:root {
  --accent: #3b82f6;
  --accent-dark: #2563eb;
  --bg: #ffffff;
  --surface: #f9fafb;
  --surface-strong: #f3f4f6;
  --border: #e5e7eb;
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --max-width: 720px;
  --radius: 14px;
  --radius-sm: 8px;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  color: var(--text-primary);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 28px 20px 80px;
}

header.page-header {
  padding-top: 8px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
}

header.page-header .eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 8px;
}

header.page-header h1 {
  margin: 0 0 10px;
  font-size: 28px;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

header.page-header p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 16px;
}

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

a:hover,
a:focus-visible {
  color: var(--accent-dark);
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.choice-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}

@media (min-width: 560px) {
  .choice-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.choice-card {
  display: block;
  padding: 22px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  transition: border-color 120ms ease, transform 120ms ease;
}

.choice-card:hover,
.choice-card:focus-visible {
  border-color: var(--accent);
  color: var(--text-primary);
  text-decoration: none;
  transform: translateY(-1px);
}

.choice-card h2 {
  margin: 0 0 6px;
  font-size: 19px;
  letter-spacing: -0.005em;
}

.choice-card p {
  margin: 0 0 12px;
  color: var(--text-secondary);
  font-size: 15px;
}

.choice-card .read-time {
  font-size: 13px;
  color: var(--text-tertiary);
}

.choice-card .arrow {
  display: inline-block;
  margin-left: 4px;
  transition: transform 160ms ease;
}

.choice-card:hover .arrow,
.choice-card:focus-visible .arrow {
  transform: translateX(3px);
}

.step {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 14px;
  margin: 0 0 32px;
}

.step-number {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  font-weight: 600;
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.step-content h3 {
  margin: 4px 0 8px;
  font-size: 19px;
  line-height: 1.3;
  letter-spacing: -0.005em;
}

.step-content p {
  margin: 0 0 14px;
  color: var(--text-primary);
}

.step-content p + p {
  margin-top: -6px;
}

.step-content .note {
  margin: 0 0 14px;
  padding: 12px 14px;
  background: var(--surface);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 15px;
  color: var(--text-secondary);
}

.step-content .note strong {
  color: var(--text-primary);
}

.screenshot {
  display: block;
  width: 100%;
  margin: 14px 0 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--surface);
}

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

.screenshot-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
  padding: 24px;
  text-align: center;
  background: var(--surface);
  border: 2px dashed var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-tertiary);
  font-size: 14px;
  margin: 14px 0 0;
}

.screenshot-placeholder code {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--text-secondary);
}

.callout {
  margin: 32px 0;
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.callout h3 {
  margin: 0 0 6px;
  font-size: 17px;
}

.callout p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 15px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 0;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 18px;
  background: var(--accent);
  color: white;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 500;
  text-decoration: none;
  transition: background 120ms ease;
}

.button:hover,
.button:focus-visible {
  background: var(--accent-dark);
  color: white;
  text-decoration: none;
}

.button.secondary {
  background: transparent;
  color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--border);
}

.button.secondary:hover,
.button.secondary:focus-visible {
  background: var(--surface);
  color: var(--accent-dark);
  box-shadow: inset 0 0 0 1px var(--accent);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.back-link::before {
  content: "←";
  display: inline-block;
}

.back-link:hover,
.back-link:focus-visible {
  color: var(--accent);
  text-decoration: none;
}

code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas,
    monospace;
  font-size: 0.92em;
  padding: 2px 6px;
  background: var(--surface-strong);
  border-radius: 4px;
}

footer.page-footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-tertiary);
  text-align: center;
}

@media (prefers-color-scheme: dark) {
  :root {
    --accent: #60a5fa;
    --accent-dark: #93c5fd;
    --bg: #0b0f14;
    --surface: #161c24;
    --surface-strong: #1e252e;
    --border: #2a313b;
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-tertiary: #6b7280;
  }

  .button {
    color: #0b0f14;
  }
}