/* Reset & Base */
:root {
    --bg-color: #ffffff;
    --text-color: #1a1a1a;
    --sidebar-bg: #f9f9f9;
    --border-color: #e5e5e5;
    --primary-color: #10b981; /* Emerald 500 */
    --primary-hover: #059669;
    --code-bg: #f3f4f6;
    --header-height: 60px;
    --sidebar-width: 280px;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #111827;
        --text-color: #e5e7eb;
        --sidebar-bg: #1f2937;
        --border-color: #374151;
        --primary-color: #34d399;
        --primary-hover: #10b981;
        --code-bg: #1f2937;
    }
}

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

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

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

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

/* Header */
header {
    height: var(--header-height);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 2rem;
    position: sticky;
    top: 0;
    background-color: var(--bg-color);
    z-index: 10;
}

.logo {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-color);
}

.back-to-site {
    margin-left: 1rem;
    font-size: 0.9rem;
    opacity: 0.9;
}

.lang-switch {
    margin-left: auto;
    font-size: 0.9rem;
    opacity: 0.85;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.5rem;
    cursor: pointer;
    margin-right: 1rem;
}

/* Layout */
.container {
    display: flex;
    flex: 1;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* Sidebar */
aside {
    width: var(--sidebar-width);
    border-right: 1px solid var(--border-color);
    background-color: var(--sidebar-bg);
    padding: 2rem;
    position: sticky;
    top: var(--header-height);
    height: calc(100vh - var(--header-height));
    overflow-y: auto;
}

aside h3 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-color);
    opacity: 0.7;
    margin-bottom: 1rem;
    margin-top: 2rem;
}

aside h3:first-child {
    margin-top: 0;
}

aside ul {
    list-style: none;
}

aside li {
    margin-bottom: 0.5rem;
}

aside ul ul {
    margin-top: 0.25rem;
    margin-bottom: 0.5rem;
    padding-left: 1rem;
}

aside a {
    color: var(--text-color);
    display: block;
    padding: 0.5rem 0;
    opacity: 0.8;
}

aside a:hover, aside a.active {
    color: var(--primary-color);
    opacity: 1;
}

/* Main Content */
main {
    flex: 1;
    padding: 3rem 4rem;
    max-width: 900px;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

h2 {
    font-size: 1.75rem;
    margin-top: 3rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

h3 {
    font-size: 1.25rem;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

p {
    margin-bottom: 1.25rem;
}

code {
    font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
    background-color: var(--code-bg);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-size: 0.9em;
}

pre {
    background-color: var(--code-bg);
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 1.5rem;
}

pre code {
    background-color: transparent;
    padding: 0;
    font-size: 0.9rem;
}

blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 1rem;
    margin-bottom: 1.5rem;
    font-style: italic;
    color: var(--text-color);
    opacity: 0.8;
}

/* Responsive */
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    aside {
        position: fixed;
        left: -100%;
        top: var(--header-height);
        bottom: 0;
        width: 80%;
        max-width: 300px;
        z-index: 20;
        transition: left 0.3s ease;
        border-right: 1px solid var(--border-color);
        box-shadow: 4px 0 10px rgba(0,0,0,0.1);
    }

    aside.open {
        left: 0;
    }

    main {
        padding: 2rem;
    }
}