:root {
  --primary-green: #00a651;
  --dark-bg: #0f1114;
  --card-bg: #16191f;
  --text-light: #f4f4f4;
  --text-muted: #a1a8b3;
  --accent: #ffd700;
  --border: #2a2f38;
}

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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--dark-bg);
  color: var(--text-light);
  line-height: 1.6;
}

a {
  color: var(--text-light);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--primary-green);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--dark-bg);
  border-bottom: 1px solid var(--border);
}

.header-accent {
  height: 4px;
  background: linear-gradient(to right, var(--primary-green), var(--accent));
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  max-width: 1200px;
  margin: 0 auto;
}

.logo .brand {
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.5px;
}

.main-nav {
  display: none;
}

.cta-button {
  background-color: var(--primary-green);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.875rem;
}

.cta-button:hover {
  background-color: #008f44;
  color: #fff;
}

.mobile-menu-btn {
  background: none;
  border: none;
  color: var(--text-light);
  font-size: 1.5rem;
  cursor: pointer;
}

.mobile-nav {
  display: none;
  flex-direction: column;
  background-color: var(--card-bg);
  padding: 1rem;
  border-top: 1px solid var(--border);
}

.mobile-nav a {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}

.masthead {
  position: relative;
  height: 60vh;
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.masthead-image {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: brightness(0.6);
}

.masthead-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(rgba(15, 17, 20, 0.65), rgba(15, 17, 20, 0.85));
}

.masthead-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding: 2rem 1rem;
  text-align: center;
}

.masthead-content h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
  line-height: 1.1;
}

.subheadline {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.data-strip {
  display: inline-block;
  background-color: rgba(255,255,255,0.1);
  padding: 0.35rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  margin-bottom: 1rem;
}

.editorial-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}

.editorial-tags span {
  background-color: var(--card-bg);
  font-size: 0.7rem;
  padding: 0.25rem 0.6rem;
  border-radius: 3px;
  border: 1px solid var(--border);
}

.snapshot-note {
  background-color: var(--card-bg);
  text-align: center;
  padding: 1rem;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.group-navigator {
  background-color: var(--dark-bg);
  padding: 1rem 0;
  position: sticky;
  top: 60px;
  z-index: 90;
}

.group-nav-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.group-nav-inner a {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 50%;
  font-weight: 600;
  font-size: 0.875rem;
  flex-shrink: 0;
}

.group-nav-inner a:hover, .group-nav-inner a:focus {
  background-color: var(--primary-green);
  color: #fff;
  border-color: var(--primary-green);
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

footer {
  background-color: #0a0c0f;
  padding: 2rem 1rem 1rem;
  margin-top: 2rem;
  border-top: 1px solid var(--border);
}

.footer-top {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.footer-left .logo-footer {
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.footer-middle, .footer-right {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.footer-middle h4, .footer-right h4 {
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
}

.footer-notice {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 1rem;
  grid-column: 1 / -1;
}

.footer-bottom {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.7rem;
  color: var(--text-muted);
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

/* Mobile-first responsive */
@media (min-width: 768px) {
  .desktop-nav {
    display: flex;
    gap: 1.5rem;
  }
  
  .mobile-menu-btn {
    display: none;
  }
  
  .mobile-nav {
    display: none !important;
  }
  
  .masthead-content h1 {
    font-size: 3rem;
  }
  
  .footer-top {
    flex-direction: row;
    flex-wrap: wrap;
  }
  
  .footer-left {
    flex: 1 1 300px;
  }
  
  .footer-middle, .footer-right {
    flex: 1 1 150px;
  }
}

@media (min-width: 1024px) {
  .header-inner {
    padding: 1rem 2rem;
  }
  
  .group-nav-inner {
    gap: 0.75rem;
  }
  
  .group-nav-inner a {
    width: 48px;
    height: 48px;
  }
}