/* Design tokens: dark-first, light via the theme toggle */
:root {
  --bg: #0b1220;
  --bg-alt: #0e1628;
  --surface: #111b2e;
  --surface-2: #16223a;
  --border: #1e2a40;
  --text: #e5eaf3;
  --muted: #94a3b8;
  --accent: #93c5fd;
  --accent-strong: #2563eb;
  --on-accent: #ffffff;
  --ok: #34d399;
  --glow: #22f5ff;
  --neon-1: #4da6ff;
  --neon-2: #22f5ff;
  --neon-3: #b45cff;
  --neon-4: #a6ff1a;
  --neon-5: #ff3df2;
  --neon-6: #19ffc6;
  --radius: 14px;
  --max: 1160px;
  --font: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #f8fafc;
  --bg-alt: #f1f5f9;
  --surface: #ffffff;
  --surface-2: #f1f5f9;
  --border: #e2e8f0;
  --text: #0f172a;
  --muted: #475569;
  --accent: #2563eb;
  --accent-strong: #2563eb;
  --on-accent: #ffffff;
  --ok: #059669;
  --glow: #00c2d1;
  --neon-1: #2563eb;
  --neon-2: #00b8d4;
  --neon-3: #9333ea;
  --neon-4: #65c400;
  --neon-5: #e11dd0;
  --neon-6: #00c896;
  color-scheme: light;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
h1, h2, h3 { line-height: 1.2; margin: 0; letter-spacing: -0.01em; }
p { margin: 0 0 1em; }
ul { margin: 0; padding: 0; list-style: none; }
code { font-family: var(--mono); font-size: 0.88em; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.muted { color: var(--muted); }
.skip-link { position: absolute; left: -999px; top: 8px; background: var(--accent-strong); color: var(--on-accent); padding: 8px 14px; border-radius: 8px; z-index: 100; }
.skip-link:focus { left: 8px; }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 12px;
}

.icon { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex: none; }

/* Header */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav__inner { display: flex; align-items: center; gap: 24px; height: 68px; }
.nav__logo { font-family: var(--mono); font-weight: 500; color: var(--text); margin-right: auto; }
.nav__logo span { color: var(--accent); }
.nav__logo:hover { text-decoration: none; }
.nav__menu { display: flex; gap: 26px; align-items: center; }
.nav__menu a { color: var(--muted); font-size: 0.93rem; }
.nav__menu a:hover, .nav__menu a[aria-current="page"] { color: var(--text); text-decoration: none; }
.nav__menu a[aria-current="page"] { box-shadow: 0 2px 0 var(--accent); }
.nav__menu .nav__cta { color: var(--on-accent); background: var(--accent-strong); padding: 7px 16px; border-radius: 999px; box-shadow: none; }
.nav__menu .nav__cta:hover, .nav__menu .nav__cta[aria-current="page"] { color: var(--on-accent); box-shadow: none; }
.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}
.icon-btn:hover { color: var(--text); border-color: var(--muted); }
.theme-toggle .icon--sun { display: none; }
:root[data-theme="light"] .theme-toggle .icon--sun { display: block; }
:root[data-theme="light"] .theme-toggle .icon--moon { display: none; }
.nav__toggle { display: none; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform .15s, border-color .15s;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn--primary { background: var(--accent-strong); color: var(--on-accent); }
.btn--ghost { border-color: var(--border); color: var(--text); }
.btn--ghost:hover { border-color: var(--muted); }

/* Hero */
.hero {
  padding: 96px 0 72px;
  background:
    radial-gradient(640px 320px at 90% 10%, color-mix(in srgb, var(--accent-strong) 22%, transparent), transparent),
    radial-gradient(520px 280px at 0% 100%, color-mix(in srgb, var(--accent) 10%, transparent), transparent);
}
.hero__grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: center; }
.hero h1 { font-size: clamp(2.6rem, 6vw, 4.4rem); letter-spacing: -0.01em; text-transform: uppercase; margin-bottom: 14px; }
.hero h1 {
  color: #ffffff;
  text-shadow:
    0 0 6px color-mix(in srgb, var(--neon-2) 60%, transparent),
    0 0 18px color-mix(in srgb, var(--neon-2) 45%, transparent),
    0 0 36px color-mix(in srgb, var(--neon-3) 35%, transparent);
}
:root[data-theme="light"] .hero h1 { color: var(--text); text-shadow: 0 0 14px color-mix(in srgb, var(--neon-2) 35%, transparent); }
.hero__role { font-size: clamp(1.1rem, 2.2vw, 1.4rem); font-weight: 600; margin: 0 0 20px; }
.hero__role-text { display: block; color: var(--text); }
.hero__role-sub { display: block; color: var(--accent); }
.hero__lead { font-size: 1.15rem; color: var(--muted); max-width: 36em; margin: 0 0 32px; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 28px; }
.socials { display: flex; flex-wrap: wrap; gap: 10px; }
.socials a { display: inline-flex; align-items: center; gap: 8px; color: var(--muted); font-size: 0.88rem; border: 1px solid var(--border); border-radius: 999px; padding: 6px 12px; }
.socials a:hover { color: var(--text); border-color: var(--muted); text-decoration: none; }
.socials .icon { width: 16px; height: 16px; }

/* Hero skills panel */
.skills-panel {
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: color-mix(in srgb, var(--surface) 85%, transparent);
}
.skills-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 20px; }
.skills-label { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin: 18px 0 10px; }
.skills-grid li {
  padding: 14px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface-2);
}
.skills-grid strong { display: block; font-size: 0.92rem; line-height: 1.3; letter-spacing: -0.01em; }
.skills-grid span { display: block; margin-top: 2px; font-family: var(--mono); font-size: 0.74rem; line-height: 1.4; color: var(--accent); }

/* Proof strip */
.proof { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--bg-alt); }
.proof__list { display: flex; }
.proof__item { flex: 1 1 0; min-width: 0; padding: 26px 20px; border-left: 1px solid var(--border); }
.proof__item:first-child { border-left: 0; padding-left: 0; }
.proof__item a { color: inherit; }
.proof__item a:hover { text-decoration: none; }
.proof__num { display: block; font-family: var(--mono); font-size: 1.9rem; font-weight: 500; color: var(--text); line-height: 1.1; }
.proof__label { display: block; color: var(--muted); font-size: 0.9rem; margin-top: 4px; }

/* Page header (inner pages) */
.page-head { padding: 80px 0 48px; border-bottom: 1px solid var(--border); background: radial-gradient(600px 260px at 85% 0%, color-mix(in srgb, var(--accent-strong) 16%, transparent), transparent); }
.page-head h1 { font-size: clamp(2.1rem, 5vw, 3.2rem); letter-spacing: -0.02em; margin-bottom: 14px; }
.page-head .lead { font-size: 1.12rem; color: var(--muted); max-width: 44em; margin: 0; }
.crumbs { font-family: var(--mono); font-size: 0.78rem; color: var(--muted); margin-bottom: 18px; }
.crumbs a { color: var(--muted); }

/* Sections */
.section { padding: 88px 0; }
.section--alt { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section h2 { font-size: clamp(1.6rem, 3.4vw, 2.2rem); margin-bottom: 14px; }
.section__head { display: flex; justify-content: space-between; align-items: end; gap: 24px; flex-wrap: wrap; margin-bottom: 36px; }
.section__head .section__lead { margin-bottom: 0; }
.section__lead { color: var(--muted); font-size: 1.06rem; max-width: 46em; margin: 0 0 36px; }
.more { font-weight: 600; font-size: 0.95rem; white-space: nowrap; }
.prose { max-width: 46em; }
.prose p { color: var(--muted); font-size: 1.04rem; }
.prose .eyebrow { color: var(--accent); font-size: 0.78rem; }
.container.prose { max-width: var(--max); }
.container.prose > * { max-width: 46em; }
.split { display: grid; grid-template-columns: 1fr 1.6fr; gap: 56px; align-items: start; }

/* Cards */
.cards { display: grid; gap: 20px; }
.cards--2 { grid-template-columns: repeat(2, 1fr); }
.cards--3 { grid-template-columns: repeat(3, 1fr); }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.card h3 { font-size: 1.15rem; }
.card p { margin: 0; color: var(--muted); }
.card__links { margin-top: auto; display: flex; flex-wrap: wrap; gap: 8px 20px; padding-top: 6px; }
.card__links a { font-weight: 600; font-size: 0.93rem; }
.card__meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }

.tag {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent-strong) 14%, transparent);
  padding: 3px 10px;
  border-radius: 6px;
  white-space: nowrap;
}
.status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ok);
  border: 1px solid color-mix(in srgb, var(--ok) 40%, transparent);
  padding: 2px 10px;
  border-radius: 999px;
  white-space: nowrap;
}
.status::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips li {
  font-size: 0.82rem;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
}
.chips--mono li { font-family: var(--mono); font-size: 0.78rem; }

/* Project cards */
.card.project { padding: 0; gap: 0; overflow: hidden; }
.project__body { padding: 28px; display: flex; flex-direction: column; gap: 14px; flex: 1; }
.project__head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.project__band {
  padding: 26px 28px;
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(320px 120px at 100% 0%, color-mix(in srgb, var(--accent-strong) 22%, transparent), transparent),
    var(--surface-2);
}
.project__band h2, .project__band h3 { font-size: 1.6rem; margin: 0; letter-spacing: -0.02em; }
.card .project__value { font-size: 1.02rem; color: var(--text); }

.checklist li { padding: 12px 0 12px 30px; border-top: 1px solid var(--border); position: relative; color: var(--muted); }
.checklist li:first-child { border-top: 0; }
.checklist li::before { content: "→"; position: absolute; left: 0; color: var(--accent); font-family: var(--mono); }
.checklist strong { color: var(--text); }

/* Standards */
.standard { gap: 18px; }
.standard h3 { font-size: 1.25rem; }
.facts { display: grid; grid-template-columns: max-content 1fr; gap: 6px 18px; font-size: 0.9rem; margin: 0; }
.facts dt { color: var(--muted); font-family: var(--mono); font-size: 0.78rem; padding-top: 2px; }
.facts dd { margin: 0; }
.mission {
  margin: 40px 0 0;
  padding: 4px 0 4px 20px;
  border-left: 3px solid var(--accent-strong);
  font-size: 1.2rem;
  font-weight: 500;
  max-width: 42em;
}
.disclaimer { font-size: 0.85rem; color: var(--muted); border: 1px dashed var(--border); border-radius: 10px; padding: 14px 16px; margin-top: 32px; }

/* Awards */
.award { flex-direction: row; align-items: center; gap: 20px; }
.award__logo {
  flex: none;
  width: 76px;
  height: 76px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: #ffffff;
  border: 1px solid var(--border);
}
.award__logo-svg { width: 44px; height: 44px; }
.award a { font-weight: 600; font-size: 0.93rem; }

/* Community */
.community { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.community--home { grid-template-columns: repeat(3, 1fr); }
.community__item {
  display: flex;
  gap: 18px;
  padding: 22px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.community__item h3 { font-size: 1.08rem; margin-bottom: 4px; }
.community__item p { margin: 0; font-size: 0.93rem; color: var(--muted); }
.community__item .community__role { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.05em; text-transform: uppercase; color: var(--accent); margin-bottom: 6px; }
.community__mark {
  flex: none;
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent-strong) 14%, transparent);
}
.community--home .community__item { padding: 18px; gap: 14px; }
.community--home .community__mark { width: 44px; height: 44px; font-size: 0.66rem; }

/* About */
/* Hexagon portrait with fluorescent frame */
.portrait-frame {
  --hex: polygon(50% 0, 100% 25%, 100% 75%, 50% 100%, 0 75%, 0 25%);
  width: 100%;
  max-width: 320px;
  filter: drop-shadow(0 0 10px color-mix(in srgb, var(--neon-2) 70%, transparent)) drop-shadow(0 0 26px color-mix(in srgb, var(--neon-5) 45%, transparent));
  animation: portrait-glow 4s ease-in-out infinite alternate;
}
.portrait-hex {
  aspect-ratio: 0.866;
  padding: 6px;
  clip-path: var(--hex);
  background: conic-gradient(from 200deg, var(--neon-2), var(--neon-1), var(--neon-3), var(--neon-5), var(--neon-4), var(--neon-6), var(--neon-2));
}
.portrait {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% calc(22% + 20px);
  clip-path: var(--hex);
  background: #ffffff;
}
@keyframes portrait-glow {
  to { filter: drop-shadow(0 0 14px color-mix(in srgb, var(--neon-3) 75%, transparent)) drop-shadow(0 0 34px color-mix(in srgb, var(--neon-2) 50%, transparent)); }
}
@media (prefers-reduced-motion: reduce) { .portrait-frame { animation: none; } }
.edu li { padding: 14px 0; border-top: 1px solid var(--border); }
.edu li:first-child { border-top: 0; }
.edu strong { display: block; }

/* Contact */
.topics { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.topic { display: flex; flex-direction: column; gap: 6px; padding: 22px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); color: var(--text); }
.topic strong { font-size: 1.04rem; }
.topic span { color: var(--muted); font-size: 0.92rem; }
.topic em { font-style: normal; color: var(--accent); font-size: 0.88rem; font-weight: 600; margin-top: auto; }
.contact-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 32px; }
.contact-link { display: flex; align-items: center; gap: 12px; padding: 18px 20px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); color: var(--text); overflow-wrap: anywhere; }
.contact-link small { display: block; font-family: var(--mono); font-size: 0.74rem; color: var(--muted); }

/* CTA band */
.cta { text-align: center; }
.cta h2 { margin-bottom: 12px; }
.cta p { color: var(--muted); max-width: 40em; margin: 0 auto 28px; font-size: 1.06rem; }
.cta .eyebrow { color: var(--accent); font-size: 0.78rem; margin: 0 auto 12px; }
.cta .hero__actions { justify-content: center; margin: 0; }

/* Footer */
.footer { padding: 36px 0; border-top: 1px solid var(--border); font-size: 0.88rem; color: var(--muted); }
.footer__inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px 32px; }
.footer p { margin: 0; }
.footer nav { display: flex; gap: 18px; flex-wrap: wrap; }
.footer nav a { color: var(--muted); }
.footer__note { width: 100%; font-size: 0.8rem; }

/* Reveal on scroll */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn:hover { transform: none; }
}

/* Responsive */
@media (max-width: 1000px) {
  .proof__list { display: grid; grid-template-columns: repeat(3, 1fr); }
  .proof__item:nth-child(4) { border-left: 0; padding-left: 0; }
  .proof__item:nth-child(n+4) { border-top: 1px solid var(--border); }
  .cards--3, .community--home { grid-template-columns: 1fr 1fr; }
  .hero__grid, .split { grid-template-columns: 1fr; gap: 40px; }
  .contact-links { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  .nav__toggle { display: inline-grid; }
  .nav__menu {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 16px 16px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    display: none;
  }
  .nav__menu.is-open { display: flex; }
  .nav__menu a { padding: 13px 0; border-top: 1px solid var(--border); }
  .nav__menu a:first-child { border-top: 0; }
  .nav__menu a[aria-current="page"] { box-shadow: none; color: var(--accent); }
  .nav__menu .nav__cta { margin-top: 10px; text-align: center; padding: 12px; }
}

@media (max-width: 720px) {
  .container { padding: 0 16px; }
  .hero { padding: 56px 0 48px; }
  .page-head { padding: 56px 0 36px; }
  .section { padding: 64px 0; }
  .cards--2, .cards--3, .community, .community--home { grid-template-columns: 1fr; }
  .proof__list { grid-template-columns: 1fr 1fr; }
  .proof__item, .proof__item:nth-child(n) { border-left: 0; padding: 18px 0; border-top: 1px solid var(--border); }
  .proof__item:nth-child(-n+2) { border-top: 0; }
  .card, .project__body { padding: 22px; }
  .skills-panel { padding: 18px; }
  .skills-grid li { padding: 12px 10px; }
  .skills-grid strong { font-size: 0.8rem; }
  .skills-grid span { font-size: 0.68rem; }
  .award { flex-direction: column; align-items: flex-start; }
  .facts { grid-template-columns: 1fr; gap: 2px; }
  .facts dd { margin-bottom: 8px; }
}

/* Certifications */
.certs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.cert {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 6px;
  padding: 28px 20px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}
.cert img { width: 132px; height: 132px; object-fit: contain; margin-bottom: 10px; transition: transform .25s ease; }
.cert:hover img { transform: scale(1.05); }
.cert h3 { font-size: 1rem; line-height: 1.35; }
.cert p { margin: 0; color: var(--muted); font-size: 0.85rem; }
@media (max-width: 1000px) { .certs { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .cert img { width: 104px; height: 104px; } .cert { padding: 22px 14px 20px; } }

.teaching {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 32px;
  align-items: center;
  margin-top: 28px;
  padding: 32px;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border));
  border-radius: var(--radius);
  background:
    radial-gradient(400px 160px at 100% 0%, color-mix(in srgb, var(--accent-strong) 16%, transparent), transparent),
    var(--surface);
}
.teaching h3 { font-size: 1.35rem; margin-bottom: 12px; }
.teaching p:not(.eyebrow) { color: var(--muted); margin: 0; }
.teaching__facts { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.teaching__facts li { padding: 14px 16px; border-radius: 12px; background: var(--surface-2); border: 1px solid var(--border); }
.teaching__facts strong { display: block; font-family: var(--mono); font-size: 1.1rem; font-weight: 500; }
.teaching__facts span { display: block; color: var(--muted); font-size: 0.82rem; line-height: 1.4; }
@media (max-width: 900px) { .teaching { grid-template-columns: 1fr; padding: 22px; } }

/* Fluorescent glow, shared by every box: always on, brighter on hover */
.card, .cert, .community__item, .topic, .contact-link, .skills-grid li, .teaching, .teaching__facts li {
  border-color: var(--glow);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--glow) 60%, transparent), 0 0 14px color-mix(in srgb, var(--glow) 30%, transparent);
  transition: box-shadow .25s ease, transform .25s ease;
}
.card:hover, .cert:hover, .community__item:hover, .topic:hover, .contact-link:hover,
.skills-grid li:hover, .teaching:hover, .teaching__facts li:hover {
  box-shadow: 0 0 0 1px var(--glow), 0 0 22px color-mix(in srgb, var(--glow) 60%, transparent), 0 0 48px color-mix(in srgb, var(--glow) 30%, transparent);
  transform: translateY(-3px);
  text-decoration: none;
}
.teaching:hover { transform: none; }

/* Neighbouring boxes cycle through the neon palette */
:is(.cards, .community, .topics, .skills-grid, .contact-links, .teaching__facts) > :nth-child(6n+1) { --glow: var(--neon-1); }
:is(.cards, .community, .topics, .skills-grid, .contact-links, .teaching__facts) > :nth-child(6n+2) { --glow: var(--neon-2); }
:is(.cards, .community, .topics, .skills-grid, .contact-links, .teaching__facts) > :nth-child(6n+3) { --glow: var(--neon-3); }
:is(.cards, .community, .topics, .skills-grid, .contact-links, .teaching__facts) > :nth-child(6n+4) { --glow: var(--neon-4); }
:is(.cards, .community, .topics, .skills-grid, .contact-links, .teaching__facts) > :nth-child(6n+5) { --glow: var(--neon-5); }
:is(.cards, .community, .topics, .skills-grid, .contact-links, .teaching__facts) > :nth-child(6n+6) { --glow: var(--neon-6); }

@media (prefers-reduced-motion: reduce) {
  .card, .cert, .community__item, .topic, .contact-link, .skills-grid li, .teaching, .teaching__facts li, .cert img { transition: none; }
  :is(.card, .cert, .community__item, .topic, .contact-link, .skills-grid li, .teaching__facts li):hover,
  .cert:hover img { transform: none; }
}

@media (max-width: 400px) { .skills-grid { grid-template-columns: 1fr 1fr; } }
.card .project__role { margin: 8px 0 0; font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent); }

/* IEEE identification without the IEEE logo */
.tag--ieee {
  font-size: 0.95rem;
  font-weight: 500;
  padding: 5px 12px;
  letter-spacing: 0.02em;
  color: color-mix(in srgb, var(--glow) 45%, #ffffff);
  background: color-mix(in srgb, var(--glow) 18%, transparent);
  border: 1px solid var(--glow);
  box-shadow: 0 0 10px color-mix(in srgb, var(--glow) 45%, transparent), inset 0 0 8px color-mix(in srgb, var(--glow) 18%, transparent);
  text-shadow: 0 0 8px color-mix(in srgb, var(--glow) 60%, transparent);
}
:root[data-theme="light"] .tag--ieee { color: var(--glow); text-shadow: none; }
.card .ieee-line { font-size: 0.88rem; margin-top: auto; padding-top: 4px; }
.card .ieee-line a { font-weight: 600; }

/* Mentoring & judging */
.cards--4 { grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }
.mentor { gap: 6px; }
.card .mentor__role { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--glow); margin-bottom: 6px; }
.mentor h3 { font-size: 1.2rem; }
@media (max-width: 720px) { .cards--4 { grid-template-columns: 1fr; } }

/* Project gallery */
.gallery { align-items: stretch; }
.card.shot { padding: 0; gap: 0; overflow: hidden; }
.shot__thumb {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  border-bottom: 1px solid var(--border);
  background: #0a0f1a;
  cursor: zoom-in;
  aspect-ratio: 16 / 10;
  overflow: hidden;
}
.shot__thumb img { width: 100%; height: 100%; object-fit: cover; object-position: top center; transition: transform .35s ease; }
.shot__thumb:hover img, .shot__thumb:focus-visible img { transform: scale(1.04); }
.shot__count {
  position: absolute;
  right: 10px;
  bottom: 10px;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: #e5eaf3;
  background: rgba(11, 18, 32, 0.85);
  border: 1px solid var(--glow);
  padding: 3px 9px;
  border-radius: 999px;
}
.shot__body { padding: 22px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
.shot__body h3 { font-size: 1.12rem; }
.shot__body p { font-size: 0.92rem; }

/* Diagram viewer */
.lightbox {
  width: min(1400px, 96vw);
  max-height: 94vh;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: #070c16;
  color: #e5eaf3;
  overflow: hidden;
}
.lightbox::backdrop { background: rgba(3, 6, 12, 0.85); backdrop-filter: blur(4px); }
.lightbox__bar { display: flex; align-items: center; gap: 14px; padding: 12px 16px; border-bottom: 1px solid #1e2a40; }
.lightbox__title { margin: 0; font-weight: 600; margin-right: auto; }
.lightbox__pos { font-family: var(--mono); font-size: 0.8rem; color: #94a3b8; }
.lightbox .icon-btn { color: #e5eaf3; border-color: #1e2a40; font-size: 1.1rem; }
.lightbox__stage { position: relative; display: grid; place-items: center; padding: 12px; max-height: calc(94vh - 64px); }
.lightbox__img { max-width: 100%; max-height: calc(94vh - 90px); object-fit: contain; border-radius: 8px; background: #fff; }
.lightbox__nav { position: absolute; top: 50%; transform: translateY(-50%); background: rgba(11, 18, 32, 0.85); }
.lightbox__prev { left: 16px; }
.lightbox__next { right: 16px; }
.lightbox[data-single] .lightbox__nav, .lightbox[data-single] .lightbox__pos { display: none; }

/* Standards call to action */
.card.join { margin-top: 48px; padding: 40px; gap: 12px; --glow: var(--neon-3); }
.card.join h2 { font-size: clamp(1.5rem, 3vw, 2rem); margin-bottom: 6px; }
.card.join p { font-size: 1.04rem; max-width: 52em; }
.card.join .eyebrow { font-size: 0.78rem; color: var(--accent); }
.card .join__rally { color: var(--text); font-size: 1.2rem; font-weight: 600; line-height: 1.5; margin: 6px 0 14px; }
.card.join .hero__actions { margin: 0; }
.card.join:hover { transform: none; }
@media (max-width: 720px) { .card.join { padding: 24px; } }
.mentor__link {
  align-self: flex-start;
  margin-top: auto;
  padding: 6px 16px;
  border: 1px solid var(--glow);
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--text);
  background: color-mix(in srgb, var(--glow) 14%, transparent);
  box-shadow: 0 0 10px color-mix(in srgb, var(--glow) 35%, transparent);
  transition: background .2s ease, box-shadow .2s ease;
}
.mentor__link:hover { text-decoration: none; background: color-mix(in srgb, var(--glow) 28%, transparent); box-shadow: 0 0 16px color-mix(in srgb, var(--glow) 55%, transparent); }