/* ============================================================
   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(0.16, 0.84, 0.44, 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 0.25s var(--ease),
    height 0.25s var(--ease),
    border-color 0.25s var(--ease),
    opacity 0.25s;
}
.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 0.3s;
}
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 1px;
  background: var(--cyan);
  transition: width 0.3s 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 0.3s,
    opacity 0.3s;
}

@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 0.4s 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 0.9s var(--ease) forwards;
}
.hero__title-line:nth-child(2) {
  animation-delay: 0.12s;
}
.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 0.3s var(--ease),
    box-shadow 0.3s var(--ease),
    background 0.3s,
    border-color 0.3s;
}
.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 0.3s 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 0.8s var(--ease),
    transform 0.8s 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 0.15s 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 0.15s ease-out,
    background 0.3s;
  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 0.3s;
}
.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 0.3s,
    color 0.3s;
}
.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 0.3s,
    transform 0.3s;
}
.pub.is-hidden {
  display: none;
}

.pub__sr {
  color: var(--gold);
  font-size: 0.85rem;
  padding-top: 4px;
  font-family: var(--mono);
}

.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 0.4s var(--ease),
    opacity 0.4s 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 0.3s var(--ease),
    border-color 0.3s,
    color 0.3s;
  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: minmax(0, 1fr) auto;
    gap: 14px 16px;
    padding: 24px 0;
  }
  .pub__body {
    min-width: 0;
  }
  .pub__title {
    font-size: 1rem;
  }
  .pub__abstract {
    max-width: 100%;
    font-size: 0.88rem;
  }
  .pub__expand {
    width: 34px;
    height: 34px;
  }
}

@media (max-width: 600px) {
  .pub {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 20px 0;
  }
  .pub__sr {
    font-size: 0.78rem;
  }
  .pub__title {
    font-size: 0.95rem;
    line-height: 1.45;
  }
  .pub__meta {
    font-size: 0.69rem;
  }
  .pub__abstract {
    font-size: 0.84rem;
    line-height: 1.7;
  }
  .pub__expand {
    justify-self: start;
    margin-top: 2px;
  }
}

/* ============================================================
   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 0.3s,
    transform 0.3s 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 0.3s,
    border-color 0.3s;
}
.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 0.3s;
}
.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 0.2s var(--ease),
    font-size 0.2s var(--ease),
    color 0.2s;
  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 0.3s;
}
.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;
}