:root {
  --primary-color: #009ecb;
  --primary-dark: #102a43;
  --background: #f6faff;
  --card-bg: #ffffff;
  --border-color: #d5e5f0;
  --header-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

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

body {
  font-family: 'Segoe UI', Arial, -apple-system, sans-serif;
  background: var(--background);
  color: var(--primary-dark);
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

a {
  text-decoration: none;
  color: var(--primary-color);
  transition: opacity 0.2s;
}

a:hover {
  opacity: 0.8;
}

/* Header & Navigation Common */
header {
  background: var(--card-bg);
  padding: 15px 20px;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.brand {
  font-size: 1.6rem;
  font-weight: bold;
  color: var(--primary-dark);
}

.brand .accent {
  color: var(--primary-color);
}

/* Footer Common */
footer {
  background: var(--card-bg);
  border-top: 1px solid var(--border-color);
  padding: 60px 20px;
  margin-top: 60px;
  text-align: center;
  color: #666;
}

.footer-content {
  max-width: 800px;
  margin: 0 auto;
}