:root{font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#222;background:#f8f5ef;line-height:1.45}*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0}button,input,textarea,select{font:inherit}button{cursor:pointer;background:#6b5eff;color:#fff;border:1px solid #6b5eff;border-radius:10px;padding:11px 16px;font-weight:700}button:hover{filter:brightness(.95)}button:disabled{opacity:.55;cursor:not-allowed}button.secondary{background:#fff;color:#36313e;border-color:#ded9ea}button.danger{background:#fff;color:#bb354d;border-color:#f1ced5}a{color:#5041d3}input,textarea,select{width:100%;border:1px solid #d8d4df;border-radius:9px;background:#fff;padding:11px;color:#222}input:focus,textarea:focus,select:focus{outline:2px solid #9a91ff;outline-offset:1px}label{display:flex;flex-direction:column;gap:5px;font-weight:650;font-size:14px}.topbar{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 5%;border-bottom:1px solid #ebe6de;background:#fff}.topbar #account{display:flex;align-items:center;gap:14px;font-size:13px}.logo{background:#6b5eff;color:#fff;border-radius:11px;font-weight:900;padding:9px 12px}.logo span{margin-left:8px;background:#fff;color:#383343;border-radius:6px;padding:3px 8px;font-weight:650}.auth-panel{width:min(440px,92%);margin:8vh auto;background:#fff;border:1px solid #ece6e4;border-radius:22px;padding:32px;box-shadow:0 20px 45px #2221}.auth-panel form,.editor form{display:grid;gap:16px}.auth-panel h1{margin:6px 0 10px;font-size:28px}.muted{color:#726d79}.small{font-size:13px}.eyebrow{text-transform:uppercase;color:#7664da;font-weight:800;letter-spacing:.1em;font-size:11px;margin:0}.workspace{display:grid;grid-template-columns:290px minmax(0,1fr);min-height:calc(100vh - 72px);max-width:1500px;margin:auto}.sidebar{background:#fff;border-right:1px solid #e6e0ea;padding:30px 22px}.sidebar h1{margin:6px 0}.course-list{display:grid;gap:9px;margin-top:26px}.course-list button{background:#f8f5ef;text-align:left;color:#222;border:1px solid #eae5dd;font-size:14px;font-weight:650}.course-list button.active{background:#ece9ff;border-color:#aaa1ff}.course-list small{display:block;font-weight:400;color:#736f79;margin-top:4px}.wide{width:100%}.editor{padding:34px;min-width:0}.editor h2{font-size:24px;margin:5px 0 18px}.between{display:flex;align-items:center;justify-content:space-between;gap:16px}.empty{border:1px dashed #c6bfe8;border-radius:20px;padding:45px;background:#fff}.pill{font-size:12px;color:#5e54ac;background:#efecff;border-radius:30px;padding:6px 10px}#course-form,.module-card,.preview-panel{background:#fff;border:1px solid #e8e1e7;border-radius:18px;padding:24px;margin:18px 0}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:16px}.actions{display:flex;gap:10px;flex-wrap:wrap}.module-card h3{margin:0 0 15px;font-size:18px}.module-card .module-form,.lesson-card .lesson-form{display:grid;gap:12px}.lesson-card{padding:15px 0;border-top:1px solid #efeaeb}.lesson-card h4{margin:4px 0 12px}.materials{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:8px}.file-entry{display:inline-flex;gap:7px;align-items:center;background:#f4f2ff;border:1px solid #e4dfff;padding:7px 9px;border-radius:9px;font-size:13px}.file-entry button{padding:1px 6px;font-size:12px}.upload{margin-top:10px;border:1px dashed #bbb3dd;padding:12px;border-radius:12px}.upload input{max-width:100%}.preview-panel{background:#f7f5ff}.preview-panel h3{margin:0 0 12px}#message{position:fixed;bottom:18px;right:18px;padding:12px 16px;border-radius:12px;background:#222;color:#fff;box-shadow:0 6px 24px #2224;max-width:400px}#message:empty{display:none}#message.error{background:#ae3045}.hint{font-size:12px;color:#666}.section-divider{margin:24px 0;border:0;border-top:1px solid #ece8e8}@media(max-width:850px){.workspace{display:block}.sidebar{border-right:0;border-bottom:1px solid #e6e0ea}.editor{padding:18px}.two-col{grid-template-columns:1fr}.topbar{padding:0 15px}.auth-panel{margin:30px auto;padding:20px}.between{flex-wrap:wrap}}