:root {
  --bg: #f6f7fb;
  --panel: #ffffff;
  --fg: #11131a;
  --muted: #6b7280;
  --line: #e7e8ef;
  --accent: #4f46e5;
  --accent-2: #6366f1;
  --accent-soft: #eef0ff;
  --code-bg: #f1f2f8;
  --shadow: 0 1px 2px rgba(17, 19, 26, .04), 0 10px 30px rgba(17, 19, 26, .06);
  --radius: 16px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e0f14;
    --panel: #171922;
    --fg: #e8e9ef;
    --muted: #9aa0ad;
    --line: #262a36;
    --accent: #7c7bff;
    --accent-2: #8b8bff;
    --accent-soft: #23243a;
    --code-bg: #1c1f2a;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 12px 36px rgba(0,0,0,.35);
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font: 15px/1.55 -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: 720px;
  margin: 0 auto;
  padding: 56px 20px 80px;
}

/* ---------- hero ---------- */
.hero {
  text-align: center;
  padding: 20px 0 32px;
}
.hero h1 {
  margin: 10px 0 10px;
  font-size: 28px;
  letter-spacing: -.02em;
}
.hero .lead {
  color: var(--muted);
  max-width: 440px;
  margin: 0 auto 28px;
}
.logo-dot {
  width: 44px;
  height: 44px;
  margin: 0 auto;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 10px 24px color-mix(in oklab, var(--accent) 35%, transparent);
}
.hint {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- cards ---------- */
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px 24px 20px;
  margin: 20px 0;
}
.card h2 {
  margin: 0 0 14px;
  font-size: 17px;
  letter-spacing: -.01em;
}
.card p { margin: 8px 0; }
.card .muted { color: var(--muted); }
.card .small { font-size: 13px; }

/* ---------- steps ---------- */
.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 10px 0 0;
}
.steps > li {
  counter-increment: step;
  position: relative;
  padding: 14px 0 14px 44px;
  border-top: 1px solid var(--line);
}
.steps > li:first-child { border-top: 0; padding-top: 4px; }
.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 14px;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
  font-size: 13px;
}
.steps > li:first-child::before { top: 4px; }
.steps h3 { margin: 0 0 2px; font-size: 15px; font-weight: 600; }
.steps p { margin: 0; color: var(--muted); }
.steps.compact > li { padding-left: 44px; padding-top: 10px; padding-bottom: 10px; }

/* ---------- key/value ---------- */
.kv { list-style: none; padding: 0; margin: 10px 0 6px; }
.kv > li {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 12px;
  padding: 10px 0;
  border-top: 1px solid var(--line);
  align-items: center;
}
.kv > li:first-child { border-top: 0; }
.kv .k { color: var(--muted); font-size: 13px; }
.kv .v { font-weight: 500; }
.kv code.v {
  background: var(--code-bg);
  padding: 6px 10px;
  border-radius: 8px;
  font: 13px/1.3 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  word-break: break-all;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  transition: transform .05s, box-shadow .15s, background .15s;
}
.btn svg { width: 18px; height: 18px; }
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 20px color-mix(in oklab, var(--accent) 35%, transparent);
}
.btn-primary:hover { background: var(--accent-2); }
.btn-primary:active { transform: translateY(1px); }

/* ---------- inline code ---------- */
code {
  background: var(--code-bg);
  padding: 2px 7px;
  border-radius: 6px;
  font: 13.5px/1.4 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* ---------- footer ---------- */
.foot {
  margin-top: 32px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}
.foot a { color: var(--muted); text-decoration: none; border-bottom: 1px dashed var(--line); }
.foot a:hover { color: var(--fg); }
.foot .dot { margin: 0 8px; opacity: .5; }

/* ---------- small screens ---------- */
@media (max-width: 520px) {
  .page { padding: 32px 16px 56px; }
  .kv > li { grid-template-columns: 1fr; gap: 4px; }
  .kv .k { font-size: 12px; }
}