/* ============================================================
   Danilo Naiff — personal site
   Quiet, warm, serif. Slate-blue accent. Monospace meta labels.
   Design tokens first; components reference tokens only.
   ============================================================ */

:root {
  /* warm paper ground, pulled slightly grey to avoid the cream cliché */
  --paper:        #f2f0e9;
  --paper-raised: #fbfaf5;
  --ink:          #1f1e1b;
  --ink-soft:     #56524a;
  --ink-faint:    #8b867a;
  --rule:         #dcd7ca;
  --accent:       #3a5a74;
  --accent-ink:   #2b4457;

  --serif-display: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --serif-body:    Charter, "Bitstream Charter", "Iowan Old Style", Cambria, Georgia, serif;
  --mono:          ui-monospace, "SF Mono", "Cascadia Mono", "Roboto Mono", Menlo, Consolas, monospace;

  --measure: 40rem;
  --step:    1.6rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:        #17181b;
    --paper-raised: #1e2024;
    --ink:          #e9e6de;
    --ink-soft:     #b0aba0;
    --ink-faint:    #7c776c;
    --rule:         #2d2f34;
    --accent:       #8fb6d1;
    --accent-ink:   #a9c8dd;
  }
}
/* explicit theme toggle wins over the media query, in both directions */
:root[data-theme="light"] {
  --paper:#f2f0e9; --paper-raised:#fbfaf5; --ink:#1f1e1b; --ink-soft:#56524a;
  --ink-faint:#8b867a; --rule:#dcd7ca; --accent:#3a5a74; --accent-ink:#2b4457;
}
:root[data-theme="dark"] {
  --paper:#17181b; --paper-raised:#1e2024; --ink:#e9e6de; --ink-soft:#b0aba0;
  --ink-faint:#7c776c; --rule:#2d2f34; --accent:#8fb6d1; --accent-ink:#a9c8dd;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.wrap {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 2.4rem 1.5rem 5rem;
}

/* ---- top bar: just the two toggles, quiet ---- */
.topbar {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 1.1rem 1.5rem 0;
  display: flex;
  justify-content: flex-end;
  gap: 1.1rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
}
.toggle {
  background: none;
  border: none;
  color: var(--ink-faint);
  cursor: pointer;
  padding: 0.2rem 0;
  font: inherit;
  letter-spacing: inherit;
  text-transform: uppercase;
}
.toggle:hover { color: var(--accent); }
.toggle .on { color: var(--ink); }

/* ---- hero ---- */
.hero { margin-bottom: 2.8rem; }
.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 0.9rem;
}
h1.name {
  font-family: var(--serif-display);
  font-weight: 600;
  font-size: 2.5rem;
  line-height: 1.05;
  letter-spacing: -0.01em;
  margin: 0 0 0.7rem;
  text-wrap: balance;
}
.tagline {
  font-size: 1.2rem;
  line-height: 1.4;
  color: var(--ink-soft);
  margin: 0;
  text-wrap: balance;
}
.intro p { margin: 1.1rem 0 0; }
.intro { margin-top: 1.6rem; }

/* ---- sections ---- */
section { margin-top: 3.2rem; }
.sec-head {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  border-top: 1px solid var(--rule);
  padding-top: 1.1rem;
  margin-bottom: 1.4rem;
}
.sec-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0;
  white-space: nowrap;
}
.sec-note {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-faint);
  margin: 0;
  margin-left: auto;
}

/* ---- entry lists (writing, software) ---- */
.list { display: flex; flex-direction: column; gap: 1.5rem; }
.item { display: block; text-decoration: none; color: inherit; }
a.item:hover .item-title { color: var(--accent); }
.item-meta {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.03em;
  color: var(--ink-faint);
  text-transform: uppercase;
  margin: 0 0 0.25rem;
}
.item-title {
  font-family: var(--serif-display);
  font-size: 1.16rem;
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 0.2rem;
  transition: color 0.15s ease;
}
.item-title .orig { font-style: normal; }
.item-desc { color: var(--ink-soft); font-size: 0.98rem; line-height: 1.5; margin: 0; }
.item-desc .gloss { color: var(--ink-faint); font-style: italic; }

/* subgroup heading inside a section (Notes / Essays) */
.subhead {
  font-family: var(--serif-display);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 1rem;
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}
.subhead + .list { margin-bottom: 2.2rem; }
.subhead .k {
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

/* inline text links */
a.link {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  transition: border-color 0.15s ease, color 0.15s ease;
}
a.link:hover { color: var(--accent-ink); border-bottom-color: var(--accent); }

.more { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.03em; margin-top: 1.3rem; }
.more a { color: var(--accent); text-decoration: none; }
.more a:hover { text-decoration: underline; }

/* ---- elsewhere / footer ---- */
.rows { display: flex; flex-direction: column; gap: 0.5rem; margin-top: 0.2rem; }
.row {
  display: flex;
  gap: 1rem;
  align-items: baseline;
  font-size: 0.98rem;
}
.row .rk {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  min-width: 6.5rem;
  flex-shrink: 0;
}
.row a { color: var(--accent); text-decoration: none; border-bottom: 1px solid color-mix(in srgb, var(--accent) 30%, transparent); }
.row a:hover { color: var(--accent-ink); border-bottom-color: var(--accent); }

footer {
  margin-top: 3.5rem;
  border-top: 1px solid var(--rule);
  padding-top: 1.2rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--ink-faint);
  letter-spacing: 0.03em;
}

/* ---- bilingual visibility (markup uses .en / .pt spans & blocks) ---- */
:root[data-lang="en"] .pt { display: none; }
:root[data-lang="pt"] .en { display: none; }
/* default before JS runs: show EN, hide PT */
:root:not([data-lang]) .pt { display: none; }

/* ---- article (note.html) ---- */
.article { font-size: 1.075rem; }
.article .article-head { margin-bottom: 2rem; }
.article h1 {
  font-family: var(--serif-display);
  font-weight: 600;
  font-size: 2rem;
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0.4rem 0 0.6rem;
  text-wrap: balance;
}
.article .article-meta {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.prose { }
.prose h2 { font-family: var(--serif-display); font-size: 1.4rem; font-weight: 600; margin: 2.4rem 0 0.8rem; letter-spacing: -0.01em; }
.prose h3 { font-family: var(--serif-display); font-size: 1.15rem; font-weight: 600; margin: 1.8rem 0 0.6rem; }
.prose p { margin: 1rem 0; }
.prose a { color: var(--accent); text-decoration: none; border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent); }
.prose a:hover { color: var(--accent-ink); border-bottom-color: var(--accent); }
.prose ul, .prose ol { padding-left: 1.3rem; }
.prose li { margin: 0.35rem 0; }
.prose blockquote {
  margin: 1.2rem 0;
  padding: 0.2rem 0 0.2rem 1.1rem;
  border-left: 2px solid var(--accent);
  color: var(--ink-soft);
  font-style: italic;
}
.prose img { max-width: 100%; height: auto; border-radius: 2px; }
.prose code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: color-mix(in srgb, var(--ink) 7%, transparent);
  padding: 0.12em 0.35em;
  border-radius: 3px;
}
.prose pre {
  background: var(--paper-raised);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  font-size: 0.86rem;
  line-height: 1.5;
}
.prose pre code { background: none; padding: 0; font-size: inherit; }
.prose table { border-collapse: collapse; width: 100%; font-size: 0.94rem; }
.prose th, .prose td { border: 1px solid var(--rule); padding: 0.4rem 0.6rem; text-align: left; }
.katex-display { overflow-x: auto; overflow-y: hidden; padding: 0.3rem 0; }

.backlink { font-family: var(--mono); font-size: 0.74rem; margin-bottom: 1.5rem; display: inline-block; }
.backlink a { color: var(--accent); text-decoration: none; }
.backlink a:hover { text-decoration: underline; }

/* focus + motion */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}
@keyframes rise { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.wrap > * { animation: rise 0.5s ease both; }
.wrap > *:nth-child(2) { animation-delay: 0.04s; }
.wrap > *:nth-child(3) { animation-delay: 0.08s; }
.wrap > *:nth-child(4) { animation-delay: 0.12s; }
.wrap > *:nth-child(5) { animation-delay: 0.16s; }

@media (max-width: 480px) {
  h1.name { font-size: 2rem; }
  .tagline { font-size: 1.08rem; }
  .row { flex-direction: column; gap: 0.1rem; }
  .row .rk { min-width: 0; }
}