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

:root {
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --secondary: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-600: #4b5563;
  --gray-800: #1f2937;
  --gray-900: #111827;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto",
    sans-serif;
  background: linear-gradient(to bottom, #f0f9ff 0%, #ffffff 100%);
  min-height: 100vh;
  padding: 0;
  line-height: 1.6;
  color: var(--gray-900);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px;
}

header {
  text-align: center;
  padding: 40px 20px 30px;
  margin-bottom: 30px;
}

.brand {
  margin-bottom: 10px;
}

h1 {
  font-size: 42px;
  font-weight: 700;
  color: var(--primary);
  margin: 0;
  letter-spacing: -0.5px;
}

.domain {
  display: block;
  font-size: 14px;
  color: var(--gray-600);
  font-weight: 500;
  margin-top: 5px;
}

.subtitle {
  color: var(--gray-600);
  font-size: 16px;
  margin: 0;
}

main {
  background: white;
  padding: 0;
  border-radius: 12px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -1px rgba(0, 0, 0, 0.06);
  overflow: hidden;
}

.search-box {
  background: linear-gradient(
    135deg,
    var(--primary) 0%,
    var(--primary-dark) 100%
  );
  padding: 40px 30px;
}

#dns-form {
  max-width: 900px;
  margin: 0 auto;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 12px;
  align-items: center;
}

#domain-input {
  padding: 16px 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 8px;
  font-size: 16px;
  background: rgba(255, 255, 255, 0.95);
  transition: all 0.3s ease;
}

#domain-input:focus {
  outline: none;
  border-color: white;
  background: white;
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.2);
}

.record-select {
  padding: 16px 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 8px;
  font-size: 15px;
  background: rgba(255, 255, 255, 0.95);
  cursor: pointer;
  min-width: 200px;
  font-weight: 500;
  color: var(--gray-800);
}

.record-select:focus {
  outline: none;
  border-color: white;
  background: white;
}

.btn-resolve {
  padding: 16px 32px;
  background: white;
  color: var(--primary);
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.3s ease;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn-resolve:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.btn-resolve:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-icon {
  font-size: 18px;
}

.quick-examples {
  padding: 25px 30px;
  background: var(--gray-50);
  border-top: 1px solid var(--gray-200);
}

.examples-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-600);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.examples-grid {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.example-chip {
  padding: 10px 18px;
  background: white;
  border: 2px solid var(--gray-300);
  border-radius: 20px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-700);
  transition: all 0.2s ease;
}

.example-chip:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2);
}

#results {
  padding: 30px;
  min-height: 200px;
}

.result-card {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
}

.result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid #ddd;
}

.result-type {
  font-weight: 600;
  color: #333;
}

.status {
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 13px;
  font-weight: 500;
}

.status.success {
  background: #d4edda;
  color: #155724;
}

.status.error {
  background: #f8d7da;
  color: #721c24;
}

.records {
  margin-top: 10px;
}

.record {
  background: white;
  padding: 10px;
  border-left: 3px solid #4a90e2;
  margin-bottom: 8px;
  border-radius: 4px;
  font-family: monospace;
  font-size: 14px;
  word-break: break-all;
}

.error-msg {
  color: #721c24;
  background: #f8d7da;
  padding: 10px;
  border-radius: 4px;
  font-size: 14px;
}

.meta {
  margin-top: 10px;
  font-size: 13px;
  color: #666;
}

.main-footer {
  margin-top: 60px;
  padding: 30px 20px;
  text-align: center;
  border-top: 1px solid var(--gray-200);
  background: var(--gray-50);
}

.footer-content p {
  margin: 5px 0;
  color: var(--gray-600);
  font-size: 14px;
}

.footer-content a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
}

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

.footer-note {
  font-size: 13px;
  color: var(--gray-500);
}

.seo-keywords {
  margin-top: 15px;
  padding-top: 15px;
  border-top: 1px solid var(--gray-200);
}

.seo-keywords p {
  color: var(--gray-500);
  line-height: 1.4;
}

.loading {
  text-align: center;
  padding: 60px 20px;
  color: var(--gray-600);
}

.spinner {
  width: 50px;
  height: 50px;
  margin: 0 auto 20px;
  border: 4px solid var(--gray-200);
  border-top: 4px solid var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

.loading p {
  font-size: 16px;
  font-weight: 500;
}

/* Table Styles */
.table-container {
  overflow-x: auto;
  margin-top: 15px;
}

.dns-table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  font-size: 14px;
}

.dns-table thead {
  background: #f5f5f5;
}

.dns-table th {
  padding: 12px;
  text-align: left;
  font-weight: 600;
  color: #333;
  border-bottom: 2px solid #ddd;
}

.dns-table td {
  padding: 12px;
  border-bottom: 1px solid #eee;
  vertical-align: top;
}

.dns-table tr:hover {
  background: #f9f9f9;
}

.dns-table .answer {
  font-family: monospace;
  color: #0066cc;
  word-break: break-all;
}

.type-badge {
  display: inline-block;
  padding: 4px 8px;
  background: #4a90e2;
  color: white;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
}

.no-data {
  text-align: center;
  color: #666;
  font-style: italic;
  padding: 20px !important;
}

/* Trace Section */
.trace-section {
  background: #f9f9f9;
  border: 1px solid #ddd;
  border-radius: 6px;
  padding: 15px;
  margin-bottom: 20px;
}

.trace-section h4 {
  margin: 0 0 15px 0;
  color: #333;
  font-size: 16px;
}

.trace-item {
  padding: 4px 8px;
  margin-bottom: 2px;
  background: transparent;
  border-left: none;
  border-radius: 0;
  font-size: 13px;
  font-family: "Consolas", "Monaco", monospace;
  line-height: 1.5;
  color: #333;
}

.trace-item.success {
  border-left: none;
  background: transparent;
}

.trace-item.failed {
  border-left: none;
  background: #fff0f0;
  color: #d00;
}

.trace-icon {
  display: none; /* Hide icon for pure log look */
}

.trace-error {
  color: #dc3545;
  font-weight: bold;
}

/* Nameserver Section */
.nameserver-section {
  margin-top: 20px;
  background: #f9f9f9;
  border: 1px solid #ddd;
  border-radius: 6px;
  padding: 15px;
}

.nameserver-section h4 {
  margin: 0 0 15px 0;
  color: #333;
  font-size: 16px;
}

/* Info Footer */
.info-footer {
  margin-top: 20px;
  padding: 15px;
  background: #fffbf0;
  border-left: 4px solid #ffc107;
  border-radius: 4px;
  font-size: 13px;
  color: #666;
}

.info-footer p {
  margin: 5px 0;
}

.info-footer em {
  font-style: italic;
}

@media (max-width: 768px) {
  h1 {
    font-size: 32px;
  }

  .search-box {
    padding: 30px 20px;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .record-select {
    min-width: 100%;
  }

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

  #results {
    padding: 20px;
  }

  .trace-item {
    font-size: 12px;
  }

  .dns-table {
    font-size: 13px;
  }

  .dns-table th,
  .dns-table td {
    padding: 10px 8px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 10px;
  }

  h1 {
    font-size: 28px;
  }

  header {
    padding: 30px 15px 20px;
  }

  .search-box {
    padding: 25px 15px;
  }

  .quick-examples {
    padding: 20px 15px;
  }
}

#results {
  padding: 20px;
  border: 1px solid #ccc;
  border-radius: 5px;
}