* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  line-height: 1.5;
  color: #1f2937;
  background: #f8fafc;
}

a {
  color: #0369a1;
}

.site-header {
  background: #ffffff;
  border-bottom: 1px solid #e5e7eb;
  padding: 0.8rem 1.2rem;
  position: sticky;
  top: 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: #0f172a;
  font-weight: 600;
}

.brand img {
  height: 36px;
}

.page-wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.2rem;
}

.hero {
  background: linear-gradient(135deg, #da291c, #f97316);
  color: #fff;
  border-radius: 12px;
  padding: 2rem 1.5rem;
}

.hero-inner {
  max-width: 800px;
}

.cards {
  margin-top: 1.2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 1rem;
}

.button {
  display: inline-block;
  margin-top: 0.6rem;
  background: #0f766e;
  color: #fff;
  text-decoration: none;
  padding: 0.5rem 0.8rem;
  border-radius: 6px;
}

.sidebar {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 0.8rem;
  height: fit-content;
}

.sidebar-group h3 {
  margin: 0.2rem 0 0.5rem;
  font-size: 1rem;
}

.sidebar-group ul {
  padding-left: 1.1rem;
  margin: 0;
}

.content {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 1.2rem;
}

.content-full {
  max-width: 900px;
}

.content img {
  max-width: 100%;
  height: auto;
}

.not-found {
  text-align: center;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 2rem;
}

.site-footer {
  text-align: center;
  color: #475569;
  padding: 2rem 1rem;
}

@media (max-width: 900px) {
  .content-shell {
    grid-template-columns: 1fr;
  }
}