/* ---------- tokens ---------- */
:root{
  --bg: #FAFAF7;
  --ink: #1B1B18;
  --muted: #6F6A63;
  --line: #E6E2DA;
  --accent: #38536B;
  --accent-soft: #C7D6DE;
  --card-bg: #FFFFFF;

  --serif: "Source Serif 4", Georgia, serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

/* ---------- reset ---------- */
*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a{ color: inherit; }
img{ max-width: 100%; display:block; }
code{ font-family: var(--mono); font-size: 0.9em; background: rgba(56,83,107,0.08); padding: 0.05em 0.35em; border-radius: 3px; }

/* language toggle visibility */
body[data-lang="pt"] .lang-en{ display:none; }
body[data-lang="en"] .lang-pt{ display:none; }
body[data-lang="pt"] .lt-pt{ font-weight:600; color:var(--ink); }
body[data-lang="pt"] .lt-en{ color:var(--muted); }
body[data-lang="en"] .lt-en{ font-weight:600; color:var(--ink); }
body[data-lang="en"] .lt-pt{ color:var(--muted); }

.wrap{
  max-width: 740px;
  margin: 0 auto;
  padding: 56px 26px 48px;
}

/* ---------- top bar (subpages) ---------- */
.topbar{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 28px;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--line);
}
.back-link{
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--muted);
  transition: color 0.15s ease;
}
.back-link:hover{ color: var(--accent); }
.back-link svg{ width: 16px; height: 16px; }

.topbar-nav{
  display: flex;
  gap: 18px;
}
.topbar-nav a{
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--muted);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.topbar-nav a:hover, .topbar-nav a.current{ color: var(--accent); border-color: var(--accent); }

/* ---------- header / hero (home) ---------- */
.hero{
  position: relative;
  text-align: center;
  padding-bottom: 46px;
}

.lang-toggle{
  position: absolute;
  top: -30px;
  right: 0;
  background: none;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 6px 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  cursor: pointer;
  color: var(--muted);
}
.lang-toggle:hover{ border-color: var(--accent); }
.lt-sep{ margin: 0 4px; opacity: 0.5; }

.portrait{
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 26px;
  border: 1px solid var(--line);
}

h1{
  font-family: var(--serif);
  font-weight: 600;
  font-size: 2.5rem;
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}

.identity-line{
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.18rem;
  color: var(--muted);
  max-width: 480px;
  margin: 0 auto 34px;
  line-height: 1.55;
}

.kernel-visual{
  margin: 0 auto 30px;
  max-width: 560px;
}
.kernel-visual img{
  width: 100%;
  height: auto;
  display: block;
}
.kernel-caption{
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--muted);
  margin: 12px auto 0;
  max-width: 480px;
  line-height: 1.5;
}
.kernel-caption a{
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--accent-soft);
}
.kernel-caption a:hover{ border-color: var(--accent); }

.icons{
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: 34px;
}
.icon-link{
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  color: var(--muted);
  transition: color 0.15s ease;
}
.icon-link:hover{ color: var(--accent); }
.icon-link svg{ width: 23px; height: 23px; }
.icon-link span{
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.section-nav{
  display: flex;
  justify-content: center;
  gap: 28px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}
.section-nav a{
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--muted);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.section-nav a:hover{ color: var(--accent); border-color: var(--accent); }

/* ---------- page content (subpages) ---------- */
.page-head{
  margin-bottom: 34px;
}
.eyebrow{
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 14px;
}

.page-head h2, .section h2{
  font-family: var(--serif);
  font-size: 1.7rem;
  font-weight: 600;
  margin: 0 0 16px;
}

.section-intro{
  color: var(--muted);
  max-width: 58ch;
  margin: 0 0 30px;
}
.section-intro a{ color: var(--accent); }

/* ---------- ensino / courses ---------- */
.courses{
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.course{
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 22px 24px;
}
.course-head{
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}
.course h3{
  font-family: var(--serif);
  font-size: 1.14rem;
  font-weight: 600;
  margin: 0;
}
.tag{
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.02em;
  color: var(--accent);
  background: rgba(56,83,107,0.08);
  padding: 3px 8px;
  border-radius: 4px;
  white-space: nowrap;
}
.course-desc{
  color: var(--muted);
  font-size: 0.97rem;
  margin: 0 0 15px;
}
.course-guest{ border-style: dashed; }

.pill-row{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.pill-row a{
  font-family: var(--mono);
  font-size: 0.8rem;
  text-decoration: none;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 5px 11px;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}
.pill-row a:hover{
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(56,83,107,0.06);
}
.pill-note{
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--muted);
  padding: 5px 2px;
}

/* ---------- gkrreg ---------- */
.feature-list{
  list-style: none;
  padding: 0;
  margin: 0 0 28px;
  display: flex;
  flex-direction: column;
  gap: 11px;
}
.feature-list li{
  position: relative;
  padding-left: 20px;
  color: var(--ink);
  font-size: 0.99rem;
}
.feature-list li::before{
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

/* ---------- about ---------- */
.about-text p{
  max-width: 62ch;
  font-size: 1.03rem;
  margin: 0 0 20px;
}
.about-text p:last-child{ margin-bottom: 0; }

/* ---------- blog empty state ---------- */
.empty-state{
  text-align: center;
  padding: 36px 20px;
  border: 1px dashed var(--line);
  border-radius: 10px;
  color: var(--muted);
}
.empty-state svg{ width: 32px; height: 32px; margin: 0 auto 16px; }
.empty-state p{ margin: 0 0 12px; }
.empty-state a{
  font-family: var(--mono);
  font-size: 0.88rem;
  text-decoration: none;
  color: var(--accent);
  border-bottom: 1px solid var(--accent-soft);
}
.empty-state a:hover{ border-color: var(--accent); }

/* ---------- footer ---------- */
.footer{
  padding-top: 40px;
  margin-top: 8px;
  text-align: center;
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--muted);
}
.footer a{ color: var(--muted); }
.footer a:hover{ color: var(--accent); }

/* ---------- focus states ---------- */
a:focus-visible, button:focus-visible{
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

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

/* ---------- responsive ---------- */
@media (max-width: 500px){
  .wrap{ padding: 48px 20px 36px; }
  h1{ font-size: 2rem; }
  .portrait{ width: 120px; height: 120px; }
  .lang-toggle{ position: static; display: inline-block; margin-bottom: 22px; }
  .section-nav{ gap: 18px; flex-wrap: wrap; }
  .icons{ gap: 16px; }
  .topbar{ flex-wrap: wrap; row-gap: 12px; }
}