/* =====================================================================
   ASKEMATA — folha de estilos principal
   Inspiração: documentos acadêmicos tipografados em LaTeX
   ===================================================================== */

:root {
  /* --- Cor: paleta de "papel e tinta" de um periódico acadêmico --- */
  --paper:        #FAF9F5;   /* fundo principal, papel não-couché */
  --paper-shade:  #F1EEE6;   /* cabeçalho, barra lateral, blocos */
  --ink:          #1C1A17;   /* texto principal */
  --ink-soft:     #5B564D;   /* texto secundário, legendas, metadados */
  --rule:         #D9D2C3;   /* filetes / hairlines */
  --rule-strong:  #B9AF98;   /* filetes de destaque (duplo filete do masthead) */
  --accent:       #7A2331;   /* oxblood — links, marcadores, destaque */
  --accent-soft:  #F1E1DF;   /* fundo sutil para hover / seleção */
  --navy:         #2C3A52;   /* acento secundário — visitado, ícones */

  /* --- Tipografia --- */
  --font-serif: 'Latin Modern Roman', 'CMU Serif', Georgia, 'Times New Roman', serif;
  --font-sans:  'Latin Modern Sans', 'CMU Sans Serif', Helvetica, Arial, sans-serif;
  --font-mono:  'Latin Modern Mono', 'CMU Typewriter Text', 'Courier New', monospace;

  /* --- Layout --- */
  --content-max: 42rem;      /* largura ótima de leitura, ~66-75 caracteres/linha */
  --sidebar-w: 17rem;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration-line: underline; text-decoration-thickness: from-font; text-underline-offset: 2px; }
a:hover { color: var(--navy); }
a:visited { color: var(--accent); }

a:focus-visible, button:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--navy);
  outline-offset: 2px;
}

::selection { background: var(--accent-soft); color: var(--ink); }

/* ---------------------------------------------------------------------
   Masthead — cabeçalho do periódico
   --------------------------------------------------------------------- */
.masthead {
  padding: 3.2rem 1.5rem 1.6rem;
}

.masthead__inner {
  max-width: 74rem;
  margin: 0 auto;
  text-align: center;
}

.masthead__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 2.6rem;
  letter-spacing: 0.02em;
  margin: 0;
  line-height: 1.1;
}

.masthead__title a { color: var(--ink); text-decoration: none; }

.masthead__tagline {
  font-family: var(--font-sans);
  font-size: 0.86rem;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
  margin: 0.6rem 0 0;
}

.topnav {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.topnav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.3rem 2.2rem;
  max-width: 74rem;
  margin: 0 auto;
  padding: 0.9rem 1.5rem;
  font-family: var(--font-sans);
}
.topnav a {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.2rem 0.05rem;
  border-bottom: 2px solid transparent;
}
.topnav a:hover, .topnav a[aria-current="page"] {
  border-bottom-color: var(--accent);
  color: var(--accent);
}

/* ---------------------------------------------------------------------
   Layout principal — conteúdo + barra lateral direita
   --------------------------------------------------------------------- */
.layout {
  max-width: 74rem;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--sidebar-w);
  gap: 3rem;
  align-items: start;
}

@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .sidebar { order: -1; }
}

/* ---------------------------------------------------------------------
   Artigo
   --------------------------------------------------------------------- */
.article {
  max-width: var(--content-max);
}

.article__toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.1rem;
  align-items: baseline;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  color: var(--ink-soft);
  margin-bottom: 1.6rem;
}
.article__toolbar button,
.article__toolbar a {
  font: inherit;
  color: var(--ink-soft);
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--rule-strong);
}
.article__toolbar button:hover,
.article__toolbar a:hover { color: var(--accent); text-decoration-color: var(--accent); }
.article__toolbar-pdf a { margin-left: 0.3rem; }

.article__header {
  margin-bottom: 2.4rem;
  padding-bottom: 1.6rem;
  border-bottom: 1px solid var(--rule);
}

.article__title {
  font-size: 2rem;
  line-height: 1.2;
  margin: 0 0 0.9rem;
  font-weight: 700;
}

.article__meta {
  font-family: var(--font-sans);
  font-size: 0.86rem;
  color: var(--ink-soft);
  margin: 0 0 1rem;
}
.article__meta .author { color: var(--ink); font-weight: 700; }

.article__abstract {
  font-size: 0.92rem;
  color: var(--ink-soft);
  background: var(--paper-shade);
  border-left: 3px solid var(--accent);
  padding: 0.9rem 1.1rem;
  margin: 0 0 1rem;
}
.article__abstract strong {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 0.35rem;
}

.article__keywords {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--ink-soft);
}
.article__keywords strong {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.72rem;
  color: var(--ink-soft);
}

.article__body {
  text-align: justify;
  hyphens: auto;
  -webkit-hyphens: auto;
}

.article__body > p:first-of-type::first-letter {
  font-family: var(--font-serif);
  font-weight: 700;
  float: left;
  font-size: 3.4em;
  line-height: 0.82;
  padding-right: 0.1em;
  padding-top: 0.05em;
  color: var(--accent);
}

.article__body h1, .article__body h2, .article__body h3, .article__body h4 {
  font-weight: 700;
  line-height: 1.25;
  margin: 2.2em 0 0.8em;
  text-align: left;
}
.article__body h1 { font-size: 1.5rem; }
.article__body h2 { font-size: 1.25rem; border-bottom: 1px solid var(--rule); padding-bottom: 0.3rem; }
.article__body h3 { font-size: 1.08rem; font-style: italic; }
.article__body h4 { font-size: 1rem; font-variant: small-caps; letter-spacing: 0.02em; }

.article__body p { margin: 0 0 1.1em; }

.article__body ul, .article__body ol {
  margin: 0 0 1.1em;
  padding-left: 1.6em;
  text-align: left;
}
.article__body li { margin-bottom: 0.35em; }

.article__body blockquote {
  margin: 1.6em 0;
  padding: 0.2em 0 0.2em 1.2em;
  border-left: 2px solid var(--rule-strong);
  font-style: italic;
  color: var(--ink-soft);
}

.article__body code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--paper-shade);
  padding: 0.1em 0.35em;
  border-radius: 2px;
}
.article__body pre {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--paper-shade);
  border: 1px solid var(--rule);
  padding: 1rem 1.1rem;
  overflow-x: auto;
  text-align: left;
  line-height: 1.5;
}
.article__body pre code { background: none; padding: 0; }

.article__body img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1.6rem auto;
}
.article__body figcaption {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--ink-soft);
  text-align: center;
  margin-top: 0.4rem;
}

.article__body hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 2.4em 0;
}

.article__body table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.4em 0;
  font-size: 0.92em;
}
.article__body th, .article__body td {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 0.45em 0.7em;
  text-align: left;
}
.article__body th {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.article__body sup a { text-decoration: none; }

.article__body .footnotes {
  margin-top: 2.6em;
  padding-top: 1em;
  border-top: 1px solid var(--ink);
  font-size: 0.86em;
  color: var(--ink-soft);
}

.article__footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--ink-soft);
}

/* ---------------------------------------------------------------------
   Barra lateral direita — sumário / navegação
   --------------------------------------------------------------------- */
.sidebar {
  font-family: var(--font-sans);
  font-size: 0.86rem;
  border-left: 1px solid var(--rule);
  padding-left: 1.6rem;
}

.sidebar__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--ink);
  margin-bottom: 0.9rem;
}

.sidebar__toggle {
  display: none; /* só aparece em telas pequenas, ver media query abaixo */
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
  padding: 0.4rem 0.75rem;
  cursor: pointer;
}
.sidebar__toggle:hover { border-color: var(--accent); color: var(--accent); }

.sidebar__toggle-icon,
.sidebar__toggle-icon::before,
.sidebar__toggle-icon::after {
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
}
.sidebar__toggle-icon {
  position: relative;
}
.sidebar__toggle-icon::before,
.sidebar__toggle-icon::after {
  content: '';
  position: absolute;
  left: 0;
}
.sidebar__toggle-icon::before { top: -5px; }
.sidebar__toggle-icon::after { top: 5px; }

.sidebar__label {
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink);
  margin: 0;
}

.sidebar ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.sidebar > ul > li { margin-bottom: 0.55rem; }

.sidebar a {
  color: var(--ink);
  text-decoration: none;
  display: inline-block;
  padding: 0.12rem 0;
  border-left: 2px solid transparent;
  padding-left: 0.6rem;
  margin-left: -0.6rem;
}
.sidebar a:hover { color: var(--accent); }
.sidebar a[aria-current="page"] {
  color: var(--accent);
  border-left-color: var(--accent);
  font-weight: 700;
}

.sidebar ul ul {
  margin: 0.35rem 0 0 0.9rem;
  padding-left: 0.7rem;
  border-left: 1px solid var(--rule);
}
.sidebar ul ul a { font-size: 0.92em; color: var(--ink-soft); }
.sidebar ul ul a[aria-current="page"] { color: var(--accent); }

/* ---------------------------------------------------------------------
   Rodapé
   --------------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--rule-strong);
  background: var(--paper-shade);
  padding: 2rem 1.5rem;
  font-family: var(--font-sans);
}
.site-footer__inner {
  max-width: 74rem;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 2rem;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.78rem;
  color: var(--ink-soft);
}
.site-footer a { color: var(--ink-soft); }
.site-footer a:hover { color: var(--accent); }
.site-footer__links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.4rem;
  margin: 0;
  padding: 0;
}

/* ---------------------------------------------------------------------
   Estados utilitários
   --------------------------------------------------------------------- */
.state-message {
  font-family: var(--font-sans);
  color: var(--ink-soft);
  font-size: 0.92rem;
  padding: 2rem 0;
}
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 0.6rem 1rem;
  z-index: 100;
}
.skip-link:focus { left: 1rem; top: 1rem; }

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
}

/* ---------------------------------------------------------------------
   Barra lateral em menu hambúrguer — telas pequenas
   (fica ao final do arquivo de propósito, para sobrepor as regras
   gerais de .sidebar definidas acima na cascata)
   --------------------------------------------------------------------- */
@media (max-width: 860px) {
  .sidebar {
    border-left: none;
    border-bottom: 1px solid var(--rule);
    padding-left: 0;
    padding-bottom: 1.1rem;
  }

  .sidebar__toggle { display: inline-flex; }

  /* Sumário fica escondido por padrão; o botão revela/esconde */
  #sidebar-nav { display: none; }
  .sidebar.is-open #sidebar-nav {
    display: block;
    margin-top: 1rem;
  }
  .sidebar.is-open .sidebar__toggle { border-color: var(--accent); color: var(--accent); }
}