/* ──────────────────────────────────────────────────────────────────────
 * Page — header, tabs, panels, stats
 *
 * Common page-level building blocks: every operator-facing screen uses
 * page-header / page-tabs / panel to keep a uniform frame.
 * ──────────────────────────────────────────────────────────────────── */

.page {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.page-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

@media (min-width: 768px) {
  .page-header {
    flex-direction: row;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-6);
  }
}

.page-header__text { min-width: 0; flex: 1; }

.page-header__title-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.page-header__back {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 2rem;
  height: 2rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-paper-elevated);
  color: var(--color-ink-secondary);
  font-size: 1rem;
  text-decoration: none;
  transition: color 0.12s ease, border-color 0.12s ease, background 0.12s ease;
}

.page-header__back:hover {
  color: var(--color-ink);
  border-color: var(--color-ink-secondary);
  background: var(--color-paper-sunken);
}

.page-header__back:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.page-header__title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1.3;
}

.page-header__subtitle {
  font-size: 0.875rem;
  color: var(--color-ink-tertiary);
  margin-top: 0.375rem;
}

.page-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

/* ── Tabs ───────────────────────────────────────────────────────────── */

.page-tabs {
  display: flex;
  gap: var(--space-1);
  border-bottom: 1px solid var(--color-border);
  overflow-x: auto;
  overflow-y: hidden;
  margin-bottom: var(--space-6);
}

/* Pages wrapped in `.page` already get flex-gap between children,
   so don't stack an extra margin on top of that. */
.page > .page-tabs {
  margin-bottom: 0;
}

.page-tabs__item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.625rem var(--space-3);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-ink-secondary);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.12s ease, border-color 0.12s ease;
}

.page-tabs__item:hover {
  color: var(--color-ink);
}

.page-tabs__item--active {
  color: var(--color-accent-text);
  border-bottom-color: var(--color-accent);
}

.page-tabs__count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.25rem;
  height: 1.125rem;
  padding: 0 0.375rem;
  border-radius: 999px;
  font-size: 0.6875rem;
  font-weight: 600;
  background: var(--color-paper-sunken);
  color: var(--color-ink-secondary);
}

.page-tabs__item--active .page-tabs__count {
  background: var(--color-accent-light);
  color: var(--color-accent-text);
}

/* ── Panel ──────────────────────────────────────────────────────────── */

.panel {
  background: var(--color-paper-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.panel__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.panel__title-group { min-width: 0; flex: 1; }

.panel__title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-ink);
}

.panel__subtitle {
  font-size: 0.8125rem;
  color: var(--color-ink-tertiary);
  margin-top: 0.125rem;
}

.panel__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.panel__body {
  padding: var(--space-5);
}

.panel__body--flush { padding: 0; }

.panel__footer {
  padding: var(--space-3) var(--space-5);
  border-top: 1px solid var(--color-border);
  background: var(--color-paper);
  font-size: 0.8125rem;
  color: var(--color-ink-tertiary);
}

/* ── Stat card ──────────────────────────────────────────────────────── */

.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
}

@media (min-width: 768px) {
  .stat-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.stat {
  background: var(--color-paper-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-4) var(--space-5);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.stat__label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-ink-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.stat__value {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1.1;
}

.stat__value--accent { color: var(--color-accent); }
.stat__value--warning { color: var(--color-warning); }
.stat__value--danger  { color: var(--color-danger); }
.stat__value--success { color: var(--color-success); }

.stat__trend {
  font-size: 0.75rem;
  color: var(--color-ink-tertiary);
  margin-top: 0.25rem;
}

.stat--link {
  display: block;
  text-decoration: none;
  transition: border-color 0.12s ease, box-shadow 0.12s ease, transform 0.12s ease;
}

.stat--link:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-md);
}

/* ── Split layout ───────────────────────────────────────────────────── */

.split {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 1024px) {
  .split--main-rail { grid-template-columns: minmax(0, 1fr) 20rem; }
  .split--rail-main { grid-template-columns: 18rem minmax(0, 1fr); }
  .split--halves    { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ── Button primitives ─────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 0.875rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.12s ease, border-color 0.12s ease, color 0.12s ease, box-shadow 0.12s ease;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.btn--primary:hover { background: var(--color-accent-hover); }

.btn--secondary {
  background: var(--color-paper-elevated);
  border-color: var(--color-border);
  color: var(--color-ink-secondary);
}

.btn--secondary:hover {
  background: var(--color-paper-sunken);
  color: var(--color-ink);
}

.btn--ghost {
  color: var(--color-ink-secondary);
  background: transparent;
}

.btn--ghost:hover {
  background: var(--color-paper-sunken);
  color: var(--color-ink);
}

.btn--danger {
  background: var(--color-danger);
  color: #fff;
}

.btn--danger:hover { filter: brightness(0.95); }

.btn--sm {
  padding: 0.375rem 0.625rem;
  font-size: 0.8125rem;
}

.btn__icon { font-size: 0.9375rem; flex-shrink: 0; }

/* ── Chips (inline meta) ───────────────────────────────────────────── */

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.125rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 999px;
  background: var(--color-paper-sunken);
  color: var(--color-ink-secondary);
}

.chip--accent { background: var(--color-accent-light); color: var(--color-accent-text); }
.chip--success { background: var(--color-success-light); color: var(--color-success); }
.chip--warning { background: var(--color-warning-light); color: var(--color-warning); }
.chip--danger { background: var(--color-danger-light); color: var(--color-danger); }