/* PanoHK360 project page styles. */
body {
      margin: 0;
      font-family: Arial, sans-serif;
      min-height: 100vh;
      background: #f7f7f7;
      color: #222;
    }

    /* ── Header shell ── */
    header {
      text-align: center;
    }

    .header-top {
      display: grid;
      grid-template-columns: 300px minmax(0, 1fr) 300px;
      align-items: start;
      gap: 1rem;
      padding: 1.25rem 1rem 0;
      max-width: 1654px;
      width: 100%;
      margin: 0 auto;
      box-sizing: border-box;
    }

    .header-logo {
      width: 300px;
      height: 120px;
      display: flex;
      align-items: center;
      justify-content: flex-start;
    }

    .header-logo-right {
      justify-content: flex-end;
    }

    .header-logo-right a {
      justify-content: flex-end;
    }

    .header-logo a {
      display: flex;
      align-items: center;
      width: 100%;
      height: 100%;
    }

    .header-logo img {
      height: 120px;
      width: auto;
      max-width: 100%;
      object-fit: contain;
      mix-blend-mode: multiply;
    }

    .header-content {
      text-align: center;
      min-width: 0;
    }

    /* ── Title & venue ── */
    h1 {
      margin: 0;
      font-size: clamp(1.5rem, 4vw, 2.4rem);
      line-height: 1.25;
    }

    .venue {
      margin: 0.5rem 0 0;
      font-size: 1.15rem;
      font-style: italic;
      color: #666;
    }

    /* ── Authors & affiliation ── */
    .authors {
      margin: 0.6rem 0 0;
      font-size: 1.35rem;
      color: #333;
    }

    .affiliation {
      margin: 0.25rem 0 0;
      font-size: 1rem;
      color: #666;
    }

    /* ── Paper links ── */
    .paper-links {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 0.6rem;
      margin: 1rem 0 0;
    }

    .link-btn {
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
      padding: 0.45rem 1rem;
      background: #fff;
      border: 1.5px solid #ccc;
      border-radius: 6px;
      font-size: 0.95rem;
      font-weight: 600;
      color: #222;
      text-decoration: none;
      transition: border-color 0.15s, background 0.15s, color 0.15s;
    }

    .link-btn:hover,
    .link-btn:focus {
      border-color: #005eb8;
      background: #005eb8;
      color: #fff;
    }

    .link-btn i {
      font-size: 1.05rem;
    }

    /* ── System overview image ── */
    .system-overview-wrapper {
      overflow-x: auto;
      margin: 2rem 0 0;
    }

    .system-overview {
      max-width: 980px;
      width: 100%;
      min-width: 900px;
      display: block;
      margin: 0 auto;
    }

    .figure-hint {
      display: none;
      text-align: center;
      font-size: 0.8rem;
      color: #999;
      margin: 0.4rem 0 0;
    }

    @media (hover: hover) and (pointer: fine) and (max-width: 1024px) {
      .figure-hint { display: block; }
      .system-overview-wrapper { padding-bottom: 10px; }
    }

    @media (hover: none), (pointer: coarse) {
      .system-overview-wrapper {
        overflow-x: scroll;
        padding-bottom: 10px;
      }

      .system-overview-wrapper::-webkit-scrollbar {
        height: 6px;
      }

      .system-overview-wrapper::-webkit-scrollbar-track {
        background: #e8e8e8;
        border-radius: 3px;
      }

      .system-overview-wrapper::-webkit-scrollbar-thumb {
        background: #aaa;
        border-radius: 3px;
      }
    }

    /* ── Main content ── */
    main {
      display: flex;
      justify-content: center;
      padding: 3rem 2rem 2rem;
    }

    .content-stack {
      max-width: 980px;
      width: 100%;
      min-width: 0;
      display: grid;
      gap: 1rem;
    }

    .abstract,
    .dataset,
    .citation,
    .video-embed {
      border: 1px solid #e4e4e4;
      border-radius: 10px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    }

    .abstract,
    .dataset,
    .citation {
      text-align: justify;
      width: 100%;
      min-width: 0;
      background: #fff;
      padding: 1.25rem 1.5rem;
      box-sizing: border-box;
      overflow: hidden;
    }

    .abstract h2,
    .dataset h2,
    .citation h2 {
      margin: 0 0 0.75rem;
      font-size: 1.35rem;
      color: #1f1f1f;
    }

    .abstract p,
    .dataset p,
    .citation p {
      font-size: 1.05rem;
      line-height: 1.7;
      color: #333;
    }

    .dataset p+p,
    .citation p+p {
      margin-top: 0.75rem;
    }

    .video-embed {
      width: 100%;
      background: #000;
      overflow: hidden;
      aspect-ratio: 16 / 9;
    }

    .video-embed iframe {
      width: 100%;
      height: 100%;
      border: none;
      display: block;
    }

    .bibtex {
      margin: 0.75rem 0 0;
      padding: 1rem 1.1rem;
      background: #f4f4f4;
      border: 1px solid #ddd;
      border-radius: 6px;
      font-family: "Courier New", Courier, monospace;
      font-size: 0.9rem;
      line-height: 1.6;
      color: #333;
      white-space: pre;
      overflow-x: auto;
      width: 100%;
      box-sizing: border-box;
      min-width: 0;
    }

    .dataset a {
      color: #005eb8;
      text-decoration: none;
      font-weight: 600;
    }

    .dataset a:hover,
    .dataset a:focus {
      text-decoration: underline;
    }

    @media (max-width: 1280px) {
      .header-top {
        grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
        grid-template-rows: auto auto;
      }

      .header-logo { grid-row: 1; }
      .header-logo-right { justify-self: end; }
      .header-content { grid-column: 1 / -1; grid-row: 2; }
    }

    /* ── Responsive: tablet ── */
    @media (max-width: 1024px) {
      main {
        padding: 2rem 1.5rem 1.5rem;
      }

      .authors {
        font-size: 1.15rem;
      }

      .abstract p,
      .dataset p,
      .citation p {
        font-size: 1rem;
      }
    }

    /* ── Responsive: mobile ── */
    @media (max-width: 768px) {
      .header-top {
        grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
        grid-template-rows: auto auto;
        justify-content: stretch;
        gap: 0.75rem;
        padding: 1rem 1rem 0;
      }

      .header-logo {
        grid-row: 1;
        justify-content: flex-start;
        width: 100%;
        max-width: 220px;
        height: 80px;
      }

      .header-content {
        grid-column: 1 / -1;
        grid-row: 2;
      }

      .header-logo img {
        height: 80px;
      }

      .header-logo-right { justify-content: flex-end; }

      .authors {
        font-size: 1rem;
      }

      .affiliation {
        font-size: 0.9rem;
      }

      .abstract,
      .dataset,
      .citation {
        padding: 1rem 1.1rem;
      }

      .abstract p,
      .dataset p,
      .citation p {
        font-size: 0.95rem;
      }

      .bibtex {
        font-size: 0.75rem;
        padding: 0.75rem 0.85rem;
      }

      .link-btn {
        font-size: 0.88rem;
        padding: 0.4rem 0.75rem;
      }

      main {
        padding: 1.25rem 0.75rem 1.5rem;
      }
    }

/* PanoHK360: local content and accessible resource placeholders. */
* { box-sizing: border-box; }
.header-content { width: 100%; }
.system-overview { height: auto; }
.authors { line-height: 1.6; }
.author { display: inline-block; }
.author sup { font-size: .7em; margin-left: .1em; }
.corresponding-note { margin: .15rem 0 0; color: #666; font-size: .85rem; }
.venue a { color: inherit; text-decoration: none; }
.venue a:hover { color: #005eb8; text-decoration: underline; }
.venue a:focus-visible { outline: 3px solid #005eb8; outline-offset: 3px; }
.header-logo a:focus-visible { outline: 3px solid #005eb8; outline-offset: 3px; }
.authors a { color: inherit; text-decoration: none; }
.authors a:hover { color: #005eb8; text-decoration: underline; }
.link-btn { font-family: inherit; line-height: 1.2; }
.link-btn svg { width: 17px; height: 17px; flex-shrink: 0; }
.link-btn:disabled { color: #888; border-color: #ddd; background: #f0f0f0; cursor: default; }
.link-btn:focus-visible, .copy-btn:focus-visible { outline: 3px solid #005eb8; outline-offset: 3px; }
.system-overview-wrapper:focus-visible { outline: 3px solid #005eb8; outline-offset: -3px; }
.figure-caption { max-width: 980px; margin: .75rem auto 0; padding: 0 1rem; color: #666; font-size: .9rem; line-height: 1.6; text-align: center; }
.video-player { aspect-ratio: 2 / 1; }
.video-player video { width: 100%; height: 100%; object-fit: contain; display: block; }
.dataset-figure { margin: 1.25rem 0 .5rem; }
.dataset-figure img { width: 100%; height: auto; display: block; }
.dataset-figure figcaption { margin-top: .75rem; font-size: .85rem; line-height: 1.6; color: #666; text-align: left; }
.citation-heading { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: .75rem; }
.citation-heading h2 { margin: 0; }
.copy-btn { border: 1px solid #ccc; background: #fff; border-radius: 6px; color: #555; padding: .4rem .65rem; font-family: inherit; cursor: pointer; font-size: .8rem; }
.copy-btn:hover { border-color: #005eb8; color: #005eb8; }
.bibtex { white-space: pre-wrap; overflow-wrap: anywhere; text-align: left; }
footer { text-align: center; padding: 0 1rem 2rem; font-size: .8rem; color: #999; line-height: 1.6; }
footer a { color: #777; text-decoration: none; }
footer a:hover { text-decoration: underline; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
@media (max-width: 768px) {
  .header-top { padding: 1.25rem 1rem 0; }
  h1 { font-size: clamp(1.5rem, 5vw, 2rem); }
  .system-overview { min-width: 900px; }
  .figure-hint { display: block; padding: 0 1rem; }
  .abstract, .dataset, .citation { text-align: left; }
  .figure-caption { font-size: .8rem; }
}
@media (prefers-reduced-motion: reduce) {
  .link-btn { transition: none; }
}