:root{color-scheme:dark;--bg:#071019;--panel:#101b25;--line:rgba(163,191,211,.17);--muted:#8fa0ad;--text:#f5f7f8;--blue:#238be6;--green:#44d17a}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(circle at 72% 20%,#0d263b 0,transparent 35%),linear-gradient(145deg,#08131e,#050b11 70%);color:var(--text);font-family:"DM Sans",sans-serif;padding:0 28px 26px;overflow-x:hidden}.ambient{position:fixed;border-radius:50%;filter:blur(100px);opacity:.13;pointer-events:none}.ambient-one{width:420px;height:420px;background:#1689ef;right:-130px;top:15%}.ambient-two{width:300px;height:300px;background:#0b75bc;left:-160px;bottom:-60px}.topbar{height:78px;display:flex;align-items:center;justify-content:space-between;position:relative;z-index:2}.brand{display:flex;align-items:center;gap:14px}.brand-mark{display:grid;place-items:center;width:34px;height:34px;border:1px solid rgba(255,255,255,.35);border-radius:10px;font-family:Newsreader,serif;font-size:22px;background:rgba(255,255,255,.04)}.brand-name{font-family:Newsreader,serif;font-size:22px}.divider{height:22px;width:1px;background:rgba(255,255,255,.25);margin:0 3px}.section-name,.about{font-size:14px;color:#c6d0d7}.about{border:0;background:none;display:flex;align-items:center;gap:9px;cursor:pointer}.about:hover{color:white}.info-icon{display:grid;place-items:center;width:19px;height:19px;border:1px solid currentColor;border-radius:50%;font-size:12px;font-weight:700}.workspace{display:grid;grid-template-columns:300px minmax(0,1fr);gap:18px;max-width:1540px;margin:auto}.panel{background:linear-gradient(145deg,rgba(19,31,42,.94),rgba(12,21,29,.92));border:1px solid var(--line);border-radius:14px;box-shadow:0 20px 70px rgba(0,0,0,.18)}.sidebar{padding:22px;min-height:650px;display:flex;flex-direction:column}.sidebar-heading{display:flex;justify-content:space-between;align-items:center}.eyebrow{margin:0 0 6px;color:#6fa9d8;text-transform:uppercase;letter-spacing:.15em;font-size:11px;font-weight:700}.sidebar h1{font-size:19px;margin:0}.count{background:#1f3445;color:#b8c8d3;padding:4px 10px;border-radius:20px;font-size:12px}.progress-track{height:3px;background:#23323d;border-radius:4px;margin:22px 0 18px;overflow:hidden}.progress-track span{display:block;height:100%;width:0;background:linear-gradient(90deg,#2799ed,#48d487);transition:width .35s}.video-item{width:100%;border:1px solid transparent;background:transparent;color:#c0cbd3;padding:12px 11px;border-radius:9px;display:grid;grid-template-columns:28px 1fr auto;align-items:center;text-align:left;font:inherit;cursor:pointer;transition:.2s}.video-item:hover:not(:disabled){background:rgba(255,255,255,.035)}.video-item.active{background:linear-gradient(90deg,rgba(36,139,230,.18),rgba(36,139,230,.05));border-color:rgba(68,157,231,.25);color:white}.video-item:disabled{opacity:.42;cursor:not-allowed}.video-index{font-size:12px;color:#7790a2}.video-state{font-size:11px;color:#78909f}.video-item.completed .video-state{color:var(--green)}.check{width:18px;height:18px;border-radius:50%;display:grid;place-items:center;background:var(--green);color:#07150c;font-size:12px;font-weight:bold}.lock{font-size:12px}.sidebar-footer{margin-top:auto;border-top:1px solid var(--line);padding-top:18px;color:#8295a3;font-size:12px;display:flex;align-items:center;gap:8px}.dot{width:7px;height:7px;border-radius:50%;background:#2497ef;box-shadow:0 0 12px #2497ef}.content{display:flex;flex-direction:column;gap:18px}.video-shell{position:relative;overflow:hidden;min-height:430px;background:#02070b}.video-shell video{display:block;width:100%;height:100%;min-height:430px;max-height:590px;object-fit:cover;background:#03090e}.video-topline{position:absolute;z-index:2;top:0;left:0;right:0;padding:18px 20px;display:flex;justify-content:space-between;font-size:10px;letter-spacing:.16em;color:rgba(255,255,255,.65);background:linear-gradient(#0009,transparent);pointer-events:none}.loading{position:absolute;inset:0;display:flex;gap:10px;align-items:center;justify-content:center;color:#9fb0bc;background:#071019;font-size:13px}.loading.hidden{display:none}.loading span{width:18px;height:18px;border:2px solid #344b5d;border-top-color:#2f9df2;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.description-panel{padding:22px 24px}.form-copy label{font-size:17px;font-weight:600}.form-copy p{font-size:13px;color:var(--muted);margin:6px 0 16px}.textarea-wrap{border:1px solid #344653;border-radius:10px;overflow:hidden;background:rgba(2,8,13,.25);transition:.2s}.textarea-wrap:focus-within{border-color:#308ed6;box-shadow:0 0 0 3px rgba(35,139,230,.1)}textarea{display:block;width:100%;height:100px;resize:none;border:0;outline:0;background:transparent;color:white;padding:15px;font:14px/1.5 "DM Sans",sans-serif}textarea::placeholder{color:#60717d}.field-meta{display:flex;justify-content:space-between;padding:9px 13px;border-top:1px solid rgba(163,191,211,.1);font-size:11px;color:#728590}.form-actions{display:flex;align-items:center;justify-content:space-between;margin-top:15px}.hint{font-size:12px;color:#7e909c;margin:0}.save-button,.nav-button{border:0;color:white;border-radius:9px;font:600 14px "DM Sans",sans-serif;display:flex;align-items:center;gap:16px;cursor:pointer;transition:.2s}.save-button{padding:12px 18px;background:#1689df}.save-button:not(:disabled):hover,.primary:hover{background:#299cf1;transform:translateY(-1px)}button:disabled{opacity:.35;cursor:not-allowed}.navigation{max-width:1540px;margin:18px auto 0;display:grid;grid-template-columns:300px 1fr 300px;align-items:center}.nav-button{padding:16px 20px;justify-content:space-between}.nav-button span{font-size:22px}.secondary{background:#172631;border:1px solid var(--line)}.primary{background:linear-gradient(135deg,#1789e0,#0f62b9)}.position{justify-self:center;display:flex;align-items:center;gap:10px;font-size:13px;color:#78909f}.position span:first-child{color:white}.position i{width:28px;height:1px;background:#3b4a54}dialog{max-width:480px;border:1px solid #324958;border-radius:14px;padding:28px;background:#111e28;color:white;box-shadow:0 30px 100px #000}dialog::backdrop{background:rgba(2,7,11,.75);backdrop-filter:blur(4px)}dialog h2{font-family:Newsreader,serif;font-size:28px;margin:4px 0 10px}dialog>p:last-child{color:#a1b1bc;line-height:1.6}.dialog-close{position:absolute;right:15px;top:12px;border:0;background:none;color:#9babb5;font-size:24px;cursor:pointer}.toast{position:fixed;right:24px;bottom:24px;background:#eafbf1;color:#12652f;padding:13px 18px;border-radius:9px;font-size:13px;font-weight:600;transform:translateY(30px);opacity:0;transition:.3s;z-index:5}.toast.show{transform:none;opacity:1}@media(max-width:900px){body{padding:0 15px 22px}.workspace{grid-template-columns:1fr}.sidebar{min-height:auto}.sidebar nav{display:flex;gap:8px;overflow:auto;margin-top:2px}.video-item{min-width:190px}.sidebar-footer{margin-top:16px}.video-shell,.video-shell video{min-height:310px}.navigation{grid-template-columns:1fr auto 1fr;gap:10px}.navigation .nav-button{font-size:0}.navigation .nav-button span{font-size:22px}.primary{justify-content:flex-end}.brand-name{font-size:18px}.section-name,.divider{display:none}}@media(max-width:560px){.about{font-size:0}.topbar{height:66px}.video-shell,.video-shell video{min-height:230px}.description-panel{padding:18px}.form-actions{align-items:flex-end;gap:12px}.hint{max-width:170px}.save-button{font-size:12px}.navigation{margin-top:12px}.sidebar{padding:17px}}