/* Scoped interactive artwork for the video-course gallery hero. */
.stm-platform-demo{--platform-mint:#99edcf;--platform-muted:#9badbd;position:relative;isolation:isolate;align-self:stretch;display:flex;flex-direction:column;justify-content:center;min-width:0;padding:41px 27px 29px 18px;color:#edf4fa;font-family:inherit;container-type:inline-size}
.stm-platform-demo *{box-sizing:border-box}
.stm-platform-demo button{font:inherit;color:inherit;cursor:pointer;min-width:0;touch-action:manipulation}
.stm-platform-demo button:focus-visible{outline:2px solid var(--platform-mint);outline-offset:3px}
.stm-platform-aura{position:absolute;inset:10% -14% 8% -14%;z-index:-1;background:radial-gradient(ellipse at 58% 43%,#46caab24,transparent 67%);filter:blur(18px);pointer-events:none}
.stm-platform-window{position:relative;width:100%;max-width:530px;margin-inline:auto;border:1px solid #49677099;border-radius:14px;overflow:hidden;background:#111f2c;box-shadow:0 26px 65px #020a136b,0 0 0 5px #b5f0e804,0 1px 0 #d2fffa16 inset;transform:perspective(1200px) rotateY(-5deg) rotateX(2deg)}
.stm-platform-windowbar{height:27px;display:flex;align-items:center;gap:12px;padding:0 12px;border-bottom:1px solid #bedcd80b;background:#182936;color:#96a9b8;font-size:8px;letter-spacing:.4px}
.stm-platform-windowdots{display:flex;gap:4px}.stm-platform-windowdots i{width:5px;height:5px;border-radius:50%;background:#58707a}.stm-platform-windowdots i:first-child{background:#d48d87}.stm-platform-windowdots i:nth-child(2){background:#d0ba81}.stm-platform-windowdots i:nth-child(3){background:#91c5ad}
.stm-platform-secure{margin-left:auto;width:13px;height:13px;color:#88b7b0}.stm-platform-secure svg{display:block;width:100%;height:100%}
.stm-platform-appbar{display:flex;align-items:center;justify-content:space-between;padding:12px 13px;border-bottom:1px solid #d4e5ed0d;background:#11212e}
.stm-platform-brand{display:flex;align-items:center;gap:3px;font-size:11px;font-weight:750;letter-spacing:-.4px;white-space:nowrap}.stm-platform-brand>b{color:#9ce8d4;font-weight:750}.stm-platform-brand>span{display:grid;place-items:center;width:22px;height:22px;margin-right:4px;border:1px solid #9cded540;border-radius:50%;background:#2954514d;color:#acf7de;font:italic 17px Georgia,serif}
.stm-platform-streak{display:flex;align-items:center;gap:4px;border:1px solid #e8af6654;border-radius:20px;padding:4px 7px;color:#f3c38c;font-size:8px;white-space:nowrap}.stm-platform-streak svg{width:9px;height:11px}
.stm-platform-workspace{display:grid;grid-template-columns:32% minmax(0,1fr);min-height:274px}
.stm-platform-playlist{position:relative;display:flex;flex-direction:column;gap:0;padding:17px 9px 12px;background:linear-gradient(180deg,#0b1825,#0e1b28);border-right:1px solid #d3e5ec0b;min-width:0}
.stm-platform-eyebrow{font-size:6.8px;letter-spacing:1.3px;font-weight:700;color:#8cacae;line-height:1.6}
.stm-platform-playlist h3{font-size:13px;font-weight:600;line-height:1.35;letter-spacing:-.2px;margin:6px 0 12px;color:#eef5fc}
.stm-platform-course-progress{height:3px;background:#283943;border-radius:3px;overflow:hidden}.stm-platform-course-progress>span{display:block;width:37%;height:100%;border-radius:inherit;background:#a2e6d0}
.stm-platform-course-count{font-size:6.4px;color:#9badb8;margin:6px 0 14px}
.stm-platform-lesson{position:relative;display:flex;align-items:center;gap:6px;border:1px solid transparent;border-radius:6px;background:transparent;text-align:left;padding:8px 5px;margin-bottom:5px;transition:background .35s,border-color .35s}
.stm-platform-lesson>span:nth-child(2){min-width:0}.stm-platform-lesson b{display:block;font-size:7.8px;font-weight:650;white-space:nowrap}.stm-platform-lesson small{display:block;font-size:5.8px;color:#9caeba;margin-top:3px;line-height:1.4;white-space:nowrap}
.stm-platform-lesson.is-current{border-color:#a0edda4a;background:#48736e2e;box-shadow:0 0 19px #75c9ad05}.stm-platform-lesson.is-current b{color:#b7f0de}.stm-platform-lesson.is-current .stm-platform-lesson-icon{background:#9de3d0;color:#123c36;border-color:transparent}
.stm-platform-lesson-icon{display:grid;place-items:center;flex:0 0 18px;height:18px;border:1px solid #405a6a;border-radius:5px;color:#9eb7c9;font-size:7px;line-height:1}.stm-platform-lesson-icon svg{width:12px;height:12px}.stm-platform-lesson.is-complete .stm-platform-lesson-icon{color:#9cdbc7;background:#2e5e4d38;border-color:#638d7266}
.stm-platform-lesson-wave{position:absolute;right:5px;top:9px;display:flex;align-items:center;gap:1px;height:8px}.stm-platform-lesson-wave i{display:block;width:1.5px;height:4px;background:#9fe5d0}.stm-platform-lesson-wave i:nth-child(2){height:8px}.stm-platform-lesson-wave i:nth-child(3){height:6px}.stm-platform-lesson:not(.is-current) .stm-platform-lesson-wave{display:none}
.stm-platform-sidebar-note{display:block;margin:auto 4px 0;padding-top:18px;color:#76929f;font-size:9px;line-height:1.6;letter-spacing:-.1px}.stm-platform-sidebar-note em{font-style:normal;color:#c5d6db}
.stm-platform-classroom{min-width:0;padding:16px 12px 13px;background:linear-gradient(145deg,#182b39,#12202e)}
.stm-platform-class-heading{display:flex;align-items:center;justify-content:space-between;gap:4px;margin-bottom:10px}.stm-platform-class-heading .stm-platform-eyebrow{font-size:6.4px;letter-spacing:1px;white-space:nowrap}.stm-platform-demo-label{font-size:5.5px;letter-spacing:.5px;padding:2px 4px;border-radius:3px;border:1px solid #90b9b630;color:#93adae}
.stm-platform-video{position:relative;aspect-ratio:1.45;overflow:hidden;border-radius:8px;border:1px solid #7ca49f3d;background:radial-gradient(ellipse at 52% 20%,#24514d8f,transparent 80%),#0b2029}
.stm-platform-video-topic{position:absolute;top:10px;left:12px;z-index:1;display:flex;flex-direction:column;gap:3px;pointer-events:none}.stm-platform-video-topic math{font-size:13px;color:#d5fff0}.stm-platform-video-topic>span{color:#8eb6b1;font-size:5.7px;letter-spacing:.2px}
.stm-platform-graph{position:absolute;inset:18% 3% 8%;width:94%;height:74%;overflow:visible}.stm-platform-grid{stroke:#8bddd717;stroke-width:1}.stm-platform-axes{stroke:#8bb7bd66;stroke-width:1}.stm-platform-axis-arrow{stroke:#8bb7bd66;stroke-width:1}.stm-platform-axis-label{fill:#a4c1c5;font:9px Georgia,serif}.stm-platform-curve-fill{fill:#80ddbf0a}.stm-platform-curve{stroke:#a3e8cb;stroke-width:2.8;stroke-linecap:round;stroke-dasharray:390;stroke-dashoffset:0}.stm-platform-tangent{stroke:#e2b57d;stroke-width:1.6;stroke-linecap:round;stroke-dasharray:5 4;opacity:.45}.stm-platform-coordinate{stroke:#83a9b780;stroke-dasharray:3 4;stroke-width:1}.stm-platform-point{fill:#eefdec}.stm-platform-point-halo{fill:#c4f8ce14;stroke:#c4f8ce36}.stm-platform-graph-label{fill:#a2bfbf;font:9px Georgia,serif}.stm-platform-tangent-label{fill:#e8bd86;font:9px Georgia,serif;opacity:.6}
.stm-platform-video-play{position:absolute;left:50%;top:53%;display:grid;place-items:center;width:34px;height:34px;transform:translate(-50%,-50%);color:#e3ffef;background:#a7eed332;border:1px solid #c7ffe77a;border-radius:50%;box-shadow:0 0 0 7px #ace9ce0a;backdrop-filter:blur(5px);transition:opacity .4s,transform .5s;pointer-events:none}.stm-platform-video-play svg{width:16px;height:16px;margin-left:2px}
.stm-platform-video-control{position:absolute;bottom:0;left:0;right:0;height:22px;display:flex;align-items:center;gap:7px;background:#0a1726c9;padding:0 8px;color:#b8cad5;font-size:5.8px}.stm-platform-mini-play{display:block;width:8px;height:9px}.stm-platform-mini-play svg{width:100%;height:100%}.stm-platform-timeline{flex:1;height:2px;background:#c7e7e424;border-radius:3px;overflow:hidden}.stm-platform-timeline i{display:block;width:36%;height:100%;background:#a5e8d0;border-radius:3px;transform-origin:left}.stm-platform-expand{font-size:11px;color:#d3e5e8}
.stm-platform-class-copy{display:flex;flex-direction:column;gap:5px;margin-top:12px}.stm-platform-class-copy>strong{font-size:12px;line-height:1.4;letter-spacing:-.25px;color:#e6f2f5}.stm-platform-class-copy>span{font-size:7.5px;color:#a2b7c3}
.stm-platform-notes{display:flex;flex-wrap:wrap;gap:6px;margin-top:15px;padding-top:10px;border-top:1px solid #bedee115}.stm-platform-notes>span{display:flex;align-items:center;gap:3px;color:#92b2b6;font-size:5.9px;white-space:nowrap}.stm-platform-notes svg{width:9px;height:9px;color:#99cfbd}
.stm-platform-practice-panel{position:absolute;inset:0;z-index:3;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:15px 10px;background:radial-gradient(ellipse at 20% 10%,#315749,#132b34 90%);opacity:0;visibility:hidden;transform:translateY(8px);transition:opacity .45s,transform .45s,visibility .45s}
.stm-platform-question-kicker{font-size:6.2px;letter-spacing:1.8px;font-weight:700;color:#a0d5bc;margin-bottom:7px}.stm-platform-practice-panel>strong{color:#e9f6ed;font-size:10.5px;line-height:1.75;text-align:center;font-weight:500}.stm-platform-practice-panel>strong math{display:inline;font-size:13px}.stm-platform-answers{display:flex;gap:7px;margin-top:12px}.stm-platform-answers>button{display:grid;place-items:center;min-width:41px;min-height:31px;border:1px solid #9dc9b248;border-radius:6px;background:#0e232b88;color:#d7e7e0;transition:background .3s,border-color .3s,transform .3s}.stm-platform-answers math{font-size:14px}.stm-platform-answers>button:hover{border-color:#b9efd08c;background:#447b654a}.stm-platform-answers>button.is-correct{border-color:#c5f1cd;background:#9cdeb7;color:#143f30;transform:translateY(-2px);box-shadow:0 4px 18px #9cdeb720}.stm-platform-answers>button.is-incorrect{border-color:#e7ba89;background:#6b51422e;color:#f3d5b3}
.stm-platform-feedback{font-size:6.8px!important;color:#adc8c0!important;min-height:1.6em;text-align:center;margin:10px 0 0!important;line-height:1.5!important}.stm-platform-feedback[data-result=correct]{color:#bbf4ce!important}.stm-platform-feedback[data-result=retry]{color:#f0ceaa!important}
.stm-platform-journey{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:5px;padding:10px;border-top:1px solid #caeeee13;background:#0f1e2b}.stm-platform-journey>button{position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center;gap:5px;padding:7px 3px;border:1px solid transparent;border-radius:5px;background:transparent;color:#93a9b6;font-size:8px;letter-spacing:.1px;transition:color .3s,background .3s,border-color .3s}.stm-platform-journey>button>span:first-child{color:#789099;font-size:6px}.stm-platform-journey>button[aria-pressed=true]{color:#c0efd8;background:#91d9be0c;border-color:#aadbc329}.stm-platform-journey>button[aria-pressed=true]>span:first-child{color:#a8d6c0}.stm-platform-step-progress{position:absolute;bottom:0;left:0;width:100%;height:1.5px;background:#9ce5c7;transform:scaleX(0);transform-origin:left}
.stm-platform-caption{display:flex;justify-content:center;align-items:center;gap:8px;max-width:530px;width:100%;margin:18px auto 0;color:#9cb8bc;font:italic 11px/1.6 Georgia,serif;letter-spacing:.25px;white-space:nowrap}.stm-platform-caption-line{width:20px;height:1px;background:#7bafab80}
.stm-platform-orbit{position:absolute;z-index:2;pointer-events:none;color:#9bd8cc99;line-height:1;filter:drop-shadow(0 0 12px #91e0c128)}.stm-platform-orbit math{font-size:17px}.stm-platform-orbit-one{top:16px;right:24px;transform:rotate(8deg)}.stm-platform-orbit-two{bottom:57px;left:-15px;transform:rotate(-9deg);color:#d4bd9699}.stm-platform-orbit-two math{font-size:15px}
.stm-platform-demo[data-phase=study] .stm-platform-video-play,.stm-platform-demo[data-phase=practice] .stm-platform-video-play{opacity:0;transform:translate(-50%,-50%) scale(.8)}
.stm-platform-demo[data-phase=study] .stm-platform-tangent,.stm-platform-demo[data-phase=study] .stm-platform-tangent-label{opacity:1}
.stm-platform-demo[data-phase=practice] .stm-platform-practice-panel{opacity:1;visibility:visible;transform:translateY(0)}
.stm-platform-demo[data-motion=running] .stm-platform-orbit-one{animation:stm-platform-formula-float 8s ease-in-out infinite}.stm-platform-demo[data-motion=running] .stm-platform-orbit-two{animation:stm-platform-formula-float 9s ease-in-out -3s infinite reverse}.stm-platform-demo[data-motion=running] .stm-platform-lesson.is-current .stm-platform-lesson-wave i{animation:stm-platform-wave 1.1s ease-in-out infinite alternate}.stm-platform-demo[data-motion=running] .stm-platform-lesson.is-current .stm-platform-lesson-wave i:nth-child(2){animation-delay:-.4s}.stm-platform-demo[data-motion=running] .stm-platform-lesson.is-current .stm-platform-lesson-wave i:nth-child(3){animation-delay:-.7s}
.stm-platform-demo[data-motion=running][data-phase=study] .stm-platform-curve{animation:stm-platform-draw 4.2s ease both}.stm-platform-demo[data-motion=running][data-phase=study] .stm-platform-point-halo{animation:stm-platform-pulse 2s ease-in-out infinite}.stm-platform-demo[data-motion=running][data-phase=study] .stm-platform-timeline i{animation:stm-platform-video-progress 5s linear both}.stm-platform-demo[data-motion=running] .stm-platform-journey>button[aria-pressed=true] .stm-platform-step-progress{animation:stm-platform-step-fill 5s linear both}
.stm-platform-demo[data-motion=paused] *{animation-play-state:paused!important}
@keyframes stm-platform-formula-float{50%{translate:0 -9px}}@keyframes stm-platform-wave{to{transform:scaleY(.4)}}@keyframes stm-platform-draw{from{stroke-dashoffset:390}to{stroke-dashoffset:0}}@keyframes stm-platform-pulse{50%{opacity:.35;r:14px}}@keyframes stm-platform-video-progress{from{transform:scaleX(1)}to{transform:scaleX(1.5)}}@keyframes stm-platform-step-fill{to{transform:scaleX(1)}}
@container (min-width:430px){.stm-platform-workspace{min-height:300px}.stm-platform-playlist{padding:20px 13px 15px}.stm-platform-playlist h3{font-size:16px}.stm-platform-lesson{padding:11px 6px;gap:7px}.stm-platform-lesson b{font-size:9px}.stm-platform-lesson small{font-size:6.5px}.stm-platform-classroom{padding:20px 16px 16px}.stm-platform-class-copy>strong{font-size:15px}.stm-platform-class-copy>span{font-size:9px}.stm-platform-notes>span{font-size:7px}.stm-platform-journey>button{font-size:10px;padding:8px}.stm-platform-practice-panel>strong{font-size:13px}.stm-platform-practice-panel>strong math{font-size:15px}.stm-platform-answers>button{min-width:48px;min-height:36px}.stm-platform-feedback{font-size:8px!important}.stm-platform-sidebar-note{font-size:11px}.stm-platform-eyebrow{font-size:8px}.stm-platform-class-heading .stm-platform-eyebrow{font-size:8px}.stm-platform-question-kicker{font-size:8px}}
@media(max-width:950px){.stm-videos-hero:has(.stm-platform-demo){grid-template-columns:minmax(0,1fr)}.stm-videos-hero:has(.stm-platform-demo) .stm-videos-hero-copy{padding:30px 30px 0;max-width:100%}.stm-platform-demo{padding:30px 34px 26px;max-width:610px;width:100%;justify-self:center}.stm-platform-orbit-one{right:21px;top:10px}.stm-platform-orbit-two{left:6px;bottom:54px}.stm-platform-window{transform:none}.stm-platform-caption{margin-top:16px}}
@media(max-width:520px){.stm-videos-hero:has(.stm-platform-demo) .stm-videos-hero-copy{padding:28px 23px 0}.stm-videos-hero:has(.stm-platform-demo) .stm-videos-hero-copy>p{max-width:none}.stm-platform-demo{padding:28px 13px 23px;max-width:100%}.stm-platform-orbit-one{right:15px;top:8px}.stm-platform-orbit-one math{font-size:12px}.stm-platform-orbit-two{left:10px;bottom:53px}.stm-platform-orbit-two math{font-size:11px}.stm-platform-caption{font-size:9.5px;letter-spacing:0}.stm-platform-window{border-radius:11px}.stm-platform-workspace{min-height:250px}.stm-platform-playlist{padding-inline:7px}.stm-platform-lesson{padding-inline:4px;gap:4px}.stm-platform-lesson-icon{flex-basis:16px;height:16px}.stm-platform-lesson-wave{right:2px}.stm-platform-classroom{padding-inline:10px}}
@media(prefers-reduced-motion:reduce){.stm-platform-demo *{animation:none!important;transition:none!important}.stm-platform-window{transform:none}.stm-platform-step-progress{display:none}}