/* Visual refresh — the original stylesheet remains below this layer for easy rollback. */
:root {
  --ink: #111827;
  --ink-soft: #485468;
  --paper: #f5f8fb;
  --surface: rgba(255, 255, 255, .88);
  --line: #dce6ef;
  --blue: #358dd0;
  --blue-deep: #17679e;
  --orange: #ffb21b;
  --shadow: 0 22px 60px rgba(34, 75, 107, .10);
}

html { scroll-behavior: smooth; }

body {
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 2%, rgba(84, 173, 226, .14), transparent 28rem),
    radial-gradient(circle at 88% 13%, rgba(255, 178, 27, .10), transparent 22rem),
    var(--paper);
  text-align: left;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  width: min(100% - 40px, 1180px);
  max-width: none;
  padding: 0 0 72px;
}

.hero {
  position: relative;
  isolation: isolate;
  min-height: 570px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  left: auto;
  width: 100%;
  margin: 0 0 32px;
  padding: 58px 28px;
  text-align: center;
  transform: none;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border: 1px solid rgba(255,255,255,.9);
  border-radius: 36px;
  background:
    linear-gradient(135deg, rgba(255,255,255,.94), rgba(255,255,255,.66)),
    linear-gradient(115deg, rgba(53,141,208,.12), rgba(255,178,27,.08));
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.hero::after {
  content: "";
  position: absolute;
  top: 22px;
  left: 50%;
  width: 480px;
  height: 480px;
  z-index: -1;
  transform: translateX(-50%);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(73,166,221,.15), transparent 68%);
  filter: blur(8px);
}

.hero-title-row {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 18px;
  color: var(--blue-deep);
  font-size: 16px;
  font-weight: 750;
  letter-spacing: .13em;
  text-transform: uppercase;
}
.eyebrow span,
.eyebrow::after {
  width: 24px;
  height: 2px;
  background: var(--orange);
}
.eyebrow::after { content: ""; }

h1 {
  max-width: none;
  margin: 0;
  color: var(--ink);
  font-size: clamp(42px, 4vw, 55px);
  line-height: 1.09;
  letter-spacing: -.04em;
  text-align: center;
}

h1 span {
  display: block;
  white-space: nowrap;
}

.hero-lead {
  max-width: 700px;
  margin: 26px auto 0;
  color: var(--ink-soft);
  font-size: clamp(16px, 1.8vw, 20px);
  line-height: 1.65;
}

.authors {
  margin-top: 18px;
  color: #7890a5;
  font-size: 13px;
  font-weight: 650;
  letter-spacing: .06em;
}

.authors-block {
  width: min(100%, 1040px);
  margin: 30px auto 0;
  padding-top: 24px;
  border-top: 1px solid rgba(93, 126, 151, .20);
}

.author-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 12px 26px;
}

.author {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--ink);
  font-size: 16px;
  font-weight: 720;
  text-decoration: none;
  transition: color .2s ease, transform .2s ease;
}

.author:hover { color: var(--blue-deep); transform: translateY(-1px); }
.author sup,
.affiliations sup { color: var(--blue-deep); font-size: .7em; font-weight: 800; }

.orcid-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 19px;
  height: 19px;
  margin-left: 2px;
  color: #fff;
  border-radius: 50%;
  background: #a6ce39;
  font-size: 9px;
  font-weight: 800;
  letter-spacing: -.06em;
}

.affiliations {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 7px 24px;
  margin-top: 18px;
  color: #65778a;
  font-size: 13px;
  line-height: 1.5;
}

.links-row { display: flex; gap: 10px; margin: 28px 0 0; }
.btn-black {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 46px;
  margin: 0;
  padding: 0 18px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  background: var(--ink);
  box-shadow: 0 8px 20px rgba(17,24,39,.14);
  font-size: 14px;
  font-weight: 700;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.btn-black:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(17,24,39,.2); }
.btn-black span { opacity: .65; font-size: 11px; }
.btn-black.is-disabled {
  color: var(--ink-soft);
  border-color: var(--line);
  background: rgba(255,255,255,.72);
  box-shadow: none;
  pointer-events: none;
}

main { display: block; }

.grid {
  position: relative;
  gap: 12px;
  padding: 12px;
  border: 1px solid rgba(255,255,255,.9);
  border-radius: 26px;
  background: rgba(255,255,255,.72);
  box-shadow: var(--shadow);
  width: min(100%, 1100px);
  margin-inline: auto;
}

.video-card {
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: 17px;
  background: #eaf0f4;
}
.video-card video, .video-card img { border-radius: 17px !important; }
.video-card::after {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 6px 10px;
  color: #fff;
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 999px;
  background: rgba(10,25,38,.58);
  backdrop-filter: blur(8px);
  font-size: 10px;
  font-weight: 750;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.video-card:nth-child(1)::after { content: "Trajectory 01"; }
.video-card:nth-child(2)::after { content: "Control setup"; }
.video-card:nth-child(3)::after { content: "Trajectory 02"; }
#gallery .video-card:nth-child(2) img { object-fit: fill !important; }

.section-description,
.abstract-description,
.method-description,
.ablation-description,
.comparison-description {
  color: var(--ink-soft) !important;
  font-size: 16px;
  line-height: 1.85;
}

.section-description {
  width: min(100%, 1080px);
  max-width: 1080px;
  margin: 32px auto 88px;
  padding: 0 8px;
}
.section-description strong { color: var(--blue-deep); }

.abstract-section,
.method-section,
.ablation-section,
.comparison-section,
.more-result-section {
  position: relative;
  margin: 0 0 34px;
  padding: clamp(28px, 5vw, 56px);
  border: 1px solid var(--line);
  border-radius: 26px;
  background: var(--surface);
  box-shadow: 0 12px 34px rgba(34,75,107,.055);
}

.abstract-title,
.method-title,
.ablation-title {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 28px !important;
  color: var(--ink);
  font-size: clamp(26px, 3vw, 38px);
  line-height: 1.15;
  letter-spacing: -.025em;
}
.abstract-title::before,
.method-title::before,
.ablation-title::before {
  content: "";
  width: 8px;
  height: 30px;
  flex: 0 0 auto;
  border-radius: 999px;
  background: linear-gradient(var(--blue), var(--orange));
}

.method-image {
  margin: 32px 0 26px;
  padding: clamp(12px, 2vw, 22px);
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #fff;
}
.method-image img { border-radius: 12px; }

.case-wrapper {
  gap: 18px;
  margin: 20px 0 !important;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #f8fafc;
}
.case-wrapper-ablation1 { top: 0 !important; }
.case-label {
  height: auto;
  min-width: 30px;
  color: var(--blue-deep);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.ablation-videos { gap: 18px; }
.ablation-videos.four-videos { gap: 22px; }
.ablation-videos.paired-videos {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  width: 100%;
  gap: 18px;
}
.paired-videos .video-item-container,
.paired-videos .video-item { width: 100%; min-width: 0; }
.ablation-videos.paired-videos .video-item video {
  width: 100%;
  max-width: none;
  height: auto;
}
.video-pair { gap: 8px; }
.ablation-videos .video-item video {
  border: 1px solid rgba(17,24,39,.08);
  border-radius: 12px;
  background: #e8edf1;
  box-shadow: 0 6px 18px rgba(32,54,70,.08);
}
.video-label {
  max-width: 300px;
  color: var(--ink-soft);
  font-size: 12px;
  line-height: 1.35 !important;
}
.ablation-description { margin: 28px 4px 64px; }
.comparison-section .video-container { margin: 0 0 26px; }
.comparison-section .video-container video { border-radius: 16px !important; box-shadow: var(--shadow); }
.combination-section .video-container { margin-bottom: 0; }
.combination-section .video-container video { display: block; width: 100%; height: auto; }
.more-result-section { margin-top: 34px; }

footer {
  margin: 44px 0 0;
  padding-top: 26px;
  border-top: 1px solid var(--line);
  color: #7b8b9a;
}

@media (max-width: 900px) {
  .hero { min-height: 650px; margin-bottom: 30px; }
  h1 { font-size: clamp(31px, 5vw, 42px); }
  .grid { grid-template-columns: 1fr; }
  .video-card { aspect-ratio: 16 / 10; }
  .ablation-videos, .ablation-videos.four-videos, .ablation-videos.three-videos {
    flex-wrap: wrap;
  }
  .case-wrapper { align-items: stretch; }
  .case-label {
    width: 100%;
    writing-mode: horizontal-tb;
    transform: none;
    justify-content: flex-start;
  }
}

@media (max-width: 620px) {
  .wrap { width: min(100% - 24px, 1180px); padding-bottom: 40px; }
  .hero { width: 100%; min-height: 760px; padding-inline: 22px; }
  .hero::before { inset: 12px; border-radius: 24px; }
  .eyebrow { font-size: 13px; }
  h1 { font-size: 34px; text-align: center; }
  h1 span { white-space: normal; }
  .authors-block { margin-top: 24px; padding-top: 20px; }
  .author-list { gap: 10px 18px; }
  .author { font-size: 14px; }
  .affiliations { display: grid; gap: 7px; font-size: 12px; }
  .hero-lead { font-size: 15px; }
  .links-row { flex-wrap: wrap; justify-content: center; }
  .grid { padding: 7px; border-radius: 20px; }
  .video-card, .video-card video, .video-card img { border-radius: 14px !important; }
  .section-description { margin-bottom: 58px; padding: 0 8px; font-size: 15px; }
  .abstract-section, .method-section, .ablation-section, .comparison-section, .more-result-section {
    padding: 24px 18px;
    border-radius: 20px;
  }
  .abstract-title, .method-title, .ablation-title { align-items: flex-start; font-size: 25px; }
  .case-wrapper { padding: 12px; }
  .video-pair { flex-wrap: wrap; justify-content: center; }
  .ablation-videos.paired-videos { grid-template-columns: 1fr; }
  .ablation-videos .video-item video { width: 100%; height: auto; max-width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}