/* ============================================================
   landing.css — Index / paper landing page styles.
   Section band system, hover float effects, gallery feature,
   human-ref video, author block, font overrides.
   ============================================================ */

/* ── Font overrides ─────────────────────────────────────────── */
body {
  font-family: 'Noto Sans', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
}
.hero-title, .paper-section-title, .arena-title, .page-title,
h1, h2, h3 {
  font-family: 'Google Sans', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
}

/* ── Show nav on landing page ────────────────────────────────── */
/* style.css hides it for anonymous visitors; we override here   */
body.landing-page .pst-header-nav { display: flex !important; }

/* ── FA icon sizing ─────────────────────────────────────────── */
.pst-btn i, .pst-btn .ai     { font-size: .95em; vertical-align: -.05em; }
.pst-header-nav a i          { font-size: .85em; margin-right: .25rem; opacity: .8; }
.paper-section-eyebrow i     { margin-right: .3rem; opacity: .7; font-size: .85em; }

/* ── Author / venue block ────────────────────────────────────── */
.hero-authors {
  margin: 1.1rem 0 1.5rem;
  display: flex; flex-direction: column; align-items: center; gap: .45rem;
}
.hero-author-names {
  font-family: 'Google Sans', sans-serif;
  font-size: 1.1rem; color: var(--text-muted); font-weight: 400; letter-spacing: .01em;
}
.hero-author-names a {
  color: var(--primary); text-decoration: none;
  border-bottom: 1px solid transparent; transition: border-color .2s;
}
.hero-author-names a:hover { border-bottom-color: var(--primary); }
.hero-affil    { font-size: .9rem; color: var(--text-muted); font-family: 'Noto Sans', sans-serif; }
.hero-venue-row {
  display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; justify-content: center;
}
.venue-badge {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .3rem .8rem; border-radius: 999px;
  background: var(--primary-bg); color: var(--primary);
  font-size: .82rem; font-weight: 600;
  font-family: 'Google Sans', sans-serif; letter-spacing: .02em;
}
.venue-badge i { font-size: .8rem; }
.anon-note     { font-size: .8rem; color: var(--text-muted); font-style: italic; }

/* ── Section band system ─────────────────────────────────────── */
/* Strips the default pst-main vertical padding; each band owns its spacing */
.landing-main { padding: 0 !important; }

.lp-band { width: 100%; }

.lp-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 5rem 2rem;
}
.lp-inner-wide   { max-width: 1400px; }
.lp-inner-narrow { max-width: 900px; }

/* Remove the paper-section's own margin/max-width when inside a band */
.lp-band .paper-section,
.lp-band .paper-section-abstract {
  margin: 0;
  max-width: none;
  padding: 0;
}
.lp-band .paper-section-wide {
  width: 100%; max-width: none; padding-inline: 0;
}

/* Band backgrounds */
.lp-band-white { background: var(--on-bg); }
.lp-band-gray  { background: var(--surface); }
.lp-band-hero  { background: var(--bg); }
.lp-band-accent {
  background: linear-gradient(135deg, var(--primary) 0%, #5e5ce6 100%);
}

/* Accent band text overrides */
.lp-band-accent .paper-section-eyebrow { color: rgba(255,255,255,.78); }
.lp-band-accent .paper-section-title   { color: #fff; }
.lp-band-accent .paper-section-body    { color: rgba(255,255,255,.9); }
.lp-band-accent .pst-btn {
  background: rgba(255,255,255,.18); color: #fff;
}
.lp-band-accent .pst-btn:hover {
  background: rgba(255,255,255,.28); color: #fff; text-decoration: none;
}
.lp-band-accent .pst-btn-primary {
  background: #fff; color: var(--primary);
}
.lp-band-accent .pst-btn-primary:hover {
  background: rgba(255,255,255,.9); color: var(--primary);
}

/* ── Hover float effects ─────────────────────────────────────── */
.key-finding-card {
  transition: transform .22s cubic-bezier(.4,0,.2,1),
              box-shadow .22s cubic-bezier(.4,0,.2,1);
  cursor: default;
}
.key-finding-card:hover {
  transform: translateY(-7px);
  box-shadow: 0 12px 32px rgba(0,113,227,.1), 0 2px 8px rgba(0,0,0,.05);
}

.dataset-fact {
  transition: transform .22s ease, box-shadow .22s ease;
  cursor: default;
}
.dataset-fact:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 28px rgba(0,113,227,.1);
}

.results-cell {
  transition: box-shadow .22s ease;
}
.results-cell:hover {
  box-shadow: 0 8px 28px rgba(0,0,0,.1);
}

.paper-figure {
  transition: transform .22s ease;
}
.paper-figure:hover {
  transform: translateY(-4px);
}
.paper-figure:hover img {
  box-shadow: 0 12px 40px rgba(0,0,0,.13);
}

/* ── Gallery Feature section ─────────────────────────────────── */
.lp-gallery-intro {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 3.5rem;
  align-items: center;
}
.lp-gallery-text .paper-section-eyebrow { margin-bottom: .6rem; }
.lp-gallery-text h2 {
  font-size: 2rem; font-weight: 700; letter-spacing: -.025em;
  margin: 0 0 .85rem;
}
.lp-gallery-text p {
  font-size: 1.0625rem; line-height: 1.6;
  color: var(--text-muted); margin-bottom: 1.5rem;
}
.lp-gallery-cta { display: flex; gap: .85rem; flex-wrap: wrap; }

.lp-gallery-preview {
  display: grid; grid-template-columns: 1fr 1fr; gap: .75rem;
}
.lp-gallery-card {
  background: var(--on-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.1rem .9rem;
  display: flex; flex-direction: column; gap: .45rem;
  text-decoration: none; color: var(--text);
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.lp-gallery-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
  text-decoration: none; color: var(--text);
}
.lp-gallery-card-dots { display: flex; gap: .3rem; }
.lp-gallery-card-dot {
  font-size: .68rem; font-weight: 600;
  padding: .1rem .38rem;
  border: 1px solid currentColor;
  border-radius: var(--radius);
}
.lp-gallery-card-dot.l0 { color: var(--l0); }
.lp-gallery-card-dot.l1 { color: var(--l1); }
.lp-gallery-card-dot.l2 { color: var(--l2); }
.lp-gallery-card-dot.l3 { color: var(--l3); }
.lp-gallery-card-title { font-size: .9rem; font-weight: 600; line-height: 1.3; }
.lp-gallery-card-meta  { font-size: .78rem; color: var(--text-muted); }

@media (max-width: 900px) {
  .lp-gallery-intro { grid-template-columns: 1fr; gap: 2.5rem; }
}
@media (max-width: 500px) {
  .lp-gallery-preview { grid-template-columns: 1fr; }
}

/* ── Human Reference Video section ──────────────────────────── */
.lp-human-ref {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 2.5rem;
  align-items: center;
}

.lp-human-video-wrap {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #0d1117;
  aspect-ratio: 16 / 9;
  box-shadow: var(--shadow-lg);
  transition: transform .25s ease, box-shadow .25s ease;
}
.lp-human-video-wrap:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 52px rgba(0,0,0,.18);
}
.lp-human-video-wrap video {
  width: 100%; height: 100%; display: block; object-fit: cover;
}
/* Placeholder shown when no video file exists yet */
.lp-human-video-placeholder {
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: .6rem;
  background: linear-gradient(135deg, rgba(20,30,50,.95), rgba(10,15,25,.98));
  color: rgba(255,255,255,.65); text-align: center; padding: 1rem;
  font-size: .9rem;
}
.lp-human-video-placeholder code {
  font-size: .78rem; color: rgba(255,255,255,.38);
  background: rgba(255,255,255,.06);
  padding: .15rem .45rem; border-radius: 4px;
}
.lp-human-video-wrap.lp-video-missing video { display: none; }
.lp-human-video-wrap.lp-video-missing .lp-human-video-placeholder { display: flex !important; }

.lp-human-video-label {
  position: absolute; top: .8rem; left: .85rem;
  background: rgba(0,0,0,.62); color: #fff;
  font-size: .69rem; font-weight: 700;
  letter-spacing: .06em; text-transform: uppercase;
  padding: .22rem .62rem; border-radius: var(--radius-pill);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.lp-human-ref-text .paper-section-eyebrow { margin-bottom: .55rem; }
.lp-human-ref-text h3 {
  font-family: 'Google Sans', sans-serif;
  font-size: 1.65rem; font-weight: 700; letter-spacing: -.02em;
  margin: 0 0 .85rem; line-height: 1.2;
}
.lp-human-ref-text p {
  font-size: 1rem; line-height: 1.65;
  color: var(--text-muted); margin-bottom: 1.2rem;
}
.lp-human-ref-text .lp-arena-cta { display: flex; gap: .75rem; flex-wrap: wrap; }

@media (max-width: 860px) {
  .lp-human-ref { grid-template-columns: 1fr; }
  .lp-human-video-wrap { order: -1; }
}

/* ── Footer (clean, no icon links) ──────────────────────────── */
.lp-footer {
  background: var(--on-bg);
  border-top: 1px solid var(--border);
}
.lp-footer-inner {
  max-width: 1100px; margin: 0 auto; padding: 1.1rem 2rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  font-size: .85rem; color: var(--text-muted);
}

@media (max-width: 640px) {
  .lp-inner { padding: 3.5rem 1.25rem; }
  .lp-footer-inner { flex-direction: column; gap: .35rem; text-align: center; }
}