:root {
  --bg: #0f172a;
  --bg-panel: #1e293b;
  --bg-card: #334155;
  --bg-hover: #475569;
  --border: #475569;
  --text: #f1f5f9;
  --text-dim: #94a3b8;
  --text-muted: #64748b;
  --green: #10b981;
  --yellow: #f59e0b;
  --blue: #3b82f6;
  --red: #ef4444;
  --orange: #f97316;
  --cyan: #06b6d4;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
}

body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  height: 100vh;
  overflow: hidden;
}

.app-header {
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.app-header h1 {
  font-size: 16px;
  font-weight: 600;
}

.app-header .subtitle {
  font-size: 12px;
  color: var(--text-dim);
}

.header-nav {
  margin-left: auto;
  display: flex;
  gap: 6px;
}

.header-nav a {
  color: var(--text-dim);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 4px;
  font-size: 13px;
}

.header-nav a:hover {
  background: var(--bg-card);
  color: var(--text);
}

.header-nav a.active {
  background: var(--bg-card);
  color: var(--text);
}

.header-nav a.future {
  opacity: 0.4;
  pointer-events: none;
}

main#app-root {
  overflow-y: auto;
  padding: 24px 32px;
}

.app-footer {
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  padding: 8px 24px;
  font-size: 11px;
  color: var(--text-muted);
}

code {
  font-family: "SF Mono", Monaco, "Cascadia Code", monospace;
  font-size: 13px;
  background: var(--bg);
  padding: 2px 6px;
  border-radius: 3px;
}

a { color: var(--blue); }
a:hover { color: var(--cyan); }