:root {
  --bg: #f7f7f8;
  --card: #fff;
  --text: #111827;
  --muted: #64748b;
  --line: #e5e7eb;
  --brand: #111827;
  --accent: #7e22ce;
  --warn-bg: #fff7ed;
  --warn-line: #fed7aa;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  line-height: 1.65;
}

a {
  color: var(--accent);
  font-weight: 800;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 22px;
  background: rgba(255, 255, 255, .92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.topbar strong {
  font-size: 20px;
}

.topbar nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.shell {
  width: min(1080px, calc(100% - 28px));
  margin: 28px auto 64px;
}

.hero {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--card);
  box-shadow: 0 12px 30px rgba(15, 23, 42, .06);
}

.hero h1 {
  margin: 0 0 8px;
  font-size: clamp(30px, 5vw, 48px);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero p {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  font-size: 17px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.card, .article {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--card);
}

.card {
  display: block;
  min-height: 150px;
  padding: 18px;
  color: var(--text);
}

.card span {
  display: inline-block;
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 900;
}

.card h2 {
  margin: 0 0 8px;
  font-size: 20px;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.article {
  padding: 28px;
}

.article h1 {
  margin-top: 0;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.12;
}

.article h2 {
  margin-top: 34px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.step, .note, .warning {
  margin: 12px 0;
  padding: 14px 16px;
  border-radius: 14px;
  background: #f8fafc;
}

.warning {
  border: 1px solid var(--warn-line);
  background: var(--warn-bg);
}

.note {
  border: 1px solid #dbeafe;
  background: #eff6ff;
}

code {
  padding: 2px 6px;
  border-radius: 7px;
  background: #f1f5f9;
  color: #0f172a;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 14px 0;
  overflow: hidden;
  border-radius: 14px;
}

th, td {
  padding: 10px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: #f8fafc;
}

.footer {
  margin-top: 28px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 700px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .article, .hero {
    padding: 18px;
  }
}