.note-card[data-astro-cid-e6jgshqh]{background:var(--card);border:1px solid var(--border);border-radius:10px;flex-direction:column;transition:all .25s;display:flex;position:relative;overflow:hidden;text-decoration:none!important}.note-card[data-astro-cid-e6jgshqh]:hover{border-color:var(--accent);transform:translateY(-4px);box-shadow:0 3px 12px #00000012,0 1px 4px #00000012}.card-content[data-astro-cid-e6jgshqh]{padding:20px}.top-bar[data-astro-cid-e6jgshqh]{background:var(--accent);opacity:.7;width:100%;height:3px}.card-top[data-astro-cid-e6jgshqh]{justify-content:space-between;align-items:center;margin-bottom:12px;display:flex}.lecture-label[data-astro-cid-e6jgshqh]{text-transform:uppercase;letter-spacing:1px;color:var(--accent);background:var(--accent-soft);border-radius:4px;padding:2px 8px;font-size:10px;font-weight:800}.note-date[data-astro-cid-e6jgshqh]{color:var(--text-secondary);font-size:11px;font-weight:500}.note-title[data-astro-cid-e6jgshqh]{color:var(--text-primary);margin:0;font-size:1.15rem;font-weight:700;line-height:1.4}.note-desc[data-astro-cid-e6jgshqh]{color:var(--text-gray);-webkit-line-clamp:2;-webkit-box-orient:vertical;margin-top:10px;font-size:13px;display:-webkit-box;overflow:hidden}.video-section[data-astro-cid-mjkabsze]{margin-top:32px;margin-bottom:32px}.group-title[data-astro-cid-mjkabsze]{color:var(--text-primary);letter-spacing:-.01em;margin:0;padding-bottom:8px;font-size:1.1rem}.hr[data-astro-cid-mjkabsze]{border:0;border-top:1px solid var(--divider);margin-bottom:16px}.embed-grid[data-astro-cid-mjkabsze]{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;display:grid}.video-container[data-astro-cid-mjkabsze]{background:var(--card);border:1px solid var(--border);border-radius:12px;transition:border-color .2s,transform .2s;overflow:hidden}.video-container[data-astro-cid-mjkabsze]:hover{border-color:var(--accent);transform:translateY(-2px)}.video-wrapper[data-astro-cid-mjkabsze]{aspect-ratio:16/9;background:#000;width:100%;position:relative;overflow:hidden}.video-wrapper[data-astro-cid-mjkabsze] iframe[data-astro-cid-mjkabsze]{border:0;outline:none;width:100%;height:100%;display:block;position:absolute;inset:0}.thumbnail-overlay[data-astro-cid-mjkabsze]{z-index:2;cursor:pointer;background:#000;border:0;width:100%;height:100%;margin:0;padding:0;transition:opacity .25s,visibility .25s;position:absolute;inset:0}.thumbnail-overlay[data-astro-cid-mjkabsze].hidden{visibility:hidden;opacity:0;pointer-events:none}.video-thumbnail[data-astro-cid-mjkabsze]{object-fit:cover;width:100%;height:100%;display:block;position:absolute;inset:0}.custom-play-button[data-astro-cid-mjkabsze]{color:#fff;background:#000000bf;border:2px solid #ffffffe6;border-radius:50%;justify-content:center;align-items:center;width:64px;height:64px;transition:transform .2s,background .2s;display:flex;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.thumbnail-overlay[data-astro-cid-mjkabsze]:hover .custom-play-button[data-astro-cid-mjkabsze]{background:#000000e6;transform:translate(-50%,-50%)scale(1.08)}.play-icon[data-astro-cid-mjkabsze]{fill:currentColor;width:28px;height:28px;margin-left:3px}.video-meta[data-astro-cid-mjkabsze]{background:var(--card);padding:12px}.video-title[data-astro-cid-mjkabsze]{color:var(--text-primary);font-size:14px;font-weight:600;line-height:1.4;display:block}@media (width<=640px){.embed-grid[data-astro-cid-mjkabsze]{grid-template-columns:1fr}.custom-play-button[data-astro-cid-mjkabsze]{width:56px;height:56px}.play-icon[data-astro-cid-mjkabsze]{width:24px;height:24px}}.subject-title[data-astro-cid-pqhcbcdq]{letter-spacing:-.02em;font-size:32px;line-height:40px}.group-title[data-astro-cid-pqhcbcdq]{color:var(--text-primary);border-bottom:1px solid var(--divider);letter-spacing:-.01em;margin:32px 0 0;padding-bottom:8px;font-size:1.1rem;line-height:28px}.download-card[data-astro-cid-pqhcbcdq]{background:var(--card);border:1px solid var(--border);border-radius:8px;align-items:center;gap:15px;margin-bottom:8px;padding:12px 20px;transition:all .2s;display:flex;text-decoration:none!important}.download-card[data-astro-cid-pqhcbcdq]:hover{border-color:var(--accent);transform:translate(5px)}.hr[data-astro-cid-pqhcbcdq]{margin-bottom:16px}.text[data-astro-cid-pqhcbcdq]{flex-direction:column;flex:1;gap:8px;display:flex}.name[data-astro-cid-pqhcbcdq]{color:var(--text-primary);font-size:14px;font-weight:600}.sub[data-astro-cid-pqhcbcdq]{color:var(--text-secondary);font-size:12px}.dl-icon[data-astro-cid-pqhcbcdq]{opacity:.5;font-size:14px}.icon[data-astro-cid-pqhcbcdq]{font-size:1.5rem}.note-grid[data-astro-cid-pqhcbcdq]{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin-top:2rem;margin-bottom:4rem;display:grid}.lectures[data-astro-cid-pqhcbcdq]{letter-spacing:-.02em;margin:48px 0 16px;padding-top:24px;font-size:24px;line-height:32px}