:root {
  --bg: #f6f8fc;
  --card: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --brand: #3d7eff;
  --brand-dark: #2f63cc;
  --line: #e5e7eb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background: linear-gradient(180deg, #f8fbff 0%, #f6f8fc 100%);
  color: var(--text);
}

.shell {
  max-width: 980px;
  margin: 0 auto;
  padding: 20px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  text-decoration: none;
  color: var(--text);
}

.brand-badge {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--brand);
}

.nav {
  display: flex;
  gap: 16px;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 500;
}

.nav a:hover {
  color: var(--text);
}

.hero {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 28px;
  background: var(--card);
  box-shadow: 0 8px 24px rgba(17, 24, 39, 0.06);
}

h1 {
  margin: 0 0 10px;
  font-size: 34px;
  line-height: 1.15;
}

h2 {
  margin: 22px 0 8px;
  font-size: 24px;
}

h3 {
  margin: 14px 0 6px;
  font-size: 18px;
}

p {
  line-height: 1.55;
}

.lead {
  color: var(--muted);
  font-size: 18px;
  margin: 0 0 20px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn {
  display: inline-block;
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 10px 14px;
  text-decoration: none;
  font-weight: 600;
}

.btn-primary {
  background: var(--brand);
  color: #fff;
}

.btn-primary:hover {
  background: var(--brand-dark);
}

.btn-secondary {
  border-color: var(--line);
  color: var(--text);
  background: #fff;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 16px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  background: #fff;
}

.card h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.content {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
  background: #fff;
}

.stack {
  display: grid;
  gap: 12px;
}

.two-col {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.muted {
  color: var(--muted);
}

.list {
  margin: 10px 0 10px 20px;
  padding: 0;
}

.list li {
  margin: 6px 0;
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 780px;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 10px;
  text-align: left;
  vertical-align: top;
  font-size: 14px;
}

th {
  background: #f3f5fa;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: #374151;
}

.notice {
  border: 1px solid #cde0ff;
  background: #f4f8ff;
  color: #1f3c72;
  border-radius: 10px;
  padding: 12px;
  font-size: 14px;
}

.steps {
  counter-reset: step;
  display: grid;
  gap: 12px;
  margin-top: 8px;
}

.step {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
  background: #fff;
}

.step h3 {
  margin: 0 0 6px;
}

.step h3::before {
  counter-increment: step;
  content: counter(step) ". ";
  color: var(--brand);
}

.form {
  display: grid;
  gap: 12px;
  margin-top: 12px;
}

.field {
  display: grid;
  gap: 6px;
}

.field label {
  font-size: 14px;
  color: #374151;
}

.field input,
.field textarea {
  border: 1px solid #d1d5db;
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
  font: inherit;
}

.field textarea {
  resize: vertical;
  min-height: 120px;
}

.form-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.small {
  font-size: 13px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-block;
  border: 1px solid #dbe5ff;
  background: #f4f8ff;
  color: #20407a;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 13px;
}

.footer {
  margin-top: 18px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 760px) {
  h1 {
    font-size: 28px;
  }

  h2 {
    font-size: 22px;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .two-col {
    grid-template-columns: 1fr;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }
}