.btn {
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
}

.btn:hover {
  border-color: var(--accent);
}

.panel {
  max-width: 720px;
  margin: 0 auto;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #000;
}

.btn-secondary {
  background: transparent;
}

.panel p {
  margin-bottom: 10px;
}

.panel strong {
  display: block;
  margin-top: 12px;
  margin-bottom: 4px;
  font-weight: 600;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;

  background: rgba(2, 6, 23, 0.85);
  backdrop-filter: blur(10px);

  border-bottom: 1px solid var(--line);
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;

  min-height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  color: #fff;
}

.nav {
  display: flex;
  gap: 16px;
  align-items: center;
}

.nav a {
  color: #fff;
  opacity: 0.85;
  text-decoration: none;
}

.nav a:visited {
  color: #fff;
}

.nav a:hover {
  opacity: 1;
}

.nav a.active {
  opacity: 1;
  border-bottom: 1px solid var(--accent);
}

.header-row, .brand, .nav { text-decoration: none; }