// Layout: sidebar, topbar, main, grid, footer, responsive

// ────────────────────────
//  SKIP LINK + FOCUS
// ────────────────────────
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 8px 14px;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  transform: translateY(-200%);
  transition: transform 150ms ease;
}
.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

// Single visible focus style for keyboard users. :focus-visible avoids
// rings on mouse clicks while preserving the accessibility cue on Tab.
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}
.nav-link:focus-visible { outline-color: var(--primary); outline-offset: -2px; }
.search-box input:focus-visible { outline: none; } // input's own box-shadow handles it
#main-content:focus { outline: none; } // programmatic focus target only

// ────────────────────────
//  SIDEBAR
// ────────────────────────
.sidebar {
  position: fixed;
  left: 0; top: 0; bottom: 0;
  width: var(--sidebar-w);
  background: var(--sidebar-bg);
  z-index: 100;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  // Animate width changes when the rail-mode toggle fires; on mobile the
  // sidebar uses a transform-based slide instead so this is harmless there.
  transition: width 220ms cubic-bezier(0.2, 0, 0, 1);
}

.sidebar-brand {
  height: 56px;
  padding: 0 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--sidebar-border);
  flex-shrink: 0;
}
.brand-icon {
  width: 28px; height: 28px;
  background: var(--primary);
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 13px;
}
.brand-name {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  letter-spacing: -0.2px;
}
.brand-name small {
  font-weight: 400;
  color: var(--sidebar-text);
  font-size: 13px;
  margin-left: 2px;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}
.sidebar-nav::-webkit-scrollbar { width: 3px; }
.sidebar-nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.08); border-radius: 3px; }

.nav-group { padding: 0 8px; margin-bottom: 2px; }
.nav-label {
  padding: 16px 12px 4px;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: rgba(123,143,163,0.5);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  color: var(--sidebar-text);
  font-size: 13px;
  font-weight: var(--font-weight-normal);
  text-decoration: none;
  cursor: pointer;
  transition: background 120ms, color 120ms;
  margin-bottom: 1px;
  min-height: 32px;
}
.nav-link:hover {
  color: var(--sidebar-text-hover);
  background: var(--sidebar-hover);
  text-decoration: none;
}
.nav-link.active {
  color: var(--sidebar-text-active);
  background: var(--sidebar-active);
  font-weight: var(--font-weight-medium);
}
.nav-link .icon {
  width: 18px; height: 18px;
  opacity: 0.5;
  flex-shrink: 0;
}
.nav-link:hover .icon, .nav-link.active .icon { opacity: 0.85; }
.nav-link .badge {
  margin-left: auto;
  font-size: 10px;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 3px;
  line-height: 1.6;
}
.badge-red { background: rgba(214,57,57,0.15); color: #f87171; }
.badge-teal { background: var(--primary-lt); color: var(--primary); }
.badge-blue { background: rgba(66,153,225,0.12); color: #60a5fa; }

// ────────────────────────
//  SIDEBAR SUBMENU
// ────────────────────────
// Collapsed by default; only the group containing the active page auto-opens.
// Click a parent to expand/collapse — accordion behavior: opening one closes
// other open groups in the sidebar (one open at a time).
.nav-tree { display: flex; flex-direction: column; }

// Parent ("toggle") — same shape as a flat .nav-link, plus a chevron.
.nav-toggle {
  background: transparent;
  border: 0;
  font: inherit;
  width: 100%;
  text-align: left;
  cursor: pointer;
}
.nav-toggle .nav-text { flex: 1; }
.nav-chev {
  margin-left: auto;
  opacity: 0.55;
  transition: transform 200ms cubic-bezier(0.2, 0, 0, 1), opacity 120ms;
  flex-shrink: 0;
}
.nav-toggle:hover .nav-chev { opacity: 0.9; }
.nav-tree.open > .nav-toggle .nav-chev { transform: rotate(90deg); opacity: 1; }

// When the active page lives inside a tree, give the parent a subtle accent
// even when the tree is collapsed, so the user knows "they're in this group".
.nav-tree.has-active > .nav-toggle {
  color: var(--sidebar-text-hover);
}
.nav-tree.has-active > .nav-toggle .icon { opacity: 0.85; }

// Smooth expand/collapse using grid-template-rows trick (no JS height calc).
.nav-tree .nav-sub {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 220ms cubic-bezier(0.2, 0, 0, 1);
}
.nav-tree.open .nav-sub { grid-template-rows: 1fr; }
.nav-tree .nav-sub > .nav-sub-inner {
  overflow: hidden;
  min-height: 0;
  // Left guide rail that connects parent → children visually.
  position: relative;
  padding: 4px 0 4px 28px;
}
// Vertical guide line — sits flush with the icon column above.
.nav-tree .nav-sub > .nav-sub-inner::before {
  content: '';
  position: absolute;
  left: 19px;
  top: 4px;
  bottom: 4px;
  width: 1px;
  background: var(--sidebar-border);
}
.nav-tree.open .nav-sub > .nav-sub-inner::before {
  background: rgba(255, 255, 255, 0.10);
}

.nav-sublink {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 12px;
  font-size: 12.5px;
  color: var(--sidebar-text);
  border-radius: var(--radius-sm);
  text-decoration: none;
  position: relative;
  margin: 1px 0;
  transition: background 120ms, color 120ms, transform 120ms;
}
// Tiny horizontal "tick" connecting the rail to the link — a subtle but
// effective hierarchy cue without using bullets.
.nav-sublink::before {
  content: '';
  position: absolute;
  left: -9px;
  top: 50%;
  width: 8px;
  height: 1px;
  background: var(--sidebar-border);
  transform: translateY(-50%);
  transition: background 120ms, width 120ms;
}
.nav-sublink:hover {
  color: var(--sidebar-text-hover);
  background: var(--sidebar-hover);
  text-decoration: none;
}
.nav-sublink:hover::before { background: rgba(255, 255, 255, 0.25); }
.nav-sublink.active {
  color: var(--sidebar-text-active);
  background: var(--sidebar-active);
  font-weight: var(--font-weight-medium);
  // Active rail tick becomes primary teal and slightly bolder.
  &::before { background: var(--primary); width: 12px; left: -13px; }
}
.nav-sublink .badge {
  margin-left: auto;
  font-size: 10px;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 3px;
  line-height: 1.6;
}

// Sidebar footer / profile
.sidebar-footer {
  border-top: 1px solid var(--sidebar-border);
  padding: 8px;
  flex-shrink: 0;
}
.sidebar-user {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: background 120ms;
  cursor: pointer;
}
.sidebar-user:hover { background: var(--sidebar-hover); }
.sidebar-user .avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-dk));
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 600; color: #fff;
  flex-shrink: 0;
  position: relative;
}
.sidebar-user .avatar .online {
  position: absolute; bottom: -1px; right: -1px;
  width: 8px; height: 8px;
  background: var(--green);
  border: 2px solid var(--sidebar-bg);
  border-radius: 50%;
}
.sidebar-user-info { flex: 1; min-width: 0; }
.sidebar-user-info .name {
  color: #fff;
  font-size: 12.5px;
  font-weight: 500;
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sidebar-user-info .role {
  color: var(--sidebar-text);
  font-size: 11px;
  line-height: 1.2;
}
.sidebar-user .more-btn {
  width: 24px; height: 24px;
  border: none; background: transparent;
  color: var(--sidebar-text);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  opacity: 0;
  transition: opacity 120ms;
}
.sidebar-user:hover .more-btn { opacity: 1; }

// ────────────────────────
//  TOPBAR
// ────────────────────────
.topbar {
  position: fixed;
  top: 0;
  left: var(--sidebar-w);
  right: 0;
  height: 56px;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  z-index: 90;
  transition: left 220ms cubic-bezier(0.2, 0, 0, 1);
}
.topbar-left { display: flex; align-items: center; gap: var(--space-3); }

// Sidebar toggle is now always visible — collapses to rail on desktop,
// opens drawer on mobile. The legacy media-query that hid it is gone.
.sidebar-toggle {
  display: inline-flex;
  width: 34px;
  height: 34px;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
  transition: background 120ms, color 120ms;
}
.sidebar-toggle:hover { background: var(--body-bg); color: var(--text); }
.sidebar-toggle svg { width: 18px; height: 18px; }

.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  z-index: 95;
  opacity: 1;
  transition: opacity 180ms ease;
}
.sidebar-backdrop[hidden] { display: none; }
.breadcrumb {
  display: flex; align-items: center; gap: var(--space-1);
  font-size: 13px; color: var(--text-muted);
}
.breadcrumb .current { color: var(--text); font-weight: var(--font-weight-medium); }
.breadcrumb .sep { color: var(--text-disabled); }

.search-box {
  position: relative;
  width: 240px;
}
.search-box input {
  width: 100%;
  height: 32px;
  padding: 0 10px 0 32px;
  background: var(--body-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font: inherit;
  font-size: 13px;
  color: var(--text);
  outline: none;
  transition: border-color 150ms, box-shadow 150ms;
}
.search-box input::placeholder { color: var(--text-disabled); }
.search-box input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-lt);
}
.search-box .s-icon {
  position: absolute;
  left: 9px; top: 50%;
  transform: translateY(-50%);
  width: 14px; height: 14px;
  color: var(--text-muted);
}
.search-box kbd {
  position: absolute;
  right: 6px; top: 50%;
  transform: translateY(-50%);
  padding: 0 5px;
  font-family: inherit;
  font-size: 10px;
  color: var(--text-muted);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  line-height: 18px;
}

.topbar-right { display: flex; align-items: center; gap: 2px; }
.tb-btn {
  width: 32px; height: 32px;
  border: none; background: transparent;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
  transition: background 120ms, color 120ms;
  position: relative;
}
.tb-btn:hover { background: var(--body-bg); color: var(--text); }
.tb-btn svg { width: 18px; height: 18px; }
.tb-btn .dot {
  position: absolute; top: 6px; right: 6px;
  width: 6px; height: 6px;
  background: var(--red);
  border: 1.5px solid white;
  border-radius: 50%;
}
.tb-avatar {
  width: 28px; height: 28px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--primary), var(--primary-dk));
  display: flex; align-items: center; justify-content: center;
  font: inherit;
  font-size: 11px;
  font-weight: 600;
  color: white;
  margin-left: 6px;
  cursor: pointer;
  padding: 0;
  transition: transform 120ms;
}
.tb-avatar:hover { transform: scale(1.06); }

// ────────────────────────
//  MAIN LAYOUT
// ────────────────────────
.main {
  margin-left: var(--sidebar-w);
  padding-top: 56px;
  min-height: 100vh;
  transition: margin-left 220ms cubic-bezier(0.2, 0, 0, 1);
}
.page-wrapper { padding: 20px 24px 40px; }

// Page header
.page-header { margin-bottom: 20px; }
.page-pretitle {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--text-muted);
  margin-bottom: 2px;
}
.page-title {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text);
  margin: 0;
}
.page-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
}
.page-actions { display: flex; gap: 6px; flex-wrap: wrap; }

// ────────────────────────
//  GRID
// ────────────────────────
.row { display: grid; gap: var(--space-4); margin-bottom: 16px; }
.row:last-child { margin-bottom: 0; }
// minmax(0, …) lets wide intrinsic content (tables, charts, long text)
// stay contained within its grid track instead of pushing the track wider
// than its share. Critical for tables and chart cards.
.col-4   { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.col-3   { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.col-2   { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.col-8-4 { grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); }
.col-4-8 { grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); }
.col-1   { grid-template-columns: minmax(0, 1fr); }

// ────────────────────────
//  FOOTER
// ────────────────────────
.footer {
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color-light);
}
.footer a { color: var(--primary); }

// ────────────────────────
//  RESPONSIVE
// ────────────────────────
// Asymmetric 8-4 / 4-8 splits stack first — the narrow column gets cramped
// well before 3-col rows do (charts legend, sidebar widgets need ~340px).
@media (max-width: 1100px) {
  .col-8-4, .col-4-8 { grid-template-columns: minmax(0, 1fr); }
}
// col-4 → col-2 first since 4 wide tiles cramp earliest
@media (max-width: 1200px) {
  .col-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
// 3-col rows drop to 2 here — at this width with the sidebar visible the
// content area is ~640px, so 3 cards (~210px each) become uncomfortably
// narrow for stat sparklines + value rows.
@media (max-width: 920px) {
  .col-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 220ms ease;
    will-change: transform;
  }
  .sidebar.open { transform: translateX(0); }
  .main { margin-left: 0; }
  .topbar { left: 0; padding: 0 12px; }
  // The 240px search box, breadcrumb, and notification/message buttons can't
  // coexist with a 32px avatar inside a 375px viewport without forcing the
  // layout viewport to scale. Drop the wide pieces; cmd-K still works for
  // hardware-keyboard users, and page-pretitle/page-title carry breadcrumb
  // context. Avatar gets a real touch target.
  .topbar .breadcrumb,
  .topbar .search-box,
  .topbar .tb-notifications,
  .topbar .tb-messages { display: none; }
  .topbar .tb-avatar { width: 32px; height: 32px; }
  // minmax(0, 1fr) — without it a wide intrinsic child (table, code block,
  // long unbroken text) pushes the column wider than the viewport, which
  // forces the mobile browser to scale the whole layout to fit.
  .col-4, .col-3, .col-2 { grid-template-columns: minmax(0, 1fr); }
  .page-wrapper { padding: 12px; }
  body.sidebar-open { overflow: hidden; }
  // Mobile rail mode never applies — drawer handles narrow viewports.
  body.sidebar-rail .sidebar { width: var(--sidebar-w); }
}
@media (min-width: 769px) {
  .sidebar-backdrop { display: none !important; }
}

// ────────────────────────
//  RAIL MODE (desktop sidebar collapsed to icons)
// ────────────────────────
// Activated by `body.sidebar-rail`. Shrinks the sidebar to a 64px icon column
// while keeping all click targets reachable. Submenus collapse and re-open as
// flyout menus (handled in shell.js). Only applies above 768px — mobile uses
// the drawer instead.
@media (min-width: 769px) {
  body.sidebar-rail {
    --sidebar-w: 64px;
  }
  body.sidebar-rail .sidebar { overflow: visible; }
  body.sidebar-rail .sidebar-brand {
    padding: 0;
    justify-content: center;
  }
  body.sidebar-rail .brand-name { display: none; }
  body.sidebar-rail .nav-group { padding: 0 8px; }
  body.sidebar-rail .nav-label { display: none; }
  body.sidebar-rail .nav-link {
    justify-content: center;
    gap: 0;
    padding: 8px;
    position: relative;
  }
  body.sidebar-rail .nav-link .nav-text,
  body.sidebar-rail .nav-link .badge { display: none; }
  body.sidebar-rail .nav-chev { display: none; }
  // Submenu inline tree is hidden in rail mode — flyout takes over.
  body.sidebar-rail .nav-tree .nav-sub { display: none; }
  body.sidebar-rail .sidebar-user {
    padding: 8px;
    justify-content: center;
  }
  body.sidebar-rail .sidebar-user-info,
  body.sidebar-rail .sidebar-user .more-btn { display: none; }

  // Hover tooltip — uses ::after off the nav-link so we don't add markup.
  // The tooltip text comes from a `data-rail-label` attribute that we set
  // dynamically in shell.js when rail mode is enabled.
  body.sidebar-rail .nav-link[data-rail-label]::after {
    content: attr(data-rail-label);
    position: absolute;
    left: calc(100% + 12px);
    top: 50%;
    transform: translateY(-50%) translateX(-4px);
    background: var(--text);
    color: var(--bg-surface);
    font-size: 11.5px;
    font-weight: var(--font-weight-medium);
    padding: 5px 9px;
    border-radius: var(--radius-sm);
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity 120ms, transform 120ms;
    z-index: 110;
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.18);
  }
  body.sidebar-rail .nav-link[data-rail-label]:hover::after,
  body.sidebar-rail .nav-link[data-rail-label]:focus-visible::after {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
  }

  // Rotate the toggle icon when collapsed for visual affordance.
  body.sidebar-rail .sidebar-toggle svg { transform: rotate(180deg); }
  .sidebar-toggle svg { transition: transform 200ms ease; }
}