.route-stack{gap:88px;min-height:1420px;padding-top:76px;padding-bottom:92px}.route-stack::before{top:82px;bottom:84px}.theme-stop:nth-of-type(odd){transform:translateX(10px)}.theme-stop:nth-of-type(even){transform:translateX(-8px)}.variants-scroll{display:grid;grid-auto-flow:column;grid-template-rows:repeat(2,62px);grid-auto-columns:64px;align-items:center;gap:9px 13px;overflow-x:auto;padding:11px 7px 14px;scroll-snap-type:x proximity}.variant-island{width:62px;height:57px;min-height:0;scroll-snap-align:start}.variant-island:nth-child(4n+1){transform:translateY(-7px)}.variant-island:nth-child(4n+2){transform:translateY(7px)}.variant-island:nth-child(4n+3){transform:translateY(3px)}.variant-island:nth-child(4n){transform:translateY(-3px)}.variant-island.starred{position:relative;border-color:var(--amber);background:linear-gradient(145deg,color-mix(in srgb,var(--amber) 34%,var(--paper)),color-mix(in srgb,var(--coral) 12%,var(--paper)));color:color-mix(in srgb,var(--amber) 75%,var(--ink));box-shadow:0 7px 0 color-mix(in srgb,var(--amber) 32%,transparent),0 13px 23px color-mix(in srgb,var(--amber) 24%,transparent)}.variant-island.starred::after{content:"★";position:absolute;right:-7px;top:-10px;width:23px;height:23px;display:grid;place-items:center;border-radius:50%;background:var(--amber);border:2px solid var(--paper);color:#fff;font-size:13px}.variant-island.starred:hover{border-color:var(--amber);transform:translateY(-8px) scale(1.04)}.difficulty-note{margin:0 0 7px;color:var(--amber);font-size:11px;font-weight:850;letter-spacing:.08em}.math-keypad{box-shadow:inset 0 1px 0 color-mix(in srgb,var(--paper) 70%,transparent)}@media(max-width:720px){.route-stack{gap:70px;min-height:1320px;padding-top:66px;padding-bottom:72px}.route-stack::before{top:70px;bottom:67px}.theme-stop:nth-of-type(odd),.theme-stop:nth-of-type(even){transform:none}.variants-scroll{grid-template-rows:repeat(2,53px);grid-auto-columns:55px;gap:7px 10px;padding:8px 3px 12px}.variant-island{width:53px;height:49px;font-size:11px}.variant-island.starred::after{right:-6px;top:-9px;width:20px;height:20px;font-size:11px}}