:root {
    --font-family: 'Inter', system-ui, sans-serif;
    --font-size-base: 16px;
    --color-bg: #f9fafb;
    --color-text: #1f2937;
    --color-accent: #2563eb;
    --color-muted: #6b7280;
    --radius: 12px;
    --shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
  }

  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
  }
  
  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
  }
  
  .grid {
    display: grid;
    gap: 1.5rem;
  }
  
  .flex {
    display: flex;
    align-items: center;
    gap: 1rem;
  }
  
  h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 0.5rem;
  }
  
  p {
    margin-bottom: 1rem;
    color: var(--color-muted);
  }
  
  .button {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    background: var(--color-accent);
    color: #fff;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    box-shadow: var(--shadow);
    border: none;
  }
  
  .button:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
  }
  
  .card {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    transition: transform 0.2s ease;
  }
  
  .card:hover {
    transform: translateY(-4px);
  }

  @media (prefers-color-scheme: dark) {
    :root {
      --color-bg: #111827;
      --color-text: #f9fafb;
      --color-muted: #9ca3af;
      --color-accent: #3b82f6;
    }
  
    .card {
      background: #1f2937;
    }
  }