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

body {
    background: #ffffff;
    font-family: 'Poppins';
    color: #111111;
    line-height: 1.7;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}


.header {
    border-bottom: 2px solid #111;
    padding-bottom: 1.5rem;
    margin-bottom: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    flex-wrap: wrap;
    gap: 1rem;
}

.header h1 {
    font-size: 1.8rem;
    font-weight: 600;
    letter-spacing: -0.5px;
}

.header p {
    color: #333;
    margin-top: 0.5rem;
}


.lang-selector {
    display: flex;
    gap: 0.5rem;
    background: #f5f5f5;
    padding: 0.3rem;
    border-radius: 8px;
}

.lang-btn {
    background: none;
    border: 1px solid #ccc;
    padding: 0.3rem 1rem;
    cursor: pointer;
    font-family: monospace;
    font-size: 0.8rem;
    transition: all 0.2s;
    border-radius: 6px;
}

.lang-btn.active {
    background: #111;
    color: white;
    border-color: #111;
}

.lang-btn:hover:not(.active) {
    background: #e0e0e0;
}


.layout {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.sidebar {
    width: 260px;
    position: sticky;
    top: 1rem;
    align-self: start;
}

.toc {
    border-left: 3px solid #111;
    padding-left: 1.2rem;
}

.toc h3 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1rem;
    font-weight: 600;
}

.toc ul {
    list-style: none;
}

.toc li {
    margin-bottom: 0.6rem;
}

.toc a {
    text-decoration: none;
    color: #111;
    font-size: 0.85rem;
    border-bottom: 1px solid transparent;
    transition: border 0.1s;
    cursor: pointer;
}

.toc a:hover {
    border-bottom-color: #111;
}

.content {
    flex: 1;
    min-width: 0;
}

.section {
    margin-bottom: 3rem;
    scroll-margin-top: 1rem;
}

.section h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    padding-bottom: 0.3rem;
    border-bottom: 1px solid #ccc;
}

.section h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 1.5rem 0 0.8rem 0;
}

.section h4 {
    font-size: 1rem;
    font-weight: 600;
    margin: 1rem 0 0.5rem 0;
    color: #1a1a1a;
}

pre {
    background: #f5f5f5;
    border: 1px solid #ddd;
    padding: 1rem;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.8rem;
    margin: 1rem 0;
    line-height: 1.5;
}

code {
    font-family: 'Courier New', monospace;
    background: #f0f0f0;
    padding: 0.2rem 0.3rem;
    font-size: 0.85rem;
}

.comment-block {
    background: #fafafa;
    border-left: 3px solid #888;
    padding: 0.8rem 1rem;
    margin: 1rem 0;
    font-size: 0.85rem;
    color: #2c2c2c;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    font-size: 0.85rem;
}

th,
td {
    border: 1px solid #ccc;
    padding: 0.5rem;
    text-align: left;
    vertical-align: top;
}

th {
    background: #f0f0f0;
    font-weight: 600;
}

hr {
    margin: 2rem 0;
    border: none;
    border-top: 1px solid #ddd;
}

footer {
    margin-top: 3rem;
    padding-top: 1rem;
    border-top: 1px solid #ddd;
    font-size: 0.75rem;
    color: #555;
    text-align: center;
}

[data-en] {
    transition: opacity 0.1s;
}

@media (max-width: 800px) {
    .layout {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        position: static;
        border-bottom: 1px solid #ddd;
        padding-bottom: 1rem;
        margin-bottom: 1rem;
    }

    .toc {
        border-left: none;
        padding-left: 0;
    }

    .toc ul {
        display: flex;
        flex-wrap: wrap;
        gap: 1rem;
    }

    .header {
        flex-direction: column;
        align-items: flex-start;
    }
}