:root {
  --ink: #17201f;
  --muted: #5d6a67;
  --line: #d9e2df;
  --paper: #f7faf8;
  --panel: #ffffff;
  --green: #1f7a5a;
  --blue: #245ca8;
  --amber: #b86f18;
  --dark: #111716;
  --shadow: 0 18px 48px rgba(23, 32, 31, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  line-height: 1.65;
  letter-spacing: 0;
}

a {
  color: var(--green);
}

a:hover {
  color: var(--blue);
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding: 0 32px;
  background: rgba(247, 250, 248, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.topbar-brand {
  color: var(--ink);
  font-size: 1.05rem;
  font-weight: 800;
}

.topbar-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 18px;
  font-size: 0.95rem;
  font-weight: 650;
}

.topbar-links a {
  color: var(--muted);
}

.topbar-links a:hover {
  color: var(--ink);
}

.paper-hero {
  background:
    linear-gradient(120deg, rgba(31, 122, 90, 0.13), rgba(36, 92, 168, 0.08) 46%, rgba(184, 111, 24, 0.1)),
    var(--paper);
  border-bottom: 1px solid var(--line);
}

.paper-hero .hero-body {
  padding: 64px 24px 46px;
}

.paper-hero .container {
  max-width: 1560px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(520px, 1.08fr);
  gap: 42px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--green);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.publication-title {
  max-width: 960px;
  margin: 0;
  color: var(--ink);
  font-size: 2.75rem;
  font-weight: 850;
  line-height: 1.08;
}

.publication-authors {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  margin-top: 24px;
  color: var(--ink);
  font-size: 1.04rem;
  font-weight: 650;
}

.author-block {
  display: inline-block;
}

.publication-affiliations {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.96rem;
}

.hero-summary {
  max-width: 720px;
  margin: 24px 0 0;
  color: #34413f;
  font-size: 1.03rem;
}

.publication-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.paper-button {
  min-height: 42px;
  border-radius: 8px;
  font-weight: 750;
}

.paper-button .icon {
  margin-right: 4px;
}

.hero-figure {
  margin: 0;
}

.hero-figure img,
.figure-showcase img {
  width: 100%;
  height: auto;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.hero-figure figcaption,
.figure-showcase figcaption {
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.94rem;
}

.section {
  padding: 64px 24px;
  scroll-margin-top: 82px;
}

.section:nth-of-type(even) {
  background: #ffffff;
}

.section-heading {
  max-width: 820px;
  margin-bottom: 30px;
}

.section-heading p:last-child {
  margin-top: 10px;
  color: var(--muted);
}

.section-title {
  margin: 0;
  color: var(--ink);
  font-size: 2rem;
  font-weight: 820;
  line-height: 1.18;
}

.paper-text {
  color: #33413f;
  font-size: 1.02rem;
}

.paper-text p:not(:last-child) {
  margin-bottom: 1rem;
}

.hardware-note {
  margin: -8px 0 24px;
  padding: 14px 16px;
  color: #33413f;
  background: rgba(31, 122, 90, 0.08);
  border: 1px solid rgba(31, 122, 90, 0.18);
  border-radius: 8px;
}

.hardware-note strong {
  color: var(--ink);
}

.highlight-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.highlight-item {
  min-height: 220px;
  padding: 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.highlight-index {
  color: var(--amber);
  font-size: 0.82rem;
  font-weight: 850;
}

.highlight-item h3 {
  margin: 16px 0 8px;
  color: var(--ink);
  font-size: 1.12rem;
  font-weight: 800;
}

.highlight-item p {
  margin: 0;
  color: var(--muted);
}

.primary-video-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.video-card {
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 12px 28px rgba(23, 32, 31, 0.08);
}

.video-card-wide {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  align-items: stretch;
}

.video-frame,
.subvideo-item video {
  background: #0b1110;
}

.video-frame video {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: contain;
}

.video-copy {
  padding: 20px;
}

.video-label {
  margin: 0 0 6px;
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 850;
  text-transform: uppercase;
}

.video-copy h3 {
  margin: 0 0 8px;
  font-size: 1.18rem;
  font-weight: 800;
}

.video-copy p:last-child {
  margin: 0;
  color: var(--muted);
}

.case-block {
  padding-top: 30px;
  border-top: 1px solid var(--line);
}

.case-block + .case-block {
  margin-top: 42px;
}

.case-heading {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 18px;
}

.case-number {
  display: grid;
  flex: 0 0 44px;
  width: 44px;
  height: 44px;
  place-items: center;
  color: #ffffff;
  background: var(--green);
  border-radius: 8px;
  font-weight: 850;
}

.case-heading h3 {
  margin: 0 0 2px;
  font-size: 1.28rem;
  font-weight: 820;
}

.case-heading p {
  margin: 0;
  color: var(--muted);
}

.subvideo-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.subvideo-item {
  margin: 0;
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.subvideo-item video {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: contain;
}

.subvideo-item figcaption {
  padding: 12px 14px;
  color: #33413f;
  font-size: 0.94rem;
  font-weight: 700;
}

.figure-showcase {
  margin: 0;
}

.figure-showcase-large {
  margin-bottom: 24px;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.result-metric {
  padding: 22px;
  background: var(--dark);
  border-radius: 8px;
}

.result-metric span {
  color: #ffffff;
  font-size: 1.7rem;
  font-weight: 850;
}

.result-metric p {
  margin: 6px 0 0;
  color: #c7d5d1;
  font-weight: 650;
}

.result-note {
  max-width: 900px;
  margin-top: 22px;
}

.bibtex {
  overflow-x: auto;
  margin-top: 18px;
  padding: 20px;
  color: #e8f3ef;
  background: #101716;
  border-radius: 8px;
  font-size: 0.95rem;
  line-height: 1.55;
}

.footer {
  padding: 30px 24px;
  color: var(--muted);
  background: #ffffff;
  border-top: 1px solid var(--line);
  text-align: center;
}

.footer p {
  margin: 0;
}

@media (max-width: 1024px) {
  .hero-grid,
  .video-card-wide {
    grid-template-columns: 1fr;
  }

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

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

@media (max-width: 720px) {
  .topbar {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
    padding: 16px 20px;
  }

  .topbar-links {
    justify-content: flex-start;
    gap: 10px 16px;
  }

  .paper-hero .hero-body {
    padding: 42px 20px 34px;
  }

  .section {
    padding: 46px 20px;
  }

  .publication-title {
    font-size: 1.82rem;
  }

  .section-title {
    font-size: 1.52rem;
  }

  .publication-authors,
  .publication-affiliations,
  .publication-links {
    gap: 8px 12px;
  }

  .primary-video-grid,
  .highlight-grid,
  .subvideo-grid,
  .method-grid,
  .result-grid {
    grid-template-columns: 1fr;
  }

  .highlight-item {
    min-height: 0;
  }

  .case-heading {
    gap: 12px;
  }

  .result-metric span {
    font-size: 1.45rem;
  }
}