/* ===== Design tokens ===== */
:root {
  --bg: #08070d;
  --bg-soft: #0e0c16;
  --surface: rgba(255, 255, 255, 0.035);
  --surface-strong: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);

  --text: #f4f2f8;
  --text-dim: #b7b2c6;
  --text-faint: #837e95;

  --coral: #ff7e8a;
  --coral-soft: #ff9aa2;
  --purple: #a586f0;
  --purple-soft: #c0a8f5;

  --grad: linear-gradient(100deg, #ff8a93 0%, #d98fc4 48%, #9b82ec 100%);
  --grad-soft: linear-gradient(100deg, rgba(255,138,147,.18), rgba(155,130,236,.18));

  --radius: 18px;
  --radius-lg: 26px;
  --maxw: 1180px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

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

html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
  font-family: "Inter", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* ===== Ambient background ===== */
.bg-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  z-index: -2;
  pointer-events: none;
  opacity: .55;
}
.bg-glow--1 {
  top: -18%; right: -8%;
  width: 60vw; height: 60vw;
  background: radial-gradient(circle at 70% 30%, rgba(165,134,240,.5), rgba(255,126,138,.25) 45%, transparent 70%);
}
.bg-glow--2 {
  bottom: -25%; left: -15%;
  width: 55vw; height: 55vw;
  background: radial-gradient(circle, rgba(255,126,138,.28), transparent 65%);
  opacity: .4;
}
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 80%);
}

/* ===== Navbar ===== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background .3s var(--ease), border-color .3s var(--ease), backdrop-filter .3s;
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: rgba(8, 7, 13, .72);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.nav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 16px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__logo { height: 30px; width: auto; }
.nav__links { display: flex; align-items: center; gap: 10px; }
.nav__link {
  padding: 9px 16px;
  font-size: .94rem;
  font-weight: 500;
  color: var(--text-dim);
  border-radius: 10px;
  transition: color .2s, background .2s;
}
.nav__link:hover { color: var(--text); background: var(--surface); }
.nav__link.is-active { color: var(--text); background: var(--surface-strong); }
.nav__btn {
  padding: 9px 18px;
  font-size: .94rem;
  font-weight: 600;
  border-radius: 11px;
  color: #fff;
  background: var(--grad);
  box-shadow: 0 6px 22px -8px rgba(216, 130, 200, .65);
  transition: transform .2s var(--ease), box-shadow .2s;
}
.nav__btn:hover { transform: translateY(-1px); box-shadow: 0 10px 28px -8px rgba(216, 130, 200, .8); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  font-family: "Sora", sans-serif;
  font-size: .98rem;
  font-weight: 600;
  border-radius: 13px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .2s var(--ease), box-shadow .25s, background .25s, border-color .25s;
}
.btn--primary {
  color: #fff;
  background: var(--grad);
  box-shadow: 0 10px 30px -10px rgba(216, 130, 200, .7);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 16px 38px -10px rgba(216, 130, 200, .85); }
.btn--ghost {
  color: var(--text);
  background: var(--surface);
  border-color: var(--border-strong);
}
.btn--ghost:hover { background: var(--surface-strong); border-color: var(--purple-soft); transform: translateY(-2px); }
.btn--full { width: 100%; }

/* ===== Hero ===== */
.hero {
  position: relative;
  width: 100%;
  min-height: 100vh;
  overflow: hidden;
  display: flex;
}
/* Halftone handshake — large, bleeding off the right edge */
.hero__halftone {
  position: absolute;
  top: 50%;
  right: -2%;
  transform: translateY(-50%);
  width: min(64vw, 880px);
  height: auto;
  aspect-ratio: 1.7273 / 1;
  z-index: 1;
}
.hero__halo {
  position: absolute;
  top: 38%; right: 6%;
  width: 44vw; height: 44vw;
  max-width: 640px; max-height: 640px;
  transform: translateY(-50%);
  background: radial-gradient(circle, rgba(165,134,240,.20), rgba(255,126,138,.10) 45%, transparent 70%);
  filter: blur(40px);
  z-index: 0;
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 3;
  align-self: flex-end;
  max-width: var(--maxw);
  width: 100%;
  margin: 0 auto;
  padding: 0 28px clamp(70px, 14vh, 130px);
  text-align: left;
}
.hero__eyebrow {
  display: inline-block;
  font-family: "Sora", sans-serif;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--purple-soft);
  padding: 7px 15px;
  border: 1px solid var(--border-strong);
  border-radius: 100px;
  background: rgba(8,7,13,.5);
  backdrop-filter: blur(6px);
  margin-bottom: 22px;
}
.hero__title {
  font-family: "Sora", sans-serif;
  font-size: clamp(2.1rem, 4.6vw, 3.6rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.02em;
  max-width: 16ch;
  text-shadow: 0 4px 40px rgba(8,7,13,.8);
}
.hero__actions { margin-top: 32px; display: flex; gap: 14px; flex-wrap: wrap; }

.hero__scroll {
  position: absolute;
  z-index: 3;
  bottom: 26px; left: 50%;
  transform: translateX(-50%);
  width: 24px; height: 40px;
  border: 2px solid var(--border-strong);
  border-radius: 14px;
}
.hero__scroll span {
  position: absolute;
  top: 8px; left: 50%;
  width: 4px; height: 8px;
  margin-left: -2px;
  border-radius: 4px;
  background: var(--purple-soft);
  animation: scrolldot 1.8s ease-in-out infinite;
}
@keyframes scrolldot { 0% { opacity: 0; transform: translateY(0); } 40% { opacity: 1; } 80% { opacity: 0; transform: translateY(14px); } }

/* ===== Sections ===== */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 100px 28px;
}
.section__head { max-width: 680px; margin: 0 auto 56px; text-align: center; }
.section__eyebrow {
  font-family: "Sora", sans-serif;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--coral-soft);
}
.section__title {
  margin-top: 14px;
  font-family: "Sora", sans-serif;
  font-size: clamp(1.9rem, 3.6vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.15;
}
.section__lead { margin-top: 18px; font-size: 1.06rem; color: var(--text-dim); }

/* ===== Cards ===== */
.cards { display: grid; gap: 24px; }
.cards--2 { grid-template-columns: repeat(2, 1fr); }

.card {
  position: relative;
  padding: 34px 32px;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.02));
  border: 1px solid var(--border);
  overflow: hidden;
  transition: transform .35s var(--ease), border-color .35s, box-shadow .35s;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: var(--grad);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity .35s;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 24px 60px -24px rgba(150, 110, 220, .5);
}
.card:hover::before { opacity: .9; }

.card__icon {
  width: 52px; height: 52px;
  display: grid; place-items: center;
  border-radius: 14px;
  background: var(--grad-soft);
  border: 1px solid var(--border);
  color: var(--purple-soft);
  margin-bottom: 22px;
}
.card__icon svg { width: 26px; height: 26px; }
.card__title {
  font-family: "Sora", sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -.01em;
}
.card__text { margin-top: 12px; color: var(--text-dim); }
.card__list { margin-top: 20px; list-style: none; display: grid; gap: 10px; }
.card__list li {
  position: relative;
  padding-left: 26px;
  font-size: .96rem;
  color: var(--text-dim);
}
.card__list li::before {
  content: "";
  position: absolute;
  left: 0; top: 8px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--grad);
  box-shadow: 0 0 12px rgba(200,140,210,.6);
}

.card__badge {
  display: inline-grid;
  place-items: center;
  width: 46px; height: 46px;
  border-radius: 13px;
  font-family: "Sora", sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
  color: #fff;
  margin-bottom: 20px;
}
.card--accent-coral .card__badge { background: linear-gradient(135deg, #ff7e8a, #ff9c7a); box-shadow: 0 8px 22px -8px rgba(255,126,138,.7); }
.card--accent-purple .card__badge { background: linear-gradient(135deg, #a586f0, #7c6ae0); box-shadow: 0 8px 22px -8px rgba(124,106,224,.7); }
.card--accent-coral:hover { border-color: rgba(255,126,138,.4); }
.card--accent-purple:hover { border-color: rgba(165,134,240,.4); }

/* ===== Join / Contact form ===== */
.join { padding-bottom: 110px; }
.join__inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 44px;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.015));
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.join__inner::after {
  content: "";
  position: absolute;
  top: -40%; right: -20%;
  width: 360px; height: 360px;
  background: radial-gradient(circle, rgba(165,134,240,.22), transparent 70%);
  pointer-events: none;
}
.join__head { text-align: center; margin-bottom: 36px; }
.join__head .section__title { font-size: clamp(1.7rem, 3vw, 2.4rem); }

.form { display: grid; gap: 18px; position: relative; z-index: 1; }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form__field { display: grid; gap: 8px; }
.form__field label {
  font-size: .85rem;
  font-weight: 600;
  color: var(--text-dim);
  letter-spacing: .01em;
}
.form__field input,
.form__field textarea {
  width: 100%;
  padding: 14px 16px;
  font-family: inherit;
  font-size: .98rem;
  color: var(--text);
  background: rgba(0,0,0,.25);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  transition: border-color .2s, box-shadow .2s, background .2s;
  resize: vertical;
}
.form__field input::placeholder,
.form__field textarea::placeholder { color: var(--text-faint); }
.form__field input:focus,
.form__field textarea:focus {
  outline: none;
  border-color: var(--purple);
  background: rgba(0,0,0,.4);
  box-shadow: 0 0 0 3px rgba(165,134,240,.18);
}
.form__field input:invalid:not(:placeholder-shown) {
  border-color: rgba(255,110,120,.5);
}
.form__status { text-align: center; font-size: .92rem; min-height: 20px; }
.form__status.is-ok { color: #8ce0b0; }
.form__status.is-err { color: #ff9aa2; }

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, transparent, rgba(155,130,236,.04));
}
.footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 56px 28px 32px;
  display: flex;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}
.footer__logo { height: 30px; margin-bottom: 16px; }
.footer__mission { max-width: 360px; color: var(--text-dim); font-size: .98rem; }
.footer__contact { display: flex; flex-direction: column; gap: 10px; }
.footer__heading {
  font-family: "Sora", sans-serif;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 4px;
}
.footer__link { color: var(--text-dim); font-size: .98rem; transition: color .2s; width: fit-content; }
.footer__link:hover { color: var(--purple-soft); }
.footer__bar {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 22px 28px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: .86rem;
  color: var(--text-faint);
}

/* ===== Research page ===== */
.research-main { padding-top: 76px; }
.research-hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 80px 28px 40px;
}
.research-hero__title {
  font-family: "Sora", sans-serif;
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.1;
  max-width: 16ch;
}
.research-hero__lead {
  margin-top: 22px;
  max-width: 620px;
  font-size: 1.1rem;
  color: var(--text-dim);
}
.research-section { padding-top: 56px; padding-bottom: 56px; }
.section__head--left { text-align: left; margin-left: 0; margin-right: 0; max-width: none; }
.section__lead--left { margin-left: 0; }

.cards--4 { grid-template-columns: repeat(4, 1fr); }
.card--mini { padding: 26px 24px; }
.card--mini .card__icon { width: 44px; height: 44px; margin-bottom: 16px; }
.card--mini .card__icon svg { width: 22px; height: 22px; }
.card__title--sm { font-size: 1.12rem; }
.card--mini .card__text { font-size: .94rem; }

.papers { display: grid; gap: 18px; }
.paper {
  display: block;
  position: relative;
  padding: 26px 30px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.015));
  border: 1px solid var(--border);
  transition: transform .3s var(--ease), border-color .3s, box-shadow .3s, background .3s;
}
.paper:hover {
  transform: translateX(6px);
  border-color: var(--border-strong);
  box-shadow: 0 18px 44px -24px rgba(150,110,220,.5);
}
.paper--featured {
  padding: 34px 36px;
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(165,134,240,.14), transparent 55%),
    linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.02));
  border-color: var(--border-strong);
}
.paper__tag {
  display: inline-block;
  font-family: "Sora", sans-serif;
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--coral-soft);
  margin-bottom: 12px;
}
.paper__title {
  font-family: "Sora", sans-serif;
  font-size: 1.22rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -.01em;
}
.paper--featured .paper__title { font-size: 1.5rem; }
.paper__authors { margin-top: 8px; color: var(--text); font-size: .96rem; font-weight: 500; }
.paper__venue { margin-top: 3px; color: var(--text-faint); font-size: .88rem; }
.paper__note { margin-top: 14px; color: var(--text-dim); font-size: .98rem; max-width: 70ch; }
.paper__link {
  display: inline-block;
  margin-top: 16px;
  font-weight: 600;
  font-size: .95rem;
  color: var(--purple-soft);
  transition: gap .2s;
}
.paper:hover .paper__link { color: var(--text); }

.research-note {
  margin-top: 40px;
  text-align: center;
  color: var(--text-dim);
}
.research-note a { color: var(--purple-soft); font-weight: 600; }
.research-note a:hover { color: var(--text); }

/* ===== Scroll reveal ===== */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .hero { min-height: 92vh; }
  .hero__halftone {
    top: 22%;
    right: 50%;
    transform: translate(50%, -50%);
    width: min(110vw, 560px);
    opacity: .9;
  }
  .hero__halo { top: 22%; right: 50%; transform: translate(50%, -50%); }
  .hero__content { padding-bottom: 64px; }
  .hero__title { max-width: 100%; }
  .hero__scroll { display: none; }
}
@media (max-width: 1000px) {
  .cards--4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .cards--2 { grid-template-columns: 1fr; }
  .cards--4 { grid-template-columns: 1fr; }
  .paper--featured { padding: 26px 24px; }
  .paper--featured .paper__title { font-size: 1.3rem; }
  .form__row { grid-template-columns: 1fr; }
  .section { padding: 72px 22px; }
  .join__inner { padding: 36px 24px; }
  .nav__link { display: none; }
  .footer__inner { flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; }
  html { scroll-behavior: auto; }
}