.ai-file-warning{background:#fff8e6;border:1px solid #f0d78c;color:#6b5a1e;border-radius:var(--radius-sm);padding:10px 12px;font-size:0.88rem;margin-bottom:12px;line-height:1.4;}#feedback-form{display:grid;gap:12px;}#feedback-form .btn{justify-self:start;}.wysiwyg{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);overflow:hidden;}.wysiwyg:focus-within{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-soft);}.wysiwyg-toolbar{display:flex;gap:4px;padding:6px 8px;border-bottom:1px solid var(--border);background:#f7f8fa;}.wysiwyg-btn{border:1px solid var(--border);background:#fff;border-radius:6px;padding:4px 10px;font-size:0.85rem;cursor:pointer;color:var(--text);}.wysiwyg-btn:hover{background:var(--primary-soft);border-color:var(--primary);}.wysiwyg-editor{min-height:130px;padding:12px;font-family:inherit;font-size:0.95rem;line-height:1.5;outline:none;}.wysiwyg-editor:empty:before{content:attr(data-placeholder);color:var(--text-muted);pointer-events:none;}.wysiwyg-editor ul{margin:0.4em 0 0.4em 1.2em;padding:0;}.feedback-send-status{font-size:0.88rem;color:var(--primary);margin:0;}.feedback-send-status--error{color:var(--danger);}.feedback-sent-hint{margin:0;padding:10px 12px;border-radius:var(--radius-sm);background:#e8f7ee;color:#1b6b3a;font-size:0.9rem;font-weight:600;}.feedback-view{border-left:3px solid var(--accent);background:var(--accent-bg);}.feedback-html{font-size:0.95rem;line-height:1.5;}.feedback-html ul{margin:0.4em 0 0.4em 1.2em;}.btn-sm{padding:7px 14px;font-size:0.83rem;border-radius:8px;}.header-btns{display:flex;gap:12px;align-items:center;}.material-card-lg{display:flex;flex-direction:column;cursor:default;}.material-card-lg:hover{transform:none;}.material-card-info{margin-top:8px;}.card-actions{display:flex;align-items:center;gap:14px;margin-top:16px;padding-top:14px;border-top:1px solid var(--border);}.blocks-view{display:flex;flex-direction:column;gap:12px;}.block{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px;box-shadow:var(--shadow);font-size:0.95rem;}.block--note{white-space:normal;line-height:1.55;}.block--link{display:flex;align-items:center;gap:8px;}.block--link a{color:var(--primary);word-break:break-all;font-weight:500;}.block-ico{flex-shrink:0;}.block-file-name{display:flex;align-items:center;gap:8px;font-weight:500;margin-bottom:10px;}.block--file a{color:var(--primary);word-break:break-all;}.block-img{max-width:100%;max-height:320px;border-radius:10px;border:1px solid var(--border);display:block;}.editor-page{max-width:780px;}.editor-section{margin-top:24px;}.editor-section-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px;}.blocks-editor{display:flex;flex-direction:column;gap:12px;}.blocks-empty{padding:8px 0;}.block-row{display:flex;align-items:flex-start;gap:12px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px;box-shadow:var(--shadow);}.block-row-body{flex:1;min-width:0;}.block-row-body .block{border:none;box-shadow:none;padding:0;background:transparent;}.block-row-actions{display:flex;flex-direction:column;gap:6px;flex-shrink:0;}.block-editor{border:1px solid var(--primary);border-radius:var(--radius);padding:16px;background:var(--primary-soft);display:flex;flex-direction:column;gap:10px;}.block-editor-head{font-size:0.78rem;font-weight:700;text-transform:uppercase;letter-spacing:0.04em;color:var(--primary);}.block-editor input{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius-sm);font-family:inherit;font-size:0.95rem;background:var(--surface);}.block-editor .wysiwyg{background:var(--surface);}.block-editor-actions{display:flex;align-items:center;gap:14px;}.file-input-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px;}.file-input-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;}.file-pick-btn{cursor:pointer;margin:0;}.file-current{font-size:0.82rem;color:var(--text-muted);}.add-block-row{display:flex;gap:10px;align-items:center;}.add-block-type{padding:9px 12px;border:1px solid var(--border);border-radius:var(--radius-sm);font-family:inherit;font-size:0.9rem;background:var(--surface);}.hw-editor-block{border:1px dashed var(--border);border-radius:var(--radius);padding:16px;background:#fbfbfe;}.hw-meta-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:16px;}.label-hint{font-weight:400;color:var(--text-muted);font-size:0.8rem;}.hw-meta{display:flex;flex-wrap:wrap;gap:14px;align-items:center;margin-top:12px;font-size:0.9rem;color:var(--text-muted);}.vis-tag{font-size:0.68rem;font-weight:600;padding:2px 8px;border-radius:999px;text-transform:uppercase;letter-spacing:0.03em;margin-left:6px;vertical-align:middle;}.vis-yes{background:var(--accent-bg);color:var(--accent);}.vis-no{background:#f1f3f6;color:var(--text-muted);}.profile-note--private{color:var(--text-muted);font-style:italic;margin-top:6px;}.add-material-box{display:flex;gap:12px;align-items:center;flex-wrap:wrap;}.add-material-box select{flex:1;min-width:220px;padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius-sm);font-family:inherit;font-size:0.95rem;background:var(--surface);}.feedback-foot{display:flex;gap:12px;align-items:center;flex-wrap:wrap;}.feedback-foot select{padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius-sm);font-family:inherit;font-size:0.92rem;background:var(--surface);}.gate{position:fixed;inset:0;z-index:1000;display:grid;place-items:center;background:radial-gradient(ellipse at 20% 20%,rgba(79,70,229,0.12),transparent 50%),radial-gradient(ellipse at 80% 80%,rgba(5,150,105,0.1),transparent 45%),var(--bg);padding:24px;}.gate[hidden]{display:none !important;}.gate-card{width:min(400px,100%);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-lg);padding:28px 24px;display:flex;flex-direction:column;gap:12px;}.gate-brand{margin:0;font-size:0.95rem;color:var(--text-muted);letter-spacing:0.02em;}.gate-title{margin:0;font-size:1.45rem;font-weight:700;color:var(--text);}.gate-hint{margin:0;color:var(--text-muted);font-size:0.92rem;line-height:1.45;}.auth-tabs{display:flex;gap:4px;padding:4px;background:var(--bg);border-radius:var(--radius-sm);}.auth-tab{flex:1;border:none;background:transparent;padding:8px 10px;border-radius:7px;font:inherit;font-size:0.9rem;color:var(--text-muted);cursor:pointer;}.auth-tab.active{background:var(--surface);color:var(--text);font-weight:600;box-shadow:var(--shadow);}.auth-panel{display:flex;flex-direction:column;gap:10px;}.auth-panel[hidden]{display:none !important;}.gate-label{font-size:0.82rem;color:var(--text-muted);margin-bottom:-4px;}.gate-input{padding:12px 14px;border:1px solid var(--border);border-radius:var(--radius-sm);font-family:inherit;font-size:1rem;background:var(--bg);}.gate-input:focus{outline:2px solid var(--primary-soft);border-color:var(--primary);}.gate-error{margin:0;color:var(--danger);font-size:0.88rem;}.gate-submit{align-self:flex-start;margin-top:4px;}.gate-password-hint{margin:-2px 0 0;font-size:0.82rem;color:var(--text-muted);line-height:1.4;}.topbar-user{display:flex;align-items:center;gap:10px;margin-left:auto;}.topbar-user[hidden]{display:none;}.topbar-email{font-size:0.85rem;color:var(--text-muted);max-width:180px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}.btn-ghost{background:transparent;border:1px solid var(--border);color:var(--text-muted);padding:6px 12px;border-radius:var(--radius-sm);font:inherit;font-size:0.85rem;cursor:pointer;}.btn-ghost:hover{color:var(--text);border-color:var(--text-muted);}.gate-help-link{margin:4px 0 0;text-align:center;font-size:0.9rem;}.gate-help-link a{color:var(--primary);text-decoration:none;}.gate-help-link a:hover{text-decoration:underline;}.topbar-help{font-size:0.85rem;color:var(--text-muted);text-decoration:none;padding:6px 8px;}.topbar-help:hover{color:var(--primary);}#product-feedback{position:fixed;right:20px;bottom:20px;z-index:40;}.fb-fab{border:none;border-radius:999px;padding:12px 18px;background:var(--text);color:#fff;font:inherit;font-size:0.9rem;font-weight:600;cursor:pointer;box-shadow:var(--shadow-lg);}.fb-fab:hover{background:#2a2e3a;}.fb-backdrop{position:fixed;inset:0;background:rgba(20,22,29,0.45);display:grid;place-items:center;padding:16px;z-index:50;}.fb-backdrop[hidden]{display:none;}.fb-modal{width:min(440px,100%);background:var(--surface);border-radius:var(--radius);padding:22px 22px 18px;box-shadow:var(--shadow-lg);border:1px solid var(--border);}.fb-modal h2{font-size:1.15rem;margin-bottom:6px;}.fb-hint{color:var(--text-muted);font-size:0.9rem;margin-bottom:12px;}.fb-modal textarea{width:100%;resize:vertical;min-height:110px;border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px 12px;font:inherit;margin-bottom:10px;}.fb-modal textarea:focus{outline:2px solid var(--primary-soft);border-color:var(--primary);}.fb-actions{display:flex;justify-content:flex-end;gap:8px;}.fb-status{font-size:0.88rem;margin-bottom:10px;}.fb-status.ok{color:var(--accent);}.fb-status.err{color:var(--danger);}#tips-widget{position:fixed;right:20px;bottom:76px;z-index:40;}.tips-fab{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--border);border-radius:999px;padding:11px 17px;background:var(--surface);color:var(--primary);font:inherit;font-size:0.9rem;font-weight:600;cursor:pointer;box-shadow:var(--shadow-lg);}.tips-fab:hover{background:var(--primary-soft);border-color:var(--primary);}.tips-backdrop{position:fixed;inset:0;background:rgba(20,22,29,0.45);display:grid;place-items:center;padding:16px;z-index:50;}.tips-backdrop[hidden]{display:none;}.tips-modal{position:relative;width:min(440px,100%);background:var(--surface);border-radius:var(--radius);padding:22px 22px 18px;box-shadow:var(--shadow-lg);border:1px solid var(--border);}.tips-modal h2{font-size:1.15rem;margin-bottom:8px;padding-right:28px;}.tips-text{font-size:0.92rem;line-height:1.5;margin-bottom:10px;}.tips-note{color:var(--text-muted);font-size:0.85rem;line-height:1.45;margin-bottom:16px;}.tips-actions{display:flex;justify-content:flex-end;}.tips-close{position:absolute;top:10px;right:12px;border:none;background:none;color:var(--text-muted);font-size:1.4rem;line-height:1;cursor:pointer;padding:4px 8px;}.tips-close:hover{color:var(--text);}@media (max-width:860px){.topbar{flex-wrap:wrap;padding:12px 16px;gap:12px;}.brand-sub{display:none;}.tab-switch{width:100%;}.tab-btn{flex:1;}.subhead{padding:16px 16px 0;flex-wrap:wrap;}.main{padding:16px;}.detail-grid,.form-grid,.material-picker,.hw-meta-row{grid-template-columns:1fr;}.block-row{flex-direction:column;}.block-row-actions{flex-direction:row;}.profile-header{flex-direction:column;}.course-hero{padding:24px;}.course-hero-title{font-size:1.5rem;}#product-feedback{right:12px;bottom:12px;}.fb-fab{font-size:0.82rem;padding:10px 14px;}#tips-widget{right:12px;bottom:62px;}.tips-fab{font-size:0.82rem;padding:9px 14px;}}