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

:root {
  --bg-primary: #0F172A;
  --bg-secondary: #1E293B;
  --bg-tertiary: #334155;
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --accent: #22C55E;
  --accent-hover: #16A34A;
  --accent-dim: #14532D;
  --border: #1E293B;
  --border-light: #334155;
  --radius: 8px;
  --radius-sm: 4px;
  --font-ui: 'IBM Plex Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Cascadia Code', 'Fira Code', monospace;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-ui);
  line-height: 1.6;
  min-height: 100vh;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--accent);
}

.header-left h1 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.header-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid var(--accent);
  opacity: 0.8;
}

.layout {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.card-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.card-hint code {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.0625rem 0.25rem;
  border-radius: 2px;
  background: var(--bg-tertiary);
}

.input-area {
  width: 100%;
  min-height: 200px;
  padding: 0.75rem 1rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.7;
  resize: vertical;
  outline: none;
  transition: border-color 150ms ease;
}

.input-area:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.15);
}

.input-area::placeholder {
  color: var(--text-muted);
  opacity: 0.6;
}

.params-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

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

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

.field-input {
  padding: 0.5rem 0.75rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  outline: none;
  transition: border-color 150ms ease;
}

.field-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.15);
}

.field-input::placeholder {
  color: var(--text-muted);
  opacity: 0.5;
}

.field-note {
  font-size: 0.6875rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.field-note code {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  padding: 0.0625rem 0.25rem;
  border-radius: 2px;
  background: var(--bg-tertiary);
}

.actions-bar {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.output-area {
  width: 100%;
  min-height: 120px;
  max-height: 500px;
  padding: 1rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.7;
  overflow-x: auto;
  overflow-y: auto;
  white-space: pre;
  tab-size: 2;
}

.output-area:empty::before,
.output-area.is-empty::before {
  content: 'Paste domains above and click Generate';
  color: var(--text-muted);
  opacity: 0.5;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-ui);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 150ms ease, border-color 150ms ease, opacity 150ms ease;
  outline: none;
}

.btn:focus-visible {
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.3);
}

.btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  color: #0F172A;
  border-color: var(--accent);
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

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

.btn-secondary:hover:not(:disabled) {
  background: #475569;
  border-color: #64748B;
}

.footer {
  text-align: center;
  padding: 2rem 1.5rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: #0F172A;
  font-family: var(--font-ui);
  font-size: 0.8125rem;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms ease;
  z-index: 100;
}

.toast.show {
  opacity: 1;
}

.syntax-keyword {
  color: #38BDF8;
}

.syntax-domain {
  color: var(--accent);
}

.syntax-ip {
  color: #C084FC;
}

.syntax-comment {
  color: #64748B;
}

.syntax-meta {
  color: #FBBF24;
}

@media (max-width: 768px) {
  .layout {
    padding: 1.25rem 1rem 2rem;
  }

  .header {
    padding: 0.75rem 1rem;
  }

  .header-left h1 {
    font-size: 0.875rem;
  }

  .params-grid {
    grid-template-columns: 1fr;
  }

  .actions-bar {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0s !important;
    animation-duration: 0s !important;
  }
}