/*
A26 Web Design System — Sidebar Component
Version: v1.0.0-alpha.0008-sidebar-refinement

Sidebars belong to the navigation/control layer. They should feel visually
separate from content, preserve navigation hierarchy, and support persistent
selection in split-view layouts.
*/

@layer a26.components {
  :root {
    --a26-sidebar-width: 280px;
    --a26-sidebar-width-compact: 240px;
    --a26-sidebar-width-large: 320px;
    --a26-sidebar-padding-x: 14px;
    --a26-sidebar-padding-y: 18px;
    --a26-sidebar-gap: 14px;
    --a26-sidebar-radius: 28px;
    --a26-sidebar-bg: var(--a26-material-regular-fill);
    --a26-sidebar-blur: var(--a26-material-regular-blur);
    --a26-sidebar-border: var(--a26-separator);
    --a26-sidebar-row-height: 38px;
    --a26-sidebar-row-gap: 6px;
    --a26-sidebar-row-padding-x: 10px;
    --a26-sidebar-row-radius: 12px;
    --a26-sidebar-row-selected-bg: var(--a26-accent);
    --a26-sidebar-row-selected-text: #ffffff;
    --a26-sidebar-icon-size: 18px;
    --a26-sidebar-icon-color: var(--a26-text-secondary);
    --a26-sidebar-icon-selected-color: #ffffff;
  }

  .a26-sidebar {
    position: relative;
    min-height: 100vh;
    width: var(--a26-sidebar-width);
    padding: var(--a26-sidebar-padding-y) var(--a26-sidebar-padding-x);
    background: var(--a26-sidebar-bg);
    backdrop-filter: var(--a26-sidebar-blur);
    -webkit-backdrop-filter: var(--a26-sidebar-blur);
    border-inline-end: 1px solid var(--a26-sidebar-border);
    display: flex;
    flex-direction: column;
    gap: var(--a26-sidebar-gap);
    color: var(--a26-text-primary);
  }

  .a26-sidebar[data-size="small"] {
    width: var(--a26-sidebar-width-compact);
    --a26-sidebar-row-height: 34px;
    --a26-sidebar-icon-size: 16px;
  }

  .a26-sidebar[data-size="large"] {
    width: var(--a26-sidebar-width-large);
    --a26-sidebar-row-height: 42px;
    --a26-sidebar-icon-size: 20px;
  }

  .a26-sidebar__header {
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 44px;
    padding-inline: 4px;
  }

  .a26-sidebar__mark {
    width: 34px;
    height: 34px;
    border-radius: var(--a26-app-icon-radius, 22.37%);
    clip-path: var(--a26-app-icon-shape, inset(0 round 22.37%));
    display: inline-grid;
    place-items: center;
    font: var(--a26-font-caption-1);
    font-weight: 700;
    color: white;
    background: var(--a26-accent);
    box-shadow: inset 0 0 0 1px #ffffff40;
  }

  .a26-sidebar__title {
    margin: 0;
    font: var(--a26-font-title-3);
    font-weight: var(--a26-type-title-3-weight-bold);
    line-height: 1.1;
  }

  .a26-sidebar__subtitle {
    margin: 1px 0 0;
    font: var(--a26-font-caption-1);
    color: var(--a26-text-secondary);
  }

  .a26-sidebar__section {
    display: grid;
    gap: var(--a26-sidebar-row-gap);
  }

  .a26-sidebar__section-title {
    margin: 8px var(--a26-sidebar-row-padding-x) 2px;
    font: var(--a26-font-caption-1);
    color: var(--a26-text-secondary);
    text-transform: uppercase;
    letter-spacing: .045em;
  }

  .a26-sidebar__item {
    min-height: var(--a26-sidebar-row-height);
    padding: 6px var(--a26-sidebar-row-padding-x);
    display: flex;
    align-items: center;
    gap: 10px;
    border-radius: var(--a26-sidebar-row-radius);
    color: var(--a26-text-primary);
    text-decoration: none;
    line-height: 1.15;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
  }

  .a26-sidebar__item:hover {
    background: var(--a26-fill-quaternary);
  }

  .a26-sidebar__item:active {
    transform: scale(.99);
    background: var(--a26-fill-tertiary);
  }

  .a26-sidebar__item[aria-current="page"],
  .a26-sidebar__item[aria-selected="true"] {
    background: var(--a26-sidebar-row-selected-bg);
    color: var(--a26-sidebar-row-selected-text);
    font-weight: 600;
  }

  .a26-sidebar__item[aria-current="page"]:hover,
  .a26-sidebar__item[aria-selected="true"]:hover {
    background: var(--a26-sidebar-row-selected-bg);
  }

  .a26-sidebar__item:focus-visible {
    outline: 3px solid color-mix(in srgb, var(--a26-accent) 70%, transparent);
    outline-offset: 2px;
  }

  .a26-sidebar__icon {
    width: var(--a26-sidebar-icon-size);
    height: var(--a26-sidebar-icon-size);
    flex: 0 0 var(--a26-sidebar-icon-size);
    display: inline-grid;
    place-items: center;
    color: var(--a26-sidebar-icon-color);
  }

  .a26-sidebar__item[aria-current="page"] .a26-sidebar__icon,
  .a26-sidebar__item[aria-selected="true"] .a26-sidebar__icon {
    color: var(--a26-sidebar-icon-selected-color);
  }

  .a26-sidebar__label {
    min-width: 0;
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font: var(--a26-font-subheadline);
  }

  .a26-sidebar__badge {
    min-width: 22px;
    height: 20px;
    padding-inline: 7px;
    border-radius: var(--a26-radius-pill);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font: var(--a26-font-caption-1);
    color: var(--a26-text-secondary);
    background: var(--a26-fill-tertiary);
  }

  .a26-sidebar__disclosure {
    color: var(--a26-text-tertiary);
    font: var(--a26-font-footnote);
  }

  .a26-sidebar__footer {
    margin-top: auto;
    padding-top: var(--a26-space-3);
    border-top: 1px solid var(--a26-separator);
  }

  @media (max-width: 760px) {
    .a26-sidebar {
      width: 100%;
      min-height: auto;
      border-inline-end: 0;
      border-bottom: 1px solid var(--a26-sidebar-border);
    }
  }
}