:root {
  --bg: #0e1013;
  --surface: #15181d;
  --surface-2: #1b1f25;
  --border: #262b33;
  --text: #d5d9e0;
  --muted: #8b93a1;
  --heading: #eef1f5;
  --accent: #7fb4ff;
  --accent-soft: rgba(127, 180, 255, 0.1);
  --ok: #7fd4a4;
  --warn: #e8c27a;
  --code-bg: #111418;
  --radius: 10px;
  --sidebar: 260px;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f8fa;
    --surface: #ffffff;
    --surface-2: #f0f2f5;
    --border: #dfe3e9;
    --text: #2b313b;
    --muted: #677080;
    --heading: #10141a;
    --accent: #2563c9;
    --accent-soft: rgba(37, 99, 201, 0.08);
    --ok: #1d7f4e;
    --warn: #8a5a00;
    --code-bg: #f3f5f8;
    color-scheme: light;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 24px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

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

.layout { display: flex; min-height: 100vh; }

/* Navegação lateral */
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  width: var(--sidebar);
  flex-shrink: 0;
  overflow-y: auto;
  padding: 28px 20px;
  border-right: 1px solid var(--border);
  background: var(--surface);
}
.brand { display: flex; align-items: center; gap: 10px; margin-bottom: 28px; color: var(--heading); font-weight: 600; }
.brand img { width: 28px; height: 28px; border-radius: 7px; }
.brand small { display: block; color: var(--muted); font-weight: 400; font-size: 12px; }
.sidebar h4 { margin: 22px 0 6px; font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar li a { display: block; padding: 5px 10px; border-radius: 6px; color: var(--text); font-size: 14px; }
.sidebar li a:hover { background: var(--accent-soft); color: var(--heading); text-decoration: none; }

/* Conteúdo */
main { flex: 1; min-width: 0; padding: 48px 56px 96px; max-width: 920px; }
section { padding-top: 12px; margin-bottom: 44px; }
h1 { margin: 0 0 12px; font-size: 32px; line-height: 1.2; color: var(--heading); font-weight: 650; }
h2 { margin: 0 0 14px; padding-top: 8px; font-size: 23px; color: var(--heading); font-weight: 600; }
h3 { margin: 28px 0 10px; font-size: 17px; color: var(--heading); font-weight: 600; }
p, li { color: var(--text); }
.lead { font-size: 18px; color: var(--muted); margin-bottom: 28px; }
hr { border: 0; border-top: 1px solid var(--border); margin: 40px 0; }

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 5px;
  overflow-wrap: anywhere;
}
pre {
  margin: 14px 0 20px;
  padding: 16px 18px;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.6;
}
pre code { background: none; border: 0; padding: 0; font-size: inherit; overflow-wrap: normal; }
.code-label { margin: 18px 0 -8px; font-size: 12px; color: var(--muted); font-family: var(--mono); }

.table-wrap { overflow-x: auto; margin: 14px 0 22px; border: 1px solid var(--border); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; font-size: 14.5px; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { background: var(--surface-2); color: var(--heading); font-weight: 600; font-size: 13px; }
tr:last-child td { border-bottom: 0; }
td code { white-space: nowrap; }

.note, .warn {
  margin: 18px 0;
  padding: 14px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  border-left-width: 3px;
  background: var(--surface);
  font-size: 15px;
}
.note { border-left-color: var(--accent); }
.warn { border-left-color: var(--warn); }
.note strong, .warn strong { color: var(--heading); }

.steps { counter-reset: step; list-style: none; padding: 0; }
.steps li { counter-increment: step; position: relative; padding-left: 40px; margin-bottom: 12px; }
.steps li::before {
  content: counter(step);
  position: absolute; left: 0; top: 1px;
  width: 26px; height: 26px; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent);
  font-size: 13px; font-weight: 600;
}

.checklist { list-style: none; padding: 0; }
.checklist li { position: relative; padding-left: 28px; margin-bottom: 8px; }
.checklist li::before { content: "✓"; position: absolute; left: 4px; color: var(--ok); font-weight: 700; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; margin: 20px 0; }
.card { display: block; padding: 18px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); color: var(--text); }
.card:hover { border-color: var(--accent); text-decoration: none; }
.card strong { display: block; color: var(--heading); margin-bottom: 4px; }
.card span { font-size: 14px; color: var(--muted); }

.badge { display: inline-block; font-family: var(--mono); font-size: 12px; padding: 1px 8px; border-radius: 99px; background: var(--accent-soft); color: var(--accent); }

footer { margin-top: 64px; padding-top: 20px; border-top: 1px solid var(--border); color: var(--muted); font-size: 13px; }

/* Celular: navegação vira bloco no topo */
@media (max-width: 860px) {
  .layout { display: block; }
  .sidebar { position: static; height: auto; width: auto; border-right: 0; border-bottom: 1px solid var(--border); padding: 20px 16px; }
  .sidebar nav { display: grid; grid-template-columns: 1fr 1fr; gap: 0 12px; }
  .sidebar h4 { margin-top: 12px; }
  main { padding: 32px 16px 72px; }
  h1 { font-size: 26px; }
  h2 { font-size: 21px; }
}