:root {
  --color-bg: #f8fafc;
  --color-primary: #15803d;
  --color-secondary: #ca8a04;
  --brand-shchelkovo-teal: #2b7377;
  --brand-shchelkovo-teal-dark: #245f63;
}

html {
  overflow-y: scroll;
  scrollbar-gutter: stable;
}

body {
  background:
    radial-gradient(1000px 500px at 0% -10%, rgba(21, 128, 61, 0.12), transparent 60%),
    radial-gradient(800px 420px at 100% -20%, rgba(202, 138, 4, 0.10), transparent 60%),
    var(--color-bg);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
  background: #888;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #555;
}

.brand-ecosystem-strip {
  background: linear-gradient(180deg, var(--brand-shchelkovo-teal) 0%, var(--brand-shchelkovo-teal-dark) 100%);
  color: #fff;
  border-bottom: 1px solid rgba(0, 0, 0, 0.12);
}

header {
  backdrop-filter: blur(10px);
  background-color: rgba(255, 255, 255, 0.88);
}

.site-shell {
  background: rgba(255, 255, 255, 0.46);
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 1.25rem;
  backdrop-filter: blur(6px);
  box-shadow: 0 18px 45px rgba(15, 23, 42, 0.06);
}

.tool-nav-link {
  display: inline-flex;
  align-items: center;
  height: 100%;
  padding-left: 0.5rem;
  padding-right: 0.5rem;
  color: #4b5563;
  transition: color 0.2s ease;
}

.tool-nav-link:hover {
  color: var(--color-primary);
}

.tool-nav-link.is-active {
  border-bottom: 3px solid var(--color-secondary);
  color: var(--color-primary);
  font-weight: 600;
}

.content-card {
  border-radius: 1rem;
  border: 1px solid #e6edf4;
  background: #fff;
  box-shadow: 0 8px 26px rgba(15, 23, 42, 0.06);
}