@import url('https://fonts.googleapis.com/css2?family=Rubik:wght@400;500;700&display=swap');

:root {
  --shell-bg: #0f172a;
  --shell-text: #f8fafc;
  --shell-accent: #f59e0b;
  --shell-muted: rgba(248, 250, 252, 0.75);
  --shell-shadow: 0 12px 24px rgba(15, 23, 42, 0.25);
}

.site-shell {
  font-family: "Rubik", "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(120deg, #0f172a, #1e293b 45%, #0f766e);
  color: var(--shell-text);
  box-shadow: var(--shell-shadow);
}

.shell-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
}

.shell-brand {
  font-weight: 700;
  text-decoration: none;
  color: var(--shell-text);
  letter-spacing: 0.02em;
  font-size: 1.1rem;
}

.shell-nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.shell-nav a {
  color: var(--shell-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

.shell-nav a:hover,
.shell-nav a:focus {
  color: var(--shell-accent);
}

.site-footer {
  margin-top: 4rem;
}

.site-footer p {
  margin: 0;
  color: var(--shell-muted);
  font-size: 0.95rem;
}

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