/* =========================================================================
   Programação Windows — folha de estilo
   Identidade: livro técnico. Corpo em serifa (leitura), títulos em grotesk,
   código em mono. Azul "Win" sóbrio como acento. Papel quente no claro,
   editor de código no escuro.
   ========================================================================= */

:root {
  /* Paleta — modo claro */
  --paper:        #fcfbf8;
  --paper-2:      #f4f1ea;
  --ink:          #16233a;
  --ink-soft:     #3a4759;
  --ink-faint:    #6b7686;
  --rule:         #e4ddd0;
  --rule-soft:    #efe9dd;
  --accent:       #2f5fe0;
  --accent-deep:  #1b3a8f;
  --accent-wash:  #eaf0ff;
  --code-bg:      #f3f0e9;
  --code-ink:     #1d2a44;
  --selection:    #cfe0ff;

  /* Tipografia */
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body:    'Newsreader', Georgia, 'Times New Roman', serif;
  --font-mono:    'JetBrains Mono', ui-monospace, 'SFMono-Regular', monospace;

  /* Métricas */
  --sidebar-w:    310px;
  --reading-w:    44rem;
  --radius:       10px;
  --shadow:       0 1px 2px rgba(22,35,58,.05), 0 8px 30px rgba(22,35,58,.06);
}

html.dark {
  --paper:        #0e1525;
  --paper-2:      #141d31;
  --ink:          #e8edf6;
  --ink-soft:     #b3bdce;
  --ink-faint:    #7c879a;
  --rule:         #22304a;
  --rule-soft:    #1a2438;
  --accent:       #6f9bff;
  --accent-deep:  #9bb8ff;
  --accent-wash:  #182746;
  --code-bg:      #0a0f1c;
  --code-ink:     #d6def0;
  --selection:    #243a66;
  --shadow:       0 1px 2px rgba(0,0,0,.3), 0 10px 34px rgba(0,0,0,.4);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.18rem;
  line-height: 1.78;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--selection); }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

/* ======================= Layout em grade ============================= */
.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  min-height: 100vh;
}

/* ============================ Cabeçalho ============================== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 1rem;
  height: 64px;
  padding: 0 1.25rem;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--rule);
}

.topbar__brand {
  display: flex;
  align-items: center;
  gap: .7rem;
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--ink);
  white-space: nowrap;
}
.topbar__mark {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  width: 22px; height: 22px;
  flex: none;
}
.topbar__mark span { background: var(--accent); border-radius: 2px; }
.topbar__mark span:nth-child(2){ background: var(--accent-deep); }
.topbar__mark span:nth-child(3){ background: var(--accent-deep); }
.topbar__mark span:nth-child(4){ background: var(--accent); }

.topbar__title small {
  display: block;
  font-family: var(--font-body);
  font-style: italic;
  font-weight: 400;
  font-size: .8rem;
  color: var(--ink-faint);
  letter-spacing: 0;
}

.topbar__spacer { flex: 1; }

.iconbtn {
  display: inline-grid;
  place-items: center;
  width: 40px; height: 40px;
  border: 1px solid var(--rule);
  border-radius: 9px;
  background: var(--paper-2);
  color: var(--ink-soft);
  cursor: pointer;
  transition: border-color .15s, color .15s, background .15s;
}
.iconbtn:hover { color: var(--accent); border-color: var(--accent); }
.iconbtn svg { width: 18px; height: 18px; }

#menuToggle { display: none; }

/* ============================ Barra lateral ========================= */
.sidebar {
  position: sticky;
  top: 64px;
  align-self: start;
  height: calc(100vh - 64px);
  overflow-y: auto;
  padding: 1.5rem 1rem 4rem;
  border-right: 1px solid var(--rule);
  background: var(--paper);
  scrollbar-width: thin;
}

.search {
  position: relative;
  margin-bottom: 1.4rem;
}
.search input {
  width: 100%;
  padding: .6rem .7rem .6rem 2.2rem;
  font-family: var(--font-display);
  font-size: .9rem;
  color: var(--ink);
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 9px;
  outline: none;
}
.search input:focus { border-color: var(--accent); }
.search svg {
  position: absolute; left: .65rem; top: 50%; transform: translateY(-50%);
  width: 16px; height: 16px; color: var(--ink-faint);
}

.toc__part {
  font-family: var(--font-display);
  font-size: .72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--ink-faint);
  margin: 1.6rem 0 .5rem;
  padding-left: .25rem;
}
.toc__part:first-child { margin-top: 0; }

.toc__chapter { margin-bottom: .15rem; }

.toc__chaptbtn {
  display: flex;
  align-items: center;
  gap: .55rem;
  width: 100%;
  padding: .5rem .55rem;
  border: none;
  background: none;
  text-align: left;
  font-family: var(--font-display);
  font-size: .92rem;
  font-weight: 500;
  color: var(--ink);
  cursor: pointer;
  border-radius: 8px;
}
.toc__chaptbtn:hover, .toc__chaptbtn:hover { background: var(--paper-2); }
.toc__chaptbtn:hover { background: var(--paper-2); }
.toc__num {
  flex: none;
  font-size: .72rem;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  font-weight: 600;
  min-width: 1.4rem;
}
.toc__chevron {
  margin-left: auto; flex: none;
  width: 14px; height: 14px;
  color: var(--ink-faint);
  transition: transform .2s;
}
.toc__chapter[open] .toc__chevron { transform: rotate(90deg); }

.toc__pages { list-style: none; margin: .1rem 0 .4rem; padding: 0 0 0 1.85rem; }
.toc__pages li { margin: 1px 0; }
.toc__page {
  display: block;
  padding: .34rem .55rem;
  font-family: var(--font-display);
  font-size: .86rem;
  font-weight: 400;
  color: var(--ink-soft);
  border-radius: 7px;
  border-left: 2px solid transparent;
  cursor: pointer;
  transition: color .12s, background .12s;
}
.toc__page:hover { color: var(--ink); background: var(--paper-2); text-decoration: none; }
.toc__page.active {
  color: var(--accent);
  background: var(--accent-wash);
  border-left-color: var(--accent);
  font-weight: 500;
}

/* ============================ Conteúdo ============================== */
.main { min-width: 0; }

.reader {
  max-width: var(--reading-w);
  margin: 0 auto;
  padding: 3.5rem 1.6rem 6rem;
}

.crumbs {
  font-family: var(--font-display);
  font-size: .78rem;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 1.4rem;
}
.crumbs span { color: var(--accent); }

/* Tipografia do texto do livro */
.content h1 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: -.02em;
  margin: 0 0 1.6rem;
  color: var(--ink);
}
.content h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: -.01em;
  margin: 3rem 0 1rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--rule-soft);
  color: var(--ink);
}
.content h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 2.2rem 0 .8rem;
  color: var(--ink);
}
.content h4 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  margin: 1.8rem 0 .6rem;
  color: var(--ink-soft);
}
.content p { margin: 1.1rem 0; }
.content strong { font-weight: 600; color: var(--ink); }
.content em { color: var(--ink); }

.content ul, .content ol { margin: 1.1rem 0; padding-left: 1.5rem; }
.content li { margin: .4rem 0; }
.content li::marker { color: var(--accent); }

.content blockquote {
  margin: 1.6rem 0;
  padding: .2rem 1.3rem;
  border-left: 3px solid var(--accent);
  background: var(--accent-wash);
  border-radius: 0 8px 8px 0;
  color: var(--ink-soft);
  font-style: italic;
}
.content blockquote p:first-child { margin-top: .8rem; }
.content blockquote p:last-child { margin-bottom: .8rem; }

.content hr { border: none; border-top: 1px solid var(--rule); margin: 2.5rem 0; }

/* Código inline e blocos */
.content code {
  font-family: var(--font-mono);
  font-size: .86em;
  background: var(--code-bg);
  color: var(--code-ink);
  padding: .12em .4em;
  border-radius: 5px;
  border: 1px solid var(--rule-soft);
}
.content pre {
  position: relative;
  margin: 1.6rem 0;
  padding: 1.1rem 1.2rem;
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: .92rem;
  line-height: 1.65;
  box-shadow: var(--shadow);
}
.content pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
  color: var(--code-ink);
}
/* Falsa "barra de janela" no topo dos blocos de código */
.content pre::before {
  content: "";
  position: absolute;
  top: .7rem; left: 1.1rem;
  width: 8px; height: 8px; border-radius: 50%;
  background: #e0584d;
  box-shadow: 14px 0 0 #e6b13e, 28px 0 0 #4caa63;
  opacity: .55;
}
.content pre { padding-top: 2.1rem; }

/* Tabelas */
.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.6rem 0;
  font-size: .96rem;
  font-family: var(--font-display);
}
.content th, .content td {
  text-align: left;
  padding: .6rem .8rem;
  border-bottom: 1px solid var(--rule);
}
.content th {
  font-weight: 600;
  color: var(--ink);
  border-bottom: 2px solid var(--rule);
}
.content img { max-width: 100%; border-radius: var(--radius); }

/* Caixas de nota (via blockquote começando com [!NOTA] etc.) */
.callout {
  margin: 1.6rem 0;
  padding: 1rem 1.2rem;
  border-radius: var(--radius);
  border: 1px solid var(--rule);
  background: var(--paper-2);
}
.callout__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: .9rem;
  letter-spacing: .02em;
  margin-bottom: .3rem;
  display: flex; align-items: center; gap: .45rem;
}
.callout--nota   { border-left: 3px solid var(--accent); }
.callout--nota .callout__title { color: var(--accent); }
.callout--aviso  { border-left: 3px solid #d9892e; }
.callout--aviso .callout__title { color: #c9791f; }
.callout--dica   { border-left: 3px solid #3aa46a; }
.callout--dica .callout__title { color: #2f8d59; }

/* ===================== Navegação inferior =========================== */
.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--rule);
}
.pager a {
  display: flex;
  flex-direction: column;
  gap: .2rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--paper);
  transition: border-color .15s, transform .15s;
}
.pager a:hover { border-color: var(--accent); text-decoration: none; transform: translateY(-2px); }
.pager a.next { text-align: right; }
.pager__label {
  font-family: var(--font-display);
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--ink-faint);
}
.pager__title { font-family: var(--font-display); font-weight: 500; color: var(--ink); }
.pager a.placeholder { visibility: hidden; }

/* ===================== Índice "nesta página" ======================== */
.onthispage {
  position: sticky;
  top: 90px;
  align-self: start;
  width: 210px;
  padding: 0 1rem;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}
.onthispage h6 {
  font-family: var(--font-display);
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--ink-faint);
  margin: 0 0 .7rem;
}
.onthispage a {
  display: block;
  font-family: var(--font-display);
  font-size: .82rem;
  color: var(--ink-faint);
  padding: .22rem 0;
  border-left: 2px solid var(--rule);
  padding-left: .7rem;
}
.onthispage a.lvl3 { padding-left: 1.4rem; }
.onthispage a:hover, .onthispage a.active { color: var(--accent); border-left-color: var(--accent); text-decoration: none; }

.main { display: grid; grid-template-columns: minmax(0,1fr) auto; }
@media (max-width: 1180px) { .onthispage { display: none; } .main { display: block; } }

/* Estado de carregamento / erro */
.state {
  max-width: 40rem; margin: 4rem auto; padding: 2rem;
  text-align: center; color: var(--ink-soft); font-family: var(--font-display);
}
.state pre {
  text-align: left; font-size: .85rem; background: var(--code-bg);
  border: 1px solid var(--rule); border-radius: 8px; padding: 1rem; margin-top: 1rem;
}

/* Cobertura para fechar a barra lateral no mobile */
.scrim {
  display: none;
  position: fixed; inset: 64px 0 0 0; z-index: 30;
  background: rgba(10,16,30,.45);
}

/* ============================ Responsivo ============================ */
@media (max-width: 880px) {
  .app { grid-template-columns: 1fr; }
  #menuToggle { display: inline-grid; }
  .sidebar {
    position: fixed;
    top: 64px; left: 0; bottom: 0;
    width: min(86vw, 340px);
    z-index: 35;
    transform: translateX(-103%);
    transition: transform .25s ease;
    box-shadow: var(--shadow);
  }
  body.nav-open .sidebar { transform: translateX(0); }
  body.nav-open .scrim { display: block; }
  .reader { padding: 2.4rem 1.2rem 5rem; }
  .content h1 { font-size: 2rem; }
  .topbar__title small { display: none; }
}