/* ==========================================================================
   Compare Viewer
   Side-by-side code comparison (e.g., React Native vs Swift/Kotlin)
   ========================================================================== */

/* ==========================================================================
   Container
   ========================================================================== */

.compare-container {
  margin: 24px 0;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
  background: var(--bg-card, #22223b);
  transition: var(--transition-colors, background-color 0.3s ease);
}

/* ==========================================================================
   Header & Tabs
   ========================================================================== */

.compare-header {
  display: flex;
  background: var(--bg-secondary, #282c34);
  border-bottom: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
}

.compare-tab {
  flex: 1;
  padding: 8px 16px;
  text-align: center;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted, #718096);
  border-bottom: 2px solid transparent;
  background: transparent;
  border-top: none;
  border-left: none;
  border-right: none;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
  user-select: none;
  -webkit-appearance: none;
  appearance: none;
  outline: none;
}

.compare-tab:hover {
  color: var(--text-secondary, #a0aec0);
  background: var(--bg-hover, rgba(255, 255, 255, 0.06));
}

.compare-tab.active {
  color: var(--accent, #61dafb);
  border-bottom-color: var(--accent, #61dafb);
}

.compare-tab:focus-visible {
  outline: 2px solid var(--accent, #61dafb);
  outline-offset: -2px;
}

/* Language label within tab */
.compare-tab-lang {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 1px 6px;
  border-radius: 3px;
  background: var(--accent-muted, rgba(97, 218, 251, 0.15));
  color: var(--accent, #61dafb);
  margin-left: 6px;
  vertical-align: middle;
}

/* ==========================================================================
   Panels (Side-by-Side)
   ========================================================================== */

.compare-panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 200px;
}

.compare-panel {
  padding: 16px;
  overflow-x: auto;
  font-family: var(--font-mono, 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace);
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-primary, #e0e0e0);
  background: var(--bg-code, #1e1e2e);
  white-space: pre;
  tab-size: 2;
}

.compare-panel-left {
  border-right: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
}

.compare-panel-right {
  /* No additional border needed */
}

/* Panel header label (visible above code in each panel) */
.compare-panel-label {
  display: block;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted, #718096);
  margin-bottom: 8px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  white-space: normal;
}

/* ==========================================================================
   Line Highlighting
   ========================================================================== */

.compare-line {
  display: block;
  padding: 0 4px;
  margin: 0 -4px;
  border-radius: 2px;
  transition: background-color 0.15s ease;
}

.compare-line:hover,
.compare-line-highlight {
  background: var(--bg-hover, rgba(255, 255, 255, 0.06));
}

.compare-line.added {
  background: var(--success-bg, rgba(78, 205, 196, 0.15));
}

.compare-line.removed {
  background: var(--error-bg, rgba(233, 69, 96, 0.15));
}

/* ==========================================================================
   Note / Footer
   ========================================================================== */

.compare-note {
  padding: 12px 16px;
  border-top: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
  font-size: 13px;
  font-style: italic;
  color: var(--text-muted, #718096);
  background: var(--bg-tertiary, #2d3748);
  line-height: 1.5;
}

.compare-note code {
  font-family: var(--font-mono, monospace);
  font-size: 12px;
  background: var(--bg-code, #1e1e2e);
  padding: 1px 5px;
  border-radius: 3px;
  font-style: normal;
}

/* ==========================================================================
   Mobile Responsive — Single Column with Tab Switching
   ========================================================================== */

@media (max-width: 768px) {
  .compare-panels {
    grid-template-columns: 1fr;
    min-height: 150px;
  }

  .compare-panel-left {
    border-right: none;
    border-bottom: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
  }

  /* On mobile, hide inactive panel when tabs control visibility */
  .compare-panel.hidden-mobile {
    display: none;
  }

  .compare-tab {
    padding: 8px 12px;
    font-size: 12px;
  }

  .compare-tab-lang {
    font-size: 9px;
  }

  .compare-panel {
    padding: 12px;
    font-size: 12px;
  }

  .compare-note {
    padding: 10px 12px;
    font-size: 12px;
  }
}