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

:root {
  --bg:       #18181b;
  --surface:  #27272a;
  --border:   #3f3f46;
  --text:     #ffffff;
  --muted:    #a1a1aa;
  --accent:   #ffffff;
  --max:      720px;
}

html { font-size: 16px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: inherit; text-decoration: underline; text-underline-offset: 3px; }
a:hover { opacity: .75; }

/* ── Layout ── */

header {
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
}

header nav {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 2rem;
}

header nav .logo {
  font-weight: 600;
  font-size: .9rem;
  letter-spacing: .04em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--text);
  flex: 1;
}

header nav a {
  font-size: .875rem;
  color: var(--muted);
  text-decoration: none;
}
header nav a:hover { color: var(--text); opacity: 1; }

main {
  flex: 1;
  max-width: var(--max);
  width: 100%;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem;
  text-align: center;
  font-size: .8rem;
  color: var(--muted);
}

footer a { color: var(--muted); }
footer .disclaimer { font-size: .7rem; margin-top: .5rem; opacity: .6; }

/* ── Typography ── */

h1 { font-size: 2.25rem; font-weight: 700; line-height: 1.2; }
h2 { font-size: 1.25rem; font-weight: 600; margin-top: 2.5rem; margin-bottom: .75rem; }
h3 { font-size: 1rem; font-weight: 600; margin-top: 1.5rem; margin-bottom: .35rem; }
p  { color: var(--muted); margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

ul, ol { padding-left: 1.4rem; color: var(--muted); }
li { margin-bottom: .35rem; }

/* ── Hero ── */

.hero { padding: 4rem 0 3rem; border-bottom: 1px solid var(--border); margin-bottom: 3rem; }
.hero .tagline { font-size: 1.1rem; color: var(--muted); margin-top: .75rem; max-width: 480px; }
.hero .badge {
  display: inline-block;
  margin-top: 2rem;
  background: var(--text);
  color: var(--bg);
  padding: .6rem 1.4rem;
  border-radius: 8px;
  font-size: .875rem;
  font-weight: 600;
  text-decoration: none;
}
.hero .badge:hover { opacity: .85; }

/* ── Feature grid ── */

.features { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; margin-top: 1rem; }

.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem 1.25rem 1rem;
}

.feature h3 { margin-top: 0; color: var(--text); }
.feature p  { font-size: .875rem; margin: 0; }

@media (max-width: 540px) {
  .features { grid-template-columns: 1fr; }
  h1 { font-size: 1.75rem; }
}

/* ── Steps (setup guide) ── */

.steps { counter-reset: step; list-style: none; padding: 0; margin-top: 1rem; }
.steps li {
  counter-increment: step;
  display: flex;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
}
.steps li:last-child { border-bottom: none; }
.steps li::before {
  content: counter(step);
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .8rem;
  font-weight: 600;
  color: var(--text);
  margin-top: .1rem;
}
.steps li strong { color: var(--text); display: block; margin-bottom: .2rem; }

/* ── Callout ── */

.callout {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  margin: 1.5rem 0;
}
.callout p { margin: 0; font-size: .875rem; }

code {
  font-family: ui-monospace, "SF Mono", monospace;
  font-size: .85em;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: .1em .4em;
  color: var(--text);
}