:root {
  color-scheme: light;
  --ink: #18332f;
  --muted: #62746f;
  --paper: #f4f7f2;
  --sky: #bfe9e8;
  --teal: #087f73;
  --teal-dark: #075f58;
  --coral: #f06d55;
  --yellow: #ffd45c;
  --blue: #2368ba;
  --line: #d9e2dc;
  font-family: "Avenir Next", Avenir, "Segoe UI", sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 1100px;
  min-height: 100vh;
  overflow: hidden;
  color: var(--ink);
  background: var(--paper);
}

button { font: inherit; }
button:focus-visible { outline: 4px solid #174f9a; outline-offset: 4px; }

.lesson {
  position: relative;
  width: min(1380px, calc(100vw - 48px));
  height: calc(100vh - 24px);
  min-height: 720px;
  margin: 12px auto;
  display: grid;
  grid-template-rows: minmax(500px, 1fr) 190px;
  gap: 14px;
}

.mute-button {
  position: absolute;
  z-index: 20;
  top: 18px;
  right: 18px;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid rgba(24, 51, 47, .12);
  border-radius: 50%;
  color: var(--ink);
  background: rgba(255, 255, 255, .9);
  box-shadow: 0 5px 16px rgba(24, 51, 47, .12);
  cursor: pointer;
}
.mute-button svg { grid-area: 1 / 1; width: 24px; fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
.mute-button .sound-off, .mute-button[aria-pressed="true"] .sound-on { display: none; }
.mute-button[aria-pressed="true"] .sound-off { display: block; }

.park {
  position: relative;
  overflow: hidden;
  border: 1px solid #cbdad3;
  border-radius: 28px;
  background: linear-gradient(#aee1e5 0 55%, #86c789 55% 64%, #e7e3d7 64%);
  box-shadow: 0 18px 44px rgba(31, 72, 63, .14);
  isolation: isolate;
}
.park::after {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 64% 0 0;
  background: repeating-linear-gradient(100deg, transparent 0 150px, rgba(83, 89, 80, .08) 151px 153px);
}
.sun { position: absolute; top: 46px; right: 115px; width: 70px; height: 70px; border-radius: 50%; background: var(--yellow); box-shadow: 0 0 0 15px rgba(255, 212, 92, .2); }
.cloud { position: absolute; width: 124px; height: 30px; border-radius: 30px; background: rgba(255,255,255,.76); }
.cloud::before, .cloud::after { content: ""; position: absolute; bottom: 0; border-radius: 50%; background: inherit; }
.cloud::before { left: 20px; width: 52px; height: 52px; }.cloud::after { right: 18px; width: 42px; height: 42px; }
.cloud-one { left: 43%; top: 66px; }.cloud-two { left: 72%; top: 150px; transform: scale(.72); opacity: .65; }
.city { position: absolute; z-index: -1; left: 0; right: 0; bottom: 35%; display: flex; align-items: end; gap: 10px; padding: 0 48px; opacity: .2; }
.city i { width: 65px; height: 60px; background: var(--teal-dark); }.city i:nth-child(2) { height: 100px; }.city i:nth-child(3) { height: 75px; }.city i:nth-child(4) { margin-left: auto; height: 88px; }.city i:nth-child(5) { height: 52px; }

.scene-copy { position: absolute; z-index: 2; top: 30px; left: 38px; max-width: 560px; }
.scene-copy span { color: var(--teal-dark); font-size: 13px; font-weight: 900; letter-spacing: .1em; text-transform: uppercase; }
.scene-copy h1 { margin: 7px 0 5px; font-size: clamp(28px, 2.6vw, 39px); line-height: 1.05; letter-spacing: -.025em; }
.scene-copy p { margin: 0; color: #405b55; font-size: 16px; }

.ramp-grid {
  position: absolute;
  left: 34px;
  right: 34px;
  bottom: 28px;
  height: 360px;
  display: flex;
  align-items: end;
  justify-content: center;
  gap: 58px;
}
.ramp-card { position: relative; width: min(44%, 520px); height: 340px; display: flex; align-items: end; justify-content: center; }
.ramp-card.is-solo { width: 760px; }
.ramp-name { position: absolute; top: 24px; left: 50%; transform: translateX(-50%); min-width: 150px; padding: 8px 14px; border-radius: 999px; background: rgba(255,255,255,.82); text-align: center; color: var(--muted); font-size: 13px; font-weight: 800; }
.ramp-name strong { color: var(--ink); }
.ramp-wrap { position: relative; width: var(--ramp-w); height: var(--ramp-h); margin-bottom: 22px; }
.ramp-face { position: absolute; inset: 0; clip-path: polygon(0 0, 100% 100%, 0 100%); background: linear-gradient(135deg, #178f83, #087166); filter: drop-shadow(0 13px 10px rgba(24,51,47,.18)); }
.ramp-face::after { content: ""; position: absolute; inset: 0; background-image: radial-gradient(rgba(255,255,255,.18) 1.5px, transparent 1.5px); background-size: 18px 18px; }
.ramp-edge { position: absolute; z-index: 2; left: 0; top: 0; width: calc(var(--ramp-diagonal) * 1px); height: 12px; border-radius: 9px; background: var(--yellow); box-shadow: 0 3px 0 #1d514d; transform-origin: left center; transform: rotate(var(--ramp-angle)); }
.measure-rise, .measure-run { position: absolute; z-index: 3; display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 900; }
.measure-rise { left: -45px; top: 0; width: 36px; height: 100%; border-right: 3px dashed rgba(255,255,255,.9); }
.measure-run { left: 0; bottom: -42px; width: 100%; height: 34px; border-top: 3px dashed rgba(255,255,255,.9); }
.measure-rise span, .measure-run span { padding: 5px 9px; border-radius: 8px; background: #fff; color: var(--ink); box-shadow: 0 3px 8px rgba(24,51,47,.12); font-size: 15px; white-space: nowrap; }
.ratio-tag { position: absolute; z-index: 5; right: 18px; bottom: 18px; padding: 8px 12px; border-radius: 10px; background: #fff; color: var(--ink); box-shadow: 0 4px 12px rgba(24,51,47,.14); font-size: 18px; font-weight: 900; opacity: 0; transform: translateY(8px); transition: opacity 150ms ease-out, transform 150ms ease-out; }
.show-evidence .ratio-tag { opacity: 1; transform: translateY(0); }
.ratio-tag small { display: block; color: var(--muted); font-size: 10px; letter-spacing: .08em; text-transform: uppercase; }
.skater { position: absolute; z-index: 6; left: -18px; top: -43px; width: 52px; height: 24px; transform-origin: center; transform: rotate(var(--ramp-angle)); transition: left var(--ride-speed, 950ms) cubic-bezier(.22,.7,.35,1), top var(--ride-speed, 950ms) cubic-bezier(.22,.7,.35,1); }
.skater::before { content: ""; position: absolute; left: 5px; top: 5px; width: 43px; height: 8px; border-radius: 5px; background: var(--coral); box-shadow: -1px 9px 0 -2px #233b38, 35px 9px 0 -2px #233b38; }
.skater::after { content: ""; position: absolute; left: 18px; top: -20px; width: 21px; height: 26px; border-radius: 11px 11px 5px 5px; background: #235fa8; box-shadow: 4px -13px 0 -3px #91583d; }
.is-riding .skater { left: calc(100% - 26px); top: calc(100% - 24px); }
.ghost-line { position: absolute; z-index: 4; left: 0; bottom: 0; width: calc(var(--ghost-diagonal) * 1px); border-top: 4px dashed rgba(240,109,85,.9); transform-origin: left; transform: rotate(var(--ghost-angle)); }
.ghost-label { position: absolute; left: 48%; bottom: 72%; padding: 5px 9px; border-radius: 7px; color: #9b3c2d; background: rgba(255,255,255,.88); font-size: 12px; font-weight: 900; }

.candidate-strip { position: absolute; z-index: 8; left: 50%; bottom: 20px; transform: translateX(-50%); display: flex; gap: 10px; }
.candidate { min-width: 104px; padding: 10px 14px; border: 2px solid rgba(24,51,47,.12); border-radius: 12px; background: #fff; color: var(--ink); font-weight: 900; cursor: pointer; box-shadow: 0 4px 0 rgba(24,51,47,.12); }
.candidate:hover { transform: translateY(-2px); }.candidate.is-selected { border-color: var(--teal); background: #e6f6f2; box-shadow: 0 4px 0 var(--teal); }

.decision-card { min-height: 190px; display: grid; grid-template-columns: minmax(260px, .85fr) 2fr; align-items: center; gap: 34px; padding: 24px 30px; border: 1px solid var(--line); border-radius: 24px; background: #fff; box-shadow: 0 10px 28px rgba(31,72,63,.09); }
.decision-card[hidden] { display: none; }
.decision-heading span { color: var(--coral); font-size: 12px; font-weight: 900; letter-spacing: .11em; text-transform: uppercase; }
.decision-heading h2 { margin: 7px 0 0; font-size: clamp(24px, 2.2vw, 33px); line-height: 1.08; letter-spacing: -.02em; }
.decision-content { min-width: 0; }
.choice-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.choice-button { min-height: 88px; display: grid; place-items: center; gap: 2px; padding: 12px; border: 2px solid var(--line); border-radius: 16px; background: #fbfcfa; color: var(--ink); cursor: pointer; transition: transform 150ms ease-out, border-color 150ms ease-out, background 150ms ease-out; }
.choice-button:hover { transform: translateY(-2px); border-color: #9ec8be; background: #f2fbf8; }
.choice-button strong { font-size: 20px; }.choice-button small { color: var(--muted); font-size: 13px; }
.choice-button.is-chosen { border-color: var(--teal); background: #e7f6f2; }
.action-panel { display: flex; align-items: center; justify-content: space-between; gap: 22px; }
.evidence-copy { display: flex; align-items: center; gap: 14px; max-width: 610px; }
.evidence-icon { flex: 0 0 48px; width: 48px; height: 48px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: var(--teal); font-size: 24px; font-weight: 900; }
.evidence-copy strong { display: block; font-size: 18px; }.evidence-copy p { margin: 3px 0 0; color: var(--muted); line-height: 1.35; }
.primary-button { min-width: 190px; min-height: 58px; padding: 14px 24px; border: 0; border-radius: 14px; color: #fff; background: var(--teal); box-shadow: 0 5px 0 var(--teal-dark); font-weight: 900; cursor: pointer; }
.primary-button:hover { transform: translateY(-2px); box-shadow: 0 7px 0 var(--teal-dark); }.primary-button:active { transform: translateY(3px); box-shadow: 0 2px 0 var(--teal-dark); }
.primary-button.is-coral { background: var(--coral); box-shadow: 0 5px 0 #b84b3c; }

.level-intro, .celebration { position: absolute; z-index: 15; inset: 0; display: grid; place-content: center; justify-items: center; padding: 50px; background: rgba(234,247,242,.94); text-align: center; backdrop-filter: blur(7px); }
.level-intro[hidden], .celebration[hidden] { display: none; }
.intro-number, .final-badge { width: 64px; height: 64px; display: grid; place-items: center; margin-bottom: 16px; border-radius: 18px; color: #fff; background: var(--coral); box-shadow: 0 7px 0 #b84b3c; font-size: 22px; font-weight: 900; transform: rotate(-4deg); }
.level-intro > span, .celebration > span { color: var(--teal-dark); font-size: 12px; font-weight: 900; letter-spacing: .13em; text-transform: uppercase; }
.level-intro h1, .celebration h1 { margin: 9px 0; font-size: 48px; letter-spacing: -.035em; }
.level-intro p, .celebration p { max-width: 590px; margin: 0 0 24px; color: #4d655f; font-size: 18px; line-height: 1.45; }
.level-intro button, .celebration button { min-width: 230px; min-height: 58px; border: 0; border-radius: 14px; color: #fff; background: var(--teal); box-shadow: 0 5px 0 var(--teal-dark); font-weight: 900; cursor: pointer; }
.final-badge { border-radius: 50%; background: var(--teal); box-shadow: 0 7px 0 var(--teal-dark); }

.live-callout { position: absolute; z-index: 12; top: 106px; left: 50%; transform: translate(-50%, -8px); padding: 9px 15px; border-radius: 999px; color: #fff; background: var(--ink); opacity: 0; pointer-events: none; font-weight: 800; transition: opacity 150ms ease-out, transform 150ms ease-out; }
.live-callout.is-showing { opacity: 1; transform: translate(-50%, 0); }
.park.is-celebrating .ramp-card { animation: park-pop 420ms ease-out both; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

@keyframes park-pop { 50% { transform: translateY(-8px); } }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}