:root {
  /* Apple / HIG Foundation */
  --system-bg: #F5F5F7;
  --card-bg: rgba(255, 255, 255, 0.85);
  --card-solid: #FFFFFF;
  --separator: rgba(60, 60, 67, 0.12);
  --separator-opaque: #E5E5EA;
  --label-primary: #1D1D1F;
  --label-secondary: #6E6E73;
  --label-tertiary: #86868B;
  
  /* Brand Accents */
  --brand-green: #007D3F;
  --brand-green-light: #00A653;
  --brand-green-glow: rgba(0, 125, 63, 0.12);
  --accent-gold: #D97706;
  --accent-blue: #0071E3;
  --accent-teal: #0D9488;

  /* Typography */
  --font-system: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  /* Elevation */
  --shadow-subtle: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-float: 0 12px 32px rgba(0, 0, 0, 0.08);
}

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

body {
  font-family: var(--font-system);
  background-color: var(--system-bg);
  color: var(--label-primary);
  line-height: 1.47059;
  letter-spacing: -0.011em;
  -webkit-font-smoothing: antialiased;
  min-height: 100dvh;
}

/* Glass Header */
header.apple-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 0.5px solid var(--separator);
  padding: 0.75rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
}

.brand-glyph {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--brand-green), #059669);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  font-weight: 700;
  box-shadow: 0 4px 12px var(--brand-green-glow);
}

.brand-text h1 {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--label-primary);
}

.brand-text span {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--label-secondary);
  letter-spacing: -0.01em;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--label-secondary);
  background: rgba(0, 0, 0, 0.04);
  padding: 0.35rem 0.85rem;
  border-radius: 980px;
  white-space: nowrap;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brand-green);
  box-shadow: 0 0 6px var(--brand-green);
  flex-shrink: 0;
}

.btn-contact {
  background: var(--brand-green);
  color: #FFFFFF;
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  padding: 0.45rem 1.1rem;
  border-radius: 980px;
  white-space: nowrap;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-contact:hover {
  background: var(--brand-green-light);
  transform: scale(1.02);
}

/* Hero Section */
.hero-wrapper {
  max-width: 1440px;
  margin: 0 auto;
  padding: 3.5rem 2rem 2rem;
}

.hero-title-group {
  margin-bottom: 2.5rem;
}

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--brand-green);
  margin-bottom: 0.5rem;
}

.hero-headline {
  font-size: 2.75rem;
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.12;
  color: var(--label-primary);
  margin-bottom: 0.85rem;
}

.hero-subhead {
  font-size: 1.15rem;
  color: var(--label-secondary);
  max-width: 820px;
  line-height: 1.5;
  letter-spacing: -0.015em;
}

/* KPI Bento Grid */
.kpi-bento {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.kpi-tile {
  background: var(--card-solid);
  border-radius: 18px;
  padding: 1.4rem 1.5rem;
  border: 1px solid var(--separator-opaque);
  box-shadow: var(--shadow-subtle);
  position: relative;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.kpi-tile:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-float);
}

.kpi-tile::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--brand-green);
}

.kpi-tile.gold::before { background: var(--accent-gold); }
.kpi-tile.blue::before { background: var(--accent-blue); }
.kpi-tile.teal::before { background: var(--accent-teal); }

.kpi-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--label-secondary);
  margin-bottom: 0.4rem;
}

.kpi-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--label-primary);
  font-family: var(--font-mono);
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 0.25rem;
}

.kpi-number span {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--label-secondary);
}

.kpi-caption {
  font-size: 0.8rem;
  color: var(--label-tertiary);
}

/* Interactive Surface Card */
.surface-card {
  background: var(--card-solid);
  border-radius: 20px;
  border: 1px solid var(--separator-opaque);
  box-shadow: var(--shadow-subtle);
  overflow: hidden;
  margin-bottom: 2rem;
}

.surface-header {
  padding: 1.5rem 2rem 1.25rem;
  border-bottom: 1px solid var(--separator-opaque);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 1rem;
}

.surface-title h2 {
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--label-primary);
  margin-bottom: 0.25rem;
}

.surface-title p {
  font-size: 0.9rem;
  color: var(--label-secondary);
}

.surface-tools {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn-pill-action {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--system-bg);
  border: 1px solid var(--separator-opaque);
  color: var(--label-primary);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.45rem 0.95rem;
  border-radius: 980px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-pill-action:hover {
  background: #E5E5EA;
}

/* Filter Bar */
.filter-bar {
  padding: 0.85rem 2rem;
  background: rgba(250, 251, 251, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--separator-opaque);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.25rem;
  position: sticky;
  top: 61px;
  z-index: 100;
}

.filter-cluster {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.scotland-deepdive-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(0, 125, 63, 0.08);
  border: 1px solid rgba(0, 125, 63, 0.25);
  color: var(--brand-green);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.35rem 0.85rem;
  border-radius: 980px;
  text-decoration: none;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.scotland-deepdive-pill:hover {
  background: var(--brand-green);
  color: #FFFFFF;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 125, 63, 0.2);
}

.segmented-control {
  display: inline-flex;
  background: rgba(118, 118, 128, 0.12);
  padding: 2px;
  border-radius: 8px;
}

.segmented-btn {
  border: none;
  background: transparent;
  padding: 5px 14px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--label-primary);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.segmented-btn.active {
  background: #FFFFFF;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  font-weight: 600;
}

.select-wrapper select {
  font-family: var(--font-system);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.4rem 0.85rem;
  border-radius: 8px;
  border: 1px solid var(--separator-opaque);
  background: #FFFFFF;
  color: var(--label-primary);
  outline: none;
  cursor: pointer;
}

.throughput-stat {
  font-size: 0.85rem;
  color: var(--label-secondary);
}

.throughput-stat strong {
  color: var(--label-primary);
}

/* Canvas Area */
.chart-canvas {
  width: 100%;
  height: 750px;
  position: relative;
}

/* Insights Section */
.insights-strip {
  padding: 1.75rem 2rem;
  background: #FFFFFF;
  border-top: 1px solid var(--separator-opaque);
}

.insights-header {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--brand-green);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.insights-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.insight-block {
  font-size: 0.875rem;
  color: var(--label-secondary);
  line-height: 1.55;
}

.insight-block strong {
  color: var(--label-primary);
}

/* WebGIS Discovery Card */
.webgis-banner {
  background: linear-gradient(135deg, #064E3B 0%, #0F172A 100%);
  border-radius: 20px;
  padding: 2.5rem;
  color: #FFFFFF;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 3.5rem;
  box-shadow: 0 10px 30px rgba(6, 78, 59, 0.25);
}

.webgis-info h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.webgis-info p {
  font-size: 0.95rem;
  color: #D1FAE5;
  max-width: 650px;
}

.btn-webgis {
  background: #FFFFFF;
  color: #064E3B;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.75rem 1.4rem;
  border-radius: 980px;
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.btn-webgis:hover {
  background: #F0FDF4;
  transform: scale(1.03);
}

/* Footer */
footer.apple-footer {
  border-top: 1px solid var(--separator-opaque);
  background: #FFFFFF;
  padding: 2.5rem 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--label-tertiary);
}

footer.apple-footer p {
  margin-top: 0.25rem;
}

/* Responsive Breakpoints & Apple HIG Polish */
@media (max-width: 1199px) and (min-width: 768px) {
  .kpi-bento {
    grid-template-columns: repeat(6, 1fr);
    gap: 0.85rem;
  }
  .kpi-tile:nth-child(1),
  .kpi-tile:nth-child(2),
  .kpi-tile:nth-child(3) {
    grid-column: span 2;
  }
  .kpi-tile:nth-child(4),
  .kpi-tile:nth-child(5) {
    grid-column: span 3;
  }
}

@media (max-width: 767px) and (min-width: 480px) {
  .hero-wrapper {
    padding: 2rem 1.25rem 1.5rem;
  }
  .hero-headline {
    font-size: 2rem;
  }
  .kpi-bento {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }
  .kpi-tile:nth-child(5) {
    grid-column: span 2;
  }
  .chart-canvas {
    height: 580px;
  }
  .filter-bar {
    padding: 0.85rem 1.25rem;
    gap: 0.75rem;
  }
}

@media (max-width: 640px) {
  .nav-pill {
    display: none;
  }
  .nav-actions {
    gap: 0.5rem;
  }
}

@media (max-width: 479px) {
  .hero-wrapper {
    padding: 1.5rem 1rem 1rem;
  }
  .hero-headline {
    font-size: 1.65rem;
  }
  .kpi-bento {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
  .chart-canvas {
    height: 500px;
  }
  .filter-cluster {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }
  .segmented-control {
    width: 100%;
  }
  .segmented-btn {
    flex: 1;
    text-align: center;
  }
  .select-wrapper select {
    width: 100%;
  }
}