:root{font-family:system-ui,-apple-system,sans-serif;line-height:1.5;font-weight:400;color:#1a1a1a;background-color:#fafafa;font-synthesis:none;-webkit-font-smoothing:antialiased}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}a{font-weight:500;color:#1a1a2e}button{font-family:inherit}@media(max-width:600px){body{font-size:15px}}.layout{min-height:100vh;display:flex;flex-direction:column}.layout-header{display:flex;align-items:center;justify-content:space-between;padding:.75rem 1rem;background:#1a1a2e;color:#eee;flex-wrap:wrap;gap:.5rem}.layout-brand{font-weight:700;font-size:1.25rem;color:#eee;text-decoration:none}.layout-nav{display:flex;align-items:center;gap:1rem}.layout-nav a{color:#aaa;text-decoration:none}.layout-nav a:hover{color:#fff}.layout-user{font-size:.9rem;color:#ccc}.layout-logout{background:transparent;border:1px solid #555;color:#ccc;padding:.35rem .75rem;border-radius:4px;cursor:pointer;font-size:.9rem}.layout-logout:hover{background:#333;color:#fff}.layout-main{flex:1;padding:1rem;max-width:900px;margin:0 auto;width:100%;box-sizing:border-box}@media(max-width:600px){.layout-header{padding:.5rem .75rem}.layout-main{padding:.75rem}}.auth-page{display:flex;justify-content:center;align-items:center;min-height:60vh;padding:1rem}.auth-form{width:100%;max-width:360px;padding:1.5rem;border:1px solid #ddd;border-radius:8px;background:#fff;box-shadow:0 2px 8px #00000014}.auth-form h1{margin:0 0 1rem;font-size:1.5rem}.auth-form label{display:block;margin-bottom:1rem;font-weight:500;font-size:.9rem}.auth-form input{display:block;width:100%;margin-top:.35rem;padding:.5rem .75rem;border:1px solid #ccc;border-radius:4px;font-size:1rem;box-sizing:border-box}.auth-form input:focus{outline:none;border-color:#1a1a2e}.auth-form button{width:100%;padding:.6rem 1rem;margin-top:.5rem;background:#1a1a2e;color:#fff;border:none;border-radius:4px;font-size:1rem;cursor:pointer}.auth-form button:hover:not(:disabled){background:#2a2a4e}.auth-form button:disabled{opacity:.7;cursor:not-allowed}.auth-error{color:#c00;font-size:.9rem;margin:0 0 .75rem}.auth-link{margin:1rem 0 0;font-size:.9rem;color:#555}.auth-link a{color:#1a1a2e;text-decoration:none}.auth-link a:hover{text-decoration:underline}.course-list h1{margin:0 0 1rem;font-size:1.5rem}.course-list-form{display:flex;gap:.5rem;margin-bottom:1.5rem;flex-wrap:wrap}.course-list-form input{flex:1;min-width:180px;padding:.5rem .75rem;border:1px solid #ccc;border-radius:4px;font-size:1rem}.course-list-form button{padding:.5rem 1rem;background:#1a1a2e;color:#fff;border:none;border-radius:4px;cursor:pointer;font-size:.95rem}.course-list-form button:hover:not(:disabled){background:#2a2a4e}.course-list-form button:disabled{opacity:.7;cursor:not-allowed}.course-list-ul{list-style:none;padding:0;margin:0}.course-list-ul li{margin-bottom:.5rem}.course-list-ul a{display:block;padding:.6rem .75rem;background:#f5f5f5;border-radius:4px;color:#1a1a2e;text-decoration:none}.course-list-ul a:hover{background:#eee}.course-list-empty{color:#666;padding:1rem 0}.loading,.error{padding:1rem 0}.error{color:#c00}.course-detail h1{margin:0 0 .5rem;font-size:1.5rem}.course-detail h2{margin:1.5rem 0 .75rem;font-size:1.15rem;font-weight:600}.breadcrumb{margin-bottom:.75rem;font-size:.9rem;color:#666}.breadcrumb a{color:#1a1a2e;text-decoration:none}.breadcrumb a:hover{text-decoration:underline}.session-form{display:flex;gap:.5rem;margin-bottom:1rem;flex-wrap:wrap}.session-form input{flex:1;min-width:180px;padding:.5rem .75rem;border:1px solid #ccc;border-radius:4px;font-size:1rem}.session-form button{padding:.5rem 1rem;background:#1a1a2e;color:#fff;border:none;border-radius:4px;cursor:pointer;font-size:.95rem}.session-form button:disabled{opacity:.7;cursor:not-allowed}.session-list{list-style:none;padding:0;margin:0}.session-list li{margin-bottom:.5rem}.session-list a{display:block;padding:.6rem .75rem;background:#f5f5f5;border-radius:4px;color:#1a1a2e;text-decoration:none}.session-list a:hover{background:#eee}.session-list .empty{color:#666;padding:1rem 0}.session-detail h1{margin:0 0 1rem;font-size:1.5rem}.session-detail h2{margin:1.25rem 0 .5rem;font-size:1.1rem;font-weight:600}.session-detail .breadcrumb{margin-bottom:.75rem;font-size:.9rem;color:#666}.session-detail .breadcrumb a{color:#1a1a2e;text-decoration:none}.uploads-section{margin-bottom:1.5rem}.upload-status{display:flex;align-items:center;gap:.5rem;padding:.6rem .75rem;margin-bottom:.75rem;border-radius:4px;font-size:.9rem}.upload-status--uploading{background:#e8f4fc;color:#0d47a1;border:1px solid #90caf9}.upload-status--success{background:#e8f5e9;color:#1b5e20;border:1px solid #81c784}.upload-status--error{background:#ffebee;color:#b71c1c;border:1px solid #e57373}.upload-status-spinner{display:inline-block;width:18px;height:18px;border:2px solid #90caf9;border-top-color:transparent;border-radius:50%;animation:upload-spin .8s linear infinite}@keyframes upload-spin{to{transform:rotate(360deg)}}.upload-label{display:inline-block;padding:.5rem 1rem;background:#f0f0f0;border-radius:4px;cursor:pointer;font-size:.95rem}.upload-label input{display:none}.upload-label:hover{background:#e5e5e5}.uploads-list-wrap{margin-top:.75rem}.uploads-list-toggle{padding:.4rem .75rem;font-size:.9rem;color:#1a1a2e;background:#f0f0f0;border:1px solid #ddd;border-radius:4px;cursor:pointer}.uploads-list-toggle:hover{background:#e5e5e5}.uploads-list-toggle[aria-expanded=true]{margin-bottom:.5rem}.uploads-list{list-style:none;padding:.5rem 0 0;margin:0;font-size:.9rem;color:#555;max-height:12rem;overflow-y:auto}.uploads-list li{margin-bottom:.25rem}.notes-section{border-top:1px solid #eee;padding-top:1rem;max-width:48rem}.notes-view .notes-content{min-height:120px;padding:.75rem;background:#f9f9f9;border-radius:4px;margin-bottom:.75rem}.notes-text{margin:0;white-space:pre-wrap;font-family:inherit;font-size:.95rem;line-height:1.5}.notes-empty{margin:0;color:#888}.notes-edit-btn{padding:.4rem .75rem;background:#1a1a2e;color:#fff;border:none;border-radius:4px;cursor:pointer;font-size:.9rem}.notes-edit-btn:hover{background:#2a2a4e}.notes-edit textarea{width:100%;padding:.75rem;border:1px solid #ccc;border-radius:4px;font-size:.95rem;font-family:inherit;box-sizing:border-box;resize:vertical}.notes-actions{display:flex;gap:.5rem;margin-top:.5rem}.notes-actions button{padding:.4rem .75rem;border-radius:4px;cursor:pointer;font-size:.9rem}.notes-actions button:first-child{background:#1a1a2e;color:#fff;border:none}.notes-actions button:first-child:hover:not(:disabled){background:#2a2a4e}.notes-actions button:last-child{background:#fff;border:1px solid #ccc;color:#333}.notes-actions button:disabled{opacity:.7;cursor:not-allowed}.notes-blocks{display:flex;flex-direction:column;gap:1rem}.notes-block-text{margin:0}.notes-block-text .notes-text{margin:0;white-space:pre-wrap;font-size:1rem;line-height:1.65}.notes-block-image{margin:.5rem 0}.notes-image-click-wrap{cursor:pointer;display:inline-block;border-radius:6px;overflow:hidden;transition:box-shadow .15s,transform .15s}.notes-image-click-wrap:hover{box-shadow:0 4px 12px #00000026}.notes-image-click-wrap:focus{outline:2px solid #1a1a2e;outline-offset:2px}.notes-embed-img{max-width:100%;height:auto;border-radius:4px;display:block}.notes-blocks-edit{display:flex;flex-direction:column;gap:1rem}.notes-block-card{display:flex;gap:.5rem;align-items:flex-start;padding:.75rem;border:1px solid #e0e0e0;border-radius:8px;background:#fff;transition:border-color .15s,box-shadow .15s}.notes-block-card:hover{border-color:#ccc}.notes-block-card.notes-block-drag-over{border-color:#1a1a2e;box-shadow:0 0 0 2px #1a1a2e33}.notes-block-card.notes-block-dragging{opacity:.6}.notes-block-drag-handle{flex-shrink:0;padding:.35rem .25rem;margin:-.2rem 0 0 -.2rem;color:#999;cursor:grab;font-size:1rem;line-height:1;-webkit-user-select:none;user-select:none;border-radius:4px}.notes-block-drag-handle:hover{color:#666;background:#f0f0f0}.notes-block-drag-handle:active{cursor:grabbing}.notes-block-edit{flex:1;min-width:0}.notes-block-edit textarea{width:100%;padding:.75rem 1rem;border:1px solid #ddd;border-radius:6px;font-size:1rem;line-height:1.6;font-family:inherit;box-sizing:border-box;resize:vertical;min-height:12rem;transition:border-color .15s}.notes-block-edit textarea:focus{outline:none;border-color:#1a1a2e;box-shadow:0 0 0 2px #1a1a2e1a}.notes-block-edit>.notes-block-remove{margin-top:.5rem}.notes-block-image-edit{display:flex;flex-direction:column;gap:.25rem}.notes-block-remove{align-self:flex-start;padding:.25rem .5rem;font-size:.85rem;background:#fff;border:1px solid #ccc;border-radius:4px;cursor:pointer;color:#666}.notes-block-remove:hover:not(:disabled){background:#ffebee;color:#b71c1c;border-color:#e57373}.notes-block-toolbar{display:flex;flex-wrap:wrap;align-items:center;gap:.75rem;margin-top:.5rem;padding:.5rem 0;border-top:1px solid #eee}.notes-block-toolbar button,.notes-insert-image select{padding:.35rem .6rem;font-size:.9rem;border-radius:4px}.notes-gap-insert{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem 1rem;margin:.35rem 0}.notes-gap-add-text{padding:.25rem .5rem;font-size:.85rem;color:#1a1a2e;background:#f0f0f0;border:1px solid #ddd;border-radius:4px;cursor:pointer}.notes-gap-add-text:hover:not(:disabled){background:#e5e5e5}.notes-insert-image-inline{display:inline-flex;align-items:center;gap:.35rem;font-size:.85rem;color:#666}.notes-insert-image-inline .notes-insert-image-label{flex-shrink:0}.notes-insert-image-inline select{padding:.25rem .5rem;font-size:.85rem;border:1px solid #ddd;border-radius:4px;background:#fafafa;min-width:10rem}.notes-insert-image label{display:inline-flex;align-items:center;gap:.35rem;font-size:.9rem;color:#555}.auth-image-loading,.auth-image-error{display:inline-block;padding:.5rem;font-size:.9rem;color:#888}.auth-image-error{color:#b71c1c}.notes-lightbox-backdrop{position:fixed;inset:0;z-index:1000;background:#000000d9;display:flex;align-items:center;justify-content:center;padding:2rem;box-sizing:border-box}.notes-lightbox-close{position:absolute;top:1rem;right:1rem;width:2.5rem;height:2.5rem;padding:0;font-size:1.75rem;line-height:1;color:#fff;background:#ffffff26;border:none;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s}.notes-lightbox-close:hover{background:#ffffff4d}.notes-lightbox-content{max-width:90vw;max-height:90vh;display:flex;align-items:center;justify-content:center}.notes-lightbox-img{max-width:100%;max-height:85vh;width:auto;height:auto;object-fit:contain;border-radius:4px}