:root {
  --bg: #f4f7f8;
  --card: #ffffff;
  --line: #d7e2e5;
  --ink: #1d2b31;
  --muted: #50656f;
  --primary: #0a6e82;
  --primary-soft: #e3f2f5;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.5;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: #0b5d72;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

.topbar-inner {
  max-width: 1220px;
  margin: 0 auto;
  padding: 12px 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.brand {
  color: #f3ffff;
  text-decoration: none;
  font-weight: 700;
}

.top-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.top-actions a {
  color: #dff8ff;
  text-decoration: none;
  font-weight: 600;
}

.layout {
  max-width: 1220px;
  margin: 0 auto;
  padding: 18px;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 18px;
}

.sidebar {
  position: sticky;
  top: 64px;
  align-self: start;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
}

.sidebar h2 {
  margin: 0 0 10px;
  color: var(--primary);
  font-size: 1rem;
}

.sidebar a {
  display: block;
  color: #244450;
  text-decoration: none;
  padding: 6px 0;
  border-bottom: 1px dashed #e2ecef;
  font-size: 0.94rem;
}

.sidebar a:last-child {
  border-bottom: 0;
}

.content {
  min-width: 0;
}

.doc-section {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px;
  margin-bottom: 14px;
}

h1,
h2,
h3 {
  margin-top: 0;
  color: var(--primary);
}

h1 {
  font-size: 1.6rem;
}

h2 {
  font-size: 1.25rem;
}

h3 {
  font-size: 1.03rem;
  margin-bottom: 8px;
}

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

table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0 14px;
  overflow: hidden;
  border-radius: 10px;
  border: 1px solid var(--line);
}

thead {
  background: var(--primary-soft);
}

th,
td {
  text-align: left;
  padding: 9px 10px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th {
  color: #154756;
  font-size: 0.93rem;
}

td {
  font-size: 0.92rem;
  color: #2e4b56;
}

pre {
  background: #0f2026;
  color: #e6f7ff;
  border-radius: 10px;
  padding: 12px;
  overflow: auto;
  margin: 10px 0 14px;
  border: 1px solid #2a4450;
}

code {
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.88rem;
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }
}