:root {
  --bg: #fbfbfa;
  --surface: #ffffff;
  --text: #1a1a1a;
  --muted: #6b6b6b;
  --border: #e5e5e3;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --warn-bg: #fff7ed;
  --warn-border: #fb923c;
  --info-bg: #eff6ff;
  --info-border: #60a5fa;
  --stop-bg: #fef2f2;
  --stop-border: #ef4444;
  --code-bg: #0f172a;
  --code-text: #e2e8f0;
  --code-comment: #94a3b8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16161a;
    --surface: #1e1e23;
    --text: #ececec;
    --muted: #9a9a9a;
    --border: #2c2c33;
    --accent: #60a5fa;
    --accent-hover: #93c5fd;
    --warn-bg: #2a1d10;
    --warn-border: #d97706;
    --info-bg: #102036;
    --info-border: #3b82f6;
    --stop-bg: #2a1414;
    --stop-border: #dc2626;
    --code-bg: #0a0a0f;
    --code-text: #e2e8f0;
    --code-comment: #94a3b8;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.page {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

nav.crumb {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 32px;
}

nav.crumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px dotted var(--muted);
}

nav.crumb a:hover { color: var(--accent); border-color: var(--accent); }

h1 {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", system-ui, sans-serif;
  font-size: 36px;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
  font-weight: 700;
}

h2 {
  font-size: 24px;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 48px 0 12px;
  font-weight: 600;
}

h3 {
  font-size: 19px;
  margin: 32px 0 8px;
  font-weight: 600;
}

p { margin: 0 0 16px; }

.lede {
  font-size: 19px;
  color: var(--muted);
  margin-bottom: 32px;
}

a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; transition: border-color .15s; }
a:hover { border-bottom-color: var(--accent); }

ul, ol { padding-left: 24px; margin: 0 0 16px; }
li { margin-bottom: 8px; }
li > p { margin-bottom: 8px; }

strong { font-weight: 600; }

code {
  font-family: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, monospace;
  font-size: 0.92em;
  background: var(--border);
  padding: 1px 6px;
  border-radius: 4px;
}

pre {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 18px 20px;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.55;
  margin: 16px 0;
  position: relative;
}

pre code {
  background: transparent;
  padding: 0;
  font-size: inherit;
  color: inherit;
}

.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(255,255,255,.08);
  color: var(--code-text);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 12px;
  font-family: inherit;
  cursor: pointer;
  opacity: 1;
  transition: opacity .15s, background .15s;
}

@media (hover: hover) {
  .copy-btn { opacity: 0; }
  pre:hover .copy-btn { opacity: 1; }
}

.copy-btn:hover { background: rgba(255,255,255,.15); }
.copy-btn.copied { background: rgba(74, 222, 128, 0.25); color: #4ade80; }

.callout {
  margin: 20px 0;
  padding: 14px 18px;
  border-left: 3px solid;
  border-radius: 4px;
  font-size: 16px;
}

.callout p:last-child { margin-bottom: 0; }
.callout > strong:first-child { display: block; margin-bottom: 4px; font-size: 13px; text-transform: uppercase; letter-spacing: 0.04em; }

.callout.info { background: var(--info-bg); border-color: var(--info-border); }
.callout.warn { background: var(--warn-bg); border-color: var(--warn-border); }
.callout.stop { background: var(--stop-bg); border-color: var(--stop-border); }

.choice-grid {
  display: grid;
  gap: 16px;
  margin: 32px 0;
}

.choice {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 22px;
  color: var(--text);
  text-decoration: none;
  transition: border-color .15s, transform .15s, box-shadow .15s;
}

.choice:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0,0,0,.06);
}

.choice h3 { margin: 0 0 6px; font-size: 18px; }
.choice p { margin: 0; color: var(--muted); font-size: 15px; }
.choice .tag { display: inline-block; font-size: 12px; font-weight: 600; padding: 2px 8px; border-radius: 999px; margin-right: 8px; vertical-align: middle; }
.tag.go { background: #dcfce7; color: #166534; }
.tag.caution { background: #fef3c7; color: #92400e; }
.tag.stop { background: #fee2e2; color: #991b1b; }

@media (prefers-color-scheme: dark) {
  .tag.go { background: #14532d; color: #bbf7d0; }
  .tag.caution { background: #78350f; color: #fde68a; }
  .tag.stop { background: #7f1d1d; color: #fecaca; }
}

.next {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: 16px;
}

.next a {
  display: inline-block;
  padding: 10px 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-weight: 500;
}

.next a.primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.next a.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); border-bottom-color: var(--accent-hover); }
.next a:hover { border-bottom-color: var(--border); }

hr { border: none; border-top: 1px solid var(--border); margin: 40px 0; }

.glance {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 10px 24px;
  margin: 24px 0 32px;
  padding: 20px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.glance dt {
  font-weight: 600;
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  align-self: center;
}
.glance dd { margin: 0; align-self: center; font-size: 16px; }
.verdict-go { color: #16a34a; font-weight: 600; }
.verdict-caution { color: #c2410c; font-weight: 600; }
.verdict-stop { color: #dc2626; font-weight: 600; }
@media (prefers-color-scheme: dark) {
  .verdict-go { color: #4ade80; }
  .verdict-caution { color: #fb923c; }
  .verdict-stop { color: #f87171; }
}

.signup {
  margin: 32px 0;
  padding: 20px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.signup dl {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 8px 20px;
  margin: 0 0 16px;
}
.signup dt { font-weight: 600; color: var(--muted); font-size: 13px; align-self: baseline; }
.signup dd { margin: 0; }
.signup h3 { margin: 12px 0 8px; font-size: 15px; }
.signup ul { margin-bottom: 0; }

.matrix { margin: 24px 0 32px; overflow-x: auto; }
.matrix table { border-collapse: collapse; width: 100%; font-size: 15px; }
.matrix th, .matrix td {
  text-align: left;
  padding: 12px 14px;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
}
.matrix th {
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: var(--surface);
}
.matrix td a { display: inline-block; }
.matrix code { font-size: 13px; padding: 1px 5px; }
@media (max-width: 600px) {
  .matrix table { font-size: 14px; }
  .matrix th, .matrix td { padding: 10px 10px; }
}

footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--muted);
}

@media (max-width: 600px) {
  body { font-size: 16px; }
  .page { padding: 28px 18px 64px; }
  h1 { font-size: 28px; }
  h2 { font-size: 21px; margin-top: 36px; }
  h3 { font-size: 17px; margin-top: 24px; }
  .lede { font-size: 17px; margin-bottom: 24px; }
  pre { font-size: 13px; padding: 14px 16px; padding-top: 40px; }
  .copy-btn { padding: 5px 10px; }
  .next { flex-direction: column; }
  .next a { text-align: center; }
}