@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  color-scheme: light;
  --bg: #f8f9fa;
  --panel-bg: #ffffff;
  --border: #e5e7eb;
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-soft: rgba(59, 130, 246, 0.08);
  --editor-font: 'JetBrains Mono', 'Menlo', 'Monaco', 'Courier New', monospace;
  --transition: 0.15s ease;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

body.dark {
  color-scheme: dark;
  --bg: #111827;
  --panel-bg: #1f2937;
  --border: #374151;
  --text: #f9fafb;
  --muted: #9ca3af;
  --accent: #60a5fa;
  --accent-hover: #3b82f6;
  --accent-soft: rgba(96, 165, 250, 0.1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
}

.app {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.workspace {
  flex: 1;
  display: flex;
  padding: 1.5rem;
  gap: 1.5rem;
  min-height: 0;
  overflow: hidden;
}

.editor-pane,
.preview-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  min-width: 0;
  box-shadow: var(--shadow-sm);
}

.pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: var(--panel-bg);
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.01em;
  color: var(--text);
}

.pane-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.collapse-button {
  display: none;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  background: transparent;
  border: none;
  color: var(--muted);
  cursor: pointer;
  border-radius: 6px;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.collapse-button:hover,
.collapse-button:focus-visible {
  background: var(--accent-soft);
  color: var(--accent);
}

.collapse-button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.collapse-button i {
  transition: transform var(--transition);
  pointer-events: none;
}

.pane-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.status {
  font-size: 0.75rem;
  color: var(--muted);
}

.button {
  border: none;
  background: transparent;
  color: var(--muted);
  border-radius: 6px;
  font-size: 0.875rem;
  padding: 0.5rem 1rem;
  cursor: pointer;
  transition: all var(--transition);
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
  font-weight: 500;
  font-family: inherit;
}

.button:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

.button:active {
  transform: scale(0.98);
}

.button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.button-icon {
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border-radius: 8px;
}

.button-icon i {
  pointer-events: none;
}

.button-icon.is-active,
.button-icon.is-active:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  border: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

textarea {
  flex: 1;
  border: none;
  background: transparent;
  padding: 1.25rem;
  font-family: var(--editor-font);
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--text);
  resize: none;
  outline: none;
  caret-color: var(--accent);
  -webkit-overflow-scrolling: touch;
}

textarea::selection {
  background: var(--accent);
  color: #fff;
}

.preview-pane {
  position: relative;
}

.preview-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--muted);
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  cursor: pointer;
  user-select: none;
}

.toggle input {
  margin: 0;
}

.preview-content {
  flex: 1;
  overflow: auto;
  padding: 1.25rem 1.5rem 2.5rem;
  -webkit-overflow-scrolling: touch;
  font-size: 0.9375rem;
  line-height: 1.7;
}

.preview-content h1,
.preview-content h2,
.preview-content h3,
.preview-content h4,
.preview-content h5,
.preview-content h6 {
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.preview-content h1 {
  font-size: 2rem;
}

.preview-content h2 {
  font-size: 1.6rem;
}

.preview-content pre {
  position: relative;
  margin: 1.25rem 0;
  background: #1e293b;
  color: #e2e8f0;
  padding: 1.25rem 1.5rem;
  border-radius: 8px;
  overflow-x: auto;
  overflow-y: auto;
  font-size: 0.875rem;
  line-height: 1.6;
  border: 1px solid #334155;
  font-family: var(--editor-font);
  -webkit-overflow-scrolling: touch;
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

body.dark .preview-content pre {
  background: #0f172a;
  border: 1px solid #1e293b;
}

.preview-content code {
  background: #f1f5f9;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.875em;
  font-family: var(--editor-font);
  color: #475569;
}

.preview-content pre code {
  display: block;
  background: transparent;
  padding: 0;
  color: inherit;
  overflow: visible;
  white-space: pre-wrap;
  word-wrap: break-word;
}

body.dark .preview-content :not(pre) > code {
  background: #334155;
  color: #94a3b8;
}

.preview-content .hljs {
  background: transparent;
  color: inherit;
}

.preview-content .hljs-keyword,
.preview-content .hljs-title.class_,
.preview-content .hljs-title.function_,
.preview-content .hljs-meta .hljs-keyword {
  color: #ff7b72;
  font-weight: 600;
}

.preview-content .hljs-string,
.preview-content .hljs-template-tag,
.preview-content .hljs-template-variable,
.preview-content .hljs-symbol {
  color: #a5d6ff;
}

.preview-content .hljs-number,
.preview-content .hljs-literal,
.preview-content .hljs-builtin-name,
.preview-content .hljs-attribute {
  color: #79c0ff;
}

.preview-content .hljs-comment,
.preview-content .hljs-quote {
  color: rgba(148, 163, 184, 0.7);
  font-style: italic;
}

.preview-content .hljs-operator,
.preview-content .hljs-punctuation {
  color: rgba(226, 232, 240, 0.85);
}

.preview-content .hljs-variable,
.preview-content .hljs-property {
  color: #f9f871;
}

.preview-content blockquote {
  margin: 1.5rem 0;
  padding: 0.75rem 1.2rem;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 6px 6px 0;
}

.preview-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

.preview-content th,
.preview-content td {
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--border);
  text-align: left;
}

.preview-content ul,
.preview-content ol {
  padding-left: 1.4rem;
}

.preview-content img {
  max-width: 100%;
  border-radius: 8px;
  margin: 1rem 0;
}

.empty-state {
  text-align: center;
  color: var(--muted);
  margin-top: 5rem;
}

@media (max-width: 1100px) {
  .workspace {
    flex-direction: column;
    height: auto;
  }

  .editor-pane,
  .preview-pane {
    height: 50vh;
    min-height: 300px;
    transition: height 0.3s ease, min-height 0.3s ease;
  }

  .collapse-button {
    display: inline-flex;
  }

  .editor-pane.collapsed,
  .preview-pane.collapsed {
    height: auto !important;
    min-height: auto !important;
    flex: 0 0 auto;
  }

  .editor-pane.collapsed .collapse-button i,
  .preview-pane.collapsed .collapse-button i {
    transform: rotate(-90deg);
  }

  .editor-pane.collapsed textarea,
  .preview-pane.collapsed .preview-content {
    display: none !important;
  }
}

@media (max-width: 768px) {
  .workspace {
    padding: 0.5rem;
    gap: 0.5rem;
  }

  .editor-pane,
  .preview-pane {
    border-radius: 12px;
    min-height: 250px;
  }

  .pane-header {
    padding: 0.6rem 0.85rem;
    font-size: 0.9rem;
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .pane-actions {
    gap: 0.5rem;
  }

  .button {
    font-size: 0.8rem;
    padding: 0.5rem 0.8rem;
    min-height: 44px;
  }

  .button-icon {
    width: 44px;
    height: 44px;
    min-width: 44px;
  }

  textarea {
    padding: 0.85rem;
    font-size: 1rem;
    line-height: 1.65;
  }

  .preview-content {
    padding: 0.85rem 1rem 2rem;
    font-size: 0.95rem;
  }

  .preview-content h1 {
    font-size: 1.75rem;
  }

  .preview-content h2 {
    font-size: 1.45rem;
  }

  .preview-content h3 {
    font-size: 1.25rem;
  }

  .preview-content pre {
    padding: 2.5rem 1rem 1rem;
    font-size: 0.85rem;
    border-radius: 12px;
    margin: 1.25rem 0;
  }

  .preview-content pre::before {
    height: 2rem;
    border-radius: 12px 12px 0 0;
  }

  .preview-content pre::after {
    top: 0.6rem;
    left: 1rem;
    width: 0.55rem;
    height: 0.55rem;
    box-shadow:
      0.85rem 0 0 #ffbd2e,
      1.7rem 0 0 #27c93f;
  }

  .preview-content code {
    font-size: 0.9rem;
  }

  .preview-content blockquote {
    padding: 0.6rem 1rem;
    margin: 1.25rem 0;
  }

  .preview-content table {
    font-size: 0.9rem;
  }

  .preview-content th,
  .preview-content td {
    padding: 0.5rem 0.6rem;
  }

  .status {
    font-size: 0.7rem;
  }

  .toggle {
    font-size: 0.75rem;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 14px;
  }

  .workspace {
    padding: 0.25rem;
    gap: 0.25rem;
  }

  .editor-pane,
  .preview-pane {
    border-radius: 8px;
    min-height: 200px;
  }

  .pane-header {
    padding: 0.5rem 0.7rem;
    font-size: 0.85rem;
  }

  .button {
    font-size: 0.75rem;
    padding: 0.45rem 0.7rem;
    border-radius: 8px;
  }

  .button-icon {
    width: 40px;
    height: 40px;
    min-width: 40px;
    border-radius: 6px;
  }

  textarea {
    padding: 0.75rem;
    font-size: 0.95rem;
  }

  .preview-content {
    padding: 0.75rem 0.85rem 1.5rem;
    font-size: 0.9rem;
  }

  .preview-content h1 {
    font-size: 1.5rem;
  }

  .preview-content h2 {
    font-size: 1.3rem;
  }

  .preview-content h3 {
    font-size: 1.15rem;
  }

  .preview-content pre {
    padding: 2.25rem 0.85rem 0.85rem;
    font-size: 0.8rem;
    border-radius: 10px;
    margin: 1rem 0;
  }

  .preview-content pre::before {
    height: 1.75rem;
    border-radius: 10px 10px 0 0;
  }

  .preview-content pre::after {
    top: 0.5rem;
    left: 0.85rem;
    width: 0.5rem;
    height: 0.5rem;
    box-shadow:
      0.75rem 0 0 #ffbd2e,
      1.5rem 0 0 #27c93f;
  }

  .preview-content code {
    font-size: 0.85rem;
    padding: 0.15rem 0.35rem;
  }

  .preview-content blockquote {
    padding: 0.5rem 0.85rem;
    margin: 1rem 0;
    border-radius: 0 8px 8px 0;
  }

  .preview-content table {
    font-size: 0.85rem;
  }

  .preview-content th,
  .preview-content td {
    padding: 0.45rem 0.5rem;
  }

  .preview-content ul,
  .preview-content ol {
    padding-left: 1.2rem;
  }

  .status {
    display: none;
  }

  .pane-actions {
    gap: 0.35rem;
  }

  .toggle span {
    display: none;
  }

  .toggle {
    font-size: 0;
  }

  .toggle input {
    width: 16px;
    height: 16px;
  }
}

.snackbar {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--text);
  color: var(--panel-bg);
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.05);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1000;
  pointer-events: none;
}

.snackbar.show {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

@media (max-width: 768px) {
  .snackbar {
    bottom: 1rem;
    padding: 0.65rem 1.25rem;
    font-size: 0.85rem;
  }
}

/* Onboarding Tour Customization (Intro.js) */
.introjs-overlay {
  opacity: 0.8 !important;
}

.introjs-tooltip {
  background: var(--panel-bg);
  color: var(--text);
  border-radius: 8px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
  max-width: 400px;
  min-width: 250px;
  z-index: 999999 !important;
}

.introjs-tooltiptext {
  color: var(--text);
  font-size: 0.875rem;
  line-height: 1.6;
  padding: 0.5rem;
}

.introjs-button {
  background: var(--accent);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  text-shadow: none;
  transition: all var(--transition);
  cursor: pointer;
}

.introjs-button:hover {
  background: var(--accent-hover);
}

.introjs-button:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  box-shadow: none;
}

.introjs-skipbutton {
  color: var(--muted);
  font-weight: 500;
  cursor: pointer;
}

.introjs-skipbutton:hover {
  color: var(--text);
}

.introjs-progress {
  background: var(--border);
}

.introjs-progressbar {
  background: var(--accent);
}

.introjs-helperLayer {
  background: transparent;
  border: 2px solid var(--accent);
  box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.5);
  border-radius: 8px;
  z-index: 999998 !important;
}

.introjs-fixedTooltip {
  position: fixed !important;
}

/* Mobile-specific adjustments for Intro.js */
@media (max-width: 768px) {
  .introjs-tooltip {
    max-width: 90vw !important;
    min-width: 280px;
    position: fixed !important;
    left: 5vw !important;
    right: 5vw !important;
    bottom: 20px !important;
    top: auto !important;
    margin: 0 !important;
  }

  .introjs-arrow {
    display: none !important;
  }

  .introjs-tooltiptext {
    font-size: 0.95rem;
    padding: 1rem;
  }

  .introjs-button {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    min-height: auto;
    line-height: 1.4;
  }

  .introjs-bullets,
  .introjs-progress {
    padding: 0.5rem 0;
  }

  .introjs-tooltipbuttons {
    padding: 0.5rem 1rem;
  }
}

@media (max-width: 480px) {
  .introjs-tooltip {
    max-width: 95vw !important;
    min-width: 260px;
    left: 2.5vw !important;
    right: 2.5vw !important;
  }

  .introjs-tooltiptext {
    font-size: 0.9rem;
    padding: 0.85rem;
  }
}