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    --max-width: 48rem;
    --spacing: 1.5rem;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #0f172a;
        --color-text: #e2e8f0;
        --color-text-muted: #94a3b8;
        --color-primary: #60a5fa;
        --color-primary-hover: #93c5fd;
        --color-border: #334155;
        --color-header-bg: #1e293b;
        --color-footer-bg: #1e293b;
        --color-code-bg: #1e293b;
    }
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Base */
html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing);
}

/* Header */
.header {
    background-color: var(--color-header-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 0;
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
}

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

.nav-menu {
    display: flex;
    list-style: none;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.nav-link {
    color: var(--color-text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
}

.nav-social {
    display: flex;
    gap: 0.75rem;
}

.nav-social-link {
    color: var(--color-text-muted);
    transition: color 0.2s;
}

.nav-social-link:hover {
    color: var(--color-primary);
}

.nav-social-link svg {
    width: 20px;
    height: 20px;
}

/* Main content */
main {
    flex: 1;
    padding: 2rem 0;
}

/* Content */
.content {
    max-width: var(--max-width);
}

.content h1 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.content h2 {
    font-size: 1.5rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.content h3 {
    font-size: 1.25rem;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

.content p {
    margin-bottom: 1rem;
}

.content a {
    color: var(--color-primary);
    text-decoration: none;
}

.content a:hover {
    text-decoration: underline;
}

.content ul, .content ol {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

.content li {
    margin-bottom: 0.5rem;
}

.content img {
    max-width: 100%;
    height: auto;
    border-radius: 0.5rem;
    margin: 1rem 0;
}

.content pre {
    background-color: var(--color-code-bg);
    border-radius: 0.5rem;
    padding: 1rem;
    overflow-x: auto;
    margin-bottom: 1rem;
    font-family: var(--font-mono);
    font-size: 0.875rem;
}

.content code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background-color: var(--color-code-bg);
    padding: 0.125rem 0.25rem;
    border-radius: 0.25rem;
}

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

.content blockquote {
    border-left: 4px solid var(--color-primary);
    padding-left: 1rem;
    margin: 1rem 0;
    color: var(--color-text-muted);
}

/* Page list */
.page-list {
    list-style: none;
    padding: 0;
}

.page-list li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--color-border);
}

.page-list a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
}

.page-list a:hover {
    text-decoration: underline;
}

/* Footer */
.footer {
    background-color: var(--color-footer-bg);
    border-top: 1px solid var(--color-border);
    padding: 1.5rem 0;
    margin-top: auto;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 640px) {
    .nav {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav-menu {
        width: 100%;
        justify-content: flex-start;
    }

    .content h1 {
        font-size: 1.5rem;
    }
}