/* ============================================================
   brunoartacho.com · Executive Technical Brand
   Design system: Sophisticated Minimalism
   Pillars: Technical Authority · Editorial Precision
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
  /* Surface / foreground */
  --bg:                 #FAFAF7;  /* off-white canvas */
  --text:               #141413;  /* near-black (warmed very slightly) */
  --text-muted:         #5A5A55;  /* secondary copy */
  --text-faint:         #858382;  /* metadata / captions */
  --rule:               #E5E5E1;  /* hairlines / borders */
  --surface-low:        #F4F4F0;  /* subtle fill (hover, input) */
  --surface-high:       #EEEEEA;
  --inverse:            #1A1C1A;  /* dark closing bands */
  --inverse-text:       #FAFAF7;

  /* Accent */
  --accent:             #1A2B42;  /* midnight blue */
  --accent-rule:        rgba(26, 43, 66, 0.12);

  /* Semantic */
  --link:               var(--text);
  --link-hover:         var(--accent);

  /* Layout */
  --container:          840px;
  --gutter:             24px;
  --section-gap:        80px;
  --component-gap:      24px;

  /* Radii */
  --r-sm:   2px;
  --r-md:   4px;
  --r-lg:   8px;

  /* Type */
  --ff-serif: "Newsreader", Georgia, "Times New Roman", serif;
  --ff-sans:  "Inter", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
}

/* ---------- Reset / Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--ff-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "kern" 1, "liga" 1;
}
img, svg { max-width: 100%; display: block; }
a { color: var(--link); text-decoration: none; transition: color 160ms ease; }
a:hover { color: var(--link-hover); }
ul, ol { padding-left: 20px; margin: 0 0 1em; }
li { margin-bottom: 6px; }
hr { border: 0; border-top: 1px solid var(--rule); margin: 40px 0; }
button { font-family: inherit; cursor: pointer; }

/* ---------- Typography ---------- */
.headline-xl {
  font-family: var(--ff-serif);
  font-size: 48px;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0;
}
.headline-lg {
  font-family: var(--ff-serif);
  font-size: 32px;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0;
}
.headline-md {
  font-family: var(--ff-serif);
  font-size: 24px;
  font-weight: 500;
  line-height: 1.3;
  margin: 0;
}
.body-lg {
  font-size: 18px;
  line-height: 1.6;
  letter-spacing: -0.01em;
  font-weight: 400;
}
.body-md {
  font-size: 16px;
  line-height: 1.6;
  font-weight: 400;
}
.body-sm {
  font-size: 14px;
  line-height: 1.6;
  font-weight: 400;
}
.label-caps {
  font-size: 12px;
  line-height: 1;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.label-caps-sm {
  font-size: 10px;
  line-height: 1;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}
.italic-serif { font-family: var(--ff-serif); font-style: italic; }

.muted      { color: var(--text-muted); }
.faint      { color: var(--text-faint); }
.accent     { color: var(--accent); }

/* Selection */
::selection { background: #D4E3FF; color: var(--text); }

/* ---------- Layout primitives ---------- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  width: 100%;
}
.section {
  margin-top: var(--section-gap);
  margin-bottom: var(--section-gap);
}
.section-top { margin-top: var(--section-gap); }
.section-bot { margin-bottom: var(--section-gap); }

/* ---------- Navigation ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg);
  border-bottom: 1px solid var(--rule);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px 0;
}
.nav-brand {
  font-family: var(--ff-serif);
  font-style: italic;
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
  letter-spacing: -0.01em;
}
.nav-links {
  display: flex;
  gap: 28px;
  align-items: center;
}
.nav-links a {
  font-family: var(--ff-serif);
  font-size: 14px;
  color: var(--text-muted);
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}
.nav-links a:hover { color: var(--text); }
.nav-links a.is-active {
  color: var(--text);
  border-bottom-color: var(--accent);
}
.nav-toggle {
  display: none;
  background: transparent;
  border: 0;
  padding: 4px;
  color: var(--text);
}
@media (max-width: 760px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg);
    padding: 8px 24px 24px;
    border-bottom: 1px solid var(--rule);
  }
  .nav-links.open a {
    padding: 14px 0;
    border-bottom: 1px solid var(--rule);
    width: 100%;
  }
  .nav-links.open a.is-active { border-bottom-color: var(--accent); }
  .nav-toggle { display: inline-flex; }
}

/* ---------- Page hero ---------- */
.hero {
  padding-top: 80px;
  padding-bottom: var(--section-gap);
}
.hero h1 { margin-bottom: 20px; }
.hero .lede {
  max-width: 640px;
  color: var(--text-muted);
}

/* ---------- Home hero split ---------- */
.home-hero {
  padding-top: 96px;
  padding-bottom: 96px;
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 64px;
  align-items: center;
}
@media (max-width: 760px) {
  .home-hero {
    grid-template-columns: 1fr;
    padding-top: 56px;
    padding-bottom: 48px;
    gap: 40px;
  }
}
.home-hero__eyebrow {
  color: var(--accent);
  margin-bottom: 20px;
}
.home-hero__headline {
  font-size: 56px;
  line-height: 1.05;
  letter-spacing: -0.02em;
}
@media (max-width: 760px) { .home-hero__headline { font-size: 40px; } }
.home-hero__headline em {
  font-style: italic;
  font-weight: 500;
  color: var(--text-muted);
}
.home-hero__sub {
  margin-top: 24px;
  color: var(--text-muted);
  max-width: 520px;
}
.portrait {
  aspect-ratio: 4 / 5;
  width: 100%;
  max-width: 360px;
  background: var(--surface-low);
  border: 1px solid var(--rule);
  border-radius: var(--r-sm);
  object-fit: cover;
  object-position: center 20%;
}

/* ---------- Credential strip ---------- */
.credstrip {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 24px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 32px 48px;
  justify-content: space-between;
  color: var(--text-muted);
}
.credstrip span { white-space: nowrap; }

/* ---------- Metric / stat blocks ---------- */
.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
@media (max-width: 760px) { .metrics { grid-template-columns: 1fr; } }
.metric {
  padding: 28px 0;
  border-top: 1px solid var(--rule);
}
.metric__num {
  font-family: var(--ff-serif);
  font-size: 56px;
  line-height: 1;
  letter-spacing: -0.02em;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 12px;
}
.metric__label {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.5;
}

/* ---------- Card ---------- */
.card {
  border: 1px solid var(--rule);
  background: #fff;
  padding: 32px;
  transition: background 160ms ease, border-color 160ms ease;
}
.card:hover {
  background: var(--surface-low);
  border-color: #D9D9D3;
}
.card__eyebrow {
  color: var(--accent);
  margin-bottom: 12px;
}
.card__title {
  margin-bottom: 8px;
}
.card__meta {
  color: var(--text-faint);
  margin-bottom: 16px;
}
.card__body { color: var(--text-muted); }
.card__footer {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* ---------- Grid helpers ---------- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--component-gap); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--component-gap); }
@media (max-width: 760px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 24px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: var(--r-md);
  transition: opacity 160ms ease, background 160ms ease, color 160ms ease, border-color 160ms ease;
  white-space: nowrap;
}
.btn--primary {
  background: var(--text);
  color: var(--bg);
  border: 1px solid var(--text);
}
.btn--primary:hover { opacity: 0.9; color: var(--bg); }
.btn--ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--text);
}
.btn--ghost:hover { background: var(--text); color: var(--bg); }
.btn--accent {
  background: var(--accent);
  color: #fff;
  border: 1px solid var(--accent);
}
.btn--accent:hover { opacity: 0.92; color: #fff; }

/* ---------- Tags / pills ---------- */
.tag {
  display: inline-block;
  padding: 4px 10px;
  border-radius: var(--r-sm);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.04em;
  background: rgba(26, 43, 66, 0.06);
  color: var(--accent);
  border: 1px solid var(--accent-rule);
}
.chip-active {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

/* ---------- Dark closing band ---------- */
.band-dark {
  background: var(--inverse);
  color: var(--inverse-text);
  padding: 56px 0;
  margin-top: var(--section-gap);
}
.band-dark h2 {
  color: var(--inverse-text);
  margin-bottom: 16px;
}
.band-dark p { color: rgba(250, 250, 247, 0.78); }

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--rule);
  margin-top: var(--section-gap);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
  padding: 40px 0;
}
.footer-inner p,
.footer-inner a {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}
.footer-links a:hover { color: var(--text); }

/* ---------- Experience / timeline rows ---------- */
.timeline-row {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 40px;
  padding: 40px 0;
  border-top: 1px solid var(--rule);
}
.timeline-row:last-child { border-bottom: 1px solid var(--rule); }
@media (max-width: 760px) {
  .timeline-row { grid-template-columns: 1fr; gap: 12px; }
}
.timeline-row__meta {
  color: var(--text-faint);
  font-size: 12px;
  line-height: 1.5;
}
.timeline-row__meta .period {
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text);
  margin-bottom: 6px;
  display: block;
  text-transform: uppercase;
  font-size: 11px;
}

/* ---------- Essay list ---------- */
.essay-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 48px;
  padding: 32px 8px;
  margin: 0 -8px;
  border-bottom: 1px solid var(--rule);
  cursor: pointer;
  transition: background 160ms ease;
}
.essay-row:hover { background: var(--surface-low); }
.essay-row__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
  color: var(--text-faint);
}
.essay-row__meta .dot {
  width: 4px; height: 4px;
  background: var(--text-faint);
  border-radius: 999px;
}
.essay-row__arrow {
  color: var(--text-faint);
  transition: color 160ms ease, transform 160ms ease;
}
.essay-row:hover .essay-row__arrow {
  color: var(--accent);
  transform: translateX(4px);
}
@media (max-width: 760px) {
  .essay-row { flex-direction: column; gap: 8px; }
  .essay-row__arrow { display: none; }
}

/* ---------- Research paper blocks ---------- */
.paper {
  padding: 48px 0;
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.paper:last-child { border-bottom: 1px solid var(--rule); }
.paper__venue {
  color: var(--accent);
  margin-bottom: 4px;
}
.paper__title { margin-bottom: 8px; }
.paper__authors {
  color: var(--text-faint);
  font-size: 14px;
  margin-bottom: 16px;
}
.paper__authors strong { color: var(--text); font-weight: 600; }
.paper__abstract { color: var(--text-muted); margin-bottom: 16px; }
.paper__metrics {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  color: var(--text-faint);
  font-size: 13px;
}
.paper__metrics strong { color: var(--text); font-weight: 600; }
.paper__links { display: flex; gap: 20px; flex-wrap: wrap; }
.paper__links a {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}
.paper__links a:hover { border-bottom-color: var(--accent); }

/* ---------- Product preview / AS ---------- */
.product-preview {
  background: var(--surface-low);
  border: 1px solid var(--rule);
  aspect-ratio: 4 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-faint);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-align: center;
  padding: 16px;
}

/* ---------- Contact intent cards ---------- */
.intent-card {
  border: 1px solid var(--rule);
  background: #fff;
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 320px;
  transition: background 160ms ease;
}
.intent-card:hover { background: var(--surface-low); }
.intent-card__eyebrow { color: var(--accent); margin-bottom: 20px; }

/* ---------- Utility ---------- */
.mt-0 { margin-top: 0 !important; }
.mt-8 { margin-top: 8px; }
.mt-12 { margin-top: 12px; }
.mt-16 { margin-top: 16px; }
.mt-20 { margin-top: 20px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mt-40 { margin-top: 40px; }
.mt-48 { margin-top: 48px; }
.mt-64 { margin-top: 64px; }
.mt-80 { margin-top: 80px; }
.mb-0 { margin-bottom: 0 !important; }
.mb-8 { margin-bottom: 8px; }
.mb-12 { margin-bottom: 12px; }
.mb-16 { margin-bottom: 16px; }
.mb-20 { margin-bottom: 20px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }
.mb-40 { margin-bottom: 40px; }
.mb-48 { margin-bottom: 48px; }
.mb-64 { margin-bottom: 64px; }
.mb-80 { margin-bottom: 80px; }
.text-center { text-align: center; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.gap-24 { gap: 24px; }
.gap-32 { gap: 32px; }
.max-640 { max-width: 640px; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.rule-top { border-top: 1px solid var(--rule); padding-top: 40px; }