/* ==========================================================================
   I {💔} JSON — Pro Developer Toolkit
   Modern, Clean, Cohesive Design System
   ========================================================================== */

:root {
  color-scheme: light;

  /* Bracket Pair Depths (Harmonious & Readable) */
  --bracket-depth-1: #d97706;
  --bracket-depth-2: #8b5cf6;
  --bracket-depth-3: #0284c7;
  --bracket-depth-4: #059669;
  --bracket-depth-5: #d97706;
  --bracket-depth-6: #8b5cf6;

  /* Surfaces & Ink (Clean Studio Palette) */
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-soft: #f1f5f9;
  --surface-card: #ffffff;
  --surface-elevated: #ffffff;
  --ink: #0f172a;
  --ink-secondary: #334155;
  --muted: #64748b;
  --line: #e2e8f0;
  --line-strong: #cbd5e1;

  /* 5 Distinct Tool Colors (Light Theme) */
  --tool-formatter: #d97706; /* Amber */
  --tool-formatter-hover: #b45309;
  --tool-formatter-glow: rgba(217, 119, 6, 0.2);

  --tool-differ: #7c3aed; /* Violet / Purple */
  --tool-differ-hover: #6d28d9;
  --tool-differ-glow: rgba(124, 58, 237, 0.2);

  --tool-tree: #0284c7; /* Cyan / Sky Blue */
  --tool-tree-hover: #0369a1;
  --tool-tree-glow: rgba(2, 132, 199, 0.2);

  --tool-extract: #059669; /* Emerald */
  --tool-extract-hover: #047857;
  --tool-extract-glow: rgba(5, 150, 105, 0.2);

  --tool-curl: #e11d48; /* Rose */
  --tool-curl-hover: #be123c;
  --tool-curl-glow: rgba(225, 29, 72, 0.2);

  /* Unified Brand & Semantic Accents */
  --brand: #0284c7;
  --brand-strong: #0369a1;
  --brand-glow: rgba(2, 132, 199, 0.12);
  --brand-bg: rgba(2, 132, 199, 0.06);

  --danger: #e11d48;
  --danger-bg: #fff1f2;
  --success: #059669;
  --success-bg: #ecfdf5;

  --field-bg: #ffffff;
  --button-soft: #f1f5f9;
  --button-soft-hover: #e2e8f0;

  --editor-gutter: #f8fafc;
  --editor-line: #e2e8f0;
  --diff-add-bg: rgba(5, 150, 105, 0.08);
  --diff-add-border: #059669;
  --diff-remove-bg: rgba(225, 29, 72, 0.08);
  --diff-remove-border: #e11d48;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 12px -2px rgba(15, 23, 42, 0.06), 0 2px 4px -1px rgba(15, 23, 42, 0.03);
  --shadow-lg: 0 16px 36px -12px rgba(15, 23, 42, 0.08), 0 0 0 1px rgba(15, 23, 42, 0.04);
  --shadow: var(--shadow-lg);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}

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

  /* Bracket Pair Depths (Dark Mode) */
  --bracket-depth-1: #fbbf24;
  --bracket-depth-2: #a78bfa;
  --bracket-depth-3: #38bdf8;
  --bracket-depth-4: #34d399;
  --bracket-depth-5: #fbbf24;
  --bracket-depth-6: #a78bfa;

  /* Dark Theme Obsidian Surfaces */
  --bg: #0b0f19;
  --surface: #111827;
  --surface-soft: #172133;
  --surface-card: #131c2d;
  --surface-elevated: #1a253a;
  --ink: #f3f4f6;
  --ink-secondary: #cbd5e1;
  --muted: #8292a8;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.16);

  /* 5 Distinct Tool Colors (Dark Theme) */
  --tool-formatter: #f59e0b;
  --tool-formatter-hover: #d97706;
  --tool-formatter-glow: rgba(245, 158, 11, 0.28);

  --tool-differ: #a855f7;
  --tool-differ-hover: #9333ea;
  --tool-differ-glow: rgba(168, 85, 247, 0.28);

  --tool-tree: #38bdf8;
  --tool-tree-hover: #0284c7;
  --tool-tree-glow: rgba(56, 189, 248, 0.28);

  --tool-extract: #34d399;
  --tool-extract-hover: #059669;
  --tool-extract-glow: rgba(52, 211, 153, 0.28);

  --tool-curl: #fb7185;
  --tool-curl-hover: #e11d48;
  --tool-curl-glow: rgba(251, 113, 133, 0.28);

  --brand: #38bdf8;
  --brand-strong: #0ea5e9;
  --brand-glow: rgba(56, 189, 248, 0.18);
  --brand-bg: rgba(56, 189, 248, 0.08);

  --danger: #fb7185;
  --danger-bg: rgba(251, 113, 133, 0.12);
  --success: #34d399;
  --success-bg: rgba(52, 211, 153, 0.12);

  --field-bg: #0d121c;
  --button-soft: #182236;
  --button-soft-hover: #212f49;

  --editor-gutter: #0d131f;
  --editor-line: rgba(255, 255, 255, 0.07);
  --diff-add-bg: rgba(52, 211, 153, 0.12);
  --diff-add-border: #34d399;
  --diff-remove-bg: rgba(251, 113, 133, 0.12);
  --diff-remove-border: #fb7185;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 45px -10px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.06);
  --shadow: var(--shadow-lg);
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  background-color: var(--bg);
  color: var(--ink);
  font-family: "Plus Jakarta Sans", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-feature-settings: "cv02", "cv03", "cv04", "cv11";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
  overflow-x: hidden;
  transition: background-color 0.25s ease, color 0.25s ease;
}

/* Subtle Monochromatic Ambient Highlight */
.ambient-glow {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 400px;
  pointer-events: none;
  z-index: 0;
  background: radial-gradient(circle at 50% 0%, var(--brand-glow) 0%, transparent 70%);
  filter: blur(80px);
  opacity: 0.65;
  transition: opacity 0.3s ease;
}

[data-theme="dark"] .ambient-glow {
  opacity: 0.85;
}

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

/* ==========================================================================
   App Shell & Topbar Header
   ========================================================================== */

.app-shell {
  position: relative;
  z-index: 1;
  width: min(1240px, calc(100% - 36px));
  margin: 0 auto;
  padding: 18px 0 40px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  transition: opacity 0.15s ease;
  flex-shrink: 0;
}

.brand-link:hover {
  opacity: 0.88;
}

.brand-logo {
  display: block;
  width: 175px;
  height: auto;
  filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.05));
}

[data-theme="dark"] .brand-logo {
  filter: drop-shadow(0 2px 10px rgba(56, 189, 248, 0.16));
}

/* Subtle, tasteful tagline between logo and theme switch */
.topbar-tagline {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: -0.01em;
  text-align: center;
  white-space: nowrap;
}

.topbar-tagline .tagline-highlight {
  color: var(--ink);
  font-weight: 700;
}

/* Clean Theme Toggle */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.84rem;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.16s ease, box-shadow 0.16s ease;
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-md);
}

.theme-toggle-track {
  position: relative;
  width: 34px;
  height: 18px;
  border-radius: 999px;
  background: var(--surface-soft);
  border: 1px solid var(--line);
  transition: background 0.2s ease;
}

.theme-toggle-thumb {
  position: absolute;
  top: 1px;
  left: 1px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.18);
  transition: transform 0.22s cubic-bezier(0.34, 1.56, 0.64, 1);
}

[data-theme="dark"] .theme-toggle-thumb {
  transform: translateX(16px);
}

/* ==========================================================================
   Tool Grid Cards (Uniform, Clean & Consistent)
   ========================================================================== */

.tool-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

/* 5 Tool Card Color Bindings */
.tool-card[data-tool="formatter"] {
  --this-tool-color: var(--tool-formatter);
  --this-tool-hover: var(--tool-formatter-hover);
  --this-tool-glow: var(--tool-formatter-glow);
}

.tool-card[data-tool="differ"] {
  --this-tool-color: var(--tool-differ);
  --this-tool-hover: var(--tool-differ-hover);
  --this-tool-glow: var(--tool-differ-glow);
}

.tool-card[data-tool="tree"] {
  --this-tool-color: var(--tool-tree);
  --this-tool-hover: var(--tool-tree-hover);
  --this-tool-glow: var(--tool-tree-glow);
}

.tool-card[data-tool="extract"] {
  --this-tool-color: var(--tool-extract);
  --this-tool-hover: var(--tool-extract-hover);
  --this-tool-glow: var(--tool-extract-glow);
}

.tool-card[data-tool="curl"] {
  --this-tool-color: var(--tool-curl);
  --this-tool-hover: var(--tool-curl-hover);
  --this-tool-glow: var(--tool-curl-glow);
}

.tool-card {
  position: relative;
  min-height: 86px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 13px 15px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  text-align: left;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: 4px;
}

.tool-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--this-tool-color);
  opacity: 0.55;
  transition: opacity 0.18s ease;
}

.tool-card:hover {
  transform: translateY(-2px);
  border-color: var(--this-tool-color);
  box-shadow: 0 4px 16px -2px var(--this-tool-glow);
}

.tool-card:hover::before {
  opacity: 1;
}

.tool-card.active {
  border-color: var(--this-tool-color);
  background: var(--surface);
  box-shadow: 0 0 0 1px var(--this-tool-color), 0 4px 18px -2px var(--this-tool-glow);
}

.tool-card.active::before {
  opacity: 1;
  height: 3px;
  background: var(--this-tool-color);
}

.tool-name {
  font-weight: 750;
  font-size: 0.94rem;
  color: var(--ink);
  letter-spacing: -0.01em;
  transition: color 0.16s ease;
}

.tool-card:hover .tool-name,
.tool-card.active .tool-name {
  color: var(--this-tool-color);
}

.tool-card small {
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.38;
  display: block;
}

/* ==========================================================================
   Workspace Shell
   ========================================================================== */

/* Active Tool Palette Bindings on Workspace */
.workspace[data-active-tool="formatter"] {
  --active-tool-color: var(--tool-formatter);
  --active-tool-hover: var(--tool-formatter-hover);
  --active-tool-glow: var(--tool-formatter-glow);
}

.workspace[data-active-tool="differ"] {
  --active-tool-color: var(--tool-differ);
  --active-tool-hover: var(--tool-differ-hover);
  --active-tool-glow: var(--tool-differ-glow);
}

.workspace[data-active-tool="tree"] {
  --active-tool-color: var(--tool-tree);
  --active-tool-hover: var(--tool-tree-hover);
  --active-tool-glow: var(--tool-tree-glow);
}

.workspace[data-active-tool="extract"] {
  --active-tool-color: var(--tool-extract);
  --active-tool-hover: var(--tool-extract-hover);
  --active-tool-glow: var(--tool-extract-glow);
}

.workspace[data-active-tool="curl"] {
  --active-tool-color: var(--tool-curl);
  --active-tool-hover: var(--tool-curl-hover);
  --active-tool-glow: var(--tool-curl-glow);
}

.workspace {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

/* Compact header with description removed for shortened vertical footprint */
.workspace-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid var(--line);
  padding: 10px 18px;
  background: var(--surface);
  min-height: 52px;
}

#toolTitle {
  font-size: 1.15rem;
  font-weight: 750;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin: 0;
}

#toolDescription {
  display: none;
}

/* Action Buttons */
.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

button {
  min-height: 34px;
  border-radius: var(--radius-sm);
  padding: 0 13px;
  font-size: 0.84rem;
  font-weight: 650;
  transition: all 0.16s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Primary Action Button - matches active tool color */
.actions button:not(.secondary):not(.ghost),
.primary-btn {
  cursor: pointer;
  border: 1px solid transparent;
  color: #ffffff;
  background: var(--active-tool-color, var(--brand));
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 2px 8px var(--active-tool-glow, var(--brand-glow));
}

.actions button:not(.secondary):not(.ghost):hover,
.primary-btn:hover {
  background: var(--active-tool-hover, var(--brand-strong));
  box-shadow: 0 3px 12px var(--active-tool-glow, var(--brand-glow));
  transform: translateY(-1px);
}

/* Secondary Actions */
.actions button.secondary {
  cursor: pointer;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
}

.actions button.secondary:hover {
  border-color: var(--line-strong);
  background: var(--surface-soft);
  transform: translateY(-1px);
}

/* Ghost / Clear Action */
.actions button.ghost {
  cursor: pointer;
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
}

.actions button.ghost:hover {
  color: var(--danger);
  background: var(--danger-bg);
}

/* Grayed Out / Disabled Action (Share everywhere) */
.actions button.action-disabled,
.actions button[data-action="share"],
.actions button:disabled {
  opacity: 0.38 !important;
  cursor: not-allowed !important;
  pointer-events: none !important;
  filter: grayscale(1) !important;
  background: var(--surface-soft) !important;
  color: var(--muted) !important;
  border-color: var(--line) !important;
  box-shadow: none !important;
  transform: none !important;
}

/* ==========================================================================
   Tool Panels & Panes
   ========================================================================== */

.tool-panel {
  display: none;
  padding: 16px;
}

.tool-panel.active {
  display: block;
  animation: fadeInPanel 0.2s ease forwards;
}

@keyframes fadeInPanel {
  from {
    opacity: 0;
    transform: translateY(3px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.editor-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 16px;
}

.editor-result-layout,
.split-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.editor-panel,
.summary-panel,
.result-panel {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.editor-panel:focus-within,
.result-panel:focus-within {
  border-color: var(--active-tool-color, var(--brand));
  box-shadow: 0 0 0 1px var(--active-tool-color, var(--brand));
}

.editor-panel,
.result-panel {
  display: grid;
  grid-template-rows: auto 1fr;
}

/* IDE Chrome Panel Header */
.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid var(--line);
  padding: 9px 13px;
  background: var(--surface-soft);
}

.panel-title-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.window-controls {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.ctrl-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  display: inline-block;
  opacity: 0.8;
}

.ctrl-dot.close { background-color: #ff5f56; }
.ctrl-dot.min { background-color: #ffbd2e; }
.ctrl-dot.max { background-color: #27c93f; }

.panel-header h3 {
  margin: 0;
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
}

label {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 600;
}

select,
input {
  min-height: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0 9px;
  background: var(--surface);
  color: var(--ink);
  font-size: 0.84rem;
  font-weight: 550;
  outline: 0;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

select:focus,
input:focus {
  border-color: var(--active-tool-color, var(--brand));
  box-shadow: 0 0 0 2px var(--active-tool-glow, var(--brand-glow));
}

/* ==========================================================================
   Code Editor & Semantic Triangle Arrows Gutter
   ========================================================================== */

textarea {
  width: 100%;
  min-height: 440px;
  resize: vertical;
  border: 0;
  outline: 0;
  padding: 16px 16px 16px 14px;
  background: var(--field-bg);
  color: var(--ink);
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.92rem;
  line-height: 1.6;
  tab-size: 2;
  white-space: pre-wrap;
  word-break: break-all;
  overflow-wrap: anywhere;
  overflow-x: hidden;
  overflow-y: auto;
}

.code-editor {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  min-height: 440px;
  background: var(--field-bg);
  overflow: hidden;
  transition: outline 0.15s ease, background-color 0.15s ease;
}

.code-editor.editor-drag-over {
  outline: 2px dashed var(--active-tool-color, var(--brand));
  outline-offset: -2px;
  background: color-mix(in srgb, var(--active-tool-color, var(--brand)) 7%, var(--field-bg));
}

.line-gutter {
  position: relative;
  z-index: 3;
  min-width: 62px;
  min-height: 440px;
  overflow: hidden;
  border-right: 1px solid var(--editor-line);
  background: var(--editor-gutter);
  color: var(--muted);
  padding: 16px 6px;
  user-select: none;
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.92rem;
  line-height: 1.6;
}

.line-gutter > span {
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
  line-height: 1.472rem;
  padding: 0 3px;
  border-radius: 3px;
  gap: 5px;
  box-sizing: border-box;
  transition: background-color 0.15s ease;
}

.line-gutter > span.added {
  background: var(--diff-add-bg);
  color: var(--diff-add-border);
  font-weight: 750;
}

.line-gutter > span.removed {
  background: var(--diff-remove-bg);
  color: var(--diff-remove-border);
  font-weight: 750;
}

.gutter-num {
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  text-align: right;
  flex: 1;
  opacity: 0.75;
}

.gutter-arrow-slot {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  gap: 2px;
}

.gutter-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  border-radius: 3px;
  color: inherit;
  transition: transform 0.16s ease, filter 0.16s ease, background-color 0.16s ease;
}

.gutter-arrow:hover {
  transform: scale(1.3);
  filter: drop-shadow(0 0 4px currentColor);
  background-color: color-mix(in srgb, currentColor 20%, transparent);
}

.gutter-arrow.active-partner {
  transform: scale(1.3);
  filter: drop-shadow(0 0 5px currentColor);
  background-color: color-mix(in srgb, currentColor 24%, transparent);
  animation: pulsePartner 1s ease-in-out infinite alternate;
}

.gutter-arrow.unclosed {
  cursor: default;
  opacity: 0.75;
}

.gutter-arrow-svg {
  display: block;
}

.gutter-pulse {
  animation: pulseGutterLine 0.9s cubic-bezier(0.2, 0.8, 0.2, 1);
}

@keyframes pulsePartner {
  0% { transform: scale(1.15); filter: drop-shadow(0 0 2px currentColor); }
  100% { transform: scale(1.35); filter: drop-shadow(0 0 6px currentColor); }
}

@keyframes pulseGutterLine {
  0% { background-color: color-mix(in srgb, var(--brand) 30%, transparent); }
  50% { background-color: color-mix(in srgb, var(--brand) 15%, transparent); }
  100% { background-color: transparent; }
}

/* Bracket Block Range Highlight */
.curly-block-highlight {
  position: absolute;
  left: 0;
  right: 0;
  border-left: 3px solid;
  border-radius: 0 4px 4px 0;
  pointer-events: none;
  z-index: 1;
  transition: opacity 0.18s ease;
}

.line-highlights {
  position: relative;
  z-index: 1;
  grid-column: 2;
  grid-row: 1;
  padding-top: 16px;
  pointer-events: none;
  will-change: transform;
}

.line-highlight {
  position: absolute;
  left: 0;
  right: 0;
  height: 1.472rem;
  border-left: 3px solid transparent;
}

.line-highlight.added {
  border-left-color: var(--diff-add-border);
  background: var(--diff-add-bg);
}

.line-highlight.removed {
  border-left-color: var(--diff-remove-border);
  background: var(--diff-remove-bg);
}

.diff-render {
  display: none;
  position: relative;
  z-index: 4;
  grid-column: 2;
  grid-row: 1;
  min-height: 440px;
  padding: 16px 0;
  overflow-x: hidden;
  overflow-y: hidden;
  pointer-events: none;
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.92rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-all;
  overflow-wrap: anywhere;
  will-change: transform;
}

.diff-mode .diff-render {
  display: block;
}

.diff-mode textarea {
  color: transparent;
  caret-color: transparent;
}

.diff-render-row {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  min-height: 1.472rem;
  padding-right: 16px;
  white-space: pre-wrap;
  word-break: break-all;
  overflow-wrap: anywhere;
}

.diff-render-row.added {
  background: var(--diff-add-bg);
  color: var(--ink);
}

.diff-render-row.removed {
  background: var(--diff-remove-bg);
  color: var(--ink);
}

.diff-render-marker {
  color: var(--muted);
  font-weight: 750;
  text-align: center;
  user-select: none;
}

.diff-render-row.added .diff-render-marker {
  color: var(--diff-add-border);
}

.diff-render-row.removed .diff-render-marker {
  color: var(--diff-remove-border);
}

.code-editor textarea {
  position: relative;
  z-index: 2;
  grid-column: 2;
  grid-row: 1;
  min-height: 440px;
  background: transparent;
  box-shadow: inset 0 0 0 9999px rgba(255, 255, 255, 0);
  white-space: pre-wrap;
  word-break: break-all;
  overflow-wrap: anywhere;
  overflow-x: hidden;
  overflow-y: auto;
}

textarea::placeholder {
  color: var(--muted);
  opacity: 0.65;
}

/* ==========================================================================
   Summary Panel: Status Card & Metric Badges
   ========================================================================== */

.summary-panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 14px;
  background: var(--surface-soft);
}

.status-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  background: var(--surface);
  transition: all 0.2s ease;
}

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

.status-pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--muted);
  display: inline-block;
}

.status-card span#statusLabel {
  font-weight: 750;
  font-size: 0.9rem;
}

.status-card p {
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.4;
  margin: 0;
}

/* Valid JSON -> Semantic Success */
.status-card.valid {
  border-color: color-mix(in srgb, var(--success) 35%, var(--line));
  background: var(--success-bg);
}

.status-card.valid .status-pulse-dot {
  background: var(--success);
  box-shadow: 0 0 8px rgba(5, 150, 105, 0.4);
}

.status-card.valid span#statusLabel {
  color: var(--success);
}

/* Invalid JSON -> Semantic Danger */
.status-card.invalid {
  border-color: color-mix(in srgb, var(--danger) 35%, var(--line));
  background: var(--danger-bg);
}

.status-card.invalid .status-pulse-dot {
  background: var(--danger);
  box-shadow: 0 0 8px rgba(225, 29, 72, 0.4);
}

.status-card.invalid span#statusLabel {
  color: var(--danger);
}

.status-card.neutral {
  border-color: var(--line);
}

.status-card.neutral .status-pulse-dot {
  background: var(--brand);
}

/* Stats Cards (Unified, Clean Typography) */
.stats {
  display: grid;
  gap: 8px;
  margin: 0;
}

.stat-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 13px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  transition: border-color 0.15s ease;
}

.stat-card:hover {
  border-color: var(--line-strong);
}

.stat-card dt {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
}

.stat-card dd {
  margin: 0;
  font-size: 0.98rem;
  font-weight: 750;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

/* ==========================================================================
   Output Panes: Tree Viewer, Extract, and cURL
   ========================================================================== */

.result-box,
.tree-output {
  min-height: 240px;
  max-height: 540px;
  margin: 0;
  overflow-x: hidden;
  overflow-y: auto;
  background: var(--field-bg);
  color: var(--ink);
  padding: 16px;
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.9rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-all;
  overflow-wrap: anywhere;
}

.result-box.fill {
  min-height: 440px;
  white-space: pre-wrap;
  word-break: break-all;
  overflow-wrap: anywhere;
}

/* Tree Viewer */
.tree-output {
  white-space: normal;
}

.tree-output details {
  margin: 2px 0;
}

.tree-output summary {
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  user-select: none;
  transition: background 0.12s ease;
}

.tree-output summary:hover {
  background: var(--surface-soft);
}

.tree-key {
  font-weight: 700;
  color: var(--ink);
}

.tree-badge {
  font-size: 0.78rem;
  font-weight: 750;
  opacity: 0.85;
}

.tree-output ul {
  margin: 3px 0 3px 16px;
  padding: 0 0 0 10px;
  list-style: none;
  border-left: 1.5px solid var(--line);
  transition: border-color 0.2s ease;
}

.tree-output li {
  margin: 2px 0;
}

.tree-output li.tree-load-more {
  margin: 6px 0;
  list-style: none;
}

.tree-batch-btn {
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 650;
  padding: 3px 11px;
  border-radius: var(--radius-sm);
  border: 1px dashed var(--line-strong);
  background: var(--surface);
  color: var(--active-tool-color, var(--brand));
  cursor: pointer;
  transition: all 0.16s ease;
}

.tree-batch-btn:hover {
  background: var(--surface-soft);
  border-color: var(--active-tool-color, var(--brand));
  transform: translateY(-1px);
}

.json-key {
  color: var(--brand);
  font-weight: 700;
}

.json-colon {
  color: var(--muted);
  margin-right: 4px;
}

.val-string {
  color: var(--success);
}

.val-number {
  color: #b45309;
}

[data-theme="dark"] .val-number {
  color: #f59e0b;
}

.val-boolean,
.val-null {
  color: var(--danger);
  font-weight: 600;
}

.val-primitive {
  color: var(--ink);
}

/* cURL Tool Options */
.curl-options {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 180px;
  gap: 12px;
  margin-bottom: 16px;
}

.curl-options label {
  align-items: stretch;
  flex-direction: column;
  gap: 5px;
}

.curl-options input,
.curl-options select {
  min-height: 36px;
  width: 100%;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

@media (max-width: 1024px) {
  .tool-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .editor-layout,
  .editor-result-layout,
  .split-layout {
    grid-template-columns: 1fr;
  }

  .summary-panel {
    order: -1;
  }
}

@media (max-width: 720px) {
  .topbar {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 12px;
  }

  .topbar-tagline {
    white-space: normal;
  }

  .tool-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .workspace-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }

  .actions {
    justify-content: flex-start;
    width: 100%;
  }

  .actions button {
    flex: 1 1 110px;
  }

  .curl-options {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 500px) {
  .app-shell {
    width: calc(100% - 24px);
    padding: 14px 0;
  }

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

/* ==========================================================================
   Footer & Client-Side Privacy Badge
   ========================================================================== */

.app-footer {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 22px;
  padding-bottom: 24px;
}

.privacy-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.81rem;
  font-weight: 550;
  box-shadow: var(--shadow-sm);
  transition: all 0.16s ease;
}

.privacy-badge svg {
  color: var(--success);
  flex-shrink: 0;
}

.privacy-badge:hover {
  border-color: var(--line-strong);
  color: var(--ink);
  transform: translateY(-1px);
}