.documentation-shell {
    display: grid;
    grid-template-columns: minmax(280px, 320px) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
}

.documentation-sidebar {
    position: sticky;
    top: 24px;
    max-height: calc(100vh - 48px);
    overflow-y: auto;

    padding: 22px;

    border: 1px solid var(--line);
    border-radius: 18px;

    background: var(--surface);
}

.documentation-sidebar-header {
    display: grid;
    gap: 6px;

    margin-bottom: 24px;
}

.documentation-sidebar-header .eyebrow {
    margin: 0 0 4px;
}

.documentation-code {
    font-size: 0.95rem;
    letter-spacing: 0.04em;
}

.documentation-title {
    color: var(--muted);
    font-size: 0.92rem;
    line-height: 1.45;
}

.documentation-tree {
    display: grid;
    gap: 4px;
}

.documentation-section {
    border-bottom: 1px solid var(--line);
}

.documentation-section:last-child {
    border-bottom: 0;
}

.documentation-section summary {
    cursor: pointer;

    padding: 11px 2px;

    font-size: 0.95rem;
    font-weight: 700;
    line-height: 1.35;

    user-select: none;
}

.documentation-section summary:hover {
    color: var(--accent);
}

.documentation-chapter-list {
    display: grid;
    gap: 2px;

    padding: 0 0 10px;
}

.documentation-chapter-list a {
    display: grid;
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 4px;

    padding: 7px 8px;

    border-radius: 8px;

    color: var(--muted);
    text-decoration: none;

    font-size: 0.88rem;
    line-height: 1.4;
}

.documentation-chapter-list a:hover,
.documentation-chapter-list a:focus-visible {
    color: var(--text);
    background: rgb(49 91 74 / 8%);
    outline: none;
}

.documentation-chapter-list a[aria-current="page"] {
    color: var(--accent);
    background: rgb(49 91 74 / 10%);
    font-weight: 700;
}

.documentation-chapter-number {
    text-align: right;
    font-variant-numeric: tabular-nums;
}

.documentation-chapter-title {
    min-width: 0;
}

.documentation-content {
    min-width: 0;
}

.documentation-content-header {
    margin-bottom: 34px;
}

/*
 * Document + section context
 *
 * Example:
 * RAD-TECH-0001    INTRODUZIONE
 */
.documentation-context {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;

    margin-bottom: 34px;
}

.documentation-context-code {
    color: var(--accent);

    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.documentation-context-section {
    color: var(--accent);

    font-size: clamp(1.7rem, 2.8vw, 2.4rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.documentation-content-header .eyebrow {
    margin-bottom: 14px;
}

.documentation-content h1 {
    max-width: none;
    margin-top: 0;

    font-size: clamp(2.6rem, 4.2vw, 4.4rem);
    line-height: 1.02;
    letter-spacing: -0.04em;
}

.documentation-heading-number {
    color: var(--accent);
}

.documentation-article {
    max-width: 900px;
}

.documentation-article h2 {
    margin-top: 42px;
}

.documentation-article h3 {
    margin-top: 32px;
}

.documentation-article p,
.documentation-article li {
    line-height: 1.8;
}

.documentation-article ul,
.documentation-article ol {
    padding-left: 1.4rem;
}

.documentation-article table {
    width: 100%;
    margin: 28px 0;

    border-collapse: collapse;

    font-size: 0.95rem;
}

.documentation-article th,
.documentation-article td {
    padding: 10px 12px;

    border-bottom: 1px solid var(--line);

    text-align: left;
    vertical-align: top;
}

.documentation-article th {
    font-weight: 700;
}

.documentation-empty-state {
    max-width: 760px;

    padding: 28px;

    border: 1px solid var(--line);
    border-radius: 16px;

    background: var(--surface);
    color: var(--muted);
}

@media (max-width: 900px) {
    .documentation-shell {
        grid-template-columns: 1fr;
    }

    .documentation-sidebar {
        position: static;
        max-height: none;
    }

    .documentation-context {
        gap: 8px 18px;
    }
}