@keyframes el-skeleton-loading-23841705{0%{background-position:100% 50%}to{background-position:0 50%}}.skeleton[data-v-23841705]{width:1200px;margin:0 auto;overflow:hidden;display:flex;flex-direction:column}.skeleton .title[data-v-23841705]{width:100px;height:28px;margin:0 auto;margin-top:50px;margin-bottom:30px}.skeleton .item[data-v-23841705],.skeleton .title[data-v-23841705]{background:linear-gradient(90deg,#f2f2f2 25%,#e6e6e6 37%,#f2f2f2 63%);background-size:400% 100%;animation:el-skeleton-loading-23841705 1.4s ease infinite}.skeleton .item[data-v-23841705]{width:300px;height:14px;margin:0 auto;margin-bottom:50px}.skeleton .btn-box[data-v-23841705]{width:104px;height:40px;margin:0 auto;background:linear-gradient(90deg,#f2f2f2 25%,#e6e6e6 37%,#f2f2f2 63%);background-size:400% 100%;animation:el-skeleton-loading-23841705 1.4s ease infinite}.page-wrapper[data-v-04f0c16c]{background-color:#fcfcfc;min-height:100vh;padding-bottom:40px}.main-container[data-v-04f0c16c]{width:100%;max-width:1080px;margin:0 auto;padding:30px 20px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif}.card-base[data-v-04f0c16c]{background:#fff;border-radius:12px;box-shadow:0 4px 20px rgba(0,0,0,.03);border:1px solid rgba(0,0,0,.04);overflow:hidden;margin-bottom:24px}.course-header[data-v-04f0c16c]{display:flex;padding:24px;gap:30px}.cover-box[data-v-04f0c16c]{width:320px;height:200px;flex-shrink:0;border-radius:8px;overflow:hidden;position:relative;background:#eef2f7}.course-cover[data-v-04f0c16c]{width:100%;height:100%;-o-object-fit:cover;object-fit:cover;transition:transform .5s}.cover-box:hover .course-cover[data-v-04f0c16c]{transform:scale(1.05)}.info-box[data-v-04f0c16c]{flex:1;display:flex;flex-direction:column}.info-top[data-v-04f0c16c]{display:flex;align-items:center;margin-bottom:12px}.category-badge[data-v-04f0c16c]{background:#eef4ff;color:#3b82f6;padding:4px 10px;border-radius:6px;font-size:13px;font-weight:600;margin-right:12px}.course-title[data-v-04f0c16c]{font-size:24px;font-weight:700;color:#1f2937;margin:0;line-height:1.3}.course-desc[data-v-04f0c16c]{font-size:15px;color:#6b7280;line-height:1.6;margin-bottom:auto;display:-webkit-box;line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.info-footer[data-v-04f0c16c]{border-top:1px solid #f3f4f6;padding-top:15px;margin-top:15px}.stat-group[data-v-04f0c16c]{font-size:13px;color:#9ca3af}.stat-value[data-v-04f0c16c]{color:#4b5563;font-weight:500;margin-left:8px}.section-header[data-v-04f0c16c]{display:flex;align-items:baseline;margin-bottom:20px;padding-left:4px}.section-title[data-v-04f0c16c]{font-size:20px;font-weight:700;color:#111827;margin:0 12px 0 0}.section-subtitle[data-v-04f0c16c]{font-size:14px;color:#9ca3af}.chapter-card[data-v-04f0c16c]{transition:box-shadow .3s}.chapter-card[data-v-04f0c16c]:hover{box-shadow:0 8px 25px rgba(0,0,0,.06)}.chapter-header[data-v-04f0c16c]{padding:18px 24px;background:#fff;cursor:pointer;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid transparent;transition:background .2s}.chapter-header[data-v-04f0c16c]:hover{background:#f9fafb}.chapter-header.is-open[data-v-04f0c16c]{border-bottom:1px solid #f3f4f6}.header-left[data-v-04f0c16c]{display:flex;align-items:center}.chapter-idx[data-v-04f0c16c]{font-size:24px;font-weight:900;color:#e5e7eb;margin-right:16px;font-family:Arial,sans-serif}.chapter-title[data-v-04f0c16c]{font-size:16px;font-weight:600;color:#374151}.header-right[data-v-04f0c16c]{display:flex;align-items:center;color:#9ca3af;font-size:13px}.toggle-icon[data-v-04f0c16c]{margin-left:10px;transition:transform .3s ease;display:flex;align-items:center}.toggle-icon.rotated[data-v-04f0c16c]{transform:rotate(180deg)}.chapter-body[data-v-04f0c16c]{padding:20px 24px 30px;background:#fff}.lesson-row[data-v-04f0c16c]{display:flex;position:relative;padding-bottom:24px}.lesson-row[data-v-04f0c16c]:last-child{padding-bottom:0}.timeline-left[data-v-04f0c16c]{display:flex;flex-direction:column;align-items:center;margin-right:20px;width:32px;flex-shrink:0;position:relative}.timeline-line[data-v-04f0c16c]{position:absolute;top:32px;bottom:-24px;left:50%;transform:translateX(-50%);width:2px;background-color:#f3f4f6;z-index:1}.type-icon-wrapper[data-v-04f0c16c]{width:32px;height:32px;border-radius:50%;background:#fff;border:2px solid #e5e7eb;display:flex;align-items:center;justify-content:center;z-index:2;color:#9ca3af;transition:all .3s}.type-icon-wrapper.video[data-v-04f0c16c]{border-color:#bfdbfe;color:#3b82f6;background:#eff6ff}.type-icon-wrapper.code[data-v-04f0c16c]{border-color:#fde68a;color:#d97706;background:#fffbeb}.type-icon-wrapper.question[data-v-04f0c16c]{border-color:#bbf7d0;color:#16a34a;background:#f0fdf4}.lesson-card[data-v-04f0c16c]{flex:1;background:#fff;border:1px solid #f3f4f6;border-radius:10px;padding:14px 20px;display:flex;justify-content:space-between;align-items:center;transition:all .3s cubic-bezier(.4,0,.2,1);position:relative}.lesson-card.is-clickable[data-v-04f0c16c]{cursor:pointer}.lesson-card.is-clickable[data-v-04f0c16c]:hover{border-color:#dbeafe;background:#f8fafc;transform:translateY(-2px);box-shadow:0 4px 12px rgba(59,130,246,.1)}.lesson-card.is-clickable:hover .lesson-title[data-v-04f0c16c]{color:#2563eb}.lesson-card.is-locked[data-v-04f0c16c]{background:#f9fafb;border-color:#f3f4f6;cursor:not-allowed;opacity:.8}.lesson-card.is-locked .lesson-title[data-v-04f0c16c]{color:#9ca3af}.card-main[data-v-04f0c16c]{flex:1;min-width:0;margin-right:20px}.title-row[data-v-04f0c16c]{display:flex;align-items:center;margin-bottom:6px}.lesson-title[data-v-04f0c16c]{font-size:15px;font-weight:500;color:#374151;margin-right:10px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;transition:color .2s}.tag-pill[data-v-04f0c16c]{font-size:11px;padding:1px 6px;border-radius:4px;border:1px solid transparent;white-space:nowrap}.tag-pill.video[data-v-04f0c16c]{color:#3b82f6;background:#eff6ff;border-color:#dbeafe}.tag-pill.code[data-v-04f0c16c]{color:#d97706;background:#fffbeb;border-color:#fef3c7}.tag-pill.question[data-v-04f0c16c]{color:#16a34a;background:#f0fdf4;border-color:#dcfce7}.meta-row[data-v-04f0c16c]{display:flex;align-items:center;font-size:12px;color:#9ca3af}.meta-item[data-v-04f0c16c]{display:flex;align-items:center;margin-right:16px}.meta-icon[data-v-04f0c16c]{margin-right:4px}.card-action[data-v-04f0c16c]{flex-shrink:0}.status-lock[data-v-04f0c16c]{color:#d1d5db}.action-btn[data-v-04f0c16c]{display:flex;align-items:center;gap:8px}.btn-text[data-v-04f0c16c]{font-size:12px;font-weight:600;color:#3b82f6;opacity:0;transform:translateX(10px);transition:all .3s}.btn-circle[data-v-04f0c16c]{width:32px;height:32px;border-radius:50%;background:#fff;border:1px solid #e5e7eb;display:flex;align-items:center;justify-content:center;color:#3b82f6;transition:all .3s}.lesson-card.is-clickable:hover .btn-text[data-v-04f0c16c]{opacity:1;transform:translateX(0)}.lesson-card.is-clickable:hover .btn-circle[data-v-04f0c16c]{background:#3b82f6;border-color:#3b82f6;color:#fff;transform:scale(1.1);box-shadow:0 2px 8px rgba(59,130,246,.4)}.empty-chapter[data-v-04f0c16c]{color:#9ca3af;font-size:13px;padding-left:52px;font-style:italic}