/* ====== Buttons ====== */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  height: 36px; padding: 0 14px; border: none;
  border-radius: var(--radius-md); font-family: var(--font-sans);
  font-size: var(--font-size-md); font-weight: var(--font-weight-medium);
  cursor: pointer; transition: all var(--transition-fast);
  white-space: nowrap; user-select: none; line-height: 1;
}
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn--primary { background: var(--color-primary); color: var(--color-text-inverse); }
.btn--primary:hover:not(:disabled) { background: var(--color-primary-hover); }
.btn--secondary { background: var(--color-surface); color: var(--color-text-primary); border: 1px solid var(--color-border); }
.btn--secondary:hover:not(:disabled) { background: var(--color-surface-hover); }
.btn--danger { background: var(--color-danger); color: white; }
.btn--danger:hover:not(:disabled) { opacity: 0.9; }
.btn--ghost { background: transparent; color: var(--color-text-secondary); }
.btn--ghost:hover:not(:disabled) { background: var(--color-surface-hover); color: var(--color-text-primary); }
.btn--sm { height: 28px; padding: 0 10px; font-size: var(--font-size-sm); border-radius: var(--radius-sm); }
.btn--lg { height: 44px; padding: 0 20px; font-size: var(--font-size-lg); }
.btn--icon { width: 36px; padding: 0; justify-content: center; }

/* ====== Panel (page sections) ====== */
.panel {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-sm);
}
.panel__header {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}
.panel__title { font-size: var(--font-size-md); font-weight: var(--font-weight-semibold); }
.panel__body { padding: var(--space-lg); }

/* ====== Cards ====== */
.card {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
}
.card--hover:hover { box-shadow: var(--shadow-md); }
.card__header { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--space-md); }
.card__title { font-size: var(--font-size-md); font-weight: var(--font-weight-semibold); }
.card__subtitle { font-size: var(--font-size-sm); color: var(--color-text-secondary); }

/* ====== Metric Cards ====== */
.metric-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-md);
}
.metric-card {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: var(--space-md) var(--space-lg);
}
.metric-card__label {
  font-size: var(--font-size-xs); color: var(--color-text-tertiary);
  text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 4px;
}
.metric-card__value {
  font-size: var(--font-size-2xl); font-weight: var(--font-weight-semibold);
  line-height: 1.2;
}
.metric-card__trend {
  display: flex; align-items: center; gap: 4px;
  font-size: var(--font-size-sm); margin-top: 4px;
}
.metric-card__trend--up { color: var(--color-success); }
.metric-card__trend--down { color: var(--color-danger); }
.metric-card__trend--neutral { color: var(--color-text-tertiary); }

/* ====== Badges ====== */
.badge {
  display: inline-flex; align-items: center; padding: 1px 8px;
  border-radius: 9999px; font-size: var(--font-size-xs); font-weight: var(--font-weight-medium);
  line-height: 1.6;
}
.badge--success { background: var(--color-success-light); color: var(--color-success); }
.badge--warning { background: var(--color-warning-light); color: var(--color-warning); }
.badge--danger { background: var(--color-danger-light); color: var(--color-danger); }
.badge--info { background: var(--color-info-light); color: var(--color-info); }
.badge--neutral { background: var(--color-surface-secondary); color: var(--color-text-secondary); }

/* Status dots (inline with text) */
.status-dot { display: inline-block; width: 6px; height: 6px; border-radius: 50%; flex-shrink: 0; }
.status-dot--success { background: var(--color-success); }
.status-dot--warning { background: var(--color-warning); }
.status-dot--danger { background: var(--color-danger); }
.status-dot--neutral { background: var(--color-text-tertiary); }

/* ====== Tables ====== */
.table-wrap { overflow-x: auto; }
.table { width: 100%; border-collapse: collapse; font-size: var(--font-size-base); }
.table th {
  text-align: left; padding: 10px 12px; font-size: var(--font-size-xs);
  color: var(--color-text-tertiary); font-weight: var(--font-weight-semibold);
  background: var(--color-surface-secondary); border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}
.table td { padding: 10px 12px; border-bottom: 1px solid var(--color-border-light); }
.table tr:hover td { background: var(--color-surface-hover); }
.table--sm th, .table--sm td { padding: 6px 10px; font-size: var(--font-size-sm); }

/* Table toolbar */
.table-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-sm); margin-bottom: var(--space-md); flex-wrap: wrap;
}
.table-toolbar__filters { display: flex; gap: var(--space-sm); flex-wrap: wrap; }

/* ====== Filter Bar ====== */
.filter-bar {
  display: flex; align-items: flex-end; gap: var(--space-md);
  padding: var(--space-md) var(--space-lg); flex-wrap: wrap;
}
.filter-bar .form-group { margin-bottom: 0; }
.filter-bar__actions { display: flex; gap: var(--space-sm); align-items: center; }

/* ====== Forms ====== */
.form-group { margin-bottom: var(--space-md); }
.form-label { display: block; font-size: var(--font-size-sm); font-weight: var(--font-weight-medium); color: var(--color-text-primary); margin-bottom: var(--space-xs); }
.form-input, .form-select, .form-textarea {
  width: 100%; padding: 8px 12px; border: 1px solid var(--color-border);
  border-radius: var(--radius-md); background: var(--color-surface);
  color: var(--color-text-primary); font-family: var(--font-sans);
  font-size: var(--font-size-base); transition: border-color var(--transition-fast);
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none; border-color: var(--color-border-focus); box-shadow: 0 0 0 3px var(--color-primary-light);
}
.form-input::placeholder { color: var(--color-text-tertiary); }
.form-select { cursor: pointer; }
.form-hint { font-size: var(--font-size-sm); color: var(--color-text-tertiary); margin-top: 4px; }
.form-error { font-size: var(--font-size-sm); color: var(--color-danger); margin-top: 4px; }

/* Toggle Switch */
.form-toggle {
  width: 44px; height: 24px; border-radius: 12px; background: var(--color-border);
  cursor: pointer; transition: background 150ms ease; position: relative; flex-shrink: 0;
}
.form-toggle--on { background: var(--color-primary); }
.form-toggle__knob {
  width: 20px; height: 20px; border-radius: 50%; background: white;
  position: absolute; top: 2px; left: 2px; transition: left 150ms ease;
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
}
.form-toggle--on .form-toggle__knob { left: 22px; }

/* ====== Skeleton Loading ====== */
.skeleton { background: linear-gradient(90deg, var(--color-surface-secondary) 25%, var(--color-bg) 50%, var(--color-surface-secondary) 75%); background-size: 200% 100%; animation: skeleton-pulse 1.5s infinite; border-radius: var(--radius-sm); }
@keyframes skeleton-pulse { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }
.skeleton--text { height: 13px; width: 100%; margin-bottom: 8px; }
.skeleton--title { height: 20px; width: 50%; margin-bottom: 12px; }
.skeleton--card { height: 100px; width: 100%; }
.skeleton--chart { height: 260px; width: 100%; }

/* ====== Spinner (ring) ====== */
.spinner {
  display: inline-block; width: 28px; height: 28px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spinner-rotate 0.7s linear infinite;
  vertical-align: middle; flex-shrink: 0;
}
.spinner--sm { width: 16px; height: 16px; border-width: 2px; }
.spinner--lg { width: 40px; height: 40px; border-width: 4px; }
@keyframes spinner-rotate { to { transform: rotate(360deg); } }
/* Ensure spinner is visible on dark surfaces */
[data-theme="dark"] .spinner {
  border-color: var(--color-border);
  border-top-color: var(--color-primary);
}

/* ====== Alerts ====== */
.alert-banner {
  display: flex; align-items: center; gap: var(--space-sm); padding: 10px 16px;
  border-radius: var(--radius-md); font-size: var(--font-size-sm); margin-bottom: var(--space-md);
}
.alert-banner--red { background: var(--color-danger-light); color: var(--color-danger); border-left: 3px solid var(--color-danger); }
.alert-banner--yellow { background: var(--color-warning-light); color: var(--color-warning); border-left: 3px solid var(--color-warning); }
.alert-banner--green { background: var(--color-success-light); color: var(--color-success); border-left: 3px solid var(--color-success); }

/* ====== Tabs ====== */
.tabs { display: flex; gap: 0; border-bottom: 2px solid var(--color-border); margin-bottom: var(--space-lg); }
.tab {
  padding: 10px 18px; font-size: var(--font-size-sm); font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary); cursor: pointer; border-bottom: 2px solid transparent;
  margin-bottom: -2px; transition: all var(--transition-fast);
}
.tab:hover { color: var(--color-text-primary); }
.tab--active { color: var(--color-primary); border-bottom-color: var(--color-primary); }

/* ====== Chart Container ====== */
.chart-container {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: var(--space-lg);
  position: relative; min-height: 280px;
}
.chart-container canvas { width: 100% !important; }

/* ====== Tag Cloud ====== */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; padding: var(--space-sm) 0; }
.tag { display: inline-block; padding: 3px 10px; border-radius: 9999px; background: var(--color-info-light); color: var(--color-info); font-size: var(--font-size-sm); white-space: nowrap; }

/* ====== Modal ====== */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.5); display: flex;
  align-items: center; justify-content: center; z-index: 1000;
}
.modal {
  background: var(--color-surface); border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl); max-width: 560px; width: 90vw;
  max-height: 85vh; overflow-y: auto; padding: var(--space-xl);
}
.modal__title { font-size: var(--font-size-xl); font-weight: var(--font-weight-semibold); margin-bottom: var(--space-md); }

/* ====== Empty State ====== */
.empty-state { text-align: center; padding: var(--space-3xl) var(--space-xl); color: var(--color-text-secondary); }
.empty-state__icon { font-size: 40px; margin-bottom: var(--space-md); opacity: 0.5; }
.empty-state__title { font-size: var(--font-size-md); font-weight: var(--font-weight-medium); margin-bottom: 4px; color: var(--color-text-primary); }
.empty-state__desc { font-size: var(--font-size-sm); max-width: 380px; margin: 0 auto var(--space-lg); color: var(--color-text-tertiary); }

/* ====== Toast (simple) ====== */
.toast {
  position: fixed; bottom: 24px; right: 24px; z-index: 2000;
  padding: 12px 20px; border-radius: var(--radius-md); font-size: var(--font-size-sm);
  box-shadow: var(--shadow-lg); animation: toast-in 200ms ease;
  max-width: 400px;
}
@keyframes toast-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
.toast--success { background: var(--color-success); color: white; }
.toast--error { background: var(--color-danger); color: white; }
.toast--info { background: var(--color-info); color: white; }

/* ====== Section header ====== */
.section-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: var(--space-lg); flex-wrap: wrap; gap: var(--space-sm);
}
.section-header__title { font-size: var(--font-size-xl); font-weight: var(--font-weight-semibold); }