/* ============================================================
   PulseIQ — Layout Primitives
   css/layout.css

   Page-level structure: module ribbon, page header,
   content area, sidebar, grid helpers.
   Depends on design-tokens.css being loaded first.
============================================================ */

/* ── Module Ribbon (top nav) ──────────────────────────────── */
.module-ribbon {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0 16px;
  height: 48px;
  overflow-x: auto;
  scrollbar-width: none;
  flex-shrink: 0;
}
.module-ribbon::-webkit-scrollbar { display: none; }

.ribbon-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 800;
  color: var(--text);
  text-decoration: none;
  flex-shrink: 0;
  margin-right: 8px;
}
.ribbon-logo-mark {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 900;
  color: #fff;
}

.ribbon-divider {
  width: 1px;
  height: 20px;
  background: var(--border);
  flex-shrink: 0;
  margin: 0 4px;
}

.ribbon-link {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--transition), color var(--transition);
  flex-shrink: 0;
}
.ribbon-link:hover {
  background: var(--surface2);
  color: var(--text);
}
.ribbon-link.active {
  background: rgba(59, 130, 246, 0.12);
  color: var(--accent);
  font-weight: 600;
}
.ribbon-link-icon {
  font-size: 14px;
}

/* Right-side ribbon controls (theme toggle, user menu) */
.ribbon-end {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.theme-toggle {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}
.theme-toggle:hover {
  background: var(--surface2);
  border-color: var(--border2);
  color: var(--text);
}

.user-chip {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 4px 10px 4px 4px;
  border-radius: 100px;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  background: transparent;
}
.user-chip:hover {
  border-color: var(--border2);
  background: var(--surface2);
}

/* ── Page Header ──────────────────────────────────────────── */
.page-header {
  padding: 20px 24px 0;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.page-title {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.4px;
}
.page-sub {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 3px;
}
.page-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* ── Main content wrapper ─────────────────────────────────── */
.page-content {
  padding: 20px 24px 40px;
  max-width: 1400px;
  margin: 0 auto;
}

/* ── Stats row ────────────────────────────────────────────── */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}

/* ── Grid layouts ─────────────────────────────────────────── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }

@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .page-header { padding: 14px 16px 0; }
  .page-content { padding: 14px 16px 32px; }
  .module-ribbon { padding: 0 10px; }
}

/* ── Two-panel sidebar layout ─────────────────────────────── */
.layout-sidebar {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 20px;
  align-items: start;
}
.layout-sidebar-sm {
  grid-template-columns: 220px 1fr;
}

@media (max-width: 900px) {
  .layout-sidebar,
  .layout-sidebar-sm {
    grid-template-columns: 1fr;
  }
}

/* ── Sticky sidebar panel ─────────────────────────────────── */
.sidebar-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: sticky;
  top: 68px;
}
.sidebar-panel-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}
.sidebar-nav-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  font-size: 13px;
  color: var(--text-muted);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  border-left: 2px solid transparent;
}
.sidebar-nav-item:hover {
  background: var(--surface2);
  color: var(--text);
}
.sidebar-nav-item.active {
  background: rgba(59, 130, 246, 0.08);
  color: var(--accent);
  border-left-color: var(--accent);
  font-weight: 600;
}

/* ── Flex utility row ─────────────────────────────────────── */
.flex-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.flex-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.flex-wrap {
  flex-wrap: wrap;
}

/* ── Gap helpers ──────────────────────────────────────────── */
.gap-4  { gap: 4px; }
.gap-8  { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.gap-20 { gap: 20px; }
.gap-24 { gap: 24px; }

/* ── Spacing helpers ──────────────────────────────────────── */
.mb-4   { margin-bottom: 4px; }
.mb-8   { margin-bottom: 8px; }
.mb-12  { margin-bottom: 12px; }
.mb-16  { margin-bottom: 16px; }
.mb-20  { margin-bottom: 20px; }
.mb-24  { margin-bottom: 24px; }
.mt-8   { margin-top: 8px; }
.mt-12  { margin-top: 12px; }
.mt-16  { margin-top: 16px; }
.mt-20  { margin-top: 20px; }

/* ── Text helpers ─────────────────────────────────────────── */
.text-sm    { font-size: 12px; }
.text-muted { color: var(--text-muted); }
.text-dim   { color: var(--text-dim); }
.text-accent{ color: var(--accent); }
.text-green { color: var(--green); }
.text-yellow{ color: var(--yellow); }
.text-red   { color: var(--red); }
.font-bold  { font-weight: 700; }
.font-semi  { font-weight: 600; }
.text-center{ text-align: center; }
.text-right { text-align: right; }
.truncate   { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ── Overflow / scroll areas ──────────────────────────────── */
.scroll-x {
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border2) transparent;
}
.scroll-x::-webkit-scrollbar { height: 4px; }
.scroll-x::-webkit-scrollbar-track { background: transparent; }
.scroll-x::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 4px; }