/* ============================================
   RenDS — Banner / Alert Component
   ============================================
   Inline messages for success, warning, error, info.
   CSS-only. No JS needed (dismiss is optional JS).

   Different from Toast: Banner is inline, persistent,
   part of the page flow. Toast is ephemeral overlay.

   Usage:
     <div class="ren-banner" role="status">
       <span class="ren-banner-icon">ℹ</span>
       <div class="ren-banner-content">
         <strong class="ren-banner-title">Info</strong>
         <p class="ren-banner-message">Your changes have been saved.</p>
       </div>
     </div>

     <div class="ren-banner ren-banner-danger" role="alert">
       <span class="ren-banner-icon">!</span>
       <div class="ren-banner-content">
         <strong class="ren-banner-title">Error</strong>
         <p class="ren-banner-message">Could not save changes.</p>
       </div>
       <button class="ren-banner-dismiss" aria-label="Dismiss">&times;</button>
     </div>

   Simple (no title):
     <div class="ren-banner ren-banner-success" role="status">
       <span class="ren-banner-icon">✓</span>
       <p class="ren-banner-message">File uploaded successfully.</p>
     </div>
   ============================================ */

/* ─── Base Banner ─── */
.ren-banner {
  display: flex;
  align-items: flex-start;
  gap: var(--ren-banner-gap);
  padding: var(--ren-banner-padding);
  border-radius: var(--ren-banner-radius);
  font-size: var(--body-size);
  line-height: var(--leading-normal);
  /* Default: info */
  background-color: var(--ren-banner-bg);
  border: var(--ren-banner-border-width) solid var(--ren-banner-border-color);
  color: var(--ren-banner-color);
}

/* ─── Icon ─── */
.ren-banner-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: var(--ren-banner-icon-size);
  height: var(--ren-banner-icon-size);
  font-size: var(--text-base);
  margin-top: 1px;
}

/* ─── Content ─── */
.ren-banner-content {
  flex: 1;
  min-width: 0;
}

.ren-banner-title {
  display: block;
  font-weight: var(--weight-semibold);
  font-size: var(--label-size, var(--text-sm));
  margin: 0 0 var(--space-1);
}

.ren-banner-message {
  font-size: var(--caption-size, var(--text-sm));
  color: var(--color-text-secondary);
  margin: 0;
}

/* Title-only (no message) */
.ren-banner-title:last-child {
  margin-bottom: 0;
}

/* ─── Actions (buttons inside banner) ─── */
.ren-banner-actions {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

/* ─── Dismiss button ─── */
.ren-banner-dismiss {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  padding: 0;
  border: none;
  background: none;
  color: var(--color-text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  font-size: var(--text-lg);
  line-height: 1;
  transition: color var(--duration-tactile) var(--ease-enter);
}

.ren-banner-dismiss:hover {
  color: var(--color-text);
}

.ren-banner-dismiss:focus-visible {
  outline: var(--ring-width) solid var(--color-focus-ring);
  outline-offset: 2px;
}

/* ─── Variants ─── */

.ren-banner-success {
  background-color: var(--color-success-subtle);
  border-color: color-mix(in oklch, var(--color-success), transparent 70%);
}

.ren-banner-warning {
  background-color: var(--color-warning-subtle);
  border-color: color-mix(in oklch, var(--color-warning), transparent 70%);
}

.ren-banner-danger {
  background-color: var(--color-danger-subtle);
  border-color: color-mix(in oklch, var(--color-danger), transparent 70%);
}

.ren-banner-neutral {
  background-color: var(--color-surface-sunken);
  border-color: var(--color-border);
}

/* ─── Compact variant (less padding, single line) ─── */
.ren-banner-compact {
  align-items: center;
  padding: var(--space-2) var(--space-3);
  gap: var(--space-2);
}

.ren-banner-compact .ren-banner-icon {
  width: 1.25rem;
  height: 1.25rem;
  font-size: var(--text-sm);
}

/* ─── Full-width variant (no border-radius, for page top) ─── */
.ren-banner-full {
  border-radius: 0;
  border-inline-start: none;
  border-inline-end: none;
}

/* ─── Dismiss animation ─── */
.ren-banner[data-dismissing] {
  animation: ren-banner-dismiss var(--duration-state) var(--ease-enter) forwards;
}

@keyframes ren-banner-dismiss {
  to {
    opacity: 0;
    height: 0;
    padding-block: 0;
    margin-block: 0;
    overflow: hidden;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .ren-banner[data-dismissing] {
    animation: none;
    display: none;
  }
}