:root{--bg: #f8f7f5;--card: #ffffff;--border: #e4e4e4;--text: #202124;--muted: #909090;--accent: #f8d481;--blue: #2571d8;--radius: 8px;--shadow: 0 1px 2px rgba(0, 0, 0, .07)}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;font-size:15px;line-height:1.5}a{color:var(--blue);text-decoration:none}button{font-family:inherit}.topnav{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50}.topnav-inner{max-width:1120px;margin:0 auto;display:flex;align-items:center;gap:16px;padding:10px 16px}.group-switcher{display:flex;align-items:center;gap:10px;cursor:pointer;padding:6px 10px;border-radius:var(--radius);border:none;background:transparent;font-size:17px;font-weight:700;color:var(--text);position:relative}.group-switcher:hover{background:#f1f1f1}.group-logo{width:32px;height:32px;border-radius:6px;background:var(--accent);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;color:#4a3b10;overflow:hidden;flex:none}.group-logo img{width:100%;height:100%;object-fit:cover}.chevron{color:var(--muted);font-size:11px}.switcher-menu{position:absolute;top:110%;left:0;min-width:280px;background:#fff;border:1px solid var(--border);border-radius:10px;box-shadow:0 8px 30px #0000001f;padding:6px;z-index:60}.switcher-item{display:flex;align-items:center;gap:10px;width:100%;padding:8px 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var(--border);border-radius:12px;box-shadow:var(--shadow);padding:16px 0 8px;position:sticky;top:118px;max-height:calc(100vh - 140px);overflow-y:auto}.course-menu-top{padding:0 16px 12px;border-bottom:1px solid var(--border)}.course-menu-title{font-size:16px;font-weight:800;margin:0 0 10px}.set-block{padding:6px 8px 0}.set-header{width:100%;display:flex;align-items:center;justify-content:space-between;padding:8px;border:none;background:transparent;font-size:13px;font-weight:800;letter-spacing:.4px;text-transform:uppercase;color:#6f6f6f;cursor:pointer;border-radius:8px}.set-header:hover{background:#f5f5f5}.lesson-item{width:100%;display:flex;align-items:center;gap:10px;padding:9px 8px;border:none;background:transparent;border-radius:8px;cursor:pointer;font-size:14.5px;color:var(--text);text-align:left}.lesson-title-text{flex:1;min-width:0}.lesson-reorder{display:flex;gap:2px;opacity:0;transition:opacity .12s;flex:none}.lesson-item:hover .lesson-reorder{opacity:1}.lesson-reorder 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pre{background:#f4f4f4;padding:12px 14px;border-radius:8px;overflow-x:auto;font-size:13.5px}.lesson-content code{background:#f4f4f4;padding:1px 5px;border-radius:4px;font-size:13.5px}.lesson-content blockquote{border-left:3px solid var(--accent);margin:12px 0;padding:4px 14px;color:#555}.resources-box{margin-top:20px;background:var(--card);border:1px solid var(--border);border-radius:12px;padding:14px 16px}.resources-box h4{margin:0 0 8px;font-size:14px;text-transform:uppercase;letter-spacing:.4px;color:#6f6f6f}.resources-box a{display:block;padding:4px 0;font-weight:600}.btn{border:none;border-radius:8px;padding:9px 16px;font-size:14px;font-weight:700;cursor:pointer;background:#efefef;color:var(--text)}.btn:hover{filter:brightness(.96)}.btn.primary{background:var(--accent);color:#4a3b10}.btn.dark{background:#202124;color:#fff}.btn.danger{background:#fdecec;color:#c0392b}.btn.ghost{background:transparent;color:var(--muted)}.btn.small{padding:5px 10px;font-size:12.5px}.btn:disabled{opacity:.5;cursor:default}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000073;display:flex;align-items:flex-start;justify-content:center;padding:40px 16px;z-index:100;overflow-y:auto}.modal{background:#fff;border-radius:14px;width:100%;max-width:720px;padding:22px 24px 24px;box-shadow:0 20px 60px #00000040}.modal.small{max-width:440px}.modal h3{margin:0 0 16px;font-size:19px}.field{margin-bottom:14px}.field label{display:block;font-size:13px;font-weight:700;color:#555;margin-bottom:5px}.field input,.field select,.field textarea{width:100%;border:1px solid var(--border);border-radius:8px;padding:9px 11px;font-size:14.5px;font-family:inherit;outline:none;background:#fff}.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--blue)}.field-row{display:flex;gap:12px}.field-row 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var(--border);border-radius:10px;padding:20px 22px 26px;min-height:320px;max-height:60vh;overflow-y:auto}.builder-panel{width:240px;flex:none;background:#fff;border:1px solid var(--border);border-radius:10px;padding:14px;position:sticky;top:0;max-height:60vh;overflow-y:auto}.panel-title{margin:0 0 12px;font-size:13px;text-transform:uppercase;letter-spacing:.5px;color:#6f6f6f}.builder-block{position:relative;border:1.5px dashed transparent;border-radius:8px;padding:4px 8px;cursor:pointer}.builder-block:hover{border-color:#d8d8d8}.builder-block.sel{border-color:var(--accent);background:#fffdf5;cursor:default}.block-controls{position:absolute;top:-14px;right:6px;display:flex;align-items:center;gap:2px;background:#202124;border-radius:7px;padding:3px 5px;z-index:5}.block-controls .block-tag{color:var(--accent);font-size:11px;font-weight:800;padding:0 6px;text-transform:uppercase;letter-spacing:.4px}.block-controls button{border:none;background:transparent;color:#fff;font-size:12.5px;padding:2px 6px;border-radius:5px;cursor:pointer}.block-controls button:hover{background:#3a3a3a}.block-controls button.del:hover{background:#c0392b}.insert-line{height:10px;position:relative}.insert-line button{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:22px;height:22px;border-radius:50%;border:1px solid var(--border);background:#fff;color:#999;font-size:14px;line-height:1;cursor:pointer;opacity:0;transition:opacity .12s;z-index:4}.insert-line:hover button{opacity:1}.builder-addend{text-align:center;padding-top:14px}.editable{outline:none;min-width:20px;display:inline-block;width:100%}.fmt-bar{position:absolute;top:-14px;left:6px;display:inline-flex;gap:2px;background:#fff;border:1px solid var(--border);border-radius:7px;padding:2px 4px;box-shadow:var(--shadow);z-index:6}.fmt-bar button{border:none;background:transparent;padding:2px 7px;border-radius:5px;cursor:pointer;font-size:12.5px}.fmt-bar button:hover{background:#f1f1f1}.code-edit{width:100%;min-height:110px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:13px;border:1px solid var(--border);border-radius:8px;padding:10px;background:#f8f8f8}.img-placeholder{border:1.5px dashed #cfcfcf;border-radius:8px;padding:26px;text-align:center;color:#999;font-size:13.5px;background:#fafafa}.builder-spacer{border:1px dashed #e0e0e0;border-radius:6px;display:flex;align-items:center;justify-content:center;color:#bbb;font-size:11px}.seg{display:flex;gap:4px;flex-wrap:wrap}.seg button{border:1px solid var(--border);background:#fff;border-radius:7px;padding:6px 10px;font-size:12.5px;font-weight:700;cursor:pointer;color:#555}.seg button.on{background:var(--accent);border-color:var(--accent);color:#4a3b10}.palette-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000059;display:flex;align-items:center;justify-content:center;z-index:200}.palette{background:#fff;border-radius:14px;padding:18px 20px 20px;width:100%;max-width:460px;box-shadow:0 20px 60px #0000004d}.palette h4{margin:0 0 14px;font-size:16px}.palette-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.palette-item{border:1px solid var(--border);background:#fff;border-radius:10px;padding:12px 8px;display:flex;flex-direction:column;align-items:center;gap:6px;font-size:13px;font-weight:700;color:#444;cursor:pointer}.palette-item:hover{border-color:var(--accent);background:#fffbef}.palette-icon{font-size:19px}.lesson-content .b-callout{display:flex;gap:12px;align-items:flex-start;border-radius:10px;padding:14px 16px;margin:14px 0}.lesson-content .b-callout-emoji{font-size:20px;line-height:1.3}.lesson-content .b-callout-body>:first-child{margin-top:0}.lesson-content .b-callout-body>:last-child{margin-bottom:0}.lesson-content .content-btn{display:inline-block;padding:10px 22px;border-radius:8px;font-weight:800;font-size:15px;cursor:pointer}.lesson-content .content-btn-primary{background:var(--accent);color:#4a3b10}.lesson-content .content-btn-dark{background:#202124;color:#fff}.lesson-content .content-btn-outline{background:transparent;border:2px solid #202124;color:#202124}.lesson-content .b-video{aspect-ratio:16 / 9;background:#000;border-radius:10px;overflow:hidden;margin:14px 0}.lesson-content .b-video video,.lesson-content .b-video iframe{width:100%;height:100%;border:0;display:block}.lesson-content .b-image img{border-radius:8px}.lesson-content .b-spacer{width:100%}