frontend/src/ui/Panel.css

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

.ui-panel {
  position: relative;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-warm);
  overflow: hidden;
  color: var(--color-fg);
}

/* glass — warm backdrop-filter card (replaces legacy .glass-panel) */
.ui-panel--glass {
  background:
    radial-gradient(500px 240px at 15% 0%,   rgba(251, 188, 148, 0.05) 0%, transparent 70%),
    radial-gradient(500px 280px at 100% 100%, rgba(211, 134, 155, 0.045) 0%, transparent 70%),
    linear-gradient(160deg, rgba(47, 41, 39, 0.82) 0%, rgba(38, 33, 31, 0.82) 100%);
  backdrop-filter: var(--glass-blur-md);
  -webkit-backdrop-filter: var(--glass-blur-md);
}
.ui-panel--glass::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0),
    rgba(255, 255, 255, 0.08) 30%,
    rgba(255, 255, 255, 0.12) 50%,
    rgba(255, 255, 255, 0.08) 70%,
    rgba(255, 255, 255, 0)
  );
  pointer-events: none;
}

/* solid — opaque elevated surface */
.ui-panel--solid {
  background: linear-gradient(160deg, #2a2624 0%, #201c1b 100%);
  box-shadow: var(--shadow-md);
}

/* flat — inline, no elevation, just a subtle border */
.ui-panel--flat {
  background: rgba(0, 0, 0, 0.08);
  border-color: var(--color-border);
}

/* Padding scale */
.ui-panel--pad-none .ui-panel__body { padding: 0; }
.ui-panel--pad-sm   .ui-panel__body { padding: var(--space-4); }
.ui-panel--pad-md   .ui-panel__body { padding: var(--space-5); }
.ui-panel--pad-lg   .ui-panel__body { padding: var(--space-6); }

/* Header */
.ui-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  gap: var(--space-4);
}
.ui-panel__title {
  font-size: var(--text-md);
  font-weight: var(--weight-bold);
  color: var(--color-fg);
  letter-spacing: -0.01em;
  display: flex; align-items: center; gap: var(--space-3);
  min-width: 0;
}
.ui-panel__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

/* When there's a header, kill the body's top padding for visual balance */
.ui-panel__header + .ui-panel__body { padding-top: var(--space-4); }