:root {
  --parchment: #fdf6e3;
  --ink: #4a3728;
  --gold: #c5a059;
  --gold-glow: #d4af37;
}

body {
  margin: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
  font-family: 'Crimson Pro', serif;
  background-color: #1a1a1a;
  overflow: hidden;
}

.app-header {
  background: var(--parchment);
  color: var(--ink);
  padding: 10px 40px;
  border-bottom: 2px solid var(--gold);
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  z-index: 100;
}

.logo h1 {
  margin: 0;
  font-family: 'Cinzel', serif;
  font-size: 1.5rem;
  letter-spacing: 1px;
  color: #630000;
}

.logo p {
  margin: 0;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  opacity: 0.7;
}

.top-nav {
  display: flex;
  gap: 30px;
}

.nav-link {
  text-decoration: none;
  color: var(--ink);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  transition: all 0.3s ease;
}

.nav-link:hover {
  color: var(--gold-glow);
}

.nav-link.active {
  color: var(--gold-glow);
  border-bottom: 2px solid var(--gold-glow);
}

.viewer-container {
  flex: 1;
}

iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.app-footer {
  background: #0f0f0f;
  color: #888;
  padding: 8px 40px;
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  border-top: 1px solid #333;
}

.app-footer a {
  color: #ccc;
  text-decoration: none;
  transition: color 0.2s;
}

.app-footer a:hover { color: var(--gold-glow); }
.sep { margin: 0 10px; color: #444; }