.layout {
  min-height: 100vh;
  background: var(--surface-0);
}

.header {
  background: var(--surface-1);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
}

.header-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  height: 56px;
}

.logo {
  font-size: 0.95rem;
  font-weight: 680;
  color: var(--text-primary);
  text-decoration: none;
  white-space: nowrap;
}

.nav {
  display: flex;
  gap: 0.15rem;
  flex: 1;
  overflow-x: auto;
  scrollbar-width: none;
}

.nav::-webkit-scrollbar { display: none; }

.nav-link {
  padding: 0.4rem 0.7rem;
  border-radius: 7px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  white-space: nowrap;
  transition: background 0.15s ease, color 0.15s ease;
}

.nav-link:hover {
  background: var(--surface-0);
  color: var(--text-primary);
}

.nav-link.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-radius: 7px;
  padding: 0.3rem 0.6rem;
  font-size: 0.76rem;
  cursor: pointer;
  font-family: inherit;
  white-space: nowrap;
}

.theme-toggle:hover {
  border-color: var(--border-strong);
  color: var(--text-primary);
}

.content {
  max-width: 1180px;
  margin: 0 auto;
  padding: 1.75rem 1.5rem 4rem;
}

@media (max-width: 720px) {
  .header-inner {
    gap: 0.75rem;
    padding: 0 0.9rem;
  }
  .logo { font-size: 0.85rem; }
  .content { padding: 1.25rem 0.9rem 3rem; }
}