/**
 * BH.Sidebar CSS — extends existing .sidebar styles.
 * Import via: <link rel="stylesheet" href="/components/sidebar.css" />
 *
 * Collapsed state: .sidebar--collapsed
 * Mobile open state: .sidebar.open (existing)
 * Screen-reader only: .sr-only
 */

/* ── Screen-reader only utility ────────────────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ── Desktop collapse: icon-only rail ─────────────────────────────────────── */
.sidebar--collapsed {
  width: 64px !important;
  overflow: visible;
}

/* Collapse: hide text labels */
.sidebar--collapsed .nav-text,
.sidebar--collapsed .nav-badge,
.sidebar--collapsed .nav-group-label,
.sidebar--collapsed .brand-text,
.sidebar--collapsed .sidebar-footer .nav-item > span {
  display: none !important;
}

/* Collapse: center icon buttons */
.sidebar--collapsed .nav-item {
  justify-content: center;
  padding: 10px 0;
  width: 100%;
}

/* Collapse: logo stays centered */
.sidebar--collapsed .sidebar-header {
  padding: 4px 8px 12px;
  justify-content: center;
  display: flex;
}

.sidebar--collapsed .sidebar-logo {
  justify-content: center;
}

/* Collapse: footer items collapse */
.sidebar--collapsed .sidebar-footer {
  padding: 8px 4px;
  gap: 2px;
}

/* Collapse transition — matches CSS transition vars */
.sidebar {
  transition:
    width var(--dur-base, 180ms) var(--ease, cubic-bezier(0.4, 0, 0.2, 1)),
    padding var(--dur-base, 180ms) var(--ease, cubic-bezier(0.4, 0, 0.2, 1));
}

/* Nav badge hidden when collapsed */
.sidebar--collapsed .nav-badge {
  display: none !important;
}

/* ── Keyboard focus ring ────────────────────────────────────────────────────── */
.sidebar .nav-item:focus-visible {
  outline: 2px solid var(--accent, #d97757);
  outline-offset: -2px;
  border-radius: var(--radius-sm, 10px);
}

/* ── Collapse toggle button in sidebar header ─────────────────────────────── */
.sidebar-collapse-trigger {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border, rgba(255, 255, 255, 0.075));
  border-radius: var(--radius-xs, 6px);
  background: transparent;
  color: var(--text-tertiary, #78766f);
  cursor: pointer;
  padding: 0;
  transition: background var(--dur-micro, 110ms),
              color var(--dur-micro, 110ms),
              border-color var(--dur-micro, 110ms);
  margin-left: auto;
  flex-shrink: 0;
}

.sidebar-collapse-trigger:hover {
  background: var(--surface-hover, #2b2b28);
  color: var(--text-primary, #f7f6f2);
  border-color: var(--border-strong, rgba(255, 255, 255, 0.13));
}

.sidebar-collapse-trigger:focus-visible {
  outline: 2px solid var(--accent, #d97757);
  outline-offset: 2px;
}

.sidebar-collapse-trigger:active {
  transform: scale(0.94);
}

/* Hide the collapse trigger when sidebar is already collapsed */
.sidebar--collapsed .sidebar-collapse-trigger {
  transform: rotate(180deg);
}

.sidebar--collapsed .sidebar-collapse-trigger:hover {
  transform: rotate(180deg) scale(1.05);
}

/* Mobile: hide collapse trigger — only overlay toggle is needed */
@media (max-width: 760px) {
  .sidebar-collapse-trigger {
    display: none;
  }
}

/* ── Mobile slide-in — breakpoint 760 đồng bộ shell ────────────────────────── */
@media (max-width: 760px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    height: 100dvh;
    z-index: 60;
    transform: translateX(-100%);
    transition: transform var(--dur-slow, 280ms) var(--ease-out, cubic-bezier(0.22, 1, 0.36, 1));
    box-shadow: var(--shadow-lg, 0 16px 40px rgba(0, 0, 0, 0.42));
    padding-top: 14px;
    width: min(280px, 86vw) !important;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  /* When collapsed and mobile, force full width nav labels visible */
  .sidebar.open .nav-text,
  .sidebar.open .nav-badge,
  .sidebar.open .nav-group-label,
  .sidebar.open .brand-text,
  .sidebar.open .sidebar-footer .nav-item > span {
    display: inline !important;
  }

  .sidebar.open .nav-item {
    justify-content: flex-start;
    padding: 10px 12px;
  }

  .sidebar.open .sidebar-header {
    padding: 4px 12px 12px;
    display: flex;
  }

  .sidebar.open .sidebar-logo {
    justify-content: flex-start;
  }

  .sidebar.open .sidebar-footer {
    padding: 8px 8px;
    flex-direction: column;
    gap: 2px;
  }

  .sidebar--collapsed.sidebar.open {
    width: min(280px, 86vw) !important;
  }
}

/* Overlay behavior is owned by styles.css LAYOUT UNITY (single source) */

/* ── Respect reduced motion ────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .sidebar {
    transition: none;
  }
}