:root{--ink:#152129;--ink-hover:#294039;--muted:#6c777e;--paper:#f7f8f6;--white:#fff;--line:#dfe4df;--green:#ddede3;--accent:#2d6551;--focus:#478b71;--danger:#a3372b;--warn-bg:#f6e8d8;--warn-ink:#7a4a18;--radius:20px;--tab-height:64px;color:var(--ink);background:var(--paper);font-synthesis:none;-webkit-text-size-adjust:100%;font-family:DM Sans,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:17px}*{box-sizing:border-box}body{background:var(--paper);min-height:100dvh;margin:0}h1,h2,h3,p{margin:0}h1,h2,h3{font-family:Manrope,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-weight:700}h1{letter-spacing:-1px;font-size:28px;line-height:1.2}h2{letter-spacing:-.6px;font-size:21px;line-height:1.35}h3{letter-spacing:-.3px;font-size:17px;line-height:1.4}p{line-height:1.6}a{color:inherit;text-decoration:none}button,input,textarea,select{font:inherit;color:inherit}button{cursor:pointer;background:0 0;border:0}button:disabled{cursor:default;opacity:.45}:focus-visible{outline:3px solid var(--focus);outline-offset:3px}.eyebrow{letter-spacing:1.7px;color:var(--accent);text-transform:uppercase;font-size:11px;font-weight:700;line-height:1.6;display:block}.muted{color:var(--muted)}.small{font-size:13px}.break{overflow-wrap:anywhere}.masthead{color:#fff;padding:14px 16px;padding-top:max(14px, env(safe-area-inset-top));z-index:5;background:#000;justify-content:space-between;align-items:center;gap:12px;display:flex;position:sticky;top:0}.brand{align-items:center;gap:10px;min-width:0;display:flex}.brand img{object-fit:contain;flex-shrink:0;width:44px;height:32px}.brand-copy{flex-direction:column;min-width:0;display:flex}.brand-title{letter-spacing:1px;font-family:Manrope,sans-serif;font-size:13px;font-weight:700;line-height:1.25}.brand-subtitle{letter-spacing:2px;text-transform:uppercase;opacity:.75;margin-top:3px;font-size:10px}.masthead-user{align-items:center;gap:12px;font-size:13px;display:flex}.masthead-email{opacity:.8;display:none}.masthead .link-button{color:#fff}.shell{min-height:100dvh}.content{padding:20px 16px calc(var(--tab-height) + 32px + env(safe-area-inset-bottom));flex-direction:column;gap:16px;max-width:980px;margin:0 auto;display:flex}.nav{z-index:6;background:var(--white);border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom);grid-template-columns:repeat(3,1fr);display:grid;position:fixed;inset:auto 0 0}.nav-item{height:var(--tab-height);color:var(--muted);flex-direction:column;justify-content:center;align-items:center;gap:2px;font-size:12px;font-weight:600;display:flex}.nav-icon{font-size:20px;line-height:1}.nav-item.active{color:var(--ink)}.nav-item.active .nav-icon{color:var(--accent)}@media (width>=1024px){:root{font-size:15px}h1{letter-spacing:-1.4px;font-size:36px}.masthead{padding:18px 40px}.brand img{width:60px;height:44px}.brand-title{letter-spacing:1.5px;font-size:16px}.masthead-email{display:inline}.shell{grid-template-rows:auto 1fr;grid-template-columns:240px 1fr;display:grid}.shell .masthead{grid-column:1/-1}.nav{background:0 0;border:0;flex-direction:column;align-self:start;gap:4px;padding:32px 16px;display:flex;position:sticky;top:80px}.nav-item{border-radius:9px;flex-direction:row;justify-content:flex-start;gap:12px;height:44px;padding:0 14px;font-size:14px}.nav-item.active{background:var(--white);border:1px solid var(--line)}.content{width:100%;margin:0;padding:36px 40px 64px}}.card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);flex-direction:column;gap:12px;padding:18px;display:flex}.stack{flex-direction:column;gap:16px;display:flex}.page-head{flex-direction:column;align-items:flex-start;gap:10px;display:flex}.row-head{flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:12px;display:flex}.row-actions{flex-wrap:wrap;align-items:center;gap:8px 16px;display:flex}.back{color:var(--accent);font-size:14px;font-weight:600}.button{text-align:center;border:1px solid #0000;border-radius:9px;justify-content:center;align-items:center;gap:10px;min-height:48px;padding:12px 20px;font-size:15px;font-weight:600;transition:background .15s,transform .15s;display:inline-flex}.button.small{min-height:40px;padding:8px 14px;font-size:14px}.button.block{width:100%}.primary{background:var(--ink);color:#fff}.primary:hover:not(:disabled){background:var(--ink-hover)}.secondary{background:var(--white);border-color:var(--line);color:var(--ink)}.danger{background:var(--danger);color:#fff}.link-button{color:var(--accent);min-height:40px;padding:8px 0;font-size:14px;font-weight:600}.danger-text{color:var(--danger)}.icon-button{border:1px solid var(--line);background:var(--white);border-radius:9px;width:40px;height:40px;font-weight:700}.tag{color:#59675c;white-space:nowrap;background:#e9ede7;border-radius:30px;align-items:center;padding:6px 11px;font-size:12px;line-height:1.3;display:inline-flex}.tag-dark{color:#28523c;background:#dceade;font-weight:600}.tag-warn{background:var(--warn-bg);color:var(--warn-ink);font-weight:600}.chips{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.chip{background:var(--green);border-radius:12px;flex-direction:column;gap:2px;max-width:100%;padding:10px 14px;font-size:14px;font-weight:600;display:inline-flex}.chip-type{letter-spacing:1.4px;text-transform:uppercase;color:var(--accent);font-size:10px;font-weight:700}.stat-grid{grid-template-columns:repeat(2,1fr);gap:12px;display:grid}.stat{gap:4px}.stat-value{letter-spacing:-1px;font-family:Manrope,sans-serif;font-size:28px;font-weight:700}.stat-label{color:var(--muted);font-size:13px}@media (width>=1024px){.stat-grid{grid-template-columns:repeat(4,1fr)}}.lesson{border-top:1px solid var(--line)}.lesson summary{cursor:pointer;align-items:center;gap:12px;min-height:56px;padding:14px 0;list-style:none;display:flex}.lesson summary::-webkit-details-marker{display:none}.lesson-number{color:var(--accent);font-family:Manrope,sans-serif;font-weight:700}.lesson-title{flex:1;font-weight:600;line-height:1.4}.lesson-body{flex-direction:column;gap:12px;padding-bottom:16px;display:flex}.video-list{flex-direction:column;gap:10px;margin:0;padding:0;list-style:none;display:flex}.video-row{border:1px solid var(--line);background:var(--paper);border-radius:12px;flex-direction:column;gap:10px;padding:14px;display:flex}.video-main{flex-direction:column;gap:4px;min-width:0;display:flex}.video-title{font-weight:600}.video-actions{flex-wrap:wrap;align-items:center;gap:8px 12px;display:flex}.module-finals{border-top:1px solid var(--line);padding-top:14px}@media (width>=1024px){.video-row{flex-direction:row;justify-content:space-between;align-items:center}}.question-list{flex-direction:column;gap:12px;margin:0;padding:0;list-style:none;display:flex}.prompt,.prompt-preview{overflow-wrap:anywhere;font-weight:700;line-height:1.6}.prompt-preview{background:var(--paper);border-radius:10px;padding:12px;font-size:15px}.options{gap:8px;margin:0;padding:0;list-style:none;display:grid}.option{border:1px solid var(--line);border-radius:10px;align-items:center;gap:12px;min-height:52px;padding:10px 12px;line-height:1.45;display:flex}.option.correct{background:#edf4ee;border-color:#789e87}.option .tag{margin-left:auto}.option-letter{background:#f2f4ef;border:1px solid #e5e9e1;border-radius:7px;flex-shrink:0;place-items:center;width:30px;height:30px;font-size:13px;font-weight:700;display:grid}.option-fields{border:0;gap:8px;margin:0;padding:0;display:grid}.option-edit{flex-direction:column;gap:4px;display:flex}.option-edit-row{align-items:center;gap:10px;display:flex}.option-edit-row input:not([type=radio]){flex:1}.option-edit.correct .option-letter{background:var(--accent);color:#fff;border-color:var(--accent)}.option-radio{cursor:pointer;display:flex;position:relative}.option-radio input{opacity:0;width:1px;height:1px;position:absolute}.option-radio:has(input:focus-visible){outline:3px solid var(--focus);outline-offset:3px;border-radius:7px}.search{gap:8px;width:100%;display:flex}.search input{flex:1;min-width:0}.user-list{flex-direction:column;gap:10px;margin:0;padding:0;list-style:none;display:flex}.user-row{gap:12px}.user-main{flex-direction:column;gap:4px;min-width:0;display:flex}.user-email{overflow-wrap:anywhere;font-weight:700}.user-stats{grid-template-columns:repeat(3,1fr);gap:8px;margin:0;display:grid}.user-stats div{background:var(--paper);border-radius:10px;padding:8px 10px}.user-stats dt{color:var(--muted);text-transform:uppercase;letter-spacing:1px;font-size:11px}.user-stats dd{margin:2px 0 0;font-family:Manrope,sans-serif;font-weight:700}.pager{justify-content:space-between;align-items:center;gap:12px;display:flex}@media (width>=1024px){.user-row{flex-direction:row;justify-content:space-between;align-items:center}.user-stats{min-width:340px}.search{max-width:480px}}.progress-list{flex-direction:column;gap:14px;margin:0;padding:0;list-style:none;display:flex}.progress-head{justify-content:space-between;align-items:center;gap:10px;margin-bottom:6px;font-size:14px;display:flex}.bar{background:#e9ede7;border-radius:6px;height:6px;overflow:hidden}.bar span{background:var(--accent);height:100%;display:block}.attempt-group{border-top:1px solid var(--line);flex-direction:column;gap:8px;padding-top:12px;display:flex}.timeline{border-left:2px solid var(--green);flex-direction:column;gap:8px;margin:0;padding:0 0 0 14px;list-style:none;display:flex}.timeline li{flex-wrap:wrap;gap:4px 12px;font-size:14px;display:flex}.timeline-number{font-weight:700}.question-history{flex-direction:column;margin:0;padding:0;list-style:none;display:flex}.question-history li{border-top:1px solid var(--line);grid-template-columns:30px 1fr;gap:6px 12px;padding:12px 0;display:grid}.history-prompt{overflow-wrap:anywhere;font-size:14px;font-weight:700;line-height:1.5}.history-meta{flex-wrap:wrap;grid-column:2;align-items:center;gap:10px;display:flex}@media (width>=1024px){.question-history li{grid-template-columns:30px 1fr auto}.history-meta{grid-column:3}}.field{flex-direction:column;flex:1;gap:6px;min-width:0;display:flex}.field-label{font-size:13px;font-weight:600}.field-hint{color:var(--muted);font-size:12px}.field-row{gap:12px;display:flex}input:not([type=checkbox]):not([type=radio]),textarea,select{border:1px solid var(--line);background:var(--white);border-radius:10px;width:100%;min-height:48px;padding:11px 14px;font-size:16px}select{width:auto;max-width:100%}textarea{resize:vertical;line-height:1.5}.check{align-items:center;gap:10px;min-height:44px;font-size:14px;display:flex}.check input{width:20px;height:20px;accent-color:var(--accent)}form{flex-direction:column;gap:14px;display:flex}.form-error{color:var(--danger);font-size:14px;font-weight:600}.actions{flex-wrap:wrap;justify-content:flex-end;gap:10px;display:flex}.dialog{padding:22px 18px calc(22px + env(safe-area-inset-bottom));border-radius:var(--radius) var(--radius) 0 0;border:0;flex-direction:column;gap:12px;width:100%;max-width:100%;max-height:92dvh;margin:auto 0 0;display:flex;overflow-y:auto}.dialog:not([open]){display:none}.dialog::backdrop{background:#15212973}.dialog-message{color:#33423c;flex-direction:column;gap:10px;display:flex}@media (width>=720px){.dialog{border-radius:var(--radius);max-width:560px;margin:auto;padding:28px}}.state{text-align:center;color:var(--muted);padding:28px 16px}.state-error{color:var(--danger);flex-direction:column;align-items:center;gap:12px;display:flex}.login{flex-direction:column;min-height:100dvh;display:flex}.login-main{flex:1;place-items:center;padding:24px 16px;display:grid}.login-card{gap:14px;width:100%;max-width:420px;padding:24px}:root{--ease-out:cubic-bezier(.23, 1, .32, 1)}.button,.icon-button,.chip,.pressable,.nav-item,.lesson summary{transition:transform .12s var(--ease-out), background-color .15s ease, border-color .15s ease, opacity .15s ease}.button:active:not(:disabled),.icon-button:active:not(:disabled),.chip:active,.pressable:active,.nav-item:active{transform:scale(.97)}.lesson summary:active{transform:scale(.99)}.pressable:hover{border-color:#c9d2ca}.chip:hover{background:#d3e7da}@keyframes enter{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:none}}@keyframes rise{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}@keyframes sheet{0%{opacity:0;transform:translateY(24px)}to{opacity:1;transform:none}}@keyframes fade{0%{opacity:0}to{opacity:1}}@keyframes shake{0%,to{transform:translate(0)}20%,60%{transform:translate(-6px)}40%,80%{transform:translate(6px)}}@keyframes spin{to{transform:rotate(360deg)}}@keyframes pulse{0%{opacity:1}to{opacity:.45}}.enter{animation:rise .22s var(--ease-out) both}.leaving{opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;transform:scale(.97)}.dialog[open]{animation:sheet .26s var(--ease-out)}.dialog[open]::backdrop{animation:.22s ease-out fade}@media (width>=720px){.dialog[open]{animation:enter .22s var(--ease-out)}}.shake{animation:.32s ease-in-out shake}.lesson[open] .lesson-body{animation:rise .2s var(--ease-out)}.chevron{color:var(--muted);transition:transform .2s var(--ease-out);font-size:22px;line-height:1}.lesson[open] .chevron{transform:rotate(90deg)}.spinner{border:2px solid #ffffff59;border-top-color:#fff;border-radius:50%;flex-shrink:0;width:16px;height:16px;animation:.7s linear infinite spin}.secondary .spinner,.spinner.dark{border-color:#15212926;border-top-color:var(--ink)}.boot{place-items:center;min-height:100dvh;display:grid}.boot .spinner{border-width:3px;width:28px;height:28px}.field-error{color:var(--danger);animation:rise .18s var(--ease-out);font-size:13px;font-weight:600}.field.invalid input,.field.invalid textarea,.field.invalid select,.option-edit.invalid input:not([type=radio]){border-color:var(--danger);background:#fdf6f5}.toasts{z-index:50;left:12px;right:12px;top:max(12px, env(safe-area-inset-top));pointer-events:none;flex-direction:column;gap:8px;display:flex;position:fixed}.toast{pointer-events:auto;animation:enter .22s var(--ease-out);border:1px solid #0000;border-radius:14px;align-items:center;gap:12px;padding:12px 12px 12px 14px;font-size:15px;font-weight:600;line-height:1.4;transition:opacity .18s,transform .18s;display:flex;box-shadow:0 10px 30px #1521291f}.toast.leaving{opacity:0;transform:scale(.95)}.toast-success{background:var(--green);color:#28523c;border-color:#c4dccd}.toast-error{color:var(--danger);background:#fbeceb;border-color:#f0cfcb}.toast-info{background:var(--white);color:var(--ink);border-color:var(--line)}.toast-icon{background:currentColor;border-radius:50%;flex-shrink:0;place-items:center;width:24px;height:24px;font-size:13px;font-weight:800;display:grid}.toast-success .toast-icon{color:#fff;background:#28523c}.toast-error .toast-icon{background:var(--danger);color:#fff}.toast-info .toast-icon{background:var(--ink);color:#fff;font-family:Georgia,serif;font-style:italic}.toast-message{flex:1}.toast-close{width:32px;height:32px;color:inherit;opacity:.6;border-radius:8px;font-size:20px;line-height:1}.toast-close:hover{opacity:1}@media (width>=720px){.toasts{width:380px;top:24px;left:auto;right:24px}}.sk-line,.sk-option{background:#eef1ed;border-radius:8px;animation:1.2s ease-in-out infinite alternate pulse;display:block}.sk-line{height:12px}.sk-line.tall{height:20px}.sk-option{border-radius:10px;height:48px}.state-card{text-align:center;animation:rise .22s var(--ease-out);align-items:center;padding:32px 20px}.state-card p{max-width:420px}.state-icon{background:var(--green);width:44px;height:44px;color:var(--accent);border-radius:50%;place-items:center;font-size:20px;font-weight:800;display:grid}.state-error .state-icon{color:var(--danger);background:#fbeceb}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:1ms!important;animation-duration:1ms!important;animation-iteration-count:1!important}.button:active:not(:disabled),.icon-button:active:not(:disabled),.chip:active,.pressable:active,.nav-item:active{transform:none}.spinner{animation:.7s linear infinite spin!important}}
