/* ===================================
   DNS Checker - Complete Stylesheet
   =================================== */

/* === CSS Variables === */
:root {
  --color-primary: #007bff;
  --color-primary-dark: #0056b3;
  --color-success: #28a745;
  --color-warning: #ffc107;
  --color-danger: #dc3545;
  --color-info: #17a2b8;
  --color-text: #333;
  --color-text-light: #666;
  --color-bg: #f8f9fa;
  --color-white: #ffffff;
  --color-border: #dee2e6;
  --color-shadow: rgba(0, 0, 0, 0.1);
  
  --spacing-xs: 8px;
  --spacing-sm: 12px;
  --spacing-md: 20px;
  --spacing-lg: 30px;
  --spacing-xl: 40px;
  
  --border-radius: 8px;
  --border-radius-sm: 5px;
  --border-radius-lg: 12px;
  
  --transition: all 0.3s ease;
  --shadow-sm: 0 2px 4px var(--color-shadow);
  --shadow-md: 0 4px 8px var(--color-shadow);
  --shadow-lg: 0 8px 16px var(--color-shadow);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding: var(--spacing-md);
}

/* === Language Switcher === */
.lang-switcher {
  position: fixed;
  top: 20px;
  right: 20px;
  display: flex;
  gap: 0;
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  z-index: 1000;
}

.lang-btn {
  background: var(--color-white);
  border: none;
  padding: 8px 16px;
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  color: var(--color-text-light);
  transition: var(--transition);
  border-right: 1px solid var(--color-border);
}

.lang-btn:last-child {
  border-right: none;
}

.lang-btn:hover {
  background: var(--color-bg);
}

.lang-btn.active {
  background: var(--color-primary);
  color: var(--color-white);
}

/* === Container === */
.container {
  max-width: 800px;
  margin: 0 auto;
  background: var(--color-white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-xl);
  animation: fadeInUp 0.5s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* === Header === */
.header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.header h1 {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-xs);
}

.header .beta-badge {
  display: block;
  margin: var(--spacing-xs) auto var(--spacing-sm) auto;
  width: fit-content;
}

.subtitle {
  font-size: 16px;
  color: var(--color-text-light);
}

/* === Mode Selector === */
.mode-selector {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.mode-option {
  position: relative;
  cursor: pointer;
}

.mode-option input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.mode-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--spacing-md);
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  transition: var(--transition);
  min-height: 140px;
  justify-content: center;
}

.mode-option:hover .mode-content {
  border-color: var(--color-primary);
  background: rgba(0, 123, 255, 0.05);
}

.mode-option input[type="radio"]:checked + .mode-content {
  border-color: var(--color-primary);
  background: rgba(0, 123, 255, 0.1);
  box-shadow: var(--shadow-md);
}

.mode-icon {
  font-size: 36px;
  margin-bottom: var(--spacing-sm);
}

.mode-title {
  display: block;
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-xs);
}

.mode-hint {
  display: block;
  font-size: 14px;
  color: var(--color-text-light);
}

/* === Input Instruction === */
.input-instruction {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
  text-align: center;
  font-size: 14px;
  animation: fadeIn 0.3s ease-out;
}

.input-instruction .tip {
  margin-top: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: #fff3cd;
  border-left: 3px solid #ffc107;
  border-radius: var(--border-radius-sm);
  font-size: 13px;
  color: #856404;
  font-weight: 500;
  display: inline-block;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* === Input Group === */
.input-group {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

#domainInput {
  flex: 1;
  padding: 14px 18px;
  font-size: 16px;
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  transition: var(--transition);
  font-family: 'Courier New', monospace;
}

#domainInput:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

#domainInput::placeholder {
  color: #aaa;
}

.btn-primary {
  padding: 14px 32px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-white);
  background: var(--color-primary);
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  background: #ccc;
  cursor: not-allowed;
  transform: none;
}

/* === Results Container === */
#resultsContainer {
  min-height: 50px;
}

#resultsContainer > * {
  animation: fadeInUp 0.4s ease-out;
}

/* === Message Boxes === */
.message {
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-md);
  border-left: 4px solid;
  font-size: 15px;
  line-height: 1.6;
}

.message strong {
  font-weight: 700;
}

.message.success {
  background: #d4edda;
  border-color: var(--color-success);
  color: #155724;
}

.message.failure {
  background: #f8d7da;
  border-color: var(--color-danger);
  color: #721c24;
}

.message.warning {
  background: #fff3cd;
  border-color: var(--color-warning);
  color: #856404;
}

.message.info {
  background: #d1ecf1;
  border-color: var(--color-info);
  color: #0c5460;
}

.message.critical {
  background: #f8d7da;
  border-color: var(--color-danger);
  color: #721c24;
  border-left-width: 6px;
  font-weight: 600;
}

/* === Spinner === */
.spinner {
  border: 4px solid rgba(0, 0, 0, 0.1);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border-left-color: var(--color-primary);
  animation: spin 1s ease infinite;
  margin: var(--spacing-xl) auto;
}

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

/* === Results Section === */
.results-section {
  margin-bottom: var(--spacing-lg);
}

.results-section h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-border);
}

/* === Tables === */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--spacing-md);
  background: var(--color-white);
  border-radius: var(--border-radius);
  overflow: visible;
  box-shadow: var(--shadow-sm);
}

thead {
  background: var(--color-bg);
}

th {
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  font-size: 14px;
  color: var(--color-text);
  border-bottom: 2px solid var(--color-border);
  position: relative;
}

th[data-tooltip] {
  cursor: help;
}

/* Tooltips */
th[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  background: #333;
  color: var(--color-white);
  padding: 8px 12px;
  border-radius: var(--border-radius-sm);
  font-size: 12px;
  font-weight: normal;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s, visibility 0.2s, transform 0.2s;
  z-index: 100;
  pointer-events: none;
}

th[data-tooltip]:hover::after {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(-4px);
}

td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
}

tr:last-child td {
  border-bottom: none;
}

/* Row color coding */
tr.row-correct {
  background: #d4edda;
  border-left: 4px solid var(--color-success);
}

tr.row-correct td {
  color: #155724;
}

tr.row-remove {
  background: #f8d7da;
  border-left: 4px solid var(--color-danger);
}

tr.row-remove td {
  color: #721c24;
}

tr.row-info {
  background: #fff3cd;
  border-left: 4px solid var(--color-warning);
}

tr.row-info td {
  color: #856404;
}

/* Legacy class for backwards compatibility */
tr.to-remove {
  background: #f8d7da;
  border-left: 4px solid var(--color-danger);
}

tr.to-remove td {
  color: #721c24;
}

/* Row hover effect */
tbody tr {
  transition: var(--transition);
  cursor: help;
  position: relative;
}

tbody tr:hover {
  transform: scale(1.01);
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  z-index: 10;
}

/* Row tooltips */
tbody tr[data-tooltip] {
  position: relative;
}

tbody tr[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  background: #333;
  color: var(--color-white);
  padding: 12px 16px;
  border-radius: var(--border-radius);
  font-size: 13px;
  font-weight: normal;
  line-height: 1.4;
  max-width: 400px;
  width: max-content;
  white-space: normal;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s, transform 0.3s;
  z-index: 1000;
  pointer-events: none;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

tbody tr[data-tooltip]:hover::after {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(-4px);
}

/* Action cell styling */
.action-cell {
  font-weight: 600;
  font-size: 13px;
}

/* === Copy Button === */
.copy-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  margin-left: 8px;
  opacity: 0.6;
  transition: var(--transition);
  vertical-align: middle;
}

.copy-btn:hover {
  opacity: 1;
}

.copy-btn svg {
  width: 16px;
  height: 16px;
  display: block;
}

.copy-btn.copied {
  opacity: 1;
}

.copy-btn.copied svg path {
  stroke: var(--color-success);
}

/* === Instructions Section === */
.instructions {
  background: linear-gradient(135deg, #e8f5e9 0%, #f1f8f4 100%);
  border-left: 4px solid var(--color-success);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin-top: var(--spacing-lg);
  box-shadow: 0 2px 8px rgba(40, 167, 69, 0.1);
}

.instructions h4 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
}

.instructions p {
  margin-bottom: var(--spacing-sm);
  line-height: 1.6;
}

.instructions .target-ip {
  display: flex;
  gap: var(--spacing-sm);
  margin: var(--spacing-md) 0;
}

.instructions .target-ip input {
  flex: 1;
  padding: 10px 14px;
  font-size: 16px;
  font-weight: 700;
  font-family: 'Courier New', monospace;
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  background: var(--color-white);
}

.instructions .target-ip button {
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-white);
  background: var(--color-primary);
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
}

.instructions .target-ip button:hover {
  background: var(--color-primary-dark);
}

.instructions hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--spacing-md) 0;
}

.instructions a {
  display: inline-block;
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-white);
  border-radius: var(--border-radius);
  transition: var(--transition);
  margin-top: var(--spacing-sm);
}

.instructions a:hover {
  background: var(--color-primary);
  color: var(--color-white);
  transform: translateX(4px);
}

.instructions ul {
  list-style: none;
  margin: var(--spacing-md) 0;
  padding-left: 0;
}

.instructions ul li {
  padding-left: 24px;
  margin-bottom: var(--spacing-sm);
  position: relative;
}

.instructions ul li::before {
  content: '•';
  position: absolute;
  left: 8px;
  color: var(--color-primary);
  font-weight: bold;
  font-size: 18px;
}

.dns-propagation-notice {
  background: #e7f3ff;
  border-left: 4px solid var(--color-info);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin-top: var(--spacing-md);
}

.dns-propagation-notice p {
  margin: 0;
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.6;
}

/* === Issue List === */
.issue-list {
  list-style: none;
  margin: var(--spacing-md) 0;
}

.issue-item {
  padding: var(--spacing-sm) var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  border-left: 4px solid;
  border-radius: var(--border-radius-sm);
  background: var(--color-white);
}

.issue-item.critical {
  border-color: var(--color-danger);
  background: #fff5f5;
}

.issue-item.warning {
  border-color: var(--color-warning);
  background: #fffef5;
}

.issue-item.info {
  border-color: var(--color-info);
  background: #f5fbff;
}

/* === Responsive Design === */
@media (max-width: 768px) {
  body {
    padding: var(--spacing-sm);
  }
  
  .container {
    padding: var(--spacing-md);
  }
  
  .header h1 {
    font-size: 24px;
  }
  
  .lang-switcher {
    top: 10px;
    right: 10px;
  }
  
  .mode-selector {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }
  
  .input-group {
    flex-direction: column;
  }
  
  .btn-primary {
    width: 100%;
  }
  
  table {
    font-size: 13px;
  }
  
  th, td {
    padding: 8px 10px;
  }
  
  th[data-tooltip]::after {
    left: 0;
    transform: translateX(0) translateY(-8px);
  }
  
  th[data-tooltip]:hover::after {
    transform: translateX(0) translateY(-4px);
  }
}

@media (max-width: 480px) {
  .header h1 {
    font-size: 20px;
  }
  
  .subtitle {
    font-size: 14px;
  }
  
  .mode-content {
    min-height: 120px;
    padding: var(--spacing-sm);
  }
  
  .mode-icon {
    font-size: 28px;
  }
  
  .mode-title {
    font-size: 16px;
  }
  
  .mode-hint {
    font-size: 12px;
  }
  
  table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

/* === Message Info Style === */
.message.info {
  background-color: #e3f2fd;
  border-left: 4px solid #2196f3;
  color: #0d47a1;
}

.message.info strong {
  font-weight: 600;
  color: #01579b;
}

/* === Beta Badge === */
.beta-badge {
  display: inline-block;
  background: linear-gradient(135deg, #ffd700, #ffed4e);
  color: #333;
  font-size: 0.5em;
  font-weight: 700;
  padding: 0.3em 0.6em;
  border-radius: 4px;
  margin-left: 0.5em;
  vertical-align: middle;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* === Print Styles === */
@media print {
  body {
    background: white;
  }
  
  .lang-switcher,
  .input-group,
  .btn-primary {
    display: none;
  }
  
  .container {
    box-shadow: none;
  }
}