:root {
  --bg: #ffffff;
  --surface: #f6f8fb;
  --surface-2: #eef3f8;
  --text: #172033;
  --muted: #5d6879;
  --line: #dce3ec;
  --blue: #2f70b7;
  --blue-dark: #23598f;
  --green: #327a3f;
  --rose: #c45e60;
  --shadow: 0 14px 40px rgba(26, 43, 69, 0.10);
  --radius: 18px;
  --container: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img, video { display: block; max-width: 100%; }
a { color: var(--blue-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre { font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; }

.container { width: min(calc(100% - 40px), var(--container)); margin: 0 auto; }
.container.narrow { max-width: 900px; }
.section { padding: 88px 0; scroll-margin-top: 72px; }
.section-soft { background: var(--surface); border-top: 1px solid #edf1f5; border-bottom: 1px solid #edf1f5; }

.site-header {
  position: sticky; top: 0; z-index: 20;
  background: rgba(255,255,255,0.92);
  border-bottom: 1px solid rgba(220,227,236,.85);
  backdrop-filter: blur(14px);
}
.nav { min-height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { font-weight: 800; letter-spacing: .08em; color: var(--text); }
.nav-links { display: flex; gap: 22px; align-items: center; }
.nav-links a { color: var(--muted); font-weight: 600; font-size: .95rem; }
.nav-links a:hover { color: var(--blue); text-decoration: none; }
.nav-toggle { display: none; border: 1px solid var(--line); background: white; border-radius: 10px; padding: 8px 12px; }

.hero { padding: 110px 0 72px; text-align: center; background: radial-gradient(circle at 50% 0%, #eef6ff 0, #ffffff 55%); }
.hero-inner { max-width: 1050px; }
.eyebrow { margin: 0 0 12px; color: var(--blue); text-transform: uppercase; letter-spacing: .13em; font-size: .78rem; font-weight: 800; }
h1 { margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: clamp(1.4rem, 3vw, 2.3rem); line-height: 1.15; letter-spacing: -.02em; }
.title-line { display: block; white-space: nowrap; }
h2 { margin: 0 0 14px; font-family: Georgia, "Times New Roman", serif; font-size: clamp(2rem, 4vw, 3.4rem); line-height: 1.12; letter-spacing: -.02em; }
h3 { margin: 0 0 8px; font-size: 1.16rem; }
.authors { margin: 26px 0 0; font-size: 1.18rem; font-weight: 700; }
.affiliation { margin: 4px 0 0; color: var(--muted); }
.hero-summary { max-width: 800px; margin: 28px auto 0; font-size: 1.13rem; color: var(--muted); }
.button-row { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-width: 112px; padding: 11px 17px; border-radius: 999px; border: 1px solid var(--line); background: white; color: var(--text); font-weight: 750; box-shadow: 0 5px 16px rgba(36,57,83,.06); }
.button:hover { transform: translateY(-1px); text-decoration: none; border-color: #b7c6d9; }
.button.primary { background: var(--text); color: white; border-color: var(--text); }
.button.disabled { opacity: .48; pointer-events: none; }

.section-heading { max-width: 850px; margin: 0 auto 42px; text-align: center; }
.section-heading.compact { margin-bottom: 24px; }
.section-heading > p:last-child { color: var(--muted); font-size: 1.08rem; margin: 0; }
.abstract-text { font-family: Georgia, "Times New Roman", serif; font-size: 1.16rem; text-align: justify; }

.card { background: white; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.video-frame { background: #0c111b; border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.video-frame video { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.caption { margin: 14px 0 0; text-align: center; color: var(--muted); font-size: .92rem; }

.motivation-grid { display: grid; grid-template-columns: 1.25fr .75fr; gap: 24px; align-items: stretch; }
.media-card { padding: 14px; }
.media-card img { width: 100%; height: 100%; object-fit: contain; border-radius: 12px; background: white; }
.media-card figcaption { margin-top: 12px; color: var(--muted); text-align: center; }
.callout { max-width: 900px; margin: 28px auto 0; padding: 20px 24px; border-left: 5px solid var(--blue); background: #eef6ff; border-radius: 0 14px 14px 0; }

.wide-figure { padding: 14px; }
.wide-figure img { width: 100%; border-radius: 12px; }
.steps-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; margin-top: 28px; }
.step-card { padding: 20px; border: 1px solid var(--line); border-radius: 14px; background: white; }
.step-card span { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--blue); color: white; font-weight: 800; margin-bottom: 12px; }
.step-card p { color: var(--muted); margin: 0; font-size: .93rem; }

.split-section { display: grid; grid-template-columns: .82fr 1.18fr; gap: 44px; align-items: center; }
.split-section.reverse { grid-template-columns: 1.2fr .8fr; }
.split-copy h2 { font-size: clamp(2rem, 3.3vw, 3rem); }
.feature-list { display: grid; gap: 12px; margin-top: 24px; }
.feature-list > div { display: grid; grid-template-columns: 170px 1fr; gap: 16px; padding-top: 12px; border-top: 1px solid var(--line); }
.feature-list strong { color: var(--text); }
.feature-list span { color: var(--muted); }
.detector-card { padding: 8px; }

/* Larger imagery in the component carousel: image left, caption right. */
.carousel .split-section { grid-template-columns: 1.55fr 1fr; align-items: center; }
.carousel .split-section .media-card img { width: 100%; height: auto; max-height: 480px; object-fit: contain; }

.carousel { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 18px; }
.carousel-viewport { overflow: hidden; }
.carousel-track { display: flex; transition: transform .45s cubic-bezier(.4, 0, .2, 1); }
.carousel-slide { flex: 0 0 100%; padding: 4px; }
.carousel-arrow { display: grid; place-items: center; width: 48px; height: 48px; flex: none; border-radius: 50%; border: 1px solid var(--line); background: white; color: var(--text); font-size: 1.5rem; line-height: 1; cursor: pointer; box-shadow: 0 5px 16px rgba(36,57,83,.08); transition: background .2s, color .2s, transform .2s; }
.carousel-arrow:hover { background: var(--blue); color: white; border-color: var(--blue); }
.carousel-arrow:active { transform: scale(.94); }
.carousel-dots { display: flex; justify-content: center; gap: 12px; margin-top: 28px; flex-wrap: wrap; }
.carousel-dot { border: 1px solid var(--line); background: white; color: var(--muted); border-radius: 999px; padding: 8px 18px; font-weight: 700; font-size: .92rem; cursor: pointer; transition: background .2s, color .2s, border-color .2s; }
.carousel-dot:hover { color: var(--blue); border-color: var(--blue); }
.carousel-dot.is-active { background: var(--text); color: white; border-color: var(--text); }

.task-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.task-card video { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; background: #e8edf3; }
.task-body { padding: 18px 20px 21px; }
.task-body p { margin: 0; color: var(--muted); }
.task-meta { display: flex; gap: 8px; margin-bottom: 10px; }
.task-meta span { font-size: .75rem; padding: 4px 8px; border-radius: 999px; color: var(--blue-dark); background: #edf5ff; font-weight: 800; }

.metrics-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-bottom: 28px; }
.metric { padding: 28px; text-align: center; }
.metric strong { display: block; font-size: 2.25rem; color: var(--blue-dark); line-height: 1.1; }
.metric span { display: block; margin-top: 8px; color: var(--muted); }
.results-block { padding: 24px; margin-top: 22px; }
.results-block h3 { margin-bottom: 18px; }
.table-scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th, td { padding: 12px 11px; border: 1px solid var(--line); text-align: center; white-space: nowrap; }
th { background: var(--surface-2); font-weight: 800; }
td:first-child, thead tr:first-child th:first-child { text-align: left; }
tr.ours td { background: #edf8ef; font-weight: 800; color: #255c2c; }

.ablation-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.ablation-card { padding: 24px; }
.ablation-card strong { font-size: 1.5rem; color: var(--rose); }
.ablation-card p { color: var(--muted); margin-bottom: 0; }
.ablation-card.accent { border-color: #9cc4a2; background: #f3fbf4; }
.ablation-card.accent strong { color: var(--green); }

.citation-box { position: relative; background: #111827; color: #e5edf7; border-radius: 16px; overflow: hidden; }
.citation-box pre { margin: 0; padding: 28px; overflow-x: auto; line-height: 1.55; }
.copy-button { position: absolute; top: 12px; right: 12px; border: 1px solid #495568; background: #1e293b; color: white; border-radius: 9px; padding: 7px 11px; cursor: pointer; }
.ack-figure { margin: 32px 0 0; }
.ack-figure img { width: 100%; border-radius: 14px; border: 1px solid var(--line); }

.footer { padding: 46px 0; text-align: center; color: var(--muted); border-top: 1px solid var(--line); }
.footer p { margin: 5px 0; }
.footer .small { font-size: .86rem; }

@media (max-width: 980px) {
  .motivation-grid, .split-section, .split-section.reverse { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: repeat(3, 1fr); }
  .task-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-list > div { grid-template-columns: 145px 1fr; }
}

@media (max-width: 720px) {
  .section { padding: 64px 0; }
  .container { width: min(calc(100% - 26px), var(--container)); }
  .hero { padding-top: 78px; }
  .nav-toggle { display: block; }
  .nav-links { display: none; position: absolute; left: 13px; right: 13px; top: 58px; flex-direction: column; align-items: stretch; padding: 14px; background: white; border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); }
  .nav-links.open { display: flex; }
  .steps-grid, .task-grid, .metrics-grid, .ablation-grid { grid-template-columns: 1fr; }
  .feature-list > div { grid-template-columns: 1fr; gap: 4px; }
  .carousel { gap: 8px; }
  .carousel-arrow { width: 40px; height: 40px; font-size: 1.25rem; }
  h1 { font-size: clamp(1.5rem, 6.4vw, 2.2rem); }
  .title-line { white-space: normal; }
  .abstract-text { text-align: left; }
}