/* ============================================================
   TOKENS
   ============================================================ */
:root{
  --navy: #0a0e27;
  --panel: #131830;
  --panel-2: #181f3d;
  --cyan: #00f0ff;
  --violet: #7b2ff7;
  --gold: #ffb800;
  --ink: #e8eef5;
  --ink-dim: #8b93b3;
  --ink-faint: #5a6182;
  --line: rgba(232,238,245,0.08);

  --display: "Space Grotesk", sans-serif;
  --body: "Inter", sans-serif;
  --mono: "JetBrains Mono", monospace;

  --container: 1180px;
  --ease: cubic-bezier(.16,.84,.44,1);
}

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

html{ scroll-behavior:smooth; }

body{
  background:var(--navy);
  color:var(--ink);
  font-family:var(--body);
  line-height:1.6;
  overflow-x:hidden;
  cursor:none;
}

@media (max-width: 860px){
  body{ cursor:auto; }
}

a{ color:inherit; text-decoration:none; }
.mono{ font-family:var(--mono); letter-spacing:0.04em; }

::selection{ background:var(--cyan); color:var(--navy); }

img{ max-width:100%; display:block; }

button{ font:inherit; background:none; border:none; color:inherit; cursor:pointer; }

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce){
  *{ animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; scroll-behavior:auto !important; }
}

/* ============================================================
   AMBIENT BACKGROUND CANVAS
   ============================================================ */
#net-bg{
  position:fixed;
  inset:0;
  z-index:0;
  opacity:0.5;
}

/* ============================================================
   CUSTOM CURSOR
   ============================================================ */
.cursor-dot, .cursor-ring{
  position:fixed;
  top:0; left:0;
  pointer-events:none;
  z-index:9999;
  border-radius:50%;
  transform:translate(-50%,-50%);
}
.cursor-dot{
  width:6px; height:6px;
  background:var(--cyan);
}
.cursor-ring{
  width:34px; height:34px;
  border:1px solid rgba(0,240,255,0.5);
  transition:width .25s var(--ease), height .25s var(--ease), border-color .25s var(--ease), opacity .25s;
}
.cursor-ring.is-active{
  width:54px; height:54px;
  border-color:var(--gold);
}
@media (max-width:860px){
  .cursor-dot,.cursor-ring{ display:none; }
}

/* ============================================================
   SCROLL PROGRESS THREAD
   ============================================================ */
.scroll-thread{
  position:fixed;
  top:0; left:0;
  width:3px; height:100%;
  background:rgba(255,255,255,0.04);
  z-index:200;
}
.scroll-thread__fill{
  width:100%; height:0%;
  background:linear-gradient(180deg,var(--cyan),var(--violet));
  box-shadow:0 0 12px var(--cyan);
}

/* ============================================================
   NAV
   ============================================================ */
.nav{
  position:fixed;
  top:0; left:0; right:0;
  z-index:100;
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:24px 48px;
  backdrop-filter:blur(10px);
  background:linear-gradient(180deg, rgba(10,14,39,0.85), transparent);
}
.nav__mark{
  font-family:var(--display);
  font-weight:700;
  font-size:1.1rem;
  letter-spacing:0.05em;
}
.nav__mark span{ color:var(--cyan); }

.nav__links{
  display:flex;
  gap:32px;
}
.nav__links a{
  font-family:var(--mono);
  font-size:0.72rem;
  letter-spacing:0.08em;
  color:var(--ink-dim);
  position:relative;
  transition:color .3s;
}
.nav__links a::after{
  content:"";
  position:absolute;
  left:0; bottom:-6px;
  width:0; height:1px;
  background:var(--cyan);
  transition:width .3s var(--ease);
}
.nav__links a:hover, .nav__links a.is-active{ color:var(--ink); }
.nav__links a:hover::after, .nav__links a.is-active::after{ width:100%; }

.nav__toggle{
  display:none;
  flex-direction:column;
  gap:5px;
  width:28px;
}
.nav__toggle span{
  height:1px; background:var(--ink); width:100%;
  transition:transform .3s, opacity .3s;
}

@media (max-width:860px){
  .nav{ padding:20px 24px; }
  .nav__links{
    position:fixed;
    top:0; right:0;
    height:100vh;
    width:min(78vw,320px);
    background:var(--panel);
    flex-direction:column;
    justify-content:center;
    gap:28px;
    padding:0 40px;
    transform:translateX(100%);
    transition:transform .4s var(--ease);
    border-left:1px solid var(--line);
  }
  .nav__links.is-open{ transform:translateX(0); }
  .nav__toggle{ display:flex; z-index:101; }
  .nav__toggle.is-open span:nth-child(1){ transform:translateY(6px) rotate(45deg); }
  .nav__toggle.is-open span:nth-child(2){ opacity:0; }
  .nav__toggle.is-open span:nth-child(3){ transform:translateY(-6px) rotate(-45deg); }
}

/* ============================================================
   HERO
   ============================================================ */
.hero{
  position:relative;
  min-height:100vh;
  display:flex;
  align-items:center;
  padding:0 48px;
  overflow:hidden;
  z-index:1;
}

.hero__orb{
  position:absolute;
  right:-8%;
  top:50%;
  transform:translateY(-50%);
  width:min(60vw,720px);
  height:min(60vw,720px);
  z-index:0;
  opacity:0.95;
}
#orbCanvas{ width:100%; height:100%; display:block; }

.hero__content{
  position:relative;
  z-index:2;
  max-width:640px;
}

.eyebrow{
  color:var(--cyan);
  font-size:0.7rem;
  margin-bottom:20px;
  display:inline-block;
}

.hero__title{
  font-family:var(--display);
  font-weight:700;
  font-size:clamp(3rem,7vw,5.6rem);
  line-height:0.98;
  letter-spacing:-0.01em;
}
.hero__title-line{ display:block; opacity:0; transform:translateY(30px); animation:riseIn .9s var(--ease) forwards; }
.hero__title-line:nth-child(2){ animation-delay:.12s; }
.hero__title-accent{
  background:linear-gradient(100deg,var(--cyan),var(--violet));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}

.hero__role{
  margin-top:18px;
  font-size:1.15rem;
  color:var(--ink-dim);
  font-weight:500;
}

.hero__desc{
  margin-top:18px;
  max-width:480px;
  color:var(--ink-dim);
  font-size:1rem;
}

.hero__cta{
  margin-top:36px;
  display:flex;
  gap:16px;
  flex-wrap:wrap;
}

.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:14px 26px;
  border-radius:2px;
  font-size:0.85rem;
  font-weight:600;
  letter-spacing:0.02em;
  transition:transform .3s var(--ease), box-shadow .3s var(--ease), background .3s, border-color .3s;
}
.btn--primary{
  background:var(--ink);
  color:var(--navy);
}
.btn--primary:hover{
  transform:translateY(-2px);
  box-shadow:0 10px 30px rgba(0,240,255,0.25);
}
.btn--ghost{
  border:1px solid var(--line);
  color:var(--ink);
}
.btn--ghost:hover{
  border-color:var(--cyan);
  color:var(--cyan);
}
.btn__arrow{ transition:transform .3s var(--ease); }
.btn:hover .btn__arrow{ transform:translateX(4px); }
.btn--full{ width:100%; justify-content:center; }

.hero__scroll-cue{
  position:absolute;
  bottom:40px;
  left:48px;
  display:flex;
  align-items:center;
  gap:10px;
  font-size:0.65rem;
  color:var(--ink-faint);
  z-index:2;
}
.hero__scroll-line{
  width:1px; height:40px;
  background:linear-gradient(180deg,var(--cyan),transparent);
  animation:scrollPulse 2s ease-in-out infinite;
}

@keyframes riseIn{ to{ opacity:1; transform:translateY(0); } }
@keyframes scrollPulse{ 0%,100%{ opacity:0.3; } 50%{ opacity:1; } }

@media (max-width:860px){
  .hero{ padding:0 24px; }
  .hero__orb{ right:-30%; width:90vw; height:90vw; opacity:0.5; }
  .hero__scroll-cue{ left:24px; }
}

/* ============================================================
   SECTIONS — shared
   ============================================================ */
.section{
  position:relative;
  z-index:1;
  padding:140px 48px;
  max-width:var(--container);
  margin:0 auto;
}
.section--alt{
  max-width:none;
  background:linear-gradient(180deg, transparent, rgba(19,24,48,0.5) 8%, rgba(19,24,48,0.5) 92%, transparent);
}
.section--alt > *{
  max-width:var(--container);
  margin-left:auto;
  margin-right:auto;
}

.section__head{
  display:flex;
  align-items:baseline;
  gap:18px;
  margin-bottom:56px;
}
.section__num{
  color:var(--cyan);
  font-size:0.85rem;
}
.section__title{
  font-family:var(--display);
  font-weight:600;
  font-size:clamp(1.8rem,3.4vw,2.6rem);
}

.reveal{
  opacity:0;
  transform:translateY(28px);
  transition:opacity .8s var(--ease), transform .8s var(--ease);
}
.reveal.is-visible{
  opacity:1;
  transform:translateY(0);
}

@media (max-width:860px){
  .section{ padding:100px 24px; }
}

/* ============================================================
   ABOUT
   ============================================================ */
.about__grid{
  display:grid;
  grid-template-columns:280px 1fr;
  gap:64px;
  align-items:start;
}

.about__portrait{
  transform-style:preserve-3d;
  transition:transform .15s ease-out;
}
.about__portrait-frame{
  position:relative;
  aspect-ratio:1;
  border:1px solid var(--line);
  display:flex;
  align-items:center;
  justify-content:center;
  background:var(--panel);
  overflow:hidden;
}
.about__portrait-initials{
  font-family:var(--display);
  font-size:4rem;
  font-weight:700;
  background:linear-gradient(140deg,var(--cyan),var(--violet));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  z-index:1;
}
.about__portrait-grid{
  position:absolute; inset:0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size:24px 24px;
  opacity:0.6;
}

.about__body p{ color:var(--ink-dim); margin-bottom:18px; max-width:620px; }
.about__body strong{ color:var(--ink); }

.stats{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:24px;
  margin-top:40px;
  padding-top:32px;
  border-top:1px solid var(--line);
}
.stat__num{
  display:block;
  font-size:2.2rem;
  font-weight:500;
  color:var(--cyan);
}
.stat__label{
  display:block;
  margin-top:6px;
  font-size:0.78rem;
  color:var(--ink-faint);
}

@media (max-width:860px){
  .about__grid{ grid-template-columns:1fr; gap:36px; }
  .about__portrait-frame{ max-width:200px; }
  .stats{ grid-template-columns:repeat(2,1fr); gap:28px 16px; }
}

/* ============================================================
   RESEARCH
   ============================================================ */
.research__grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
}

.research-card{
  position:relative;
  background:var(--panel);
  padding:40px;
  transform-style:preserve-3d;
  transition:transform .15s ease-out, background .3s;
  overflow:hidden;
}
.research-card__glow{
  position:absolute;
  width:240px; height:240px;
  background:radial-gradient(circle, rgba(0,240,255,0.18), transparent 70%);
  top:var(--my,-50%); left:var(--mx,-50%);
  transform:translate(-50%,-50%);
  pointer-events:none;
  opacity:0;
  transition:opacity .3s;
}
.research-card:hover .research-card__glow{ opacity:1; }
.research-card:hover{ background:var(--panel-2); }

.research-card__tag{
  display:inline-block;
  font-size:0.65rem;
  color:var(--gold);
  margin-bottom:18px;
}
.research-card h3{
  font-family:var(--display);
  font-size:1.3rem;
  font-weight:600;
  margin-bottom:12px;
}
.research-card p{ color:var(--ink-dim); font-size:0.92rem; max-width:420px; }
.research-card__link{
  display:inline-block;
  margin-top:18px;
  font-size:0.78rem;
  color:var(--ink-faint);
}

@media (max-width:860px){
  .research__grid{ grid-template-columns:1fr; }
  .research-card{ padding:28px; }
}

/* ============================================================
   PUBLICATIONS
   ============================================================ */
.pub-filters{
  display:flex;
  gap:10px;
  margin-bottom:40px;
  flex-wrap:wrap;
}
.pub-filter{
  padding:8px 16px;
  font-size:0.72rem;
  border:1px solid var(--line);
  color:var(--ink-faint);
  border-radius:20px;
  transition:border-color .3s, color .3s;
}
.pub-filter:hover{ color:var(--ink); }
.pub-filter.is-active{ border-color:var(--cyan); color:var(--cyan); }

.pub{
  display:grid;
  grid-template-columns:80px 1fr 44px;
  gap:24px;
  padding:28px 0;
  border-bottom:1px solid var(--line);
  align-items:start;
  transition:opacity .3s, transform .3s;
}
.pub.is-hidden{ display:none; }

.pub__year{ color:var(--cyan); font-size:0.85rem; padding-top:4px; }
.pub__title{
  font-family:var(--display);
  font-size:1.08rem;
  font-weight:600;
  margin-bottom:8px;
}
.pub__meta{ color:var(--ink-faint); font-size:0.74rem; margin-bottom:10px; }
.pub__abstract{
  color:var(--ink-dim);
  font-size:0.9rem;
  max-width:680px;
  max-height:0;
  overflow:hidden;
  opacity:0;
  transition:max-height .4s var(--ease), opacity .4s var(--ease);
}
.pub.is-open .pub__abstract{ max-height:200px; opacity:1; }

.pub__expand{
  width:36px; height:36px;
  border:1px solid var(--line);
  border-radius:50%;
  font-size:1.1rem;
  color:var(--ink-dim);
  transition:transform .3s var(--ease), border-color .3s, color .3s;
  justify-self:end;
}
.pub.is-open .pub__expand{ transform:rotate(45deg); border-color:var(--cyan); color:var(--cyan); }

@media (max-width:860px){
  .pub{ grid-template-columns:1fr 36px; }
  .pub__year{ grid-column:1 / -1; }
}

/* ============================================================
   COURSES
   ============================================================ */
.courses__grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:20px;
}
.course-card{
  background:var(--panel);
  border:1px solid var(--line);
  padding:28px 24px;
  transition:border-color .3s, transform .3s var(--ease);
}
.course-card:hover{
  border-color:var(--violet);
  transform:translateY(-4px);
}
.course-card__code{
  display:inline-block;
  font-size:0.7rem;
  color:var(--violet);
  margin-bottom:14px;
}
.course-card h3{
  font-family:var(--display);
  font-size:1.05rem;
  font-weight:600;
  margin-bottom:10px;
}
.course-card p{
  color:var(--ink-dim);
  font-size:0.85rem;
  margin-bottom:18px;
}
.course-card__term{
  font-size:0.65rem;
  color:var(--ink-faint);
}

@media (max-width:1024px){
  .courses__grid{ grid-template-columns:repeat(2,1fr); }
}
@media (max-width:600px){
  .courses__grid{ grid-template-columns:1fr; }
}

/* ============================================================
   ACHIEVEMENTS / TIMELINE
   ============================================================ */
.timeline{
  position:relative;
  padding-left:40px;
}
.timeline__line{
  position:absolute;
  left:6px; top:6px; bottom:6px;
  width:1px;
  background:linear-gradient(180deg,var(--cyan),var(--violet),transparent);
}
.timeline__item{
  position:relative;
  padding-bottom:48px;
}
.timeline__item:last-child{ padding-bottom:0; }
.timeline__dot{
  position:absolute;
  left:-40px; top:4px;
  width:13px; height:13px;
  border-radius:50%;
  background:var(--navy);
  border:2px solid var(--cyan);
}
.timeline__year{
  color:var(--gold);
  font-size:0.78rem;
}
.timeline__item h3{
  font-family:var(--display);
  font-size:1.15rem;
  font-weight:600;
  margin:8px 0 8px;
}
.timeline__item p{ color:var(--ink-dim); font-size:0.92rem; max-width:560px; }

/* ============================================================
   CONTACT
   ============================================================ */
.contact__grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:72px;
}
.contact__lede{
  font-size:1.15rem;
  color:var(--ink-dim);
  max-width:420px;
  margin-bottom:40px;
}
.contact__details{
  display:grid;
  grid-template-columns:max-content 1fr;
  gap:10px 24px;
  font-size:0.82rem;
}
.contact__details dt{ color:var(--ink-faint); }
.contact__details dd a{ color:var(--cyan); }
.contact__details dd:not(:has(a)){ color:var(--ink); }

.contact__socials{
  display:flex;
  gap:24px;
  margin-top:40px;
  flex-wrap:wrap;
}
.contact__social-link{
  font-size:0.78rem;
  color:var(--ink-dim);
  border-bottom:1px solid var(--line);
  padding-bottom:4px;
  transition:color .3s, border-color .3s;
}
.contact__social-link:hover{ color:var(--cyan); border-color:var(--cyan); }

.contact__form{ display:flex; flex-direction:column; gap:24px; }
.field{ position:relative; }
.field input, .field textarea{
  width:100%;
  background:transparent;
  border:none;
  border-bottom:1px solid var(--line);
  color:var(--ink);
  font-family:var(--body);
  font-size:0.95rem;
  padding:10px 0;
  resize:none;
  transition:border-color .3s;
}
.field input:focus, .field textarea:focus{
  outline:none;
  border-color:var(--cyan);
}
.field label{
  position:absolute;
  left:0; top:10px;
  color:var(--ink-faint);
  font-size:0.95rem;
  transition:transform .2s var(--ease), font-size .2s var(--ease), color .2s;
  pointer-events:none;
}
.field input:focus + label,
.field input:not(:placeholder-shown) + label,
.field textarea:focus + label,
.field textarea:not(:placeholder-shown) + label{
  transform:translateY(-22px);
  font-size:0.7rem;
  color:var(--cyan);
}
.contact__form-note{
  font-size:0.75rem;
  color:var(--gold);
  min-height:1em;
}

@media (max-width:860px){
  .contact__grid{ grid-template-columns:1fr; gap:48px; }
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer{
  position:relative;
  z-index:1;
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:32px 48px;
  border-top:1px solid var(--line);
  font-size:0.72rem;
  color:var(--ink-faint);
}
.footer__top{ transition:color .3s; }
.footer__top:hover{ color:var(--cyan); }

@media (max-width:860px){
  .footer{ padding:24px; flex-direction:column; gap:12px; text-align:center; }
}

/* focus visibility for accessibility */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
}