@layer theme{:root,:host{--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--default-transition-duration:.15s;--default-transition-timing-function:cubic-bezier(.4, 0, .2, 1);--default-font-family:var(--font-sans);--default-mono-font-family:var(--font-mono)}}@layer base{*,:after,:before,::backdrop{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}html,:host{-webkit-text-size-adjust:100%;tab-size:4;line-height:1.5;font-family:var(--default-font-family,-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color 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utilities{.visible{visibility:visible}.sr-only{clip-path:inset(50%);white-space:nowrap;border-width:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.absolute{position:absolute}.static{position:static}.container{width:100%}@media(min-width:40rem){.container{max-width:40rem}}@media(min-width:48rem){.container{max-width:48rem}}@media(min-width:64rem){.container{max-width:64rem}}@media(min-width:80rem){.container{max-width:80rem}}@media(min-width:96rem){.container{max-width:96rem}}.grid{display:grid}.hidden{display:none}.grow{flex-grow:1}.transition{transition-property:color,background-color,border-color,outline-color,text-decoration-color,fill,stroke,--tw-gradient-from,--tw-gradient-via,--tw-gradient-to,opacity,box-shadow,transform,translate,scale,rotate,filter,-webkit-backdrop-filter,backdrop-filter,display,content-visibility,overlay,pointer-events;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration))}}:root{color:#1b2b46;font-synthesis:none;--blue:#0755cf;--ink:#1b2b46;--muted:#607087;--border:#e2e8f0;--surface:#fff;--soft:#f6f8fc;--pale:#edf3ff;background:#fff;font-family:Inter,Segoe 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a.active:after{content:"";background:var(--blue);height:2px;position:absolute;bottom:18px;left:0;right:0}.header-actions{align-items:center;gap:12px;display:flex}.icon-button{width:40px;height:40px;color:var(--ink);background:0 0;border-radius:8px;place-items:center;display:grid}.icon-button:hover{background:var(--pale)}.button{background:var(--blue);border:1px solid var(--blue);color:#fff;border-radius:7px;justify-content:center;align-items:center;gap:10px;min-height:46px;padding:12px 22px;font-size:13px;font-weight:600;transition:background .18s,transform .18s;display:inline-flex}.button:hover{background:#0645a8;transform:translateY(-1px)}.button.secondary{background:var(--surface);color:var(--ink);border-color:var(--border)}.button.secondary:hover{background:var(--soft)}.button.small{min-height:42px;padding:10px 16px;font-size:12px}.menu-button{display:none}.hero{border-bottom:1px solid var(--border);background:linear-gradient(105deg,#f8faff,#f9fbff,#edf3fc)}.hero-grid{grid-template-columns:1.1fr 1fr;align-items:center;gap:42px;padding-top:69px;padding-bottom:65px;display:grid}.eyebrow{letter-spacing:.14em;color:var(--blue);align-items:center;gap:8px;margin-bottom:17px;font-size:10px;font-weight:700;display:flex}.live-dot{background:var(--blue);border-radius:50%;width:7px;height:7px;box-shadow:0 0 0 4px #e2ecfc}.hero h1{letter-spacing:-.048em;margin-bottom:27px;font-size:clamp(2.8rem,4.65vw,4.1rem);line-height:1.12}.hero h1>span{color:var(--blue);display:inline-block;position:relative}.hero h1 svg{fill:none;stroke:#e53745;stroke-width:3px;stroke-linecap:round;width:100%;height:16px;position:absolute;bottom:-10px;left:0}.hero-description{max-width:440px;font-size:14px;line-height:1.9}.hero-description 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.muted{margin-top:10px;font-size:13px}.text-link{color:var(--blue);flex-shrink:0;align-items:center;gap:8px;font-size:12px;font-weight:600;display:inline-flex}.class-grid{grid-template-columns:repeat(7,minmax(0,1fr));gap:13px;display:grid}.class-card{border:1px solid var(--border);background:var(--surface);border-radius:9px;padding:20px 15px 17px;transition:transform .2s,border-color .2s;position:relative}.class-card:hover{border-color:var(--blue);transform:translateY(-4px)}.class-number{background:var(--pale);width:39px;height:39px;color:var(--blue);border-radius:8px;place-items:center;margin-bottom:19px;font-size:17px;font-weight:650;display:grid}.class-card>svg{color:#93a1b6;width:14px;position:absolute;top:24px;right:13px}.class-card h3{margin-bottom:5px;font-size:14px}.class-card p{font-size:11px}.class-level{border-top:1px solid var(--border);color:var(--muted);margin-top:15px;padding-top:12px;font-size:9px;display:block}.class-card:nth-child(4) 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var(--border);padding-left:30px}.footer-note>svg{color:var(--blue);margin-bottom:16px}.footer-note h3{margin-bottom:0}.footer-bottom{border-top:1px solid var(--border);color:var(--muted);justify-content:space-between;gap:20px;padding-block:20px;font-size:9px;display:flex}.footer-bottom>div{gap:19px;display:flex}.page{min-height:60vh;padding-block:25px 70px}.breadcrumbs{color:var(--muted);flex-wrap:wrap;gap:10px;margin-bottom:35px;font-size:12px;display:flex}.breadcrumbs a:hover{text-decoration:underline}.page-heading{margin-bottom:32px}.page-heading h1{margin-bottom:15px;font-size:clamp(2rem,4vw,3rem)}.page-heading 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10px;font-size:11px;display:inline-block}.actions{flex-wrap:wrap;align-items:center;gap:12px;margin:22px 0;display:flex}.lesson-row{border-bottom:1px solid var(--border);justify-content:space-between;gap:12px;padding:15px 0;font-size:13px;display:flex}.lesson-row[aria-current]{color:var(--blue);font-weight:650}.learn-grid{grid-template-columns:minmax(0,2.2fr) minmax(230px,1fr);gap:25px;display:grid}.video-player{aspect-ratio:16/9;background:#0d1523;border:0;border-radius:10px;width:100%}.player-note{margin-block:12px;font-size:12px}.player-note a:not(.button),.prose a:not(.button),.contact-form a:not(.button),.attribution a:not(.button){color:var(--blue);text-decoration:underline}.learn-grid>div>p{margin-bottom:18px}.notes-label{flex-direction:column;gap:12px;font-size:14px;font-weight:600;display:flex}.notes-label textarea{width:100%;min-height:160px;font-weight:400}.lesson-sidebar summary{cursor:pointer;font-size:14px;font-weight:650}.lesson-sidebar 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