:root {
  --bg: #eef3f9;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --brand: #9dcb3b;
  --brand-dark: #7faa2c;
  --line: #d6e0eb;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top right, rgba(157, 203, 59, 0.14), transparent 35%),
    radial-gradient(circle at bottom left, rgba(125, 166, 44, 0.08), transparent 30%),
    var(--bg);
  line-height: 1.55;
}
.wrap { width: min(1060px, 92%); margin: 0 auto; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
}
.brand {
  font-weight: 800;
  letter-spacing: 0.2px;
}
nav a {
  margin-left: 14px;
  color: #334155;
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
}

nav a:hover {
  color: #0f172a;
}

.hero {
  background: linear-gradient(135deg, #9dcb3b 0%, #84b231 55%, #6f9e2a 100%);
  color: #fff;
  padding: 68px 0 62px;
  box-shadow: inset 0 -1px 0 rgba(255, 255, 255, 0.25);
}
.hero h1 {
  margin: 0 0 10px;
  font-size: clamp(30px, 5vw, 42px);
  line-height: 1.18;
}
.hero p {
  margin: 0 0 18px;
  max-width: 820px;
  font-size: 16px;
}
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  border: 1px solid rgba(255,255,255,.7);
  color: #fff;
  text-decoration: none;
  padding: 11px 16px;
  border-radius: 12px;
  font-weight: 600;
  transition: all .2s ease;
}
.btn.primary { background: #0f172a; border-color: #0f172a; }
.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.18);
}

.stack {
  padding: 26px 0 42px;
  display: grid;
  gap: 16px;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 6px 24px rgba(15, 23, 42, 0.05);
  content-visibility: auto;
  contain-intrinsic-size: 1px 650px;
}
.card h2 {
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 24px;
  letter-spacing: .1px;
}
.card h3 {
  margin: 16px 0 8px;
  font-size: 18px;
  color: #1e293b;
}
.card p {
  margin-top: 0;
  color: #334155;
}
.card ul, .card ol { padding-left: 22px; }
.card li { margin-bottom: 8px; }
.image-frame {
  margin-top: 10px;
  background: #f8fafc;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px;
}

.image-frame img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 10px;
  object-fit: cover;
}

.note {
  background: #f6faea;
  border: 1px solid #d8e7b2;
  color: #243141;
  border-radius: 10px;
  padding: 10px 12px;
}

pre {
  background: #0b1326;
  color: #dbe6f4;
  padding: 14px;
  border-radius: 10px;
  overflow-x: auto;
  font-size: 13px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}
code {
  font-family: Consolas, monospace;
  background: rgba(15, 23, 42, 0.06);
  padding: 2px 5px;
  border-radius: 6px;
}
pre code {
  background: transparent;
  padding: 0;
}

.footer {
  padding: 2px 0 34px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

@media (max-width: 760px) {
  .hero { padding: 52px 0 48px; }
  .hero h1 { font-size: 28px; }
  nav { display: none; }
  .card { padding: 16px; }
}