:root{
    --bg: #ffffff;
    --text: #111827;
    --muted: #6b7280;
    --line: #e5e7eb;
    --link: #111827;
    --btn: #111827;
    --btnText: #ffffff;
    --btnGhostBg: #ffffff;
    --btnGhostText: #111827;
    --maxw: 980px;
    --radius: 14px;
  }
  
  * { box-sizing: border-box; }
  html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text); }
  body{
    font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
    line-height: 1.65;
  }
  
  a{ color: var(--link); text-decoration: none; border-bottom: 1px solid rgba(17,24,39,0.25); }
  a:hover{ border-bottom-color: rgba(17,24,39,0.6); }
  
  .container{
    width: 100%;
    max-width: 1040px;
    margin: 0 auto;
    padding: 0 24px 48px;
  }
  
  .site-header{
    position: sticky;
    top: 0;
    z-index: 10;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #eef2f7;
  }
  
  .topnav{
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 0;
    gap: 24px;
  }
  
  .brand{
    font-weight: 700;
    border-bottom: none;
    font-size: 18px;
  }
  
  .navlinks{
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
  }
  
  .navlinks a{
    font-size: 15px;
    color: var(--muted);
    border-bottom: none;
  }
  .navlinks a:hover{ color: var(--text); }
  
  .hero{
    padding: 48px 0 18px;
    text-align: center;
    max-width: 920px;
    margin: 0 auto;
  }
  .title{
    font-size: clamp(30px, 4.2vw, 48px);
    line-height: 1.18;
    margin: 6px 0 14px;
    letter-spacing: -0.01em;
    font-weight: 800;
  }
  
  .authors{
    text-align: center;
  }
  .authors p{
    margin: 8px 0;
    font-size: 17px;
    font-weight: 600;
  }
  .authors a{
    color: #0f172a;
  }
  .affiliations{
    color: #334155;
    font-size: 16px;
  }
  .venue{
    color: var(--muted);
    font-size: 15px;
    margin-top: 6px;
    text-transform: uppercase;
    letter-spacing: 0.12em;
  }
  
  .dot{ margin: 0 10px; color: var(--line); }
  
  .buttons{
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 18px 0 16px;
    justify-content: center;
  }
  
  .btn{
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 18px;
    border-radius: 999px;
    background: #f59e0b;
    color: #ffffff;
    border: 1px solid #f59e0b;
    font-size: 14px;
    font-weight: 600;
    border-bottom: none;
    transition: transform 0.12s ease-out, box-shadow 0.12s ease-out, filter 0.12s ease-out;
    box-shadow: 0 6px 14px rgba(245,158,11,0.25);
  }
  
  .btn:hover{
    filter: brightness(0.98);
    transform: translateY(-1px);
    box-shadow: 0 8px 18px rgba(245,158,11,0.28);
  }
  .btn-ghost{
    background: var(--btnGhostBg);
    color: var(--btnGhostText);
    border: 1px solid var(--line);
  }
  .btn-ghost:hover{ border-color: #cbd5e1; }
  
  .tagline{
    color: #1f2937;
    font-size: 17px;
    margin: 10px auto 18px;
    max-width: 760px;
    font-weight: 400;
    font-style: italic;
    text-shadow: 0 1px 0 rgba(15,23,42,0.08);
  }
  
  .section{
    padding: 30px 0;
    border-top: 1px solid #eef2f7;
    max-width: 920px;
    margin: 0 auto;
  }
  
  .section h2{
    margin: 0 0 12px;
    font-size: 24px;
    letter-spacing: -0.01em;
    text-align: center;
  }
  
  .section p:not(.section-subtitle){
    color: #1f2937;
    font-size: 16px;
    text-align: justify;
    text-justify: inter-word;
  }

  .section-subtitle{
    margin: 0 0 16px;
    font-size: 14px;
    color: #94a3b8;
    text-align: center;
    width: 100%;
    display: block;
  }
  
  .figure{
    margin: 22px auto 0;
    padding: 0;
    border-radius: 18px;
    border: 1px solid #eef2f7;
    overflow: hidden;
    box-shadow: 0 10px 28px rgba(15,23,42,0.12);
    width: 100%;
    max-width: 920px;
    background: #000;
  }
  
  .figure img,
  .figure video{
    width: 100%;
    height: auto;
    display: block;
    max-width: 100%;
  }
  
  .figure video{
    aspect-ratio: 16 / 9;
    object-fit: cover;
  }

  .pdf-embed{
    width: 100%;
    height: 560px;
    display: block;
    border: 0;
    background: #ffffff;
  }
  
  .figure figcaption{
    margin: 0;
    padding: 12px 18px 14px;
    color: var(--muted);
    font-size: 14px;
    background: #ffffff;
  }
  
  .video-grid{
    display: block;
  }
  
  .video{
    width: 100%;
    max-width: 920px;
    margin: 0 auto;
    border: 1px solid #eef2f7;
    border-radius: 18px;
    overflow: hidden;
    box-shadow: 0 10px 28px rgba(15,23,42,0.12);
  }
  
  .video iframe{
    width: 100%;
    aspect-ratio: 16/9;
    display: block;
  }
  
  .video-notes{
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 14px;
    color: var(--muted);
  }
  .video-notes ul{ margin: 0; padding-left: 18px; }
  
  .steps{ margin-top: 16px; display: grid; gap: 10px; }
  .step{
    display: grid;
    grid-template-columns: 40px 1fr;
    gap: 12px;
    padding: 12px 14px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
  }
  .step-num{
    width: 34px; height: 34px;
    border-radius: 999px;
    border: 1px solid var(--line);
    display: grid;
    place-items: center;
    font-weight: 700;
    color: var(--muted);
  }
  .step-title{ font-weight: 700; }
  .step-text{ color: var(--muted); }

  .results-grid{
    margin-top: 18px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    align-items: start;
  }

  .results-item{
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 100%;
  }

  .results-label{
    margin: 0;
    font-size: 15px;
    color: #0f172a;
    text-align: center;
    font-weight: 600;
    width: 100%;
    height: 56px;
    line-height: 1.35;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .results-video{
    width: 100%;
    display: block;
    border-radius: 16px;
    border: 1px solid #eef2f7;
    box-shadow: 0 10px 28px rgba(15,23,42,0.12);
    background: #000;
    aspect-ratio: 16 / 9;
    object-fit: cover;
  }
  
  .gallery{
    margin-top: 14px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
  }
  .gallery img{
    width: 100%;
    height: auto;
    border-radius: 12px;
    border: 1px solid var(--line);
  }
  
  .bibtex{
    background: #0b1020;
    color: #e5e7eb;
    padding: 14px;
    border-radius: var(--radius);
    overflow-x: auto;
    border: 1px solid rgba(255,255,255,0.08);
  }
  
  .footer{
    padding: 18px 0 40px;
    color: var(--muted);
    font-size: 14px;
  }
  
  .last-updated{
    color: var(--muted);
    font-size: 14px;
  }
  
  @media (max-width: 820px){
    .video-grid{ grid-template-columns: 1fr; }
    .gallery{ grid-template-columns: repeat(2, 1fr); }
    .navlinks{ display: none; } /* 简化移动端导航 */
    .results-grid{ grid-template-columns: 1fr; }
  }