:root {
  --primary: #0066cc;
  --primary-dark: #0052a3;
  --primary-light: #e6f2ff;
  --success: #00a854;
  --warning: #ff9c00;
  --danger: #ff4d4f;
  --bg: #f9fafb;
  --bg-dark: #1f2937;
  --text: #1f2937;
  --text-light: #6b7280;
  --border: #e5e7eb;
  --white: #ffffff;
  
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  
  --radius: 8px;
  --radius-lg: 12px;
  
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* NAVBAR */
.navbar {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
}

.logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  transition: color 0.3s;
}

.logo:hover {
  color: var(--primary-dark);
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-links a {
  color: var(--text-light);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.3s;
}

.nav-links a:hover {
  color: var(--primary);
}

@media (max-width: 768px) {
  .nav-links {
    gap: var(--spacing-md);
    font-size: 13px;
  }
}

/* HERO SECTION */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--white);
  padding: var(--spacing-2xl) 0;
  text-align: center;
}

.hero h1 {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
}

.hero .subtitle {
  font-size: 18px;
  margin-bottom: var(--spacing-2xl);
  opacity: 0.95;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.search-box {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-2xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.search-box input {
  flex: 1;
  padding: 14px var(--spacing-md);
  border: none;
  border-radius: var(--radius);
  font-size: 16px;
  transition: box-shadow 0.3s;
}

.search-box input:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.2);
}

.btn-primary {
  background: var(--primary);
  color: var(--white);
  border: none;
  padding: 14px var(--spacing-lg);
  border-radius: var(--radius);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 16px;
  white-space: nowrap;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

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

.quick-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-lg);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  margin-top: var(--spacing-xl);
}

.stat {
  background: rgba(255, 255, 255, 0.1);
  padding: var(--spacing-md);
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
}

.stat strong {
  font-size: 24px;
  display: block;
  margin-bottom: var(--spacing-xs);
}

.stat span {
  font-size: 13px;
  opacity: 0.9;
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 32px;
  }
  
  .hero .subtitle {
    font-size: 16px;
  }
  
  .search-box {
    flex-direction: column;
  }
  
  .btn-primary {
    width: 100%;
    justify-content: center;
  }
}

/* MAIN SECTIONS */
main {
  padding: var(--spacing-2xl) 0;
}

section {
  margin-bottom: var(--spacing-2xl);
}

h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  color: var(--text);
}

h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
}

h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

/* TOOL SECTION */
.tool-section {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.tool-wrapper {
  margin-top: var(--spacing-lg);
}

.input-group {
  margin-bottom: var(--spacing-lg);
}

.input-group label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
  color: var(--text);
}

select {
  width: 100%;
  padding: 12px var(--spacing-md);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
  transition: border-color 0.3s, box-shadow 0.3s;
  background: var(--white);
}

select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

/* LOADING SPINNER */
.spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl);
}

.spin {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: var(--spacing-md);
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* RESULTS */
#results-container {
  margin-top: var(--spacing-xl);
  background: var(--primary-light);
  padding: var(--spacing-lg);
  border-radius: var(--radius);
  border: 1px solid #cce5ff;
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.results-header h3 {
  margin: 0;
}

.results-header span {
  color: var(--primary);
  font-family: 'Monaco', 'Courier New', monospace;
  font-weight: 600;
}

.result-actions {
  display: flex;
  gap: var(--spacing-sm);
}

.btn-secondary {
  background: var(--white);
  color: var(--primary);
  border: 1px solid var(--primary);
  padding: 10px var(--spacing-md);
  border-radius: var(--radius);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s;
  font-size: 13px;
}

.btn-secondary:hover {
  background: var(--primary);
  color: var(--white);
  transform: translateY(-2px);
}

/* ============================================
   ANALYSIS ALERT STYLES (NEW LAYER)
   ============================================ */

.analysis-alert {
  background: linear-gradient(135deg, #f0f9ff 0%, #f5f3ff 100%);
  border: 1px solid #bfdbfe;
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 20px;
  font-size: 14px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.analysis-alert.alert-info {
  background: linear-gradient(135deg, #f0fdf4 0%, #f0f9ff 100%);
  border-color: #86efac;
}

.analysis-alert.alert-warning {
  background: linear-gradient(135deg, #fef3c7 0%, #fef08a 100%);
  border-color: #fde047;
}

.analysis-alert.alert-error {
  background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
  border-color: #fca5a5;
}

/* Email & Security Status Indicators */
.status-good {
  color: #16a34a;
  font-weight: 500;
}

.status-warning {
  color: #f97316;
  font-weight: 500;
}

.status-error {
  color: #dc2626;
  font-weight: 500;
}

/* Change Detection Alert */
.change-badge {
  display: inline-block;
  background: #dbeafe;
  color: #0369a1;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  margin-left: 8px;
}

.change-badge.added {
  background: #dcfce7;
  color: #166534;
}

.change-badge.removed {
  background: #fee2e2;
  color: #991b1b;
}

/* ============================================
   RECORDS GRID & TYPES
   ============================================ */

.records-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-lg);
}

.record-type {
  background: var(--white);
  padding: var(--spacing-lg);
  border-radius: var(--radius);
  border-left: 4px solid var(--primary);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.record-type.soa-records {
  border-left-color: #7c3aed;
}

.record-type.caa-records {
  border-left-color: #ec4899;
}

.record-type.ptr-records {
  border-left-color: #06b6d4;
}

.record-title {
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--primary);
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border);
}

.record-type.soa-records .record-title {
  color: #7c3aed;
}

.record-type.caa-records .record-title {
  color: #ec4899;
}

.record-type.ptr-records .record-title {
  color: #06b6d4;
}

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

.record-item {
  background: var(--bg);
  padding: var(--spacing-md);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-family: 'Monaco', 'Courier New', monospace;
  font-size: 13px;
  line-height: 1.5;
  word-break: break-all;
  transition: all 0.3s;
  border-left: 3px solid var(--primary);
}

.record-item:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  box-shadow: 0 2px 4px rgba(0, 102, 204, 0.1);
}

.record-item.new {
  border-left-color: #16a34a;
}

.record-item.new::before {
  content: '✓ NEW ';
  color: #16a34a;
  font-weight: 600;
  font-size: 11px;
  margin-right: 4px;
}

.record-item.removed {
  border-left-color: #dc2626;
  opacity: 0.7;
}

.record-item.removed::before {
  content: '✗ REMOVED ';
  color: #dc2626;
  font-weight: 600;
  font-size: 11px;
  margin-right: 4px;
}

/* MX Item Special Styling */
.record-item.mx-item {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: var(--spacing-md);
}

.mx-priority {
  background: var(--primary);
  color: white;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 14px;
  flex-shrink: 0;
  grid-column: 1;
  grid-row: 1 / 3;
}

/* INFO GRID */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.info-card {
  background: var(--white);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  transition: all 0.3s;
}

.info-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
  transform: translateY(-4px);
}

.info-card h3 {
  color: var(--primary);
  margin-bottom: var(--spacing-md);
}

.info-card p {
  color: var(--text-light);
  margin-bottom: var(--spacing-sm);
  line-height: 1.7;
}

.info-card code {
  background: var(--bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Monaco', monospace;
  font-size: 12px;
  color: var(--primary);
}

.use-case {
  font-weight: 500;
  color: var(--text);
}

/* STEPS */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.step {
  background: var(--white);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  display: flex;
  gap: var(--spacing-lg);
  border: 1px solid var(--border);
  transition: all 0.3s;
}

.step:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.step-number {
  background: var(--primary);
  color: var(--white);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 20px;
  flex-shrink: 0;
}

.step h3 {
  margin-top: 0;
  margin-bottom: var(--spacing-sm);
}

.step p {
  color: var(--text-light);
  margin: 0;
}

/* USE CASES */
.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.use-case {
  background: var(--white);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  transition: all 0.3s;
}

.use-case:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.use-case h3 {
  color: var(--primary);
  margin-bottom: var(--spacing-md);
  margin-top: 0;
}

.use-case p {
  color: var(--text-light);
  margin: 0;
}

/* FAQ */
.faq-grid {
  display: grid;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.faq-item {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  cursor: pointer;
  transition: all 0.3s;
}

.faq-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.faq-item summary {
  list-style: none;
  user-select: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary h3 {
  margin: 0;
  color: var(--primary);
  position: relative;
  padding-right: var(--spacing-lg);
}

.faq-item summary h3::after {
  content: '+';
  position: absolute;
  right: 0;
  font-weight: 700;
  font-size: 24px;
  transition: transform 0.3s;
}

.faq-item[open] summary h3::after {
  transform: rotate(45deg);
  content: '−';
  font-size: 28px;
}

.faq-item p {
  margin: var(--spacing-md) 0 0 0;
  color: var(--text-light);
  line-height: 1.7;
}

/* HISTORY */
.history-section {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.history-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  min-height: 60px;
}

.history-item {
  background: var(--bg);
  padding: var(--spacing-md);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.3s;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.history-item:hover {
  background: var(--primary-light);
  border-color: var(--primary);
}

.history-item-domain {
  font-weight: 500;
  color: var(--primary);
  font-family: monospace;
}

.history-item-time {
  font-size: 12px;
  color: var(--text-light);
}

.history-item .delete-btn {
  background: transparent;
  color: var(--danger);
  border: none;
  cursor: pointer;
  padding: 4px;
  transition: transform 0.3s;
}

.history-item .delete-btn:hover {
  transform: scale(1.2);
}

/* ALERTS */
.alert {
  padding: var(--spacing-lg);
  border-radius: var(--radius);
  margin-top: var(--spacing-lg);
}

.alert-error {
  background: #fee;
  border: 1px solid #fcc;
  color: var(--danger);
}

.alert-success {
  background: #f0fdf4;
  border: 1px solid #dcfce7;
  color: var(--success);
}

/* FOOTER */
.footer {
  background: var(--bg-dark);
  color: #d1d5db;
  padding: var(--spacing-2xl) 0;
  margin-top: var(--spacing-2xl);
  text-align: center;
}

.footer p {
  margin: var(--spacing-sm) 0;
  font-size: 14px;
}

/* RESPONSIVE */
@media (max-width: 768px) {
  h2 {
    font-size: 24px;
  }
  
  h3 {
    font-size: 18px;
  }
  
  .records-grid {
    grid-template-columns: 1fr;
  }
  
  .info-grid {
    grid-template-columns: 1fr;
  }
  
  .steps {
    grid-template-columns: 1fr;
  }
  
  .use-cases-grid {
    grid-template-columns: 1fr;
  }
  
  .results-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .result-actions {
    width: 100%;
    flex-wrap: wrap;
  }
  
  .btn-secondary {
    flex: 1;
    min-width: 100px;
  }
  
  main {
    padding: var(--spacing-lg) 0;
  }
  
  section {
    margin-bottom: var(--spacing-lg);
  }
  
  .analysis-alert {
    padding: 12px;
    font-size: 13px;
  }
  
  .record-item {
    padding: 10px 12px;
  }
}

/* UTILITIES */
.copy-success {
  animation: copySuccess 0.3s ease-in-out;
}

@keyframes copySuccess {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}