:root{--bg:#f6f8fc;--surface:#fff;--surface-2:#eef2fa;--ink:#1d2433;--ink-2:#4a5568;--muted:#6b7489;--line:#dfe5f0;--brand:#2f5bea;--brand-ink:#fff;--brand-soft:#e8eeff;--good:#1f8a4c;--good-soft:#e3f5ea;--bad:#c43838;--bad-soft:#fdeaea;--warn:#9a6400;--warn-soft:#fff4dc;--radius:14px;--shadow:0 1px 2px #141e3c0d, 0 6px 20px #141e3c0f;--font:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}@media (prefers-color-scheme:dark){:root{--bg:#0f1420;--surface:#171e2e;--surface-2:#1f2840;--ink:#e8ecf5;--ink-2:#c3cbe0;--muted:#94a0bb;--line:#2a3450;--brand:#6f8dff;--brand-ink:#0b1020;--brand-soft:#222d52;--good:#5ccf8b;--good-soft:#17301f;--bad:#ff8080;--bad-soft:#3a1c22;--warn:#f0bf5a;--warn-soft:#3a2f16;--shadow:0 1px 2px #0000004d, 0 6px 20px #00000040;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--ink);font-family:var(--font);-webkit-font-smoothing:antialiased;font-size:16px;line-height:1.55}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3,h4{margin:0 0 .5em;line-height:1.2}h1{letter-spacing:-.02em;font-size:clamp(1.7rem,3vw,2.3rem)}h2{letter-spacing:-.01em;font-size:1.35rem}h3{font-size:1.1rem}p{margin:0 0 1em}img,video{max-width:100%}button{font:inherit}:focus-visible{outline:3px solid color-mix(in srgb, var(--brand) 55%, transparent);outline-offset:2px}.app{flex-direction:column;min-height:100vh;display:flex}.main{flex:1}.main-full{flex:1;display:flex}.container{width:100%;max-width:1120px;margin:0 auto;padding:0 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18px;font-weight:600;line-height:1.2;transition:background .15s,box-shadow .15s;display:inline-flex}.btn:hover{text-decoration:none}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-primary{background:var(--brand);color:var(--brand-ink)}.btn-primary:hover:not(:disabled){box-shadow:0 4px 14px color-mix(in srgb, var(--brand) 35%, transparent)}.btn-secondary{background:var(--surface);color:var(--ink);border-color:var(--line)}.btn-secondary:hover:not(:disabled){background:var(--surface-2)}.btn-ghost{color:var(--ink-2);background:0 0}.btn-ghost:hover:not(:disabled){background:var(--surface-2)}.btn-danger{background:var(--bad);color:#fff}.btn-danger-ghost{color:var(--bad);background:0 0}.btn-danger-ghost:hover{background:var(--bad-soft)}.btn-sm{border-radius:8px;padding:7px 12px;font-size:.9rem}.btn-lg{padding:13px 24px;font-size:1.05rem}.btn-block{width:100%}.link-button{color:var(--brand);cursor:pointer;background:0 0;border:0;padding:0;font-weight:500}.link-button:hover{text-decoration:underline}.link-button.danger{color:var(--bad)}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.form-card{flex-direction:column;gap:14px;margin-bottom:20px;padding:24px;display:flex}.form-card h2{margin:0}.field{flex-direction:column;gap:6px;display:flex}.field label{font-size:.92rem;font-weight:600}input[type=text],input[type=email],input[type=password],input:not([type]),textarea,select{font:inherit;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:10px;width:100%;padding:10px 12px}textarea{resize:vertical}input:focus,textarea:focus,select:focus{border-color:var(--brand);box-shadow:0 0 0 3px 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img{object-fit:contain;width:100%;height:100%;display:block}.course-card-top{gap:6px;min-height:0;display:flex}.course-card-top:empty{display:none}.course-card-desc{color:var(--ink-2);-webkit-line-clamp:3;-webkit-box-orient:vertical;margin:0;font-size:.92rem;display:-webkit-box;overflow:hidden}.course-card-progress{color:var(--brand);margin:0;font-size:.88rem}.course-card-meta{color:var(--muted);justify-content:space-between;gap:8px;margin-top:auto;font-size:.85rem;display:flex}.empty{text-align:center;background:var(--surface);border:1px dashed var(--line);border-radius:var(--radius);margin-top:20px;padding:56px 20px}.pager{justify-content:center;align-items:center;gap:16px;margin-top:28px;display:flex}.dropzone{border:2px dashed var(--line);border-radius:var(--radius);text-align:center;cursor:pointer;background:var(--surface-2);flex-direction:column;align-items:center;gap:6px;padding:36px 20px;transition:border-color .15s,background .15s;display:flex}.dropzone:hover,.dropzone.dragging{border-color:var(--brand);background:var(--brand-soft)}.dropzone.has-file{border-style:solid;border-color:var(--brand)}.dropzone-icon{font-size:2rem}.upload-progress{flex-direction:column;gap:6px;display:flex}.progress-panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);margin:20px 0;padding:22px}.stages{color:var(--muted);flex-wrap:wrap;gap:8px 22px;margin:0 0 14px;padding:0;font-size:.9rem;list-style:none;display:flex}.stages li{align-items:center;gap:8px;display:flex}.stages .dot{background:var(--line);border-radius:50%;width:10px;height:10px}.stages li.done{color:var(--good)}.stages li.done .dot{background:var(--good)}.stages li.active{color:var(--brand);font-weight:700}.stages li.active .dot{background:var(--brand);box-shadow:0 0 0 4px var(--brand-soft)}.progress-message{margin-bottom:10px;font-weight:600}.progress-bar{background:var(--surface-2);border-radius:4px;height:8px;margin-bottom:12px;overflow:hidden}.progress-bar>div{background:var(--brand);border-radius:4px;height:100%;transition:width .5s}.progress-bar.indeterminate>div{width:30%;animation:1.4s ease-in-out infinite slide}@keyframes slide{0%{margin-left:-30%}to{margin-left:100%}}.course-header{flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:24px;margin-bottom:20px;display:flex}.course-header>div{flex:1;min-width:280px}.course-header h1{margin-top:8px}.owner-panel{margin-bottom:20px;padding:16px 18px}.owner-actions{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:14px;display:flex}.switch{cursor:pointer;align-items:center;gap:10px;font-size:.92rem;display:flex}.switch input{opacity:0;position:absolute}.switch-track{background:var(--line);border-radius:11px;flex:none;width:40px;height:22px;transition:background .2s;position:relative}.switch-track:after{content:"";background:#fff;border-radius:50%;width:16px;height:16px;transition:left .2s;position:absolute;top:3px;left:3px}.switch input:checked+.switch-track{background:var(--good)}.switch input:checked+.switch-track:after{left:21px}.switch input:focus-visible+.switch-track{outline:3px solid var(--brand-soft)}.objectives-card{margin-bottom:24px;padding:20px 24px}.check-list{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:8px 24px;margin:0;padding:0;list-style:none;display:grid}.check-list li{padding-left:28px;position:relative}.check-list li:before{content:"✓";color:var(--good);font-weight:800;position:absolute;left:0}.module{margin-top:28px}.module-head{margin-bottom:12px}.module-num{color:var(--brand);text-transform:uppercase;letter-spacing:.06em;font-size:.8rem;font-weight:700}.module-head h2{margin:4px 0 6px}.lessons{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);margin:0;padding:0;list-style:none;overflow:hidden}.lesson+.lesson{border-top:1px solid var(--line)}.lesson-head{cursor:pointer;text-align:left;width:100%;color:var(--ink);background:0 0;border:0;align-items:center;gap:14px;padding:16px 18px;display:flex}.lesson-head:hover{background:var(--surface-2)}.lesson-num{color:var(--muted);font-variant-numeric:tabular-nums;min-width:2.2em;font-weight:600}.lesson-title{flex:1;font-weight:600}.lesson-meta{color:var(--muted);white-space:nowrap;font-size:.85rem}.chevron{border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);width:9px;height:9px;margin:0 4px;transition:transform .2s;transform:rotate(45deg)}.lesson.open .chevron{transform:rotate(225deg)}.lesson-body{padding:0 18px 20px}.objectives{color:var(--ink-2);margin:0 0 14px}.lesson-video{aspect-ratio:16/9;background:#000;border-radius:10px;width:100%}.lesson-actions{flex-wrap:wrap;gap:10px;margin:12px 0;display:flex}@media (width<=600px){.lesson-meta{display:none}}.quiz{border-top:1px dashed var(--line);text-align:left;margin-top:16px;padding-top:16px}.quiz-head{flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:12px;display:flex}.quiz-head h4{margin:0 0 8px}.quiz-question{border:0;margin:14px 0 0;padding:0}.quiz-question legend{margin-bottom:8px;padding:0;font-weight:600}.quiz-options{gap:8px;display:grid}.quiz-option{text-align:left;border:1px solid var(--line);background:var(--surface);cursor:pointer;color:var(--ink);border-radius:10px;align-items:flex-start;gap:12px;padding:10px 12px;display:flex}.quiz-option:hover:not(:disabled){border-color:var(--brand)}.quiz-option:disabled{cursor:default}.quiz-option.correct{border-color:var(--good);background:var(--good-soft)}.quiz-option.wrong{border-color:var(--bad);background:var(--bad-soft)}.quiz-option.dim{opacity:.6}.quiz-letter{color:var(--muted);min-width:1.2em;font-weight:700}.quiz-feedback{margin:8px 0 0;font-size:.92rem}.quiz-feedback.good{color:var(--good)}.quiz-feedback.bad{color:var(--bad)}.player{background:var(--bg);flex-direction:column;width:100%;min-height:100vh;display:flex}.player-loading{width:100%;padding-top:30vh}.player-bar{background:var(--surface);border-bottom:1px solid var(--line);align-items:center;gap:14px;padding:10px 16px;display:flex}.player-back{color:var(--ink);border-radius:8px;padding:2px 10px;font-size:1.4rem}.player-back:hover{background:var(--surface-2);text-decoration:none}.player-titles{flex-direction:column;flex:1;min-width:0;display:flex}.player-titles strong,.player-titles span{white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.player-titles span{color:var(--muted);font-size:.88rem}.player-body{flex:1;min-height:0;display:flex}.player-outline{border-right:1px solid var(--line);background:var(--surface);flex:none;width:300px;max-height:calc(100vh - 130px);padding:12px;overflow-y:auto}.outline-module{color:var(--muted);margin:12px 6px 6px;font-size:.85rem;font-weight:700}.outline-lesson{text-align:left;cursor:pointer;width:100%;color:var(--ink);background:0 0;border:0;border-radius:8px;padding:8px 10px;font-size:.92rem;display:block}.outline-lesson:hover{background:var(--surface-2)}.outline-lesson.current{background:var(--brand-soft);color:var(--brand);font-weight:600}.stage{flex-direction:column;flex:1;align-items:center;gap:18px;padding:28px 20px;display:flex;overflow-y:auto}.slide-card{background:var(--surface);width:100%;max-width:1040px;box-shadow:var(--shadow);border-left:10px solid var(--brand);border-radius:18px;flex-direction:column;min-height:min(62vh,580px);padding:clamp(24px,5vw,56px) clamp(22px,6vw,72px);display:flex}.slide-card h1{color:var(--ink);margin:0;font-size:clamp(1.6rem,3.6vw,2.6rem)}.slide-accent{background:var(--brand);border-radius:3px;width:90px;height:6px;margin:18px 0 24px}.slide-md{flex:1;font-size:clamp(1.05rem,2vw,1.4rem);line-height:1.55}.slide-md ul,.slide-md 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