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

:root {
  --bg: #f8f9fa;
  --surface: #ffffff;
  --border: #dee2e6;
  --text: #212529;
  --text-muted: #6c757d;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #eff6ff;
  --success: #059669;
  --mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', 'Courier New', monospace;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 640px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 0.25rem;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.section-header label {
  font-weight: 600;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

textarea {
  width: 100%;
  min-height: 280px;
  padding: 0.875rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: var(--mono);
  font-size: 0.8125rem;
  line-height: 1.5;
  resize: vertical;
  background: var(--surface);
  color: var(--text);
  transition: border-color 0.15s;
}

textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

textarea::placeholder {
  color: var(--text-muted);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 0.875rem;
}

.options {
  display: flex;
  gap: 1.25rem;
  margin: 0.75rem 0;
  flex-wrap: wrap;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  cursor: pointer;
  user-select: none;
}

.checkbox-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}

.btn-primary {
  display: block;
  width: 100%;
  padding: 0.7rem 1.5rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

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

.btn-primary:active {
  transform: scale(0.99);
}

.btn-text {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  padding: 0;
}

.btn-text:hover {
  text-decoration: underline;
}

.output-section {
  margin-top: 1.5rem;
}

.domain-list {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 0.875rem;
  font-family: var(--mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  max-height: 400px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

.stats-panel {
  margin-top: 1rem;
  background: var(--accent-light);
  border-radius: 8px;
  padding: 0.875rem;
  font-size: 0.8125rem;
}

.stat-row {
  display: flex;
  justify-content: flex-start;
  gap: 0.5rem;
  padding: 0.2rem 0;
  flex-wrap: wrap;
}

.stat-row:empty {
  display: none;
}

.stat-row .stat-value {
  flex-shrink: 0;
}

.stat-detail {
  color: var(--text-muted);
}

.stat-label {
  color: var(--text-muted);
}

.stat-value {
  font-weight: 600;
}

.stat-value.success {
  color: var(--success);
}

.tld-breakdown {
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}

.tld-breakdown:empty {
  display: none;
}

.tld-breakdown h4 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.tld-inline {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.75rem;
}

.tld-tag {
  font-family: var(--mono);
  white-space: nowrap;
}

.copied-toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: #fff;
  padding: 0.5rem 1.25rem;
  border-radius: 6px;
  font-size: 0.8125rem;
  font-weight: 500;
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
  z-index: 100;
}

.copied-toast.show {
  opacity: 1;
}