.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--sp-3) clamp(1rem, 3vw, 2rem);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: var(--panel);
  z-index: 50;
}

.site-header a { color: var(--ink); text-decoration: none; }
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}
.site-nav-link {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.15s ease;
}
.site-nav-link:hover {
  color: var(--accent);
}
.brand {
  display: inline-flex;
  align-items: center;
}
.brand-logo {
  display: block;
  width: clamp(96px, 12vw, 150px);
  height: auto;
}

.site-ad-slot {
  width: min(1320px, calc(100% - var(--sp-8)));
  margin: var(--sp-3) auto 0;
}
.site-ad-slot-bottom {
  margin: var(--sp-4) auto var(--sp-2);
}
.site-ad-leaderboard {
  width: 100%;
  max-width: 970px;
  min-height: 90px;
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--muted);
  display: grid;
  place-items: center;
  text-align: center;
  padding: var(--sp-2);
  font-size: 0.78rem;
}
.site-ad-leaderboard.is-placeholder {
  background:
    repeating-linear-gradient(
      -45deg,
      #1a283a 0px,
      #1a283a 10px,
      #122033 10px,
      #122033 20px
    );
}

main { padding: clamp(1rem, 3vw, 2rem); max-width: 1320px; margin: 0 auto; }

.site-footer {
  width: min(1320px, calc(100% - var(--sp-8)));
  margin: 0 auto var(--sp-6);
  padding: var(--sp-3) 0 var(--sp-6);
  border-top: 1px solid var(--line);
  text-align: center;
}
.site-footer p { margin: 0.2rem 0; }
.site-footer-copy {
  font-size: 0.82rem;
  color: #dbe7f8;
  font-weight: 600;
}
.site-footer-meta a {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.8rem;
}
.site-footer-meta a:hover { text-decoration: underline; }
.site-footer-disclaimer {
  color: var(--muted);
  font-size: 0.74rem;
}

@media (max-width: 640px) {
  .site-ad-slot { width: calc(100% - var(--sp-4)); }
  .site-ad-leaderboard {
    min-height: 50px;
    border-radius: var(--radius);
  }
}