/* =========================================================
   Fabian Fuentes-Rivas — Deep Field
   Astronomical dark aesthetic: constellations, clusters,
   distant stars. Sober, minimalist, professional.
   ========================================================= */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg:             #0b0e17;
  --bg-elev:        #121624;
  --bg-soft:        #1a1f30;
  --fg:             #e8eaf2;
  --fg-muted:       #9ea4b8;
  --fg-subtle:      #5b627a;
  --accent:         #d97757;
  --accent-dim:     #c86643;
  --accent-soft:    rgba(217, 119, 87, 0.14);
  --accent-warm:    #e8c477;
  --border:         #232838;
  --border-strong:  #383f55;

  --star-core:      #ffffff;
  --star-blue:      #cfdcff;
  --star-gold:      #ffe9b8;

  --font-serif: "Fraunces", "Times New Roman", Georgia, serif;
  --font-sans:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --font-mono:  "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --radius: 4px;
  --radius-lg: 12px;
  --container: 1280px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --section-y: clamp(5rem, 12vw, 10rem);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 0.6s;
}

/* =========================================================
   Base
   ========================================================= */

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

::selection { background: var(--accent); color: var(--bg); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

/* =========================================================
   Starfield canvas — fixed behind all content
   ========================================================= */

.starfield {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  /* A subtle deep-field gradient so the edges feel like looking
     toward the galactic plane rather than a flat black. */
  background:
    radial-gradient(ellipse at 20% 10%, rgba(217, 119, 87, 0.06), transparent 55%),
    radial-gradient(ellipse at 80% 90%, rgba(232, 196, 119, 0.04), transparent 60%),
    var(--bg);
}

/* Keep everything above the starfield. */
.nav,
.nav__menu,
main,
.footer { position: relative; z-index: 2; }

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.035;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}

/* =========================================================
   Layout primitives
   ========================================================= */

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 var(--gutter); }
section { padding: var(--section-y) 0; position: relative; }

.section-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-bottom: clamp(2.5rem, 5vw, 4.5rem);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-subtle);
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
}
.eyebrow::before {
  content: "";
  width: 2rem;
  height: 1px;
  background: var(--border-strong);
}

/* Greek letter (Bayer designation) prefix shown before section numbers.
   Puts a little wink to star catalogs without breaking skimmability. */
.eyebrow__glyph {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.95rem;
  color: var(--accent);
  text-transform: none;
  letter-spacing: 0;
  margin-right: 0.1rem;
  display: inline-block;
  transform: translateY(1px);
}

.section-title {
  font-family: var(--font-serif);
  font-weight: 300;
  font-optical-sizing: auto;
  font-variation-settings: "SOFT" 50;
  font-size: clamp(2.25rem, 5vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--fg);
  max-width: 18ch;
}
.section-title em { font-style: italic; color: var(--accent); }

/* =========================================================
   Navigation
   ========================================================= */

.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  padding: 1.25rem 0;
  background: transparent;
  transition: background var(--dur) var(--ease), padding var(--dur) var(--ease), border-color var(--dur) var(--ease);
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: rgba(20, 20, 19, 0.82);
  backdrop-filter: saturate(140%) blur(16px);
  -webkit-backdrop-filter: saturate(140%) blur(16px);
  border-bottom-color: var(--border);
  padding: 0.85rem 0;
}
.nav__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.nav__brand {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--fg);
  display: inline-flex;
  align-items: baseline;
  gap: 0.55rem;
}
.nav__brand-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
  transform: translateY(-1px);
  box-shadow: 0 0 8px rgba(217, 119, 87, 0.55);
  animation: starTwinkle 5s ease-in-out infinite;
}
.nav__links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}
.nav__link {
  font-size: 0.9375rem;
  color: var(--fg-muted);
  position: relative;
  padding: 0.25rem 0;
  transition: color 0.3s var(--ease);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 100%; height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
}
.nav__link:hover { color: var(--fg); }
.nav__link:hover::after { transform: scaleX(1); }

.nav__cta {
  font-size: 0.875rem;
  padding: 0.55rem 1rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  color: var(--fg);
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease), color 0.3s var(--ease);
}
.nav__cta:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
}

.nav__menu { display: none; }

.nav__toggle {
  display: none;
  width: 44px; height: 44px;
  align-items: center;
  justify-content: center;
  position: relative;
}
.nav__toggle span,
.nav__toggle span::before,
.nav__toggle span::after {
  content: "";
  display: block;
  width: 22px; height: 1.5px;
  background: var(--fg);
  transition: transform 0.35s var(--ease), top 0.35s var(--ease);
}
.nav__toggle span::before,
.nav__toggle span::after {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}
.nav__toggle span::before { top: 15px; }
.nav__toggle span::after  { top: 27px; }
.nav__toggle span         { background: transparent; position: relative; top: 0; }
.nav__toggle[aria-expanded="true"] span::before {
  top: 21px;
  transform: translateX(-50%) rotate(45deg);
}
.nav__toggle[aria-expanded="true"] span::after {
  top: 21px;
  transform: translateX(-50%) rotate(-45deg);
}

/* =========================================================
   Hero
   ========================================================= */

.hero {
  min-height: 100vh;
  display: grid;
  align-content: end;
  padding-top: 9rem;
  padding-bottom: clamp(3rem, 8vw, 6rem);
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 50% at 85% 15%, rgba(217, 119, 87, 0.10), transparent 70%),
    radial-gradient(40% 40% at 0% 100%, rgba(232, 196, 119, 0.05), transparent 70%);
  pointer-events: none;
  z-index: 0;
}
.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(2rem, 4vw, 3.5rem);
}
.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-subtle);
}
.hero__meta-item { display: inline-flex; align-items: center; gap: 0.55rem; }
.hero__meta-item .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(217, 119, 87, 0.6);
  animation: starTwinkle 4s ease-in-out infinite;
}

@keyframes starTwinkle {
  0%, 100% { opacity: 1; box-shadow: 0 0 8px rgba(217, 119, 87, 0.6); }
  50%      { opacity: 0.55; box-shadow: 0 0 4px rgba(217, 119, 87, 0.3); }
}

/* Constellation decoration — small SVG overlay next to hero */
.constellation {
  position: absolute;
  pointer-events: none;
  color: var(--accent);
}

.constellation--hero {
  top: 10%;
  right: 5%;
  width: clamp(100px, 13vw, 170px);
  opacity: 0.5;
  display: none;
}

@media (min-width: 900px) {
  .constellation--hero { display: block; }
}

.constellation svg {
  width: 100%;
  height: auto;
  display: block;
}

.constellation .c-line {
  stroke: var(--accent);
  stroke-width: 0.6;
  fill: none;
  opacity: 0.45;
  stroke-dasharray: 400;
  stroke-dashoffset: 400;
  animation: constellationDraw 2.4s var(--ease) 0.6s forwards;
}

.constellation .c-star {
  fill: var(--star-core);
  animation: starTwinkle 5s ease-in-out infinite;
}

.constellation .c-star--bright {
  fill: var(--accent);
  filter: drop-shadow(0 0 3px rgba(217, 119, 87, 0.8));
}

.constellation .c-star:nth-child(3n)  { animation-delay: 0.3s; animation-duration: 6s; }
.constellation .c-star:nth-child(3n+1){ animation-delay: 1.1s; animation-duration: 4.5s; }
.constellation .c-star:nth-child(3n+2){ animation-delay: 1.8s; animation-duration: 7s; }

@keyframes constellationDraw {
  to { stroke-dashoffset: 0; }
}

.hero__title {
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: clamp(3rem, 10vw, 8.5rem);
  line-height: 0.92;
  letter-spacing: -0.035em;
  color: var(--fg);
  font-variation-settings: "SOFT" 100;
}
.hero__title .line { display: block; }
.hero__title .line--italic {
  font-style: italic;
  color: var(--accent);
}

.hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 4vw, 3rem);
  align-items: end;
}

.hero__lede {
  font-size: clamp(1.0625rem, 1.4vw, 1.25rem);
  line-height: 1.55;
  color: var(--fg-muted);
  max-width: 38ch;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  margin-top: 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.95rem 1.5rem;
  border-radius: 999px;
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: background 0.3s var(--ease), color 0.3s var(--ease), border-color 0.3s var(--ease), transform 0.3s var(--ease);
  border: 1px solid transparent;
}
.btn--primary { background: var(--accent); color: var(--bg); }
.btn--primary:hover { background: var(--accent-dim); transform: translateY(-1px); }
.btn--ghost { border-color: var(--border-strong); color: var(--fg); }
.btn--ghost:hover { border-color: var(--fg-muted); background: var(--bg-elev); }
.btn .arrow { transition: transform 0.3s var(--ease); }
.btn:hover .arrow { transform: translateX(3px); }

.hero__portrait {
  position: relative;
  aspect-ratio: 1 / 1;
  max-width: 420px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-elev);
  box-shadow:
    0 30px 60px -20px rgba(0, 0, 0, 0.7),
    0 0 0 1px rgba(217, 119, 87, 0.08),
    inset 0 0 40px rgba(11, 14, 23, 0.35);
  justify-self: end;
}
.hero__portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(15%) contrast(1.03);
  transition: filter 0.6s var(--ease), transform 0.8s var(--ease);
}
.hero__portrait:hover img {
  filter: grayscale(0%) contrast(1.03);
  transform: scale(1.02);
}
.hero__portrait::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at center, transparent 55%, rgba(11, 14, 23, 0.55) 100%),
    linear-gradient(180deg, transparent 60%, rgba(11, 14, 23, 0.5) 100%);
  pointer-events: none;
}

.hero__scroll {
  margin-top: clamp(2.5rem, 5vw, 4rem);
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-subtle);
}
.hero__scroll-line {
  display: inline-block;
  width: 2.5rem;
  height: 1px;
  background: var(--border-strong);
  position: relative;
  overflow: hidden;
}
.hero__scroll-line::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--accent);
  transform: translateX(-100%);
  animation: scrollLine 2.6s var(--ease) infinite;
}
@keyframes scrollLine {
  0%   { transform: translateX(-100%); }
  60%  { transform: translateX(0%); }
  100% { transform: translateX(100%); }
}

/* =========================================================
   About
   ========================================================= */

.about__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 3vw, 3rem);
}
.about__text p + p { margin-top: 1.25rem; }
.about__text p {
  font-size: clamp(1.0625rem, 1.3vw, 1.25rem);
  line-height: 1.65;
  color: var(--fg-muted);
  max-width: 62ch;
}
.about__text strong { color: var(--fg); font-weight: 500; }

.about__meta {
  display: grid;
  gap: 1.25rem;
  padding: 1.75rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  align-self: start;
}
.about__meta-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.35rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}
.about__meta-row:last-child { padding-bottom: 0; border-bottom: 0; }
.about__meta-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-subtle);
}
.about__meta-value { color: var(--fg); font-size: 1rem; }

/* =========================================================
   Timeline (Experience / Education)
   ========================================================= */

.timeline {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--border);
}
.timeline__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem 2rem;
  padding: clamp(1.75rem, 3vw, 2.5rem) 0;
  border-bottom: 1px solid var(--border);
  transition: background 0.4s var(--ease);
}
.timeline__item:hover {
  background: linear-gradient(90deg, var(--bg-elev), transparent 80%);
}
.timeline__year {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--fg-subtle);
  padding-top: 0.35rem;
}
.timeline__body h3 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--fg);
  margin-bottom: 0.4rem;
}
.timeline__company {
  font-size: 0.9375rem;
  color: var(--accent);
  margin-bottom: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}
.timeline__company::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
}
.timeline__desc { color: var(--fg-muted); max-width: 62ch; font-size: 1rem; }

/* =========================================================
   Skills
   ========================================================= */

.skills {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.skill {
  padding: 2rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: border-color 0.4s var(--ease), transform 0.4s var(--ease);
  position: relative;
  overflow: hidden;
}
.skill::before {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s var(--ease);
}
.skill:hover { border-color: var(--border-strong); transform: translateY(-2px); }
.skill:hover::before { transform: scaleX(1); }

.skill__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--fg-subtle);
  margin-bottom: 1rem;
  display: block;
}
.skill__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 1.5rem;
  letter-spacing: -0.01em;
  margin-bottom: 1.25rem;
  color: var(--fg);
}
.skill__tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 0.85rem;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--fg-muted);
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease);
}
.skill:hover .tag { color: var(--fg); border-color: var(--border-strong); }

/* =========================================================
   Projects
   ========================================================= */

.projects {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
.project {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  padding: clamp(1.75rem, 3vw, 2.5rem);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: border-color 0.4s var(--ease), transform 0.4s var(--ease);
  position: relative;
  overflow: hidden;
}
.project:hover { border-color: var(--border-strong); transform: translateY(-2px); }
.project__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--fg-subtle);
}
.project__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(1.5rem, 2.2vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--fg);
}
.project__desc { color: var(--fg-muted); max-width: 62ch; }
.project__stack { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.5rem; }

/* =========================================================
   Certifications / Continuing Education
   ========================================================= */

.cert-list {
  list-style: none;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--border);
}

.cert {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem 2rem;
  padding: clamp(1.25rem, 2.5vw, 1.75rem) 0;
  border-bottom: 1px solid var(--border);
  transition: background 0.4s var(--ease);
}

.cert:hover {
  background: linear-gradient(90deg, var(--bg-elev), transparent 80%);
}

.cert__year {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--fg-subtle);
  padding-top: 0.2rem;
}

.cert__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(1.1rem, 1.6vw, 1.35rem);
  line-height: 1.25;
  letter-spacing: -0.005em;
  color: var(--fg);
  margin-bottom: 0.35rem;
}

.cert__org {
  font-size: 0.9375rem;
  color: var(--accent);
}

@media (min-width: 900px) {
  .cert {
    grid-template-columns: 8rem 1fr;
    gap: 3rem;
  }
}

/* =========================================================
   Publications
   ========================================================= */

.publications {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--border);
}
.publication {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  padding: clamp(1.75rem, 3vw, 2.5rem) 0;
  border-bottom: 1px solid var(--border);
  transition: background 0.4s var(--ease);
}
.publication:hover { background: linear-gradient(90deg, var(--bg-elev), transparent 80%); }
.publication__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--fg-subtle);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.publication__type {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.6rem;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  width: fit-content;
}

.publication__year {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--fg-subtle);
}
.publication__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(1.35rem, 2vw, 1.75rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--fg);
  max-width: 38ch;
}
.publication__journal {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--fg-subtle);
  text-transform: uppercase;
}
.publication__desc { color: var(--fg-muted); max-width: 62ch; }
.publication__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--accent);
  font-size: 0.9375rem;
  margin-top: 0.25rem;
  position: relative;
  width: fit-content;
}
.publication__link::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 100%; height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
}
.publication__link:hover::after { transform: scaleX(1); }

/* =========================================================
   Contact
   ========================================================= */

.contact { padding-bottom: clamp(4rem, 10vw, 8rem); }
.contact__headline {
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: clamp(2.5rem, 7vw, 6rem);
  line-height: 0.98;
  letter-spacing: -0.03em;
  color: var(--fg);
  max-width: 14ch;
  margin-bottom: 2.5rem;
}
.contact__headline em { font-style: italic; color: var(--accent); }
.contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  margin-bottom: 3.5rem;
}
.contact__details {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}
.contact__detail .label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-subtle);
  display: block;
  margin-bottom: 0.5rem;
}
.contact__detail .value { color: var(--fg); font-size: 1rem; position: relative; }
.contact__detail a.value::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 100%; height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease);
}
.contact__detail a.value:hover::after { transform: scaleX(1); }

/* =========================================================
   Footer
   ========================================================= */

.footer { border-top: 1px solid var(--border); padding: 3rem 0 2.5rem; }
.footer__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: center;
}
.footer__brand { font-family: var(--font-serif); font-size: 1rem; color: var(--fg); }
.footer__meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--fg-subtle);
}

/* =========================================================
   Reveal animation
   ========================================================= */

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
[data-reveal].is-revealed { opacity: 1; transform: translateY(0); }

/* =========================================================
   Responsive
   ========================================================= */

@media (min-width: 640px) {
  .about__meta-row {
    grid-template-columns: 6rem 1fr;
    gap: 1.5rem;
    align-items: baseline;
  }
  .contact__details { grid-template-columns: repeat(2, 1fr); gap: 2.5rem; }
  .skills { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 900px) {
  .hero__grid { grid-template-columns: 1.1fr 0.9fr; gap: clamp(3rem, 6vw, 6rem); }
  .about__grid { grid-template-columns: 1.6fr 1fr; gap: clamp(3rem, 6vw, 5rem); }
  .timeline__item {
    grid-template-columns: 8rem 1fr;
    gap: 3rem;
    padding: clamp(2rem, 3vw, 2.75rem) 0;
  }
  .publication {
    grid-template-columns: 8rem 1fr;
    gap: 3rem;
    align-items: start;
  }
  .publication__num { padding-top: 0.35rem; }
  .projects { grid-template-columns: repeat(2, 1fr); }
  .contact__details { grid-template-columns: repeat(4, 1fr); }
  .footer__row { grid-template-columns: auto 1fr auto; gap: 3rem; }
}

@media (min-width: 1100px) {
  .section-head {
    grid-template-columns: 14rem 1fr;
    gap: 3rem;
    align-items: baseline;
  }
}

/* Mobile nav */
@media (max-width: 899px) {
  .nav__links,
  .nav__cta { display: none; }
  .nav__toggle { display: inline-flex; z-index: 60; }
  .nav__menu {
    display: flex;
    position: fixed;
    inset: 0;
    background: var(--bg);
    padding: 6rem 2rem 3rem;
    transform: translateY(-100%);
    transition: transform 0.5s var(--ease);
    display: flex;
    flex-direction: column;
    gap: 0;
    z-index: 40;
    border-bottom: 1px solid var(--border);
  }
  .nav__menu.is-open { transform: translateY(0); }
  .nav__menu .nav__link {
    font-family: var(--font-serif);
    font-size: clamp(1.75rem, 6vw, 2.5rem);
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--border);
    color: var(--fg);
  }
  .nav__menu .nav__link::after { display: none; }
  .nav__menu .nav__cta {
    display: inline-flex;
    margin-top: 2rem;
    width: fit-content;
  }
  body.nav-open { overflow: hidden; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
}