/* Global */
:root {
  --color-primary: #1772d0;
  --color-border: #d6e4ff;
  --color-caption-bg: #eef6ff;
  --color-caption-text: #123769;
  --color-bg: #fff;
  --font-sans: 'Lato', 'Microsoft YaHei', sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: #333;
  line-height: 1.6;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 20px 48px;
}

/* Header */
.header {
  text-align: center;
  margin-bottom: 2rem;
}

.title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 0.5rem;
  line-height: 1.3;
}

.venue {
  font-size: 1.1rem;
  color: #555;
  margin: 0 0 1rem;
}

.authors {
  list-style: none;
  padding: 0;
  margin: 0 0 0.25rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1rem;
}

.authors a {
  color: var(--color-primary);
  text-decoration: none;
}

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

.affiliations {
  font-size: 0.9rem;
  color: #666;
  margin: 0 0 1rem;
}

.links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: var(--color-primary);
  color: #fff !important;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 700;
  font-size: 0.95rem;
}

.btn:hover {
  filter: brightness(1.1);
}

.btn-secondary {
  background: #555;
  border: none;
  cursor: pointer;
  color: #fff;
  font-family: inherit;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-weight: 700;
}

.btn-secondary:hover {
  background: #333;
}

/* Sections */
.section {
  margin-bottom: 2.5rem;
}

.section-title {
  font-size: 1.35rem;
  color: var(--color-primary);
  margin: 0 0 1rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.5rem;
}

/* TL;DR */
.tldr {
  background: var(--color-caption-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1rem 1.25rem;
}

.tldr-text {
  margin: 0;
  color: var(--color-caption-text);
}

/* Video */
.video-wrap {
  position: relative;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: #f0f0f0;
}

.demo-video {
  display: block;
  width: 100%;
  height: auto;
}

/* Digital Exhibition: floating panel + responsive immersive layout */
.section-exhibition .exhibition-wrap {
  width: 100%;
  min-height: 70vh;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: #000;
}

.exhibition-model-cards {
  margin-bottom: 1.5rem;
}

.mesh-card-import .mesh-caption {
  margin-bottom: 0;
}

.mesh-card-import .btn-import {
  display: block;
  width: 100%;
  margin: 0;
  padding: 10px 16px;
  min-height: 40px;
  border: none;
  border-radius: 0;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  font-family: inherit;
}

.mesh-card-import .btn-import:hover {
  filter: brightness(1.1);
}

.section-exhibition .exhibition-iframe {
  display: block;
  width: 100%;
  height: 70vh;
  min-height: 500px;
  border: none;
}

.section-exhibition .exhibition-controls-block {
  margin-top: 1rem;
  padding: 14px;
  border: 1px solid rgba(214, 228, 255, 0.8);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.55);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.section-exhibition .exhibition-controls-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 12px;
  align-items: stretch;
}

.section-exhibition .exhibition-control-group {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 12px;
  border: 1px solid rgba(214, 228, 255, 0.9);
  border-radius: 10px;
  background: rgba(238, 246, 255, 0.78);
}

.section-exhibition .exhibition-control-group h4 {
  margin: 0 0 10px;
  font-size: 0.95rem;
  color: var(--color-caption-text);
}

.section-exhibition .exhibition-primary-btn {
  width: 100%;
  padding: 10px 12px;
  border: none;
  border-radius: 8px;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

.section-exhibition .exhibition-primary-btn:hover {
  filter: brightness(1.08);
}

.section-exhibition .exhibition-file-tip {
  margin: 8px 0 0;
  font-size: 0.82rem;
  color: #42618b;
  word-break: break-all;
}

.section-exhibition .exhibition-param-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.section-exhibition .exhibition-ctrl-btn {
  width: 36px;
  height: 36px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: #fff;
  color: #2f4e7a;
  font-weight: 700;
  cursor: pointer;
}

.section-exhibition .exhibition-param-input {
  flex: 1;
  min-width: 0;
  height: 36px;
  padding: 0 8px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: #fff;
  color: #23406c;
  text-align: center;
}

.section-exhibition .exhibition-param-slider {
  width: 100%;
  margin: 10px 0 12px;
}

.section-exhibition .exhibition-reset-btn {
  display: inline-block;
  margin-top: auto;
  padding: 6px 10px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: #fff;
  color: #27466f;
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.1s ease;
}

.section-exhibition .exhibition-reset-btn:active {
  transform: scale(0.95);
  background: #eaf2ff;
}

.section-exhibition .exhibition-rotate-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.section-exhibition .exhibition-rotate-btn {
  padding: 8px 10px;
  border: none;
  border-radius: 8px;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

.section-exhibition .exhibition-shortcut-tip {
  margin-top: 10px;
  padding: 8px 10px;
  border-radius: 8px;
  background: rgba(23, 114, 208, 0.09);
  border: 1px solid rgba(23, 114, 208, 0.18);
}

.section-exhibition .exhibition-shortcut-tip p {
  margin: 0;
  color: #284b78;
  font-size: 0.82rem;
}

@media (max-width: 768px) {
  .section-exhibition .exhibition-iframe {
    height: 60vh;
    min-height: 400px;
  }

  .section-exhibition .exhibition-controls-grid {
    grid-template-columns: 1fr;
  }
}

/* 3D Caption: mesh grid */
.mesh-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.mesh-card {
  border: 1px solid var(--color-border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--color-bg);
}

.mesh-card model-viewer {
  width: 100%;
  height: 260px;
  display: block;
}

.mesh-caption {
  padding: 14px;
  background: var(--color-caption-bg);
  color: var(--color-caption-text);
  margin: 0;
  font-size: 0.95rem;
}

.mesh-model-error {
  margin: 0;
  padding: 8px 12px;
  font-size: 0.82rem;
  color: #8b1d1d;
  background: #fff0f0;
  border-top: 1px solid #f3c2c2;
}

/* 3D-QA: left viewer, right QA list */
.qa-row {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 1.5rem;
  align-items: start;
  margin-bottom: 2rem;
}

.qa-row:last-of-type {
  margin-bottom: 0;
}

.qa-viewer model-viewer {
  width: 100%;
  height: 260px;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.qa-list p {
  margin: 0.35rem 0;
  font-size: 0.95rem;
}

/* VaseEval: 3 columns */
.vaseeval-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.vaseeval-card {
  text-align: center;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--color-bg);
}

.vaseeval-card h3 {
  margin: 0;
  padding: 0.75rem;
  font-size: 1rem;
  background: var(--color-caption-bg);
  color: var(--color-caption-text);
}

.vaseeval-card model-viewer {
  width: 100%;
  height: 220px;
  display: block;
}

/* Method figures */
.method-desc {
  margin: 0 0 1rem;
  color: #555;
  font-size: 0.95rem;
}

.architecture-figure {
  margin: 0;
  text-align: center;
}

.architecture-figure img {
  display: block;
  width: 100%;
  max-width: 920px;
  height: auto;
  margin: 0 auto;
  border: 1px solid var(--color-border);
  border-radius: 12px;
}

.architecture-caption {
  margin-top: 0.75rem;
  color: var(--color-caption-text);
  font-size: 0.95rem;
}

.method-fig {
  margin-top: 0.5rem;
}

.method-fig img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--color-border);
  border-radius: 8px;
}

/* BibTeX */
#bibtex {
  background: #f5f5f5;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  font-size: 0.9rem;
  margin: 0 0 1rem;
  white-space: pre;
  font-family: 'Consolas', 'Monaco', monospace;
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 16px 12px 32px;
  }

  .title {
    font-size: 1.35rem;
  }

  .authors {
    flex-direction: column;
    align-items: center;
  }

  .qa-row {
    grid-template-columns: 1fr;
  }

  .qa-viewer model-viewer {
    max-width: 280px;
    margin: 0 auto;
  }

  .vaseeval-grid {
    grid-template-columns: 1fr;
  }
}