/*
 * Westree · Docs Layout (知识库三栏)
 *
 * v3.2 — sidebar 改为可折叠 accordion:
 *   - 每个 group 标题是可点击的 button，点击展开 / 折叠子项
 *   - 文档项 (.ar-docs-tab) AJAX 切换中心正文
 *   - 当前文档高亮 + 自动展开所在 group
 */

.ar-docs-single__layout {
    display: grid;
    grid-template-columns: 280px minmax(0, 1fr) 220px;
    gap: var(--space-8);
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--space-12) var(--container-padding);
    width: 100%;
}

/* ============================================================
 * Sidebar
 * ============================================================ */
.ar-docs-single__sidebar {
    position: sticky;
    top: 80px;
    align-self: start;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
    scrollbar-width: thin;
}

.ar-docs-single__sidebar-toggle {
    display: none;
    width: 100%;
    margin-bottom: var(--space-4);
    padding: var(--space-3);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    cursor: pointer;
    font-weight: var(--weight-medium);
}

.ar-docs-single__nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

/* ----- Group (collapsible) ----- */
.ar-docs-single__group {
    border-radius: var(--radius-md);
    overflow: hidden;
}

.ar-docs-single__group-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    width: 100%;
    padding: var(--space-2) var(--space-3);
    background: transparent;
    border: none;
    color: var(--color-text);
    font-size: var(--text-body-s);
    font-weight: var(--weight-semibold);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: color 200ms var(--ease-out), background 200ms var(--ease-out);
    -webkit-tap-highlight-color: transparent;
}

.ar-docs-single__group-toggle:hover {
    color: var(--color-primary);
    background: rgba(255, 255, 255, 0.04);
}

.ar-docs-single__group-toggle:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 1px;
}

.ar-docs-single__group-chevron {
    color: var(--color-text-tertiary);
    transition: transform 280ms var(--ease-spring);
    flex-shrink: 0;
}

.ar-docs-single__group.is-open .ar-docs-single__group-chevron {
    transform: rotate(180deg);
    color: var(--color-primary);
}

/* group body collapses smoothly via grid-template-rows */
.ar-docs-single__group-body {
    display: grid;
    grid-template-rows: 1fr;
    transition: grid-template-rows 320ms var(--ease-spring),
                margin 200ms var(--ease-out);
}

.ar-docs-single__group:not(.is-open) .ar-docs-single__group-body {
    grid-template-rows: 0fr;
    margin-top: 0;
}

.ar-docs-single__group-body > * {
    overflow: hidden;
    min-height: 0;
}

.ar-docs-single__group:not(.is-open) {
    border-bottom: 1px solid var(--color-border);
}

.ar-docs-single__docs,
.ar-docs-single__subcats {
    list-style: none;
    margin: 0;
    padding: var(--space-1) 0 var(--space-2);
}

.ar-docs-single__docs li,
.ar-docs-single__subcats li {
    margin: 0;
}

/* ----- Doc tabs (clickable to swap center) ----- */
.ar-docs-tab {
    display: flex;
    align-items: center;
    width: 100%;
    text-align: left;
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-body-s);
    color: var(--color-text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    background: transparent;
    border: 1px solid transparent;
    transition: background 180ms var(--ease-out),
                color 180ms var(--ease-out),
                border-color 180ms var(--ease-out),
                transform 180ms var(--ease-out);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    position: relative;
}

.ar-docs-tab::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 0;
    height: 18px;
    background: var(--color-primary);
    border-radius: 0 2px 2px 0;
    transform: translateY(-50%);
    transition: width 200ms var(--ease-out);
}

.ar-docs-tab:hover {
    background: var(--color-bg-elevated);
    color: var(--color-text);
}

.ar-docs-tab.is-active,
.ar-docs-tab.is-current,
.ar-docs-single__docs li.is-current > .ar-docs-tab {
    background: var(--color-primary-soft);
    color: var(--color-primary);
    border-color: rgba(112, 239, 93, 0.3);
    font-weight: var(--weight-medium);
}

.ar-docs-single__docs li.is-current > .ar-docs-tab::before {
    width: 3px;
}

/* ============================================================
 * Article (center column) with smooth swap animation
 * ============================================================ */
.ar-docs-single__article {
    min-width: 0;
    transition: opacity 320ms var(--ease-out),
                transform 320ms var(--ease-out);
}

.ar-docs-single__article.is-swapping {
    opacity: 0;
    transform: translateY(8px);
    pointer-events: none;
}

.ar-docs-single__header {
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--space-6);
    margin-bottom: var(--space-8);
}

.ar-docs-single__meta {
    display: flex;
    gap: var(--space-3);
    align-items: center;
    margin-bottom: var(--space-4);
    font-size: var(--text-body-s);
    color: var(--color-text-secondary);
}

.ar-docs-single__cat {
    background: var(--color-primary-soft);
    color: var(--color-primary);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-weight: var(--weight-medium);
}

.ar-docs-single__title {
    font-size: var(--text-h1);
    margin: 0;
}

.ar-docs-single__content {
    font-size: var(--text-body-l);
    line-height: var(--leading-relaxed);
    color: var(--color-text-body);
}

.ar-docs-single__content h2 {
    margin-top: var(--space-12);
    margin-bottom: var(--space-4);
    font-size: var(--text-h2);
    padding-bottom: var(--space-2);
    border-bottom: 1px solid var(--color-border);
}

.ar-docs-single__content h3 {
    margin-top: var(--space-8);
    margin-bottom: var(--space-3);
    font-size: var(--text-h3);
}

.ar-docs-single__content p { margin-bottom: var(--space-4); }

.ar-docs-single__content pre {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    overflow-x: auto;
    margin: var(--space-4) 0;
    font-family: var(--font-mono);
    font-size: var(--text-body-s);
}

.ar-docs-single__content code {
    background: var(--color-bg-elevated);
    padding: 2px 6px;
    border-radius: var(--radius-xs);
    font-family: var(--font-mono);
    font-size: 0.92em;
}

.ar-docs-single__content pre code { background: transparent; padding: 0; }

.ar-docs-single__content ul, .ar-docs-single__content ol { margin: 0 0 var(--space-4) var(--space-6); }
.ar-docs-single__content li { margin-bottom: var(--space-2); }

.ar-docs-single__footer {
    margin-top: var(--space-12);
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    align-items: flex-start;
}

.ar-docs-single__help {
    font-size: var(--text-body-s);
    color: var(--color-text-secondary);
    margin: 0;
}

/* ============================================================
 * TOC (right column)
 * ============================================================ */
.ar-docs-single__toc {
    position: sticky;
    top: 80px;
    align-self: start;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
}

.ar-docs-single__toc-title {
    font-size: var(--text-body-s);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    color: var(--color-text-tertiary);
    margin: 0 0 var(--space-3);
}

.ar-docs-single__toc-list {
    font-size: var(--text-body-s);
    border-left: 1px solid var(--color-border);
}

.ar-docs-single__toc-list a {
    display: block;
    padding: var(--space-1) var(--space-3);
    color: var(--color-text-secondary);
    text-decoration: none;
    border-left: 2px solid transparent;
    margin-left: -1px;
    transition: all var(--dur-fast) var(--ease-out);
}

.ar-docs-single__toc-list a:hover { color: var(--color-primary); }
.ar-docs-single__toc-list a.is-active {
    color: var(--color-primary);
    border-left-color: var(--color-primary);
}
.ar-docs-single__toc-list .ar-toc-h3 {
    padding-left: var(--space-6);
    font-size: var(--text-caption);
}

/* ============================================================
 * Docs archive (/docs)
 * ============================================================ */
.ar-docs-archive__layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--space-8);
    margin-top: var(--space-12);
}
.ar-docs-archive__nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}
.ar-docs-archive__group {
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--space-4);
}
.ar-docs-archive__group:last-child { border-bottom: none; }
.ar-docs-archive__group-title {
    font-size: var(--text-body-s);
    font-weight: var(--weight-semibold);
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    margin: 0 0 var(--space-3);
}
.ar-docs-archive__sublist {
    list-style: none;
    margin: 0;
    padding: 0;
}
.ar-docs-archive__sublist li { margin-bottom: var(--space-1); }
.ar-docs-archive__sublist a {
    display: block;
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-body-s);
    color: var(--color-text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--dur-fast) var(--ease-out);
}
.ar-docs-archive__sublist a:hover {
    color: var(--color-primary);
    background: var(--color-bg-elevated);
}
.ar-docs-archive__recent h2 {
    font-size: var(--text-h3);
    margin: 0 0 var(--space-4);
}
.ar-docs-archive__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}
.ar-docs-archive__list li {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--dur-fast) var(--ease-out);
}
.ar-docs-archive__list li:hover { border-color: var(--color-primary); }
.ar-docs-archive__list a {
    display: block;
    padding: var(--space-4);
    text-decoration: none;
    color: var(--color-text);
}
.ar-docs-archive__list h3 {
    font-size: var(--text-body-l);
    font-weight: var(--weight-semibold);
    margin: 0 0 var(--space-2);
}
.ar-docs-archive__cat {
    font-size: var(--text-caption);
    color: var(--color-primary);
    background: var(--color-primary-soft);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    margin-right: var(--space-2);
}
.ar-docs-archive__list p {
    margin: var(--space-2) 0 0;
    font-size: var(--text-body-s);
    color: var(--color-text-secondary);
}
.ar-docs-archive__search { margin-top: var(--space-8); }
.ar-docs-archive__search-form {
    display: flex;
    gap: var(--space-3);
    max-width: 560px;
    margin: 0 auto;
}
.ar-docs-archive__search-form input {
    flex: 1;
    height: 42px;
    padding: 0 var(--space-4);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: var(--text-body-s);
}
.ar-docs-archive__search-form input:focus {
    outline: none;
    border-color: var(--color-primary);
}

@media (max-width: 1024px) {
    .ar-docs-single__layout { grid-template-columns: 240px minmax(0, 1fr); }
    .ar-docs-single__toc { display: none; }
    .ar-docs-archive__layout { grid-template-columns: 1fr; }
}

/* ============================================================
 * Docs archive (/docs) 门户正文列（与单篇同版式）
 * ============================================================ */
.ar-docs-archive__content { min-width: 0; }
.ar-docs-archive__content .ar-docs-archive__search-form { margin: 0; }
.ar-docs-archive__section h2 { scroll-margin-top: 96px; }

@media (max-width: 768px) {
    .ar-docs-single__layout { grid-template-columns: 1fr; }
    .ar-docs-single__sidebar {
        position: fixed;
        inset: 64px 0 0;
        background: var(--color-bg);
        z-index: var(--z-modal);
        padding: var(--space-6);
        border-right: 1px solid var(--color-border);
        max-height: calc(100vh - 64px);
        transform: translateX(-100%);
        transition: transform var(--dur-base) var(--ease-out);
    }
    .ar-docs-single__sidebar.is-open { transform: translateX(0); }
    .ar-docs-single__sidebar-toggle { display: block; }
}