:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --bg-card: #ffffff;
  --text: #1a1d21;
  --text-soft: #5b636d;
  --text-faint: #8a929c;
  --border: #e6e8eb;
  --accent: #2563eb;
  --accent-soft: #eff4ff;
  --code-bg: #f6f7f9;
  --radius: 14px;
  --radius-sm: 9px;
  --wrap: 760px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --shadow: 0 1px 2px rgba(16,24,40,.04), 0 6px 20px rgba(16,24,40,.06);
}

:root[data-theme="dark"] {
  --bg: #0e1116;
  --bg-soft: #161b22;
  --bg-card: #161b22;
  --text: #e6edf3;
  --text-soft: #a7b0ba;
  --text-faint: #6e7781;
  --border: #262c36;
  --accent: #4d8bff;
  --accent-soft: #15213a;
  --code-bg: #10151c;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1116;
    --bg-soft: #161b22;
    --bg-card: #161b22;
    --text: #e6edf3;
    --text-soft: #a7b0ba;
    --text-faint: #6e7781;
    --border: #262c36;
    --accent: #4d8bff;
    --accent-soft: #15213a;
    --code-bg: #10151c;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 16px; }

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

.skip {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--accent); color: #fff; padding: 10px 16px; border-radius: 0 0 8px 0;
}
.skip:focus { left: 0; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; gap: 14px; padding: 12px 16px; }
.brand { display: flex; align-items: center; gap: 11px; color: var(--text); min-width: 0; }
.brand:hover { text-decoration: none; }
.brand-mark {
  font-size: 20px; width: 38px; height: 38px; flex: none;
  display: block; border-radius: 10px; object-fit: cover;
}
.brand-text { display: flex; flex-direction: column; min-width: 0; }
.brand-title { font-weight: 700; font-size: 1rem; letter-spacing: -.01em; }
.brand-sub { font-size: .76rem; color: var(--text-faint); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.social { margin-left: auto; display: flex; gap: 2px; }
.social a {
  width: 36px; height: 36px; display: grid; place-items: center;
  border-radius: 9px; color: var(--text-soft);
}
.social a:hover { background: var(--bg-soft); color: var(--text); text-decoration: none; }
.social svg { width: 18px; height: 18px; }

.lang-switch {
  display: flex; gap: 2px; padding: 3px; border: 1px solid var(--border);
  border-radius: 9px; background: var(--bg-soft);
}
.lang-btn {
  border: none; background: none; cursor: pointer; font: 600 .72rem var(--mono);
  letter-spacing: .02em; color: var(--text-faint); padding: 4px 8px; border-radius: 6px; transition: .12s;
}
.lang-btn:hover { color: var(--text); }
.lang-btn[aria-pressed="true"] { background: var(--bg-card); color: var(--accent); box-shadow: var(--shadow); }

.theme-toggle {
  width: 36px; height: 36px; flex: none; border: 1px solid var(--border);
  background: var(--bg-card); color: var(--text-soft); border-radius: 9px;
  cursor: pointer; display: grid; place-items: center; transition: .15s;
}
.theme-toggle:hover { color: var(--text); border-color: var(--text-faint); }
.theme-toggle svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.i-moon { display: none; }
:root[data-theme="dark"] .i-sun { display: none; }
:root[data-theme="dark"] .i-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .i-sun { display: none; }
  :root:not([data-theme="light"]) .i-moon { display: block; }
}

main { padding: 28px 16px 60px; min-height: 60vh; }

/* ---------- search ---------- */
.search-bar { position: relative; margin-bottom: 14px; }
.search-icon {
  position: absolute; left: 14px; top: 50%; transform: translateY(-50%);
  width: 18px; height: 18px; fill: none; stroke: var(--text-faint); stroke-width: 2; stroke-linecap: round;
  pointer-events: none;
}
#search {
  width: 100%; padding: 13px 44px 13px 44px; font-size: 1rem; font-family: inherit;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--bg-card); color: var(--text); transition: .15s;
}
#search:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.kbd-hint {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  font: 600 .72rem var(--mono); color: var(--text-faint);
  border: 1px solid var(--border); border-radius: 6px; padding: 1px 7px; background: var(--bg-soft);
}
#search:focus ~ .kbd-hint { opacity: 0; }

/* ---------- tags filter ---------- */
.tags { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 22px; }
.tag-chip {
  font-size: .8rem; padding: 5px 12px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--border); background: var(--bg-card); color: var(--text-soft); transition: .12s;
}
.tag-chip:hover { border-color: var(--accent); color: var(--text); }
.tag-chip[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ---------- post list ---------- */
.post-list { display: flex; flex-direction: column; }
.post-card {
  display: block; padding: 20px 4px; border-bottom: 1px solid var(--border); color: var(--text);
}
.post-card:hover { text-decoration: none; }
.post-card:hover .post-card-title { color: var(--accent); }
.post-card-title { font-size: 1.28rem; font-weight: 700; letter-spacing: -.015em; margin: 0 0 6px; transition: color .12s; }
.post-card-desc { color: var(--text-soft); margin: 0 0 10px; }
.post-card-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; font-size: .82rem; color: var(--text-faint); }
.post-card-meta .dot { width: 3px; height: 3px; border-radius: 50%; background: currentColor; }
.chip-mini { font-size: .74rem; color: var(--accent); background: var(--accent-soft); padding: 2px 9px; border-radius: 999px; }
.chip-lang {
  font: 600 .68rem var(--mono); color: var(--text-faint); background: var(--bg-soft);
  border: 1px solid var(--border); padding: 1px 7px; border-radius: 999px;
}
.lang-note {
  font-size: .85rem; color: var(--text-soft); background: var(--bg-soft);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 9px 13px; margin: 0 0 22px;
}

.loading, .empty { color: var(--text-faint); text-align: center; padding: 40px 0; }

.back { display: inline-block; margin-bottom: 20px; color: var(--text-soft); font-size: .9rem; }
.back:hover { color: var(--accent); text-decoration: none; }

/* ---------- post ---------- */
.post-head { margin-bottom: 30px; padding-bottom: 22px; border-bottom: 1px solid var(--border); }
.post-head h1 { font-size: 2.1rem; line-height: 1.2; letter-spacing: -.025em; margin: 0 0 14px; }
.post-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; color: var(--text-faint); font-size: .86rem; }
.post-tags { display: inline-flex; gap: 6px; flex-wrap: wrap; }

/* ---------- markdown ---------- */
.markdown { font-size: 1.05rem; }
.markdown > *:first-child { margin-top: 0; }
.markdown h2 { font-size: 1.5rem; letter-spacing: -.02em; margin: 2em 0 .6em; padding-bottom: .2em; border-bottom: 1px solid var(--border); }
.markdown h3 { font-size: 1.22rem; margin: 1.6em 0 .5em; }
.markdown h4 { font-size: 1.05rem; margin: 1.4em 0 .4em; }
.markdown p { margin: 0 0 1.1em; }
.markdown a { text-decoration: underline; text-underline-offset: 2px; }
.markdown ul, .markdown ol { padding-left: 1.4em; margin: 0 0 1.1em; }
.markdown li { margin: .3em 0; }
.markdown img { max-width: 100%; height: auto; border-radius: var(--radius-sm); }
.markdown blockquote {
  margin: 1.2em 0; padding: .4em 1.1em; border-left: 3px solid var(--accent);
  color: var(--text-soft); background: var(--bg-soft); border-radius: 0 8px 8px 0;
}
.markdown blockquote p:last-child { margin-bottom: 0; }
.markdown code {
  font-family: var(--mono); font-size: .88em; background: var(--code-bg);
  padding: .18em .4em; border-radius: 5px; border: 1px solid var(--border);
}
.markdown pre {
  background: var(--code-bg); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 16px 18px; overflow-x: auto; margin: 0 0 1.2em; line-height: 1.55;
}
.markdown pre code { background: none; border: none; padding: 0; font-size: .86rem; }
.markdown hr { border: none; border-top: 1px solid var(--border); margin: 2.4em 0; }
/* diagramas (SVG inline) */
.markdown .svg-scroll { overflow-x: auto; overflow-y: hidden; margin: 1.5rem 0; }
.markdown .svg-scroll svg { margin-top: 0; margin-bottom: 0; }
.markdown table { width: 100%; border-collapse: collapse; margin: 0 0 1.2em; font-size: .94rem; }
.markdown th, .markdown td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.markdown th { background: var(--bg-soft); }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--border); margin-top: 40px; padding: 26px 16px;
  color: var(--text-faint); font-size: .85rem;
}
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; align-items: center; }
.footer-social { display: flex; gap: 14px; }
.footer-social a { color: var(--text-soft); }

@media (max-width: 560px) {
  .brand-sub { display: none; }
  .post-head h1 { font-size: 1.7rem; }
  .markdown { font-size: 1rem; }
}
@media (max-width: 520px) {
  .header-inner { gap: 8px; }
  .social { display: none; }           /* ícones ficam no rodapé */
  .lang-btn { padding: 4px 6px; }
}
/* diagramas horizontais: mantêm tamanho legível e rolam na horizontal no mobile */
@media (max-width: 640px) {
  .markdown .svg-scroll.wide svg { min-width: 600px; }
}

/* reduz motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}