/* Docs-specific styles — learn.brrain.io */

/* ===== Docs Shell (3-column layout) ===== */

.docs-shell {
    max-width: var(--max-width-wide);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.docs-columns {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    min-height: calc(100vh - 200px);
}

@media (min-width: 768px) {
    .docs-columns {
        grid-template-columns: 240px 1fr;
    }
}

@media (min-width: 1024px) {
    .docs-columns {
        grid-template-columns: 240px 1fr 200px;
    }
}

/* ===== Sidebar ===== */

.docs-sidebar {
    display: none;
    position: sticky;
    top: 80px;
    height: calc(100vh - 100px);
    overflow-y: auto;
    padding: var(--space-md) 0;
    border-right: 1px solid var(--color-border);
}

.docs-sidebar.is-open {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100vh;
    background: var(--color-bg);
    z-index: var(--z-overlay);
    padding: var(--space-xl) var(--space-md) var(--space-md);
    border-right: 1px solid var(--color-border);
}

@media (min-width: 768px) {
    .docs-sidebar {
        display: block;
    }

    .docs-sidebar.is-open {
        position: sticky;
        width: auto;
        padding: var(--space-md) 0;
    }
}

.docs-nav__section {
    margin-bottom: var(--space-lg);
}

.docs-nav__heading {
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-sm);
    padding: 0 var(--space-sm);
}

.docs-nav__list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.docs-nav__link {
    display: block;
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background var(--transition-fast);
}

.docs-nav__link:hover {
    color: var(--color-text-primary);
    background: var(--color-surface-1);
}

.docs-nav__link--active {
    color: var(--color-accent-cyan);
    background: var(--color-accent-cyan-muted);
}

/* ===== Sidebar toggle (mobile) ===== */

.docs-sidebar-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--color-surface-1);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    margin-bottom: var(--space-md);
}

@media (min-width: 768px) {
    .docs-sidebar-toggle {
        display: none;
    }
}

/* ===== TOC (right column) ===== */

.docs-toc {
    display: none;
    position: sticky;
    top: 80px;
    height: calc(100vh - 100px);
    overflow-y: auto;
    padding: var(--space-md) 0;
}

@media (min-width: 1024px) {
    .docs-toc {
        display: block;
    }
}

.docs-toc__heading {
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-sm);
}

.docs-toc__list {
    list-style: none;
    padding: 0;
    margin: 0;
    border-left: 1px solid var(--color-border);
}

.docs-toc__link {
    display: block;
    padding: var(--space-xs) var(--space-md);
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    text-decoration: none;
    transition: color var(--transition-fast), border-color var(--transition-fast);
    border-left: 2px solid transparent;
    margin-left: -1px;
}

.docs-toc__link:hover {
    color: var(--color-text-secondary);
}

.docs-toc__link--active {
    color: var(--color-accent-cyan);
    border-left-color: var(--color-accent-cyan);
}

.docs-toc__link--h3 {
    padding-left: calc(var(--space-md) + var(--space-sm));
}

/* ===== Search bar ===== */

.docs-search-bar {
    margin-bottom: var(--space-md);
}

.docs-search-trigger {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    width: 100%;
    max-width: 400px;
    padding: var(--space-sm) var(--space-md);
    background: var(--color-surface-1);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-tertiary);
    font-family: var(--font-ui);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: border-color var(--transition-fast);
}

.docs-search-trigger:hover {
    border-color: var(--color-surface-5);
}

.docs-search-trigger__text {
    flex: 1;
    text-align: left;
}

.docs-search-trigger__kbd {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    padding: 2px 6px;
    font-family: var(--font-ui);
    font-size: var(--text-xs);
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-tertiary);
}

/* ===== Breadcrumbs ===== */

.docs-breadcrumbs {
    margin-bottom: var(--space-md);
}

.docs-breadcrumbs__list {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    list-style: none;
    padding: 0;
    margin: 0;
}

.docs-breadcrumbs__item::before {
    content: "/";
    margin-right: var(--space-sm);
    color: var(--color-text-tertiary);
}

.docs-breadcrumbs__item:first-child::before {
    content: none;
}

.docs-breadcrumbs__link {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.docs-breadcrumbs__link:hover {
    color: var(--color-accent-cyan);
}

.docs-breadcrumbs__item--current {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

/* ===== Docs page content ===== */

.docs-main {
    min-width: 0;
    padding: var(--space-md) 0;
}

.docs-page__header {
    margin-bottom: var(--space-xl);
}

.docs-page__title {
    font-size: var(--text-3xl);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-sm);
}

.docs-page__description {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.docs-page__body h2 {
    font-size: var(--text-2xl);
    font-weight: 600;
    margin-top: var(--space-xl);
    margin-bottom: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

.docs-page__body h3 {
    font-size: var(--text-xl);
    font-weight: 600;
    margin-top: var(--space-lg);
    margin-bottom: var(--space-sm);
}

.docs-page__body p {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-md);
}

.docs-page__body ul,
.docs-page__body ol {
    color: var(--color-text-secondary);
    padding-left: var(--space-lg);
    margin-bottom: var(--space-md);
}

.docs-page__body li {
    margin-bottom: var(--space-xs);
}

.docs-page__body a {
    color: var(--color-accent-cyan);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition-fast);
}

.docs-page__body a:hover {
    border-bottom-color: var(--color-accent-cyan);
}

/* ===== Page footer ===== */

.docs-page__footer {
    margin-top: var(--space-2xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.docs-page__edit-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.docs-page__edit-link:hover {
    color: var(--color-accent-cyan);
}

.docs-page__nav {
    display: flex;
    justify-content: space-between;
    margin-top: var(--space-lg);
    gap: var(--space-md);
}

.docs-page__nav-link {
    display: flex;
    flex-direction: column;
    padding: var(--space-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: border-color var(--transition-fast);
    flex: 1;
}

.docs-page__nav-link:hover {
    border-color: var(--color-accent-cyan);
}

.docs-page__nav-link--next {
    text-align: right;
}

.docs-page__nav-label {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.docs-page__nav-title {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-accent-cyan);
}

/* ===== Code tabs ===== */

.code-tabs {
    margin: var(--space-lg) 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.code-tabs__header {
    display: flex;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface-1);
    overflow-x: auto;
}

.code-tabs__tab {
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-ui);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-tertiary);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    white-space: nowrap;
    transition: color var(--transition-fast), border-color var(--transition-fast);
}

.code-tabs__tab:hover {
    color: var(--color-text-secondary);
}

.code-tabs__tab[aria-selected="true"] {
    color: var(--color-accent-cyan);
    border-bottom-color: var(--color-accent-cyan);
}

.code-tabs__panel {
    position: relative;
}

.code-tabs__panel[hidden] {
    display: none;
}

.code-tabs__panel pre {
    margin: 0;
    border: none;
    border-radius: 0;
}

.code-tabs__actions {
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
    z-index: 1;
}

.code-tabs__copy {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-tertiary);
    cursor: pointer;
    transition: color var(--transition-fast), background var(--transition-fast);
}

.code-tabs__copy:hover {
    color: var(--color-text-primary);
    background: var(--color-surface-3);
}

.code-tabs__copy.is-copied {
    color: var(--color-success);
}

/* ===== Changelog ===== */

.changelog {
    max-width: var(--max-width-narrow);
    margin: 0 auto;
    padding: var(--space-xl) 0;
}

.changelog__header {
    margin-bottom: var(--space-xl);
}

.changelog__title {
    font-size: var(--text-3xl);
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.changelog__description {
    color: var(--color-text-secondary);
    font-size: var(--text-lg);
}

.changelog__filter {
    margin-bottom: var(--space-lg);
}

.changelog__select {
    max-width: 200px;
}

.changelog__list {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.changelog__release {
    padding: var(--space-lg);
}

.changelog__release[hidden] {
    display: none;
}

.changelog__release-header {
    display: flex;
    align-items: baseline;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.changelog__version {
    font-size: var(--text-xl);
    font-weight: 600;
}

.changelog__date {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
}

.changelog__section {
    margin-bottom: var(--space-md);
}

.changelog__section-title {
    margin-bottom: var(--space-sm);
}

.changelog__items {
    list-style: none;
    padding: 0;
    margin: 0;
}

.changelog__item {
    padding: var(--space-xs) 0;
    padding-left: var(--space-md);
    position: relative;
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.changelog__item::before {
    content: "";
    position: absolute;
    left: 0;
    top: 12px;
    width: 4px;
    height: 4px;
    background: var(--color-text-tertiary);
    border-radius: var(--radius-full);
}

/* ===== Search overlay ===== */

.docs-search-overlay {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 15vh;
}

.docs-search-overlay[hidden] {
    display: none;
}

.docs-search-overlay__backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
}

.docs-search-overlay__panel {
    position: relative;
    width: 100%;
    max-width: 600px;
    margin: 0 var(--space-md);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.docs-search-overlay__input-wrap {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
}

.docs-search-overlay__icon {
    flex-shrink: 0;
    color: var(--color-text-tertiary);
}

.docs-search-overlay__input {
    flex: 1;
    background: none;
    border: none;
    color: var(--color-text-primary);
    font-family: var(--font-ui);
    font-size: var(--text-base);
    outline: none;
}

.docs-search-overlay__input::placeholder {
    color: var(--color-text-tertiary);
}

.docs-search-overlay__esc {
    padding: 2px 6px;
    font-family: var(--font-ui);
    font-size: var(--text-xs);
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-tertiary);
}

.docs-search-overlay__results {
    max-height: 400px;
    overflow-y: auto;
    padding: var(--space-sm);
}

.docs-search-overlay__empty {
    padding: var(--space-xl) var(--space-md);
    text-align: center;
}

.docs-search-overlay__empty-text {
    color: var(--color-text-tertiary);
    font-size: var(--text-sm);
}

.docs-search-overlay__result {
    display: block;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: background var(--transition-fast);
}

.docs-search-overlay__result:hover,
.docs-search-overlay__result--active {
    background: var(--color-surface-2);
}

.docs-search-overlay__result-title {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-primary);
}

.docs-search-overlay__result-section {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
}

/* --- Dynamic search result hits --- */
.docs-search-overlay__list {
    list-style: none;
    margin: 0;
    padding: 0;
}
.docs-search-overlay__hit a {
    display: block;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: background var(--transition-fast);
}
.docs-search-overlay__hit a:hover {
    background: var(--color-surface-2);
}
.docs-search-overlay__hit-title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-accent-cyan);
}
.docs-search-overlay__hit-desc {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-top: 2px;
}
.docs-search-overlay__hit-snippet {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    margin-top: 4px;
    line-height: 1.4;
}

/* --- Sidebar: placeholder entries + active state --- */
.docs-nav__link--placeholder {
    color: var(--color-text-tertiary);
    cursor: not-allowed;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.docs-nav__soon {
    font-size: 10px;
    padding: 1px 6px;
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.docs-nav__link--active {
    color: var(--color-accent-cyan);
    background: var(--color-surface-1);
}

.docs-search-overlay__footer {
    display: flex;
    gap: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    border-top: 1px solid var(--color-border);
}

.docs-search-overlay__hint {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
}

.docs-search-overlay__hint kbd {
    display: inline-block;
    padding: 1px 4px;
    font-family: var(--font-ui);
    font-size: 10px;
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    border-radius: 3px;
    color: var(--color-text-tertiary);
}