/* ==========================================================================
   Design System & Theme Variables
   ========================================================================== */

:root {
  /* Color Palette - Dark Theme (Default) */
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --bg-surface: rgba(22, 27, 34, 0.85);
  --bg-card: #1c2128;
  --bg-hover: rgba(255, 255, 255, 0.06);
  --bg-active: rgba(255, 255, 255, 0.1);
  --border-color: #30363d;
  --border-subtle: rgba(240, 246, 252, 0.1);
  --border-focus: #58a6ff;

  --text-primary: #f0f6fc;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --text-inverse: #0d1117;

  /* Accent & Status Colors */
  --accent-primary: #388bfd;
  --accent-hover: #58a6ff;
  --accent-gradient: linear-gradient(135deg, #388bfd 0%, #7928ca 100%);
  --success: #3fb950;
  --success-bg: rgba(63, 185, 80, 0.15);
  --warning: #d29922;
  --warning-bg: rgba(210, 153, 34, 0.15);
  --danger: #f85149;
  --danger-bg: rgba(248, 81, 73, 0.15);
  --info: #58a6ff;
  --info-bg: rgba(88, 166, 255, 0.15);

  /* JSON Syntax Highlighting Colors */
  --json-key: #7ee787;         /* Mint green */
  --json-string: #a5d6ff;      /* Sky blue */
  --json-number: #ff7b72;      /* Coral red */
  --json-boolean: #d2a8ff;     /* Lavender purple */
  --json-null: #ffa657;        /* Soft amber */
  --json-bracket: #8b949e;     /* Grey */
  --json-punctuation: #6e7681; /* Dim grey */
  --json-url: #58a6ff;         /* Bright link blue */

  /* Gutter & Editor */
  --gutter-bg: #12161c;
  --gutter-text: #484f58;
  --gutter-fold: #8b949e;
  --selection-bg: rgba(56, 139, 253, 0.35);

  /* Shadows & Glassmorphism */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(56, 139, 253, 0.3);
  --backdrop-blur: blur(16px);

  /* Dimensions & Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --header-height: 60px;
  --toolbar-height: 48px;
  --statusbar-height: 32px;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, Monaco, monospace;
}

[data-theme="light"] {
  --bg-primary: #f6f8fa;
  --bg-secondary: #ffffff;
  --bg-tertiary: #eaeef2;
  --bg-surface: rgba(255, 255, 255, 0.9);
  --bg-card: #ffffff;
  --bg-hover: rgba(0, 0, 0, 0.04);
  --bg-active: rgba(0, 0, 0, 0.08);
  --border-color: #d0d7de;
  --border-subtle: rgba(27, 31, 36, 0.15);
  --border-focus: #0969da;

  --text-primary: #1f2328;
  --text-secondary: #57606a;
  --text-muted: #8c959f;
  --text-inverse: #ffffff;

  --accent-primary: #0969da;
  --accent-hover: #218bff;
  --accent-gradient: linear-gradient(135deg, #0969da 0%, #8250df 100%);
  --success: #1a7f37;
  --success-bg: rgba(26, 127, 55, 0.1);
  --warning: #9a6700;
  --warning-bg: rgba(154, 103, 0, 0.1);
  --danger: #cf222e;
  --danger-bg: rgba(207, 34, 46, 0.1);
  --info: #0969da;
  --info-bg: rgba(9, 105, 218, 0.1);

  --json-key: #0550ae;
  --json-string: #0a3069;
  --json-number: #cf222e;
  --json-boolean: #8250df;
  --json-null: #953800;
  --json-bracket: #57606a;
  --json-punctuation: #8c959f;
  --json-url: #0969da;

  --gutter-bg: #f6f8fa;
  --gutter-text: #8c959f;
  --gutter-fold: #57606a;
  --selection-bg: rgba(9, 105, 218, 0.18);

  --shadow-sm: 0 1px 2px rgba(27, 31, 36, 0.06);
  --shadow-md: 0 4px 12px rgba(27, 31, 36, 0.08);
  --shadow-lg: 0 8px 24px rgba(27, 31, 36, 0.12);
  --shadow-glow: 0 0 20px rgba(9, 105, 218, 0.2);
}

/* ==========================================================================
   Base & Reset
   ========================================================================== */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html, body {
  height: 100%;
  width: 100%;
  overflow: hidden;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14px;
}

/* ==========================================================================
   App Layout
   ========================================================================== */

.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

/* Header */
.app-header {
  height: var(--header-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  z-index: 10;
}

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

.logo-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-family: var(--font-mono);
  box-shadow: var(--shadow-sm);
}

.logo-text {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, var(--text-primary), var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 12px;
  background: var(--bg-tertiary);
  color: var(--accent-hover);
  border: 1px solid var(--border-color);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Toolbar */
.app-toolbar {
  height: var(--toolbar-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  gap: 12px;
  overflow-x: auto;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.toolbar-divider {
  width: 1px;
  height: 22px;
  background-color: var(--border-color);
  margin: 0 4px;
}

/* Main Workspace */
.app-workspace {
  flex: 1;
  display: flex;
  position: relative;
  overflow: hidden;
  background-color: var(--bg-primary);
}

.editor-pane, .viewer-pane {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-width: 280px;
  position: relative;
}

.editor-pane {
  width: 45%;
}

.viewer-pane {
  flex: 1;
}

/* Splitter / Resizer */
.pane-splitter {
  width: 8px;
  height: 100%;
  background: transparent;
  cursor: col-resize;
  position: relative;
  z-index: 5;
  transition: background-color 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pane-splitter::after {
  content: '';
  width: 2px;
  height: 100%;
  background-color: var(--border-color);
  transition: background-color 0.2s;
}

.pane-splitter:hover::after,
.pane-splitter.active::after {
  background-color: var(--accent-primary);
  box-shadow: 0 0 8px var(--accent-primary);
}

/* Pane Header */
.pane-header {
  height: 40px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
}

.pane-title {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
}

.pane-tools {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Status Banner */
.error-banner {
  display: none;
  background: var(--danger-bg);
  color: var(--danger);
  border-bottom: 1px solid rgba(248, 81, 73, 0.4);
  padding: 8px 14px;
  font-size: 12px;
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  justify-content: space-between;
  animation: slideDown 0.2s ease-out;
}

.error-banner.hidden {
  display: none !important;
}

.error-msg {
  display: flex;
  align-items: center;
  gap: 8px;
  word-break: break-all;
}

/* Status Bar */
.app-statusbar {
  height: var(--statusbar-height);
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  font-size: 12px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.status-left, .status-right, .status-center {
  display: flex;
  align-items: center;
  gap: 16px;
}

.status-center {
  font-size: 12px;
  color: var(--text-muted);
}

.footer-author-link {
  color: var(--accent-hover);
  text-decoration: none;
  font-weight: 500;
  transition: opacity 0.15s, color 0.15s;
}

.footer-author-link:hover {
  text-decoration: underline;
  color: var(--text-primary);
}

.status-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--text-muted);
}

.status-indicator.valid {
  background-color: var(--success);
  box-shadow: 0 0 6px var(--success);
}

.status-indicator.invalid {
  background-color: var(--danger);
  box-shadow: 0 0 6px var(--danger);
}

/* ==========================================================================
   Buttons & Form Controls
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 32px;
  padding: 0 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
  white-space: nowrap;
}

.btn:hover {
  background: var(--bg-hover);
  border-color: var(--text-muted);
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #ffffff;
}

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

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

.btn-ghost:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn-sm {
  height: 26px;
  padding: 0 8px;
  font-size: 12px;
}

.btn-icon-only {
  width: 32px;
  padding: 0;
}

.btn-icon-only.btn-sm {
  width: 26px;
}

.btn-group {
  display: inline-flex;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.btn-group .btn {
  border-radius: 0;
  border: none;
  border-right: 1px solid var(--border-color);
}

.btn-group .btn:last-child {
  border-right: none;
}

.select-ctrl {
  height: 32px;
  padding: 0 10px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  font-size: 12px;
  cursor: pointer;
  outline: none;
}

.select-ctrl:hover, .select-ctrl:focus {
  border-color: var(--border-focus);
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0 8px;
  height: 26px;
  width: 180px;
  transition: width 0.2s, border-color 0.2s;
}

.search-box:focus-within {
  border-color: var(--border-focus);
  width: 240px;
}

.search-box input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 12px;
  width: 100%;
  margin-left: 6px;
}

.search-box input::placeholder {
  color: var(--text-muted);
}

/* ==========================================================================
   Editor & Viewer Panes
   ========================================================================== */

.editor-container {
  flex: 1;
  position: relative;
  display: flex;
  overflow: hidden;
  background: var(--bg-primary);
}

.raw-textarea {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  padding: 12px;
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 20px;
  border: none;
  outline: none;
  resize: none;
  white-space: pre;
  tab-size: 2;
  overflow: auto;
}

.drag-overlay {
  position: absolute;
  inset: 0;
  background: rgba(56, 139, 253, 0.15);
  border: 2px dashed var(--accent-primary);
  backdrop-filter: blur(4px);
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  z-index: 20;
  color: var(--text-primary);
  pointer-events: none;
}

.drag-overlay.active {
  display: flex;
}

/* ==========================================================================
   Code Output & Highlighter (Code View)
   ========================================================================== */

.code-viewer-container {
  flex: 1;
  display: flex;
  overflow: auto;
  position: relative;
  background: var(--bg-primary);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 22px;
}

.code-gutter {
  min-width: 50px;
  background: var(--gutter-bg);
  border-right: 1px solid var(--border-color);
  user-select: none;
  padding: 12px 0;
  display: flex;
  flex-direction: column;
  color: var(--gutter-text);
  text-align: right;
  z-index: 2;
}

.gutter-row {
  height: 22px;
  padding: 0 10px 0 6px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
}

.gutter-num {
  font-size: 12px;
}

.gutter-fold-btn {
  width: 14px;
  height: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--gutter-fold);
  opacity: 0.6;
  border-radius: 3px;
  transition: opacity 0.15s, transform 0.15s;
}

.gutter-fold-btn:hover {
  opacity: 1;
  background: var(--bg-hover);
}

.gutter-fold-btn.folded {
  transform: rotate(-90deg);
  color: var(--accent-hover);
  opacity: 1;
}

.code-content {
  flex: 1;
  padding: 12px 16px;
  white-space: pre;
  min-width: max-content;
  outline: none;
}

.code-line {
  height: 22px;
  display: block;
}

.code-line.folded-hidden {
  display: none;
}

.fold-ellipsis {
  display: inline-block;
  padding: 0 6px;
  margin: 0 4px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-muted);
  font-size: 11px;
  cursor: pointer;
}

.fold-ellipsis:hover {
  background: var(--bg-hover);
  color: var(--accent-hover);
}

/* JSON Token Colors */
.json-key {
  color: var(--json-key);
  font-weight: 500;
}

.json-string {
  color: var(--json-string);
}

.json-number {
  color: var(--json-number);
}

.json-boolean {
  color: var(--json-boolean);
  font-weight: 600;
}

.json-null {
  color: var(--json-null);
  font-weight: 600;
}

.json-bracket {
  color: var(--json-bracket);
  font-weight: 600;
}

.json-punct {
  color: var(--json-punctuation);
}

.json-link {
  text-decoration: underline;
  cursor: pointer;
  color: var(--json-url);
}

.json-link:hover {
  filter: brightness(1.2);
}

.search-highlight {
  background: rgba(255, 230, 0, 0.4);
  border-radius: 2px;
  color: inherit;
}

/* ==========================================================================
   Tree View Mode
   ========================================================================== */

.tree-viewer-container {
  flex: 1;
  overflow: auto;
  padding: 14px 18px;
  background: var(--bg-primary);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 24px;
}

.tree-node {
  margin-left: 20px;
  position: relative;
}

.tree-root {
  margin-left: 0;
}

.tree-line {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 2px 6px;
  border-radius: 4px;
  transition: background-color 0.1s;
}

.tree-line:hover {
  background: var(--bg-hover);
}

.tree-expander {
  width: 16px;
  height: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
  border-radius: 3px;
  transition: transform 0.15s;
}

.tree-expander.collapsed {
  transform: rotate(-90deg);
}

.tree-key {
  color: var(--json-key);
  font-weight: 500;
}

.tree-type-tag {
  font-size: 10px;
  padding: 1px 5px;
  border-radius: 3px;
  background: var(--bg-tertiary);
  color: var(--text-muted);
  margin-left: 4px;
}

.tree-badge-count {
  font-size: 11px;
  color: var(--text-muted);
}

.tree-actions {
  display: none;
  align-items: center;
  gap: 4px;
  margin-left: 10px;
}

.tree-line:hover .tree-actions {
  display: inline-flex;
}

.tree-action-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 11px;
  padding: 2px 4px;
  border-radius: 3px;
}

.tree-action-btn:hover {
  background: var(--bg-tertiary);
  color: var(--accent-hover);
}

/* ==========================================================================
   Modals & Popovers
   ========================================================================== */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(8px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 650px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95);
  transition: transform 0.2s ease;
  overflow: hidden;
}

.modal-backdrop.active .modal-content {
  transform: scale(1);
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 16px;
  font-weight: 600;
}

.modal-body {
  padding: 20px;
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.code-snippet {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 20px;
  max-height: 360px;
  overflow: auto;
  white-space: pre;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 45px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 200;
  pointer-events: none;
}

.toast {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 10px 16px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-primary);
  animation: toastIn 0.25s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  pointer-events: auto;
}

.toast.toast-success {
  border-left: 4px solid var(--success);
}

.toast.toast-error {
  border-left: 4px solid var(--danger);
}

.toast.toast-info {
  border-left: 4px solid var(--info);
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Scrollbars */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}