:root {
  --color-primary: #06b6d4;
  --color-primary-dark: #0891b2;
  --color-text: #1f2937;
  --color-text-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-bg: #ffffff;
  --color-bg-alt: #f9fafb;
  --color-code-bg: #f3f4f6;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --max-content: 780px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  font-size: 16px;
}

a {
  color: var(--color-primary-dark);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 260px;
  flex-shrink: 0;
  border-right: 1px solid var(--color-border);
  padding: 28px 20px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  background: var(--color-bg-alt);
}

.sidebar-brand {
  display: block;
  font-weight: 700;
  font-size: 18px;
  color: var(--color-text);
  margin-bottom: 4px;
}

.sidebar-brand:hover {
  text-decoration: none;
}

.sidebar-subtitle {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 28px;
}

.sidebar-group {
  margin-bottom: 22px;
}

.sidebar-group-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.sidebar-nav {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar-nav li {
  margin: 2px 0;
}

.sidebar-nav a {
  display: block;
  padding: 6px 10px;
  border-radius: 6px;
  color: var(--color-text);
  font-size: 14px;
}

.sidebar-nav a:hover {
  background: var(--color-border);
  text-decoration: none;
}

.sidebar-nav a.active {
  background: var(--color-primary);
  color: #ffffff;
}

.content {
  flex: 1;
  padding: 48px 56px;
  max-width: calc(var(--max-content) + 112px);
  margin: 0 auto;
  width: 100%;
}

.content h1 {
  font-size: 34px;
  font-weight: 700;
  margin: 0 0 8px;
  letter-spacing: -0.02em;
}

.content h2 {
  font-size: 24px;
  font-weight: 600;
  margin: 40px 0 12px;
  letter-spacing: -0.01em;
  padding-top: 8px;
}

.content h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 28px 0 8px;
}

.content p {
  margin: 0 0 16px;
}

.content ul,
.content ol {
  margin: 0 0 16px;
  padding-left: 22px;
}

.content li {
  margin-bottom: 6px;
}

.lead {
  font-size: 18px;
  color: var(--color-text-muted);
  margin-bottom: 32px;
}

.screenshot {
  margin: 24px 0;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.screenshot img {
  display: block;
  width: 100%;
}

.screenshot-caption {
  font-size: 13px;
  color: var(--color-text-muted);
  padding: 10px 14px;
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  margin: 0;
}

.callout {
  padding: 14px 18px;
  border-radius: 8px;
  border-left: 4px solid var(--color-primary);
  background: #ecfeff;
  margin: 20px 0;
}

.callout-title {
  font-weight: 600;
  margin-bottom: 4px;
}

.callout p:last-child {
  margin-bottom: 0;
}

.callout.warning {
  border-left-color: #f59e0b;
  background: #fffbeb;
}

.callout.note {
  border-left-color: #6366f1;
  background: #eef2ff;
}

.pager {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.pager a {
  display: block;
  padding: 14px 18px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  flex: 1;
  max-width: 260px;
  transition: border-color 120ms ease;
}

.pager a:hover {
  border-color: var(--color-primary);
  text-decoration: none;
}

.pager-label {
  display: block;
  font-size: 12px;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}

.pager-title {
  display: block;
  font-weight: 600;
  color: var(--color-text);
}

.pager .next {
  text-align: right;
  margin-left: auto;
}

code {
  font-family: "SF Mono", Menlo, Monaco, Consolas, monospace;
  font-size: 13px;
  background: var(--color-code-bg);
  padding: 2px 6px;
  border-radius: 4px;
}

kbd {
  font-family: var(--font-sans);
  font-size: 12px;
  padding: 2px 6px;
  border: 1px solid var(--color-border);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: var(--color-bg-alt);
}

.hero-card {
  padding: 28px 32px;
  background: linear-gradient(135deg, #ecfeff 0%, #f0f9ff 100%);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  margin: 24px 0 8px;
}

.hero-card h2 {
  margin-top: 0;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
  margin: 24px 0;
}

.step-card {
  padding: 18px 20px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-bg);
}

.step-card-num {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-primary-dark);
  background: #ecfeff;
  padding: 2px 8px;
  border-radius: 999px;
  margin-bottom: 8px;
}

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

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

table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 14px;
}

th,
td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--color-border);
}

th {
  background: var(--color-bg-alt);
  font-weight: 600;
}

.tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 500;
}

.tag-green {
  background: #dcfce7;
  color: #166534;
}

.tag-yellow {
  background: #fef9c3;
  color: #854d0e;
}

.tag-orange {
  background: #ffedd5;
  color: #9a3412;
}

.tag-red {
  background: #fee2e2;
  color: #991b1b;
}

.footer {
  margin-top: 72px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  font-size: 13px;
  color: var(--color-text-muted);
}

@media (max-width: 900px) {
  .layout {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    height: auto;
    position: static;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    padding: 20px;
  }

  .content {
    padding: 32px 20px;
  }
}