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

:root {
  --bg: #0b0b0b;
  --bg2: #111111;
  --bg3: #161616;
  --border: rgba(255,255,255,0.08);
  --border-hover: rgba(255,255,255,0.18);
  --accent: #c8ff47;
  --accent-dim: rgba(200,255,71,0.12);
  --text: #f0ede8;
  --text-muted: #7a7770;
  --text-dim: #3f3d3b;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Syne', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
}

/* subtle global transitions for interactive feel */
* {
  transition: color 0.18s ease, background-color 0.22s ease, transform 0.18s ease, opacity 0.18s ease;
}

/* NOISE TEXTURE OVERLAY */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 999;
  opacity: 0.6;
}

/* NAV */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 3rem;
  background: rgba(11,11,11,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.04em;
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--text); }

/* Language switch (ES / EN) styling */
.lang-switch {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-left: 1rem;
}
.lang-switch a {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.3rem 0.6rem;
  border-radius: 4px;
  border: 1px solid transparent;
  transition: all 0.18s ease;
}
.lang-switch a:visited { color: inherit; }
.lang-switch a:hover {
  color: var(--text);
  background: rgba(255,255,255,0.02);
  border-color: var(--border-hover);
}
.lang-switch a.active {
  color: var(--accent);
  background: var(--accent-dim);
  border-color: var(--accent);
}

/* HERO */
#home {
  min-height: 100vh;
  display: grid;
  grid-template-rows: 1fr auto;
  padding: 0 3rem;
  padding-top: 80px;
  position: relative;
  overflow: hidden;
}

/* Animated hero background container (tsParticles will inject canvas) */
#hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* ensure content sits above animated background */
.hero-content, .hero-footer { position: relative; z-index: 1; }

.hero-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 4rem 0;
  max-width: 900px;
}

.hero-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Make hero text non-selectable so mouse interactions feel like a game */
.hero-content, .hero-tag, .hero-name, .hero-name .line2 {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.hero-tag::before {
  content: '';
  display: block;
  width: 24px;
  height: 1px;
  background: var(--accent);
}

.hero-name {
  font-family: 'Syne', sans-serif;
  font-size: clamp(3.5rem, 9vw, 8rem);
  font-weight: 800;
  line-height: 0.9;
  letter-spacing: -0.03em;
  margin-bottom: 2rem;
}

.hero-name .line2 {
  color: transparent;
  -webkit-text-stroke: 1px rgba(240,237,232,0.25);
}

.hero-roles {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
}

.role-tag {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.4rem 1rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-muted);
  transition: all 0.2s;
}

.role-tag:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.role-tag.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 480px;
  line-height: 1.7;
  margin-bottom: 3rem;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  font-family: 'Syne', sans-serif;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: 4px;
  transition: all 0.25s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #0b0b0b;
}

.btn-primary:hover {
  background: #d4ff60;
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  border-color: var(--border-hover);
  background: rgba(255,255,255,0.04);
}

.hero-bg-text {
  position: absolute;
  right: -2rem;
  top: 50%;
  transform: translateY(-50%) rotate(-90deg);
  transform-origin: center;
  font-size: clamp(8rem, 15vw, 14rem);
  font-weight: 800;
  color: transparent;
  -webkit-text-stroke: 1px var(--text-dim);
  white-space: nowrap;
  pointer-events: none;
  letter-spacing: -0.05em;
  user-select: none;
}

.hero-footer {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding: 2rem 0;
  border-top: 1px solid var(--border);
}

.hero-footer-item {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.hero-footer-item span { color: var(--accent); }

/* SECTION COMMONS */
section {
  padding: 7rem 3rem;
  position: relative;
}

section + section {
  border-top: 1px solid var(--border);
}

.section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.section-label::after {
  content: '';
  flex: 1;
  max-width: 40px;
  height: 1px;
  background: var(--accent);
  opacity: 0.5;
}

.section-title {
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}

/* ABOUT */
#about .about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
  margin-top: 4rem;
}

.about-photo-wrap {
  position: relative;
}

.about-photo-wrap {
  position: relative;
  display: inline-block;
  max-width: 400px;
}

.about-photo-wrap img {
  width: 100%;
  height: auto;
  max-width: 400px;
  filter: grayscale(20%) contrast(1.05);
  display: block;
  border-radius: 2px;
}

.about-photo-accent {
  position: absolute;
  top: -12px;
  left: -12px;
  right: -12px;
  bottom: -12px;
  border: 1px solid var(--accent);
  border-radius: 2px;
  opacity: 0.3;
  pointer-events: none;
}

.about-photo-label {
  position: absolute;
  bottom: -1.5rem;
  right: 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 0.1em;
}

.about-text h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.about-text .subtitle {
  font-family: 'Instrument Serif', serif;
  font-style: italic;
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.about-text p {
  font-size: 0.95rem;
  color: rgba(240,237,232,0.7);
  line-height: 1.85;
  margin-bottom: 1.5rem;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}

.stat-num {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--accent);
  line-height: 1;
}

.stat-label {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* EXPERIENCE TIMELINE */
#experience .exp-list {
  margin-top: 4rem;
  position: relative;
}

.exp-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 3rem;
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
  position: relative;
  transition: background 0.2s;
}

.exp-item::before {
  content: '';
  position: absolute;
  left: -3rem;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--border);
  display: none;
}

.exp-item:hover {
  background: rgba(255,255,255,0.01);
}

.exp-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  padding-top: 0.2rem;
  line-height: 1.6;
}

.exp-current {
  display: inline-block;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  border-radius: 2px;
  margin-top: 0.4rem;
  border: 1px solid rgba(200,255,71,0.3);
}

.exp-body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
}

.exp-org {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.exp-desc {
  font-size: 0.875rem;
  color: rgba(240,237,232,0.55);
  line-height: 1.8;
}

/* EDUCATION */
#congresos .edu-grid,
#conferences .edu-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 3rem;
}

.edu-location {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: rgba(240,237,232,0.38);
  letter-spacing: 0.04em;
  margin-bottom: 0.75rem;
}

#education .edu-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 4rem;
}

.edu-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2rem;
  transition: all 0.25s;
  position: relative;
  overflow: hidden;
}

.edu-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s;
}

.edu-card:hover::before { transform: scaleX(1); }
.edu-card:hover { border-color: var(--border-hover); background: var(--bg3); }

.edu-icon {
  font-size: 1.75rem;
  margin-bottom: 1.25rem;
  display: block;
}

.edu-degree {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 0.4rem;
  line-height: 1.3;
}

.edu-uni {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.edu-desc {
  font-size: 0.8rem;
  color: rgba(240,237,232,0.45);
  line-height: 1.7;
}

/* SKILLS */
#education .skills-layout {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 2rem;
  margin-top: 4rem;
}

.skill-group h4 {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.35rem 0.75rem;
  transition: all 0.2s;
}

.skill-tag:hover {
  color: var(--accent);
  border-color: rgba(200,255,71,0.35);
  background: var(--accent-dim);
}

/* OPEN SOURCE SECTION */
#opensource {
  background: var(--bg2);
}

.opensource-sub {
  margin-top: 4rem;
}

.opensource-sub-title {
  font-size: 0.75rem;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 2rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.github-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}

.github-controls {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  justify-content: center;
  margin-top: 1.5rem;
}

#gh-page-info {
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.85rem;
  min-width: 5rem;
  text-align: center;
}

.npm-intro {
  font-size: 0.95rem;
  color: var(--text-muted);
  max-width: 540px;
  margin-top: 1rem;
  line-height: 1.7;
}

.npm-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}

.npm-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  transition: all 0.25s;
  position: relative;
}

.npm-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

.npm-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 1.5rem 1.75rem 1rem;
  gap: 1rem;
}

.npm-pkg-name {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.npm-pkg-name:hover { text-decoration: underline; }

.npm-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.25rem 0.6rem;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

.npm-desc {
  padding: 0 1.75rem 1.25rem;
  font-size: 0.85rem;
  color: rgba(240,237,232,0.55);
  line-height: 1.7;
}

.npm-install {
  margin: 0 1.75rem 1.5rem;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.7rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.npm-install code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: rgba(240,237,232,0.7);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.npm-install code .prompt {
  color: var(--text-dim);
  user-select: none;
}

.npm-copy-btn {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.25rem 0.6rem;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
  flex-shrink: 0;
}

.npm-copy-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.npm-meta {
  padding: 1rem 1.75rem;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 1.5rem;
}

.npm-meta-item {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.npm-meta-item svg {
  width: 12px;
  height: 12px;
  opacity: 0.5;
}

/* FOOTER */
footer {
  padding: 4rem 3rem;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.footer-brand {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.04em;
}

.footer-copy {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}

.footer-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.footer-links a {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-links a:hover { color: var(--text); }

/* SCROLLBAR */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--text-dim); border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ANIMATIONS */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-tag { animation: fadeUp 0.6s ease both; animation-delay: 0.1s; }
.hero-name { animation: fadeUp 0.7s ease both; animation-delay: 0.2s; }
.hero-roles { animation: fadeUp 0.7s ease both; animation-delay: 0.35s; }
.hero-desc { animation: fadeUp 0.7s ease both; animation-delay: 0.45s; }
.hero-cta { animation: fadeUp 0.7s ease both; animation-delay: 0.55s; }

/* RESPONSIVE */
@media (max-width: 900px) {
  nav { padding: 1.25rem 1.5rem; }
  section { padding: 5rem 1.5rem; }
  #home { padding: 80px 1.5rem 0; }
  /* stack about text above the photo on small screens using grid (match specificity) */
  #about .about-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  #about .about-text { grid-row: 1; }
  #about .about-photo-wrap { grid-row: 2; margin: 0 auto; max-width: 100%; }
  .exp-item { grid-template-columns: 1fr; gap: 0.5rem; }
  .edu-grid { grid-template-columns: 1fr; }
  .skills-layout { grid-template-columns: 1fr; }
  .npm-grid { grid-template-columns: 1fr; }
  .github-grid { grid-template-columns: 1fr; }
  footer { flex-direction: column; align-items: flex-start; gap: 1.5rem; }
  .hero-bg-text { display: none; }
  .hero-footer { flex-direction: column; gap: 0.5rem; }
  .nav-links { gap: 1.25rem; }
  
  #education .edu-grid,
  #congresos .edu-grid,
  #conferences .edu-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .edu-card {
    padding: 1.25rem;
  }
}

/* allow the about photo to be a bit wider on large screens */
@media (min-width: 1200px) {
  .about-photo-wrap { max-width: 520px; }
  .about-photo-wrap img { max-width: 520px; }
  .about-photo-accent { top: -14px; left: -14px; right: -14px; bottom: -14px; }
}

/* Mobile hamburger button */
.mobile-fix-small {
  /* placeholder for specificity if needed */
}
@media (max-width: 600px) {
  /* squeeze paddings to fit small phones */
  nav { padding: 0.6rem 0.75rem; }
  section { padding: 2.25rem 0.8rem; }

  #home { padding: 72px 0.8rem 0; }

  .hero-content { padding: 1.25rem 0; max-width: 100%; }

  /* make the big name scale down and avoid causing overflow */
  .hero-name { font-size: clamp(2.2rem, 12vw, 3.8rem); line-height: 1; }

  /* ensure role tags wrap and shrink if needed */
  .hero-roles { gap: 0.35rem; }
  .role-tag { padding: 0.35rem 0.75rem; font-size: 11px; }

  /* force footer items to wrap and not push width */
  .hero-footer { flex-wrap: wrap; justify-content: flex-start; gap: 0.5rem; }
  .hero-footer-item { min-width: 0; white-space: normal; word-break: break-word; }

  /* reduce CTA button padding to avoid horizontal overflow */
  .hero-cta .btn { padding: 0.5rem 0.9rem; }
}
.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.hamburger {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  position: relative;
  transition: transform 0.28s ease, background 0.28s ease;
}
.hamburger::before, .hamburger::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--text);
  transition: transform 0.28s ease, opacity 0.28s ease;
}
.hamburger::before { top: -6px; }
.hamburger::after { bottom: -6px; }
.nav-toggle.open .hamburger { background: transparent; }
.nav-toggle.open .hamburger::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle.open .hamburger::after { transform: translateY(-6px) rotate(-45deg); }

/* Mobile full-screen menu */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 220;
  background: rgba(11,11,11,0.98);
  display: flex;
  align-items: center;
  justify-content: center;
  transform: translateY(-100%);
  transition: transform 0.45s cubic-bezier(.2,.9,.2,1);
  pointer-events: none;
}
.mobile-menu.open { transform: translateY(0); pointer-events: auto; }
.mobile-menu .mobile-close {
  position: absolute;
  top: 18px;
  right: 18px;
  background: transparent;
  border: none;
  color: var(--text);
  font-size: 22px;
  cursor: pointer;
}
.mobile-links { list-style:none; padding:0; margin:0; display:flex; flex-direction:column; gap:1.25rem; align-items:center; }
.mobile-links a { color: var(--text); text-decoration:none; font-size:1.6rem; font-weight:700; }

@media (max-width: 900px) {
  .nav-links { display:none; }
  .nav-toggle { display:flex; }
}