/* Loki project page styles.
   Layered on top of ../../stylesheet.css (which sets the Lato base + link colors). */

:root {
  --max-w: 1080px;
  /* Wide banner layout: 8 cols x 2 rows of square tiles fills the page width
     (100vw) at a 4:1 aspect ratio -> grid height = 25vw. */
  --teaser-cols: 8;
  --teaser-rows: 2;
}

body { margin: 0; background: #fff; color: #111; }

/* ---------- FIXED SITE HEADER ----------
   Pinned to the top of the viewport. Sits above the teaser banner and the
   page content via a high z-index. */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 28px;
  padding: 10px 24px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid #e5e7eb;
}
.site-header .brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #111;
}
.site-header .brand-mark-btn {
  /* Round, button-shaped trigger for the "Why Loki?" modal. */
  width: 38px;
  height: 38px;
  padding: 0;
  margin: 0;
  border: 1px solid #e5e7eb;
  border-radius: 50%;
  background: #fff;
  overflow: hidden;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 120ms ease, box-shadow 120ms ease, border-color 120ms;
}
.site-header .brand-mark-btn:hover {
  transform: scale(1.06);
  border-color: #b91c1c;
  box-shadow: 0 2px 10px rgba(185, 28, 28, 0.18);
}
.site-header .brand-mark-btn:focus-visible {
  outline: 2px solid #b91c1c;
  outline-offset: 2px;
}
.site-header .brand-mark {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
}
.site-header .brand-name {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: inherit;
}
.site-header .brand-name:hover { color: #b91c1c; }

/* ---------- "WHY LOKI?" MODAL ----------
   Full-viewport overlay with a dark backdrop. The illustration sits centered
   at low opacity (the "transparent mode" the brief asked for); the rationale
   text overlays it in white. */
.loki-modal {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 180ms ease;
}
.loki-modal:not([hidden]) {
  visibility: visible;
  opacity: 1;
}
.loki-modal-backdrop {
  position: absolute;
  inset: 0;
  /* Heavily faded but not opaque — a translucent dark veil with a strong
     blur + slight desaturation behind it. The page underneath is barely
     visible (just enough to feel we're still on the site), but no text or
     detail competes with the modal content. */
  background: rgba(8, 8, 12, 0.82);
  backdrop-filter: blur(10px) saturate(0.5);
  -webkit-backdrop-filter: blur(10px) saturate(0.5);
  cursor: pointer;
}
/* Wrapper sized to the rendered image, so the close button can sit at the
   image's top-right corner regardless of how the image scales. */
.loki-modal-image-wrap {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  /* Wrap has no intrinsic size; the img inside (with max-h/w) dictates it. */
}
.loki-modal-image {
  display: block;
  max-height: 92vh;
  max-width: 92vw;
  width: auto;
  height: auto;
  opacity: 0.20;             /* "transparent mode" — image visible but quiet */
  pointer-events: none;
  border-radius: 6px;
}
.loki-modal-content {
  position: relative;
  z-index: 1;
  max-width: 760px;
  width: min(760px, 92vw);
  max-height: 92vh;
  overflow-y: auto;
  padding: 28px 36px 32px;
  color: #f9fafb;
  text-align: left;
  /* No card background — let the faded image read through. A soft inner
     glow keeps text legible without making the dialog feel boxed in. */
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.85);
}
.loki-modal-title {
  font-size: 38px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 16px 0;
  color: #fff;
  border: none;
  padding: 0;
}
.loki-modal-content p {
  font-size: 18px;
  line-height: 1.65;
  margin: 0 0 14px;
  color: #f3f4f6;
}
.loki-modal-content p strong { color: #fff; }
.loki-modal-close {
  /* Sits at the image's top-right corner (offset slightly outside so it
     reads as a corner control, not on top of the illustration). */
  position: absolute;
  top: -14px;
  right: -14px;
  z-index: 2;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.55);
  background: #1a1a22;
  color: #fff;
  font-size: 26px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: auto;
}
.loki-modal-close:hover {
  background: #2a2a35;
  border-color: rgba(255, 255, 255, 0.85);
}
/* Stop the page behind the modal from scrolling while it's open. */
body.modal-open { overflow: hidden; }
.site-nav {
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
}
.site-nav a {
  text-decoration: none;
  color: #374151;
  font-size: 15px;
  font-weight: 500;
  padding: 4px 2px;
  border-bottom: 2px solid transparent;
  transition: color 120ms, border-color 120ms;
}
.site-nav a:hover {
  color: #b91c1c;
  border-bottom-color: #b91c1c;
}

/* Sections need scroll-margin so click-to-anchor doesn't tuck the heading
   under the fixed header. */
.block { scroll-margin-top: 70px; }
html { scroll-behavior: smooth; }

/* ---------- GLOBAL FONT SIZE BUMP (project page only) ----------
   The shared site stylesheet (../../stylesheet.css) sets body/p/a to 16px,
   which is too tight for a long-form project page. We override on this page
   only, leaving the home page untouched. */
body, p, a, td, th, tr, li, figcaption { font-size: 19px; line-height: 1.55; }
strong { font-size: inherit; }
.content h2 { font-size: 32px; }
.lede { font-size: 19px; line-height: 1.6; }

/* ---------- TEASER (static banner; no scroll animation) ---------- */
.teaser {
  position: relative;
  background: #000;
}
.teaser-stage {
  position: relative;
  width: 100%;
}
.teaser-grid {
  width: 100vw;
  display: grid;
  grid-template-columns: repeat(var(--teaser-cols), 1fr);
  grid-template-rows:    repeat(var(--teaser-rows), 1fr);
  gap: 2px;
}
.teaser-grid .tile {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  background: #111;
  display: block;
  opacity: 0.75;
}

/* Title overlay covers the grid. Always visible. */
.teaser-title {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  background: radial-gradient(ellipse at center, rgba(0,0,0,0.55) 0%, rgba(0,0,0,0.25) 60%, rgba(0,0,0,0) 100%);
  pointer-events: none;
  padding: 0 24px;
}
.teaser-title h1 {
  font-size: clamp(40px, 7vw, 96px);
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
}
.teaser-title .subtitle {
  font-size: clamp(14px, 1.6vw, 22px);
  margin: 6px 0 12px;
  max-width: 900px;
  font-weight: 400;
}
.teaser-title .authors {
  font-size: clamp(13px, 1.4vw, 17px);
  margin: 4px 0;
}
.teaser-title .venue { font-size: 15px; opacity: 0.85; margin: 6px 0 0; }

/* ---------- CONTENT ---------- */
.content {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 48px 24px 96px;
}
.block { margin: 48px 0; }
.block h2 {
  border-bottom: 1px solid #eee;
  padding-bottom: 6px;
  margin-bottom: 16px;
}
.lede { color: #555; margin-top: 0; }
.highlights { padding-left: 20px; }
.highlights li { margin: 6px 0; }

/* Summary: three colored cards (What / Different / Why), each with a
   distinct pastel background, a thin border, and a prominent heading. */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.summary-item {
  padding: 22px 22px 24px;
  border-radius: 12px;
  border: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}
/* Three matching tints so the eye groups them as a row but can still
   distinguish each card. Heading color picks up the card's accent. */
.summary-item:nth-child(1) { background: #eef4ff; }                       /* cool blue   */
.summary-item:nth-child(1) .summary-label { color: #0d47a1; }
.summary-item:nth-child(2) { background: #fff5db; }                       /* warm cream  */
.summary-item:nth-child(2) .summary-label { color: #8a5a00; }
.summary-item:nth-child(3) { background: #e8f5ec; }                       /* mint        */
.summary-item:nth-child(3) .summary-label { color: #1b6b3b; }

.summary-item .summary-label {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.2;
  margin-bottom: 10px;
}
.summary-item p {
  margin: 0;
  font-size: 19px;
  line-height: 1.55;
  color: #1c1c1c;
}
@media (max-width: 720px) {
  .summary-grid { grid-template-columns: 1fr; gap: 12px; }
  .summary-item .summary-label { font-size: 20px; }
}

.figure { margin: 0; text-align: center; }
.figure img { max-width: 100%; height: auto; border: 1px solid #eee; border-radius: 6px; }
.figure figcaption { color: #666; font-size: 15px; margin-top: 8px; }

/* ---------- DATA EFFICIENCY GAUGES ---------- */
.gauges-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.gauge-card {
  position: relative;
  padding: 14px 12px 16px;
  border-radius: 12px;
  border: 1px solid #e5e7eb;
  background: #fafbfd;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.gauge-card.loki-card {
  border: 2px solid #e63946;
  background: #fff5f5;
  box-shadow: 0 2px 12px rgba(230, 57, 70, 0.12);
}
.gauge-tag {
  position: absolute;
  top: 10px;
  right: 10px;
  background: #e63946;
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 3px 8px;
  border-radius: 4px;
  text-transform: uppercase;
}
.gauge-img {
  width: 100%;
  max-width: 220px;
  height: auto;
  display: block;
}
.gauge-name {
  font-size: 17px;
  font-weight: 700;
  color: #1f2937;
  margin-top: 4px;
}
.loki-card .gauge-name { color: #e63946; }
.gauge-value {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: #111;
  margin-top: 2px;
  line-height: 1.1;
}
.loki-card .gauge-value { color: #e63946; }
.gauge-value .unit {
  font-size: 15px;
  font-weight: 500;
  color: #6b7280;
}
.gauge-ratio {
  font-size: 15px;
  color: #6b7280;
  margin-top: 4px;
  letter-spacing: 0.02em;
}
.figure-note {
  font-size: 15px;
  color: #4b5563;
  text-align: center;
  margin-top: 22px;
}
@media (max-width: 720px) {
  .gauges-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .gauge-value { font-size: 22px; }
}

/* ---------- CAROUSEL PREV/NEXT BUTTONS ----------
   Used by both the catalogue and the SOTA comparison. The wrap is the
   positioning context; buttons float on the left/right edges. */
.carousel-wrap {
  position: relative;
}
.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 5;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid #d4d4d8;
  background: #fff;
  color: #1f2937;
  font-size: 26px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.10);
  transition: background 120ms, transform 120ms, border-color 120ms;
}
.carousel-btn:hover {
  background: #f9fafb;
  border-color: #9ca3af;
}
.carousel-btn:active { transform: translateY(-50%) scale(0.96); }
.carousel-btn.prev  { left:   8px; }
.carousel-btn.next  { right:  8px; }
.carousel-btn:focus-visible {
  outline: 2px solid #1d4ed8;
  outline-offset: 2px;
}

/* ---------- LOKI'S CATALOGUE ----------
   Same shape as the SOTA comparison carousel: a sticky vertical "Inputs /
   Output" axis on the left, then horizontally scrolling sample cards. Each
   card has Reference + Driver on top (inputs row) and Loki's animation
   below (output row, larger). */
.catalog-grid {
  display: flex;
  align-items: stretch;
  gap: 18px;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  padding-bottom: 8px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.catalog-grid::-webkit-scrollbar { display: none; }
.catalog-axis {
  box-sizing: border-box;
  flex: 0 0 70px;
  display: flex;
  flex-direction: column;
  padding-right: 18px;
  padding-bottom: 26px;            /* room for figcaption row */
}
.catalog-axis .axis-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.10em;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
}
.catalog-axis .axis-inputs { flex: 152 0 0; color: #6b7280; }
.catalog-axis .axis-output { flex: 294 0 0; color: #b91c1c; }

.catalog-item {
  margin: 0;
  flex: 0 0 280px;                 /* fixed card width */
  scroll-snap-align: start;
  display: grid;
  grid-template-rows: auto auto auto;
  gap: 4px;
}
.catalog-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
}
.catalog-cell { display: flex; flex-direction: column; }
.catalog-cell .cell-label {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
  margin-bottom: 3px;
}
.catalog-cell .label-input { color: #6b7280; }
.catalog-item video,
.catalog-item img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 6px;
  background: #f3f3f3;
  display: block;
}
/* The single Loki output sits in a red-tinted box mirroring the SOTA
   comparison "outputs" treatment, so the eye knows where the result is. */
.catalog-output {
  background: #fff5f5;
  border: 1px solid rgba(185, 28, 28, 0.20);
  border-radius: 8px;
  padding: 6px;
}
.catalog-item figcaption {
  font-size: 15px;
  color: #555;
  margin-top: 4px;
  text-align: center;
}

/* ---------- SHARED: carousel-row layout (used by the catalogue) ---------- */
.carousel-row { display: flex; align-items: stretch; gap: 0; }
.carousel-row > .carousel-wrap { flex: 1 1 auto; min-width: 0; }

/* ---------- COMPARISON TABLE (all baselines at once) ----------
   7-column grid: [Inputs (stacked Ref + Driver) | Ours | X-Portrait |
   HunyuanPortrait | EchoMimic | AniTalker | SadTalker].
   Column ratio 1:2:2:2:2:2:2 — outputs are twice the width of the input
   column, so the two stacked square inputs match an output square's height.
   A vertical delineator sits between the inputs and outputs.  The Ours
   cell carries a red border + halo so Loki visually leads every row. */
.compare-grid {
  display: grid;
  grid-template-columns: 1.5fr 2fr 2fr 2fr 2fr 2fr 2fr;
  column-gap: 8px;
  row-gap: 4px;
  /* Center each sample row vertically so the output cells line up with the
     middle of the stacked inputs (which are taller). */
  align-items: center;
}

/* Header row */
.compare-grid .col-head {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-align: center;
  padding: 6px 2px;
  border-bottom: 1px solid #e5e7eb;
  margin-bottom: 6px;
  /* Sticky header so the column labels stay visible while the reader
     scrolls down through samples. Offset clears the fixed .site-header. */
  position: sticky;
  top: 60px;
  background: #fff;
  z-index: 3;
}
.compare-grid .col-input     { color: #6b7280; margin-right: 16px; }
.compare-grid .col-base-head { color: #1d4ed8; }
.compare-grid .col-ours-head {
  color: #b91c1c;
  border-bottom-color: rgba(185, 28, 28, 0.35);
}
.compare-grid .col-ours-head .loki-sub {
  display: inline-block;
  margin-left: 2px;
  font-size: 11px;
  font-weight: 500;
  text-transform: none;
  letter-spacing: 0;
  opacity: 0.85;
}

/* Inputs column: two square tiles stacked. The 1.5fr column makes each tile
   roughly 120 px wide; stacked, they form a column noticeably taller than a
   single output square, which is fine — outputs vertically center against
   the stack's middle line (align-items: center on the grid). */
.compare-grid .input-stack {
  position: relative;
  display: flex;
  flex-direction: column;
  margin-right: 16px;
  gap: 4px;
}
/* Vertical delineator between the Inputs column and the outputs strip.
   Lives on the input-stack so it never affects the Ours cell width. */
.compare-grid .input-stack::after {
  content: '';
  position: absolute;
  top: 8px;
  bottom: 8px;
  right: -8px;            /* halfway into the column-gap (8 px) */
  width: 1px;
  background: #d4d4d8;
}
.compare-grid .input-item { display: flex; flex-direction: column; }
.compare-grid .input-label {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
  color: #6b7280;
  margin-bottom: 3px;
  text-align: center;
}
.compare-grid .input-item img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 6px;
  background: #f3f3f3;
  display: block;
}
/* Driver tile gets a green outline + soft halo so the viewer can tell at a
   glance which clip is the motion source for every method in the row. */
.compare-grid .input-item--driver img {
  outline: 2px solid #16a34a;
  outline-offset: 0;
  box-shadow: 0 0 0 4px #f0fdf4;
}

/* Output cells */
.compare-grid .cell { display: flex; flex-direction: column; }
.compare-grid .cell img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 6px;
  background: #f3f3f3;
  display: block;
}

/* Ours cell: red border + halo on the image. The border is drawn as an
   `outline` so it sits OUTSIDE the box and doesn't shrink the rendered
   image content vs. the unbordered baseline cells. The cell itself has no
   padding/margin so its width matches every baseline cell exactly. */
.compare-grid .cell-ours img {
  outline: 2px solid #e63946;
  outline-offset: 0;
  box-shadow: 0 0 0 6px #fff5f5;
  border-radius: 6px;
}

.compare-grid .row-caption {
  grid-column: 1 / -1;
  text-align: center;
  font-size: 15px;
  color: #555;
  margin: 6px 0 22px;
}

/* On narrower viewports the table starts to crush; allow horizontal scroll
   while keeping the 1:2:... column rhythm. */
@media (max-width: 1100px) {
  .compare-grid {
    grid-template-columns: minmax(90px, 1fr) repeat(6, minmax(180px, 2fr));
    overflow-x: auto;
  }
}

/* ---------- FOOTER ---------- */
.back { text-align: center; margin-top: 48px; font-size: 15px; }

/* ---------- RESPONSIVE ----------
   Tablet and phone tweaks. Goal: nothing horizontally overflows the viewport
   except the intentionally-scrollable catalogue and comparison strips. */
@media (max-width: 900px) {
  .site-header  { padding: 8px 14px; }
  .site-nav     { gap: 14px; }
  .site-nav a   { font-size: 14px; }
  .content      { padding: 32px 16px 64px; }
  .block        { margin: 36px 0; }
  .content h2   { font-size: 26px; }
}

@media (max-width: 640px) {
  /* Teaser: switch from 8x2 to 4x4 so tiles stay legible on a phone. */
  :root { --teaser-cols: 4; --teaser-rows: 4; }

  /* Tighter base type. */
  body, p, a, td, th, tr, li, figcaption { font-size: 17px; line-height: 1.55; }
  .lede        { font-size: 17px; }
  .content h2  { font-size: 22px; }
  .content     { padding: 24px 14px 56px; }
  .block       { margin: 28px 0; scroll-margin-top: 60px; }

  /* Header: drop the section nav (page is short enough to scroll), shrink
     the brand. Keep the brand-mark button as the modal trigger. */
  .site-header              { padding: 6px 12px; }
  .site-header .brand-mark-btn { width: 32px; height: 32px; }
  .site-header .brand-name     { font-size: 16px; }
  .site-nav                 { display: none; }

  /* Summary cards. */
  .summary-item              { padding: 16px 16px 18px; }
  .summary-item .summary-label { font-size: 18px; }
  .summary-item p            { font-size: 17px; }

  /* Gauges: two-up already, just shrink type/values. */
  .gauges-grid     { grid-template-columns: 1fr 1fr; gap: 10px; }
  .gauge-card      { padding: 10px 8px 12px; }
  .gauge-name      { font-size: 15px; }
  .gauge-value     { font-size: 20px; }
  .gauge-value .unit { font-size: 13px; }
  .gauge-ratio     { font-size: 13px; }
  .figure-note     { font-size: 13px; }

  /* Modal. */
  .loki-modal-title  { font-size: 26px; }
  .loki-modal-content { padding: 20px 18px 24px; }
  .loki-modal-content p { font-size: 16px; line-height: 1.55; }
  .loki-modal-close  { width: 34px; height: 34px; font-size: 22px;
                       top: -10px; right: -10px; }

  /* Catalogue: smaller cards so one fits onscreen with the axis label. */
  .catalog-item        { flex: 0 0 230px; }
  .catalog-axis        { flex: 0 0 44px; padding-right: 10px; padding-bottom: 18px; }
  .catalog-axis .axis-cell { font-size: 11px; letter-spacing: 0.08em; }
  .carousel-btn        { width: 38px; height: 38px; font-size: 22px; }
  .carousel-btn.prev   { left: 4px; }
  .carousel-btn.next   { right: 4px; }

  /* Comparison: narrower column floors so the horizontal-scroll strip feels
     proportionate on a phone screen rather than enormously wide. */
  .compare-grid {
    grid-template-columns: minmax(70px, 1fr) repeat(6, minmax(130px, 2fr));
    column-gap: 6px;
  }
  .compare-grid .col-head    { font-size: 12px; top: 52px; }
  .compare-grid .col-input   { margin-right: 10px; }
  .compare-grid .input-stack { margin-right: 10px; }
  .compare-grid .input-label { font-size: 11px; }
  .compare-grid .cell-ours img { box-shadow: 0 0 0 4px #fff5f5; }
}