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

:root {
  --color-bg-primary: #0f172a;
  --color-bg-secondary: #1e293b;
  --color-bg-tertiary: #334155;
  --color-surface: rgba(255, 255, 255, 0.06);
  --color-surface-hover: rgba(255, 255, 255, 0.1);
  
  --color-text-primary: #f1f5f9;
  --color-text-secondary: #cbd5e1;
  --color-text-tertiary: #94a3b8;
  
  --color-brand-primary: #d946ef;
  --color-brand-secondary: #c026d3;
  --color-accent-pink: #ec4899;
  --color-accent-purple: #9333ea;
  
  --color-border: rgba(255, 255, 255, 0.12);
  --color-border-hover: rgba(255, 255, 255, 0.2);
  
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 30px rgba(217, 70, 239, 0.35);
  
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.app-header {
  position: relative;
  background: var(--color-bg-secondary);
  padding: var(--spacing-xl) 0;
  overflow: hidden;
}

.app-header::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -10%;
  width: 120%;
  height: 200%;
  background: 
    radial-gradient(circle at 10% 20%, rgba(217, 70, 239, 0.15), transparent 50%),
    radial-gradient(circle at 90% 30%, rgba(147, 51, 234, 0.15), transparent 50%),
    radial-gradient(circle at 50% 80%, rgba(236, 72, 153, 0.1), transparent 50%);
  animation: gradient-drift 20s ease-in-out infinite;
  pointer-events: none;
}

@keyframes gradient-drift {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-5%, -3%) scale(1.05); }
}

.header-content {
  position: relative;
  z-index: 1;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.brand-icon {
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--color-brand-primary), var(--color-accent-pink), var(--color-accent-purple));
  box-shadow: var(--shadow-glow);
  flex-shrink: 0;
}

.brand-title {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--color-text-primary);
  margin: 0;
}

.brand-subtitle {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
  margin: 0;
}

.app-main {
  padding: var(--spacing-2xl) 0;
  min-height: calc(100vh - 10rem);
}

.content-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(12px) saturate(1.2);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  overflow: hidden;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.card-body {
  padding: var(--spacing-lg);
}

.section-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin: 0;
}

.button-group {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  font-family: inherit;
}

.btn:focus-visible {
  outline: 2px solid var(--color-brand-primary);
  outline-offset: 2px;
}

.btn-sm {
  padding: 0.5rem 0.875rem;
  font-size: 0.8125rem;
}

.btn-primary {
  background: rgba(217, 70, 239, 0.2);
  color: #f0abfc;
  border-color: rgba(217, 70, 239, 0.4);
}

.btn-primary:hover {
  background: rgba(217, 70, 239, 0.3);
  border-color: rgba(217, 70, 239, 0.6);
  transform: translateY(-1px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--color-border-hover);
  transform: translateY(-1px);
}

.tokenizer-selector {
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-md);
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.tokenizer-dropdown {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.9375rem;
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  color: var(--color-text-primary);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  margin-bottom: var(--spacing-sm);
}

.tokenizer-dropdown:hover {
  border-color: var(--color-border-hover);
  background: var(--color-bg-tertiary);
}

.tokenizer-dropdown:focus {
  outline: none;
  border-color: rgba(217, 70, 239, 0.5);
  box-shadow: 0 0 0 3px rgba(217, 70, 239, 0.15);
}

.tokenizer-info {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  line-height: 1.5;
  font-style: italic;
}

.tokenizer-badge {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-primary);
  background: rgba(217, 70, 239, 0.2);
  border: 1px solid rgba(217, 70, 239, 0.4);
  border-radius: var(--radius-md);
  margin-left: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.text-input {
  width: 100%;
  min-height: 200px;
  padding: var(--spacing-md);
  font-size: 0.9375rem;
  font-family: 'Inter', sans-serif;
  color: var(--color-text-primary);
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  resize: vertical;
  transition: all var(--transition-base);
}

.text-input:focus {
  outline: none;
  border-color: rgba(217, 70, 239, 0.5);
  box-shadow: 0 0 0 3px rgba(217, 70, 239, 0.15);
}

.text-input::placeholder {
  color: var(--color-text-tertiary);
}

.controls-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.control-group {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
}

.control-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-tertiary);
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.slider-wrapper {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.range-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-accent-pink), var(--color-accent-purple));
  outline: none;
  cursor: pointer;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-bg-primary);
  border: 2px solid var(--color-brand-primary);
  box-shadow: 0 2px 8px rgba(217, 70, 239, 0.4);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.range-slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
  box-shadow: 0 4px 12px rgba(217, 70, 239, 0.6);
}

.range-slider::-webkit-slider-thumb:active {
  transform: scale(1.05);
}

.range-slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-bg-primary);
  border: 2px solid var(--color-brand-primary);
  box-shadow: 0 2px 8px rgba(217, 70, 239, 0.4);
  cursor: pointer;
}

.range-slider::-moz-range-track {
  height: 6px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-accent-pink), var(--color-accent-purple));
}

.slider-value {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text-primary);
  min-width: 2rem;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.checkbox-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  user-select: none;
}

.checkbox-input {
  width: 1.125rem;
  height: 1.125rem;
  cursor: pointer;
  accent-color: var(--color-brand-primary);
}

.checkbox-label {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  text-align: center;
  transition: all var(--transition-base);
}

.stat-card:hover {
  background: var(--color-surface-hover);
  transform: translateY(-2px);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text-primary);
  font-variant-numeric: tabular-nums;
}

.tokens-container {
  margin-bottom: var(--spacing-lg);
}

.tokens-wrap,
.vocab-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  max-height: 18rem;
  overflow-y: auto;
  padding: var(--spacing-sm);
  background: rgba(15, 23, 42, 0.5);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.vocab-section {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.vocab-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.vocab-wrap {
  max-height: 12rem;
}

.token-chip {
  display: inline-flex;
  align-items: center;
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: default;
  line-height: 1.4;
  word-break: break-word;
}

.token-chip:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.tokens-wrap::-webkit-scrollbar,
.vocab-wrap::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.tokens-wrap::-webkit-scrollbar-track,
.vocab-wrap::-webkit-scrollbar-track {
  background: transparent;
}

.tokens-wrap::-webkit-scrollbar-thumb,
.vocab-wrap::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.3);
  border-radius: 999px;
}

.tokens-wrap::-webkit-scrollbar-thumb:hover,
.vocab-wrap::-webkit-scrollbar-thumb:hover {
  background: rgba(148, 163, 184, 0.5);
}

@media (min-width: 768px) {
  .brand-title {
    font-size: 2rem;
  }
  
  .controls-grid {
    grid-template-columns: 2fr 1fr;
  }
  
  .slider-control {
    grid-column: span 1;
  }
  
  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .content-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .card-body {
    padding: var(--spacing-xl);
  }
  
  .card-header {
    padding: var(--spacing-xl);
  }
}

@media (min-width: 1440px) {
  .container {
    padding: 0 var(--spacing-2xl);
  }
  
  .brand-title {
    font-size: 2.25rem;
  }
}

@media (max-width: 767px) {
  .app-header {
    padding: var(--spacing-lg) 0;
  }
  
  .brand-icon {
    width: 2.5rem;
    height: 2.5rem;
  }
  
  .brand-title {
    font-size: 1.5rem;
  }
  
  .brand-subtitle {
    font-size: 0.8125rem;
  }
  
  .app-main {
    padding: var(--spacing-lg) 0;
  }
  
  .content-grid {
    gap: var(--spacing-lg);
  }
  
  .card-header,
  .card-body {
    padding: var(--spacing-md);
  }
  
  .section-title {
    font-size: 1rem;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }
  
  .tokenizer-badge {
    margin-left: 0;
  }
  
  .button-group {
    width: 100%;
  }
  
  .btn-sm {
    flex: 1;
    min-width: 0;
  }
  
  .tokenizer-selector {
    padding: var(--spacing-sm);
  }
  
  .tokenizer-dropdown {
    font-size: 1rem; 
  }
  
  .tokenizer-info {
    font-size: 0.75rem;
  }
  
  .text-input {
    font-size: 1rem;
    min-height: 150px;
  }
  
  .controls-grid {
    gap: var(--spacing-sm);
  }
  
  .control-group {
    padding: var(--spacing-sm);
  }
  
  .stat-value {
    font-size: 1.5rem;
  }
  
  .tokens-wrap,
  .vocab-wrap {
    max-height: 14rem;
  }
}

@media (max-width: 380px) {
  .brand-title {
    font-size: 1.25rem;
  }
  
  .brand-subtitle {
    font-size: 0.75rem;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .token-chip {
    font-size: 0.8125rem;
    padding: 0.25rem 0.625rem;
  }
  
  .tokenizer-dropdown {
    font-size: 0.875rem;
    padding: 0.5rem;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .content-grid {
    grid-template-columns: 1fr;
  }
  
  .controls-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (hover: none) and (pointer: coarse) {
  .btn {
    min-height: 44px;
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .checkbox-input {
    width: 1.5rem;
    height: 1.5rem;
  }
  
  .range-slider {
    height: 8px;
  }
  
  .range-slider::-webkit-slider-thumb {
    width: 24px;
    height: 24px;
  }
  
  .range-slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
  }
}