/* ===== SwiftI2V Project Page Custom Styles ===== */

:root {
  --primary: #1f6feb;
  --primary-dark: #0b4cb3;
  --accent: #ff8c00;
  --bg-soft: #f7f9fc;
  --border-soft: #e4e8ef;
  --text-muted: #606770;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans', 'Google Sans', 'Roboto', 'Inter', -apple-system,
    BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
  background-color: #ffffff;
  color: #1f2328;
}

/* ---------- Hero ---------- */

.publication-title {
  font-family: 'Google Sans', 'Noto Sans', sans-serif !important;
  font-weight: 800 !important;
  letter-spacing: -0.5px;
  line-height: 1.2;
}

.swifti2v-gradient {
  background: linear-gradient(90deg, #1f6feb 0%, #6a5acd 50%, #ff8c00 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.title-logo {
  height: 1.15em;
  width: auto;
  vertical-align: -0.18em;
  margin-right: 0.05em;
  /* Blend the white background of the logo into the page */
  mix-blend-mode: multiply;
  display: inline-block;
  max-width: 100%;
}

.title-sep {
  font-weight: 800;
  margin-left: -0.1em;
}

@media (max-width: 768px) {
  .title-logo {
    height: 0.95em;
    display: block;
    margin: 0 auto 0.4rem auto;
  }
  .title-sep {
    display: none;
  }
}

.publication-authors {
  font-size: 1.05rem;
  margin-top: 0.5rem;
}

.publication-authors a {
  color: #1f6feb;
  text-decoration: none;
}

.publication-authors a:hover {
  text-decoration: underline;
}

.author-block {
  display: inline-block;
  margin-right: 0.6rem;
}

.affiliations {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
}

/* ---------- Link Buttons ---------- */

.publication-links {
  margin-top: 1.5rem;
}

.publication-links .link-block {
  display: inline-block;
  margin: 0.3rem;
}

.publication-links .button {
  background-color: #1b1f24;
  color: #fff;
  border: none;
  border-radius: 999px;
  padding: 0.55rem 1.25rem;
  font-weight: 500;
  transition: transform 0.15s ease, background-color 0.15s ease;
}

.publication-links .button:hover {
  background-color: #2f3640;
  color: #fff;
  transform: translateY(-1px);
}

.publication-links .button.is-disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.publication-links .button .icon {
  margin-right: 0.35rem;
}

/* ---------- Highlights / TL;DR Cards ---------- */

.highlights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.highlights-grid.highlights-3 {
  max-width: 780px;
  margin: 2rem auto;
  grid-template-columns: repeat(3, 1fr);
}

.highlight-card {
  background: var(--bg-soft);
  border: 1px solid var(--border-soft);
  border-radius: 12px;
  padding: 1.3rem 1rem;
  text-align: center;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.highlight-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 18px rgba(31, 111, 235, 0.12);
}

.highlight-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary);
  font-family: 'Google Sans', sans-serif;
  line-height: 1.1;
}

.highlight-label {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

/* ---------- Section Headings ---------- */

.section {
  padding: 3rem 1.5rem;
}

.section:nth-child(even) {
  background-color: #fafbfd;
}

.section-title {
  font-size: 2rem !important;
  font-weight: 800 !important;
  text-align: center;
  margin-bottom: 0.4rem !important;
  color: #1b1f24;
}

.section-subtitle {
  text-align: center;
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 2rem;
}

.content p {
  font-size: 1.05rem;
  line-height: 1.75;
  color: #25292e;
  text-align: justify;
}

/* ---------- Videos ---------- */

.video-card {
  border-radius: 10px;
  overflow: hidden;
  background: #000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.video-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.14);
}

.video-card video {
  display: block;
  width: 100%;
  height: auto;
  background: #000;
}

/* Reserve space only for gallery cards (square-ish grid items) so they don't
   collapse before metadata loads. Full-width / comparison / ablation videos
   keep their native aspect-ratio to avoid letterbox black bars. */
.gallery-grid .video-card video {
  aspect-ratio: 16 / 9;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1rem;
}

.ablation-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  max-width: 1180px;
  margin: 0 auto;
}

@media (max-width: 768px) {
  .ablation-grid {
    grid-template-columns: 1fr;
  }
}

.full-width-video {
  max-width: 960px;
  margin: 0 auto 1.2rem auto;
}

/* ---------- Teaser Carousel ---------- */

.carousel {
  position: relative;
  max-width: 1080px;
  margin: 0 auto;
  border-radius: 12px;
  overflow: hidden;
  background: #000;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.12);
}

.carousel-track {
  position: relative;
  width: 100%;
  /* Keep a stable aspect ratio matching the 2K videos (2560:1408) */
  aspect-ratio: 2560 / 1408;
  overflow: hidden;
}

.carousel-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.55s ease, transform 0.55s ease;
  pointer-events: none;
}

.carousel-slide.is-active {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
  z-index: 2;
}

.carousel-slide.is-leaving {
  opacity: 0;
  transform: translateX(-30px);
  z-index: 1;
}

.carousel-slide video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Arrow buttons */
.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  z-index: 5;
  transition: background-color 0.2s ease, transform 0.2s ease;
  backdrop-filter: blur(4px);
}

.carousel-btn:hover {
  background: rgba(31, 111, 235, 0.85);
  transform: translateY(-50%) scale(1.08);
}

.carousel-prev { left: 14px; }
.carousel-next { right: 14px; }

/* Dots */
.carousel-dots {
  position: absolute;
  bottom: 12px;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  gap: 8px;
  z-index: 5;
}

.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.45);
  border: none;
  cursor: pointer;
  padding: 0;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.carousel-dot.is-active {
  background: #fff;
  transform: scale(1.25);
}

/* Fade hints on the edges */
.carousel::before,
.carousel::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 60px;
  z-index: 3;
  pointer-events: none;
}

.carousel::before {
  left: 0;
  background: linear-gradient(90deg, rgba(0, 0, 0, 0.35), transparent);
}

.carousel::after {
  right: 0;
  background: linear-gradient(-90deg, rgba(0, 0, 0, 0.35), transparent);
}

/* ---------- Method ---------- */

.method-figure-img {
  max-width: 100%;
  margin: 0 auto 2rem auto;
  background: white;
  border: 1px solid var(--border-soft);
  border-radius: 10px;
  padding: 1rem;
  text-align: center;
}

.method-figure-img img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 4px;
}

.method-figure-img figcaption {
  margin-top: 0.9rem;
  font-size: 0.95rem;
  color: var(--text-muted);
  text-align: left;
  line-height: 1.6;
}

.method-split {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 2rem;
  align-items: center;
  max-width: 100%;
  margin: 0 auto;
}

.method-split-figure {
  background: white;
  border: 1px solid var(--border-soft);
  border-radius: 10px;
  padding: 1rem;
}

.method-split-figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 4px;
}

.method-split-caption {
  margin-top: 0.7rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.5;
}

.method-split-text .title {
  margin-bottom: 0.6rem;
  color: #1b1f24;
}

@media (max-width: 880px) {
  .method-split {
    grid-template-columns: 1fr;
  }
}

/* ---------- BibTeX ---------- */

#bibtex pre {
  background-color: #0d1117;
  color: #e6edf3;
  padding: 1.25rem;
  border-radius: 10px;
  font-size: 0.88rem;
  line-height: 1.55;
  overflow-x: auto;
}

/* ---------- Footer ---------- */

.footer {
  padding: 2rem 1.5rem;
  background: #1b1f24;
  color: #c9d1d9;
  text-align: center;
  font-size: 0.9rem;
}

.footer a {
  color: #58a6ff;
}

/* ---------- Responsive tweaks ---------- */

@media (max-width: 768px) {
  .publication-title {
    font-size: 1.9rem !important;
  }
  .section {
    padding: 2rem 1rem;
  }
  .highlights-grid.highlights-3 {
    grid-template-columns: 1fr;
  }
  .carousel-btn {
    width: 36px;
    height: 36px;
  }
}