/* ==========================================================================
   Scientific Discovery · Nikhil Abhyankar
   Deep navy page with light text; Inter throughout, like the project pages.
   ========================================================================== */

:root {
  color-scheme: dark;

  --text-primary: #E4ECF3;
  --text-body: #C8D5E1;
  --text-secondary: #A5B6C7;
  --text-light: #7F93A7;
  --accent: #8CC4EE;

  --background-primary: #09141F;
  --background-secondary: #0C1A28;
  --surface: #0F2031;
  --surface-raised: #132A40;
  --surface-hover: #1A3550;
  --border-color: #1C3044;
  --border-strong: #2B4760;

  --button-bg: #A9D3EF;
  --button-hover: #C7E3F6;
  --button-ink: #07172A;

  --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.4);
  --shadow-md: 0 4px 10px -2px rgb(0 0 0 / 0.45);
  --shadow-lg: 0 12px 24px -6px rgb(0 0 0 / 0.55);
  --shadow-xl: 0 24px 48px -12px rgb(0 0 0 / 0.65);

  --border-radius: 12px;
  --border-radius-lg: 16px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

  --font: "Inter", "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
  background: var(--background-primary);
}

body {
  margin: 0;
  background: var(--background-primary);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}

img, svg { max-width: 100%; }
img { display: block; height: auto; }
a { color: inherit; }
p { margin: 0; }
button { font: inherit; color: inherit; }
h1, h2, h3 { margin: 0; text-wrap: balance; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }

.wrap {
  width: 100%;
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 40px);
}

.skip {
  position: absolute;
  left: 12px;
  top: -64px;
  z-index: 100;
  padding: 10px 16px;
  border-radius: var(--border-radius);
  background: var(--button-bg);
  color: var(--button-ink);
  font-weight: 600;
  text-decoration: none;
  transition: top 0.2s;
}
.skip:focus { top: 12px; }

.eyebrow {
  margin-bottom: 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0 1.15rem;
  border: 1px solid transparent;
  border-radius: var(--border-radius);
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: var(--transition);
}
.btn svg { width: 16px; height: 16px; flex: none; }
.btn--sm { min-height: 40px; padding: 0 0.95rem; font-size: 0.88rem; }

/* primary */
.btn--dark {
  background: var(--button-bg);
  color: var(--button-ink);
  box-shadow: var(--shadow-md);
}
.btn--dark:hover {
  background: var(--button-hover);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

/* secondary */
.btn--light {
  background: var(--surface-raised);
  color: var(--text-primary);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}
.btn--light:hover {
  background: var(--surface-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  flex: none;
  padding: 0;
  border: 1px solid var(--border-strong);
  border-radius: var(--border-radius);
  background: var(--surface-raised);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: var(--transition);
}
.icon-btn:hover { background: var(--surface-hover); box-shadow: var(--shadow-md); }
.icon-btn svg { width: 18px; height: 18px; }

.venue {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: var(--surface-raised);
  color: var(--text-body);
  font-size: 0.76rem;
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
}

/* ---------- Navigation ---------- */
.nav {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 50;
  background: rgba(9, 20, 31, 0.88);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.nav.is-scrolled { border-bottom-color: var(--border-color); box-shadow: var(--shadow-sm); }

.nav__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-right: auto;
  min-width: 0;
  text-decoration: none;
}
.brand__name {
  overflow: hidden;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--text-primary);
  white-space: nowrap;
  text-overflow: ellipsis;
}

.nav__links { display: flex; gap: 2px; }
.nav__links a {
  padding: 9px 12px;
  border-radius: 10px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
}
.nav__links a:hover { color: var(--text-primary); background: var(--surface-raised); }

.nav__actions { display: flex; align-items: center; gap: 10px; }
.only-narrow { display: none; }

@media (max-width: 860px) {
  .nav__links { display: none; }
}
@media (max-width: 560px) {
  .nav__inner { height: 62px; gap: 10px; }
  .brand__name { font-size: 1rem; }
  .only-wide { display: none; }
  .only-narrow { display: inline; }
}

/* ---------- Hero ---------- */
.hero { padding-block: clamp(3rem, 7vw, 5.5rem) clamp(3.5rem, 7.5vw, 6rem); }

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  gap: clamp(2.5rem, 5vw, 4.5rem);
  align-items: center;
}

.hero h1 {
  font-size: clamp(2.3rem, 1.45rem + 3vw, 3.6rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--text-primary);
}

.lede {
  max-width: 36em;
  margin: 1.4rem 0 2rem;
  font-size: clamp(1.05rem, 1rem + 0.25vw, 1.16rem);
  line-height: 1.7;
  color: var(--text-secondary);
}

.papers {
  padding: 1.25rem 1.25rem 0.6rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-lg);
}
.papers__title {
  padding: 0 0.5rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
}
.papers__list { margin: 0; padding: 0; list-style: none; }
.papers__list li { border-top: 1px solid var(--border-color); }
.papers__list a {
  display: grid;
  grid-template-columns: 7.2rem minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.9rem;
  margin: 0.3rem 0;
  padding: 0.7rem 0.5rem;
  border-radius: 10px;
  text-decoration: none;
  transition: var(--transition);
}
.papers__list a:hover { background: var(--surface-raised); }
.papers__list .venue { justify-self: start; }
.papers__main { display: grid; min-width: 0; }
.papers__name { font-size: 1.05rem; font-weight: 700; color: var(--text-primary); }
.papers__what { font-size: 0.88rem; color: var(--text-secondary); }
.papers__arrow { width: 18px; height: 18px; color: var(--text-light); transition: var(--transition); }
.papers__list a:hover .papers__arrow { color: var(--accent); transform: translateX(3px); }

@media (max-width: 920px) {
  .hero__grid { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 480px) {
  .papers { padding-inline: 0.75rem; }
  .papers__list a { grid-template-columns: minmax(0, 1fr) auto; row-gap: 0.4rem; }
  .papers__list .venue { grid-column: 1; }
  .papers__main { grid-column: 1; }
  .papers__arrow { grid-column: 2; grid-row: 1 / span 2; }
}

/* ---------- Sections ---------- */
.section { padding-block: clamp(4rem, 8vw, 6.5rem); }
.section--alt {
  background: var(--background-secondary);
  border-block: 1px solid var(--border-color);
}
.section-head {
  max-width: 50rem;
  margin: 0 auto clamp(2.5rem, 5vw, 3.5rem);
  text-align: center;
}
.section-head h2, .about__text h2 {
  font-size: clamp(1.8rem, 1.4rem + 1.3vw, 2.3rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

/* ---------- The loop ---------- */
.loop {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.5fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.loop__diagram { margin: 0; }
.loop__diagram svg { display: block; width: 100%; height: auto; overflow: visible; }

.loop-ring { fill: none; stroke: var(--border-strong); stroke-width: 1; stroke-dasharray: 2 5; }
.loop-arc { fill: none; stroke: var(--text-light); stroke-width: 1.6; marker-end: url(#loop-arrow); }
.loop-arrowhead { fill: var(--text-light); }
.loop-node circle { fill: var(--surface); stroke: var(--text-primary); stroke-width: 1.5; }
.loop-node text {
  font: 600 13px var(--font);
  fill: var(--text-primary);
  text-anchor: middle;
  dominant-baseline: central;
}
.loop-node--accent circle { stroke: var(--accent); stroke-width: 2; }
.loop-node--accent text { fill: var(--accent); }
.loop-label { font: 600 15px var(--font); fill: var(--text-body); }
.loop-center {
  font: 800 27px var(--font);
  letter-spacing: -0.02em;
  fill: var(--text-primary);
  text-anchor: middle;
}
.loop-center-sub {
  font: 600 10.5px var(--font);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  fill: var(--text-light);
  text-anchor: middle;
}
.loop-orbiter {
  transform-box: view-box;
  transform-origin: 240px 200px;
  animation: orbit 16s linear infinite;
}
.loop-orbiter circle { fill: var(--accent); }
@keyframes orbit { to { transform: rotate(360deg); } }

.steps {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1.6rem, 3vw, 2.4rem) clamp(1.4rem, 3vw, 2.6rem);
  margin: 0;
  padding: 0;
  list-style: none;
}
.step { padding-top: 1rem; border-top: 2px solid var(--text-light); }
.step--accent { border-top-color: var(--accent); }
.step__num {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--text-light);
}
.step--accent .step__num { color: var(--accent); }
.step h3 {
  margin: 0.35rem 0 0.45rem;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
}
.step > p:not(.step__num) {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

@media (max-width: 1000px) {
  .loop { grid-template-columns: minmax(0, 1fr); }
  .loop__diagram { width: min(100%, 400px); margin-inline: auto; }
}
@media (max-width: 640px) {
  .steps { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- Project cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(20px, 2.5vw, 32px);
}
@media (max-width: 900px) {
  .cards { grid-template-columns: minmax(0, 1fr); }
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-xl);
}

/* diagrams stay on white, like printed figures */
.card__fig {
  position: relative;
  z-index: 2;
  display: block;
  margin: 14px 14px 0;
  padding: 0;
  aspect-ratio: 19 / 10;
  overflow: hidden;
  border: 0;
  border-radius: var(--border-radius);
  background: #ffffff;
  cursor: zoom-in;
}
.card__fig img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 10px 12px;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}
.card:hover .card__fig img { transform: scale(1.02); }

.zoom {
  position: absolute;
  right: 10px;
  bottom: 10px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 8px;
  background: rgba(7, 23, 42, 0.86);
  color: #ffffff;
  font-size: 0.74rem;
  font-weight: 600;
  opacity: 0;
  transform: translateY(4px);
  transition: var(--transition);
}
.zoom svg { width: 13px; height: 13px; }
.card__fig:hover .zoom, .card__fig:focus-visible .zoom { opacity: 1; transform: none; }
@media (hover: none) {
  .zoom { opacity: 0.94; transform: none; }
}

.card__body {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 0.55rem;
  padding: 1.15rem 1.4rem 1.4rem;
}
.card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 0.75rem;
}
.card__name {
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}
.card__title {
  font-size: 0.98rem;
  font-weight: 500;
  line-height: 1.5;
  color: var(--text-secondary);
}
.card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: auto;
  padding-top: 0.75rem;
}
.card__actions .btn { padding: 0 0.95rem; font-size: 0.9rem; }
.card__actions .btn--light { position: relative; z-index: 2; }
@media (max-width: 560px) {
  .card__actions .btn--dark { flex: 1 0 100%; }
  .card__actions .btn--light { flex: 1 1 0; padding: 0 0.6rem; }
}

/* the whole card opens the project page; the figure and other buttons sit above */
.stretched::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  border-radius: var(--border-radius-lg);
}
.btn--dark.stretched:hover { transform: none; }

/* ---------- About ---------- */
.about {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}
.about__photo {
  width: 100%;
  max-width: 240px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 4px solid var(--surface-raised);
  border-radius: 50%;
  box-shadow: var(--shadow-lg);
}
.about__text .eyebrow { margin-bottom: 0.5rem; }
.about__role {
  margin-top: 0.35rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-body);
}
.about__bio {
  max-width: 44em;
  margin-top: 0.9rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.facts {
  max-width: 44rem;
  margin: 1.5rem 0 1.75rem;
  border-top: 1px solid var(--border-color);
}
.facts__row {
  display: grid;
  grid-template-columns: 10.5rem minmax(0, 1fr);
  gap: 1rem;
  align-items: center;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--border-color);
}
.facts dt {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
}
.facts dd { margin: 0; font-weight: 500; color: var(--text-primary); }
.facts dd a { text-decoration-color: var(--border-strong); text-underline-offset: 3px; }
.facts dd a:hover { color: var(--accent); text-decoration-color: currentColor; }

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.tags li {
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: var(--surface);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

.about__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
}
.social { display: inline-flex; gap: 0.6rem; }
.social a {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border-strong);
  border-radius: var(--border-radius);
  background: var(--surface);
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.social a:hover { color: var(--text-primary); background: var(--surface-raised); transform: translateY(-2px); }
.social svg { width: 18px; height: 18px; }

@media (max-width: 780px) {
  .about { grid-template-columns: minmax(0, 1fr); }
  .about__photo { max-width: 180px; }
}
@media (max-width: 520px) {
  .facts__row { grid-template-columns: minmax(0, 1fr); gap: 0.4rem; }
}

/* ---------- Footer ---------- */
.footer { padding-block: 2rem 2.5rem; }
.footer__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  font-size: 0.88rem;
  color: var(--text-light);
}
.footer a { color: var(--text-secondary); text-decoration: none; }
.footer a:hover { color: var(--text-primary); text-decoration: underline; text-underline-offset: 3px; }

/* ---------- Dialogs ---------- */
dialog {
  max-width: none;
  max-height: none;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--text-primary);
}
dialog::backdrop {
  background: rgba(2, 8, 15, 0.8);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}

.lightbox { width: min(1360px, calc(100vw - 32px)); }
.lightbox__panel {
  overflow: hidden;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-xl);
}
.lightbox__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px 10px 20px;
  border-bottom: 1px solid var(--border-color);
}
.lightbox__title { font-size: 1.15rem; font-weight: 700; }
.lightbox__controls { display: flex; align-items: center; gap: 8px; }
.lightbox__open {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-right: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-decoration: none;
}
.lightbox__open:hover { color: var(--text-primary); }
.lightbox__open svg { width: 14px; height: 14px; }
.lightbox__stage { background: #ffffff; }
.lightbox__img {
  width: 100%;
  max-height: calc(100vh - 190px);
  max-height: calc(100dvh - 190px);
  object-fit: contain;
  padding: clamp(8px, 2vw, 22px);
}
.lightbox__cap {
  max-width: 70em;
  padding: 12px 20px 16px;
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--text-secondary);
}
@media (max-width: 560px) {
  .lightbox__open { display: none; }
}

.share { width: min(380px, calc(100vw - 32px)); }
.share__panel {
  position: relative;
  padding: 28px 24px 24px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  background: var(--surface);
  text-align: center;
  box-shadow: var(--shadow-xl);
}
.share__close { position: absolute; top: 12px; right: 12px; }
.share__title { font-size: 1.3rem; font-weight: 700; letter-spacing: -0.01em; }
.share__qr {
  width: min(232px, 100%);
  margin: 18px auto 14px;
  padding: 12px;
  border-radius: var(--border-radius);
  background: #ffffff;
}
.share__qr:empty { display: none; }
.share__qr svg { display: block; width: 100%; height: auto; }
.share__url {
  margin-bottom: 16px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  overflow-wrap: anywhere;
  user-select: all;
}
.share__copy { width: 100%; }

/* ---------- Motion preferences ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .card:hover, .btn:hover, .social a:hover { transform: none; }
}