/* ============ TOKENS — Bitcoin Guide ============ */
  :root, :root[data-theme="dark"], :root[data-theme="light"] {
    --bg: #0e0b07;
    --surface: #171208;
    --surface-2: #1f180c;
    --line: #33281a;
    --line-strong: #4a3a22;
    --text: #ede3d3;
    --text-muted: #a89678;
    --text-faint: #7a6c55;
    --btc: #f7931a;
    --btc-soft: rgba(247, 147, 26, .12);
    --pill: #d6362b;
    --pill-soft: rgba(214, 54, 43, .12);
    --ok: #6fbf73;
    --mono: ui-monospace, "Cascadia Code", Consolas, "SF Mono", Menlo, monospace;
    --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    color-scheme: dark;
  }
  html { background: var(--bg); scroll-behavior: smooth; }
  @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
  body { background: var(--bg); color: var(--text); font-family: var(--sans); line-height: 1.65; font-size: 16.5px; }
  .wrap { max-width: 940px; margin: 0 auto; padding: 0 24px; }

  h1, h2, h3, h4 { text-wrap: balance; line-height: 1.12; margin: 0; }
  h1 { font-size: clamp(2.5rem, 7vw, 4rem); font-weight: 800; letter-spacing: -.02em; }
  h2 { font-size: clamp(1.6rem, 4vw, 2.1rem); font-weight: 750; letter-spacing: -.01em; }
  h3 { font-size: 1.15rem; font-weight: 700; }
  p { margin: 0 0 1em; max-width: 70ch; }
  ul, ol { margin: 0 0 1.2em; padding-left: 1.4em; max-width: 70ch; }
  li { margin-bottom: .5em; }
  li::marker { color: var(--btc); }
  a { color: var(--btc); text-decoration: none; }
  a:hover, a:focus-visible { text-decoration: underline; }
  strong { color: #fff; font-weight: 650; }
  .eyebrow { font-family: var(--mono); font-size: .72rem; letter-spacing: .18em; text-transform: uppercase; color: var(--btc); margin-bottom: 14px; }
  .muted { color: var(--text-muted); }
  .small { font-size: .875rem; }

  /* ============ NAV ============ */
  nav.top {
    position: sticky; top: 0; z-index: 50;
    background: rgba(14, 11, 7, .92); backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--line);
  }
  nav.top .bar { display: flex; align-items: center; gap: 22px; padding: 14px 24px; max-width: 940px; margin: 0 auto; flex-wrap: wrap; }
  nav.top .logo { font-weight: 800; color: #fff; font-size: 1.05rem; white-space: nowrap; }
  nav.top .logo b { color: var(--btc); }
  nav.top .links { display: flex; gap: 18px; flex-wrap: wrap; font-size: .85rem; }
  nav.top .links a { color: var(--text-muted); }
  nav.top .links a:hover { color: var(--btc); text-decoration: none; }
  .btn {
    display: inline-block; font-weight: 700; border-radius: 5px; padding: 12px 22px;
    background: var(--btc); color: #14100a !important; border: 1px solid var(--btc);
    text-decoration: none !important; font-size: .95rem;
  }
  .btn { transition: transform .12s ease, filter .12s ease, box-shadow .12s ease; cursor: pointer; }
  .btn:hover { filter: brightness(1.12); transform: translateY(-1px); box-shadow: 0 4px 18px rgba(247,147,26,.25); }
  .btn:active { transform: translateY(1px) scale(.98); box-shadow: none; }
  .btn:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }
  .btn.ghost { background: transparent; color: var(--btc) !important; }
  .btn.ghost:hover { background: var(--btc-soft); }
  .btn.sm { padding: 8px 16px; font-size: .82rem; }
  .langs { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
  .langs button {
    font-family: var(--mono); font-size: .72rem; padding: 5px 9px; cursor: pointer;
    background: transparent; border: 1px solid var(--line-strong); border-radius: 4px;
    color: var(--text-muted);
  }
  .langs button:hover { border-color: var(--btc); color: var(--btc); }
  .langs button.ativo { background: var(--btc); border-color: var(--btc); color: #14100a; font-weight: 700; }
  @media (prefers-reduced-motion: reduce) { .btn, .card, .quiz-opt { transition: none !important; transform: none !important; } }

  /* ============ HERO ============ */
  header.hero { padding: 88px 0 72px; border-bottom: 1px solid var(--line); position: relative; overflow: hidden; }
  header.hero::before {
    content: "₿"; position: absolute; right: -20px; top: 20px;
    font-size: 22rem; font-weight: 800; line-height: 1;
    color: var(--btc); opacity: .05; pointer-events: none;
  }
  .hero-sub { font-size: 1.3rem; color: var(--text-muted); margin: 20px 0 8px; max-width: 54ch; }
  .hero-sub b { color: var(--btc); font-weight: 650; }
  .cta-row { display: flex; gap: 14px; margin-top: 30px; flex-wrap: wrap; align-items: center; }
  .badges { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 34px; }
  .chip {
    font-family: var(--mono); font-size: .72rem; letter-spacing: .06em;
    padding: 5px 12px; border-radius: 3px; border: 1px solid var(--line-strong); color: var(--text-muted);
  }
  .chip.hot { border-color: var(--btc); color: var(--btc); background: var(--btc-soft); }

  /* ============ SEÇÕES ============ */
  section { padding: 72px 0; border-bottom: 1px solid var(--line); }
  .sec-head { display: flex; align-items: baseline; gap: 16px; border-bottom: 2px solid var(--btc); padding-bottom: 12px; margin-bottom: 34px; }
  .sec-num { font-family: var(--mono); font-size: .85rem; color: var(--btc); letter-spacing: .1em; white-space: nowrap; }
  section h3 { margin: 34px 0 14px; color: var(--btc); }

  .cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 14px; margin: 0 0 1.4em; }
  .card { border: 1px solid var(--line); border-radius: 6px; padding: 20px 22px; background: var(--surface); transition: transform .15s ease, border-color .15s ease; }
  .card:hover { transform: translateY(-3px); border-color: var(--line-strong); }
  .card.featured:hover { border-color: var(--btc); }
  .card h4 { margin: 0 0 8px; font-size: 1rem; }
  .card .tag { font-family: var(--mono); font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; color: var(--btc); display: block; margin-bottom: 8px; }
  .card p { font-size: .9rem; color: var(--text-muted); margin: 0; }
  .card p:not(:last-child) { margin-bottom: .7em; }
  .card.featured { border-color: var(--btc); background: linear-gradient(160deg, var(--surface-2), var(--surface)); }

  .table-scroll { overflow-x: auto; margin: 0 0 1.4em; }
  table { border-collapse: collapse; width: 100%; font-size: .9rem; min-width: 560px; }
  th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
  th { font-family: var(--mono); font-size: .7rem; letter-spacing: .12em; text-transform: uppercase; color: var(--text-muted); border-bottom: 1px solid var(--line-strong); }
  td:first-child { color: #fff; font-weight: 600; white-space: nowrap; }

  .callout { border-left: 3px solid var(--btc); background: var(--btc-soft); padding: 16px 20px; border-radius: 0 6px 6px 0; margin: 0 0 1.4em; }
  .callout.red { border-left-color: var(--pill); background: var(--pill-soft); }
  .callout p:last-child { margin-bottom: 0; }
  .callout .label { font-family: var(--mono); font-size: .68rem; letter-spacing: .15em; text-transform: uppercase; color: var(--btc); display: block; margin-bottom: 6px; }
  .callout.red .label { color: #ff7a6e; }

  blockquote {
    margin: 0; padding: 20px 26px; border-left: 3px solid var(--pill);
    background: var(--surface); border-radius: 0 6px 6px 0; font-style: italic;
    color: var(--text); font-size: 1.05rem; max-width: 70ch;
  }
  blockquote cite { display: block; margin-top: 10px; font-style: normal; font-family: var(--mono); font-size: .74rem; color: var(--text-faint); }
  .quotes { display: grid; gap: 14px; margin-bottom: 1.4em; }

  .toc-book { background: #0a0805; border: 1px solid var(--line); border-radius: 6px; padding: 20px 24px; font-family: var(--mono); font-size: .84rem; line-height: 1.9; color: #d8cbb4; overflow-x: auto; margin: 0 0 1.4em; }
  .toc-book b { color: var(--btc); font-weight: 600; }

  .lesson { border: 1px solid var(--line-strong); border-radius: 8px; background: var(--surface); margin-bottom: 26px; overflow: hidden; }
  .lesson-head { padding: 16px 24px; background: var(--surface-2); border-bottom: 1px solid var(--line); display: flex; flex-wrap: wrap; align-items: baseline; gap: 12px; }
  .lesson-head .lvl { font-family: var(--mono); font-size: .68rem; letter-spacing: .15em; text-transform: uppercase; padding: 3px 10px; border-radius: 3px; }
  .lvl.b1 { background: var(--btc-soft); color: var(--btc); border: 1px solid var(--btc); }
  .lvl.b2 { background: rgba(232,176,76,.1); color: #e8b04c; border: 1px solid #8a6a2e; }
  .lvl.b3 { background: var(--pill-soft); color: #ff7a6e; border: 1px solid var(--pill); }
  .lesson-body { padding: 24px; }
  .lesson-body h4 { color: var(--btc); margin: 22px 0 10px; font-size: 1rem; }
  .lesson-body h4:first-child { margin-top: 0; }
  .quiz { border-top: 1px dashed var(--line-strong); margin-top: 20px; padding-top: 18px; }
  .quiz .q { font-weight: 650; color: #fff; margin-bottom: .7em; }
  .quiz-opts { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 4px; }
  .quiz-opt {
    font-family: inherit; font-size: .9rem; color: var(--text);
    background: var(--surface-2); border: 1px solid var(--line-strong);
    border-radius: 5px; padding: 10px 16px; cursor: pointer; text-align: left;
    transition: transform .12s ease, border-color .12s ease, background .12s ease;
  }
  .quiz-opt:hover { border-color: var(--btc); transform: translateY(-1px); }
  .quiz-opt:active { transform: scale(.97); }
  .quiz-opt:focus-visible { outline: 2px solid var(--btc); outline-offset: 2px; }
  .quiz-opt.certa { border-color: var(--ok); background: rgba(111,191,115,.14); color: #cfe9d1; }
  .quiz-opt.errada { border-color: var(--pill); background: var(--pill-soft); color: #ffb3ab; }
  .quiz-opt:disabled { cursor: default; opacity: .85; }
  .quiz-fb { font-family: var(--mono); font-size: .8rem; margin: 10px 0 0; min-height: 1.4em; }
  .quiz-fb.ok { color: var(--ok); }
  .quiz-fb.erro { color: #ff7a6e; }

  /* FAQ acordeão */
  details.faq { border: 1px solid var(--line); border-radius: 6px; margin-bottom: 12px; background: var(--surface); overflow: hidden; }
  details.faq summary {
    cursor: pointer; padding: 16px 20px; font-weight: 650; color: #fff;
    list-style: none; display: flex; align-items: baseline; gap: 12px;
  }
  details.faq summary::-webkit-details-marker { display: none; }
  details.faq summary::before { content: "+"; font-family: var(--mono); color: var(--btc); font-size: 1.1rem; width: 16px; flex-shrink: 0; }
  details.faq[open] summary::before { content: "–"; }
  details.faq summary:hover { background: var(--surface-2); }
  details.faq summary:focus-visible { outline: 2px solid var(--btc); outline-offset: -2px; }
  details.faq .resp { padding: 2px 22px 18px 48px; border-top: 1px solid var(--line); }
  details.faq .resp p { margin: 12px 0 0; color: var(--text-muted); }
  details.faq .resp p strong { color: var(--text); }

  /* Notícias */
  .news { border: 1px solid var(--line); border-radius: 6px; background: var(--surface); margin-bottom: 16px; padding: 20px 24px; }
  .news .nh { display: flex; flex-wrap: wrap; align-items: baseline; gap: 12px; margin-bottom: 8px; }
  .news .data { font-family: var(--mono); font-size: .72rem; color: var(--btc); letter-spacing: .08em; }
  .news h4 { margin: 0; font-size: 1.05rem; }
  .news p { margin: 0 0 .6em; color: var(--text-muted); font-size: .93rem; }
  .news .rp { border-left: 3px solid var(--pill); padding: 8px 14px; background: var(--pill-soft); border-radius: 0 4px 4px 0; font-size: .88rem; color: var(--text); }
  .news .rp b { color: #ff7a6e; font-family: var(--mono); font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; display: block; margin-bottom: 3px; }
  .news .fonte { font-family: var(--mono); font-size: .74rem; }
  /* Ferramentas: conversor e calculadora */
  .tools-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; margin-bottom: 1.2em; }
  .tool-card { border: 1px solid var(--line-strong); border-radius: 8px; background: var(--surface); padding: 22px 24px; }
  .tool-card h3 { margin: 0 0 16px; font-size: 1.05rem; color: #fff; }
  .tool-row { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
  .tool-row input[type="number"], .tool-row input[type="date"] {
    flex: 1; min-width: 110px; background: #0a0805; border: 1px solid var(--line-strong); border-radius: 5px;
    padding: 10px 14px; color: var(--text); font-family: var(--mono); font-size: .95rem;
  }
  .tool-row select {
    background: #0a0805; border: 1px solid var(--line-strong); border-radius: 5px;
    padding: 10px 14px; color: var(--text); font-family: inherit; font-size: .9rem; cursor: pointer;
  }
  .tool-row input:focus-visible, .tool-row select:focus-visible { outline: 2px solid var(--btc); outline-offset: -1px; }
  .tool-label { display: flex; flex-direction: column; gap: 6px; font-size: .78rem; color: var(--text-muted); flex: 1; min-width: 160px; }
  .tool-results { display: flex; flex-direction: column; gap: 2px; border-top: 1px solid var(--line); padding-top: 12px; }
  .tr-row { display: flex; justify-content: space-between; gap: 12px; padding: 7px 0; font-size: .92rem; }
  .tr-row span { color: var(--text-muted); }
  .tr-row b { font-family: var(--mono); color: var(--btc); font-variant-numeric: tabular-nums; text-align: right; }
  .tool-status { margin: 10px 0 0; }
  .tool-status.erro { color: #ff7a6e; }

  .price-strip { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 24px; }
  .price-strip .pchip {
    font-family: var(--mono); font-size: .8rem; padding: 10px 16px; border-radius: 5px;
    border: 1px solid var(--line-strong); background: var(--surface-2); color: var(--text);
  }
  .price-strip .pchip b { color: var(--btc); }

  /* Gráfico ao vivo */
  .chart-wrap { border: 1px solid var(--line-strong); border-radius: 8px; overflow: hidden; background: #0a0805; height: 440px; margin: 0 0 16px; position: relative; }
  .chart-wrap .tv-fallback { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; text-align: center; padding: 24px; color: var(--text-muted); background: #0a0805; }
  .chart-wrap .tv-fallback .big { font-family: var(--mono); font-size: 2rem; color: var(--btc); font-weight: 700; }
  .chart-wrap canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: none; }
  .chart-titulo { position: absolute; top: 12px; left: 16px; z-index: 2; font-family: var(--mono); font-size: .72rem; letter-spacing: .1em; color: var(--text-muted); display: none; }
  .live-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--text-faint); margin-right: 6px; vertical-align: 1px; }
  .live-dot.on { background: var(--ok); box-shadow: 0 0 6px var(--ok); }

  /* Chat Pergunte ao Guia */
  .chat-box { border: 1px solid var(--line-strong); border-radius: 8px; background: var(--surface); overflow: hidden; margin: 26px 0 1.4em; }
  .chat-head { padding: 14px 20px; background: var(--surface-2); border-bottom: 1px solid var(--line); display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
  .chat-head h3 { margin: 0; color: #fff; font-size: 1.05rem; }
  .chat-head .modo { font-family: var(--mono); font-size: .68rem; letter-spacing: .1em; text-transform: uppercase; padding: 3px 10px; border-radius: 3px; border: 1px solid var(--line-strong); color: var(--text-muted); margin-left: auto; }
  .chat-msgs { padding: 18px 20px; display: flex; flex-direction: column; gap: 12px; min-height: 120px; max-height: 420px; overflow-y: auto; }
  .msg { max-width: 85%; padding: 12px 16px; border-radius: 8px; font-size: .93rem; line-height: 1.55; }
  .msg.user { align-self: flex-end; background: var(--btc-soft); border: 1px solid var(--btc); color: var(--text); }
  .msg.bot { align-self: flex-start; background: var(--surface-2); border: 1px solid var(--line); color: var(--text); }
  .msg.bot b { color: var(--btc); }
  .msg.pensando { color: var(--text-muted); font-style: italic; }
  .chat-input { display: flex; gap: 10px; padding: 14px 20px; border-top: 1px solid var(--line); }
  .chat-input input {
    flex: 1; background: #0a0805; border: 1px solid var(--line-strong); border-radius: 5px;
    padding: 12px 16px; color: var(--text); font-family: inherit; font-size: .95rem;
  }
  .chat-input input:focus-visible { outline: 2px solid var(--btc); outline-offset: -1px; }
  .chat-sug { display: flex; flex-wrap: wrap; gap: 8px; padding: 0 20px 16px; }
  .chat-sug button {
    font-family: inherit; font-size: .8rem; color: var(--text-muted); background: transparent;
    border: 1px solid var(--line-strong); border-radius: 20px; padding: 6px 14px; cursor: pointer;
  }
  .chat-sug button:hover { border-color: var(--btc); color: var(--btc); }
  .chat-cfg { border-top: 1px dashed var(--line-strong); padding: 12px 20px 16px; }
  .chat-cfg summary { cursor: pointer; font-family: var(--mono); font-size: .74rem; color: var(--text-faint); letter-spacing: .08em; }
  .chat-cfg summary:hover { color: var(--btc); }
  .chat-cfg .row { display: flex; gap: 10px; margin-top: 12px; flex-wrap: wrap; }
  .chat-cfg input { flex: 1; min-width: 220px; background: #0a0805; border: 1px solid var(--line-strong); border-radius: 5px; padding: 9px 14px; color: var(--text); font-family: var(--mono); font-size: .8rem; }
  .chat-cfg .status { font-family: var(--mono); font-size: .72rem; margin-top: 8px; color: var(--text-faint); }

  .buy-band {
    border: 1px solid var(--btc); border-radius: 8px; background: linear-gradient(160deg, var(--surface-2), var(--surface));
    padding: 30px 32px; margin: 8px 0 1.4em; display: flex; flex-wrap: wrap; gap: 20px; align-items: center; justify-content: space-between;
  }
  .buy-band .txt { max-width: 52ch; }
  .buy-band h3 { color: #fff; margin: 0 0 6px; }
  .buy-band p { margin: 0; color: var(--text-muted); font-size: .92rem; }

  footer.doc { padding: 48px 0 72px; color: var(--text-faint); font-size: .84rem; }
  footer.doc p { max-width: none; }
  footer.doc a { color: var(--text-muted); }

  /* ============ PAGE HEAD (páginas internas) ============ */
  .breadcrumb { font-family: var(--mono); font-size: .74rem; color: var(--text-faint); padding: 18px 0 0; }
  .breadcrumb a { color: var(--text-muted); }
  .page-head { padding: 18px 0 46px; border-bottom: 1px solid var(--line); }
  .page-head h1 { font-size: clamp(1.9rem, 4.5vw, 2.7rem); font-weight: 800; letter-spacing: -.01em; margin: 10px 0 12px; }
  .page-head .lead { font-size: 1.1rem; color: var(--text-muted); max-width: 62ch; margin: 0; }

  /* ============ HOME: cartões de navegação ============ */
  .explore-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; margin: 0 0 1.4em; }
  .explore-card {
    display: block; border: 1px solid var(--line); border-radius: 8px; padding: 22px 24px;
    background: var(--surface); transition: transform .15s ease, border-color .15s ease;
  }
  .explore-card:hover { transform: translateY(-3px); border-color: var(--btc); text-decoration: none; }
  .explore-card .n { font-family: var(--mono); font-size: .72rem; color: var(--btc); letter-spacing: .12em; display: block; margin-bottom: 8px; }
  .explore-card h3 { color: #fff; margin: 0 0 6px; font-size: 1.05rem; }
  .explore-card p { color: var(--text-muted); font-size: .88rem; margin: 0; max-width: none; }

  /* ============ BLOG ============ */
  .blog-list { display: flex; flex-direction: column; gap: 14px; margin: 0 0 1.4em; }
  .blog-card { display: block; border: 1px solid var(--line); border-radius: 8px; padding: 24px 26px; background: var(--surface); transition: transform .15s ease, border-color .15s ease; }
  .blog-card:hover { transform: translateY(-2px); border-color: var(--btc); text-decoration: none; }
  .blog-card .data { font-family: var(--mono); font-size: .7rem; color: var(--btc); letter-spacing: .1em; display: block; margin-bottom: 8px; }
  .blog-card h2 { color: #fff; font-size: 1.25rem; margin: 0 0 8px; }
  .blog-card p { color: var(--text-muted); margin: 0; }
  article.post h2 { color: var(--btc); margin: 34px 0 12px; }
  article.post .post-meta { font-family: var(--mono); font-size: .78rem; color: var(--text-faint); margin-bottom: 6px; }
  .post-cta { margin-top: 8px; }