.video-scope{--vc-card:var(--surface-card);--vc-line:var(--line);--vc-line-strong:var(--line-strong);--vc-ink:var(--ink);--vc-ink-2:var(--ink-soft);--vc-ink-3:var(--ink-muted);--vc-accent:var(--accent);--vc-accent-soft:var(--accent-soft);color:var(--vc-ink);font-family:var(--font-sans)}.vc-head{border-bottom:1px solid var(--vc-line);justify-content:space-between;align-items:flex-end;gap:28px;padding:8px 0 22px;display:flex}.vc-head h1{font-family:var(--font-serif);letter-spacing:.01em;margin:0;font-size:38px;font-weight:700;line-height:1.2}.vc-head p{color:var(--vc-ink-2);max-width:560px;margin:9px 0 0;font-size:13.5px;line-height:1.7}.vc-head .vc-count{color:var(--vc-ink-3);text-align:right;flex:none;font-size:11.5px;line-height:1.8}.vc-chips{flex-wrap:wrap;align-items:center;gap:8px;padding:16px 0 4px;display:flex}.vc-chip{border:1px solid var(--vc-line-strong);height:28px;color:var(--vc-ink-2);border-radius:999px;align-items:center;padding:0 13px;font-size:12px;text-decoration:none;transition:all .15s;display:inline-flex}.vc-chip:hover{border-color:var(--vc-ink-3);color:var(--vc-ink)}.vc-chip[data-on=true]{color:var(--accent-contrast);background:var(--vc-accent);border-color:var(--vc-accent)}.vc-block{padding-top:34px}.vc-block-head{align-items:baseline;gap:12px;padding-bottom:14px;display:flex}.vc-block-head h2{font-family:var(--font-serif);margin:0;font-size:21px;font-weight:700}.vc-block-head .vc-sub{color:var(--vc-ink-3);font-size:11.5px}.vc-block-head .vc-more{color:var(--vc-ink-3);margin-left:auto;font-size:12px;text-decoration:none}.vc-block-head .vc-more:hover{color:var(--vc-accent)}.vc-feature{grid-template-columns:minmax(0,1.62fr) minmax(0,1fr);align-items:start;gap:22px;padding-top:26px;display:grid}.vc-feature-main{border:1px solid var(--vc-line);background:var(--vc-card);color:inherit;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);text-decoration:none;transition:all .2s;display:grid;overflow:hidden}.vc-feature-main:hover{border-color:var(--vc-line-strong);box-shadow:var(--shadow-card)}.vc-feature-main .vc-thumb{aspect-ratio:4/3;height:auto}.vc-feature-body{flex-direction:column;justify-content:flex-start;padding:24px 22px 20px;display:flex}.vc-series-line{color:var(--vc-accent);align-items:center;gap:7px;margin-bottom:10px;font-size:11px;display:flex}.vc-series-line:before{content:"";background:var(--vc-accent);width:14px;height:1px}.vc-feature-body h3{font-family:var(--font-serif);margin:0 0 10px;font-size:23px;font-weight:700;line-height:1.42}.vc-feature-body .vc-excerpt{color:var(--vc-ink-2);margin:0 0 16px;font-size:12.5px;line-height:1.75;display:block}.vc-feature[data-single=true]{grid-template-columns:1fr}.vc-feature[data-single=true] .vc-feature-main{grid-template-columns:minmax(0,1.1fr) minmax(0,1fr)}.vc-feature-side{grid-template-rows:auto auto;gap:14px;display:grid}.vc-mini{border:1px solid var(--vc-line);background:var(--vc-card);color:inherit;grid-template-columns:132px minmax(0,1fr);gap:12px;padding:10px;text-decoration:none;transition:all .2s;display:grid}.vc-mini:hover{border-color:var(--vc-line-strong);box-shadow:var(--shadow-card)}.vc-mini .vc-thumb{height:112px}.vc-mini-body{flex-direction:column;justify-content:center;min-width:0;display:flex}.vc-mini-body h4{font-family:var(--font-serif);margin:0 0 6px;font-size:14.5px;font-weight:700;line-height:1.5}.vc-thumb{background:var(--surface-cover);display:block;position:relative;overflow:hidden}.vc-thumb img{object-fit:cover;width:100%;height:100%;transition:transform .45s}.vc-card:hover .vc-thumb img,.vc-feature-main:hover .vc-thumb img,.vc-mini:hover .vc-thumb img,.vc-row:hover .vc-thumb img{transform:scale(1.035)}.vc-thumb:after{content:"";pointer-events:none;background:linear-gradient(#0000 55%,#00000052 100%);position:absolute;inset:0}.vc-dur{z-index:2;color:#fff;font-family:var(--font-sans);font-variant-numeric:tabular-nums;background:#121211c2;border-radius:2px;padding:2px 6px;font-size:10.5px;position:absolute;bottom:7px;right:7px}.vc-badge{z-index:2;color:#191919;background:#faf9f6f0;border-radius:2px;padding:3px 7px;font-size:10px;font-weight:600;position:absolute;top:8px;left:8px}.vc-badge[data-accent=true]{background:var(--vc-accent);color:var(--accent-contrast)}.vc-progress{z-index:3;background:#ffffff3d;height:3px;position:absolute;bottom:0;left:0;right:0}.vc-progress i{background:var(--vc-accent);height:100%;display:block}.vc-rail{gap:14px;padding-bottom:6px;display:flex;overflow-x:auto}.vc-rail::-webkit-scrollbar{height:5px}.vc-rail::-webkit-scrollbar-thumb{background:var(--line-strong);border-radius:99px}.vc-short{color:inherit;flex:0 0 170px;text-decoration:none}.vc-short .vc-thumb{aspect-ratio:9/16}.vc-short b{margin:9px 0 4px;font-size:12.5px;font-weight:600;line-height:1.55;display:block}.vc-short:hover b{color:var(--vc-accent)}.vc-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:22px 20px;display:grid}.vc-card{min-width:0;color:inherit;text-decoration:none;display:block}.vc-card .vc-thumb{aspect-ratio:16/9}.vc-card h4{font-family:var(--font-serif);margin:10px 0 6px;font-size:14.5px;font-weight:700;line-height:1.55}.vc-card:hover h4{color:var(--vc-accent)}.vc-meta{color:var(--vc-ink-3);align-items:center;gap:6px;font-size:11px;display:flex}.vc-rows{border-top:1px solid var(--vc-line)}.vc-row{border-bottom:1px solid var(--vc-line);color:inherit;grid-template-columns:186px minmax(0,1fr) auto;align-items:center;gap:18px;padding:16px 0;text-decoration:none;display:grid}.vc-row .vc-thumb{aspect-ratio:16/9}.vc-row h4{font-family:var(--font-serif);margin:0 0 5px;font-size:16px;font-weight:700;line-height:1.5}.vc-row:hover h4{color:var(--vc-accent)}.vc-row p{color:var(--vc-ink-2);margin:0 0 7px;font-size:12px;line-height:1.6}.vc-tag{border:1px solid var(--vc-line-strong);color:var(--vc-ink-2);border-radius:2px;padding:2px 7px;font-size:10px;display:inline-block}.vc-tag[data-solid=true]{background:var(--vc-ink);border-color:var(--vc-ink);color:var(--surface-canvas)}.vc-btn-ghost{border:1px solid var(--vc-line-strong);height:32px;color:var(--vc-ink);white-space:nowrap;background:0 0;border-radius:999px;align-items:center;padding:0 15px;font-size:12px;display:inline-flex}.vc-empty{text-align:center;color:var(--vc-ink-3);padding:56px 0;font-size:13px}.vc-detail{grid-template-columns:minmax(0,1fr) 312px;align-items:start;gap:42px;padding-top:22px;display:grid}.vc-player{aspect-ratio:16/9;background:#111110;border-radius:3px;position:relative;overflow:hidden}.vc-player video{object-fit:contain;background:#111110;width:100%;height:100%}.vc-player-poster{object-fit:cover;width:100%;height:100%;position:absolute;inset:0}.vc-player-cta{place-items:center;display:grid;position:absolute;inset:0}.vc-play-btn{color:#191919;cursor:pointer;background:#faf9f6f0;border:0;border-radius:50%;place-items:center;width:64px;height:64px;display:grid;box-shadow:0 6px 26px #00000047}.vc-play-btn svg{fill:currentColor;width:20px;height:20px;margin-left:3px}.vc-player-bar{color:#fff;background:linear-gradient(#0000,#0000009e);padding:0 14px 11px;position:absolute;bottom:0;left:0;right:0}.vc-scrub{cursor:pointer;align-items:center;height:16px;display:flex;position:relative}.vc-scrub .bar{background:#ffffff42;border-radius:2px;width:100%;height:3px;position:relative}.vc-scrub .bar i{background:var(--vc-accent);border-radius:2px;height:100%;display:block}.vc-scrub .bar b{background:#fff;border-radius:50%;width:9px;height:9px;margin:-4.5px 0 0 -4.5px;position:absolute;top:50%}.vc-ctrl{align-items:center;gap:10px;margin-top:6px;font-size:11.5px;display:flex}.vc-ctrl button{color:#ffffffdb;cursor:pointer;background:0 0;border:0;border-radius:3px;padding:2px 6px;font-size:11.5px}.vc-ctrl button:hover{color:#fff;background:#ffffff24}.vc-ctrl .vc-time{font-variant-numeric:tabular-nums;color:#ffffffdb}.vc-ctrl .vc-spacer{margin-left:auto}.vc-detail-head{padding-top:22px}.vc-crumb{color:var(--vc-ink-3);flex-wrap:wrap;align-items:center;gap:7px;margin-bottom:14px;font-size:11.5px;display:flex}.vc-crumb a{color:inherit;text-decoration:none}.vc-crumb a:hover{color:var(--vc-accent)}.vc-detail-head h1{font-family:var(--font-serif);margin:0 0 12px;font-size:30px;font-weight:700;line-height:1.42}.vc-detail-meta{color:var(--vc-ink-3);flex-wrap:wrap;align-items:center;gap:8px;font-size:12px;display:flex}.vc-detail-meta b{color:var(--vc-ink-2);font-weight:600}.vc-actions{border-top:1px solid var(--vc-line);border-bottom:1px solid var(--vc-line);flex-wrap:wrap;align-items:center;gap:8px;margin-top:18px;padding:14px 0;display:flex}.vc-pill{border:1px solid var(--vc-line-strong);height:32px;color:var(--vc-ink-2);cursor:pointer;background:0 0;border-radius:999px;align-items:center;gap:6px;padding:0 14px;font-size:12px;display:inline-flex}.vc-pill:hover{border-color:var(--vc-ink-3);color:var(--vc-ink)}.vc-pill[data-on=true]{color:var(--vc-accent);border-color:var(--vc-accent);background:var(--vc-accent-soft)}.vc-actions .vc-actions-right{margin-left:auto}.vc-answers{background:var(--surface-sunken);border-left:2px solid var(--vc-accent);margin-top:22px;padding:16px 18px}.vc-answers .t{letter-spacing:.06em;color:var(--vc-accent);margin-bottom:9px;font-size:11px;font-weight:700}.vc-answers button{width:100%;color:var(--vc-ink);text-align:left;cursor:pointer;background:0 0;border:0;align-items:baseline;gap:10px;padding:4px 0;font-size:13px;display:flex}.vc-answers button:hover{color:var(--vc-accent)}.vc-answers .ts{color:var(--vc-ink-3);font-variant-numeric:tabular-nums;flex:none;margin-left:auto;font-size:10.5px}.vc-section{padding-top:30px}.vc-section-head{align-items:baseline;gap:10px;margin-bottom:12px;display:flex}.vc-section-head h2{font-family:var(--font-serif);margin:0;font-size:18px;font-weight:700}.vc-section-head .sub{color:var(--vc-ink-3);font-size:11px}.vc-chapters{border-top:1px solid var(--vc-line)}.vc-chapter{border:0;border-bottom:1px solid var(--vc-line);text-align:left;cursor:pointer;background:0 0;border-left:2px solid #0000;align-items:center;gap:14px;width:100%;padding:11px 10px 11px 0;transition:all .15s;display:flex}.vc-chapter:hover{background:var(--surface-hover);padding-left:8px}.vc-chapter[data-on=true]{border-left-color:var(--vc-accent);background:var(--vc-accent-soft);padding-left:8px}.vc-chapter .t{width:48px;color:var(--vc-ink-3);font-variant-numeric:tabular-nums;flex:none;font-size:11px}.vc-chapter[data-on=true] .t{color:var(--vc-accent)}.vc-chapter .tt{flex:1;min-width:0;font-size:13px;line-height:1.6}.vc-chapter[data-on=true] .tt{font-weight:600}.vc-discuss-head{border-bottom:1px solid var(--vc-line);align-items:center;gap:10px;padding-bottom:12px;display:flex}.vc-discuss-head h2{font-family:var(--font-serif);margin:0;font-size:18px;font-weight:700}.vc-editor{border:1px solid var(--vc-line);background:var(--vc-card);margin-top:14px;padding:12px 14px}.vc-editor textarea{resize:vertical;width:100%;min-height:56px;font-family:var(--font-sans);color:var(--vc-ink);background:0 0;border:0;outline:0;font-size:13px}.vc-editor-foot{justify-content:flex-end;align-items:center;gap:10px;margin-top:6px;display:flex}.vc-editor-foot .hint{color:var(--vc-ink-3);margin-right:auto;font-size:11px}.vc-submit{background:var(--vc-accent);height:30px;color:var(--accent-contrast);cursor:pointer;border:0;border-radius:999px;padding:0 16px;font-size:12px;font-weight:600}.vc-submit:disabled{opacity:.5;cursor:not-allowed}.vc-cmt{border-bottom:1px solid var(--vc-line);gap:12px;padding:16px 0;display:flex}.vc-cmt .avatar{background:var(--surface-sunken);width:34px;height:34px;color:var(--vc-ink-2);border-radius:50%;flex:none;place-items:center;font-size:12px;font-weight:700;display:grid;overflow:hidden}.vc-cmt .avatar img{object-fit:cover;width:100%;height:100%}.vc-cmt-body{flex:1;min-width:0}.vc-cmt-head{flex-wrap:wrap;align-items:baseline;gap:8px;margin-bottom:4px;display:flex}.vc-cmt-head .nm{font-size:12.5px;font-weight:700}.vc-cmt-head .tm{color:var(--vc-ink-3);font-size:11px}.vc-cmt-text{color:var(--ink);word-break:break-word;margin:0 0 7px;font-size:13px;line-height:1.75}.vc-cmt-acts{color:var(--vc-ink-3);gap:14px;font-size:11.5px;display:flex}.vc-cmt-acts button{color:inherit;font-size:inherit;cursor:pointer;background:0 0;border:0}.vc-cmt-acts button:hover{color:var(--vc-accent)}.vc-reply{background:var(--surface-sunken);border-left:2px solid var(--vc-line-strong);margin-top:10px;padding:10px 12px}.vc-side-card{border:1px solid var(--vc-line);background:var(--vc-card);padding:16px}.vc-side-card+.vc-side-card{margin-top:14px}.vc-side-card .k{letter-spacing:.06em;color:var(--vc-ink-3);margin-bottom:9px;font-size:10.5px}.vc-side-card h3{font-family:var(--font-serif);margin:0 0 8px;font-size:15.5px;font-weight:700;line-height:1.5}.vc-side-card .desc{color:var(--vc-ink-2);margin:0 0 12px;font-size:11.5px;line-height:1.7}.vc-course-cover{aspect-ratio:16/9;background:var(--surface-cover);margin-bottom:12px;overflow:hidden}.vc-course-cover img{object-fit:cover;width:100%;height:100%}.vc-course-facts{border-top:1px solid var(--vc-line);border-bottom:1px solid var(--vc-line);color:var(--vc-ink-3);gap:14px;margin-bottom:12px;padding:9px 0;font-size:11px;display:flex}.vc-buy{background:var(--vc-accent);width:100%;height:36px;color:var(--accent-contrast);border-radius:999px;justify-content:center;align-items:center;gap:6px;font-size:12.5px;font-weight:600;text-decoration:none;display:flex}.vc-buy:hover{filter:brightness(1.05)}.vc-buy-note{color:var(--vc-ink-3);text-align:center;margin-top:8px;font-size:10.5px;line-height:1.6}.vc-ep{border-bottom:1px dashed var(--vc-line);color:var(--vc-ink-2);align-items:center;gap:9px;padding:7px 0;font-size:12px;text-decoration:none;display:flex}.vc-ep:last-child{border-bottom:0}.vc-ep .no{width:18px;color:var(--vc-ink-3);font-variant-numeric:tabular-nums;flex:none;font-size:10px}.vc-ep .tt{text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0;overflow:hidden}.vc-ep[data-on=true]{color:var(--vc-ink);font-weight:600}.vc-ep[data-on=true] .no{color:var(--vc-accent)}.vc-file{border-bottom:1px dashed var(--vc-line);color:var(--vc-ink-2);align-items:center;gap:9px;padding:8px 0;font-size:12px;text-decoration:none;display:flex}.vc-file:last-child{border-bottom:0}.vc-file:hover{color:var(--vc-accent)}.vc-file .ft{border:1px solid var(--vc-line-strong);width:26px;height:26px;color:var(--vc-ink-3);border-radius:2px;flex:none;place-items:center;font-size:9px;display:grid}.vc-teacher{align-items:center;gap:10px;display:flex}.vc-teacher .avatar{background:var(--surface-sunken);width:40px;height:40px;color:var(--vc-ink-2);border-radius:50%;flex:none;place-items:center;font-size:14px;font-weight:700;display:grid;overflow:hidden}.vc-teacher .avatar img{object-fit:cover;width:100%;height:100%}.vc-teacher .tname{font-size:13px;font-weight:700}.vc-teacher .tmeta{color:var(--vc-ink-3);margin-top:2px;font-size:10.5px}.vc-locked{aspect-ratio:16/9;background:var(--surface-sunken);color:var(--vc-ink-2);text-align:center;place-items:center;gap:10px;font-size:13px;display:grid}.vc-locked a{color:var(--vc-accent)}@media (max-width:900px){.vc-head{display:block}.vc-head .vc-count{display:none}.vc-feature,.vc-feature-main{grid-template-columns:1fr}.vc-feature-main .vc-thumb{aspect-ratio:16/10}.vc-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px 12px}.vc-row{grid-template-columns:104px minmax(0,1fr);gap:12px}.vc-row .vc-btn-ghost{display:none}.vc-detail{grid-template-columns:1fr;gap:26px}.vc-detail-head h1{font-size:21px}.vc-short{flex:0 0 140px}.vc-card h4{font-size:12.5px}}