:root {
  /* Brand colors */
  --green: #3B8C4A;
  --bluegray: #5D8BAA;
  --dark-gray: #1F2427;
  --medium-gray: #3E484F;
  --off-white: #EAEAEA;

  /* Light mode defaults */
  --primary: var(--green);
  --secondary: var(--bluegray);
  --bg: #f8fafc;
  --text: #0f172a;
  --card-bg: #ffffff;
  --shadow: rgba(0, 0, 0, 0.1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary: var(--green);
    --secondary: var(--bluegray);
    --bg: var(--dark-gray);
    --text: var(--off-white);
    --card-bg: var(--medium-gray);
    --shadow: rgba(255, 255, 255, 0.05);
  }
}

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

body {
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
}

header {
  background: var(--primary);
  color: white;
  text-align: center;
  padding: 2rem 1rem;
  transition: background 0.3s;
}

header .logo {
  width: 100px;
  height: auto;
  margin-bottom: 1rem;
  border-radius: 12px;
}

header h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  letter-spacing: 0.5px;
}

header p {
  font-size: 1.1rem;
  opacity: 0.9;
}

main {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
}

section {
  background: var(--card-bg);
  border-radius: 10px;
  box-shadow: 0 2px 6px var(--shadow);
  padding: 1.5rem;
  margin-bottom: 2rem;
  transition: background 0.3s, box-shadow 0.3s;
}

h2 {
  color: var(--primary);
  margin-bottom: 1rem;
}

ul {
  list-style: disc;
  margin-left: 1.5rem;
}

footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.9rem;
  color: var(--secondary);
}

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

a:hover {
  text-decoration: underline;
}