* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  background: url('/assets/img/bg.jpg') no-repeat center center fixed;
  background-size: cover;
  color: #111827;
}
header {
  background: rgba(17, 24, 39, 0.85);
  color: #f9fafb;
  padding: 1rem 1.5rem;
}
header h1 {
  margin: 0;
  font-size: 1.4rem;
}
nav {
  margin-top: 0.25rem;
}
nav a {
  color: #e5e7eb;
  margin-right: 1rem;
  text-decoration: none;
  font-size: 0.9rem;
}
nav a:hover {
  text-decoration: underline;
}
main {
  max-width: 900px;
  margin: 2rem auto;
  padding: 1.5rem;
  background: rgba(255, 255, 255, 0.92);
  border-radius: 0.75rem;
  box-shadow: 0 18px 45px rgba(15, 23, 42, 0.35);
}
.tag {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  background: #e0f2fe;
  color: #0369a1;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.7rem;
  margin-bottom: 0.8rem;
}
.notice {
  padding: 0.9rem 1rem;
  border-radius: 0.75rem;
  background: #fef3c7;
  border: 1px solid #fbbf24;
  color: #92400e;
  font-size: 0.9rem;
  margin-bottom: 1rem;
}
.card {
  border-radius: 0.75rem;
  border: 1px solid #e5e7eb;
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
  background: rgba(255, 255, 255, 0.95);
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.3rem;
  border-radius: 999px;
  background: #111827;
  color: #f9fafb;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  border: none;
  cursor: pointer;
  margin-top: 0.5rem;
}
.btn.secondary {
  background: #e5e7eb;
  color: #111827;
}
.btn:hover {
  opacity: 0.92;
}
.small {
  font-size: 0.8rem;
  color: #6b7280;
}
footer {
  text-align: center;
  font-size: 0.8rem;
  color: #e5e7eb;
  padding: 1.5rem 0;
}