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

:root {
  /* Light mode (default) */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --text-primary: #1a1a2e;
  --text-secondary: #6b7280;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #10b981;
  --error: #ef4444;
  --border: #e5e7eb;
  --code-bg: #1e1e1e;
  --code-text: #d4d4d4;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "Monaco", "Consolas", "Liberation Mono", monospace;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

[data-theme="dark"] {
  --bg-primary: #0f0f0f;
  --bg-secondary: #1a1a1a;
  --text-primary: #e5e7eb;
  --text-secondary: #9ca3af;
  --accent: #60a5fa;
  --accent-hover: #3b82f6;
  --border: #2d2d2d;
  --code-bg: #0a0a0a;
  --code-text: #d4d4d4;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Layout */
header {
  border-bottom: 1px solid var(--border);
  padding: 1rem 3rem;
  background-color: var(--bg-primary);
  position: sticky;
  top: 0;
  z-index: 100;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1600px;
  margin: 0 auto;
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.15s;
}

.logo:hover {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.15s;
}

.nav-links a:hover {
  color: var(--text-primary);
}

main {
  max-width: 1600px;
  margin: 0 auto;
  padding: 2rem 3rem;
  flex: 1;
  width: 100%;
}

/* Hero */
.hero {
  text-align: center;
  margin-bottom: 3rem;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}

.hero p {
  color: var(--text-secondary);
  font-size: 1.125rem;
}

/* Options bar */
.options-bar {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  padding: 1rem;
  background-color: var(--bg-secondary);
  border-radius: 8px;
  border: 1px solid var(--border);
}

.option {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.option label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.option select {
  padding: 0.5rem 2rem 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: border-color 0.15s, box-shadow 0.15s;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
}

.option select:hover {
  border-color: var(--accent);
}

.option select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Editor container */
.editor-container {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  align-items: stretch;
}

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

.editor-panel {
  display: flex;
  flex-direction: column;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.panel-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

#input-stats,
#output-stats {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.panel-actions {
  display: flex;
  gap: 0.5rem;
}

textarea {
  width: 100%;
  min-height: 400px;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  resize: vertical;
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  transition: border-color 0.15s, box-shadow 0.15s;
}

textarea::placeholder {
  color: var(--text-secondary);
  opacity: 0.7;
}

textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

#output-pre {
  width: 100%;
  min-height: 400px;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background-color: var(--code-bg);
  overflow: auto;
  margin: 0;
  flex: 1;
}

#sql-output {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--code-text);
  white-space: pre;
  display: block;
}

#sql-output:empty::before {
  content: "Formatted SQL will appear here...";
  color: var(--text-secondary);
  opacity: 0.5;
}

/* Buttons */
.btn-primary {
  padding: 0.875rem 2rem;
  background-color: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.15s, transform 0.1s;
  box-shadow: var(--shadow);
}

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

.btn-primary:active {
  transform: scale(0.98);
}

.btn-secondary {
  padding: 0.5rem 1rem;
  background-color: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}

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

.btn-secondary:active {
  transform: scale(0.98);
}

.format-btn-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.keyboard-hint {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

@media (max-width: 900px) {
  .format-btn-container {
    padding: 1rem 0;
  }

  .btn-primary {
    width: 100%;
  }
}

/* Toast */
#toast-container {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  padding: 0.75rem 1.5rem;
  background-color: var(--success);
  color: white;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  animation: fadeInUp 0.3s ease, fadeOut 0.3s ease 1.7s forwards;
  pointer-events: auto;
}

.toast.error {
  background-color: var(--error);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeOut {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

/* Error message */
.error {
  margin-top: 1rem;
  padding: 0.875rem 1rem;
  background-color: #fef2f2;
  border: 1px solid #fecaca;
  color: var(--error);
  border-radius: 8px;
  font-size: 0.875rem;
}

[data-theme="dark"] .error {
  background-color: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.3);
}

/* History section */
.history-section {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  margin-bottom: 1rem;
}

.history-section h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.history-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s;
}

.history-item:hover {
  background-color: var(--bg-primary);
  border-color: var(--accent);
}

.history-item-preview {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 80%;
}

.history-item-time {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Content section */
.content {
  margin-top: 5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}

.content-header {
  text-align: center;
  margin-bottom: 3rem;
}

.content-header h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  letter-spacing: -0.025em;
}

.content-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 50ch;
  margin: 0 auto;
}

/* Before/After Example */
.example-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 4rem;
}

@media (max-width: 768px) {
  .example-section {
    grid-template-columns: 1fr;
  }
}

.example-block {
  position: relative;
}

.example-label {
  position: absolute;
  top: -0.625rem;
  left: 1rem;
  background-color: var(--bg-primary);
  padding: 0 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.example-code {
  padding: 1.25rem;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  overflow-x: auto;
  margin: 0;
  border: 1px solid var(--border);
}

.example-before {
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  white-space: pre-wrap;
  word-break: break-all;
}

.example-after {
  background-color: var(--code-bg);
  color: #9cdcfe;
  white-space: pre;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-bottom: 4rem;
}

@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
}

.feature-card {
  padding: 1.5rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.15s, transform 0.15s;
}

.feature-card:hover {
  border-color: var(--accent);
}

.feature-card h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
}

/* Dialects Section */
.dialects-section {
  margin-bottom: 3rem;
}

.dialects-section h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1rem;
  text-align: center;
}

.dialect-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.dialect-link {
  padding: 0.5rem 1rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.875rem;
  color: var(--text-primary);
  text-decoration: none;
  transition: all 0.15s;
}

a.dialect-link:hover {
  background-color: var(--accent);
  border-color: var(--accent);
  color: white;
}

.dialect-link-static {
  color: var(--text-secondary);
}

/* Shortcuts Section */
.shortcuts-section {
  margin-bottom: 2rem;
}

.shortcuts-section h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1rem;
  text-align: center;
}

.shortcuts-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
}

.shortcut {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

kbd {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-primary);
  box-shadow: 0 1px 0 var(--border);
}

.shortcut span {
  margin-left: 0.5rem;
  color: var(--text-secondary);
}

/* Legacy content styles (for dialect pages) */
.content > h2:first-child {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.content > h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.content > p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  max-width: 65ch;
}

.content a {
  color: var(--accent);
  text-decoration: none;
}

.content a:hover {
  text-decoration: underline;
}

.content > ul {
  color: var(--text-secondary);
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

.content > ul li {
  margin-bottom: 0.5rem;
}

.content > ul li strong {
  color: var(--text-primary);
}

/* Footer */
footer {
  margin-top: 4rem;
  padding: 2rem;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
  background-color: var(--bg-secondary);
}

footer p {
  margin-bottom: 0.25rem;
}

footer a {
  color: var(--accent);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* Theme toggle */
#theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.375rem 0.625rem;
  cursor: pointer;
  transition: border-color 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}

#theme-toggle:hover {
  border-color: var(--accent);
}

.theme-icon-light,
.theme-icon-dark {
  font-size: 1rem;
  line-height: 1;
  color: var(--text-primary);
}

/* Light mode: show moon, hide sun */
.theme-icon-dark {
  display: none;
}

/* Dark mode: show sun, hide moon */
[data-theme="dark"] .theme-icon-light {
  display: none;
}

[data-theme="dark"] .theme-icon-dark {
  display: inline;
}

/* Ad container placeholder */
.ad-container {
  margin: 2rem 0;
  padding: 2rem;
  background-color: var(--bg-secondary);
  border: 1px dashed var(--border);
  border-radius: 8px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Mobile adjustments */
@media (max-width: 768px) {
  header {
    padding: 1rem 1.5rem;
  }

  .nav-links {
    gap: 0.75rem;
  }

  .nav-links a {
    font-size: 0.8rem;
  }

  main {
    padding: 1.5rem;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .options-bar {
    gap: 1rem;
    padding: 0.75rem;
  }

  .option select {
    padding: 0.5rem 1.5rem 0.5rem 0.5rem;
    font-size: 0.8rem;
  }

  textarea,
  #output-pre {
    min-height: 250px;
  }
}

@media (max-width: 480px) {
  .nav-links a:not(:first-child):not(:last-child) {
    display: none;
  }

  .options-bar {
    flex-direction: column;
    gap: 0.75rem;
  }

  .option {
    width: 100%;
  }

  .option select {
    width: 100%;
  }
}

/* Highlight.js overrides for dark code blocks */
.hljs {
  background: transparent !important;
  padding: 0 !important;
}

/* Scrollbar styling */
textarea::-webkit-scrollbar,
#output-pre::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

textarea::-webkit-scrollbar-track,
#output-pre::-webkit-scrollbar-track {
  background: transparent;
}

textarea::-webkit-scrollbar-thumb,
#output-pre::-webkit-scrollbar-thumb {
  background-color: var(--border);
  border-radius: 4px;
}

textarea::-webkit-scrollbar-thumb:hover,
#output-pre::-webkit-scrollbar-thumb:hover {
  background-color: var(--text-secondary);
}

/* Focus visible for accessibility */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button:focus:not(:focus-visible),
select:focus:not(:focus-visible),
textarea:focus:not(:focus-visible) {
  outline: none;
}