/* ================================================================
   Relune Playground — Precision Instrument Theme
   ================================================================ */

/* --- Tokens ---------------------------------------------------- */
:root {
  color-scheme: light;

  /* Surfaces */
  --bg: #f5f0e8;
  --bg-dot: rgba(120, 53, 15, 0.07);
  --surface-0: #fffcf7;
  --surface-1: rgba(255, 252, 247, 0.92);
  --surface-2: rgba(255, 249, 240, 0.7);
  --border: rgba(120, 53, 15, 0.14);
  --border-strong: rgba(120, 53, 15, 0.28);
  --shadow: 0 1px 3px rgba(120, 53, 15, 0.06);
  --shadow-lg: 0 8px 32px rgba(120, 53, 15, 0.1);

  /* Text */
  --text: #1c1917;
  --text-secondary: #78716c;
  --text-tertiary: #a8a29e;

  /* Accent — amber family */
  --accent: #b45309;
  --accent-strong: #92400e;
  --accent-glow: rgba(217, 119, 6, 0.15);
  --accent-text: #fff;

  /* Semantic */
  --danger: #dc2626;
  --danger-bg: rgba(220, 38, 38, 0.08);
  --danger-border: rgba(220, 38, 38, 0.2);
  --warning: #d97706;
  --warning-bg: rgba(217, 119, 6, 0.08);
  --warning-border: rgba(217, 119, 6, 0.2);
  --info: #0d9488;
  --info-border: rgba(13, 148, 136, 0.2);
  --hint: #64748b;

  /* Editor */
  --editor-bg: #1c1510;
  --editor-text: #fef3c7;
  --editor-border: rgba(120, 53, 15, 0.3);

  /* Iframe */
  --iframe-bg: #fffdf8;

  /* Typography */
  --font-display: "DM Sans", system-ui, sans-serif;
  --font-body: "DM Sans", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Consolas", monospace;

  /* Geometry */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --sidebar-w: 380px;
  --topbar-h: 72px;
}

:root[data-theme="dark"] {
  color-scheme: dark;

  --bg: #0f0c0a;
  --bg-dot: rgba(251, 191, 36, 0.04);
  --surface-0: #1a1512;
  --surface-1: rgba(28, 22, 18, 0.92);
  --surface-2: rgba(38, 30, 24, 0.8);
  --border: rgba(251, 191, 36, 0.1);
  --border-strong: rgba(251, 191, 36, 0.22);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);

  --text: #f5f0e8;
  --text-secondary: #d6d3d1;
  --text-tertiary: #78716c;

  --accent: #f59e0b;
  --accent-strong: #fbbf24;
  --accent-glow: rgba(245, 158, 11, 0.12);
  --accent-text: #0f0c0a;

  --danger: #fca5a5;
  --danger-bg: rgba(220, 38, 38, 0.12);
  --danger-border: rgba(220, 38, 38, 0.25);
  --warning: #fcd34d;
  --warning-bg: rgba(217, 119, 6, 0.12);
  --warning-border: rgba(217, 119, 6, 0.25);
  --info: #5eead4;
  --info-border: rgba(94, 234, 212, 0.2);
  --hint: #94a3b8;

  --editor-bg: #0a0806;
  --editor-text: #fef3c7;
  --editor-border: rgba(251, 191, 36, 0.15);

  --iframe-bg: #111111;
}

/* --- Reset ----------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
}

html,
body {
  height: 100%;
}

body {
  background-color: var(--bg);
  background-image: radial-gradient(var(--bg-dot) 1px, transparent 1px);
  background-size: 20px 20px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

[hidden] {
  display: none !important;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

code,
textarea {
  font-family: var(--font-mono);
}

a {
  color: inherit;
  text-decoration: none;
}

/* --- App shell ------------------------------------------------- */
.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* --- Top bar --------------------------------------------------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--topbar-h);
  padding: 0 20px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-1);
  backdrop-filter: blur(12px);
  flex-shrink: 0;
  z-index: 10;
}

.topbar__brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.topbar__logo {
  border-radius: 8px;
  box-shadow:
    0 0 0 3px var(--accent-glow),
    var(--shadow);
  transition: box-shadow 200ms ease;
}

.topbar__logo:hover {
  box-shadow:
    0 0 0 5px var(--accent-glow),
    0 0 16px var(--accent-glow),
    var(--shadow);
}

.topbar__brand-text {
  display: flex;
  align-items: center;
  gap: 8px;
}

.topbar__tag {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.topbar__badge {
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--accent-glow);
  border: 1px solid var(--border);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
}

.topbar__right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.topbar__status {
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
}

.topbar__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  transition:
    color 120ms ease,
    background 120ms ease;
}

.topbar__link:hover {
  color: var(--text);
  background: var(--accent-glow);
}

.topbar__link svg {
  flex-shrink: 0;
}

/* --- Workspace ------------------------------------------------- */
.workspace {
  display: flex;
  flex: 1;
  min-height: 0;
}

/* --- Sidebar --------------------------------------------------- */
.sidebar {
  width: var(--sidebar-w);
  min-width: 0;
  min-height: 0;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  background: var(--surface-1);
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  transition: width 250ms cubic-bezier(0.4, 0, 0.2, 1);
  overflow-x: hidden;
  overflow-y: hidden;
}

.sidebar.is-collapsed {
  width: 0 !important;
  border-right-color: transparent;
}

/* Expand button — visible only when sidebar is collapsed */
.sidebar-expand {
  display: none;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  margin: 8px 0 0 6px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-0);
  color: var(--text-tertiary);
  cursor: pointer;
  align-self: flex-start;
  transition:
    color 120ms ease,
    background 120ms ease,
    border-color 120ms ease;
}

.sidebar-expand:hover {
  color: var(--accent);
  background: var(--accent-glow);
  border-color: var(--accent);
}

.sidebar.is-collapsed ~ .sidebar-expand {
  display: flex;
}

/* Drag-handle — sits between sidebar and preview */
.sidebar-handle {
  flex-shrink: 0;
  width: 12px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: col-resize;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 5;
  touch-action: none;
}

/* Wider invisible hit area */
.sidebar-handle::before {
  content: "";
  position: absolute;
  inset: 0 -6px;
}

.sidebar-handle__grip {
  display: block;
  width: 4px;
  height: 32px;
  border-radius: 999px;
  background: var(--border);
  transition:
    background 150ms ease,
    height 150ms ease,
    box-shadow 150ms ease;
}

.sidebar-handle:hover .sidebar-handle__grip,
.sidebar-handle:active .sidebar-handle__grip {
  height: 48px;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
}

/* Sidebar header with collapse button */
.sidebar__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.sidebar__label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

.sidebar__collapse {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-tertiary);
  cursor: pointer;
  transition:
    color 120ms ease,
    background 120ms ease,
    border-color 120ms ease;
}

.sidebar__collapse:hover {
  color: var(--text);
  background: var(--accent-glow);
  border-color: var(--border);
}

.sidebar__scroll {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar__scroll > * {
  flex-shrink: 0;
}

/* Scrollbar */
.sidebar__scroll::-webkit-scrollbar {
  width: 5px;
}

.sidebar__scroll::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar__scroll::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 999px;
}

/* --- Control sections ------------------------------------------ */
.ctrl-section {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-0);
  overflow: hidden;
  margin-bottom: 6px;
}

.ctrl-section__title {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
  list-style: none;
}

.ctrl-section__title::-webkit-details-marker {
  display: none;
}

.ctrl-section__title::before {
  content: "›";
  display: inline-block;
  margin-right: 6px;
  font-size: 14px;
  font-weight: 400;
  color: var(--text-tertiary);
  transition: transform 150ms ease;
}

details[open] > .ctrl-section__title::before {
  transform: rotate(90deg);
}

.ctrl-section__title--static {
  cursor: default;
}

.ctrl-section__title--static::before {
  content: none;
}

/* --- Control rows ---------------------------------------------- */
.ctrl-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 0 10px 10px;
}

.ctrl-row--actions {
  grid-template-columns: 1fr auto;
  padding: 10px;
  align-items: end;
}

.ctrl-row--stack {
  grid-template-columns: 1fr;
}

.ctrl-row--mode-tabs {
  padding-top: 0;
}

/* --- Individual control ---------------------------------------- */
.ctrl {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.ctrl__label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  padding-left: 2px;
}

.ctrl__hint {
  padding-left: 2px;
  color: var(--text-tertiary);
  font-size: 11px;
  line-height: 1.4;
}

.ctrl select,
.ctrl input {
  height: 32px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  font-size: 12px;
  transition:
    border-color 120ms ease,
    box-shadow 120ms ease;
}

.ctrl select:disabled,
.ctrl input:disabled {
  cursor: not-allowed;
  opacity: 0.65;
}

.ctrl select:focus,
.ctrl input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

/* --- Mode tabs ------------------------------------------------- */
.mode-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
}

.mode-tab {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 32px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  transition:
    border-color 120ms ease,
    background 120ms ease,
    color 120ms ease;
}

.mode-tab:hover {
  border-color: var(--border-strong);
  color: var(--text);
}

.mode-tab.is-active {
  border-color: var(--accent-strong);
  background: var(--accent);
  color: var(--accent-text);
}

.mode-hint {
  padding-top: 4px;
}

/* --- SQL editor ------------------------------------------------ */
.ctrl-section--editor {
  display: flex;
  flex-direction: column;
}

.ctrl-section--editor .ctrl-section__title {
  justify-content: space-between;
}

.editor-expand {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-tertiary);
  cursor: pointer;
  transition:
    color 120ms ease,
    background 120ms ease,
    border-color 120ms ease;
}

.editor-expand:hover {
  color: var(--text);
  background: var(--accent-glow);
  border-color: var(--border);
}

.editor-expand__icon--collapse {
  display: none;
}

.is-editor-expanded .editor-expand__icon--expand {
  display: none;
}

.is-editor-expanded .editor-expand__icon--collapse {
  display: block;
}

.ctrl-section--editor #sql-input {
  width: 100%;
  height: 320px;
  border: none;
  border-top: 1px solid var(--editor-border);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  overflow: hidden;
}

.ctrl-section--editor #compare-before-input,
.ctrl-section--editor #compare-after-input {
  width: 100%;
  height: 240px;
  border-top: 1px solid var(--editor-border);
  overflow: hidden;
}

.ctrl-section--editor .cm-editor {
  height: 100%;
}

.ctrl-section--editor .cm-editor.cm-focused {
  outline: none;
}

/* Editor expanded state */
.sidebar__scroll.is-editor-expanded > :not(.ctrl-section--editor) {
  display: none;
}

.sidebar__scroll.is-editor-expanded .ctrl-section--editor {
  flex: 1;
  min-height: 0;
}

.sidebar__scroll.is-editor-expanded .ctrl-section--editor #sql-input {
  height: auto;
  flex: 1;
  min-height: 0;
}

/* --- Sidebar actions ------------------------------------------- */
.sidebar__actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  padding: 0 0 6px;
}

.sidebar__note {
  padding: 0 2px 4px;
  color: var(--text-tertiary);
  font-size: 11px;
  line-height: 1.5;
}

/* --- Buttons --------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 32px;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-0);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition:
    background 120ms ease,
    border-color 120ms ease,
    transform 100ms ease;
}

.btn:hover {
  border-color: var(--border-strong);
  transform: translateY(-0.5px);
}

.btn:active {
  transform: translateY(0);
}

.btn--primary {
  background: var(--accent);
  border-color: var(--accent-strong);
  color: var(--accent-text);
  font-weight: 700;
  letter-spacing: 0.02em;
}

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

.btn--ghost {
  flex: 1;
  background: transparent;
  color: var(--text-secondary);
}

.btn--ghost:hover {
  background: var(--accent-glow);
  color: var(--text);
}

.btn:disabled {
  opacity: 0.4;
  pointer-events: none;
}

/* --- Preview (main area) --------------------------------------- */
.preview {
  flex: 1;
  min-width: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  padding: 12px;
  gap: 10px;
  overflow-y: auto;
}

.surface-head {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 2px 2px 0;
}

.surface-head__eyebrow {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.surface-head__title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.surface-head__description {
  max-width: 760px;
  color: var(--text-secondary);
  font-size: 14px;
}

.surface {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-0);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.surface__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}

.surface__label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.surface__meta {
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  font-size: 11px;
}

/* --- Error box ------------------------------------------------- */
.error-box {
  flex-shrink: 0;
  padding: 12px 14px;
  border: 1px solid var(--danger-border);
  border-radius: var(--radius-md);
  background: var(--danger-bg);
  font-size: 12px;
  max-height: 120px;
  overflow-y: auto;
}

.error-box strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--danger);
}

.error-box p {
  margin: 0;
  line-height: 1.5;
}

/* --- Stats ribbon ---------------------------------------------- */
.stats-ribbon {
  display: flex;
  flex-wrap: wrap;
  flex-shrink: 0;
  gap: 6px;
}

.stat-card {
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-0);
}

.stat-card__label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

.stat-card__value {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
}

/* --- Diagnostics ----------------------------------------------- */
.diagnostics {
  flex-shrink: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-0);
  overflow: hidden;
}

.diagnostics__header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  cursor: pointer;
  user-select: none;
  list-style: none;
}

.diagnostics__header::-webkit-details-marker {
  display: none;
}

/* Chevron indicator */
.diagnostics__label::before {
  content: "›";
  display: inline-block;
  margin-right: 4px;
  font-size: 18px;
  font-weight: 600;
  line-height: 1;
  color: var(--text-tertiary);
  transition: transform 150ms ease;
}

.diagnostics[open] .diagnostics__label::before {
  transform: rotate(90deg);
}

.diagnostics__label {
  display: inline-flex;
  align-items: center;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.diagnostics__count {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-tertiary);
  padding: 1px 7px;
  border-radius: var(--radius-sm);
  background: var(--accent-glow);
}

/* Hide the count background when 0 */
.diagnostics__count:empty {
  background: none;
}

.diagnostics__list {
  margin: 0;
  padding: 0;
  list-style: none;
  max-height: 160px;
  overflow-y: auto;
  border-top: 1px solid var(--border);
}

.diagnostic {
  padding: 8px 12px;
  font-size: 12px;
  line-height: 1.5;
  border-bottom: 1px solid var(--border);
}

.diagnostic:last-child {
  border-bottom: none;
}

.diagnostic--empty {
  color: var(--text-tertiary);
  font-style: italic;
}

.diagnostic--error {
  border-left: 3px solid var(--danger);
}

.diagnostic--warning {
  border-left: 3px solid var(--warning);
}

.diagnostic--info {
  border-left: 3px solid var(--info);
}

.diagnostic--hint {
  border-left: 3px solid var(--hint);
}

.diagnostic__meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.diagnostic p {
  margin: 0;
}

.pill {
  display: inline-block;
  padding: 1px 7px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.pill--error {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid var(--danger-border);
}

.pill--warning {
  background: var(--warning-bg);
  color: var(--warning);
  border: 1px solid var(--warning-border);
}

.pill--info {
  background: rgba(13, 148, 136, 0.08);
  color: var(--info);
  border: 1px solid var(--info-border);
}

.pill--hint {
  color: var(--hint);
  background: rgba(100, 116, 139, 0.08);
  border: 1px solid rgba(100, 116, 139, 0.15);
}

/* --- Viewport (preview iframe) --------------------------------- */
.viewport {
  flex: 1;
  min-height: 400px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--iframe-bg);
  box-shadow: var(--shadow-lg);
  position: relative;
}

.viewport::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius-md);
  pointer-events: none;
  z-index: 1;
  box-shadow: inset 0 0 0 1px var(--border);
}

.viewport iframe {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 400px;
  border: 0;
  background: var(--iframe-bg);
}

.code-output {
  margin: 0;
  padding: 14px;
  overflow: auto;
  color: var(--text);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), transparent);
  font-size: 12px;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
}

.inspect-grid {
  display: grid;
  grid-template-columns: minmax(240px, 320px) minmax(0, 1fr);
  min-height: 320px;
}

.inspect-list-wrap {
  border-right: 1px solid var(--border);
  background: var(--surface-1);
}

.inspect-table-list,
.issue-list,
.change-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.inspect-table-button {
  display: block;
  width: 100%;
  padding: 12px 14px;
  border: none;
  border-bottom: 1px solid var(--border);
  background: transparent;
  color: inherit;
  cursor: pointer;
  text-align: left;
  transition: background 120ms ease;
}

.inspect-table-button:hover,
.inspect-table-button.is-active {
  background: var(--accent-glow);
}

.inspect-table-name {
  display: block;
  font-weight: 700;
  margin-bottom: 3px;
}

.inspect-table-meta {
  color: var(--text-tertiary);
  font-size: 11px;
}

.inspect-detail {
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.detail-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-1);
  padding: 12px;
}

.detail-card h2,
.detail-card h3 {
  margin-bottom: 8px;
  font-size: 14px;
}

.detail-card p {
  color: var(--text-secondary);
  font-size: 12px;
  line-height: 1.6;
}

.detail-list {
  display: grid;
  gap: 8px;
}

.detail-item {
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: var(--surface-0);
  border: 1px solid var(--border);
}

.detail-item__title {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-bottom: 4px;
  font-weight: 700;
}

.detail-item__meta {
  color: var(--text-secondary);
  font-size: 12px;
}

.issue-list,
.change-list {
  display: grid;
  gap: 1px;
  background: var(--border);
  max-height: 280px;
  overflow-y: auto;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.issue-card,
.change-card {
  padding: 12px 14px;
  background: var(--surface-0);
}

.issue-card__meta,
.change-card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.issue-card__title,
.change-card__title {
  font-weight: 700;
}

.issue-card__body,
.change-card__body {
  color: var(--text-secondary);
  font-size: 12px;
  line-height: 1.6;
}

.issue-card__hint {
  margin-top: 6px;
  color: var(--text-tertiary);
  font-size: 11px;
}

/* --- Compare summary (collapsible) ----------------------------- */
.compare-summary {
  flex-shrink: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-0);
}

.compare-summary__header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  cursor: pointer;
  user-select: none;
  list-style: none;
}

.compare-summary__header::-webkit-details-marker {
  display: none;
}

.compare-summary__label {
  display: inline-flex;
  align-items: center;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.compare-summary__label::before {
  content: "›";
  display: inline-block;
  margin-right: 4px;
  font-size: 18px;
  font-weight: 600;
  line-height: 1;
  color: var(--text-tertiary);
  transition: transform 150ms ease;
}

.compare-summary[open] .compare-summary__label::before {
  transform: rotate(90deg);
}

.compare-summary__count {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-tertiary);
  padding: 1px 7px;
  border-radius: var(--radius-sm);
  background: var(--accent-glow);
}

.compare-summary__count:empty {
  background: none;
}

.change-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 14px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.compare-editors {
  display: grid;
  grid-template-columns: 1fr;
}

.compare-editors__pane + .compare-editors__pane {
  border-top: 1px solid var(--border);
}

.compare-editors__label {
  padding: 8px 12px;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--surface-2);
}

.ctrl-section--compare .compare-editors__pane:first-child .compare-editors__label {
  border-top: none;
}

.empty-state {
  color: var(--text-tertiary);
  font-style: italic;
}

/* --- Responsive ------------------------------------------------ */
@media (max-width: 900px) {
  .workspace {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border);
    max-height: 50vh;
  }

  .viewport {
    min-height: 300px;
  }

  .inspect-grid {
    grid-template-columns: 1fr;
  }

  .inspect-list-wrap {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .topbar__tag {
    display: none;
  }
}

@media (max-width: 560px) {
  .topbar__link:not(:first-child) {
    display: none;
  }

  .ctrl-row {
    grid-template-columns: 1fr;
  }

  .stats-ribbon {
    flex-direction: column;
  }

  .mode-tabs {
    grid-template-columns: 1fr 1fr;
  }
}

/* --- Animations ------------------------------------------------ */
@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.ctrl-section {
  animation: fade-in 300ms ease both;
}

.ctrl-section:nth-child(1) {
  animation-delay: 0ms;
}
.ctrl-section:nth-child(2) {
  animation-delay: 40ms;
}
.ctrl-section:nth-child(3) {
  animation-delay: 80ms;
}
.ctrl-section:nth-child(4) {
  animation-delay: 120ms;
}
.ctrl-section:nth-child(5) {
  animation-delay: 160ms;
}

.stat-card {
  animation: fade-in 200ms ease both;
}

.viewport {
  animation: fade-in 400ms ease 200ms both;
}