/* ==========================================================================
   WhoisDNS Web Tools - Design System & Complete Responsive Stylesheet
   Adheres to DESIGN.md, UI/UX Pro Max, and Antislop Mobile Layout Guidelines
   ========================================================================== */

:root {
  /* Primitive Color Tokens */
  --color-bg-base: #0c1017;
  --color-bg-surface: #141b27;
  --color-bg-card: #182234;
  --color-bg-hover: #1e2c44;
  --color-border: #24344d;
  --color-border-glow: rgba(0, 229, 255, 0.35);

  /* Semantic Color Tokens */
  --accent-cyan: #00E5FF;
  --accent-cyan-hover: #33ebff;
  --accent-cyan-dim: rgba(0, 229, 255, 0.12);
  --accent-green: #32D74B;
  --accent-green-dim: rgba(50, 215, 75, 0.12);
  --accent-red: #FF453A;
  --accent-red-dim: rgba(255, 69, 58, 0.12);
  --accent-amber: #F59E0B;
  --accent-amber-dim: rgba(245, 158, 11, 0.12);

  /* Typography Colors */
  --text-main: #FFFFFF;
  --text-muted: #94A3B8;
  --text-subtle: #64748B;

  /* Typography Fonts */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', "Fira Code", monospace;

  /* Elevation & Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(0, 229, 255, 0.15);

  /* Layout Rhythm */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

/* Base Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  max-width: 100vw;
  overflow-x: hidden; /* Prevent horizontal jitter & scroll leak */
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg-base);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  min-height: 100dvh; /* Dynamic viewport units */
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.font-mono {
  font-family: var(--font-mono);
}

.accent-cyan { color: var(--accent-cyan); }
.accent-green { color: var(--accent-green); }
.accent-red { color: var(--accent-red); }
.accent-amber { color: var(--accent-amber); }

/* Focus styles for Keyboard & Accessibility */
:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
}

/* ==========================================================================
   Header Navigation
   ========================================================================== */

.app-header {
  border-bottom: 1px solid var(--color-border);
  background-color: rgba(12, 16, 23, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
}

.header-container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.2), rgba(50, 215, 75, 0.1));
  border: 1px solid var(--accent-cyan-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
  white-space: nowrap;
}

.brand-badge {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--accent-cyan);
}

.header-status {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-green);
  box-shadow: 0 0 8px var(--accent-green);
  animation: pulse 2s infinite ease-in-out;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--accent-cyan);
}

/* ==========================================================================
   Main Layout & Container
   ========================================================================== */

.main-layout {
  max-width: 1320px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
  flex: 1;
  width: 100%;
}

/* ==========================================================================
   Search Hero Section
   ========================================================================== */

.search-section {
  text-align: center;
  margin-bottom: 2rem;
}

.search-hero-content {
  max-width: 760px;
  margin: 0 auto 1.5rem;
}

.hero-title {
  font-size: clamp(1.65rem, 4.5vw, 2.35rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 0.65rem;
  text-wrap: balance;
}

.gradient-text {
  background: linear-gradient(135deg, var(--text-main) 30%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  color: var(--text-muted);
  font-size: clamp(0.875rem, 2vw, 0.975rem);
  line-height: 1.5;
  text-wrap: pretty;
}

.search-box-wrapper {
  max-width: 780px;
  margin: 0 auto;
}

.search-form {
  position: relative;
  margin-bottom: 0.85rem;
}

.input-group {
  display: flex;
  align-items: center;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 0.35rem 0.5rem 0.35rem 1.15rem;
  box-shadow: var(--shadow-md);
  min-height: 52px;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.input-group:focus-within {
  border-color: var(--accent-cyan);
  box-shadow: var(--shadow-glow);
}

.input-icon {
  color: var(--text-subtle);
  display: flex;
  align-items: center;
  margin-right: 0.65rem;
  flex-shrink: 0;
}

.search-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-main);
  font-family: var(--font-mono);
  /* 16px base font on mobile prevents unwanted iOS Safari viewport zoom */
  font-size: 16px;
  outline: none;
  min-width: 0;
}

.search-input::placeholder {
  color: var(--text-subtle);
  font-family: var(--font-sans);
  font-size: 0.925rem;
}

.btn-clear {
  background: transparent;
  border: none;
  color: var(--text-subtle);
  width: 44px;
  height: 44px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.btn-clear:hover {
  color: var(--text-main);
}

.btn-primary {
  background-color: var(--accent-cyan);
  color: #0c1017;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.95rem;
  border: none;
  border-radius: var(--radius-md);
  padding: 0 1.35rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-height: 44px;
  flex-shrink: 0;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.btn-primary:hover {
  background-color: var(--accent-cyan-hover);
  transform: translateY(-1px);
}

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

.search-footer-chips {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  font-size: 0.825rem;
}

.chips-group, .history-chips-group {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.chips-label {
  color: var(--text-subtle);
  font-weight: 500;
  margin-right: 0.25rem;
}

.chip-item {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 6px 12px;
  border-radius: var(--radius-full);
  cursor: pointer;
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  transition: all var(--transition-fast);
}

.chip-item:hover, .chip-item:active {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  background-color: var(--accent-cyan-dim);
}

.history-items-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  justify-content: center;
}

/* ==========================================================================
   States (Loading & Error)
   ========================================================================== */

.state-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 3rem 1.5rem;
  text-align: center;
  max-width: 650px;
  margin: 1.5rem auto;
}

.radar-scanner {
  position: relative;
  width: 72px;
  height: 72px;
  margin: 0 auto 1.25rem;
  border: 2px solid var(--color-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.radar-circle {
  width: 36px;
  height: 36px;
  border: 1px dashed var(--accent-cyan-dim);
  border-radius: 50%;
}

.radar-beam {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: conic-gradient(from 0deg, rgba(0, 229, 255, 0.4) 0deg, transparent 60deg);
  animation: radarSpin 1.4s linear infinite;
}

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

.loading-heading {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.loading-sub {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.error-state .error-icon {
  margin-bottom: 1rem;
}

.error-heading {
  font-size: 1.25rem;
  color: var(--accent-red);
  margin-bottom: 0.5rem;
}

.error-message {
  color: var(--text-muted);
  font-size: 0.925rem;
  margin-bottom: 1.25rem;
  word-break: break-word;
}

.btn-secondary {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  color: var(--text-main);
  padding: 0 1.35rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(0,0,0,0.2);
  border-top-color: #000;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ==========================================================================
   Domain Overview Banner Card (DESIGN.md Style)
   ========================================================================== */

.domain-overview-card {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-md);
}

.overview-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.overview-title-block {
  min-width: 0;
  flex: 1;
}

.domain-name-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}

.target-domain {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 4vw, 1.85rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  word-break: break-all;
}

.badge {
  font-size: 0.725rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 9px;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.badge-tld {
  background-color: var(--accent-cyan-dim);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 229, 255, 0.3);
}

.badge-status {
  background-color: var(--accent-green-dim);
  color: var(--accent-green);
  border: 1px solid rgba(50, 215, 75, 0.3);
}

.badge-dnssec {
  background-color: var(--color-bg-card);
  color: var(--text-muted);
  border: 1px solid var(--color-border);
}

.domain-sub-meta {
  color: var(--text-muted);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  word-break: break-word;
}

.bullet {
  color: var(--text-subtle);
}

.overview-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.btn-action {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  padding: 0 0.85rem;
  font-size: 0.825rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  min-height: 40px;
  transition: all var(--transition-fast);
}

.btn-action:hover, .btn-action:active {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  background-color: var(--accent-cyan-dim);
}

/* 4 KPI Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.85rem;
}

.metric-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.metric-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-subtle);
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.metric-value {
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 0.35rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.metric-footnote {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ==========================================================================
   Tab Navigation Bar
   ========================================================================== */

.results-tab-bar {
  display: flex;
  gap: 0.35rem;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 1.25rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  scroll-snap-type: x proximity;
  padding-bottom: 2px;
}

.results-tab-bar::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.75rem 1rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  white-space: nowrap;
  min-height: 44px;
  scroll-snap-align: start;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  color: var(--text-main);
}

.tab-btn.active {
  color: var(--accent-cyan);
  border-bottom-color: var(--accent-cyan);
}

.tab-badge {
  font-size: 0.7rem;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--text-muted);
}

.tab-btn.active .tab-badge {
  background-color: var(--accent-cyan-dim);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
}

/* ==========================================================================
   Cards General Styling
   ========================================================================== */

.card {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  width: 100%;
}

.card-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.card-header-title {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  min-width: 0;
}

.card-header-title h3 {
  font-size: 1rem;
  font-weight: 700;
}

.card-body {
  padding: 1.25rem;
}

.btn-ghost {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--text-muted);
  font-size: 0.775rem;
  padding: 6px 12px;
  min-height: 36px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.btn-ghost:hover {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
}

/* ==========================================================================
   Tab 1: Overview Grid
   ========================================================================== */

.overview-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

/* Health Checklist */
.health-score-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  background-color: var(--accent-green-dim);
  color: var(--accent-green);
  border: 1px solid rgba(50, 215, 75, 0.3);
  white-space: nowrap;
}

.health-checklist {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.health-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-md);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
}

.health-badge-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
}

.health-item.pass .health-badge-icon {
  background-color: var(--accent-green-dim);
  color: var(--accent-green);
}

.health-item.warning .health-badge-icon {
  background-color: var(--accent-amber-dim);
  color: var(--accent-amber);
}

.health-item.fail .health-badge-icon {
  background-color: var(--accent-red-dim);
  color: var(--accent-red);
}

.health-item.info .health-badge-icon {
  background-color: var(--color-bg-hover);
  color: var(--text-muted);
}

.health-item-content {
  flex: 1;
  min-width: 0;
}

.health-item-title {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.health-item-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* Nameservers List */
.ns-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.ns-item {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  word-break: break-all;
}

.ns-copy-btn {
  background: transparent;
  border: none;
  color: var(--text-subtle);
  cursor: pointer;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.ns-copy-btn:hover, .ns-copy-btn:active {
  color: var(--accent-cyan);
}

/* Mail & MX List */
.mx-quick-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.mx-item {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  word-break: break-all;
}

.mx-priority {
  font-size: 0.725rem;
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  color: var(--accent-cyan);
  white-space: nowrap;
  flex-shrink: 0;
}

/* Email Authentication Summary (SPF / DMARC / DKIM) */
.email-auth-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.85rem;
}

.email-auth-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-card);
  font-size: 0.725rem;
  font-family: var(--font-mono);
}

.email-auth-chip.present {
  border-color: rgba(50, 215, 75, 0.45);
  color: var(--accent-green, #32D74B);
}

.email-auth-chip.missing {
  border-color: rgba(245, 158, 11, 0.45);
  color: var(--accent-amber, #FBBF24);
}

.badge-subdomain {
  background-color: rgba(99, 102, 241, 0.15);
  color: #A5B4FC;
  border: 1px solid rgba(99, 102, 241, 0.35);
}

/* Geo Details Table */
.geo-details-table {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.65rem;
}

.geo-item {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  padding: 0.75rem;
  border-radius: var(--radius-md);
  min-width: 0;
}

.geo-label {
  font-size: 0.725rem;
  color: var(--text-subtle);
  text-transform: uppercase;
  margin-bottom: 2px;
}

.geo-val {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ==========================================================================
   Tab 2: Deep DNS Records Table
   ========================================================================== */

.dns-card {
  padding: 0;
}

.dns-filter-toolbar {
  padding: 0.85rem 1.15rem;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.dns-pill-filters {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.pill-filter {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.775rem;
  font-weight: 600;
  padding: 6px 11px;
  border-radius: var(--radius-md);
  cursor: pointer;
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  transition: all var(--transition-fast);
}

.pill-filter:hover {
  color: var(--text-main);
  border-color: var(--text-subtle);
}

.pill-filter.active {
  background-color: var(--accent-cyan);
  color: #0c1017;
  border-color: var(--accent-cyan);
}

.dns-search-filter {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: auto;
}

.sub-filter-input {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--text-main);
  font-size: 14px;
  padding: 6px 10px;
  border-radius: var(--radius-md);
  outline: none;
  width: 170px;
  min-height: 36px;
}

.sub-filter-input:focus {
  border-color: var(--accent-cyan);
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.875rem;
}

.data-table th {
  background-color: var(--color-bg-card);
  color: var(--text-subtle);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.data-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}

.data-table tbody tr:hover {
  background-color: var(--color-bg-hover);
}

.record-badge {
  font-size: 0.725rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  display: inline-block;
  text-align: center;
  white-space: nowrap;
}

.record-badge.type-A { background-color: rgba(0, 229, 255, 0.15); color: #00E5FF; }
.record-badge.type-AAAA { background-color: rgba(168, 85, 247, 0.15); color: #C084FC; }
.record-badge.type-CNAME { background-color: rgba(245, 158, 11, 0.15); color: #FBBF24; }
.record-badge.type-MX { background-color: rgba(50, 215, 75, 0.15); color: #32D74B; }
.record-badge.type-TXT { background-color: rgba(148, 163, 184, 0.15); color: #CBD5E1; }
.record-badge.type-NS { background-color: rgba(59, 130, 246, 0.15); color: #60A5FA; }
.record-badge.type-SOA { background-color: rgba(236, 72, 153, 0.15); color: #F472B6; }
.record-badge.type-CAA { background-color: rgba(20, 184, 166, 0.15); color: #2DD4BF; }
.record-badge.type-SRV { background-color: rgba(249, 115, 22, 0.15); color: #FB923C; }
.record-badge.type-HTTPS,
.record-badge.type-SVCB { background-color: rgba(99, 102, 241, 0.15); color: #A5B4FC; }
.record-badge.type-DS,
.record-badge.type-DNSKEY { background-color: rgba(234, 179, 8, 0.15); color: #FDE047; }
.record-badge.type-TLSA { background-color: rgba(217, 70, 239, 0.15); color: #E879F9; }
.record-badge.type-NAPTR { background-color: rgba(100, 116, 139, 0.15); color: #94A3B8; }

.record-ttl {
  color: var(--text-subtle);
  font-size: 0.8rem;
  white-space: nowrap;
}

.record-ttl-mobile {
  display: none;
}

.record-value-cell {
  word-break: break-all;
  max-width: 600px;
}

.btn-table-action {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--text-muted);
  font-size: 0.75rem;
  padding: 5px 10px;
  min-height: 34px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-table-action:hover, .btn-table-action:active {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
}

.btn-ip-detail {
  margin-left: 0.45rem;
  font-size: 0.725rem;
  background-color: var(--accent-cyan-dim);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 229, 255, 0.3);
  padding: 3px 7px;
  min-height: 28px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  white-space: nowrap;
}

/* ==========================================================================
   Tab 3: WHOIS Details
   ========================================================================== */

.whois-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.kv-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.kv-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid rgba(36, 52, 77, 0.4);
}

.kv-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.kv-key {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-subtle);
  font-weight: 600;
}

.kv-val {
  font-size: 0.875rem;
  color: var(--text-main);
  word-break: break-word;
}

.status-tags-container {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.status-tag-item {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.85rem;
}

.status-code-name {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 2px;
  word-break: break-all;
}

.status-code-desc {
  font-size: 0.775rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* ==========================================================================
   Tab 4: Global Propagation
   ========================================================================== */

.propagation-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
  padding: 1.15rem 1.25rem 0;
}

.section-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.prop-controls {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.prop-select {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--text-main);
  padding: 0 0.85rem;
  min-height: 44px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  outline: none;
  cursor: pointer;
}

.prop-select:focus {
  border-color: var(--accent-cyan);
}

.prop-progress-wrapper {
  padding: 0 1.25rem 1.15rem;
  border-bottom: 1px solid var(--color-border);
}

.progress-bar-bg {
  width: 100%;
  height: 8px;
  background-color: var(--color-bg-card);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-green));
  transition: width 0.5s ease;
}

.progress-text-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.825rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 0.4rem;
}

.resolvers-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.85rem;
  padding: 1.25rem;
}

.resolver-node-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.95rem;
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition-fast);
  min-width: 0;
}

.resolver-node-card:hover {
  border-color: var(--accent-cyan-dim);
}

.resolver-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.35rem;
  gap: 0.35rem;
}

.resolver-name {
  font-size: 0.85rem;
  font-weight: 700;
  word-break: break-word;
}

.resolver-status-badge {
  font-size: 0.7rem;
  padding: 2px 6px;
  border-radius: var(--radius-full);
  font-weight: 700;
  white-space: nowrap;
  flex-shrink: 0;
}

.resolver-status-badge.ok {
  background-color: var(--accent-green-dim);
  color: var(--accent-green);
}

.resolver-status-badge.no-record {
  background-color: var(--accent-amber-dim);
  color: var(--accent-amber);
}

.resolver-status-badge.error {
  background-color: var(--accent-red-dim);
  color: var(--accent-red);
}

.resolver-location {
  font-size: 0.75rem;
  color: var(--text-subtle);
  margin-bottom: 0.65rem;
}

.resolver-result-val {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 6px 8px;
  word-break: break-all;
  flex: 1;
  margin-bottom: 0.5rem;
}

.resolver-latency {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
}

/* ==========================================================================
   Tab 5: Raw WHOIS
   ========================================================================== */

.raw-card-toolbar {
  padding: 0.85rem 1.25rem;
  background-color: var(--color-bg-card);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.terminal-dots {
  display: inline-flex;
  gap: 6px;
  margin-right: 0.75rem;
}

.terminal-dots .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.terminal-dots .red { background-color: #FF5F56; }
.terminal-dots .yellow { background-color: #FFBD2E; }
.terminal-dots .green { background-color: #27C93F; }

.raw-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.toggle-wrap {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  cursor: pointer;
  min-height: 36px;
}

.raw-pre {
  background-color: #080c12;
  color: #d1d5db;
  font-family: var(--font-mono);
  font-size: 0.825rem;
  padding: 1.25rem;
  max-height: 600px;
  overflow: auto;
  line-height: 1.55;
  white-space: pre-wrap;
  word-break: break-word;
  -webkit-overflow-scrolling: touch;
}

.raw-pre.nowrap {
  white-space: pre;
}

/* ==========================================================================
   Modal Overlay & Content
   ========================================================================== */

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}

.modal-box {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  max-width: 580px;
  width: 100%;
  max-height: 90vh;
  max-height: 90dvh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 40px rgba(0,0,0,0.8);
  overflow: hidden;
}

.modal-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
}

.modal-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
}

.modal-title h3 {
  font-size: 1.05rem;
  font-weight: 700;
  word-break: break-all;
}

.btn-close-modal {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.75rem;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  line-height: 1;
  flex-shrink: 0;
}

.btn-close-modal:hover {
  color: var(--text-main);
}

.modal-body {
  padding: 1.25rem;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

/* ==========================================================================
   About Section & Footer
   ========================================================================== */

.about-section {
  margin-top: 2.5rem;
  padding: 1.5rem;
}

.about-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.65rem;
}

.about-p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 1.5rem;
}

.features-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.feat-item {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.feat-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-cyan);
  margin-top: 6px;
  flex-shrink: 0;
}

.feat-item strong {
  color: var(--text-main);
}

.app-footer {
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg-base);
  padding: 2rem 1.25rem 1.25rem;
  color: var(--text-subtle);
  font-size: 0.775rem;
  line-height: 1.5;
}

.footer-container {
  max-width: 1100px;
  margin: 0 auto;
  text-align: center;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
  text-align: left;
  margin-bottom: 1.75rem;
}

.footer-col h4 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.6rem;
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.footer-col a {
  color: var(--text-subtle);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-col a:hover,
.footer-col a:focus-visible {
  color: var(--accent-cyan);
}

.footer-copy {
  border-top: 1px solid var(--color-border);
  padding-top: 1.1rem;
  margin: 0;
}

/* Form validation & anti-spam */
.form-error {
  margin: 0.6rem 0 0;
  font-size: 0.8rem;
  color: var(--accent-red, #FF453A);
}

.search-input[aria-invalid="true"] {
  border-color: var(--accent-red, #FF453A);
}

/* Honeypot: removed from layout and from the accessibility tree */
.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
}

/* Breadcrumbs */
.breadcrumbs {
  margin-bottom: 1rem;
  font-size: 0.775rem;
}

.breadcrumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  color: var(--text-muted);
}

.breadcrumbs li + li::before {
  content: "/";
  margin-right: 0.4rem;
  color: var(--color-border);
}

.breadcrumbs a {
  color: var(--text-muted);
  text-decoration: none;
}

.breadcrumbs a:hover,
.breadcrumbs a:focus-visible {
  color: var(--accent-cyan);
  text-decoration: underline;
}

.breadcrumbs li[aria-current="page"] {
  color: var(--text-primary);
}

@media (max-width: 720px) {
  .footer-nav {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: calc(100vw - 40px);
}

.toast {
  background-color: var(--color-bg-card);
  border: 1px solid var(--accent-cyan);
  box-shadow: var(--shadow-md);
  color: var(--text-main);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 8px;
  animation: slideUp 0.25s ease-out;
  word-break: break-word;
}

@keyframes slideUp {
  from { transform: translateY(16px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* ==========================================================================
   Responsive Reflow System (Tablet, Mobile, Compact Phone)
   ========================================================================== */

/* Tablet & Intermediate Screens */
@media (max-width: 1024px) {
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .resolvers-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

/* Small Tablets & Large Phones */
@media (max-width: 768px) {
  .main-layout {
    padding: 1.5rem 1rem 3rem;
  }

  .overview-grid, .whois-grid {
    grid-template-columns: 1fr;
  }

  .header-status .status-text {
    display: none; /* Keep pulse dot on tablet/mobile */
  }

  .dns-filter-toolbar {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }

  .dns-search-filter {
    width: 100%;
  }

  .sub-filter-input {
    flex: 1;
    width: 100%;
  }

  .propagation-header {
    flex-direction: column;
    align-items: stretch;
    gap: 0.85rem;
  }

  .prop-controls {
    width: 100%;
  }

  .prop-select {
    flex: 1;
  }

  .btn-secondary {
    width: 100%;
  }
}

/* Mobile Screens (< 640px): Card-mode transformation & touch ergonomics */
@media (max-width: 640px) {
  .header-container {
    padding: 0.65rem 1rem;
  }

  .brand-name {
    font-size: 1.05rem;
  }

  .search-section {
    margin-bottom: 1.5rem;
  }

  .input-group {
    padding: 0.25rem 0.35rem 0.25rem 0.85rem;
    min-height: 48px;
  }

  .search-input {
    font-size: 16px; /* Vital for iOS Safari to prevent auto-zooming */
  }

  .btn-primary {
    padding: 0 1rem;
    font-size: 0.875rem;
  }

  /* Overview Card Mobile Optimization */
  .domain-overview-card {
    padding: 1rem;
  }

  .overview-header {
    flex-direction: column;
    align-items: stretch;
    gap: 0.85rem;
    margin-bottom: 1rem;
    padding-bottom: 0.85rem;
  }

  .domain-name-row {
    gap: 0.4rem;
  }

  .overview-actions {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    width: 100%;
    gap: 0.45rem;
  }

  .btn-action {
    width: 100%;
    padding: 0 0.5rem;
    font-size: 0.775rem;
    min-height: 42px;
  }

  /* 2x2 Compact Metric Cards on Mobile */
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.55rem;
  }

  .metric-card {
    padding: 0.75rem;
  }

  .metric-label {
    font-size: 0.7rem;
    margin-bottom: 2px;
  }

  .metric-value {
    font-size: 1.15rem;
  }

  .metric-footnote {
    font-size: 0.7rem;
  }

  /* DNS Table: Transform into Mobile Card Feed */
  .data-table thead {
    display: none; /* Hide header on mobile, card rows self-label */
  }

  .data-table, 
  .data-table tbody, 
  .data-table tr, 
  .data-table td {
    display: block;
    width: 100%;
  }

  .data-table tbody tr {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.85rem;
    margin-bottom: 0.65rem;
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
  }

  .data-table tbody tr:last-child {
    margin-bottom: 0;
  }

  .data-table td {
    padding: 0;
    border: none;
  }

  /* First cell: Badge and TTL side-by-side */
  .data-table td:nth-child(1) {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .record-ttl-mobile {
    display: inline-block;
    font-size: 0.75rem;
    color: var(--text-subtle);
    font-family: var(--font-mono);
  }

  .data-table td:nth-child(2) {
    display: none; /* TTL rendered alongside badge in cell 1 */
  }

  /* Record value */
  .data-table td.record-value-cell {
    font-size: 0.825rem;
    line-height: 1.5;
    word-break: break-all;
    background-color: var(--color-bg-surface);
    border: 1px solid rgba(36, 52, 77, 0.6);
    border-radius: var(--radius-sm);
    padding: 0.5rem 0.65rem;
    margin: 0.2rem 0;
  }

  /* Action cell */
  .data-table td:nth-child(4) {
    display: flex;
    justify-content: flex-end;
  }

  .btn-table-action {
    width: 100%;
    min-height: 38px;
  }

  .geo-details-table {
    grid-template-columns: 1fr;
  }

  .resolvers-grid {
    grid-template-columns: 1fr;
    padding: 1rem;
    gap: 0.65rem;
  }

  .resolver-node-card {
    padding: 0.85rem;
  }

  .modal-box {
    width: 100%;
    max-height: 85dvh;
    border-radius: var(--radius-lg);
  }

  .toast-container {
    bottom: 12px;
    right: 12px;
    left: 12px;
    max-width: calc(100vw - 24px);
  }

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

/* Extra Compact Phones (< 380px) */
@media (max-width: 380px) {
  .btn-primary .btn-arrow {
    display: none;
  }

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

  .overview-actions {
    grid-template-columns: 1fr;
  }
}