/* ===== CSS Variables / Theming ===== */
:root,
[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --bg-tertiary: #e8e8e8;
  --bg-navbar: #1a1a2e;
  --text-primary: #1a1a1a;
  --text-secondary: #555;
  --text-navbar: #e0e0e0;
  --border-color: #d0d0d0;
  --divider-color: #c0c0c0;
  --divider-hover: #888;
  --accent: #4a6cf7;
  --accent-hover: #3a5ce5;
  --error-bg: #fff0f0;
  --error-text: #cc0000;
  --error-border: #ffcccc;
  --pane-header-bg: #eaeaea;
  --pane-header-text: #555;
  --btn-bg: transparent;
  --btn-hover: rgba(255,255,255,0.12);
  --btn-active: rgba(255,255,255,0.2);
  --shadow: 0 2px 8px rgba(0,0,0,0.1);
  --cm-bg: #ffffff;
}

[data-theme="dark"] {
  --bg-primary: #1e1e2e;
  --bg-secondary: #181825;
  --bg-tertiary: #313244;
  --bg-navbar: #11111b;
  --text-primary: #cdd6f4;
  --text-secondary: #a6adc8;
  --text-navbar: #cdd6f4;
  --border-color: #45475a;
  --divider-color: #45475a;
  --divider-hover: #89b4fa;
  --accent: #89b4fa;
  --accent-hover: #74c7ec;
  --error-bg: #302030;
  --error-text: #f38ba8;
  --error-border: #5a3040;
  --pane-header-bg: #181825;
  --pane-header-text: #a6adc8;
  --btn-bg: transparent;
  --btn-hover: rgba(255,255,255,0.08);
  --btn-active: rgba(255,255,255,0.15);
  --shadow: 0 2px 8px rgba(0,0,0,0.4);
  --cm-bg: #1e1e2e;
}

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

html, body {
  height: 100%;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg-secondary);
  color: var(--text-primary);
}

/* ===== Navbar ===== */
#navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 44px;
  padding: 0 12px;
  background: var(--bg-navbar);
  color: var(--text-navbar);
  box-shadow: var(--shadow);
  z-index: 100;
  gap: 8px;
  user-select: none;
}

.nav-left, .nav-center, .nav-right {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-left {
  flex-shrink: 0;
}

.nav-center {
  flex-wrap: nowrap;
  gap: 2px;
}

.nav-right {
  flex-shrink: 0;
}

.app-title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.3px;
  margin-right: 8px;
  color: #fff;
}

.dirty-indicator {
  display: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #f59e0b;
  margin-right: 4px;
}

.dirty-indicator.visible {
  display: inline-block;
}

.filename-display {
  font-size: 12px;
  opacity: 0.7;
  max-width: 150px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#navbar button {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 8px;
  border: none;
  border-radius: 4px;
  background: var(--btn-bg);
  color: var(--text-navbar);
  font-size: 12px;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}

#navbar button:hover {
  background: var(--btn-hover);
}

#navbar button:active {
  background: var(--btn-active);
}

#navbar button svg {
  flex-shrink: 0;
}

.btn-separator {
  width: 1px;
  height: 20px;
  background: rgba(255,255,255,0.15);
  margin: 0 4px;
}

/* ===== Expand Print Toggle ===== */
.expand-print-toggle {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  font-size: 12px;
  color: var(--text-navbar);
  cursor: pointer;
  border-radius: 4px;
  transition: background 0.15s;
  user-select: none;
}

.expand-print-toggle:hover {
  background: var(--btn-hover);
}

.expand-print-toggle input[type="checkbox"] {
  accent-color: var(--accent);
  width: 14px;
  height: 14px;
  cursor: pointer;
  margin: 0;
}

.zoom-level {
  font-size: 11px;
  min-width: 42px;
  text-align: center;
  opacity: 0.8;
  font-variant-numeric: tabular-nums;
}

/* ===== Main Layout ===== */
#main {
  display: flex;
  height: calc(100% - 44px);
}

.pane {
  display: flex;
  flex-direction: column;
  min-width: 100px;
  overflow: hidden;
}

#editor-pane {
  width: 40%;
  background: var(--bg-primary);
  border-right: 1px solid var(--border-color);
}

#preview-pane {
  flex: 1;
  background: var(--bg-primary);
}

.pane-header {
  height: 28px;
  display: flex;
  align-items: center;
  padding: 0 12px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: var(--pane-header-bg);
  color: var(--pane-header-text);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

/* ===== Divider ===== */
#divider {
  width: 5px;
  cursor: col-resize;
  background: var(--divider-color);
  transition: background 0.15s;
  flex-shrink: 0;
  z-index: 10;
}

#divider:hover,
#divider.active {
  background: var(--divider-hover);
}

/* ===== Editor ===== */
#editor-container {
  flex: 1;
  overflow: hidden;
}

#editor-container .CodeMirror {
  height: 100%;
  font-size: 14px;
  line-height: 1.5;
  font-family: "Fira Code", "Cascadia Code", "JetBrains Mono", "Consolas", monospace;
  background: var(--cm-bg);
}

/* Light theme CodeMirror overrides */
[data-theme="light"] #editor-container .CodeMirror {
  color: var(--text-primary);
}

/* Dark theme: use Dracula */
[data-theme="dark"] #editor-container .CodeMirror {
  background: #1e1e2e;
}

/* ===== Preview ===== */
#preview-container {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: var(--bg-primary);
}

#preview-viewport {
  width: 100%;
  height: 100%;
  overflow: hidden;
  cursor: grab;
  display: flex;
  align-items: center;
  justify-content: center;
}

#preview-viewport:active {
  cursor: grabbing;
}

#mermaid-output {
  transform-origin: 0 0;
  transition: none;
  padding: 20px;
  display: inline-block;
}

#mermaid-output svg {
  max-width: none !important;
}

/* ===== Fence Notice ===== */
.fence-notice {
  background: #fef3c7;
  color: #92400e;
  border: 1px solid #f59e0b;
  border-radius: 4px;
  padding: 6px 12px;
  margin-bottom: 8px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 13px;
}

.fence-notice code {
  background: rgba(0,0,0,0.08);
  padding: 1px 4px;
  border-radius: 2px;
  font-size: 12px;
}

[data-theme="dark"] .fence-notice {
  background: #422006;
  color: #fde68a;
  border-color: #b45309;
}

[data-theme="dark"] .fence-notice code {
  background: rgba(255,255,255,0.1);
}

/* ===== Error Display ===== */
.error-display .error-message {
  margin-bottom: 8px;
}

.error-help {
  border-top: 1px solid var(--error-border);
  padding-top: 8px;
  margin-top: 4px;
}

.error-help-header {
  font-weight: 700;
  font-size: 14px;
  margin-bottom: 8px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text-primary);
}

.error-help-item {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 8px 12px;
  margin-bottom: 6px;
}

.error-help-title {
  font-weight: 600;
  font-size: 13px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.error-help-detail {
  font-size: 13px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text-secondary);
  line-height: 1.5;
}

.error-help-detail code {
  background: var(--bg-tertiary);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 12px;
  font-family: "Fira Code", "Cascadia Code", monospace;
}

.error-help-detail a {
  color: var(--accent);
}

.error-help-btn {
  margin-top: 6px;
  padding: 5px 14px;
  border: none;
  border-radius: 4px;
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  cursor: pointer;
  font-weight: 500;
}

.error-help-btn:hover {
  background: var(--accent-hover);
}

.error-display {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  max-height: 60%;
  overflow-y: auto;
  padding: 12px 16px;
  background: var(--error-bg);
  border-top: 2px solid var(--error-border);
  color: var(--error-text);
  font-family: monospace;
  font-size: 13px;
  white-space: pre-wrap;
  word-break: break-word;
  z-index: 5;
}

/* ===== Debugger Panel ===== */
.debugger-panel {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 200px;
  background: var(--bg-navbar);
  color: var(--text-navbar);
  z-index: 200;
  display: flex;
  flex-direction: column;
  box-shadow: 0 -2px 12px rgba(0,0,0,0.3);
  font-family: "Fira Code", "Cascadia Code", "JetBrains Mono", "Consolas", monospace;
  font-size: 12px;
}

.debugger-panel.open {
  display: flex;
}

.debugger-resize-handle {
  height: 4px;
  cursor: ns-resize;
  background: transparent;
  flex-shrink: 0;
  position: relative;
}

.debugger-resize-handle:hover,
.debugger-resize-handle.active {
  background: var(--accent);
}

.debugger-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 32px;
  padding: 0 8px;
  background: var(--bg-navbar);
  border-bottom: 1px solid rgba(255,255,255,0.1);
  flex-shrink: 0;
}

.debugger-tabs {
  display: flex;
  gap: 0;
}

.debugger-tab {
  padding: 6px 14px;
  border: none;
  background: transparent;
  color: var(--text-navbar);
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: background 0.15s, border-color 0.15s;
  opacity: 0.7;
  font-family: inherit;
}

.debugger-tab:hover {
  background: var(--btn-hover);
  opacity: 1;
}

.debugger-tab.active {
  border-bottom-color: var(--accent);
  opacity: 1;
}

.debugger-close {
  background: transparent;
  border: none;
  color: var(--text-navbar);
  font-size: 18px;
  cursor: pointer;
  padding: 2px 8px;
  border-radius: 3px;
  line-height: 1;
  opacity: 0.7;
}

.debugger-close:hover {
  background: var(--btn-hover);
  opacity: 1;
}

.debugger-body {
  flex: 1;
  overflow: hidden;
  position: relative;
}

.debugger-content {
  display: none;
  position: absolute;
  inset: 0;
  overflow-y: auto;
  padding: 8px 12px;
}

.debugger-content.active {
  display: block;
}

.debugger-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
  flex-shrink: 0;
}

.debugger-toolbar-btn {
  padding: 2px 10px;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 3px;
  background: rgba(255,255,255,0.05);
  color: var(--text-navbar);
  font-size: 11px;
  cursor: pointer;
  font-family: inherit;
}

.debugger-toolbar-btn:hover {
  background: rgba(255,255,255,0.12);
}

.debugger-version-badge {
  font-size: 10px;
  opacity: 0.5;
  margin-right: auto;
}

/* Syntax tab */
.debug-diagram-type {
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 4px;
}

.debug-syntax-structure {
  opacity: 0.7;
  margin-bottom: 4px;
}

.debug-syntax-error {
  color: #f38ba8;
  background: rgba(243,139,168,0.1);
  padding: 4px 8px;
  border-radius: 3px;
  margin-top: 4px;
  border-left: 3px solid #f38ba8;
}

.debug-syntax-suggestion {
  color: #a6e3a1;
  padding: 2px 8px;
  margin-top: 4px;
  font-style: italic;
}

.debug-syntax-ok {
  color: #a6e3a1;
}

/* Errors tab */
.debug-error-entry {
  padding: 4px 8px;
  margin-bottom: 4px;
  border-radius: 3px;
  border-left: 3px solid;
  font-size: 11px;
  word-break: break-word;
}

.debug-error-entry.severity-error {
  border-left-color: #f38ba8;
  background: rgba(243,139,168,0.08);
  color: #f38ba8;
}

.debug-error-entry.severity-warning {
  border-left-color: #f9e2af;
  background: rgba(249,226,175,0.08);
  color: #f9e2af;
}

.debug-error-entry.severity-info {
  border-left-color: #89b4fa;
  background: rgba(137,180,250,0.08);
  color: #89b4fa;
}

.debug-error-timestamp {
  font-size: 10px;
  opacity: 0.5;
  margin-right: 8px;
}

.debug-no-errors {
  opacity: 0.4;
  font-style: italic;
}

/* State tab */
.debug-state-section {
  margin-bottom: 8px;
}

.debug-state-section-title {
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 2px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.debug-state-row {
  display: flex;
  gap: 8px;
  padding: 1px 0;
}

.debug-state-key {
  color: #cba6f7;
  min-width: 140px;
}

.debug-state-value {
  color: #a6e3a1;
  word-break: break-all;
}

/* Console tab */
.debug-console-entry {
  padding: 2px 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  word-break: break-word;
}

.debug-console-entry.level-log {
  color: rgba(255,255,255,0.7);
}

.debug-console-entry.level-warn {
  color: #f9e2af;
  background: rgba(249,226,175,0.05);
}

.debug-console-entry.level-error {
  color: #f38ba8;
  background: rgba(243,139,168,0.05);
}

.debug-console-timestamp {
  font-size: 10px;
  opacity: 0.4;
  margin-right: 8px;
}

.debug-console-empty {
  opacity: 0.4;
  font-style: italic;
}

/* Adjust main layout when debugger is open */
body.debugger-open #main {
  height: calc(100% - 44px - var(--debugger-height, 200px));
}

/* ===== Print Styles ===== */
@media print {
  #navbar,
  #editor-pane,
  #divider,
  .pane-header,
  .error-display,
  .debugger-panel {
    display: none !important;
  }

  #main {
    height: auto;
    display: block;
  }

  #preview-pane {
    width: 100% !important;
    height: auto !important;
  }

  #preview-container {
    overflow: visible;
  }

  #preview-viewport {
    overflow: visible;
    cursor: default;
  }

  #mermaid-output {
    transform: none !important;
    padding: 0;
  }

  /* Expanded print mode: diagram uses 80% page width, flows across multiple pages */
  body.print-expanded #mermaid-output svg {
    width: 80vw !important;
    height: auto !important;
    margin: 0 auto;
    display: block;
  }

  body.print-expanded #mermaid-output {
    display: flex;
    justify-content: center;
  }

  body.print-expanded #preview-pane,
  body.print-expanded #preview-container,
  body.print-expanded #preview-viewport {
    overflow: visible !important;
    height: auto !important;
  }

  body {
    overflow: visible;
    background: white;
  }
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(2px);
}

.modal-content {
  background: var(--bg-primary);
  color: var(--text-primary);
  border-radius: 12px;
  padding: 28px 32px;
  max-width: 900px;
  width: 90%;
  max-height: 85vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 16px;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  line-height: 1;
}

.modal-close:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.modal-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 2px;
}

.modal-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.modal-section {
  margin-bottom: 18px;
}

.modal-section h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
}

.modal-section p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 8px;
}

.modal-section a {
  color: var(--accent);
}

.modal-divider {
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

.modal-columns {
  display: flex;
  gap: 32px;
}

.modal-col-left,
.modal-col-right {
  flex: 1;
  min-width: 0;
}

.modal-col-right {
  border-left: 1px solid var(--border-color);
  padding-left: 32px;
}

@media (max-width: 700px) {
  .modal-columns {
    flex-direction: column;
    gap: 0;
  }

  .modal-col-right {
    border-left: none;
    padding-left: 0;
    border-top: 1px solid var(--border-color);
    padding-top: 16px;
  }
}

/* Shortcut grid */
.shortcut-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 12px;
  font-size: 13px;
}

.shortcut-grid kbd {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 2px 8px;
  font-family: "Fira Code", "Cascadia Code", monospace;
  font-size: 11px;
  white-space: nowrap;
}

.shortcut-grid span {
  color: var(--text-secondary);
  padding: 2px 0;
}

/* Support buttons */
.support-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.support-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.15s, opacity 0.15s;
}

.support-button:hover {
  transform: scale(1.05);
  opacity: 0.9;
}

.modal-section .paypal-button {
  background: #0070ba;
  color: #fff;
}

.modal-section .venmo-button {
  background: #008CFF;
  color: #fff;
}

/* Feature request form */
.feature-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.feature-input {
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 13px;
  outline: none;
  transition: border-color 0.15s;
}

.feature-input:focus {
  border-color: var(--accent);
}

.feature-textarea {
  resize: vertical;
  min-height: 60px;
}

.feature-submit {
  align-self: flex-start;
  padding: 8px 20px;
  border: none;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

.feature-submit:hover {
  background: var(--accent-hover);
}

.feature-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.feature-status {
  font-size: 13px;
  min-height: 20px;
}

.feature-status.success {
  color: #22c55e;
}

.feature-status.error {
  color: var(--error-text);
}

/* ===== Responsive ===== */
@media (max-width: 700px) {
  #navbar button span {
    display: none;
  }

  .nav-center {
    gap: 0;
  }

  .btn-separator {
    margin: 0 2px;
  }

  .app-title {
    font-size: 14px;
    margin-right: 4px;
  }

  .filename-display {
    display: none;
  }
}

/* ===== Scrollbar Styling ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

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

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