:root{--bg:#f4f5f7;--card:#fff;--ink:#1a1d23;--muted:#6b7280;--line:#e5e7eb;--brand:#4f46e5;--brand-dark:#4338ca;--green:#16a34a;--red:#dc2626;--amber:#d97706}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html{touch-action:manipulation}body{background:var(--bg);color:var(--ink);margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:16px;line-height:1.45}.app{flex-direction:column;max-width:640px;min-height:100dvh;margin:0 auto;display:flex}main{padding:12px 16px calc(32px + env(safe-area-inset-bottom));flex:1}.topbar{z-index:10;padding:calc(10px + env(safe-area-inset-top)) 16px 10px;background:var(--card);border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:8px;display:flex;position:sticky;top:0}.brand{color:var(--brand);font-size:20px;font-weight:800;text-decoration:none}.who{align-items:center;gap:8px;min-width:0;display:flex}.avatar{border-radius:50%;width:28px;height:28px}.who-name{text-overflow:ellipsis;white-space:nowrap;max-width:110px;font-size:14px;overflow:hidden}.signout{color:var(--muted);white-space:nowrap;font-size:14px}h2{margin:14px 0 8px;font-size:22px}h3{margin:20px 0 8px;font-size:17px}.muted{color:var(--muted)}.small{font-size:13px}.center{text-align:center;padding:24px 0}.empty{padding:32px 16px}.error{color:var(--red);background:#fef2f2;border:1px solid #fecaca;border-radius:10px;padding:10px 14px}.ok{color:var(--green)}.card{background:var(--card);border:1px solid var(--line);color:inherit;border-radius:14px;margin:10px 0;padding:14px 16px;text-decoration:none;display:block}.course-card .course-title{margin-bottom:2px;font-size:17px;font-weight:700}.item-row,.learner-row{align-items:center;gap:12px;display:flex}.item-icon{text-align:center;flex:none;width:28px;font-size:20px}.item-main{flex-direction:column;flex:1;min-width:0;display:flex}.item-title{overflow-wrap:anywhere;font-weight:600}.tick{color:var(--green);font-size:18px;font-weight:800}.back{color:var(--brand);min-height:40px;padding:8px 0;font-weight:600;text-decoration:none;display:inline-block}.course-head .btn{margin-top:10px}.progress{align-items:center;gap:10px;height:22px;margin-top:10px;display:flex}.progress .track{background:var(--line);border-radius:4px;flex:1;height:8px;overflow:hidden}.progress .bar{background:var(--green);border-radius:4px;height:8px;transition:width .3s}.progress .small{white-space:nowrap}.btn{border:1px solid var(--line);background:var(--card);min-height:46px;color:var(--ink);cursor:pointer;border-radius:12px;justify-content:center;align-items:center;gap:6px;padding:10px 18px;font-family:inherit;font-size:16px;font-weight:600;text-decoration:none;display:inline-flex}.btn:active{transform:scale(.98)}.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff}.btn.primary:active{background:var(--brand-dark)}.btn.big{width:100%;min-height:52px;margin:8px 0;font-size:17px}.btn.small{min-height:38px;padding:6px 12px;font-size:14px}.btn.danger{color:var(--red);border-color:#fecaca}.btn:disabled{opacity:.5}.iconbtn{min-width:44px;min-height:44px;color:var(--muted);cursor:pointer;background:0 0;border:none;font-size:18px}.iconbtn.danger{color:var(--red)}.iconbtn:disabled{opacity:.3}.form label{color:var(--muted);margin:10px 0 4px;font-size:14px;font-weight:600;display:block}input,textarea,select{border:1px solid var(--line);width:100%;color:var(--ink);background:#fff;border-radius:10px;padding:12px 14px;font-family:inherit;font-size:17px}input:focus,textarea:focus{outline:2px solid var(--brand);outline-offset:-1px}textarea{resize:vertical}.row{align-items:center;gap:10px;display:flex}.row input{flex:1}.tabs{gap:8px;margin:8px 0 4px;display:flex}.tab{border:1px solid var(--line);background:var(--card);min-height:44px;color:var(--muted);cursor:pointer;border-radius:10px;flex:1;font-family:inherit;font-size:16px;font-weight:600}.tab.on{background:var(--brand);border-color:var(--brand);color:#fff}.edit-row-top{align-items:center;gap:8px;display:flex}.edit-actions{flex:none;display:flex}.add-grid{grid-template-columns:1fr 1fr;gap:10px;margin:8px 0;display:grid}.addbtn{flex-direction:column;gap:4px;padding:16px 8px}.addbtn.on{outline:2px solid var(--brand)}.item-form{border-color:var(--brand)}.danger-zone{text-align:center;margin:28px 0 8px}.quiz-builder .qbuild{border-top:1px dashed var(--line);padding:10px 0}.qbuild-head{justify-content:space-between;align-items:center;display:flex}.opt-row{align-items:center;gap:6px;margin:6px 0;display:flex}.opt-row input{flex:1}.radio{min-width:44px;min-height:44px;color:var(--muted);cursor:pointer;background:0 0;border:none;font-size:20px}.radio.on{color:var(--green)}.q-text{overflow-wrap:anywhere;margin-bottom:10px;font-weight:600}.option{text-align:left;border:1px solid var(--line);cursor:pointer;overflow-wrap:anywhere;background:#fff;border-radius:10px;width:100%;min-height:48px;margin:6px 0;padding:12px 14px;font-family:inherit;font-size:16px;display:block}.option.picked{border-color:var(--brand);outline:2px solid var(--brand);outline-offset:-1px}.option.static{cursor:default}.option.right{border-color:var(--green);background:#f0fdf4}.option.wrong{border-color:var(--red);background:#fef2f2}.score-card{text-align:center;padding:24px}.score{color:var(--brand);font-size:40px;font-weight:800}.done-note{text-align:center;color:var(--green);padding:12px;font-size:17px;font-weight:700}.video-wrap{aspect-ratio:16/9;background:#000;border-radius:14px;width:100%;margin:10px 0;position:relative;overflow:hidden}.video-wrap iframe{border:0;width:100%;height:100%;position:absolute;inset:0}.text-body{white-space:pre-wrap;overflow-wrap:anywhere;font-size:16px;line-height:1.6}.file-card{text-align:center}.file-name{overflow-wrap:anywhere;font-weight:600}.login{min-height:100dvh;padding:24px;padding-bottom:calc(24px + env(safe-area-inset-bottom));justify-content:center;align-items:center;display:flex}.login-card{background:var(--card);border:1px solid var(--line);text-align:center;border-radius:18px;width:100%;max-width:380px;padding:32px 24px}.login-card h1{color:var(--brand);margin:0 0 4px}.item-icon{color:var(--primary,#4f46e5);justify-content:center;align-items:center;display:inline-flex}.btn-ico{vertical-align:-3px;margin-right:6px;display:inline-flex}.file-name{justify-content:center;align-items:center;gap:8px;display:flex}