/**
 * CSS Variables & Reset
 */
:root {
  /* Colors */
  --bg-primary: #0a0e27;
  --bg-secondary: #151937;
  --bg-card: #1e2449;
  --bg-card-hover: #252b54;
  
  --text-primary: #ffffff;
  --text-secondary: #a0aec0;
  --text-muted: #718096;
  
  --accent-primary: #667eea;
  --accent-secondary: #764ba2;
  --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  
  --success: #48bb78;
  --warning: #ed8936;
  --error: #f56565;
  
  --border-color: #2d3748;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.4);
  
  /* Typography */
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  
  /* Border radius */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/**
 * Container & Layout
 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-md);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

.header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-xs);
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
  font-weight: 400;
}

/**
 * Main Content
 */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

/**
 * Clock Section
 */
.clock-section {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.clock-container {
  text-align: center;
}

.clock {
  font-family: var(--font-mono);
  font-size: 4rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: var(--spacing-lg);
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: inline-flex;
  align-items: baseline;
  gap: 0.1em;
  border: 1px solid var(--border-color);
  font-variant-numeric: tabular-nums;
  user-select: none;
  position: relative;
  overflow: hidden;
}

.clock::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-gradient);
  opacity: 0.5;
}

.time-part {
  display: inline-block;
  min-width: 1.2ch;
  text-align: center;
}

.separator {
  opacity: 0.6;
  font-weight: 400;
}

.milliseconds {
  font-size: 0.6em;
  opacity: 0.8;
  color: var(--accent-primary);
  font-weight: 600;
}

.clock-label {
  margin-top: var(--spacing-sm);
  font-size: 0.875rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 500;
}

/* Mobile clock adjustments */
@media (max-width: 768px) {
  .clock {
    font-size: 2.5rem;
    padding: var(--spacing-md);
  }
  
  .header h1 {
    font-size: 2rem;
  }
}

/**
 * Cards Grid
 */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.card-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-md);
}

/**
 * Offset Card
 */
.offset-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.offset-value {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

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

.offset-value.negative {
  color: var(--accent-primary);
}

.offset-value.high {
  color: var(--warning);
}

.offset-value.critical {
  color: var(--error);
}

.offset-error {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.status-message {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: var(--spacing-sm);
  min-height: 1.5em;
}

.resync-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--accent-gradient);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.resync-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(102, 126, 234, 0.4);
}

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

.resync-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.resync-btn svg {
  animation: none;
}

.resync-btn.syncing svg {
  animation: rotate 1s linear infinite;
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/**
 * Local Time Card
 */
.local-time-display {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.local-time {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.local-location {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.local-note {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-style: italic;
  margin-top: var(--spacing-xs);
}

/**
 * Diagnostics Panel
 */
.diagnostics-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.diagnostics-details {
  width: 100%;
}

.diagnostics-summary {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  cursor: pointer;
  user-select: none;
  list-style: none;
  font-weight: 600;
  color: var(--text-primary);
  transition: background-color 0.2s ease;
}

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

.diagnostics-summary:hover {
  background: var(--bg-card-hover);
}

.diagnostics-summary svg {
  color: var(--accent-primary);
  flex-shrink: 0;
}

.diagnostics-summary > span:first-of-type {
  flex: 1;
}

.badge {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  font-size: 0.75rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.badge.healthy {
  background: rgba(72, 187, 120, 0.2);
  color: var(--success);
}

.diagnostics-content {
  padding: 0 var(--spacing-md) var(--spacing-md);
  animation: slideDown 0.3s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.diagnostics-header h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.consensus-info {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.consensus-info span {
  color: var(--accent-primary);
  font-weight: 600;
}

.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.diagnostics-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.diagnostics-table thead {
  background: var(--bg-secondary);
}

.diagnostics-table th {
  padding: var(--spacing-sm);
  text-align: left;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

.diagnostics-table td {
  padding: var(--spacing-sm);
  border-top: 1px solid var(--border-color);
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.diagnostics-table tbody tr:hover {
  background: var(--bg-card-hover);
}

.loading-cell {
  text-align: center;
  color: var(--text-muted);
  padding: var(--spacing-lg) !important;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 600;
}

.status-badge.healthy {
  background: rgba(72, 187, 120, 0.2);
  color: var(--success);
}

.status-badge.unhealthy {
  background: rgba(245, 101, 101, 0.2);
  color: var(--error);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/**
 * Warning Message
 */
.warning-message {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: rgba(237, 137, 54, 0.1);
  border: 1px solid var(--warning);
  border-radius: var(--radius-sm);
  color: var(--warning);
  font-size: 0.875rem;
  animation: slideIn 0.3s ease;
}

.warning-message.hidden {
  display: none;
}

.warning-message svg {
  flex-shrink: 0;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/**
 * Footer
 */
.footer {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer p {
  margin-bottom: var(--spacing-xs);
}

.footer-note {
  font-size: 0.75rem;
  opacity: 0.7;
}

/**
 * Utility Classes
 */
.hidden {
  display: none !important;
}

/**
 * Focus Styles (Accessibility)
 */
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/**
 * Responsive Design
 */
@media (max-width: 640px) {
  .cards-grid {
    grid-template-columns: 1fr;
  }
  
  .diagnostics-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .table-wrapper {
    font-size: 0.75rem;
  }
  
  .diagnostics-table th,
  .diagnostics-table td {
    padding: var(--spacing-xs);
  }
}

/**
 * Print Styles
 */
@media print {
  body {
    background: white;
    color: black;
  }
  
  .resync-btn,
  .diagnostics-details {
    display: none;
  }
}