/* ============================================
   VICTORIAN DEBT CLOCK — Core Styles
   Bloomberg Terminal Aesthetic / Dark Theme
   ============================================ */

:root {
  /* Colour Palette */
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a2234;
  --bg-card-hover: #1f2a40;
  --border-subtle: #1e293b;
  --border-accent: #334155;

  /* Text */
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  /* Accent Colours */
  --red-debt: #ef4444;
  --red-debt-glow: rgba(239, 68, 68, 0.3);
  --red-dark: #991b1b;
  --green-revenue: #22c55e;
  --green-glow: rgba(34, 197, 94, 0.2);
  --amber-warning: #f59e0b;
  --blue-accent: #3b82f6;
  --blue-glow: rgba(59, 130, 246, 0.2);
  --cyan-info: #06b6d4;

  /* Typography */
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', 'Cascadia Code', ui-monospace, monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;

  /* Spacing */
  --section-padding: clamp(3rem, 8vw, 6rem);
  --container-max: 1200px;

  /* Animation */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--blue-accent);
  color: #fff;
  padding: 0.75rem 1.5rem;
  border-radius: 0 0 0.5rem 0.5rem;
  z-index: 10000;
  font-weight: 600;
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

/* Container */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2rem);
}

/* Section Base */
.section {
  padding: var(--section-padding) 0;
  position: relative;
}

.section--bordered {
  border-top: 1px solid var(--border-subtle);
}

/* Section Headers */
.section__label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.section__label::before {
  content: '';
  display: block;
  width: 12px;
  height: 1px;
  background: var(--text-muted);
}

.section__title {
  font-family: var(--font-sans);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.section__subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.7;
}

/* Utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Animated Sections */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Tooltip */
.source-tooltip {
  position: relative;
  display: inline-flex;
  align-items: center;
  cursor: help;
}

.source-tooltip__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--border-accent);
  color: var(--text-muted);
  font-size: 0.625rem;
  font-weight: 700;
  font-family: var(--font-mono);
  margin-left: 0.375rem;
  transition: background var(--transition-fast);
  flex-shrink: 0;
}

.source-tooltip:hover .source-tooltip__icon,
.source-tooltip:focus .source-tooltip__icon {
  background: var(--blue-accent);
  color: #fff;
}

.source-tooltip__content {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-card);
  border: 1px solid var(--border-accent);
  border-radius: 0.5rem;
  padding: 0.75rem 1rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
  z-index: 100;
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
}

.source-tooltip:hover .source-tooltip__content,
.source-tooltip:focus-within .source-tooltip__content {
  opacity: 1;
  visibility: visible;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-accent);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Focus Styles */
:focus-visible {
  outline: 2px solid var(--blue-accent);
  outline-offset: 2px;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .animate-on-scroll {
    opacity: 1;
    transform: none;
  }
}

/* Selection */
::selection {
  background: var(--blue-accent);
  color: #fff;
}