/* Concept Videos hub (3 columns) and single video pages */
.vh-wrap { max-width: 1320px; margin: 0 auto; padding: 0 24px; }
.vh-head { padding: 40px 0 8px; }
.vh-head h1 { margin: 0 0 6px; }
.vh-grid { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 24px; align-items: start; margin: 24px 0 72px; }
.vh-left, .vh-right { position: sticky; top: 84px; max-height: calc(100vh - 100px); overflow-y: auto; }
.vh-left { background: #fff; border: 1.5px solid var(--line, #e2e8f0); border-radius: 12px; padding: 14px 12px; }
.vh-stream { margin: 14px 0 4px; padding: 0 8px; font-family: var(--font-data, monospace); font-size: 0.7rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--graphite, #64748b); }
.vh-stream:first-child { margin-top: 2px; }
.vh-chap { display: flex; justify-content: space-between; align-items: center; gap: 8px; width: 100%; text-align: left; font: inherit; font-size: 0.9rem; color: var(--ink, #14213D); background: none; border: 0; border-radius: 8px; padding: 8px; cursor: pointer; }
.vh-chap:hover { background: rgba(110,63,163,0.07); }
.vh-chap.is-active { background: var(--violet, #6E3FA3); color: #fff; }
.vh-chap .n { font-size: 0.75rem; opacity: 0.75; }
.vh-mid-title { margin: 0 0 12px; font-size: 1.05rem; font-family: var(--font-display, serif); }
.vh-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 16px; }
.vcard { display: flex; flex-direction: column; background: #fff; border: 1.5px solid var(--line, #e2e8f0); border-radius: 12px; overflow: hidden; text-decoration: none; color: inherit; box-shadow: 0 2px 8px rgba(20,33,61,0.04); transition: border-color .15s, box-shadow .15s; }
.vcard:hover { border-color: var(--violet, #6E3FA3); }
.vcard:hover { box-shadow: 0 6px 18px rgba(20,33,61,0.10); }
.vcard.is-hidden { display: none; }
.vthumb { position: relative; display: block; line-height: 0; aspect-ratio: 16/9; background: #0a1d52; overflow: hidden; }
.vthumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.vdur { position: absolute; right: 8px; bottom: 8px; background: rgba(0,0,0,0.82); color: #fff; font-size: 0.74rem; font-weight: 600; padding: 2px 6px; border-radius: 4px; line-height: 1.3; }
.vcard-body { padding: 10px 12px 12px; display: flex; flex-direction: column; gap: 4px; }
.vcard-title { font-family: var(--font-display, serif); font-weight: 600; font-size: 0.95rem; line-height: 1.35; }
.vcard-sub { font-size: 0.8rem; color: var(--ink-soft, #475569); }
.vtags { display: flex; gap: 6px; flex-wrap: wrap; }
.vtag { font-size: 0.66rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; color: var(--violet, #6E3FA3); background: rgba(110,63,163,0.08); padding: 2px 7px; border-radius: 4px; }
.vh-right .vp { background: #fff; border: 1.5px solid var(--line, #e2e8f0); border-radius: 12px; overflow: hidden; }
.vp[hidden] { display: none; }
.vp-body { padding: 16px 18px 18px; }
.vp-body h2 { font-family: var(--font-display, serif); font-size: 1.15rem; line-height: 1.35; margin: 8px 0 8px; }
.vp-body p { font-size: 0.92rem; line-height: 1.6; color: var(--ink-soft, #475569); margin: 0 0 10px; }
.vp-body .vp-hook { color: var(--ink, #14213D); font-style: italic; }
.vp-meta { font-size: 0.82rem; color: var(--graphite, #64748b); margin: 0 0 12px; }
.vp-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.vp-actions a { text-decoration: none; font-size: 0.88rem; font-weight: 600; padding: 8px 14px; border-radius: 8px; border: 1.5px solid var(--ink, #14213D); color: var(--ink, #14213D); }
.vp-actions a.primary { background: var(--violet, #6E3FA3); border-color: var(--violet, #6E3FA3); color: #fff; }
.vp-empty { padding: 28px 18px; color: var(--ink-soft, #475569); font-size: 0.92rem; }
.vh-foot { margin: -40px 0 56px; font-size: 0.9rem; color: var(--ink-soft, #475569); }
@media (max-width: 1100px) { .vh-grid { grid-template-columns: 210px minmax(0, 1fr); } }
@media (max-width: 900px) {
  .vh-grid { grid-template-columns: 1fr; }
  .vh-left, .vh-right { position: static; max-height: none; }
  .vh-left { display: flex; flex-wrap: wrap; gap: 6px; padding: 10px; }
  .vh-stream { width: 100%; margin: 8px 0 0; }
  .vh-chap { width: auto; border: 1.5px solid var(--line, #e2e8f0); border-radius: 999px; padding: 5px 12px; font-size: 0.82rem; }
}

/* single video page */
.vpage { max-width: 1040px; margin: 0 auto; padding: 24px 24px 72px; }
.vpage .crumbs { font-size: 0.85rem; color: var(--graphite, #64748b); margin-bottom: 12px; }
.vpage .crumbs a { color: inherit; }
.vpage h1 { font-family: var(--font-display, serif); font-size: clamp(1.5rem, 3vw, 2.1rem); line-height: 1.25; margin: 8px 0 14px; }
.vplayer { position: relative; aspect-ratio: 16/9; background: #0a1d52; border-radius: 12px; overflow: hidden; margin: 8px 0 20px; }
.vplayer iframe, .vplayer button { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.vplayer button { padding: 0; cursor: pointer; background: #0a1d52 center/cover no-repeat; }
.vplayer .bigplay { position: absolute; left: 50%; top: 50%; transform: translate(-50%,-50%); width: 72px; height: 72px; border-radius: 50%; background: rgba(0,0,0,0.6); }
.vplayer .bigplay::after { content: ""; position: absolute; left: 29px; top: 21px; border-left: 22px solid #fff; border-top: 15px solid transparent; border-bottom: 15px solid transparent; }
.vcols { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 32px; align-items: start; }
@media (max-width: 860px) { .vcols { grid-template-columns: 1fr; } }
.vpage .vp-hook { font-size: 1.05rem; font-style: italic; line-height: 1.6; }
.vpage p { line-height: 1.7; }
.vchap { list-style: none; margin: 8px 0 0; padding: 0; border: 1.5px solid var(--line, #e2e8f0); border-radius: 12px; background: #fff; overflow: hidden; }
.vchap li { border-top: 1px solid var(--line, #e2e8f0); }
.vchap li:first-child { border-top: 0; }
.vchap button { display: flex; gap: 10px; width: 100%; text-align: left; font: inherit; font-size: 0.88rem; line-height: 1.4; padding: 9px 12px; background: none; border: 0; cursor: pointer; color: var(--ink, #14213D); }
.vchap button:hover { background: rgba(110,63,163,0.07); }
.vchap .ts { flex: none; font-family: var(--font-data, monospace); color: var(--violet, #6E3FA3); font-weight: 600; min-width: 2.8em; }
.vside { background: #fff; border: 1.5px solid var(--line, #e2e8f0); border-radius: 12px; padding: 16px; }
.vside h2 { font-size: 0.8rem; letter-spacing: 0.06em; text-transform: uppercase; font-family: var(--font-data, monospace); color: var(--graphite, #64748b); margin: 0 0 8px; }
.vside + .vside { margin-top: 16px; }
.vside ul { margin: 0; padding-left: 1.1rem; }
.vside li { margin: 6px 0; font-size: 0.9rem; }