html {
    min-height: 100%;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: Arial, sans-serif;
    color: #202124;
    background: #fff;
}

.doc-shell {
    display: flex;
    min-height: 100vh;
}

.doc-sidebar {
    width: 320px;
    flex-shrink: 0;
    box-sizing: border-box;
    padding: 20px 16px;
    background: #f8f9fb;
    border-right: 1px solid #ddd;
    position: sticky;
    top: 0;
    align-self: flex-start;
    min-height: 100vh;
}

.doc-sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 18px;
    color: #1f2937;
    text-decoration: none;
    font-size: 18px;
    font-weight: bold;
}

.doc-sidebar-header img {
    width: 28px;
    height: 28px;
    flex-shrink: 0;
}

.doc-nav {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.doc-nav-link,
.doc-nav-section {
    display: block;
    padding: 6px 0;
}

.doc-nav-link {
    color: #2b5fd9;
    text-decoration: none;
}

.doc-nav-link:hover {
    text-decoration: underline;
}

.doc-nav-link.active {
    color: #0b47c1;
    font-weight: 600;
}

.doc-nav-section {
    margin-top: 10px;
    color: #333;
    font-weight: 600;
}

.doc-nav-section.active {
    color: #0b47c1;
}

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

.doc-article {
    max-width: 1000px;
    box-sizing: border-box;
    padding: 24px 32px;
    line-height: 1.55;
}

h1, h2, h3 {
    color: #1f2937;
}

figure {
    margin: 24px 0;
}

figcaption {
    color: #5f6368;
    font-size: 0.95rem;
    margin-top: 8px;
}

img {
    max-width: 100%;
    height: auto;
    border: 1px solid #d0d7de;
}

.note, .warning {
    padding: 12px 14px;
    margin: 18px 0;
}

.note {
    background: #f3f7ff;
    border-left: 4px solid #2b5fd9;
}

.warning {
    background: #fff6e5;
    border-left: 4px solid #d28a00;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 18px 0 24px 0;
}

th, td {
    border: 1px solid #d0d7de;
    padding: 10px;
    text-align: left;
    vertical-align: top;
}

th {
    background: #f6f8fa;
}

code {
    background: #f6f8fa;
    padding: 1px 4px;
    border-radius: 4px;
}

.doc-image {
    width: 50%;
    max-width: 100%;
    height: auto;
    cursor: zoom-in;
}

.doc-image-placeholder {
    display: grid;
    place-items: center;
    min-height: 240px;
    padding: 24px;
    box-sizing: border-box;
    border: 2px dashed #9aa0a6;
    background: #f6f8fa;
    color: #5f6368;
    font-weight: 600;
    text-align: center;
}

@media (max-width: 900px) {
    .doc-shell {
        flex-direction: column;
    }

    .doc-sidebar {
        width: 100%;
        min-height: 0;
        position: static;
        border-right: none;
        border-bottom: 1px solid #ddd;
    }

    .doc-article {
        padding: 20px 18px 28px;
    }

    .doc-image {
        width: 100%;
    }
}