:root {
  --primary: #0f766e;
  --bg: #f8fafc;
  --text: #1e293b;
  --muted: #64748b;
  --radius: 8px;
  --space: 1rem;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space) 2rem;
  background: var(--primary);
  color: white;
}
.site-header nav { display: flex; gap: 1.5rem; }
.site-header nav a { color: white; text-decoration: none; }
.site-header nav a:hover { text-decoration: underline; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

section { margin-bottom: 3rem; }
section h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  border-bottom: 2px solid var(--primary);
  padding-bottom: 0.5rem;
}

.grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}
@media (min-width: 600px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1000px) {
  .grid { grid-template-columns: repeat(3, 1fr); }
}

.card {
  background: white;
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  transition: transform 0.15s ease;
}
.card:hover { transform: translateY(-2px); }

form {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-width: 480px;
}
form label { font-weight: 600; color: var(--muted); }
form input, form textarea {
  padding: 0.5rem 0.75rem;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius);
  font-size: 1rem;
}
form button {
  padding: 0.6rem 1rem;
  border: none;
  border-radius: var(--radius);
  background: var(--primary);
  color: white;
  font-weight: 600;
  cursor: pointer;
  align-self: flex-start;
}
form button:hover { background: #0e6862; }

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