:root {
  --bg-app: #ffffff;
  --bg-surface: #f9f9f9;
  --border-color: #eaeaea;
  --text-primary: #111111;
  --text-secondary: #666666;
  --accent-color: #0070f3;
  --accent-success: #0070f3;
  --radius-card: 8px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.05);
  --transition-smooth: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  --bg-app: #000000;
  --bg-surface: #111111;
  --border-color: #333333;
  --text-primary: #ffffff;
  --text-secondary: #888888;
  --accent-color: #ffffff;
  --shadow-sm: 0 1px 2px rgba(255,255,255,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

body {
  background-color: var(--bg-app);
  color: var(--text-primary);
  transition: var(--transition-smooth);
  display: flex;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Layout Estrutural Flexível */
#app-container {
  display: flex;
  width: 100%;
}

aside.sidebar {
  width: 240px;
  border-right: 1px solid var(--border-color);
  background: var(--bg-surface);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

main.content-area {
  flex: 1;
  padding: 2.5rem;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

/* Componentização de Cards (Inspirado em Stripe/Linear) */
.card-metric {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
}

.card-metric:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--text-secondary);
}

/* Skeleton Loading Fluido */
.skeleton {
  background: linear-gradient(90deg, var(--border-color) 25%, var(--bg-surface) 37%, var(--border-color) 63%);
  background-size: 400% 100%;
  animation: skeleton-loading 1.4s ease infinite;
  border-radius: 4px;
}

@keyframes skeleton-loading {
  0% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}