.acs2{--bg:#f6f1e7;--panel:#fffdf8;--panel-2:#f1eadf;--ink:#24201d;--ink-2:#625b53;--ink-3:#92897f;--line:#362d261f;--line-strong:#362d2638;--orange:#f5a15c;--orange-2:#f7bd78;--blue:#78bce8;--blue-2:#d9eef9;--lilac:#a78bfa;--lilac-2:#eee7ff;--mint:#7ec9a6;--mint-2:#e3f5eb;--rose:#ef9aa8;--rose-2:#fde8ec;--yellow:#e8c76e;--yellow-2:#fbf1c9;--teal:#69bfc5;--teal-2:#ddf1f2;--sidebar:#111;--sidebar-ink:#f5f2ea}.acs2 *{box-sizing:border-box}.acs2,.acs2{background:var(--bg);min-height:100vh;color:var(--ink);margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}.acs2 button,.acs2 input{font:inherit}.acs2 button{cursor:pointer}.acs2 .app{grid-template-columns:64px minmax(0,1fr);min-height:100vh;display:grid}.acs2 .rail{background:var(--sidebar);color:var(--sidebar-ink);border-right:1px solid #ffffff0f;flex-direction:column;align-items:center;gap:14px;padding:18px 10px;display:flex}.acs2 .logo{width:38px;height:38px;color:var(--orange);background:#1b1b1b;border-radius:12px;place-items:center;font-size:21px;display:grid}.acs2 .rbtn{color:#8f8f8f;background:0 0;border:0;border-radius:10px;width:38px;height:38px}.acs2 .rbtn:hover,.acs2 .rbtn.active{color:#fff;background:#242424}.acs2 .spacer{flex:1}.acs2 .page{min-width:0}.acs2 .topbar{border-bottom:1px solid var(--line);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);z-index:10;background:#f6f1e7e6;justify-content:space-between;align-items:center;height:72px;padding:0 28px;display:flex;position:sticky;top:0}.acs2 .top-left,.acs2 .top-right{align-items:center;gap:12px;display:flex}.acs2 .back,.acs2 .pill{border:1px solid var(--line);color:var(--ink-2);background:#ffffff9e;border-radius:999px;padding:9px 14px}.acs2 .back:hover,.acs2 .pill:hover{border-color:var(--line-strong);color:var(--ink);background:#fff}.acs2 .crumb{color:var(--ink-2);font-size:14px}.acs2 .main{grid-template-columns:minmax(0,1fr) 390px;gap:24px;padding:26px 28px 38px;display:grid}.acs2 .stage-col{min-width:0}.acs2 .stage-shell{background:var(--panel);border:1px solid var(--line);border-radius:24px;overflow:hidden;box-shadow:0 18px 45px #3d2d1e14}.acs2 .stage-toolbar{border-bottom:1px solid var(--line);background:#ffffffc7;justify-content:space-between;align-items:center;height:52px;padding:0 16px;display:flex}.acs2 .toolbar-left,.acs2 .toolbar-right{align-items:center;gap:8px;display:flex}.acs2 .toolbtn{border:1px solid var(--line);color:var(--ink-2);background:#fff;border-radius:10px;height:34px;padding:0 11px;font-size:12px}.acs2 .toolbtn:hover{border-color:var(--line-strong);color:var(--ink)}.acs2 .lesson-stage{aspect-ratio:16/9;background:radial-gradient(800px 480px at 88% 2%,#78bce830,#0000 48%),radial-gradient(700px 520px at 4% 100%,#f5a15c29,#0000 50%),#fffaf1;min-height:520px;position:relative;overflow:hidden}.acs2 .lesson-stage.fullscreen{aspect-ratio:auto;border-radius:0;min-height:100vh}.acs2 .stage-head{z-index:3;justify-content:space-between;align-items:flex-start;display:flex;position:absolute;top:22px;left:28px;right:28px}.acs2 .tag{border-radius:999px;align-items:center;gap:6px;margin-bottom:9px;padding:6px 11px;font-size:12px;font-weight:650;display:inline-flex}.acs2 .tag.micro{background:var(--lilac-2);color:#7053cc}.acs2 .tag.video{background:var(--blue-2);color:#337cad}.acs2 .tag.lab{background:var(--mint-2);color:#3c8866}.acs2 .tag.quiz{background:var(--yellow-2);color:#876d20}.acs2 .stage-title{letter-spacing:-.025em;margin:0;font-size:27px;font-weight:700;line-height:1.2}.acs2 .stage-sub{color:var(--ink-2);margin-top:8px;font-size:14px}.acs2 .mode-badge{border:1px solid var(--line);color:var(--ink-2);background:#ffffffc2;border-radius:999px;padding:7px 10px;font-size:12px}.acs2 .micro-wrap{grid-template-columns:minmax(0,1.42fr) minmax(270px,.58fr);gap:18px;display:grid;position:absolute;inset:112px 26px 72px}.acs2 .viz{border:1px solid var(--line);background:#ffffffbf;border-radius:20px;padding:22px;position:relative;overflow:hidden}.acs2 .viz:before{content:"";pointer-events:none;background:linear-gradient(135deg,#a78bfa14,#0000 38%),linear-gradient(315deg,#7ec9a614,#0000 34%);position:absolute;inset:0}.acs2 .viz-title{color:var(--ink-3);margin-bottom:16px;font-size:13px;position:relative}.acs2 .tokens{grid-template-columns:repeat(6,1fr);align-items:center;gap:10px;margin:18px 0 4px;display:grid;position:relative}.acs2 .token{border:1px solid var(--line);height:52px;color:var(--ink-2);background:#fff;border-radius:13px;place-items:center;display:grid;box-shadow:0 3px 10px #281e140a}.acs2 .token.active{color:#fff;background:linear-gradient(160deg,#9977f6,#7357db);border-color:#8467e8;box-shadow:0 10px 25px #6f54db38}.acs2 .lines{height:125px;margin-top:-2px;position:relative}.acs2 .lines svg{width:100%;height:100%}.acs2 .weights{grid-template-columns:repeat(6,1fr);gap:10px;margin-top:8px;display:grid}.acs2 .w{border:1px solid var(--line);height:34px;color:var(--ink-3);background:#fff;border-radius:9px;place-items:center;font-size:12px;display:grid}.acs2 .w:first-child{background:var(--blue-2);color:#377fa9}.acs2 .w:nth-child(2){background:var(--mint-2);color:#3b8565}.acs2 .w:nth-child(4){background:var(--rose-2);color:#a95c69}.acs2 .w:nth-child(5){background:var(--yellow-2);color:#826a21}.acs2 .w:nth-child(6){background:var(--teal-2);color:#3c8589}.acs2 .w.active{color:#6e4ed2;background:var(--lilac-2);border-color:#c9b9fb;font-weight:700}.acs2 .sliderbox{border:1px solid var(--line);background:#fff;border-radius:14px;margin-top:16px;padding:14px 16px;position:relative}.acs2 .sliderrow{color:var(--ink-3);justify-content:space-between;margin-bottom:7px;font-size:12px;display:flex}.acs2 input[type=range]{accent-color:#8c6ee7;width:100%}.acs2 .explain{border:1px solid var(--line);background:#ffffffdb;border-radius:20px;flex-direction:column;gap:13px;padding:20px;display:flex;overflow:auto}.acs2 .halo{background:radial-gradient(circle,#fff 0 17%,#ffd398 28%,#f5a15c54 50%,#78bce833 67%,#0000 72%);border-radius:50%;width:42px;height:42px;box-shadow:0 0 30px #f5a15c38}.acs2 .explain h3{margin:0;font-size:17px}.acs2 .explain p{color:var(--ink-2);margin:0;font-size:14px;line-height:1.7}.acs2 .callout{background:linear-gradient(135deg,var(--blue-2),#eee7ffc7);color:#4b5870;border:1px solid #78bce859;border-radius:13px;padding:13px;font-size:13px;line-height:1.6}.acs2 .stage-footer{border-top:1px solid var(--line);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#fffdf8eb;justify-content:space-between;align-items:center;height:58px;padding:0 20px;display:flex;position:absolute;bottom:0;left:0;right:0}.acs2 .step{color:var(--ink-2);font-size:13px}.acs2 .next{color:#1f2a34;background:var(--blue);border:0;border-radius:12px;padding:10px 16px;font-weight:700;box-shadow:0 6px 18px #5297c533}.acs2 .next:hover{filter:brightness(.98)}.acs2 .video-stage{color:#fff;background:#0b0b0c;display:none;position:absolute;inset:0}.acs2 .video-stage .video-inner{background:radial-gradient(circle at 70% 30%,#78bce829,#0000 35%),radial-gradient(circle at 30% 70%,#a78bfa24,#0000 30%),#09090a;justify-content:center;align-items:center;display:flex;position:absolute;inset:0}.acs2 .play{color:#161616;background:#fff;border:0;border-radius:50%;width:74px;height:74px;font-size:28px;box-shadow:0 8px 26px #0000004d}.acs2 .video-caption{color:#d6d6d6;font-size:13px;position:absolute;bottom:22px;left:24px}.acs2 .video-controls{background:#ffffff40;border-radius:99px;height:4px;position:absolute;bottom:14px;left:20px;right:20px}.acs2 .video-controls span{background:var(--orange);border-radius:99px;width:38%;height:100%;display:block}.acs2 .video-mode .micro-wrap,.acs2 .video-mode .stage-head,.acs2 .video-mode .stage-footer{display:none}.acs2 .video-mode .video-stage{display:block}.acs2 .prompt{border:1px solid var(--line);background:#ffffffb8;border-radius:18px;align-items:center;gap:10px;margin-top:14px;padding:10px 12px;display:flex;box-shadow:0 9px 25px #3d2d1e0d}.acs2 .prompt input{min-width:0;color:var(--ink);background:0 0;border:0;outline:0;flex:1;font-size:14px}.acs2 .prompt-tools{align-items:center;gap:6px;display:flex}.acs2 .prompt-chip{border:1px solid var(--line);color:var(--ink-2);background:#fff;border-radius:999px;padding:7px 10px;font-size:12px}.acs2 .send{background:var(--orange);color:#24160c;border:0;border-radius:50%;width:38px;height:38px;font-weight:700}.acs2 .course-meta{margin-top:24px;padding:4px 4px 0}.acs2 .eyebrow{letter-spacing:.16em;color:var(--ink-3);font-size:11px}.acs2 .course-meta h1{margin:8px 0 10px;font-family:Georgia,serif;font-size:36px;font-weight:400;line-height:1.15}.acs2 .meta-row{flex-wrap:wrap;gap:8px;display:flex}.acs2 .meta-chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:6px 10px;font-size:12px}.acs2 .meta-chip.micro{background:var(--lilac-2);color:#6e54c6;border-color:#d8ccfb}.acs2 .meta-chip.video{background:var(--blue-2);color:#377fa9;border-color:#c3e3f4}.acs2 .meta-chip.lab{background:var(--mint-2);color:#3d8466;border-color:#ccebdc}.acs2 .meta-chip.quiz{background:var(--yellow-2);color:#856c22;border-color:#efe0a6}.acs2 .playlist{border:1px solid var(--line);background:#ffffffad;border-radius:22px;padding:16px;position:sticky;top:96px;box-shadow:0 16px 40px #3d2d1e0f}.acs2 .playlist-head{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;padding:4px 2px 14px;display:flex}.acs2 .playlist-head h2{margin:0;font-size:18px}.acs2 .playlist-head span{color:var(--ink-3);font-size:12px}.acs2 .lesson-list{flex-direction:column;gap:4px;margin-top:8px;display:flex}.acs2 .lesson{cursor:pointer;border-radius:14px;grid-template-columns:104px minmax(0,1fr) auto;align-items:center;gap:11px;padding:9px;display:grid}.acs2 .lesson:hover{background:#ffffffc2}.acs2 .lesson.active{border:1px solid var(--line);background:#fff;box-shadow:0 7px 20px #3d2d1e0f}.acs2 .thumb{border:1px solid #32281e14;border-radius:11px;height:62px;position:relative;overflow:hidden}.acs2 .thumb.video{background:linear-gradient(135deg,#3a2c50,#7d66ba)}.acs2 .thumb.micro{background:linear-gradient(135deg,#d9eef9,#eee7ff)}.acs2 .thumb.lab{background:linear-gradient(135deg,#e3f5eb,#ddf1f2)}.acs2 .thumb.quiz{background:linear-gradient(135deg,#fbf1c9,#fde8ec)}.acs2 .thumb.video:not(.has-cover):after{content:"▶";color:#ffffff9e;place-items:center;font-size:19px;display:grid;position:absolute;inset:0}.acs2 .thumb .type-dot{color:#444;background:#ffffffdb;border-radius:999px;padding:3px 6px;font-size:10px;position:absolute;top:8px;left:8px}.acs2 .thumb .dur{color:#fff;background:#141414b8;border-radius:5px;padding:2px 5px;font-size:10px;position:absolute;bottom:5px;right:6px}.acs2 .thumb.micro:not(.has-cover):after{content:"↗  ↘  →";color:#7357db;letter-spacing:5px;place-items:center;font-weight:800;display:grid;position:absolute;inset:0}.acs2 .thumb.lab:not(.has-cover):after{content:"◌  ◉";color:#3c8866;place-items:center;font-size:20px;display:grid;position:absolute;inset:0}.acs2 .thumb.quiz:not(.has-cover):after{content:"A  B  C";color:#8a6d20;letter-spacing:6px;place-items:center;font-size:15px;display:grid;position:absolute;inset:0}.acs2 .ltitle{color:var(--ink);font-size:13px;line-height:1.35}.acs2 .ltype{color:var(--ink-3);margin-top:4px;font-size:11px}.acs2 .index{color:var(--ink-3);font-size:12px}.acs2 .progress{border-top:1px solid var(--line);margin-top:14px;padding:14px 2px 2px}.acs2 .bar{background:#e9e0d5;border-radius:99px;height:7px;overflow:hidden}.acs2 .bar>span{background:var(--orange);border-radius:99px;width:32%;height:100%;display:block}.acs2 .small{color:var(--ink-3);justify-content:space-between;margin-top:8px;font-size:12px;display:flex}.acs2 .theater .main{grid-template-columns:1fr}.acs2 .theater .playlist{margin-top:0;position:static}.acs2 .theater .playlist .lesson-list{grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.acs2 .followup-section{margin-top:14px}.acs2 .followup-head{justify-content:space-between;align-items:center;margin-bottom:9px;padding:0 2px;display:flex}.acs2 .followup-head b{color:var(--ink);font-size:13px}.acs2 .followup-head span{color:var(--ink-3);font-size:11px}.acs2 .followup-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;display:grid}.acs2 .followup-card{border:1px solid var(--line);text-align:left;min-height:92px;color:var(--ink);background:#ffffffb8;border-radius:16px;flex-direction:column;justify-content:space-between;padding:14px;transition:all .16s;display:flex}.acs2 .followup-card:hover{border-color:var(--line-strong);background:#fff;transform:translateY(-2px);box-shadow:0 10px 24px #3d2d1e12}.acs2 .followup-card .ic{border-radius:10px;place-items:center;width:29px;height:29px;font-size:13px;font-weight:800;display:grid}.acs2 .followup-card b{margin-top:11px;font-size:13px;line-height:1.4}.acs2 .followup-card small{color:var(--ink-3);margin-top:5px;font-size:10.5px}.acs2 .followup-card:first-child .ic{background:var(--blue-2);color:#337cad}.acs2 .followup-card:nth-child(2) .ic{background:var(--lilac-2);color:#7053cc}.acs2 .followup-card:nth-child(3) .ic{background:var(--mint-2);color:#3c8866}.acs2 .followup-card:nth-child(4) .ic{background:var(--rose-2);color:#a95c69}.acs2 .comments{border-top:1px solid var(--line);margin-top:30px;padding-top:22px}.acs2 .comments-head{justify-content:space-between;align-items:center;margin-bottom:16px;display:flex}.acs2 .comments-head h3{margin:0;font-size:18px}.acs2 .comments-head span{color:var(--ink-3);font-size:12px}.acs2 .comment-compose{grid-template-columns:38px minmax(0,1fr) auto;align-items:center;gap:10px;margin-bottom:18px;display:grid}.acs2 .avatar{background:linear-gradient(135deg,var(--blue),var(--lilac));color:#fff;border-radius:50%;place-items:center;width:38px;height:38px;font-size:12px;font-weight:700;display:grid}.acs2 .comment-compose input{border:1px solid var(--line);height:42px;color:var(--ink);background:#ffffffc2;border-radius:999px;outline:none;padding:0 16px}.acs2 .comment-compose input:focus{border-color:var(--line-strong);background:#fff}.acs2 .comment-submit{background:var(--orange);color:#2d1b0d;border:0;border-radius:999px;height:40px;padding:0 16px;font-weight:700}.acs2 .comment-row{border-bottom:1px solid var(--line);grid-template-columns:38px minmax(0,1fr);gap:11px;padding:15px 0;display:grid}.acs2 .comment-row:last-child{border-bottom:0}.acs2 .comment-row:nth-child(3) .avatar{background:linear-gradient(135deg,var(--mint),var(--teal))}.acs2 .comment-row:nth-child(4) .avatar{background:linear-gradient(135deg,var(--rose),var(--orange))}.acs2 .comment-top{align-items:center;gap:9px;display:flex}.acs2 .comment-top b{font-size:13px}.acs2 .comment-top span{color:var(--ink-3);font-size:10.5px}.acs2 .comment-text{color:var(--ink-2);margin-top:5px;font-size:13.5px;line-height:1.65}.acs2 .comment-actions{gap:14px;margin-top:8px;display:flex}.acs2 .comment-actions button{color:var(--ink-3);background:0 0;border:0;padding:0;font-size:11px}.acs2 .progress{border-top:1px solid var(--line);background:0 0;margin-top:16px;padding:16px 2px 4px}.acs2 .progress .bar{height:5px;box-shadow:none;background:#e8e1d7;border-radius:999px;overflow:hidden}.acs2 .progress .bar>span{width:32%;height:100%;box-shadow:none;border-radius:999px;display:block;background:var(--orange)!important}.acs2 .progress .small{color:var(--ink-3);justify-content:space-between;align-items:center;margin-top:8px;font-size:11px;display:flex}.acs2 .progress .small span:last-child{color:var(--ink-2);font-weight:600}.acs2 .mode-badge{border-color:var(--line);color:var(--ink-2);background:#fff}.acs2 .stage-footer{background:#fffdf8f0}.acs2 .step{color:var(--ink-2)}.acs2 .course-meta .meta-row{gap:7px}.acs2 .course-meta .meta-chip,.acs2 .course-meta .meta-chip.micro,.acs2 .course-meta .meta-chip.video,.acs2 .course-meta .meta-chip.lab,.acs2 .course-meta .meta-chip.quiz{color:var(--ink-2);border-color:var(--line);background:#fff}.acs2 .lesson.active{box-shadow:none;background:#fffaf3;border:1px solid #f5a15c38;position:relative}.acs2 .lesson.active:before{content:"";background:var(--orange);border-radius:0 99px 99px 0;width:3px;position:absolute;top:12px;bottom:12px;left:0}.acs2 .thumb .type-dot{color:var(--ink-2);border:1px solid var(--line);background:#ffffffe6}.acs2 .lang-select{appearance:none;background:linear-gradient(45deg,transparent 50%,var(--ink-3) 50%) calc(100% - 15px) 50%/5px 5px no-repeat, linear-gradient(135deg,var(--ink-3) 50%,transparent 50%) calc(100% - 10px) 50%/5px 5px no-repeat, #ffffff9e;padding-right:34px}.acs2 .stage-footer{justify-content:flex-end}.acs2 .followup-section{visibility:visible!important;opacity:1!important;margin-top:18px!important;display:block!important}.acs2 .followup-head{margin-bottom:12px!important}.acs2 .followup-head b{font-size:15px!important}.acs2 .course-meta .eyebrow{letter-spacing:.15em;color:var(--ink-3);font-size:11px}.acs2 .home-prompt{border:1px solid var(--line);min-height:76px;box-shadow:none;background:#fffdf8;border-radius:20px;grid-template-columns:46px minmax(0,1fr) 46px;align-items:center;gap:10px;margin-top:14px;padding:12px 14px;display:grid}.acs2 .home-prompt input{width:100%;min-width:0;color:var(--ink);background:0 0;border:0;outline:0;font-size:14px;line-height:1.45}.acs2 .home-prompt input::placeholder{color:var(--ink-3)}.acs2 .home-plus,.acs2 .home-send{border-radius:50%;place-items:center;width:42px;height:42px;font-size:22px;line-height:1;display:grid}.acs2 .home-plus{border:1px solid var(--line);color:#fff;background:#1f1f1f}.acs2 .home-plus:hover{background:#2a2a2a}.acs2 .home-send{background:var(--orange);color:#1d130b;border:0;font-weight:700}.acs2 .home-send:hover{filter:brightness(.98)}.acs2 .home-prompt{grid-template-columns:48px minmax(0,1fr) 48px;width:calc(100% + 56px);max-width:none;min-height:88px;margin-left:-28px;margin-right:-28px;padding:14px 16px}.acs2 .home-prompt input{font-size:15px}.acs2 .micro-wrap{align-items:start}.acs2 .viz{align-self:start!important;height:auto!important;min-height:0!important;overflow:visible!important}.acs2 .home-prompt{align-items:center;width:100%!important;min-height:76px!important;margin-left:0!important;margin-right:0!important;padding:20px 18px!important}.acs2 .home-prompt 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