/* CSS Variables - Design Tokens */
:root {
  /* Colors */
  --background: #09090b;
  --background-subtle: #18181b;
  --surface: #1c1c1f;
  --surface-elevated: #27272a;
  --border: #3f3f46;
  --border-subtle: #27272a;
  
  --foreground: #fafafa;
  --foreground-muted: #a1a1aa;
  --foreground-subtle: #71717a;
  
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --primary-foreground: #ffffff;
  
  --accent: #22c55e;
  --accent-hover: #16a34a;
  
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.1);
  
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.1);
  
  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, 'SF Mono', Menlo, monospace;
  
  /* Spacing */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
}

/* Light theme */
[data-theme="light"] {
  --background: #ffffff;
  --background-subtle: #f4f4f5;
  --surface: #fafafa;
  --surface-elevated: #ffffff;
  --border: #e4e4e7;
  --border-subtle: #f4f4f5;
  
  --foreground: #09090b;
  --foreground-muted: #52525b;
  --foreground-subtle: #a1a1aa;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--background);
  color: var(--foreground);
  line-height: 1.5;
  min-height: 100vh;
}

/* App Layout */
.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--background);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  align-items: center;
  gap: 16px;
}

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

.logo-icon {
  width: 28px;
  height: 28px;
  color: var(--primary);
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.tagline {
  color: var(--foreground-muted);
  font-size: 14px;
  display: none;
}

/* Navigation Links */
.nav-links {
  display: none;
  align-items: center;
  gap: 8px;
  margin-left: 24px;
}

@media (min-width: 640px) {
  .nav-links {
    display: flex;
  }
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--foreground-muted);
  text-decoration: none;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--foreground);
  background: var(--surface);
}

.nav-link.active {
  color: var(--primary);
  background: rgba(59, 130, 246, 0.1);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Main Content */
.main {
  flex: 1;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

@media (min-width: 768px) {
  .main {
    padding: 24px;
    gap: 20px;
  }
}

/* Controls Section */
.controls {
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 16px;
}

@media (min-width: 768px) {
  .controls {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
    padding: 20px;
  }
}

.conversion-selector {
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

@media (min-width: 640px) {
  .conversion-selector {
    flex-direction: row;
    gap: 16px;
  }
}

.select-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}

.select-group label {
  font-size: 13px;
  font-weight: 500;
  color: var(--foreground-muted);
}

.select, .input {
  height: 44px;
  padding: 0 14px;
  font-size: 14px;
  font-family: var(--font-sans);
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--foreground);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  width: 100%;
}

.select:focus, .input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23a1a1aa' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
}

.component-name-group {
  max-width: 100%;
}

@media (min-width: 640px) {
  .component-name-group {
    max-width: 200px;
  }
}

.action-buttons {
  display: flex;
  gap: 8px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 44px;
  padding: 0 20px;
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font-sans);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn .icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

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

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

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

.btn-secondary {
  background: var(--surface-elevated);
  color: var(--foreground);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--border);
}

.btn-text-desktop {
  display: none;
}

@media (min-width: 640px) {
  .btn-text-desktop {
    display: inline;
  }
}

/* Icon Button */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--foreground-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  background: var(--surface-elevated);
  color: var(--foreground);
  border-color: var(--border);
}

.icon-btn .icon {
  width: 18px;
  height: 18px;
}

/* Theme Toggle */
#themeToggle .sun-icon {
  display: none;
}

#themeToggle .moon-icon {
  display: block;
}

[data-theme="light"] #themeToggle .sun-icon {
  display: block;
}

[data-theme="light"] #themeToggle .moon-icon {
  display: none;
}

/* Status Bar */
.status {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--foreground-muted);
}

.status-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.status.success {
  border-color: var(--accent);
  color: var(--accent);
}

.status.success .status-icon {
  color: var(--accent);
}

.status.error {
  border-color: var(--danger);
  color: var(--danger);
  background: var(--danger-bg);
}

.status.loading {
  color: var(--primary);
}

.status.loading .status-icon {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Editors Section */
.editors {
  display: grid;
  gap: 16px;
  flex: 1;
  min-height: 400px;
}

@media (min-width: 1024px) {
  .editors {
    grid-template-columns: 1fr 1fr;
    min-height: 500px;
  }
}

.editor-panel {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--background-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.panel-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
}

.panel-title .icon {
  width: 16px;
  height: 16px;
  color: var(--foreground-muted);
}

.lang-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 8px;
  background: var(--primary);
  color: var(--primary-foreground);
  border-radius: 100px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.panel-actions {
  display: flex;
  gap: 4px;
}

.panel-actions .icon-btn {
  width: 34px;
  height: 34px;
  border: none;
  background: transparent;
}

.panel-actions .icon-btn:hover {
  background: var(--surface-elevated);
}

.panel-actions .icon {
  width: 16px;
  height: 16px;
}

.editor {
  flex: 1;
  width: 100%;
  min-height: 300px;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--foreground);
  background: var(--background);
  border: none;
  resize: none;
}

.editor:focus {
  outline: none;
}

.editor::placeholder {
  color: var(--foreground-subtle);
}

.panel-footer {
  padding: 8px 16px;
  background: var(--background-subtle);
  border-top: 1px solid var(--border-subtle);
  font-size: 12px;
  color: var(--foreground-subtle);
}

/* Warnings Section */
.warnings {
  background: var(--warning-bg);
  border: 1px solid var(--warning);
  border-radius: var(--radius-lg);
  padding: 16px;
}

.warnings.hidden {
  display: none;
}

.warnings-header {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--warning);
  margin-bottom: 12px;
}

.warning-icon {
  width: 18px;
  height: 18px;
}

.warning-count {
  font-size: 12px;
  padding: 2px 8px;
  background: var(--warning);
  color: var(--background);
  border-radius: 100px;
}

.warning-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.warning-list li {
  font-size: 13px;
  color: var(--foreground-muted);
  padding-left: 20px;
  position: relative;
}

.warning-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--warning);
  border-radius: 50%;
}

/* Examples Section */
.examples {
  padding-top: 16px;
}

.section-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--foreground-muted);
  margin-bottom: 12px;
}

.example-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

@media (min-width: 480px) {
  .example-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 768px) {
  .example-grid {
    grid-template-columns: repeat(6, 1fr);
  }
}

.example-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px 12px;
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-sans);
}

.example-card:hover {
  border-color: var(--primary);
  background: var(--surface-elevated);
}

.example-icon {
  font-size: 13px;
  font-weight: 700;
  font-family: var(--font-mono);
  padding: 6px 10px;
  background: var(--background);
  border-radius: var(--radius-sm);
  color: var(--primary);
}

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

/* Footer */
.footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--background);
  padding: 0;
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: 32px;
  padding: 40px 20px;
  max-width: 1400px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .footer-content {
    flex-direction: row;
    justify-content: space-between;
  }
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-brand .logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--foreground);
}

.footer-brand .logo-icon {
  width: 24px;
  height: 24px;
  color: var(--primary);
}

.footer-brand .logo-text {
  font-size: 18px;
  font-weight: 700;
}

.footer-brand > p {
  font-size: 13px;
  color: var(--foreground-muted);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

@media (min-width: 640px) {
  .footer-links {
    grid-template-columns: repeat(3, 1fr);
    gap: 48px;
  }
}

.footer-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-section h4 {
  font-size: 13px;
  font-weight: 600;
  color: var(--foreground);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer-section a {
  font-size: 14px;
  color: var(--foreground-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-section a:hover {
  color: var(--primary);
}

.footer-bottom {
  padding: 16px 20px;
  border-top: 1px solid var(--border-subtle);
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--foreground-subtle);
}

/* Static Page Styles */
.page-content {
  max-width: 900px;
}

.page-hero {
  text-align: center;
  padding: 32px 0 24px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--foreground);
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

@media (min-width: 640px) {
  .page-title {
    font-size: 40px;
  }
}

.page-subtitle {
  font-size: 16px;
  color: var(--foreground-muted);
}

.content-card {
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
}

@media (min-width: 640px) {
  .content-card {
    padding: 40px;
  }
}

.content-section {
  margin-bottom: 32px;
}

.content-section:last-child {
  margin-bottom: 0;
}

.content-section h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--foreground);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.content-section h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--foreground);
  margin-bottom: 12px;
  margin-top: 20px;
}

.content-section p {
  font-size: 15px;
  color: var(--foreground-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.content-section ul,
.content-section ol {
  margin-left: 24px;
  margin-bottom: 16px;
}

.content-section li {
  font-size: 15px;
  color: var(--foreground-muted);
  line-height: 1.7;
  margin-bottom: 8px;
}

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

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

/* Feature Grid - About Page */
.feature-grid {
  display: grid;
  gap: 20px;
}

@media (min-width: 640px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.feature-item {
  background: var(--background);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
}

.feature-icon {
  width: 40px;
  height: 40px;
  background: rgba(59, 130, 246, 0.1);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
}

.feature-icon svg {
  width: 20px;
  height: 20px;
  color: var(--primary);
}

.feature-item h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--foreground);
  margin-bottom: 6px;
  margin-top: 0;
}

.feature-item p {
  font-size: 14px;
  color: var(--foreground-muted);
  line-height: 1.6;
  margin-bottom: 0;
}

/* Conversion Categories - About Page */
.conversion-categories {
  display: grid;
  gap: 20px;
}

@media (min-width: 768px) {
  .conversion-categories {
    grid-template-columns: repeat(2, 1fr);
  }
}

.category {
  background: var(--background);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
}

.category h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 12px;
  margin-top: 0;
}

.category ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.category li {
  font-size: 13px;
  color: var(--foreground-muted);
  padding: 4px 0;
  margin: 0;
}

.benefit-list {
  list-style: none;
  margin-left: 0 !important;
}

.benefit-list li {
  position: relative;
  padding-left: 24px;
}

.benefit-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
}

/* Contact Page */
.contact-methods {
  display: grid;
  gap: 20px;
}

@media (min-width: 640px) {
  .contact-methods {
    grid-template-columns: repeat(2, 1fr);
  }
}

.contact-method {
  background: var(--background);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  gap: 16px;
}

.contact-icon {
  width: 48px;
  height: 48px;
  background: rgba(59, 130, 246, 0.1);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-icon svg {
  width: 24px;
  height: 24px;
  color: var(--primary);
}

.contact-details h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--foreground);
  margin-bottom: 6px;
  margin-top: 0;
}

.contact-details p {
  font-size: 14px;
  color: var(--foreground-muted);
  margin-bottom: 12px;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--primary);
  text-decoration: none;
}

.contact-link:hover {
  text-decoration: underline;
}

.contact-link .icon {
  width: 14px;
  height: 14px;
}

/* FAQ */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--background);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
}

.faq-item h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--foreground);
  margin-bottom: 8px;
  margin-top: 0;
}

.faq-item p {
  font-size: 14px;
  color: var(--foreground-muted);
  line-height: 1.6;
  margin-bottom: 0;
}

/* Privacy Highlight */
.highlight-section {
  margin-bottom: 40px;
}

.privacy-highlight {
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.3);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.highlight-icon {
  width: 48px;
  height: 48px;
  background: rgba(34, 197, 94, 0.2);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.highlight-icon svg {
  width: 24px;
  height: 24px;
  color: var(--accent);
}

.highlight-content h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--foreground);
  margin-bottom: 6px;
  margin-top: 0;
}

.highlight-content p {
  font-size: 14px;
  color: var(--foreground-muted);
  line-height: 1.6;
  margin-bottom: 0;
}

.highlight-content strong {
  color: var(--foreground);
}

/* Legal Content */
.legal-content .content-section {
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.legal-content .content-section:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

/* Utility Classes */
.hidden {
  display: none !important;
}

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

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

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

::-webkit-scrollbar-thumb:hover {
  background: var(--foreground-subtle);
}

/* Focus Visible */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

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