/* ============================================================
   style.css — Infer3D Research Website
   ============================================================ */

/* --- CSS Variables --- */
:root {
  --color-primary: #2563EB;
  --color-primary-dark: #1D4ED8;
  --color-hero-start: #0F172A;
  --color-hero-end: #1E3A5F;
  --color-text: #1E293B;
  --color-text-secondary: #475569;
  --color-bg-light: #F8FAFC;
  --color-border: #E2E8F0;
  --color-surface: #FFFFFF;
  --font-heading: 'Source Serif 4', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --carousel-radius: 8px;
}

/* --- Global --- */
body {
  font-family: var(--font-body);
  color: var(--color-text);
}

.title, h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-text);
}

a {
  color: var(--color-primary);
  transition: color 0.2s;
}
a:hover {
  color: var(--color-primary-dark);
}

/* --- Hero Section --- */
.hero-section {
  background: linear-gradient(135deg, var(--color-hero-start) 0%, var(--color-hero-end) 100%);
  padding: 4rem 1.5rem 3rem;
}

.hero-section .publication-title {
  font-family: var(--font-heading);
  font-size: 2.6rem;
  font-weight: 700;
  color: #FFFFFF;
  line-height: 1.2;
  max-width: 850px;
  margin: 0 auto 1.5rem;
}

.hero-section .publication-authors {
  color: #CBD5E1;
  font-size: 1.15rem;
  margin-bottom: 0.3rem;
}
.hero-section .publication-authors a {
  color: #93C5FD;
}
.hero-section .publication-authors a:hover {
  color: #BFDBFE;
}
.publication-links {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}
.publication-links .button {
  border: 1px solid rgba(255,255,255,0.25);
  color: #FFFFFF;
  background: rgba(255,255,255,0.08);
  border-radius: 20px;
  font-size: 0.95rem;
  transition: background 0.2s, border-color 0.2s;
}
.publication-links .button:hover {
  background: rgba(255,255,255,0.18);
  border-color: rgba(255,255,255,0.45);
  color: #FFFFFF;
}
.publication-links .button .icon {
  margin-right: 0.3rem;
}
.publication-links .button.is-static-link,
.publication-links .button.is-static-link:hover {
  cursor: default;
  opacity: 0.6;
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.25);
}

/* --- Teaser Section --- */
.teaser-section {
  padding: 2.5rem 1.5rem 1.5rem;
  background: var(--color-surface);
}
.teaser-section video {
  width: 100%;
  border-radius: var(--carousel-radius);
}
.teaser-caption {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  margin-top: 0.75rem;
  text-align: center;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* --- Abstract Section --- */
.abstract-section {
  padding: 3rem 1.5rem;
  background: var(--color-bg-light);
}
.abstract-section .content {
  font-size: 1.05rem;
  line-height: 1.75;
}

/* --- Method Section --- */
.method-section {
  padding: 3rem 1.5rem;
  background: var(--color-surface);
}
.method-section .method-figure {
  width: 100%;
  border-radius: var(--carousel-radius);
}
.method-caption {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin-top: 1rem;
  text-align: center;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

/* --- Results Section --- */
.results-section {
  padding: 3rem 1.5rem 2rem;
  background: var(--color-bg-light);
}
.results-section .section-title {
  margin-bottom: 2rem;
}
.results-section .subsection-title {
  margin-top: 2.5rem;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}
.results-section .dataset-title {
  margin-bottom: 1rem;
  color: var(--color-text-secondary);
  font-family: var(--font-body);
  font-weight: 600;
}

/* --- Comparison Carousel --- */
.comparison-carousel {
  position: relative;
  margin-bottom: 2.5rem;
  background: var(--color-surface);
  border-radius: var(--carousel-radius);
  padding: 1.25rem 1rem 1rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
}

.carousel-inner {
  position: relative;
  overflow: hidden;
}

.carousel-slide {
  display: none;
  width: 100%;
  opacity: 0;
  transition: opacity 0.35s ease;
}
.carousel-slide.active {
  display: block;
  opacity: 1;
}

/* --- Comparison Panels (the 5 columns) --- */
.comparison-panels {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.6rem;
}

.panel {
  flex: 1;
  min-width: 0;
  text-align: center;
  display: flex;
  flex-direction: column;
  /* override Bulma .panel defaults (the class name collides) */
  box-shadow: none;
  border-radius: 0;
  font-size: inherit;
}

.panel-label {
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--color-text);
  margin-bottom: 0.4rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.panel-media {
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.panel-media img,
.panel-media video {
  width: 100%;
  height: auto;
  object-fit: contain;
  object-position: center center;
  border-radius: 4px;
  background: #000;
  display: block;
}

/* Force a 1:1 container using the padding-bottom trick.
   height:0 + padding-bottom:100% is bulletproof — padding percentage
   is always relative to the element's width, so this is always square
   and content can never push it taller. */
.panel-media.single-media {
  position: relative;
  height: 0;
  padding-bottom: 100%;
}

.panel-media.single-media > img,
.panel-media.single-media > video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* --- RealCars 5-panel row: wider GT (2 horizontal stills) + 4 videos --- */
.realcars-main-panels {
  display: grid;
  grid-template-columns: 1.9fr repeat(4, 1fr);
  gap: 0.6rem;
  margin-bottom: 0.85rem;
}

/* GT panel has two stills side-by-side. Use the same square padding-trick
   as single-media so heights match the video panels. */
.panel-stacked-h .panel-media {
  position: relative;
  height: 0;
  padding-bottom: 52.5%;   /* matches the wider 1.9fr column so tiles ~= square */
}
.stacked-images-h {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: row;
  gap: 0.3rem;
  width: 100%;
  height: 100%;
}
.stacked-item-h {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.stacked-item-h img {
  width: 100%;
  flex: 1;
  min-height: 0;
  object-fit: contain;
  border-radius: 3px;
  background: #fff;
  display: block;
}

/* --- Stacked Intermediate Panel --- */
.panel-stacked .panel-media {
  aspect-ratio: auto;
}

.stacked-images {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  width: 100%;
  height: 100%;
}

.stacked-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 0;
}

.sub-label {
  font-size: 0.65rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.15rem;
  white-space: nowrap;
}

.stacked-item img {
  width: 100%;
  flex: 1;
  min-height: 0;
  object-fit: contain;
  border-radius: 3px;
  background: #000;
  display: block;
}

/* Scene results layout: split clean comparison row + mechanism row */
.scene-main-panels {
  margin-bottom: 0.85rem;
}

.object-main-panels {
  margin-bottom: 0.85rem;
}

.intermediate-row {
  display: none;
}

.comparison-carousel.show-intermediate .intermediate-row {
  display: block;
}

.intermediate-toggle {
  display: block;
  margin: 0.1rem auto 0.75rem;
  border: 1px solid var(--color-border);
  background: var(--color-bg-light);
  color: var(--color-text);
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

.intermediate-toggle:hover {
  background: #EEF2FF;
  border-color: #BFDBFE;
}

/* Width tuned so each mechanism item matches one top-row panel width
   (top row = 4 cols of 1fr with gap 0.6rem). Keeps items square AND
   the same height as panels above. */
.scene-mechanism {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.6rem;
  max-width: calc(75% - 0.15rem);
  margin: 0 auto;
}

.object-mechanism {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.6rem;
  max-width: calc(50% - 0.3rem);
  margin: 0 auto;
}

.scene-mechanism .mechanism-item,
.object-mechanism .mechanism-item {
  text-align: center;
}

.scene-mechanism .sub-label,
.object-mechanism .sub-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 0.3rem;
}

/* Intermediate panels: inherit the same square 1:1 single-media treatment
   as the top row, with a transparent background so there's no black
   letterboxing around contain'd images. */
.scene-mechanism .panel-media img,
.object-mechanism .panel-media img {
  background: transparent;
  border-radius: 4px;
}

/* --- Carousel Controls --- */
.carousel-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 1rem;
  user-select: none;
}

.carousel-arrow {
  background: var(--color-primary);
  color: #FFFFFF;
  border: none;
  border-radius: 50%;
  width: 34px;
  height: 34px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  transition: background 0.2s, transform 0.15s;
  flex-shrink: 0;
}
.carousel-arrow:hover {
  background: var(--color-primary-dark);
  transform: scale(1.08);
}
.carousel-arrow:active {
  transform: scale(0.95);
}

.carousel-dots {
  display: flex;
  gap: 6px;
  align-items: center;
}

.carousel-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--color-border);
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
  padding: 0;
}
.carousel-dot.active {
  background: var(--color-primary);
  transform: scale(1.2);
}
.carousel-dot:hover:not(.active) {
  background: #94A3B8;
}

.carousel-counter {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  min-width: 3em;
  text-align: center;
}

/* --- Placeholder for missing assets --- */
.panel-placeholder {
  width: 100%;
  aspect-ratio: 1 / 1;
  background: #F1F5F9;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #94A3B8;
  font-size: 0.8rem;
}

/* --- BibTeX Section --- */
.bibtex-section {
  padding: 3rem 1.5rem;
  background: var(--color-surface);
}
.bibtex-section pre {
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: var(--carousel-radius);
  padding: 1.25rem;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.6;
}

/* --- Footer --- */
.site-footer {
  background: var(--color-bg-light);
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--color-border);
}
.site-footer p {
  color: var(--color-text-secondary);
  font-size: 0.85rem;
}

/* --- Real Robot Wrist Camera --- */
.robot-wrist {
  background: var(--color-surface);
  border-radius: var(--carousel-radius);
  padding: 1.5rem 1rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  margin-bottom: 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.robot-wrist figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.robot-wrist figcaption {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}
.robot-wrist .robot-sequence {
  width: 600px;
  max-width: 100%;
  border-radius: 6px;
  margin-bottom: 2.5rem;
}
.robot-pipeline {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--color-border);
  width: 100%;
}
.robot-stage-images {
  display: flex;
  gap: 0.75rem;
}
.robot-stage-images img {
  width: 140px;
  height: 140px;
  object-fit: cover;
  border-radius: 6px;
  background: var(--color-bg-light);
}
.robot-stage-images img.crop-corner {
  object-position: bottom right;
}
.robot-arrow {
  color: var(--color-border);
  font-size: 1.4rem;
  margin-top: 5.5rem;
}
.robot-baselines {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
}
.robot-baselines video {
  width: 200px;
  height: 200px;
  border-radius: 6px;
  background: var(--color-bg-light);
}

/* --- Responsive --- */
@media screen and (max-width: 1023px) {
  .hero-section .publication-title {
    font-size: 1.8rem;
  }
  .comparison-panels {
    grid-template-columns: repeat(2, 1fr);
  }
  .realcars-main-panels {
    grid-template-columns: repeat(2, 1fr);
  }
  .panel-stacked-h .panel-media {
    padding-bottom: 50%;
  }
  .scene-mechanism {
    grid-template-columns: 1fr;
    max-width: 100%;
  }
  .object-mechanism {
    grid-template-columns: 1fr;
    max-width: 100%;
  }
  .robot-pipeline {
    flex-direction: column;
    align-items: center;
  }
  .robot-arrow {
    transform: rotate(90deg);
    margin: 0.5rem 0;
  }
}

@media screen and (max-width: 600px) {
  .hero-section .publication-title {
    font-size: 1.4rem;
  }
  .comparison-panels {
    grid-template-columns: 1fr;
  }
  .robot-stage-images img {
    width: 120px;
    height: 120px;
  }
  .carousel-arrow {
    width: 30px;
    height: 30px;
    font-size: 0.75rem;
  }
}