:root {
  --site-blue-500: #1f4ceb;
  --site-blue-600: #153bc3;
  --site-blue-700: #102f9d;
  --surface-white: #ffffff;
  --surface-gray: #f3f4f6;
  --text-primary: #1f2937;
  --text-secondary: #4b5563;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  background: var(--surface-gray);
  color: var(--text-primary);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover,
a:focus-visible {
  text-decoration: underline;
}

.site-header {
  background: linear-gradient(90deg, var(--site-blue-500), var(--site-blue-600));
  color: #ffffff;
  width: 100%;
  box-shadow: 0 8px 24px -18px rgba(17, 24, 39, 0.6);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
}

.site-header__brand {
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.02em;
}

.site-header__nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-weight: 500;
}

.site-header__link {
  color: rgba(255, 255, 255, 0.86);
  transition: color 0.2s ease;
}

.site-header__link:hover,
.site-header__link:focus-visible {
  color: #ffffff;
}

.page-shell {
  display: flex;
  gap: 2.5rem;
  justify-content: center;
  align-items: flex-start;
  flex-wrap: wrap;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 3rem 2rem 4rem;
}

.page-shell > * {
  flex: 1 1 320px;
}

.availability-indicator {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid #ffffff;
  box-shadow: 0 0 0 2px rgba(148, 163, 184, 0.35);
}

.availability-indicator.is-green {
  background-color: #16a34a;
}

.availability-indicator.is-yellow {
  background-color: #f59e0b;
}

.availability-indicator.is-red {
  background-color: #dc2626;
}

.availability-indicator.is-grey,
.availability-indicator:not(.is-green):not(.is-yellow):not(.is-red) {
  background-color: #94a3b8;
}

@media (max-width: 720px) {
  .site-header__inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-header__nav {
    flex-wrap: wrap;
    gap: 0.75rem 1.25rem;
  }

  .page-shell {
    padding: 2rem 1.5rem 3rem;
  }
}