:root {
  --bg: #0b0d10;
  --fg: #f3f4f6;
  --muted: #9ca3af;
  --accent: #f59e0b;
  --header-h: 56px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-header {
  height: var(--header-h);
  padding: 0 1rem;
  display: flex;
  align-items: center;
  border-bottom: 1px solid #1f2937;
  background: #0f1216;
}

.site-header h1 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

main {
  flex: 1;
  position: relative;
  min-height: 0;
}

#viewer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background: #000;
}

#viewer.viewer-error {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  text-align: center;
  color: var(--fg);
  font-size: 1rem;
  line-height: 1.5;
}

.noscript {
  padding: 2rem;
  text-align: center;
  color: var(--muted);
}

@media (max-width: 600px) {
  .site-header h1 { font-size: 1rem; }
}