/* HPP trajectory viewer: shared by /HPP and /HPP/trajectories */
:root {
  --ink: #1f2328;
  --ink-2: #4a5568;
  --ink-3: #6a737d;
  --line: #e5e7eb;
  --soft: #f6f8fa;
  --band: #f3f5f8;
  --band-h: #e8ecf2;
  --grid: #dfe4eb;
  /* one colour per kind of probing, for marks, step bands and chips alike */
  --k-structure: #64748b;
  --k-subtitle: #d97706;
  --k-search: #2563eb;
  --k-frames: #0d9488;
  --k-zoom: #0d9488;
  --k-clip: #7c3aed;
  --k-vlm: #7c3aed;
  --k-answer: #16a34a;
  --k-think: #94a3b8;
  --ok: #15803d;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.k-structure { --kc: var(--k-structure); } .k-subtitle { --kc: var(--k-subtitle); } .k-search { --kc: var(--k-search); }
.k-frames { --kc: var(--k-frames); } .k-vlm { --kc: var(--k-vlm); } .k-answer { --kc: var(--k-answer); } .k-think { --kc: var(--k-think); }

/* ── trajectory card: question, answer, video and steps share one grid (a label column and a time column) ── */
.ht { --L: 12.25rem; position: relative; padding: 1.15rem 1.25rem 1rem; background: #fff; border: 1px solid #d8dee6;
      border-radius: 12px; box-shadow: 0 4px 18px rgba(15, 23, 42, .05); color: var(--ink); font-size: .9rem; text-align: left; }
.ht.flat { padding: 0; border: 0; border-radius: 0; box-shadow: none; }
.ht-row { display: grid; grid-template-columns: var(--L) minmax(0, 1fr); align-items: center; }
.ht-lab { display: flex; align-items: center; gap: .55rem; min-width: 0; padding: 0 .75rem 0 .85rem; color: var(--ink-3); font-size: .86rem; }
.ht-qa { align-items: baseline; }
.ht-qa + .ht-qa { margin-top: .6rem; }
.ht-q { margin: 0; font-size: 1rem; line-height: 1.55; }
.ht-q .nw { white-space: nowrap; }
.ht-q .len { color: var(--ink-3); }
.ht-arow { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .4rem 1rem; }
.ht-ans { display: inline-flex; align-items: center; gap: .35rem; padding: .1rem .75rem .1rem .55rem; border-radius: 999px;
          font-weight: 600; font-size: .93rem; color: var(--ok); background: #ecfdf3; border: 1px solid #bbf0cc; }
.ht-ans.no { color: var(--ink-2); background: var(--soft); border-color: var(--line); }
.ht-ans svg { width: 1em; height: 1em; flex: none; }
.ht-stat { color: var(--ink-3); font-size: .86rem; }
.ht-stat b { color: var(--ink); font-weight: 600; }
.ht-rule { height: 1px; margin: 1rem 0; background: var(--line); }
.ht-strip { display: flex; height: 46px; overflow: hidden; border-radius: 6px; background: var(--line); }
.ht-strip img { flex: 1 1 0; min-width: 0; height: 100%; object-fit: cover; }
.ht-axisrow { align-items: end; }
.ht-axisrow .ht-lab { padding-bottom: .1rem; }
.ht-axis { position: relative; height: 1.6rem; color: var(--ink-3); font-size: .75rem; font-variant-numeric: tabular-nums; }
.ht-axis span { position: absolute; top: .3rem; transform: translateX(-50%); white-space: nowrap; }
.ht-axis span:first-child { transform: none; }
.ht-axis span:last-child { transform: translateX(-100%); }

/* steps: each its own band, coloured by what it mainly did */
.ht-step { margin-top: 5px; color: var(--ink); text-decoration: none; cursor: pointer; user-select: none; }
.ht-step .ht-lab { align-self: stretch; height: 32px; padding-left: .6rem; background: var(--band); border-left: 3px solid var(--kc);
                   border-radius: 6px 0 0 6px; color: var(--ink); font-weight: 500; }
.ht-name { overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.ht-n { flex: none; display: inline-flex; align-items: center; justify-content: center; width: 1.35rem; height: 1.35rem;
        border-radius: 50%; background: var(--kc); color: #fff; font-size: .72rem; font-weight: 600; line-height: 1; }
.ht-track { position: relative; height: 32px; border-radius: 0 6px 6px 0;
            background: linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0 / 25% 100%, var(--band); }
.ht-step:hover .ht-lab, .ht-step:hover .ht-track { background-color: var(--band-h); }
.ht-step:focus-visible { outline: 2px solid var(--k-search); outline-offset: 2px; border-radius: 6px; }

.mk { position: absolute; top: 50%; transform: translateY(-50%); border-radius: 3px; z-index: 1; }
.mk.structure { height: 3px; background: var(--k-structure); opacity: .5; border-radius: 2px; }
.mk.subtitle { width: 3px; height: 16px; background: var(--k-subtitle); border-radius: 1px; transform: translate(-50%, -50%); }
.mk.search { height: 14px; min-width: 4px; background: var(--k-search); opacity: .8; }
.mk.frames { height: 9px; min-width: 3px; background: var(--k-frames); opacity: .6; }
.mk.zoom { height: 22px; min-width: 6px; border: 2px solid var(--k-zoom); background: rgba(13, 148, 136, .1); border-radius: 5px; }
.mk.clip { height: 18px; min-width: 6px; border: 1.5px solid var(--k-clip); background: rgba(124, 58, 237, .16); }
.mk.vlm { width: 10px; height: 10px; border-radius: 50%; background: var(--k-vlm); border: 1.5px solid #fff;
          transform: translate(-50%, -50%); z-index: 2; transition: transform .12s; }
.mk.vlm:hover { transform: translate(-50%, -50%) scale(1.6); }
.ht-final { position: absolute; right: .5rem; top: 50%; transform: translateY(-50%); padding: .22rem .55rem; border-radius: 999px;
            font: 600 .74rem/1 var(--mono); color: var(--ok); background: #ecfdf3; border: 1px solid #bbf0cc; }

.ht-legendrow { margin-top: .8rem; }
.ht-legend { display: flex; flex-wrap: wrap; gap: .3rem 1.1rem; color: var(--ink-3); font-size: .78rem; }
.ht-legend span { display: inline-flex; align-items: center; gap: .4rem; white-space: nowrap; }
.ht-legend i { display: inline-block; width: 16px; height: 10px; border-radius: 2px; }
.ht-legend i.structure { height: 3px; background: var(--k-structure); opacity: .5; }
.ht-legend i.subtitle { width: 3px; height: 13px; background: var(--k-subtitle); }
.ht-legend i.search { background: var(--k-search); opacity: .8; }
.ht-legend i.frames { height: 8px; background: var(--k-frames); opacity: .6; }
.ht-legend i.zoom { height: 12px; border: 2px solid var(--k-zoom); background: rgba(13, 148, 136, .1); border-radius: 3px; }
.ht-legend i.clip { border: 1.5px solid var(--k-clip); background: rgba(124, 58, 237, .16); }
.ht-legend i.vlm { width: 10px; height: 10px; border-radius: 50%; background: var(--k-vlm); }

.ht-tip { position: absolute; z-index: 5; width: 180px; padding: 4px; background: #fff; border: 1px solid #d0d7de; border-radius: 8px;
          box-shadow: 0 8px 24px rgba(15, 23, 42, .16); transform: translate(-50%, calc(-100% - 10px)); opacity: 0;
          pointer-events: none; transition: opacity .12s; }
.ht-tip.on { opacity: 1; }
.ht-tip img { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border-radius: 5px; background: var(--line); }
.ht-tip span { display: block; padding: .25rem .2rem .05rem; color: var(--ink-2); font-size: .74rem; }

/* ── tool chips ───────────────────────────────────────────────── */
.chip { display: inline-block; font: 500 .72rem/1.5 var(--mono); padding: 0 .45rem; border-radius: 999px;
        border: 1px solid currentColor; white-space: nowrap; background: #fff; }
.chip.structure { color: var(--k-structure); } .chip.search { color: var(--k-search); }
.chip.subtitle { color: #b45309; } .chip.frames { color: var(--k-frames); }
.chip.zoom { color: var(--k-zoom); } .chip.clip { color: var(--k-clip); } .chip.vlm { color: var(--k-vlm); }

/* ── trajectories page: thumbnails to pick a video, then that trajectory ── */
.tx-thumbs { display: grid; grid-template-columns: repeat(5, minmax(0, 140px)); justify-content: center; gap: .8rem .8rem; margin: 0 0 1.6rem; }
.tx-thumb { display: block; min-width: 0; color: var(--ink-3); font-size: .72rem; text-decoration: none; }
.tx-frame { position: relative; display: block; overflow: hidden; border-radius: 6px; background: #111;
            transition: box-shadow .15s, opacity .15s, filter .15s; }
.tx-frame img { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
/* videos not being shown fade back: pale, grey and soft; the selected one stays sharp */
.tx-thumb:not(.on) .tx-frame { opacity: .35; filter: grayscale(1) blur(1px); }
.tx-thumb:not(.on) .tx-thumb-t { color: #a0a8b2; }
.tx-thumb:not(.on):hover .tx-frame { opacity: .85; filter: none; }
.tx-thumb:not(.on):hover .tx-thumb-t { color: var(--ink-2); }
.tx-thumb.on .tx-frame { box-shadow: 0 0 0 2px #fff, 0 0 0 4.5px #3f75ed; }
.tx-thumb.on .tx-thumb-t { color: var(--ink); font-weight: 600; }
.tx-play { position: absolute; left: 50%; top: 50%; width: 24px; height: 24px; transform: translate(-50%, -50%); }
.tx-thumb.on .tx-play { display: none; }
.tx-thumb-n { position: absolute; left: 4px; top: 4px; padding: 2px 4px; border-radius: 3px; background: rgba(0, 0, 0, .7); color: #fff;
              font: 600 .62rem/1 var(--mono); }
.tx-thumb.on .tx-thumb-n { background: #3f75ed; }
.tx-dur { position: absolute; right: 4px; bottom: 4px; padding: 2px 4px; border-radius: 3px; background: rgba(0, 0, 0, .75); color: #fff;
          font: 500 .6rem/1 var(--mono); }
.tx-thumb-t { display: block; margin-top: .35rem; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }

.tx { overflow: hidden; border: 1px solid #d0d7de; border-radius: 12px; box-shadow: 0 4px 18px rgba(15, 23, 42, .05); }
.tx-head { display: flex; align-items: center; gap: .65rem; padding: .8rem 1.25rem; background: #f3f5f8; border-bottom: 1px solid #d8dee6; }
.tx-title { margin: 0; font-size: 1.12rem; font-weight: 600; line-height: 1.35; }
.tx-n { flex: none; display: inline-flex; align-items: center; justify-content: center; width: 1.7rem; height: 1.7rem;
        border-radius: 50%; background: #3f75ed; color: #fff; font: 600 .8rem var(--mono); }
.tx-body { padding: 1.2rem 1.25rem 1.3rem; }

/* a step opens in place: its details hang under its row of the map, edged in the step's colour */
.tx .ht { --L: 13.75rem; }  /* room for the chevron */
.ht-chev { flex: none; width: 1rem; height: 1rem; margin-left: auto; color: var(--ink-3); transition: transform .15s; }
.ht-step[aria-expanded="true"] .ht-chev { transform: rotate(90deg); color: var(--ink); }
.ht-step[aria-expanded="true"] .ht-lab, .ht-step[aria-expanded="true"] .ht-track { background-color: var(--band-h); }
.ht-step[aria-expanded="true"] .ht-lab { border-radius: 6px 0 0 0; }
.ht-step[aria-expanded="true"] .ht-track { border-radius: 0 6px 0 0; }
.ht-step { scroll-margin-top: 1rem; }
.ht-step.flash .ht-lab, .ht-step.flash .ht-track { box-shadow: 0 0 0 3px #c7d2fe; }
.ht-detail { margin-bottom: .45rem; border: 1px solid #d8dee6; border-top: 0; border-left: 3px solid var(--kc);
             border-radius: 0 0 8px 8px; background: #fff; font-size: .93rem; }
.ht-detail-body { padding: .3rem .9rem .85rem; }
.ht-detail-meta { display: flex; flex-wrap: wrap; align-items: center; gap: .35rem .6rem; padding: .35rem 0 .1rem; }
.ht-chips { display: inline-flex; flex-wrap: wrap; gap: .25rem; }
.ht-secs { margin-left: auto; color: var(--ink-3); font-size: .76rem; font-variant-numeric: tabular-nums; }
.tx-all { flex: none; margin-left: auto; padding: .25rem .75rem; border: 1px solid #d0d7de; border-radius: 6px; background: #fff;
          color: var(--ink-2); font: inherit; font-size: .8rem; cursor: pointer; }
.tx-all:hover { background: var(--soft); color: var(--ink); }

.tv-intent { margin: .45rem 0 .5rem; font-size: .93rem; line-height: 1.6; color: var(--ink); }
.tv-intent p { margin: 0 0 .2rem; }
.tv-block + .tv-block { margin-top: .9rem; padding-top: .9rem; border-top: 1px dashed var(--line); }
details.tv-fold { margin: .35rem 0; }
details.tv-fold > summary { display: inline-block; cursor: pointer; list-style: none; color: var(--ink-3); font-size: .8rem; }
details.tv-fold > summary::-webkit-details-marker { display: none; }
details.tv-fold > summary::before { content: "▸"; display: inline-block; width: 1em; transition: transform .15s; }
details.tv-fold[open] > summary::before { transform: rotate(90deg); }
details.tv-fold > summary:hover { color: var(--ink); }
.tv-pre { margin: .4rem 0 0; padding: .7rem .85rem; max-height: 26rem; overflow: auto; background: var(--soft); border: 1px solid var(--line);
          border-radius: 6px; color: #24292f; font: .76rem/1.55 var(--mono); white-space: pre; }
.tv-pre .c { color: #6e7781; font-style: italic; } .tv-pre .s { color: #0a3069; } .tv-pre .n { color: #0550ae; }
.tv-pre .k { color: #1d4ed8; font-weight: 600; } .tv-pre .f { color: #6d28d9; font-weight: 600; }
.tv-vlm { margin: .55rem 0; padding: .65rem .75rem; border: 1px solid #e4dcfb; border-radius: 8px; background: #faf8ff; }
.tv-vlm-head { margin-bottom: .45rem; color: var(--k-vlm); font-size: .74rem; font-weight: 600; letter-spacing: .02em; }
.tv-frames { display: grid; grid-template-columns: repeat(auto-fill, minmax(92px, 1fr)); gap: 4px; margin-bottom: .5rem; }
.tv-frames figure { position: relative; margin: 0; }
.tv-frames img { display: block; width: 100%; aspect-ratio: 16 / 10; object-fit: cover; border-radius: 3px; background: var(--line); cursor: zoom-in; }
.tv-frames figcaption { position: absolute; left: 3px; bottom: 3px; padding: 2px 4px; border-radius: 2px; background: rgba(0, 0, 0, .6);
                        color: #fff; font: 500 .64rem/1 var(--mono); }
.tv-frames .more { display: flex; align-items: center; justify-content: center; aspect-ratio: 16 / 10; border: 1px dashed #cfc3f5;
                   border-radius: 3px; color: var(--ink-3); font-size: .72rem; }
.tv-q { margin: 0 0 .35rem; color: var(--ink-3); font-size: .8rem; line-height: 1.5; }
.tv-q b, .tv-a b.lbl { color: var(--ink-2); font-weight: 600; }
.tv-a { margin: 0; color: var(--ink); font-size: .86rem; line-height: 1.55; white-space: pre-wrap; }
.tv-a.clamp { display: -webkit-box; -webkit-line-clamp: 6; -webkit-box-orient: vertical; overflow: hidden; }
.tv-more { margin-top: .2rem; padding: 0; border: 0; background: none; color: var(--k-search); font: inherit; font-size: .78rem; cursor: pointer; }
.tv-final { display: inline-flex; align-items: center; gap: .6rem; margin-top: .5rem; padding: .45rem .8rem; border-radius: 8px;
            background: #ecfdf3; color: var(--ok); font: 600 1rem var(--mono); }
.tv-final span { color: var(--ink-2); font: 500 .82rem var(--font, inherit); }

.tv-lightbox { position: fixed; inset: 0; z-index: 50; display: flex; align-items: center; justify-content: center; padding: 1rem;
               background: rgba(0, 0, 0, .82); cursor: zoom-out; }
.tv-lightbox img { max-width: min(96vw, 900px); max-height: 86vh; border-radius: 4px; }
.tv-lightbox div { position: absolute; left: 0; right: 0; bottom: 1.2rem; color: #fff; font: .85rem var(--mono); text-align: center; }

@media (max-width: 640px) {
  .ht, .tx .ht { --L: 2.2rem; padding: .9rem .8rem .85rem; }
  .ht.flat { padding: 0; }
  .ht-qa { display: block; }
  .ht-qa .ht-lab { padding: 0 0 .15rem; font-size: .78rem; }
  .ht-video .ht-lab, .ht-axisrow .ht-lab { visibility: hidden; }
  .ht-step .ht-lab { justify-content: center; padding: 0 0 0 .1rem; }
  .ht-name { display: none; }
  .ht-strip { height: 34px; }
  .ht-final { right: .3rem; font-size: .68rem; }
  .tx-head { padding: .65rem .85rem; }
  .tx-body { padding: .9rem .85rem 1rem; }
  .ht-detail-body { padding: .2rem .65rem .7rem; }
  .ht-chips { display: none; }
  .ht-chev { display: none; }
  .tx-thumbs { grid-template-columns: repeat(5, minmax(0, 1fr)); gap: .45rem; }
  .tx-play { width: 18px; height: 18px; }
  .tx-dur, .tx-thumb-t { display: none; }
  .tv-frames { grid-template-columns: repeat(auto-fill, minmax(76px, 1fr)); }
}