@import 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#0b2a4d1f;--vu-text-primary:var(--vu-neutral-800);--vu-text-secondary:var(--vu-neutral-600);--vu-text-muted:var(--vu-neutral-500);--vu-text-inverse:var(--vu-neutral-0);--vu-surface-canvas:var(--vu-neutral-0);--vu-surface-subtle:var(--vu-neutral-100);--vu-surface-card:var(--vu-neutral-0);--vu-surface-brand:var(--vu-blue-700);--vu-surface-brand-hover:var(--vu-blue-800);--vu-border-subtle:var(--vu-neutral-200);--vu-border-default:var(--vu-neutral-300)}.theme-dark{--vu-text-primary:var(--vu-neutral-0);--vu-text-secondary:var(--vu-neutral-300);--vu-text-muted:var(--vu-neutral-400);--vu-surface-canvas:var(--vu-neutral-900);--vu-surface-subtle:#22262a;--vu-surface-card:#25292d;--vu-surface-brand:var(--vu-blue-500);--vu-surface-brand-hover:var(--vu-blue-400);--vu-border-subtle:#34393e;--vu-border-default:#4a5158}:root{font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:Be Vietnam Pro,Segoe UI,sans-serif}html,body,#root{min-height:100%;margin:0}body{min-width:320px}*{box-sizing:border-box}button,input{font:inherit}button{color:inherit;cursor:pointer}button:disabled{cursor:not-allowed;opacity:.58}button:focus-visible{outline:3px solid color-mix(in srgb, var(--vu-blue-500) 45%, transparent);outline-offset:2px}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;padding:0;position:absolute;overflow:hidden}.app{--navy:var(--vu-blue-700);--navy-dark:var(--vu-blue-900);--red:var(--vu-red-700);--red-dark:var(--vu-red-800);--blue:var(--vu-blue-600);--bg:var(--vu-neutral-50);--surface:var(--vu-surface-card);--surface-soft:var(--vu-surface-subtle);--text:var(--vu-text-primary);--muted:var(--vu-text-secondary);--border:var(--vu-border-subtle);--ice:var(--vu-blue-50);--success:var(--vu-green-700);min-height:100dvh;color:var(--text);background:var(--bg);transition:color .2s,background .2s}.theme-dark{--bg:var(--vu-surface-canvas);--surface:var(--vu-surface-card);--surface-soft:var(--vu-surface-subtle);--text:var(--vu-text-primary);--muted:var(--vu-text-secondary);--border:var(--vu-border-subtle);--ice:var(--vu-blue-900);--navy:var(--vu-blue-300);--navy-dark:var(--vu-blue-200);--red:var(--vu-red-500);--red-dark:var(--vu-red-700);--success:var(--vu-green-700)}.site-header{z-index:50;background:var(--surface);border-bottom:1px solid var(--border);height:76px;box-shadow:0 2px 8px var(--vu-shadow-header);position:sticky;top:0}.header-inner{align-items:stretch;gap:36px;max-width:1480px;height:100%;margin:auto;padding:0 30px;display:flex}.brand-lockup{flex:none;align-items:center;width:145px;display:inline-flex}.brand-lockup img{width:145px;height:auto;display:block}.brand-white{display:none!important}.theme-dark .brand-color{display:none}.theme-dark .brand-white{display:block!important}.desktop-nav{align-items:stretch;gap:4px;height:100%;display:flex}.header-link{color:var(--muted);cursor:pointer;background:0 0;border:0;align-items:center;gap:8px;padding:0 17px;font-size:14px;font-weight:600;display:flex;position:relative}.header-link:after{content:"";background:var(--red);height:3px;transition:transform .2s;position:absolute;inset:auto 15px 0;transform:scaleX(0)}.header-link:hover,.header-link.active{color:var(--navy)}.header-link:hover:after,.header-link.active:after{transform:scaleX(1)}.header-actions{align-items:center;gap:9px;margin-left:auto;display:flex;position:relative}.utility-button,.menu-button{width:40px;height:40px;color:var(--muted);background:var(--surface-soft);border:1px solid var(--border);cursor:pointer;border-radius:8px;place-items:center;display:grid;position:relative}.utility-button:hover{color:var(--navy);border-color:var(--navy)}.utility-button i{background:var(--red);border:2px solid var(--surface);border-radius:50%;width:6px;height:6px;position:absolute;top:8px;right:8px}.account-button{border:1px solid var(--border);cursor:pointer;background:0 0;border-radius:22px;align-items:center;gap:8px;height:42px;padding:0 12px 0 5px;display:flex}.account-button>span{color:#fff;background:var(--navy);border-radius:50%;place-items:center;width:31px;height:31px;font-size:10px;font-weight:800;display:grid}.account-button small{text-overflow:ellipsis;white-space:nowrap;max-width:90px;color:var(--text);font-size:12px;font-weight:700;overflow:hidden}.menu-button{color:#fff;background:var(--navy);border-color:var(--navy);display:none}.header-popover{z-index:80;width:min(330px,100vw - 30px);color:var(--text);background:var(--surface);border:1px solid var(--border);border-radius:var(--vu-radius-lg);box-shadow:var(--vu-shadow-md);padding:14px;position:absolute;top:calc(100% + 12px);right:0}.header-popover>div{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding-bottom:10px;display:flex}.header-popover h2{color:var(--navy-dark);font:700 var(--vu-text-sm)/1.3 var(--vu-font-brand);margin:0}.header-popover>div button{width:30px;height:30px;color:var(--muted);background:var(--surface-soft);border-radius:var(--vu-radius-md);cursor:pointer;border:0;place-items:center;display:grid}.header-popover p{border-bottom:1px solid var(--border);margin:0;padding:11px 2px}.header-popover p:last-child{border-bottom:0;padding-bottom:2px}.header-popover p strong,.header-popover p span{display:block}.header-popover p strong{font-size:var(--vu-text-xs)}.header-popover p span{color:var(--muted);font-size:var(--vu-text-2xs);margin-top:3px}.account-popover{right:0}.mobile-drawer{z-index:70;background:var(--surface);width:min(400px,100%);box-shadow:-20px 0 50px var(--vu-shadow-drawer);padding:18px;transition:transform .25s;position:fixed;inset:0 0 0 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button{min-height:46px;color:var(--text);background:var(--surface-soft);border:1px solid var(--border);border-radius:var(--vu-radius-md);text-align:left;align-items:center;gap:12px;padding:11px 15px;display:flex}.live-banner{color:#fff;background:linear-gradient(105deg, var(--vu-blue-900), var(--vu-blue-700) 58%, var(--vu-blue-600));border-bottom:3px solid var(--red);justify-content:space-between;align-items:center;gap:18px;min-height:66px;padding:12px max(30px,50vw - 710px);display:flex}.live-banner>div{align-items:center;gap:12px;display:flex}.live-icon{color:#fff;background:var(--vu-alpha-white-10);border:1px solid var(--vu-alpha-white-19);border-radius:9px;place-items:center;width:38px;height:38px;display:grid}.live-banner small,.live-banner strong{display:block}.live-banner small{color:var(--vu-live-blue-label);font-family:var(--vu-font-brand);letter-spacing:0;font-size:10px;font-weight:800}.live-banner strong{margin-top:3px;font-size:14px}.sync-pill{color:var(--vu-live-green-pale);background:var(--vu-alpha-white-7);border:1px solid var(--vu-alpha-white-15);border-radius:999px;align-items:center;gap:8px;padding:7px 11px;font-size:10px;font-weight:700;display:flex}.sync-pill i{background:var(--vu-live-green);width:7px;height:7px;box-shadow:0 0 0 4px var(--vu-live-green-alpha);border-radius:50%;animation:1.6s infinite live-pulse}.live-statuses{align-items:center;gap:8px;display:flex}.resume-pill{color:var(--vu-blue-100);background:var(--vu-alpha-white-7);border:1px solid var(--vu-alpha-white-15);border-radius:var(--vu-radius-pill);font-size:var(--vu-text-2xs);align-items:center;gap:6px;padding:7px 10px;font-weight:700;display:flex}@keyframes live-pulse{50%{box-shadow:0 0 0 7px var(--vu-live-green-transparent)}}.page-shell{grid-template-columns:230px minmax(0,1fr) minmax(360px,420px);align-items:start;gap:22px;max-width:1480px;margin:auto;padding:28px 30px 42px;display:grid}.lesson-rail,.transcript-card,.info-card,.discussion-card,.session-progress{background:var(--surface);border:1px solid var(--border);box-shadow:0 5px 18px var(--vu-shadow-card);border-radius:12px}.lesson-rail{position:sticky;top:102px;overflow:hidden}.rail-heading{color:var(--muted);border-bottom:1px solid var(--border);font-family:var(--vu-font-brand);letter-spacing:0;justify-content:space-between;padding:16px 17px 12px;font-size:9px;font-weight:800;display:flex}.rail-heading strong{color:var(--navy)}.lesson-list{padding:9px}.rail-topic{border-bottom:1px solid color-mix(in srgb, var(--border) 70%, transparent);padding:7px 0 10px}.rail-topic:last-child{border-bottom:0}.rail-topic-title{width:100%;color:var(--navy);font-family:var(--vu-font-brand);text-align:left;cursor:pointer;background:0 0;border:0;grid-template-columns:34px 1fr 18px;align-items:start;gap:10px;padding:12px 9px 9px;display:grid}.rail-topic-title:hover{background:color-mix(in srgb, var(--ice) 60%, transparent)}.rail-topic-title span{color:var(--red);font-size:14px;font-weight:900}.rail-topic-title strong{font-size:14px;line-height:1.35}.rail-topic-title svg{color:var(--muted);transition:transform .16s;transform:rotate(0)}.rail-topic.expanded .rail-topic-title svg{color:var(--red);transform:rotate(90deg)}.lesson-item{width:100%;min-height:54px;color:var(--text);text-align:left;cursor:pointer;background:0 0;border:0;border-radius:9px;align-items:center;gap:10px;padding:8px 9px 8px 18px;display:flex}.lesson-item:hover{background:var(--surface-soft)}.lesson-item:disabled:hover{background:0 0}.lesson-item.locked{color:var(--muted)}.lesson-item.active{background:var(--ice);box-shadow:inset 3px 0 var(--red)}.lesson-item.selected{outline:2px solid color-mix(in srgb, var(--navy) 28%, transparent);outline-offset:-2px}.lesson-index{width:20px;height:20px;color:color-mix(in srgb, var(--muted) 72%, transparent);background:0 0;border:0;border-radius:999px;flex:none;place-items:center;font-size:10px;font-weight:800;display:grid}.kc-completion-icon{width:19px;height:19px;color:color-mix(in srgb, var(--muted) 58%, transparent);border:2px solid color-mix(in srgb, var(--muted) 42%, transparent);background:0 0;border-radius:999px;flex:none;place-items:center;display:grid}.lesson-item.done .kc-completion-icon{color:#fff;background:var(--success);border-color:var(--success)}.lesson-item.done .kc-completion-icon svg{display:block}.lesson-item.active .kc-completion-icon{border-color:color-mix(in srgb, var(--navy) 42%, transparent)}.lesson-item.done.active .kc-completion-icon{background:var(--success);border-color:var(--success);box-shadow:0 0 0 3px color-mix(in srgb, var(--success) 18%, transparent)}.lesson-item>span:nth-child(2){flex:1;min-width:0}.lesson-item strong,.lesson-item small{text-overflow:ellipsis;white-space:nowrap;display:block;overflow:hidden}.lesson-item strong{font-size:10px}.lesson-item small{color:var(--muted);margin-top:4px;font-size:8px}.lesson-item>svg{color:var(--red)}.day-progress{background:var(--surface-soft);border-top:1px solid var(--border);padding:15px 17px 17px}.day-progress>div:first-child{color:var(--muted);justify-content:space-between;font-size:9px;font-weight:800;display:flex}.day-progress strong{color:var(--navy)}.progress-track{background:var(--border);border-radius:6px;height:6px;margin:10px 0 7px;overflow:hidden}.progress-track i{background:linear-gradient(90deg, var(--navy), var(--blue));height:100%;transition:width .4s;display:block}.day-progress small{color:var(--muted);font-size:9px}.learning-column{min-width:0}.lesson-hero{justify-content:space-between;align-items:flex-end;gap:22px;min-height:104px;padding:4px 2px 21px;display:flex}.lesson-actions{flex:none;align-items:center;gap:10px;display:flex}.eyebrow{color:var(--red);font-family:var(--vu-font-brand);letter-spacing:0;align-items:center;gap:7px;margin-bottom:9px;font-size:10px;font-weight:800;display:flex}.eyebrow>span{color:var(--vu-amber-700);background:var(--vu-amber-50);border-radius:var(--vu-radius-sm);letter-spacing:0;padding:4px 7px;font-size:8px}.hero-copy h1{color:var(--navy-dark);font-family:var(--vu-font-brand);letter-spacing:0;margin:0;font-size:34px;line-height:1.15}.theme-dark .hero-copy h1{color:var(--text)}.hero-copy p{max-width:660px;color:var(--muted);margin:9px 0 0;font-size:13px;line-height:1.55}.prerequisite-chip{color:var(--navy-dark);background:var(--ice);border:1px solid var(--vu-blue-100);border-radius:var(--vu-radius-pill);align-items:center;gap:6px;margin-top:10px;padding:6px 9px;font-size:9px;display:inline-flex}.prerequisite-chip strong{color:var(--success);margin-left:3px}.primary-button{color:#fff;background:var(--red);min-width:139px;height:44px;box-shadow:0 8px 20px color-mix(in srgb, var(--red) 20%, transparent);cursor:pointer;border:0;border-radius:8px;justify-content:center;align-items:center;gap:8px;padding:0 18px;font-size:12px;font-weight:800;display:flex}.primary-button:hover{background:var(--red-dark);transform:translateY(-1px)}.primary-button.started{background:var(--success);box-shadow:none}.voice-button{height:44px;color:var(--navy);background:var(--surface);border:1px solid var(--vu-blue-200);box-shadow:var(--vu-shadow-xs);white-space:nowrap;border-radius:8px;justify-content:center;align-items:center;gap:7px;padding:0 13px;font-size:11px;font-weight:800;display:inline-flex}.voice-button:hover,.voice-button.active{color:#fff;background:var(--navy);border-color:var(--navy)}.session-progress{margin-bottom:13px;padding:13px 15px}.session-progress>div:first-child{color:var(--muted);justify-content:space-between;margin-bottom:9px;font-size:9px;font-weight:800;display:flex}.session-progress strong{color:var(--navy)}.segments{grid-template-columns:repeat(3,1fr);gap:6px;display:grid}.segments i{background:var(--border);border-radius:6px;height:5px}.segments .done{background:var(--success)}.segments .active{background:var(--navy)}.lecture-stage{color:#fff;background:radial-gradient(circle at 82% 0, var(--vu-live-glow), transparent 27%), linear-gradient(120deg, var(--vu-blue-900), var(--vu-blue-700) 60%, var(--vu-blue-600));min-height:116px;box-shadow:0 12px 28px var(--vu-shadow-stage);border-radius:12px;flex-direction:column;gap:16px;margin-bottom:13px;padding:22px 24px;display:flex;position:relative;overflow:hidden}.lecture-stage-top{justify-content:space-between;align-items:center;gap:12px;display:flex}.teacher-presence{align-items:center;gap:15px;display:flex}.teacher-avatar{background:var(--vu-alpha-white-11);border:1px solid var(--vu-alpha-white-21);border-radius:11px;place-items:center;width:52px;height:52px;display:grid;position:relative}.teacher-avatar.speaking{color:var(--vu-live-green-pale);border-color:var(--vu-live-green-bright);box-shadow:0 0 0 4px var(--vu-live-green-alpha)}.teacher-avatar.speaking:after{border-color:var(--vu-live-green-bright)}@keyframes teacher-pulse{50%{opacity:.2;transform:scale(1.1)}}.teacher-presence small,.teacher-presence strong,.teacher-presence em{display:block}.teacher-presence small{color:var(--vu-live-blue-label-strong);font-family:var(--vu-font-brand);letter-spacing:0;font-size:9px;font-style:normal;font-weight:800}.teacher-presence strong{font-family:var(--vu-font-brand);margin:4px 0;font-size:16px}.teacher-presence em{color:var(--vu-live-blue-copy);font-size:9px;font-style:normal}.stage-status{background:var(--vu-alpha-white-8);border:1px solid var(--vu-alpha-white-15);border-radius:999px;align-items:center;gap:8px;padding:8px 11px;font-size:9px;display:flex}.stage-status>span{align-items:center;gap:2px;height:14px;display:flex}.stage-status i{background:var(--vu-live-green-bright);border-radius:2px;width:2px;height:6px;animation:.8s infinite alternate sound}.stage-status i:nth-child(2){height:12px;animation-delay:.15s}.stage-status i:nth-child(3){height:9px;animation-delay:.3s}.stage-status.speaking i{animation-duration:.45s}@keyframes 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