.arch-entry{--ae-ink:#174b3a;--ae-bg:#eef7f1;--ae-border:#c5ddcf;display:grid;grid-template-columns:minmax(0,1fr) minmax(200px,290px);gap:24px;align-items:center;margin:20px 0 28px;padding:24px 28px;border:1px solid var(--ae-border);border-radius:20px;background:var(--ae-bg);color:var(--ae-ink)}
.arch-entry .arch-entry-eyebrow{margin:0 0 8px;font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase}.arch-entry h2{margin:0 0 10px;font-size:clamp(22px,3vw,28px);line-height:1.2}.arch-entry p{margin:0;font-size:16px;line-height:1.6}.arch-entry ol{display:flex;flex-wrap:wrap;gap:8px 18px;list-style:none;counter-reset:arch-step;padding:0;margin:16px 0 0;font-size:13px;font-weight:600}.arch-entry li{counter-increment:arch-step;display:flex;gap:7px;align-items:center}.arch-entry li:before{content:counter(arch-step);display:grid;place-items:center;border:1px solid var(--ae-border);border-radius:50%;width:24px;height:24px;flex:none}.arch-entry-action{display:grid;gap:10px}.arch-entry-action a{display:flex;justify-content:center;align-items:center;gap:8px;min-height:48px;padding:12px 18px;border-radius:12px;background:#176447;color:#fff;text-decoration:none;font-size:16px;font-weight:700;text-align:center;line-height:1.4}.arch-entry-action a:hover{background:#124f39}.arch-entry-action a:focus-visible{outline:3px solid #ca872d;outline-offset:4px}.arch-entry-action small{font-size:12px;line-height:1.5;text-align:center}.arch-featured [data-lesson-model]>summary{scroll-margin-top:120px}.arch-featured .lesson-model-content{padding-top:16px}
html[data-theme="dark"] .arch-entry{--ae-ink:#deefe5;--ae-bg:#162e29;--ae-border:#35554a}html[data-theme="dark"] .arch-entry-action a{background:#9bdfba;color:#133b2c}html[data-theme="dark"] .arch-entry-action a:hover{background:#b0eccb}
@media(prefers-color-scheme:dark){html:not([data-theme="light"]) .arch-entry{--ae-ink:#deefe5;--ae-bg:#162e29;--ae-border:#35554a}}
@media(max-width:650px){.arch-entry{grid-template-columns:1fr;gap:12px;padding:16px;margin:16px 0 24px}.arch-entry ol,.arch-entry .arch-entry-eyebrow{display:none}.arch-entry p{font-size:14px;line-height:1.5}.arch-entry-action a{width:100%;box-sizing:border-box}.arch-entry h2{font-size:22px}}
/* The summary already names the experiment; bring its controls into view. */
.arch-featured .lesson-model-content{padding:10px 0 12px}.arch-featured .lesson-model-content>.disclosure-body{padding:0 8px 12px}.arch-featured .lesson-model-caution{margin:0 8px 12px;font-size:13px;line-height:1.5}.arch-featured .arch-lab{margin:0}.arch-featured .arch-lab>header{margin:0 0 14px}.arch-featured .arch-lab>header>.interactive-eyebrow,.arch-featured .arch-lab>header>h3{display:none}.arch-featured .arch-lab>header>p{font-size:15px;line-height:1.5;margin:0}.arch-featured .arch-label{line-height:1.45}
@media(max-width:650px){.arch-featured .lesson-model-content>.disclosure-body{padding:0 2px 12px}.arch-featured .lesson-model-caution{margin:0 2px 10px}.arch-featured .arch-lab>header{margin-bottom:12px}.arch-featured .lesson-model-content{padding-top:10px}}
/* Motion follows a mathematical action; no decorative autoplay. */
.arch-featured .arch-corners-cell{position:relative;transition:background-color .18s,border-color .18s,box-shadow .18s}.arch-featured .arch-corners-cell[aria-pressed=true]{box-shadow:inset 0 0 0 3px var(--arch-corners-pick),0 0 0 3px var(--arch-surface)}
.arch-featured .arch-laps-runner-petya{color:var(--arch-laps-petya)}.arch-featured .arch-laps-runner-vasya{color:var(--arch-laps-vasya)}.arch-featured .arch-laps-runner-kolya{color:var(--arch-laps-kolya)}.arch-featured .arch-laps-shirt{fill:currentColor;stroke:#fff;stroke-width:1.5}.arch-featured .arch-laps-legs,.arch-featured .arch-laps-arms{fill:none;stroke:currentColor;stroke-width:4;stroke-linecap:round;stroke-linejoin:round}.arch-featured .arch-laps-running .arch-laps-legs{transform-origin:0 7px;animation:academy-stride .32s ease-in-out infinite alternate}.arch-featured .arch-laps-runner-vasya .arch-laps-legs{animation-delay:-.12s}.arch-featured .arch-laps-runner-kolya .arch-laps-legs{animation-delay:-.23s}
@keyframes academy-stride{from{transform:rotate(-13deg)}to{transform:rotate(13deg)}}
.arch-featured .arch25-pans{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:14px 0}.arch-featured .arch25-pan{min-width:0;border:1px solid var(--arch-grid);border-bottom:4px solid var(--arch-accent);border-radius:8px 8px 30px 30px;padding:12px 10px;text-align:center;background:var(--arch-surface)}.arch-featured .arch25-pan strong{display:block;font-size:14px}.arch-featured .arch25-pan-2{border-bottom-style:double;border-bottom-width:5px}.arch-featured .arch25-pan-coins{display:flex;flex-wrap:wrap;justify-content:center;gap:5px;min-height:36px;align-items:center;margin-top:8px}.arch-featured .arch25-pan-coin{display:inline-grid;place-items:center;width:30px;height:30px;flex:none;border:1px solid var(--arch-accent);border-radius:50%;background:var(--arch-fill);color:var(--arch-ink);font-size:14px;font-weight:700}.arch-featured .arch25-pan-coin.is-new{animation:academy-coin .28s ease-out}.arch-featured .arch25-coin-board button{transition:background-color .16s,box-shadow .16s}.arch-featured .arch25-coin-board button[data-pan="1"]{box-shadow:inset 0 -4px var(--arch-accent)}.arch-featured .arch25-coin-board button[data-pan="2"]{box-shadow:inset 0 4px var(--arch-accent)}
@keyframes academy-coin{from{opacity:.2;transform:translateY(-14px) scale(.75)}to{opacity:1;transform:translateY(0) scale(1)}}
@media(prefers-reduced-motion:reduce){.arch-featured .arch-laps-running .arch-laps-legs,.arch-featured .arch25-pan-coin.is-new{animation:none}.arch-featured .arch-corners-cell,.arch-featured .arch25-coin-board button{transition:none}}
.arch-featured .arch-laps-athlete{transform:scale(.82)}
.arch-featured .arch-laps-athlete .arch-laps-face{fill:#efbd96!important;stroke:#fff!important;stroke-width:.8}.arch-featured .arch-laps-hair,.arch-featured .arch-laps-shorts{fill:#27334b;stroke:#fff;stroke-width:.6}.arch-featured .arch-laps-legs{stroke:#e9b78f;stroke-width:3.5}.arch-featured .arch-laps-arms{stroke:#e9b78f;stroke-width:3.5}.arch-featured .arch-laps-shoe{stroke:#27334b;stroke-width:4}.arch-featured .arch-laps-running .arch-laps-leg-back{animation-direction:alternate-reverse}