:root {
  --text: #22223b;
  --muted: #667085;
  --border: #e4e7ec;
  --panel: #ffffff;
  --panel-soft: #f8fafc;
  --blue: #2b5fad;
  --blue-dark: #4a4e69;
  --text-accent: #9a8c98;
  --shadow: 0 14px 34px rgba(15, 23, 42, 0.06);
  --radius: 20px;
  --video-controls-width: 314px;
  --fs-hero: clamp(2rem, 4vw, 2.5rem);
  --fs-section: 1.7rem;
  --fs-meta: 1.3rem;
  --fs-body: 1rem;
  --table-font-size: 0.9rem;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Jost", sans-serif;
  font-size: var(--fs-body);
  color: var(--text);
  background: #fff;
}

a {
  color: var(--blue);
  transition: color 0.18s ease;
}

a:hover {
  color: var(--blue-dark);
  text-decoration: none;
}

.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px 24px 40px;
}

.side-nav {
  position: fixed;
  left: max(16px, calc((100vw - 1100px) / 2 - 210px));
  top: 50%;
  transform: translateY(-50%);
  width: 120px;
  border-radius: var(--radius);
  z-index: 1000;
  opacity: 1;
  visibility: visible;
  transition: opacity 0.24s ease, transform 0.24s ease, visibility 0s linear 0s;
}

.side-nav.is-hidden {
  opacity: 0;
  transform: translateY(-50%) translateX(-10px);
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.24s ease, transform 0.24s ease, visibility 0s linear 0.24s;
}

.side-nav a {
  display: block;
  padding: 10px 12px;
  border-radius: 12px;
  color: var(--muted);
  font-weight: 700;
  font-size: 0.88rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-align: center;
}

.side-nav a:hover {
  background: #f5f8ff;
}

.side-nav a.active {
  background: #eef4ff;
  color: var(--blue-dark);
  font-weight: 600;
}

.content {
  display: grid;
  gap: 0;
}

.content-group {
  display: grid;
  gap: 32px;
}

.content-group-intro {
  gap: 42px;
  padding-top: 20px;
}

.content-group-main {
  gap: 56px;
}

.content-group-citation {
  padding-bottom: 64px;
}

.content-group + .content-group {
  margin-top: 136px;
  padding-top: 0;
  border-top: none;
}

.hero,
.section-card {
  background: transparent;
  border: none;
  border-radius: 0;
  box-shadow: none;
}

.hero {
  padding: 0;
  text-align: center;
  display: grid;
  gap: 28px;
  justify-items: center;
}

.hero-title-region {
  width: 100%;
  max-width: 100%;
  margin: 0;
  padding: 32px 22px 36px;
  box-sizing: border-box;
  display: grid;
  gap: 28px;
  justify-items: center;
  text-align: center;
  border-radius: var(--radius);
  background-image: url("../assets/background_title.png");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

h1,
h2,
h3,
h4 {
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: var(--fs-hero);
  line-height: 1.18;
  letter-spacing: -0.02em;
  word-spacing: 0.08em;
  font-weight: 600;
}

h2 {
  margin: 0 0 10px;
  font-size: var(--fs-section);
  text-align: center;
  letter-spacing: 0.03em;
}

h3 {
  font-size: var(--fs-meta);
  text-align: center;
  font-weight: 500;
}

.title-mark {
  display: inline-block;
  background: linear-gradient(to top, #5c8576 0%, #709d88 52%, #8ab39d 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  font-weight: 700;
  font-style: italic;
  letter-spacing: 0.04em;
  margin-right: 0.18em;
  text-shadow: 0 1px 3px rgba(112, 157, 136, 0.16);
}

.title-emphasis-one {
  color: #709d88;
}

.venue-row {
  margin: 0;
  color: #475467;
  font-size: var(--fs-meta);
  font-weight: 600;
}

.venue-row i {
  color: #d4a11d;
  margin: 0 6px 0 10px;
}

.venue-row .venue-icon-trophy {
  margin-right: 10px;
}

.venue-row .venue-icon {
  display: inline-block;
  margin: 0 6px 0 10px;
  line-height: 1;
  vertical-align: -0.12em;
}

.venue-row .venue-icon svg {
  display: block;
  width: 1.1em;
  height: 1.1em;
  fill: #e07a5f;
}

.venue-row .venue-label-oral {
  color: #e07a5f;
}

.venue-row .venue-label-candidate {
  color: #d4a11d;
}

.authors {
  max-width: 1100px;
  margin: 0 auto;
  color: #344054;
  font-size: var(--fs-meta);
  line-height: 1.9;
}

.author-link {
  color: #22324b;
  font-weight: 500;
  display: inline-block;
  margin: 0 8px 0 0;
}

.affiliations {
  color: var(--muted);
  font-size: var(--fs-body);
  line-height: 1.8;
}

.affiliation-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.affiliation-item + .affiliation-item {
  margin-left: 18px;
}

.affiliation-item i {
  color: #7c93bb;
  font-size: 0.95em;
 }

.hero-buttons {
  margin: 0;
  color: #475467;
  font-size: var(--fs-meta);
  line-height: 1.8;
}

.hero-button {
  display: inline-block;
  position: relative;
  color: #23334c;
  font-weight: 600;
}

.hero-button[data-link="code"],
.hero-button[data-link="code"]:hover,
.hero-button[data-link="code"]:active,
.hero-button[data-link="code"]:focus,
.hero-button[data-link="code"]:focus-visible,
.hero-button[data-link="code"]:visited {
  color: #667085;
  text-decoration: none;
  outline: none;
  box-shadow: none;
}

.hero-button.is-disabled {
  cursor: default;
}

.hero-button-tooltip {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  background: #1f2937;
  color: #fff;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 5px 10px;
  border-radius: 6px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease;
  z-index: 10;
  box-shadow: 0 6px 18px rgba(15, 23, 42, 0.18);
}

.hero-button:hover .hero-button-tooltip {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.hero-button i {
  margin-right: 6px;
}

.button-sep {
  color: #98a2b3;
  margin: 0 10px;
}

.section-card {
  padding: 0;
}

#abstract {
  background: #fff;
}

.section-header {
  margin-bottom: 18px;
  text-align: center;
}

.video-filter-bar {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.video-filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border);
  background: transparent;
  border-radius: 999px;
  padding: 7px 14px;
  color: #667085;
  font-size: 0.95rem;
  font-weight: 500;
  line-height: 1.1;
  cursor: pointer;
  outline: none;
  box-shadow: none;
}

.video-filter-btn:hover {
  background: #f7faff;
}

.video-filter-btn.is-active {
  background: #eef4ff;
  border-color: #c7d7f6;
  color: var(--blue-dark);
  font-weight: 600;
}

.video-filter-check {
  width: 14px;
  height: 14px;
  border: 1.5px solid currentColor;
  border-radius: 3px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.video-filter-btn.is-active .video-filter-check::before {
  content: "✓";
  font-size: 10px;
  line-height: 1;
}

.video-filter-btn:not(.is-active) .video-filter-check {
  opacity: 0.55;
}

.video-filter-btn:focus,
.video-filter-btn:focus-visible {
  outline: none;
  box-shadow: none;
}

.video-empty {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
  color: var(--muted);
  font-weight: 500;
  background: #ffffff;
  z-index: 1;
}

.video-empty.hidden {
  display: none;
}

.video-interaction-area.is-empty .video-shell-hover-btn,
.video-interaction-area.is-empty .video-controls-wrap {
  opacity: 0.45;
  pointer-events: none;
}

.section-description,
.section-card p {
  color: #475467;
  line-height: 1.8;
}

.section-card p:not(.tldr-inline) {
  text-indent: 2em;
}

.tldr-inline {
  margin: 0;
  padding: 20px 18px;
  border-left: 3px solid #c7d7f6;
  border-radius: 12px;
  background: #f8fbff;
  color: #344054;
  text-align: left;
}

.tldr-label {
  color: var(--blue-dark);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.video-shell {
  background: #ffffff;
  border-radius: 18px;
  overflow: hidden;
  position: relative;
  height: 560px;
}

.video-interaction-area {
  position: relative;
}

.video-shell .qualitative-video-layer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
  background: #ffffff;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.28s ease;
  will-change: opacity;
}

.video-shell .qualitative-video-layer.is-active {
  opacity: 1;
}

.video-loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: rgba(15, 23, 42, 0.62);
  color: #fff;
  font-weight: 600;
  transition: opacity 0.2s ease;
  z-index: 2;
}

.video-loading.hidden {
  opacity: 0;
  pointer-events: none;
}

.spinner {
  width: 42px;
  height: 42px;
  border: 4px solid rgba(255, 255, 255, 0.28);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.carousel-btn {
  border: none;
  background: transparent;
  border-radius: 999px;
  width: 44px;
  height: 44px;
  font-size: 1.45rem;
  font-weight: 600;
  color: #23334c;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.carousel-btn .carousel-arrow {
  display: block;
  line-height: 1;
}

.carousel-btn:hover {
  background: #f7faff;
}

.carousel-btn:focus,
.carousel-btn:focus-visible {
  outline: none;
  box-shadow: none;
}

.video-shell-hover-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 3;
  background: rgba(255, 255, 255, 0.86);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.video-shell-hover-btn.prev {
  left: 12px;
}

.video-shell-hover-btn.next {
  right: 12px;
}

.video-interaction-area:hover .video-shell-hover-btn,
.video-interaction-area:focus-within .video-shell-hover-btn {
  opacity: 1;
  pointer-events: auto;
}

.carousel-dots {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
}

.carousel-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: none;
  background: #d0d5dd;
  padding: 0;
  cursor: pointer;
}

.carousel-dot.active {
  background: #9a8c98;
}

.video-toolbar {
  width: fit-content;
  max-width: 100%;
  margin: 1px auto 0;
  display: grid;
  gap: 1px;
}

.video-controls-wrap {
  margin-top: 10px;
  width: fit-content;
  max-width: 100%;
  margin-left: auto;
  margin-right: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.video-controls-center {
  width: fit-content;
  max-width: 100%;
}

.video-progress-row {
  display: block;
  width: 100%;
}

.video-progress {
  width: 100%;
  margin: 0;
  accent-color: var(--blue);
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
}

.video-progress::-webkit-slider-runnable-track {
  height: 3px;
  background: #d0d5dd;
  border-radius: 999px;
}

.video-progress::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 10px;
  height: 10px;
  margin-top: -3.5px;
  border: none;
  border-radius: 2px;
  background: #98a2b3;
}

.video-progress::-moz-range-track {
  height: 3px;
  background: #d0d5dd;
  border-radius: 999px;
}

.video-progress::-moz-range-thumb {
  width: 10px;
  height: 10px;
  border: none;
  border-radius: 2px;
  background: #98a2b3;
}

.video-actions-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: nowrap;
}

.video-control-btn {
  border: 1px solid var(--border);
  background: transparent;
  border-radius: 999px;
  padding: 6px 10px;
  color: #23334c;
  font-size: var(--fs-body);
  font-weight: 500;
  line-height: 1.1;
  cursor: pointer;
  width: 118px;
  outline: none;
  box-shadow: none;
}

#video-speed-toggle {
  width: 132px;
}

.video-control-btn:hover {
  background: #f7faff;
}

.video-control-btn.is-active {
  background: #eef4ff;
  border-color: #c7d7f6;
  color: var(--blue-dark);
  font-weight: 600;
}

.video-control-btn:active {
  background: #f2f4f7;
}

.video-control-btn:focus,
.video-control-btn:focus-visible {
  outline: none;
  box-shadow: none;
  border-color: var(--border);
}

.speed-group {
  display: flex;
}

.method-figure {
  margin-top: 20px;
}

.abstract-figure {
  width: 80%;
  margin: 20px auto 12px;
  background: #fff;
}

.method-figure.abstract-figure.tldr-follow-video {
  width: 100%;
  margin: 44px auto 12px;
}

.abstract-figure img {
  border-radius: 0;
}

.pipeline-figure {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
}

.method-figure img {
  width: 100%;
  border-radius: 12px;
  background: #fff;
}

.method-figure video {
  width: 100%;
  border-radius: 12px;
  background: #fff;
  display: block;
}

.abstract-video-figure {
  width: 100%;
  margin-top: 14px;
  position: relative;
}

.abstract-video-toolbar {
  position: absolute;
  right: 12px;
  bottom: 12px;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 10px;
  flex-wrap: nowrap;
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 2;
}

.abstract-video-figure:hover .abstract-video-toolbar,
.abstract-video-figure:focus-within .abstract-video-toolbar {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.abstract-video-progress {
  width: 220px;
  max-width: 46vw;
}

.abstract-speed-toggle {
  width: 132px;
}

.metrics-explain {
  margin: 0 0 18px;
  padding: 0;
}

.metrics-explain p {
  margin: 0;
}

.metrics-explain p + p {
  margin-top: 10px;
}

.table-block + .table-block {
  margin-top: 22px;
}

.table-block h3 {
  margin-bottom: 12px;
  color: #344054;
}

.table-block h3 .camera-note {
  margin-left: 8px;
  color: #98a2b3;
  font-style: italic;
  font-size: 0.85em;
  font-weight: 400;
}

.table thead th {
  border: none;
  background: #f3f6fb;
  color: #2a3952;
  font-weight: 700;
  white-space: nowrap;
}

.table td,
.table th {
  vertical-align: middle;
  font-size: var(--table-font-size);
  border: none;
}

.table strong {
  color: #4a4e69;
}

.results-table {
  border-collapse: separate;
  border-spacing: 0 6px;
}

.results-table tbody tr td {
  background: #ffffff;
  transition: background 0.18s ease;
}

.results-table tbody tr:hover td {
  background: #fafcff;
}

.results-table tbody tr.refine-row td {
  background: #f8fbff;
}

.results-table tbody tr.refine-row td:first-child {
  border-top-left-radius: 10px;
  border-bottom-left-radius: 10px;
}

.results-table tbody tr.refine-row td:last-child {
  border-top-right-radius: 10px;
  border-bottom-right-radius: 10px;
}

.results-table tbody td:not(:first-child) {
  position: relative;
  padding-right: 72px;
}

.metric-delta {
  display: inline-block;
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.92em;
  font-weight: 600;
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.16s ease;
}

.refine-row:hover .metric-delta {
  opacity: 1;
}

.metric-delta.better {
  color: #166534;
}

.metric-delta.worse {
  color: #b42318;
}

.metric-delta.neutral {
  color: #667085;
}

pre {
  margin: 0;
  padding: 18px;
  border-radius: 16px;
  background: #f8fafc;
  border: 1px solid var(--border);
  color: #334155;
  white-space: pre-wrap;
  word-break: break-word;
}

.page-footer {
  width: 100%;
  margin-top: 56px;
  padding: 18px 24px;
  background: #f5f5f5;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

.page-footer p {
  margin: 0;
}

@media (max-width: 1400px) {
  .side-nav {
    display: none;
  }
}

@media (max-width: 768px) {
  .page {
    padding: 18px;
  }

  .hero {
    padding: 0;
  }

  .hero-title-region {
    padding: 24px 16px 28px;
    border-radius: 16px;
  }

  .section-card {
    padding: 0;
  }

  .video-shell {
    height: 320px;
  }

  .video-actions-row {
    gap: 8px;
  }

  .video-control-btn {
    min-width: 84px;
  }

  #video-speed-toggle {
    width: 110px;
  }

  .abstract-video-progress {
    width: 140px;
  }

  .abstract-speed-toggle {
    width: 110px;
  }

  .abstract-video-toolbar {
    position: static;
    margin-top: 10px;
    opacity: 1;
    transform: none;
    pointer-events: auto;
  }

  .video-toolbar {
    width: fit-content;
    max-width: 100%;
  }
}