/* ============================================================
   Academic theme for the AD-GS video gallery page, matching the
   redesigned main project page (ADGS.html). Same palette/typography/
   card language, layered on top of the existing w3.css template.
   ============================================================ */

:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f7f8fb;
  --color-text: #3a3f4b;
  --color-text-soft: #6b7280;
  --color-heading: #1f2430;
  --color-accent: #3454d1;
  --color-card-bg: #ffffff;
  --color-card-border: #e6e8ef;
  --shadow-color: rgba(31, 41, 55, 0.08);
  --radius: 14px;
}

body {
  font-family: 'Inter', 'Noto Sans', sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
}

/* ---------- Title panel (hero equivalent) ---------- */
#title-panel {
  background: linear-gradient(180deg, #f5f7fd 0%, #ffffff 100%) !important;
  padding-top: 4rem !important;
  padding-bottom: 3rem !important;
  position: relative;
}

.back-to-main {
  position: absolute;
  top: 1.25rem;
  left: 1.5rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-accent) !important;
  text-decoration: none !important;
}

.back-to-main:hover {
  text-decoration: underline !important;
}

@media (max-width: 600px) {
  .back-to-main {
    position: static;
    display: flex;
    margin-bottom: 1rem;
  }
}

.page-title {
  font-family: 'Google Sans', 'Inter', sans-serif;
  color: var(--color-heading);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-subtitle {
  display: inline-block;
  margin: 0 auto;
  font-family: 'Inter', sans-serif !important;
  font-size: 0.9rem !important;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: #eef1fc;
  color: var(--color-accent);
  padding: 0.5rem 1.25rem;
  border-radius: 999px;
}

#title-panel {
  text-align: center;
}

/* ---------- Page content container ---------- */
.page-content {
  max-width: 1000px;
  width: 92%;
  margin: 3rem auto 0;
}

/* ---------- Section headers ---------- */
h2, h3 {
  color: var(--color-heading) !important;
}

#abstract h2,
#video-comparisons h2 {
  color: var(--color-accent) !important;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  font-weight: 700;
  font-family: 'Google Sans', 'Inter', sans-serif;
}

#video-comparisons > h4 {
  color: var(--color-text-soft) !important;
  font-weight: 400;
  font-size: 1rem;
  margin-top: -0.5rem;
  margin-bottom: 2rem;
}

#abstract p {
  color: var(--color-text);
  line-height: 1.7;
}

/* ---------- Video cards ---------- */
#video-comparisons-floaters figure.video-comparisons-llff-wrap,
#video-comparisons-floaters > figure {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1.75rem;
  box-shadow: 0 4px 18px var(--shadow-color);
}

.video-comparisons-llff {
  border-radius: calc(var(--radius) - 6px);
}

figcaption.caption {
  color: var(--color-text-soft);
  font-size: 0.9rem;
  margin-top: 0.85rem;
  letter-spacing: 0.01em;
}

@media (max-width: 600px) {
  .page-content {
    width: 94%;
    margin-top: 2rem;
  }

  #video-comparisons-floaters > figure {
    padding: 0.85rem;
  }
}