.bldr-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:28px;gap:16px;flex-wrap:wrap}.bldr-head__left{display:flex;align-items:center;gap:14px}.bldr-head__icon{width:48px;height:48px;border-radius:var(--radius-lg);background:var(--color-primary-light);color:var(--color-primary);display:flex;align-items:center;justify-content:center;font-size:1.3rem;flex-shrink:0}.bldr-head__title{font-size:1.4rem;font-weight:800;color:var(--color-dark);letter-spacing:-.03em}.bldr-head__sub{font-size:var(--font-size-sm);color:var(--color-muted);margin-top:2px}.bldr-head__sub a{color:var(--color-primary);font-weight:600;text-decoration:none}.bldr-head__sub a:hover{text-decoration:underline}.bldr-head__actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.bldr-layout{display:grid;grid-template-columns:1fr 300px;gap:24px;align-items:start}.bldr-main{background:#fff;border-radius:var(--radius-xl);border:1px solid var(--color-border);box-shadow:var(--shadow-sm);overflow:hidden}.bldr-toolbar{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;border-bottom:1px solid var(--color-border);background:var(--color-light)}.bldr-toolbar__left{display:flex;align-items:center;gap:10px}.bldr-toolbar__left i{color:var(--color-primary);font-size:.9rem}.bldr-toolbar__left strong{font-size:var(--font-size-sm);font-weight:700;color:var(--color-dark)}.bldr-count{font-size:var(--font-size-xs);color:var(--color-muted);background:var(--color-border);padding:2px 8px;border-radius:10px}.bldr-sections{padding:16px;display:flex;flex-direction:column;gap:12px}.bldr-section{border:1.5px solid var(--color-border);border-radius:var(--radius-lg);overflow:hidden;transition:box-shadow .2s}.bldr-section:hover{box-shadow:0 2px 8px #0000000f}.bldr-section__head{display:flex;align-items:center;justify-content:space-between;padding:13px 16px;background:var(--color-light);cursor:pointer;gap:12px;transition:background .15s}.bldr-section__head:hover{background:#f0f0f0}.bldr-section__left{display:flex;align-items:center;gap:10px;flex:1;min-width:0}.bldr-section__right{display:flex;align-items:center;gap:4px;flex-shrink:0}.bldr-drag{color:#d1d5db;cursor:grab;font-size:.82rem;flex-shrink:0}.bldr-drag:hover{color:#9ca3af}.bldr-section__num{width:24px;height:24px;border-radius:6px;background:var(--color-primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:.7rem;font-weight:800;flex-shrink:0}.bldr-chevron{color:var(--color-muted);font-size:.72rem;flex-shrink:0;transition:transform .22s}.bldr-chevron.closed{transform:rotate(-90deg)}.bldr-section__name{font-size:var(--font-size-sm);font-weight:700;color:var(--color-dark);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.bldr-section__pill{font-size:var(--font-size-xs);color:var(--color-muted);background:#e9ecef;padding:2px 8px;border-radius:10px;flex-shrink:0;white-space:nowrap}.bldr-ibtn{width:30px;height:30px;border-radius:var(--radius-sm);background:none;border:1px solid transparent;color:var(--color-muted);display:flex;align-items:center;justify-content:center;font-size:.78rem;cursor:pointer;transition:all .15s;flex-shrink:0}.bldr-ibtn:hover{background:#fff;border-color:var(--color-border);color:var(--color-dark);box-shadow:0 1px 3px #0000000f}.bldr-ibtn--add:hover{background:var(--color-primary-light);border-color:var(--color-primary);color:var(--color-primary)}.bldr-ibtn--del:hover{background:#fee2e2;border-color:#fca5a5;color:var(--color-danger)}.bldr-topics{border-top:1.5px solid var(--color-border)}.bldr-topics.hidden{display:none}.bldr-topic{display:flex;align-items:center;justify-content:space-between;padding:11px 16px 11px 20px;border-bottom:1px solid var(--color-border);gap:12px;background:#fff;transition:background .12s}.bldr-topic:last-child{border-bottom:none}.bldr-topic:hover{background:#fafbfc}.bldr-topic__left{display:flex;align-items:center;gap:9px;flex:1;min-width:0}.bldr-topic__right{display:flex;align-items:center;gap:6px;flex-shrink:0}.bldr-topic__name{font-size:var(--font-size-sm);color:var(--color-dark);font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.type-dot{width:28px;height:28px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:.72rem;flex-shrink:0}.type-dot--video{background:#dcfce7;color:#16a34a}.type-dot--text{background:#e0f2fe;color:#0284c7}.type-dot--quiz{background:#fef3c7;color:#d97706}.type-dot--assignment{background:#ede9fe;color:#7c3aed}.bldr-free-tag{font-size:.6rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;background:var(--color-primary-light);color:var(--color-primary);padding:2px 7px;border-radius:10px;flex-shrink:0;display:flex;align-items:center;gap:3px}.bldr-dur{font-size:var(--font-size-xs);color:var(--color-muted);display:flex;align-items:center;gap:4px}.bldr-badge{font-size:.62rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;padding:3px 8px;border-radius:10px}.bldr-badge--video{background:#dcfce7;color:#16a34a}.bldr-badge--text{background:#e0f2fe;color:#0284c7}.bldr-badge--quiz{background:#fef3c7;color:#d97706}.bldr-badge--assignment{background:#ede9fe;color:#7c3aed}.bldr-no-topics{padding:14px 20px;font-size:var(--font-size-xs);color:var(--color-muted);display:flex;align-items:center;gap:8px;background:#fafafa}.bldr-link{background:none;border:none;font-family:var(--font-family);font-size:var(--font-size-xs);color:var(--color-primary);font-weight:600;cursor:pointer;text-decoration:underline;padding:0}.bldr-empty{text-align:center;padding:56px 24px;display:flex;flex-direction:column;align-items:center;gap:12px}.bldr-empty__ico{width:72px;height:72px;border-radius:50%;background:var(--color-primary-light);color:var(--color-primary);display:flex;align-items:center;justify-content:center;font-size:1.8rem;margin-bottom:4px}.bldr-empty h3{font-size:1rem;font-weight:700;color:var(--color-dark)}.bldr-empty p{font-size:var(--font-size-sm);color:var(--color-muted);max-width:320px;line-height:1.6}.bldr-sidebar{display:flex;flex-direction:column;gap:16px}.bldr-scard{background:#fff;border-radius:var(--radius-xl);border:1px solid var(--color-border);overflow:hidden}.bldr-scard__head{display:flex;align-items:center;gap:8px;padding:14px 18px;border-bottom:1px solid var(--color-border);background:var(--color-light);font-size:var(--font-size-sm);font-weight:700;color:var(--color-dark)}.bldr-scard__head i{color:var(--color-primary);font-size:.9rem}.bldr-stats{padding:8px 0}.bldr-stat{display:flex;align-items:center;justify-content:space-between;padding:10px 18px;border-bottom:1px solid #f3f4f6;font-size:var(--font-size-sm)}.bldr-stat:last-child{border-bottom:none}.bldr-stat__label{display:flex;align-items:center;gap:7px;color:var(--color-muted)}.bldr-stat__label i{font-size:.78rem;width:12px;text-align:center}.bldr-stat__val{font-weight:700;color:var(--color-dark)}.bldr-status{display:flex;align-items:center;gap:5px;font-size:var(--font-size-xs);font-weight:700;padding:4px 10px;border-radius:20px}.bldr-status--pub{background:#dcfce7;color:#16a34a}.bldr-status--draft{background:#fef3c7;color:#d97706}.bldr-thumb img{width:100%;height:160px;object-fit:cover;display:block}.bldr-thumb{position:relative}.bldr-thumb__change{position:absolute;bottom:10px;right:10px;background:#000000a6;color:#fff;font-size:var(--font-size-xs);font-weight:600;padding:5px 10px;border-radius:var(--radius-sm);text-decoration:none;display:flex;align-items:center;gap:5px;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);transition:background .15s}.bldr-thumb__change:hover{background:#000000d9}.bldr-no-thumb{padding:28px 18px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:10px}.bldr-no-thumb i{font-size:2rem;color:#d1d5db}.bldr-no-thumb p{font-size:var(--font-size-xs);color:var(--color-muted)}.bldr-scard--tips .bldr-scard__head{background:#fffbeb;border-bottom-color:#fde68a}.bldr-scard--tips .bldr-scard__head i{color:#d97706}.bldr-tips{padding:12px 18px;list-style:none;display:flex;flex-direction:column;gap:10px}.bldr-tips li{display:flex;align-items:flex-start;gap:8px;font-size:var(--font-size-xs);color:var(--color-body);line-height:1.5}.bldr-tips li i{color:var(--color-primary);margin-top:1px;flex-shrink:0;font-size:.7rem}.bldr-modal-overlay{position:fixed;inset:0;background:#00000073;z-index:1000;display:none;align-items:center;justify-content:center;padding:16px;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.bldr-modal-overlay.open{display:flex}.bldr-modal{background:#fff;border-radius:var(--radius-xl);width:100%;max-width:460px;box-shadow:0 24px 60px #00000026;animation:bldrModalIn .22s cubic-bezier(.22,1,.36,1);overflow:hidden}.bldr-modal--lg{max-width:580px}@keyframes bldrModalIn{0%{opacity:0;transform:scale(.95) translateY(8px)}to{opacity:1;transform:scale(1) translateY(0)}}.bldr-modal__head{display:flex;align-items:center;justify-content:space-between;padding:18px 22px;border-bottom:1px solid var(--color-border);background:var(--color-light)}.bldr-modal__head h3{font-size:1rem;font-weight:700;color:var(--color-dark)}.bldr-modal__x{width:30px;height:30px;border-radius:50%;background:var(--color-border);color:var(--color-dark);border:none;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:.8rem;transition:background .15s}.bldr-modal__x:hover{background:#d1d5db}.bldr-modal__body{padding:22px;display:flex;flex-direction:column;gap:16px}.bldr-modal__foot{display:flex;justify-content:flex-end;gap:10px;padding:16px 22px;border-top:1px solid var(--color-border);background:var(--color-light)}.bldr-mfield{display:flex;flex-direction:column;gap:5px}.bldr-mfield label{font-size:var(--font-size-xs);font-weight:700;color:var(--color-dark);text-transform:uppercase;letter-spacing:.04em}.bldr-mrow{display:grid;grid-template-columns:1fr 1fr;gap:14px}.bldr-mfield--toggle{justify-content:flex-end}.bldr-minput{position:relative;display:flex;align-items:center}.bldr-minput i{position:absolute;left:13px;color:var(--color-muted);font-size:.82rem;pointer-events:none}.bldr-minput input,.bldr-mselect select,.bldr-modal__body textarea{width:100%;padding:.7rem .9rem .7rem 2.5rem;border:1.5px solid var(--color-border);border-radius:var(--radius-md);font-family:var(--font-family);font-size:var(--font-size-sm);color:var(--color-dark);background:#fff;outline:none;transition:border-color .18s,box-shadow .18s}.bldr-minput input:focus,.bldr-mselect select:focus,.bldr-modal__body textarea:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px #0ea3711a}.bldr-modal__body textarea{padding:.7rem .9rem;resize:vertical}.bldr-mselect{position:relative;display:flex;align-items:center}.bldr-mselect i{position:absolute;left:13px;color:var(--color-muted);font-size:.82rem;pointer-events:none;z-index:1}.bldr-mselect select{padding-left:2.5rem;appearance:none;cursor:pointer}.bldr-mselect:after{content:"";font-family:"Font Awesome 6 Free";font-weight:900;position:absolute;right:13px;font-size:.7rem;color:var(--color-muted);pointer-events:none}.bldr-toggle-wrap{display:flex;align-items:center;gap:10px;cursor:pointer;padding-top:6px}.bldr-toggle-wrap input[type=checkbox]{display:none}.bldr-toggle-track{width:38px;height:21px;border-radius:100px;background:var(--color-border);position:relative;transition:background .2s;flex-shrink:0}.bldr-toggle-track:after{content:"";position:absolute;top:3px;left:3px;width:15px;height:15px;border-radius:50%;background:#fff;box-shadow:0 1px 3px #0003;transition:transform .2s}.bldr-toggle-wrap input:checked~.bldr-toggle-track{background:var(--color-primary)}.bldr-toggle-wrap input:checked~.bldr-toggle-track:after{transform:translate(17px)}.bldr-toggle-label{font-size:var(--font-size-xs);color:var(--color-body);font-weight:500}