*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0a0c0f;
  --surface: #12151a;
  --border: #252a33;
  --text: #e8eaed;
  --text-dim: #8b919a;
  --amber: #f5a623;
  --green: #34d399;
}

body {
  font-family: 'DM Sans', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.guide {
  max-width: 760px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 4rem;
}

.guide-nav {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}

.guide-nav a {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 0.85rem;
  color: var(--text);
  text-decoration: none;
}

.guide-nav a span { color: var(--amber); }

.guide-cta {
  margin-left: auto;
  background: var(--amber);
  color: #0a0c0f;
  font-weight: 700;
  font-size: 0.75rem;
  padding: 0.55rem 1rem;
  border-radius: 6px;
  text-decoration: none;
}

h1 {
  font-size: clamp(1.7rem, 5vw, 2.4rem);
  line-height: 1.2;
  margin-bottom: 1rem;
}

h2 {
  font-size: 1.3rem;
  margin: 2.5rem 0 0.75rem;
  color: var(--amber);
}

h3 {
  font-size: 1.05rem;
  margin: 1.5rem 0 0.5rem;
}

p, li { color: var(--text-dim); margin-bottom: 0.9rem; }

.lede { font-size: 1.05rem; color: var(--text); }

ul, ol { padding-left: 1.25rem; }

li { margin-bottom: 0.4rem; }

a { color: var(--green); }

.callout {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--amber);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}

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

.sms-sample {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.8rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1.5rem;
  color: var(--text);
  overflow-x: auto;
}

.guide-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-dim);
}