/* Dr. Osvaldo L. Santos-Pereira — academic personal site
   Palette: warm ivory background, graphite text, deep petrol-blue accent.
   Typography: Source Serif 4 (name/headings) + Public Sans (nav/body), with system fallbacks. */

:root {
  --bg: #FAF9F5;
  --bg-alt: #F1EEE7;
  --text: #20242B;
  --text-muted: #5B6270;
  --border: #E1DDD3;
  --accent: #1F3B4D;
  --accent-soft: rgba(31, 59, 77, 0.12);
  --serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --sans: 'Public Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 84px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: var(--accent); }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 8px 14px;
  font-family: var(--sans);
  font-size: 14px;
  z-index: 100;
}
.skip-link:focus { left: 0; }

/* Header / nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 18px 32px;
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  align-items: center;
  column-gap: 56px;
}
.wordmark {
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.01em;
  white-space: nowrap;
}
.wordmark:hover { text-decoration: none; }

.site-nav { display: flex; align-items: center; justify-content: flex-start; gap: 13px; flex-wrap: nowrap; min-width: 0; }
.nav-link {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}
.nav-link:hover {
  color: var(--accent);
  border-bottom-color: var(--accent-soft);
  text-decoration: none;
}
.nav-link.active,
.nav-link[aria-current="page"] {
  color: var(--accent);
  font-weight: 600;
  border-bottom-color: var(--accent);
}

.lang-divider { width: 1px; height: 16px; background: var(--border); display: inline-block; }
.lang-switch { display: flex; align-items: center; gap: 8px; }
.lang-btn { font-family: var(--sans); font-size: 13px; font-weight: 600; letter-spacing: 0.03em; color: var(--text-muted); padding: 4px 2px; }
.lang-btn:hover { text-decoration: none; color: var(--accent); }
.lang-btn.active { color: var(--accent); }
.lang-sep { color: var(--border); font-size: 13px; }

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.hamburger span { display: block; width: 100%; height: 2px; background: var(--text); }

.mobile-nav-panel {
  display: none;
  flex-direction: column;
  padding: 4px 32px 20px;
  border-top: 1px solid var(--border);
  background: var(--bg);
  max-height: calc(100vh - 68px);
  max-height: calc(100dvh - 68px);
  overflow-y: auto;
  overscroll-behavior: contain;
}
.mobile-nav-panel.open { display: flex; }
.mobile-nav-panel .nav-link { font-size: 17px; padding: 12px 0; border-bottom: 1px solid var(--border); }
.mobile-nav-panel .nav-link.active { border-bottom-color: var(--border); }
.mobile-nav-panel .nav-link:hover,
.mobile-nav-panel .nav-link:focus-visible,
.mobile-nav-panel .nav-link.active,
.mobile-nav-panel .nav-link[aria-current="page"] {
  color: var(--accent);
}
.mobile-lang-row { display: flex; align-items: center; gap: 10px; padding: 14px 0 4px; }

.nav-link:focus-visible,
.lang-btn:focus-visible,
.wordmark:focus-visible,
.hamburger:focus-visible,
.links-row a:focus-visible,
.email-link:focus-visible,
.repo-name-link:focus-visible,
.repo-path a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.lang-btn:focus-visible {
  color: var(--accent);
  text-decoration: none;
}

.hamburger:focus-visible { border-radius: 2px; }

/* Layout */
main { display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 32px; }

/* Hero (landing page) */
.hero { padding: 80px 0 96px; }
.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  column-gap: 56px;
  align-items: start;
}
.hero-photo-wrap { width: 300px; max-width: 100%; }
.hero-photo {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  object-position: center;
  background: var(--bg-alt);
  border-radius: 6px;
}
.hero-text { min-width: 0; max-width: 640px; text-align: left; }
.name {
  font-family: var(--serif);
  font-size: 38px;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 10px;
  line-height: 1.2;
}
.subtitle { font-family: var(--sans); font-size: 17px; color: var(--accent); font-weight: 500; margin: 0 0 22px; }
.bio p { font-family: var(--sans); font-size: 16px; color: var(--text); line-height: 1.75; margin: 0 0 28px; text-align: justify; }
.links-row { display: flex; flex-wrap: wrap; gap: 10px 20px; list-style: none; padding: 0; margin: 0; }
.links-row li { margin: 0; }
.links-row a { font-family: var(--sans); font-size: 14px; color: var(--text-muted); border-bottom: 1px solid transparent; }
.links-row a:hover,
.links-row a:focus { color: var(--accent); border-bottom-color: var(--accent); text-decoration: none; }
.links-row a:focus-visible { color: var(--accent); text-decoration: none; }
.links-row a:focus:not(:focus-visible) { outline: none; }

@media (max-width: 1120px) {
  .header-inner { display: flex; justify-content: space-between; gap: 24px; }
  .site-nav { display: none; }
  .hamburger { display: flex; }
}

@media (max-width: 820px) {
  .hero { padding: 48px 0 64px; }
  .hero-inner { grid-template-columns: minmax(0, 1fr); row-gap: 32px; }
  .hero-photo-wrap { width: min(300px, 100%); }
  .hero-text { max-width: 760px; text-align: left; }
  .bio p { text-align: left; }
  .links-row { justify-content: flex-start; }
  .name { font-size: 30px; }
}

/* Inner pages */
.page-section { padding: 56px 0 96px; max-width: 760px; }
.page-title { font-family: var(--serif); font-size: 32px; font-weight: 600; color: var(--text); margin: 0 0 18px; }
.lead { font-family: var(--sans); font-size: 16px; color: var(--text-muted); line-height: 1.7; margin: 0 0 22px; }
.about-intro-p { font-family: var(--sans); font-size: 16px; color: var(--text-muted); line-height: 1.7; margin: 0; text-align: justify; }
.about-professional-p { font-family: var(--sans); font-size: 15.5px; color: var(--text); line-height: 1.7; margin: 0; text-align: justify; }
.about-intro-p.indented, .about-professional-p.indented { text-indent: 0; }
.block { margin-bottom: 44px; padding-top: 28px; border-top: 1px solid var(--border); }
.block-title { font-family: var(--serif); font-size: 21px; font-weight: 600; color: var(--text); margin: 0 0 14px; }
.sub-title { font-family: var(--serif); font-size: 18px; font-weight: 600; color: var(--text); margin: 0 0 6px; }
.body-p { font-family: var(--sans); font-size: 15.5px; color: var(--text); line-height: 1.7; margin: 0 0 16px; }
.plain-list { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 8px; }
.plain-list li { font-family: var(--sans); font-size: 15.5px; color: var(--text); }

.topic-stack { display: flex; flex-direction: column; }
.topic-row { padding: 20px 0; border-bottom: 1px solid var(--border); }

.pub-year-block { margin-bottom: 36px; padding-top: 24px; border-top: 1px solid var(--border); }
.pub-entry { margin-top: 18px; }
.pub-entry-separated { padding-top: 18px; border-top: 1px solid var(--border); }
.pub-meta { font-family: var(--sans); font-size: 13.5px; color: var(--text-muted); line-height: 1.5; margin: 2px 0 0; }
.pub-link-line { font-family: var(--sans); font-size: 13.5px; color: var(--text-muted); line-height: 1.5; margin: 6px 0 0; overflow-wrap: anywhere; word-break: break-word; }
.pub-link-line a { color: var(--accent); overflow-wrap: anywhere; word-break: break-word; }

.contact-email { font-family: var(--sans); font-size: 17px; color: var(--text); margin: 0 0 40px; }
.email-link { color: var(--accent); border-bottom: 1px solid var(--accent-soft); outline-offset: 3px; transition: border-color 0.15s ease; }
.email-link:hover,
.email-link:focus { border-bottom-color: var(--accent); text-decoration: none; }
.email-link:focus { outline: 2px solid var(--accent); }
.email-link:focus:not(:focus-visible) { outline: none; }

.address-block { border-left: 2px solid var(--accent); padding-left: 22px; margin: 0 0 44px; max-width: 100%; overflow-x: auto; padding-bottom: 4px; }
.address-name { font-family: var(--serif); font-size: 17px; font-weight: 600; color: var(--text); margin: 0 0 10px; line-height: 1.5; }
.address-line { font-family: var(--serif); font-size: 15px; font-weight: 400; color: var(--text-muted); margin: 0; line-height: 1.9; }
.address-line-nowrap { white-space: nowrap; width: max-content; min-width: 100%; }

/* Public repositories */
.repo-category { margin-bottom: 44px; }
.repo-list-flat { margin-top: 28px; border-top: 1px solid var(--border); }
.repo-list { display: flex; flex-direction: column; }
.repo-item { padding: 20px 0; border-bottom: 1px solid var(--border); }
.repo-name-heading { margin: 0 0 6px; font-weight: 600; }
.repo-name-link { font-family: var(--serif); font-size: 19px; font-weight: 600; color: var(--text); border-bottom: 1px solid transparent; outline-offset: 3px; }
.repo-name-link:hover { color: var(--accent); border-bottom-color: var(--accent-soft); text-decoration: none; }
.repo-name-link:focus { outline: 2px solid var(--accent); border-bottom-color: var(--accent); }
.repo-name-link:focus:not(:focus-visible) { outline: none; }
.repo-slug { font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace; font-size: 14px; font-weight: 400; color: var(--text-muted); }
.repo-path { font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace; font-size: 13px; color: var(--text-muted); margin: 0 0 8px; word-break: break-all; overflow-wrap: break-word; }
.repo-path a { color: var(--text-muted); border-bottom: 1px solid transparent; }
.repo-path a:hover { color: var(--accent); border-bottom-color: var(--accent-soft); text-decoration: none; }
.repo-path a:focus-visible { color: var(--accent); text-decoration: none; }
.repo-path a:focus:not(:focus-visible) { outline: none; }
.repo-desc { font-family: var(--sans); font-size: 15px; color: var(--text); line-height: 1.65; margin: 0; max-width: 620px; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 32px; text-align: center; background: var(--bg-alt); }
.footer-line { font-family: var(--sans); font-size: 13px; color: var(--text-muted); margin: 0 0 4px; }
.footer-tagline { font-family: var(--sans); font-size: 12px; color: #70695C; margin: 0; letter-spacing: 0.02em; }

@media (max-width: 560px) {
  .header-inner,
  .container,
  .hero-inner {
    padding-left: 20px;
    padding-right: 20px;
  }

  .mobile-nav-panel {
    padding-left: 20px;
    padding-right: 20px;
  }

  .address-block {
    padding-left: 18px;
  }
}


/* Editorial refinement — 2026-09 */
.header-inner { padding-top: 14px; padding-bottom: 14px; }
.site-nav > .nav-link:nth-of-type(3),
.site-nav > .nav-link:nth-of-type(6),
.mobile-nav-panel > .nav-link:nth-of-type(3),
.mobile-nav-panel > .nav-link:nth-of-type(6) { display: none; }

.hero { padding: 56px 0 64px; }
.hero-inner { grid-template-columns: 280px minmax(0, 1fr); column-gap: 48px; }
.hero-photo-wrap { width: 280px; }
.hero-text { max-width: 700px; }
.name { font-size: 36px; margin-bottom: 8px; }
.subtitle { font-size: 16.5px; line-height: 1.5; margin: 0 0 5px; }
.affiliation-line { margin: 0 0 16px; font-family: var(--sans); font-size: 13.5px; line-height: 1.5; color: var(--accent); }
.bio p { font-size: 15.5px; line-height: 1.65; margin: 0 0 12px; text-align: left; }
.link-groups { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 14px 28px; margin-top: 20px; }
.link-group-title { margin: 0 0 7px; font-size: 11.5px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--text-muted); }
.links-row { gap: 6px 15px; }
.links-row a { font-size: 13.5px; }

.home-pathways { border-top: 1px solid var(--border); }
.home-pathways-inner { max-width: 1200px; margin: 0 auto; padding: 28px 32px 26px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 30px; }
.home-pathway { padding-right: 20px; }
.home-pathway + .home-pathway { border-left: 1px solid var(--border); padding-left: 30px; }
.home-pathway h2 { margin: 0 0 7px; font-family: var(--serif); font-size: 21px; font-weight: 600; line-height: 1.25; }
.home-pathway p { margin: 0 0 9px; font-size: 14px; line-height: 1.55; color: var(--text-muted); }
.home-pathway a { font-size: 13.5px; }

.page-section { max-width: 820px; }
.page-title { font-size: 32px; }
.block-title { font-size: 22px; }
.sub-title { font-size: 18px; }
.body-p, .about-professional-p { font-size: 15.5px; }

.footer-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 7px 16px; margin: 0 0 9px; padding: 0; list-style: none; }
.footer-links a { font-size: 12.5px; color: var(--text-muted); border-bottom: 1px solid transparent; }
.footer-links a:hover, .footer-links a:focus-visible { color: var(--accent); border-bottom-color: var(--accent); text-decoration: none; }

@media (max-width: 820px) {
  .hero { padding: 38px 0 48px; }
  .hero-inner { row-gap: 26px; }
  .hero-photo-wrap { width: min(260px, 100%); }
  .link-groups { grid-template-columns: minmax(0, 1fr); }
  .home-pathways-inner { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .home-pathway { padding: 18px 0; }
  .home-pathway + .home-pathway { border-left: 0; border-top: 1px solid var(--border); padding-left: 0; }
}
@media (max-width: 560px) {
  .home-pathways-inner { padding-left: 20px; padding-right: 20px; }
}


/* Reference-template layout — 2026-09-09 */
.header-inner { max-width: 1240px; padding: 13px 28px; grid-template-columns: 330px minmax(0,1fr); column-gap: 36px; }
.wordmark { font-size: 18px; }
.site-nav { justify-content: flex-end; gap: 18px; }
.site-nav > .nav-link,
.mobile-nav-panel > .nav-link { display: inline-flex !important; }
.site-nav .nav-link { font-size: 13.5px; }

.hero-reference { padding: 34px 0 30px; }
.hero-reference-inner { max-width: 1240px; margin: 0 auto; padding: 0 28px; display: grid; grid-template-columns: 285px minmax(0, 1fr) 220px; gap: 32px; align-items: start; }
.hero-reference .hero-photo-wrap { width: 285px; }
.hero-reference .hero-photo { border-radius: 4px; aspect-ratio: 1 / 1.04; }
.hero-reference-copy { padding-top: 2px; min-width: 0; }
.hero-headline { margin: 0 0 10px; max-width: 560px; font-family: var(--serif); font-size: clamp(26px, 2.3vw, 34px); line-height: 1.12; font-weight: 500; letter-spacing: -0.018em; color: var(--text); }
.hero-person-name { margin: 0 0 7px; font-family: var(--serif); font-size: 24px; line-height: 1.25; font-weight: 650; color: var(--text); }
.hero-reference .affiliation-line { margin: 0 0 14px; font-size: 13px; color: var(--text-muted); }
.hero-reference .bio { max-width: 670px; }
.hero-reference .bio p { margin: 0 0 9px; font-size: 14.5px; line-height: 1.55; text-align: left; }
.hero-profile-links { border-left: 1px solid var(--border); padding-left: 24px; margin-top: 2px; }
.hero-link-group + .hero-link-group { margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--border); }
.hero-link-title { margin: 0 0 8px; font-family: var(--serif); font-size: 15px; font-weight: 600; }
.hero-link-group ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 7px; }
.hero-link-group a { font-size: 13.5px; color: var(--accent); }
.profile-icon-defs { position: absolute; width: 0; height: 0; overflow: hidden; }
.profile-platform-link { display: inline-flex; align-items: center; gap: 8px; line-height: 1.25; }
.profile-icon { width: 16px; height: 16px; flex: 0 0 16px; fill: currentColor; }
.profile-icon .icon-cutout { fill: var(--bg); }
.profile-platform-link:hover .profile-icon,
.profile-platform-link:focus-visible .profile-icon { color: var(--accent-dark); }

.home-visual-pathways { padding: 0 0 24px; }
.home-visual-pathways-inner { max-width: 1240px; margin: 0 auto; padding: 0 28px; display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 22px; }
.home-visual-card { border: 1px solid var(--border); border-radius: 4px; overflow: hidden; background: var(--bg); }
.home-visual-image { display: block; border-bottom: 1px solid var(--border); }
.home-visual-image img { width: 100%; aspect-ratio: 2.7 / 1; object-fit: cover; object-position: center; }
.home-visual-body { padding: 13px 15px 16px; }
.home-visual-body h2 { margin: 0 0 7px; font-family: var(--serif); font-size: 20px; line-height: 1.2; font-weight: 600; }
.home-visual-body h2 a { color: var(--text); }
.home-visual-body p { margin: 0 0 8px; font-size: 13.5px; line-height: 1.5; color: var(--text-muted); }
.home-card-link { font-size: 13px; }

.site-footer { padding: 24px 28px; }
.footer-links { margin-bottom: 7px; }

@media (max-width: 1040px) {
  .hero-reference-inner { grid-template-columns: 250px minmax(0,1fr); }
  .hero-reference .hero-photo-wrap { width: 250px; }
  .hero-profile-links { grid-column: 1 / -1; border-left: 0; border-top: 1px solid var(--border); padding: 16px 0 0; display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 24px; }
  .hero-link-group + .hero-link-group { margin: 0; padding: 0 0 0 24px; border-top: 0; border-left: 1px solid var(--border); }
}
@media (max-width: 760px) {
  .hero-reference { padding: 28px 0 26px; }
  .hero-reference-inner { padding: 0 20px; grid-template-columns: minmax(0,1fr); gap: 22px; }
  .hero-reference .hero-photo-wrap { width: min(260px,100%); }
  .hero-headline { font-size: clamp(25px, 7vw, 30px); max-width: 540px; }
  .hero-person-name { font-size: 23px; }
  .hero-profile-links { grid-template-columns: minmax(0,1fr); }
  .hero-link-group + .hero-link-group { padding: 16px 0 0; border-left: 0; border-top: 1px solid var(--border); }
  .home-visual-pathways-inner { padding: 0 20px; grid-template-columns: minmax(0,1fr); gap: 16px; }
  .home-visual-image img { aspect-ratio: 2.5 / 1; }
}

.footer-reference-inner { max-width: 1240px; margin: 0 auto; display: grid; grid-template-columns: minmax(220px,1fr) minmax(280px,1.2fr) auto; gap: 28px; align-items: end; text-align: left; }
.footer-identity { display: grid; gap: 3px; }
.footer-identity strong { font-family: var(--serif); font-size: 14px; font-weight: 600; color: var(--text); }
.footer-identity span { font-size: 11.5px; line-height: 1.45; color: var(--text-muted); }
.footer-copy { text-align: center; }
.footer-reference-inner .footer-links { justify-content: flex-end; margin: 0; align-self: center; }
@media (max-width: 760px) {
  .footer-reference-inner { grid-template-columns: minmax(0,1fr); gap: 12px; text-align: center; }
  .footer-copy { text-align: center; }
  .footer-reference-inner .footer-links { justify-content: center; }
}