:root {
  --bg: #ffffff;
  --bg-soft: #f4f7ff;
  --text: #162033;
  --text-muted: #4a5874;
  --primary: #1e90ff;
  --accent: #ff1493;
  --green: #20b26b;
  --purple: #6b52ff;
  --line: #d6e0f2;
  --card-bg: #ffffff;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --shadow-md: 0 10px 35px rgba(30, 57, 110, 0.12);
  --shadow-sm: 0 6px 18px rgba(16, 32, 76, 0.08);
  --container: min(1140px, 92vw);
  --anim-fast: 220ms;
  --anim-base: 420ms;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Source Serif 4", Georgia, serif;
  line-height: 1.6;
}

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

a {
  color: inherit;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
  background: #fff;
  border: 2px solid var(--primary);
  padding: 0.5rem 0.8rem;
  border-radius: 8px;
  z-index: 999;
}

.container {
  width: var(--container);
  margin: 0 auto;
}

.narrow {
  max-width: 820px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 90;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid rgba(214, 224, 242, 0.7);
}

.nav-shell {
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  font-family: "Sora", sans-serif;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-decoration: none;
  font-size: 1rem;
  color: var(--text);
}

.nav {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav a {
  text-decoration: none;
  padding: 0.42rem 0.72rem;
  border-radius: 999px;
  font-family: "Sora", sans-serif;
  font-weight: 500;
  font-size: 0.78rem;
  color: var(--text-muted);
  transition: color var(--anim-fast), background var(--anim-fast), transform var(--anim-fast);
}

.nav a:hover,
.nav a:focus-visible,
.nav a.active {
  color: var(--text);
  background: rgba(30, 144, 255, 0.14);
  transform: translateY(-1px);
}

.section {
  position: relative;
  padding: clamp(3.2rem, 5vw, 5.6rem) 0;
  scroll-margin-top: 90px;
}

.section-soft {
  background: linear-gradient(180deg, var(--bg-soft), #ffffff);
}

h1,
h2,
h3,
.kicker,
.subtitle,
.tagline,
.btn,
.note,
figcaption,
th,
td,
.brand,
.nav a,
.task-id {
  font-family: "Sora", sans-serif;
}

h1,
h2,
h3 {
  line-height: 1.15;
  margin: 0 0 0.75rem;
  color: #101d3a;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.55rem, 3.2vw, 2.4rem);
  letter-spacing: -0.01em;
  margin-bottom: 1.2rem;
}

h3 {
  font-size: clamp(1rem, 2vw, 1.3rem);
}

p {
  margin: 0 0 1rem;
  color: var(--text);
}

ul {
  margin: 0.45rem 0 1.1rem;
  padding-left: 1.2rem;
}

li {
  margin-bottom: 0.34rem;
}

.hero {
  overflow: clip;
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  border-radius: 999px;
  filter: blur(36px);
  z-index: 0;
}

.hero::before {
  width: clamp(320px, 42vw, 560px);
  aspect-ratio: 1;
  right: -160px;
  top: -80px;
  background: radial-gradient(circle at 45% 45%, rgba(255, 20, 147, 0.16) 0%, rgba(255, 20, 147, 0.09) 38%, rgba(255, 255, 255, 0) 76%);
}

.hero::after {
  width: clamp(340px, 46vw, 620px);
  aspect-ratio: 1;
  left: -190px;
  bottom: -150px;
  background: radial-gradient(circle at 52% 52%, rgba(30, 144, 255, 0.14) 0%, rgba(30, 144, 255, 0.08) 40%, rgba(255, 255, 255, 0) 78%);
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.55rem;
  text-align: center;
}

.kicker {
  margin: 0 0 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.77rem;
  color: var(--primary);
  font-weight: 700;
}

.subtitle {
  font-size: clamp(1rem, 2.4vw, 1.25rem);
  color: #203056;
  margin-bottom: 0.6rem;
  font-weight: 600;
}

.tagline {
  color: var(--text-muted);
  max-width: 58ch;
  margin-bottom: 1.2rem;
}

.hero-copy {
  max-width: 920px;
}

.author-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.45rem 1rem;
  margin: 0.95rem auto 0.65rem;
  font-family: "Sora", sans-serif;
  font-size: clamp(0.95rem, 2vw, 1.08rem);
  font-weight: 600;
}

.author-list a,
.affiliation-list a {
  color: #143f80;
  text-decoration: none;
}

.author-list a:hover,
.author-list a:focus-visible,
.affiliation-list a:hover,
.affiliation-list a:focus-visible {
  color: var(--accent);
  text-decoration: underline;
}

.affiliation-list {
  max-width: 820px;
  margin: 0 auto 1.25rem;
}

.affiliation-list p {
  margin: 0.18rem 0;
  color: var(--text-muted);
  font-family: "Sora", sans-serif;
  font-size: 0.84rem;
  line-height: 1.45;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.7rem;
}

.btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0.66rem 1.1rem;
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.01em;
  transition: transform var(--anim-fast), box-shadow var(--anim-fast), border-color var(--anim-fast), background var(--anim-fast);
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-2px);
}

.btn-primary {
  color: #fff;
  border: 1px solid transparent;
  background: linear-gradient(120deg, var(--primary), var(--accent));
  box-shadow: 0 10px 24px rgba(56, 92, 177, 0.24);
}

.btn-secondary {
  border: 1px solid rgba(30, 144, 255, 0.35);
  color: #133b77;
  background: #fff;
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  border-color: rgba(255, 20, 147, 0.45);
  background: #fff9fc;
}

.grid {
  display: grid;
  gap: 1rem;
}

.two-up {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.three-up {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.modalities-row {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.modality-card {
  flex: 1 1 0;
  min-width: 0;
}

.card,
.mini-card,
.figure-card,
.table-card {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.card,
.table-card {
  padding: 1.1rem;
}

.mini-card {
  padding: 0.95rem 1rem;
  border-radius: var(--radius-md);
}

.card:hover,
.mini-card:hover,
.figure-card:hover,
.table-card:hover {
  box-shadow: var(--shadow-md);
}

.figure-card {
  position: relative;
  overflow: hidden;
  margin: 0;
  border-radius: var(--radius-lg);
  isolation: isolate;
}

.figure-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(30, 144, 255, 0.2), transparent 48%),
    radial-gradient(circle at 82% 80%, rgba(255, 20, 147, 0.2), transparent 44%),
    linear-gradient(135deg, #f3f8ff, #fff0f9);
  z-index: -1;
}

.figure-card img {
  width: 100%;
  min-height: 220px;
  object-fit: cover;
  opacity: 0.08;
}

.figure-card.compact img {
  min-height: 160px;
}

.figure-card.wide img {
  min-height: 240px;
}

#statistics .figure-card::before,
#modalities .figure-card::before,
#baselines .figure-card::before {
  display: none;
}

#statistics .figure-card img,
#modalities .figure-card img,
#baselines .figure-card img {
  opacity: 1;
  object-fit: contain;
  background: #fff;
}

.hero-figure {
  width: min(980px, 100%);
}

.hero-figure img {
  min-height: 330px;
  object-fit: contain;
  opacity: 1;
  background: #fff;
}

figcaption {
  font-size: 0.78rem;
  color: #2d456f;
  padding: 0.6rem 0.9rem 0.95rem;
}

.code-grid {
  margin-bottom: 1rem;
}

.code-card {
  background: linear-gradient(180deg, #ffffff, #fbfdff);
}

.tree-block,
.csv-block,
.bibtex-block {
  margin: 0;
  overflow-x: auto;
  padding: 0.92rem;
  border-radius: var(--radius-sm);
  border: 1px solid #d7e4fb;
  background: #f6f9ff;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.8rem;
  line-height: 1.45;
  color: #1c355c;
}

.task-card {
  position: relative;
  overflow: hidden;
}


.task-id {
  margin: 0 0 0.5rem;
  font-size: 0.76rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--purple);
}

.stat-grid p {
  font-weight: 700;
  color: #20315c;
}

.gallery-grid {
  grid-template-columns: repeat(12, minmax(0, 1fr));
}

.gallery-item {
  grid-column: span 4;
  transition: transform var(--anim-fast), box-shadow var(--anim-fast);
}

.gallery-item:hover {
  transform: translateY(-4px);
}

.video-carousel {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 3.4rem 2.4rem;
}

.carousel-track {
  position: relative;
  min-height: 420px;
}

.video-slide {
  display: none;
}

.video-slide.active {
  display: block;
}

.video-slide video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: 560px;
  background: #000;
  object-fit: contain;
}

.carousel-btn {
  position: absolute;
  top: calc(50% - 1.4rem);
  z-index: 2;
  width: 2.8rem;
  height: 2.8rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #ffffff;
  color: #13264a;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  font-family: "Sora", sans-serif;
  font-size: 2rem;
  line-height: 1;
  transition: transform var(--anim-fast), box-shadow var(--anim-fast), border-color var(--anim-fast);
}

.carousel-btn:hover,
.carousel-btn:focus-visible {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.carousel-btn-prev {
  left: 0;
}

.carousel-btn-next {
  right: 0;
}

.carousel-dots {
  position: absolute;
  left: 50%;
  bottom: 0;
  display: flex;
  gap: 0.55rem;
  transform: translateX(-50%);
}

.carousel-dots button {
  width: 0.7rem;
  height: 0.7rem;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: #b7c5df;
  cursor: pointer;
}

.carousel-dots button.active {
  width: 1.8rem;
  background: var(--primary);
}

table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border-radius: 12px;
}

th,
td {
  text-align: left;
  padding: 0.66rem 0.6rem;
  border-bottom: 1px solid #e4ebf8;
  font-size: 0.82rem;
}

th {
  color: #0f2c59;
  background: #eef4ff;
  font-weight: 700;
}

tbody tr:hover {
  background: #f8fbff;
}

.note {
  margin-top: 0.95rem;
  color: #2c436b;
  font-size: 0.9rem;
}

.highlight {
  border-left: 4px solid var(--green);
  padding-left: 0.7rem;
}

.footer {
  border-top: 1px solid var(--line);
  background: #ffffff;
  padding: 1rem 0 1.4rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.footer p,
.footer a {
  margin: 0;
  font-family: "Sora", sans-serif;
  color: #40537d;
  font-size: 0.82rem;
  text-decoration: none;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--anim-base) ease, transform var(--anim-base) ease;
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1024px) {
  .hero-grid,
  .two-up,
  .three-up {
    grid-template-columns: 1fr;
  }

  .gallery-item {
    grid-column: span 6;
  }
}

@media (max-width: 720px) {
  .nav-shell {
    padding: 0.65rem 0;
    align-items: flex-start;
    flex-direction: column;
  }

  .nav {
    width: 100%;
    overflow-x: auto;
    white-space: nowrap;
    padding-bottom: 0.15rem;
    flex-wrap: nowrap;
  }

  .section {
    padding: 2.8rem 0;
  }

  .gallery-item {
    grid-column: span 12;
  }

  .video-carousel {
    padding: 0 0 2.6rem;
  }

  .carousel-track {
    min-height: auto;
  }

  .carousel-btn {
    top: auto;
    bottom: 0;
    width: 2.35rem;
    height: 2.35rem;
    font-size: 1.65rem;
  }

  .carousel-btn-prev {
    left: calc(50% - 4.4rem);
  }

  .carousel-btn-next {
    right: calc(50% - 4.4rem);
  }

  .hero-figure img {
    min-height: 240px;
  }

  .button-row {
    gap: 0.55rem;
  }

  .btn {
    width: 100%;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0s !important;
    transition-duration: 0s !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}