/* ============================================================
   Karine Ferreira — Portfolio
   Design tokens per DESIGN.md — warm terracotta, editorial serif
   ============================================================ */

:root {
  /* Color */
  --color-bg: oklch(1 0 0);
  --color-surface: oklch(0.97 0.014 50);
  --color-line: oklch(0.88 0.016 50);

  --color-ink: oklch(0.24 0.02 50);
  --color-muted: oklch(0.46 0.03 50);

  --color-primary: oklch(0.42 0.12 50);
  --color-primary-deep: oklch(0.28 0.09 45);
  --color-primary-ink: oklch(0.97 0.01 60);

  --color-accent: oklch(0.86 0.11 85);

  /* Type */
  --font-display: 'Piazzolla', ui-serif, Georgia, serif;
  --font-body: 'Figtree', ui-sans-serif, system-ui, sans-serif;

  /* Spacing (8px base) */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-6: 1.5rem;
  --sp-8: 2rem;
  --sp-12: 3rem;
  --sp-16: 4rem;
  --sp-24: 6rem;
  --sp-32: 8rem;
  --sp-40: 10rem;

  --measure: 68ch;
  --shell: 1200px;

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);

  /* z-scale */
  --z-nav: 100;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3 { font-family: var(--font-display); margin: 0; font-weight: 600; }
p { margin: 0; }
ul, ol, dl { margin: 0; padding: 0; list-style: none; }
button { font: inherit; }

.text-balance { text-wrap: balance; }
.prose {
  max-width: var(--measure);
  text-wrap: pretty;
  color: var(--color-ink);
}
.prose + .prose { margin-top: var(--sp-4); }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: var(--color-primary-ink);
  padding: var(--sp-3) var(--sp-4);
  z-index: 200;
}
.skip-link:focus {
  left: var(--sp-4);
  top: var(--sp-4);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 0.875rem 1.75rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  white-space: nowrap;
  transition: transform 0.35s var(--ease-out-expo), background-color 0.25s ease, box-shadow 0.35s var(--ease-out-expo);
}
.btn--primary {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: 0 1px 2px oklch(0.24 0.02 50 / 0.12);
}
.btn--primary:hover {
  background: var(--color-primary-deep);
  transform: translateY(-2px);
  box-shadow: 0 10px 24px oklch(0.24 0.02 50 / 0.18);
}
.btn--ghost {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}
.btn--ghost:hover {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  transform: translateY(-2px);
}
.btn--ghost-dark {
  color: var(--color-primary-ink);
  border-color: oklch(0.97 0.01 60 / 0.55);
}
.btn--ghost-dark:hover {
  background: var(--color-primary-ink);
  color: var(--color-primary-deep);
}
.btn--linkedin {
  background: var(--color-primary-deep);
  color: var(--color-primary-ink);
  box-shadow: 0 1px 2px oklch(0.24 0.02 50 / 0.12);
}
.btn--linkedin:hover {
  background: oklch(0.22 0.07 45);
  transform: translateY(-2px);
  box-shadow: 0 10px 24px oklch(0.24 0.02 50 / 0.18);
}
.btn__icon { flex-shrink: 0; }
@media (prefers-reduced-motion: reduce) {
  .btn { transition: background-color 0.2s ease; }
  .btn:hover { transform: none; }
}

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background: oklch(1 0 0 / 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.nav.is-scrolled {
  border-bottom-color: var(--color-line);
  box-shadow: 0 4px 20px oklch(0.24 0.02 50 / 0.05);
}
.nav__inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: var(--sp-4) var(--sp-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  text-decoration: none;
  color: var(--color-ink);
}
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--sp-8);
}
.nav__links a {
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-muted);
  transition: color 0.2s ease;
}
.nav__links a:hover { color: var(--color-ink); }
.nav__cta {
  background: var(--color-primary);
  color: var(--color-primary-ink) !important;
  padding: 0.55rem 1.25rem;
  border-radius: 999px;
}
.nav__cta:hover { background: var(--color-primary-deep); }
.nav__cta--mobile {
  display: none;
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.6rem 1rem;
  min-height: 44px;
  align-items: center;
}
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  padding: var(--sp-2);
  cursor: pointer;
}
.nav__toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-ink);
  transition: transform 0.25s var(--ease-out-expo), opacity 0.2s ease;
}
.nav__mobile {
  display: none;
  flex-direction: column;
  padding: var(--sp-2) var(--sp-6) var(--sp-6);
  gap: var(--sp-1);
}
.nav__mobile a {
  text-decoration: none;
  color: var(--color-ink);
  padding: var(--sp-3) 0;
  border-bottom: 1px solid var(--color-line);
  font-weight: 500;
}
.nav__mobile .nav__cta {
  text-align: center;
  border-bottom: none;
  margin-top: var(--sp-2);
}

@media (max-width: 860px) {
  .nav__links { display: none; }
  .nav__cta--mobile { display: inline-flex; }
  .nav__toggle { display: flex; }
  .nav.is-open .nav__mobile { display: flex; }
  .nav.is-open .nav__toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav.is-open .nav__toggle span:nth-child(2) { opacity: 0; }
  .nav.is-open .nav__toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

/* ---------- Hero ---------- */
.hero {
  padding: var(--sp-16) var(--sp-6) var(--sp-24);
  background:
    radial-gradient(120% 100% at 100% 0%, oklch(0.97 0.014 50) 0%, var(--color-bg) 55%);
}
.hero__inner {
  max-width: var(--shell);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--sp-24);
  align-items: center;
}
.hero__kicker {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-primary);
  margin: 0 0 var(--sp-4);
}
.hero__title {
  font-size: clamp(2.75rem, 5vw + 1rem, 4.5rem);
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin-bottom: var(--sp-4);
}
.hero__tagline {
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--color-primary-deep);
  max-width: 42ch;
  line-height: 1.5;
  margin-bottom: var(--sp-6);
}
.hero__lead {
  font-size: 1.05rem;
  color: var(--color-muted);
  max-width: 52ch;
  line-height: 1.65;
  margin-bottom: var(--sp-4);
}
.hero__institutions {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1rem;
  color: var(--color-primary-deep);
  margin-bottom: var(--sp-8);
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-4);
}
.hero__figure { position: relative; }
.hero__photo-frame {
  position: relative;
  border-radius: 18px;
  overflow: hidden;
  aspect-ratio: 3 / 4;
  background: var(--color-primary);
  box-shadow: 0 30px 60px -20px oklch(0.24 0.02 50 / 0.35);
}
.hero__photo-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
}

@media (max-width: 960px) {
  .hero__inner { grid-template-columns: 1fr; gap: var(--sp-12); }
  .hero__figure { max-width: 380px; margin: 0 auto; order: -1; }
}

/* ---------- Sections (shared) ---------- */
.section { padding: var(--sp-24) var(--sp-6); }
.section--surface { background: var(--color-surface); }
.section__inner { max-width: var(--shell); margin: 0 auto; }
.section__inner--split {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: var(--sp-16);
}
.section__title {
  font-size: clamp(1.75rem, 2.5vw + 1rem, 2.5rem);
  letter-spacing: -0.01em;
  margin-bottom: var(--sp-2);
}
.section__subtitle {
  color: var(--color-muted);
  font-size: 1.05rem;
  max-width: 46ch;
}

@media (max-width: 860px) {
  .section__inner--split { grid-template-columns: 1fr; gap: var(--sp-6); }
}

/* ---------- Trajectory (timeline + photos) ---------- */
.trajectory {
  margin-top: var(--sp-12);
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--sp-16);
  align-items: start;
}
.trajectory__photos {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-4);
}
.trajectory__photo {
  position: relative;
  margin: 0;
  border-radius: 14px;
  overflow: hidden;
  aspect-ratio: 3 / 4;
  background: var(--color-line);
}
.trajectory__photo img { width: 100%; height: 100%; object-fit: cover; }
.trajectory__photo--sm { margin-top: var(--sp-12); }
.trajectory__photo figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--sp-6) var(--sp-3) var(--sp-2);
  font-size: 0.75rem;
  line-height: 1.3;
  color: oklch(0.97 0.01 60);
  background: linear-gradient(to top, oklch(0.1 0.02 50 / 0.85) 0%, transparent 100%);
}

@media (max-width: 860px) {
  .trajectory { grid-template-columns: 1fr; gap: var(--sp-8); }
  .trajectory__photo--sm { margin-top: 0; }
}
@media (max-width: 480px) {
  .trajectory__photos { grid-template-columns: 1fr 1fr; }
}

/* ---------- Timeline ---------- */
.timeline {
  position: relative;
  max-width: var(--measure);
  margin-top: 0;
  padding-left: var(--sp-8);
  border-left: 2px solid var(--color-line);
}
.timeline__item { position: relative; padding-bottom: var(--sp-12); }
.timeline__item:last-child { padding-bottom: 0; }
.timeline__marker {
  position: absolute;
  left: calc(-1 * var(--sp-8) - 6px);
  top: 0.4rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-bg);
}
.section--surface .timeline__marker { box-shadow: 0 0 0 4px var(--color-surface); }
.timeline__period {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: var(--sp-1);
}
.timeline__role {
  font-size: 1.35rem;
  margin-bottom: var(--sp-1);
}
.timeline__org { color: var(--color-muted); }

/* ---------- Education list ---------- */
.edu-list { margin-bottom: var(--sp-12); }
.edu-list__row {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: var(--sp-4);
  padding: var(--sp-4) 0;
  border-top: 1px solid var(--color-line);
}
.edu-list__row:last-child { border-bottom: 1px solid var(--color-line); }
.edu-list__row dt {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-primary);
  padding-top: 0.1rem;
}
.edu-list__row dd { margin: 0; color: var(--color-ink); }
.edu-list__subhead {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--color-primary-deep);
  margin: var(--sp-12) 0 var(--sp-4);
}
.edu-list__subhead--first { margin-top: 0; }

@media (max-width: 560px) {
  .edu-list__row { grid-template-columns: 1fr; gap: var(--sp-1); }
}

/* ---------- Tag list ---------- */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
}
.tag-list li {
  padding: var(--sp-2) var(--sp-4);
  border-radius: 999px;
  border: 1px solid var(--color-line);
  background: var(--color-bg);
  font-size: 0.9rem;
  color: var(--color-ink);
}
.section--surface .tag-list li { background: var(--color-bg); }

/* ---------- Awards / dark section ---------- */
.section--dark {
  background: linear-gradient(160deg, var(--color-primary-deep) 0%, var(--color-primary) 100%);
  color: var(--color-primary-ink);
}
.section__title--on-dark { color: var(--color-primary-ink); }
.section__subtitle--on-dark { color: oklch(0.97 0.01 60 / 0.78); }

.awards {
  margin-top: var(--sp-12);
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: var(--sp-16);
  align-items: center;
}
.awards__photo {
  position: relative;
  margin: 0;
  border-radius: 14px;
  overflow: hidden;
  background: oklch(0.97 0.01 60 / 0.08);
  aspect-ratio: 4 / 5;
  max-width: 420px;
}
.awards__photo img { width: 100%; height: 100%; object-fit: cover; }
.awards__photo figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--sp-8) var(--sp-4) var(--sp-3);
  font-size: 0.85rem;
  color: oklch(0.97 0.01 60);
  background: linear-gradient(to top, oklch(0.1 0.02 50 / 0.9) 0%, oklch(0.1 0.02 50 / 0.6) 60%, transparent 100%);
}

.awards__list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  max-width: var(--measure);
}
.awards__list li {
  padding-left: var(--sp-6);
  position: relative;
  font-size: 1.1rem;
  color: oklch(0.97 0.01 60 / 0.92);
}
.awards__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-accent);
}

@media (max-width: 760px) {
  .awards { grid-template-columns: 1fr; gap: var(--sp-8); }
  .awards__photo { max-width: 320px; margin: 0 auto; }
}

/* ---------- Projects ---------- */
.projects {
  margin-top: var(--sp-12);
  display: flex;
  flex-direction: column;
}
.project {
  padding: var(--sp-8) 0;
  border-top: 1px solid var(--color-line);
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: var(--sp-8);
}
.project:last-child { border-bottom: 1px solid var(--color-line); }
.project h3 {
  font-size: 1.4rem;
  color: var(--color-primary-deep);
}

@media (max-width: 700px) {
  .project { grid-template-columns: 1fr; gap: var(--sp-2); }
}

/* ---------- CTA ---------- */
.cta {
  background: var(--color-surface);
  padding: var(--sp-32) var(--sp-6);
  text-align: center;
}
.cta__inner { max-width: 760px; margin: 0 auto; }
.cta__title {
  font-size: clamp(1.9rem, 3vw + 1rem, 3rem);
  letter-spacing: -0.015em;
  margin-bottom: var(--sp-4);
}
.cta__lead {
  color: var(--color-muted);
  font-size: 1.1rem;
  max-width: 52ch;
  margin: 0 auto var(--sp-8);
}
.cta__actions { justify-content: center; }
.cta__fallback {
  margin-top: var(--sp-6);
  font-size: 0.9rem;
  color: var(--color-muted);
}

/* ---------- Footer ---------- */
.footer {
  padding: var(--sp-8) var(--sp-6);
  text-align: center;
  color: var(--color-muted);
  font-size: 0.85rem;
}

/* ---------- Scroll reveal ---------- */
.reveal {
  opacity: 1;
  transform: none;
}
.js-reveal-ready .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease-out-expo), transform 0.7s var(--ease-out-expo);
}
.js-reveal-ready .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .js-reveal-ready .reveal {
    transition: opacity 0.3s ease;
    transform: none;
  }
}