:root {
  --bg: #0f1115;
  --bg-card: #181b22;
  --bg-elev: #20242d;
  --fg: #e7e9ee;
  --fg-dim: #9aa1ad;
  --accent: #5b9dff;
  --accent-2: #7dd3a8;
  --border: #262b35;
  --warn-bg: #2a2519;
  --warn-border: #5a4a1f;
  --warn-fg: #f0d27a;
  --radius: 12px;
  --maxw: 880px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

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

code {
  background: var(--bg-elev);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

/* hero */
.hero {
  padding: 56px 0 32px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #1a1f2b 0%, var(--bg) 100%);
}
.hero h1 {
  margin: 0 0 8px;
  font-size: 36px;
  letter-spacing: -0.5px;
}
.hero .lead {
  margin: 0 0 24px;
  font-size: 18px;
  color: var(--fg-dim);
}
.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.toc a {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 14px;
  color: var(--fg);
}
.toc a:hover {
  border-color: var(--accent);
  text-decoration: none;
}

/* sections */
section {
  padding: 48px 0;
  border-bottom: 1px solid var(--border);
}
section h2 {
  font-size: 28px;
  margin: 0 0 8px;
  letter-spacing: -0.3px;
}
section > p {
  color: var(--fg-dim);
  margin: 0 0 28px;
}

h3 {
  font-size: 18px;
  margin: 0 0 8px;
}

/* steps */
.step {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 16px;
  margin: 24px 0;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.step-num {
  font-weight: 700;
  font-size: 20px;
  color: var(--accent);
  background: var(--bg-elev);
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.step-body p { margin: 0 0 12px; }
.step-body p:last-child { margin-bottom: 0; }

/* figure / screenshots */
figure {
  margin: 16px 0 0;
  background: var(--bg-elev);
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 12px;
}
figure img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  background: #0a0c10;
}
figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: var(--fg-dim);
  text-align: center;
}

/* placeholder when image is missing */
figure img:not([src]),
figure img[src=""],
figure img[alt]:after {
  /* fallback handled visually by border */
}

/* callout */
.callout {
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  color: var(--warn-fg);
  border-radius: 8px;
  padding: 12px 14px;
  margin: 12px 0;
  font-size: 14px;
}
.callout b { color: #f7e0a3; }

/* helpers */
.muted {
  color: var(--fg-dim);
  font-size: 14px;
}

/* lists inside steps */
.step-body ol,
.step-body ul {
  margin: 8px 0 12px;
  padding-left: 22px;
}
.step-body li { margin: 4px 0; }

/* faq */
details {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  margin: 8px 0;
}
details summary {
  cursor: pointer;
  font-weight: 500;
  list-style: none;
}
details summary::-webkit-details-marker { display: none; }
details summary::before {
  content: "▸ ";
  color: var(--accent);
  display: inline-block;
  transition: transform 0.15s;
}
details[open] summary::before {
  content: "▾ ";
}
details p, details ol { margin: 12px 0 0; color: var(--fg-dim); }
details ol { padding-left: 20px; }

/* footer */
footer {
  padding: 24px 0;
  color: var(--fg-dim);
  font-size: 14px;
  text-align: center;
}

/* mobile */
@media (max-width: 600px) {
  .hero { padding: 32px 0 20px; }
  .hero h1 { font-size: 28px; }
  .step {
    grid-template-columns: 1fr;
    padding: 16px;
  }
  .step-num {
    width: 40px;
    height: 40px;
    font-size: 16px;
  }
}