:root {
  --bg: #f7f8fb;
  --card: #ffffff;
  --text: #172033;
  --muted: #5f6b7a;
  --border: #dfe5ee;
  --accent: #23395d;
  --accent-2: #34568a;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 20px;
}
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 0;
  gap: 20px;
}
.brand {
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  font-size: 1.2rem;
}
nav a {
  color: var(--text);
  text-decoration: none;
  margin-left: 16px;
  font-size: 0.95rem;
}
nav a:hover { text-decoration: underline; }
.hero {
  padding: 80px 0 60px;
  text-align: left;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.1;
  margin: 0 0 18px;
}
.hero p {
  color: var(--muted);
  font-size: 1.15rem;
  max-width: 720px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 26px;
  margin: 22px 0;
  box-shadow: 0 8px 24px rgba(22, 30, 50, 0.05);
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}
.button {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 12px 18px;
  border-radius: 8px;
  margin-top: 10px;
}
.button:hover { background: var(--accent-2); }
.notice {
  border-left: 4px solid var(--accent);
  background: #eef3fb;
  padding: 14px 18px;
  margin: 20px 0;
}
footer {
  margin-top: 60px;
  border-top: 1px solid var(--border);
  background: var(--card);
  color: var(--muted);
  font-size: 0.9rem;
}
footer .container { padding: 24px 20px; }
footer a { color: var(--muted); }
small, .muted { color: var(--muted); }
@media (max-width: 640px) {
  .nav { align-items: flex-start; flex-direction: column; }
  nav a { margin-left: 0; margin-right: 12px; display: inline-block; margin-bottom: 8px; }
  .hero { padding: 52px 0 36px; }
}