:root {
  --bg: #f4f1ea;
  --paper: #fffdf8;
  --ink: #1d232a;
  --muted: #5b6570;
  --line: #d9d3c5;
  --accent: #c2410c;
  --accent-soft: #fde9dc;
  --eco: #15803d;
  --eco-soft: #dcf3e3;
  --ok: #15803d;
  --ok-soft: #dcf3e3;
  --warn: #a16207;
  --warn-soft: #fbf0cf;
  --danger: #b91c1c;
  --danger-soft: #fbe1e1;
  --code-bg: #efeadf;
  --wire-power: #c2410c;
  --wire-3v3: #2563eb;
  --wire-i2c: #7c3aed;
  --wire-sig: #0f766e;
  --shadow: 0 1px 0 rgba(0,0,0,.04), 0 6px 20px -12px rgba(0,0,0,.18);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12161b; --paper: #1a2027; --ink: #e8e4da; --muted: #9aa4ae; --line: #2e3742;
    --accent: #fb923c; --accent-soft: #3a2316; --eco: #4ade80; --eco-soft: #13301f;
    --ok: #4ade80; --ok-soft: #13301f; --warn: #facc15; --warn-soft: #332b10;
    --danger: #f87171; --danger-soft: #3a1717; --code-bg: #232a33;
    --wire-power: #fb923c; --wire-3v3: #60a5fa; --wire-i2c: #a78bfa; --wire-sig: #2dd4bf; --shadow: none;
  }
}
:root[data-theme="dark"] {
  --bg: #12161b; --paper: #1a2027; --ink: #e8e4da; --muted: #9aa4ae; --line: #2e3742;
  --accent: #fb923c; --accent-soft: #3a2316; --eco: #4ade80; --eco-soft: #13301f;
  --ok: #4ade80; --ok-soft: #13301f; --warn: #facc15; --warn-soft: #332b10;
  --danger: #f87171; --danger-soft: #3a1717; --code-bg: #232a33;
  --wire-power: #fb923c; --wire-3v3: #60a5fa; --wire-i2c: #a78bfa; --wire-sig: #2dd4bf; --shadow: none;
}

/* conteúdo específico de cada versão */
html[data-perfil="eco"] .full { display: none !important; }
html[data-perfil="full"] .eco { display: none !important; }

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.6 "IBM Plex Sans", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}
code, kbd, .mono { font-family: "IBM Plex Mono", ui-monospace, monospace; font-size: .9em; }
code { background: var(--code-bg); padding: .1em .35em; border-radius: 4px; }
kbd { border: 1px solid var(--line); border-bottom-width: 2px; padding: 0 .4em; border-radius: 4px; background: var(--paper); }
a { color: var(--accent); }

/* ---------- topo ---------- */
.topbar {
  position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px); border-bottom: 1px solid var(--line);
}
.topbar-inner { max-width: 1180px; margin: 0 auto; padding: 10px 16px; display: flex; align-items: center; gap: 16px; }
.brand { font-weight: 700; letter-spacing: -.01em; text-decoration: none; color: var(--ink); display: flex; align-items: center; gap: 10px; white-space: nowrap; }
.brand-mark { width: 28px; height: 28px; border-radius: 6px; background: var(--accent); display: grid; place-items: center; color: #fff; font: 600 13px "IBM Plex Mono", monospace; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 8px; padding: 2px; background: var(--paper); }
.seg button { border: 0; background: none; color: var(--muted); font: 500 13px "IBM Plex Sans", sans-serif; padding: 5px 10px; border-radius: 6px; cursor: pointer; white-space: nowrap; }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.progress { margin-left: auto; display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--muted); }
.progress-bar { width: 120px; height: 6px; background: var(--line); border-radius: 99px; overflow: hidden; }
.progress-bar span { display: block; height: 100%; width: 0; background: var(--ok); transition: width .3s; }
.icon-btn { border: 1px solid var(--line); background: var(--paper); color: var(--ink); border-radius: 6px; height: 32px; padding: 0 10px; cursor: pointer; font: inherit; font-size: 13px; }

/* ---------- layout ---------- */
.layout { max-width: 1180px; margin: 0 auto; padding: 0 16px; display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 48px; }
nav.toc { position: sticky; top: 72px; align-self: start; padding: 32px 0; max-height: calc(100vh - 72px); overflow: auto; }
nav.toc ol { list-style: none; margin: 0; padding: 0; counter-reset: toc; }
nav.toc li { counter-increment: toc; }
nav.toc a { display: flex; gap: 10px; padding: 6px 10px; border-radius: 6px; color: var(--muted); text-decoration: none; font-size: 14px; }
nav.toc a::before { content: counter(toc, decimal-leading-zero); font: 12px "IBM Plex Mono", monospace; opacity: .7; padding-top: 2px; }
nav.toc a:hover { background: var(--paper); color: var(--ink); }
nav.toc a.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
main { padding: 32px 0 96px; min-width: 0; }

/* ---------- capa ---------- */
.hero { padding: 24px 0 40px; border-bottom: 1px solid var(--line); margin-bottom: 40px; }
.eyebrow { font: 600 12px "IBM Plex Mono", monospace; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
h1 { font-size: clamp(32px, 5vw, 48px); line-height: 1.08; letter-spacing: -.025em; margin: 10px 0 16px; }
.lead { font-size: 18px; color: var(--muted); max-width: 62ch; margin: 0; }

.versions { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; margin-top: 28px; }
.version {
  text-align: left; font: inherit; color: inherit; cursor: pointer; background: var(--paper);
  border: 2px solid var(--line); border-radius: 12px; padding: 18px 20px; box-shadow: var(--shadow); transition: border-color .2s;
}
.version:hover { border-color: var(--muted); }
.version[aria-pressed="true"] { border-color: var(--accent); }
.version[data-v="eco"][aria-pressed="true"] { border-color: var(--eco); }
.version .tag { font: 600 11px "IBM Plex Mono", monospace; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.version[data-v="eco"] .tag { color: var(--eco); }
.version h3 { margin: 4px 0 2px; font-size: 20px; }
.version .price { font: 600 26px "IBM Plex Sans", sans-serif; letter-spacing: -.02em; }
.version .price small { font-size: 13px; font-weight: 400; color: var(--muted); letter-spacing: 0; }
.version p { margin: 8px 0 0; font-size: 14px; color: var(--muted); }
.version .pick { margin-top: 12px; font-size: 13px; font-weight: 600; color: var(--muted); }
.version[aria-pressed="true"] .pick { color: var(--ink); }

/* ---------- seções ---------- */
section { margin-bottom: 64px; }
h2 { font-size: 28px; letter-spacing: -.02em; margin: 0 0 8px; display: flex; align-items: baseline; gap: 12px; }
h2 .num { font: 600 14px "IBM Plex Mono", monospace; color: var(--accent); }
h3 { font-size: 18px; margin: 32px 0 8px; }
.section-intro { color: var(--muted); margin: 0 0 24px; max-width: 70ch; }
p { max-width: 72ch; }

.badge { display: inline-block; font: 600 11px "IBM Plex Mono", monospace; letter-spacing: .04em; text-transform: uppercase; padding: 2px 8px; border-radius: 99px; vertical-align: middle; }
.badge.eco { background: var(--eco-soft); color: var(--eco); }
.badge.full { background: var(--accent-soft); color: var(--accent); }

/* tabelas */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 10px; background: var(--paper); box-shadow: var(--shadow); }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: 12px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); font-weight: 600; background: color-mix(in srgb, var(--paper) 60%, var(--bg)); }
tr:last-child td { border-bottom: 0; }
td.qty, td.money { font-family: "IBM Plex Mono", monospace; white-space: nowrap; }
td.money { text-align: right; }
tr.total td { font-weight: 700; background: color-mix(in srgb, var(--paper) 60%, var(--bg)); }
.pin { font-family: "IBM Plex Mono", monospace; font-weight: 600; white-space: nowrap; }

/* avisos */
.callout { border-radius: 10px; padding: 14px 16px 14px 48px; margin: 20px 0; position: relative; max-width: 78ch; }
.callout::before { position: absolute; left: 16px; top: 13px; font: 700 15px "IBM Plex Mono", monospace; }
.callout p { margin: 0; }
.callout p + p { margin-top: 6px; }
.callout.info { background: var(--accent-soft); } .callout.info::before { content: "i"; color: var(--accent); left: 21px; }
.callout.warn { background: var(--warn-soft); } .callout.warn::before { content: "!"; color: var(--warn); left: 21px; }
.callout.danger { background: var(--danger-soft); } .callout.danger::before { content: "⚡"; color: var(--danger); }
.callout.ok { background: var(--ok-soft); } .callout.ok::before { content: "✓"; color: var(--ok); }

/* passos */
.steps { list-style: none; padding: 0; margin: 0; counter-reset: step; display: grid; gap: 12px; }
.step {
  counter-increment: step; background: var(--paper); border: 1px solid var(--line); border-radius: 10px;
  padding: 16px 18px 16px 64px; position: relative; box-shadow: var(--shadow); transition: border-color .2s;
}
.step::before {
  content: counter(step); position: absolute; left: 18px; top: 16px; width: 30px; height: 30px; border-radius: 50%;
  background: var(--ink); color: var(--paper); display: grid; place-items: center; font: 600 13px "IBM Plex Mono", monospace;
}
.step h4 { margin: 2px 0 4px; font-size: 16px; padding-right: 40px; }
.step p, .step ul { margin: 6px 0 0; color: var(--muted); font-size: 15px; }
.step ul { padding-left: 18px; }
.step pre { margin: 10px 0 0; }
.step .check { position: absolute; right: 16px; top: 16px; width: 22px; height: 22px; accent-color: var(--ok); cursor: pointer; }
.step.done { border-color: var(--ok); }
.step.done::before { background: var(--ok); content: "✓"; }
.step.done h4 { text-decoration: line-through; text-decoration-color: var(--ok); }

/* figuras */
figure { margin: 24px 0; background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 20px; box-shadow: var(--shadow); }
figure svg { width: 100%; height: auto; display: block; }
figcaption { font-size: 13px; color: var(--muted); margin-top: 12px; }
.legend { display: flex; flex-wrap: wrap; gap: 8px 18px; font-size: 13px; margin-top: 12px; color: var(--muted); }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend i { width: 18px; height: 3px; border-radius: 2px; display: inline-block; }

.svg-text { fill: var(--ink); font: 13px "IBM Plex Sans", sans-serif; }
.svg-small { fill: var(--muted); font: 11px "IBM Plex Mono", monospace; }
.svg-box { fill: var(--paper); stroke: var(--ink); stroke-width: 1.5; }
.svg-box-accent { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 1.5; }
.svg-dim { stroke: var(--muted); stroke-width: 1; fill: none; }
.svg-wire { stroke: var(--ink); stroke-width: 1.5; fill: none; }
.svg-rail-5v { stroke: var(--wire-power); stroke-width: 2.5; fill: none; }
.svg-rail-3v3 { stroke: var(--wire-3v3); stroke-width: 2.5; fill: none; }
.svg-gnd { stroke: var(--muted); stroke-width: 2.5; fill: none; }
.svg-sig { stroke: var(--wire-sig); stroke-width: 2; fill: none; }

.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; }
.card { background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px; box-shadow: var(--shadow); }
.card h4 { margin: 0 0 6px; font-size: 15px; }
.card p, .card ul { margin: 0; font-size: 14px; color: var(--muted); }
.card ul { padding-left: 18px; }

pre { background: var(--code-bg); border-radius: 10px; padding: 14px 16px; overflow-x: auto; font: 13px/1.55 "IBM Plex Mono", monospace; margin: 16px 0; }
pre code { background: none; padding: 0; }

footer { border-top: 1px solid var(--line); padding: 24px 0; color: var(--muted); font-size: 13px; }

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; gap: 0; }
  nav.toc { display: none; }
  .progress-bar { width: 70px; }
}
@media (max-width: 620px) {
  .progress-label, .brand-name, #print-btn { display: none; }
  .step { padding-left: 56px; }
  .step::before { left: 14px; }
}
@media print {
  .topbar, nav.toc, .check, .icon-btn, .versions { display: none !important; }
  .layout { display: block; }
  body { background: #fff; }
  .step, figure, .card { box-shadow: none; break-inside: avoid; }
}

/* ---------- compartilhado com o plano de aulas ---------- */
.nav-link { display: inline-flex; align-items: center; text-decoration: none; white-space: nowrap; }
.lead-note { margin: 12px 0 0; font-size: 15px; color: var(--muted); }
@media (max-width: 620px) { .nav-link { display: none; } }
.specs { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; margin-top: 28px; }
.specs div { background: var(--paper); padding: 14px 16px; }
.specs dt { font-size: 12px; color: var(--muted); }
.specs dd { margin: 2px 0 0; font-weight: 600; }
/* passos em grade: sem isto, um bloco de código comprido alarga a coluna além da tela */
.steps { grid-template-columns: minmax(0, 1fr); }
.step { min-width: 0; overflow-wrap: anywhere; }
.step pre { overflow-wrap: normal; }