:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --text: #1f2a37;
  --muted: #5b6b7b;
  --accent: #2563eb;
}

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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

.container {
  width: min(960px, 90%);
  margin: 0 auto;
}

.site-header,
.site-footer {
  padding: 2rem 0;
  background: #0f172a;
  color: #fff;
}

.site-header h1 {
  font-size: 2rem;
}

.site-header p {
  color: #cbd5f5;
}

main {
  padding: 3rem 0;
}

.card {
  background: var(--card);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.1);
}

.card h2 {
  margin-bottom: 0.5rem;
}

.card p {
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.button {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.3);
}