* {
  box-sizing: border-box;
}

:root {
  --bg: #f4f7f5;
  --surface: #ffffff;
  --text: #173126;
  --muted: #5e7167;
  --primary: #1f5233;
  --primary-soft: #e8f1eb;
  --border: #dbe6de;
  --warning: #fff6dd;
}

body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

header {
  background: linear-gradient(135deg, #163c27, #245c3a);
  color: white;
  padding: 24px 20px 36px;
}

.nav {
  max-width: 960px;
  margin: 0 auto 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-size: 1.25rem;
  font-weight: 700;
}

nav a {
  color: white;
  text-decoration: none;
  margin-left: 14px;
  font-weight: 600;
}

.hero {
  max-width: 960px;
  margin: 0 auto;
}

.hero h1 {
  margin: 0 0 8px;
  font-size: 2rem;
}

.hero p {
  margin: 0;
  color: #e5f0e9;
  max-width: 720px;
}

main {
  max-width: 960px;
  margin: -18px auto 0;
  padding: 0 20px 32px;
}

.card,
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 20px;
  box-shadow: 0 8px 24px rgba(20, 40, 28, 0.04);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 16px;
}

h2, h3 {
  color: var(--primary);
}

a.button {
  display: inline-block;
  padding: 10px 14px;
  border-radius: 12px;
  background: var(--primary);
  color: white;
  text-decoration: none;
  font-weight: 600;
}

.note {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--warning);
  border: 1px solid #f1df9b;
}

ul {
  padding-left: 20px;
}

footer {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px 30px;
  color: var(--muted);
  font-size: 0.95rem;
}

.small {
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 640px) {
  .nav {
    flex-direction: column;
    align-items: flex-start;
  }

  nav a {
    margin: 0 12px 0 0;
  }

  .hero h1 {
    font-size: 1.7rem;
  }
}