/* ── Fontes ───────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Lora:ital,wght@0,400;0,500;1,400&family=DM+Sans:wght@300;400;500&family=JetBrains+Mono:wght@400&display=swap');

/* ── Reset mínimo ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── Variáveis ────────────────────────────────────────── */
:root {
  --text:        #1a1a1a;
  --text-muted:  #666;
  --text-faint:  #999;
  --border:      #e8e8e8;
  --bg:          #fafaf8;
  --bg-block:    #f4f3ef;
  --accent:      #534AB7;
  --accent-bg:   #EEEDFE;
  --font-body:   'DM Sans', sans-serif;
  --font-serif:  'Lora', serif;
  --font-mono:   'JetBrains Mono', monospace;
  --col:         640px;
  --gap:         2rem;
}

/* ── Base ─────────────────────────────────────────────── */
html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* ── Layout ───────────────────────────────────────────── */
.container {
  max-width: var(--col);
  margin: 0 auto;
  padding: 3rem 1.25rem 4rem;
}

/* ── Cabeçalho do site ────────────────────────────────── */
.site-header {
  margin-bottom: 3rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.site-header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.25rem;
}

.site-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: -0.2px;
  color: var(--text);
}

.site-title:hover { color: var(--accent); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 0.75rem;
}

.site-nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.8rem;
  color: var(--text-faint);
  transition: color 0.15s;
}
.site-nav-link:hover { color: var(--accent); }

.site-author {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.15rem;
}

.site-desc {
  font-size: 0.8rem;
  color: var(--text-faint);
  letter-spacing: 0.4px;
}

/* ── Post ─────────────────────────────────────────────── */
.post { }

.post-header {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  margin-bottom: 0.625rem;
}

.tag {
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--accent-bg);
  color: var(--accent);
}

.post-date {
  font-size: 0.75rem;
  color: var(--text-faint);
}

.post-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 500;
  line-height: 1.3;
  margin-bottom: 1.25rem;
  color: var(--text);
}

.post-title a:hover { color: var(--accent); }
.post-title.single { cursor: default; }

/* ── Conteúdo do post ─────────────────────────────────── */
.post-content { font-size: 0.9375rem; }

.post-content p {
  margin-bottom: 1rem;
  color: var(--text);
}

.post-content h2 {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 500;
  margin: 2rem 0 0.75rem;
  color: var(--text);
}

.post-content h3 {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 500;
  margin: 1.5rem 0 0.5rem;
  color: var(--text);
}

.post-content h4 {
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin: 1.5rem 0 0.5rem;
}

.post-content strong { font-weight: 500; }
.post-content em     { font-style: italic; }

.post-content a {
  color: var(--accent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}
.post-content a:hover { border-color: var(--accent); }

.post-content ul,
.post-content ol {
  margin: 0.75rem 0 1rem 1.5rem;
}

.post-content li { margin-bottom: 0.25rem; }

.post-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

/* ── Código ───────────────────────────────────────────── */
.post-content code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  background: var(--bg-block);
  padding: 1px 5px;
  border-radius: 3px;
  color: var(--text);
}

.post-content pre {
  background: var(--bg-block);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
  overflow-x: auto;
}

.post-content pre code {
  background: none;
  padding: 0;
  font-size: 0.8125rem;
  line-height: 1.6;
}

/* ── Tabelas ──────────────────────────────────────────── */
.post-content table {
  border-collapse: collapse;
  margin: 1.25rem 0;
  width: 100%;
  font-size: 0.9rem;
}

.post-content th {
  text-align: left;
  padding: 0.45rem 1rem 0.45rem 0;
  color: var(--text-muted);
  font-weight: 500;
  border-bottom: 2px solid var(--border);
}

.post-content td {
  padding: 0.4rem 1rem 0.4rem 0;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.post-content tr:last-child td { border-bottom: none; }

/* ── Blocos de LaTeX (MathJax renderiza dentro de p) ──── */
.post-content .MathJax {
  font-size: 1rem !important;
}

/* Destaque para equações em bloco */
.post-content mjx-container[display="true"] {
  display: block;
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  background: var(--bg-block);
  border-left: 2px solid #AFA9EC;
  border-radius: 0 6px 6px 0;
  overflow-x: auto;
}

/* ── Separador entre posts ────────────────────────────── */
.post-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 3rem 0;
}

/* ── Rodapé do post ───────────────────────────────────── */
.post-footer {
  margin-top: 1.5rem;
}

.permalink {
  font-size: 0.8125rem;
  color: var(--text-faint);
  border-bottom: 1px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}
.permalink:hover {
  color: var(--text);
  border-color: var(--border);
}

/* ── Rodapé do site ───────────────────────────────────── */
.site-footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.8125rem;
  color: var(--text-faint);
}

.site-footer-link {
  color: var(--text-faint);
  transition: color 0.15s;
}
.site-footer-link:hover { color: var(--accent); }

/* ── Vazio ────────────────────────────────────────────── */
.empty {
  color: var(--text-muted);
  font-size: 0.9375rem;
}
.empty code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  background: var(--bg-block);
  padding: 1px 5px;
  border-radius: 3px;
}

/* ── Paginação ────────────────────────────────────────── */
.pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.8125rem;
}

.pag-arrow {
  color: var(--text-faint);
  transition: color 0.15s;
}
.pag-arrow:hover { color: var(--accent); }
.pag-disabled { opacity: 0.3; pointer-events: none; }

.pag-pages {
  display: flex;
  gap: 0.25rem;
}

.pag-num {
  width: 1.75rem;
  height: 1.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  color: var(--text-faint);
  transition: color 0.15s, background 0.15s;
}
.pag-num:hover { color: var(--accent); background: var(--accent-bg); }
.pag-current {
  background: var(--accent);
  color: #fff !important;
  font-weight: 500;
}

/* ── Página /arquivo ─────────────────────────────────── */
.arquivo-titulo {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.arquivo-subtitulo {
  font-size: 0.8rem;
  color: var(--text-faint);
  margin-bottom: 2.5rem;
}

.arquivo-lista {
  list-style: none;
  margin: 0;
  padding: 0;
}

.arquivo-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--border);
}

.arquivo-item:first-child { border-top: 1px solid var(--border); }

.arquivo-link {
  font-size: 0.9375rem;
  color: var(--text);
  transition: color 0.15s;
  flex: 1;
}
.arquivo-link:hover { color: var(--accent); }

.arquivo-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.arquivo-data {
  font-size: 0.75rem;
  color: var(--text-faint);
  white-space: nowrap;
}

/* ── Página /sobre ────────────────────────────────────── */
.sobre-foto {
  display: block;
  width: 120px;
  height: 120px;
  object-fit: cover;
  border-radius: 50%;
  margin: 0 0 1.75rem;
}

@media (max-width: 680px) {
  .sobre-foto { width: 88px; height: 88px; }
}

/* ── Mobile ───────────────────────────────────────────── */
@media (max-width: 680px) {
  .container { padding: 2rem 1rem 3rem; }
  .post-title { font-size: 1.25rem; }
}

/* ── Botão de tema ────────────────────────────────────── */
.theme-toggle {
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  border: none;
  padding: 0;
  cursor: pointer;
  color: var(--text-faint);
  display: inline-flex;
  align-items: center;
  line-height: 1;
  transition: color 0.15s;
}
.theme-toggle:hover { color: var(--accent); }

/* ── Dark mode ────────────────────────────────────────── */
/* Fallback sem JS: segue sistema quando data-theme não está em "light" */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --text:        #e8e6e0;
    --text-muted:  #888680;
    --text-faint:  #5e5c56;
    --border:      #2a2926;
    --bg:          #111110;
    --bg-block:    #1e1d1b;
    --accent:      #9089D8;
    --accent-bg:   #1c1a38;
  }
  :root:not([data-theme="light"]) .post-content mjx-container[display="true"] {
    border-left-color: #6660a8;
  }
}

/* Override manual via data-theme="dark" */
:root[data-theme="dark"] {
  --text:        #e8e6e0;
  --text-muted:  #888680;
  --text-faint:  #5e5c56;
  --border:      #2a2926;
  --bg:          #111110;
  --bg-block:    #1e1d1b;
  --accent:      #9089D8;
  --accent-bg:   #1c1a38;
}
:root[data-theme="dark"] .post-content mjx-container[display="true"] {
  border-left-color: #6660a8;
}