:root {
  --bg: #020817;
  --panel: rgba(18, 20, 54, 0.82);
  --panel-border: rgba(93, 222, 255, 0.16);
  --cyan: #18bff4;
  --cyan-soft: #7de6ff;
  --magenta: #ff3aa7;
  --olive: #8faa2b;
  --text: #f5f8ff;
  --muted: #a9b2cf;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, Arial, Helvetica, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 78% 68%, rgba(45, 30, 185, 0.55), transparent 30%),
    radial-gradient(circle at 17% 86%, rgba(0, 88, 150, 0.55), transparent 24%),
    linear-gradient(170deg, #02040b 0%, #061123 48%, #05051a 100%);
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: auto -12vw -18vh -12vw;
  height: 46vh;
  background: linear-gradient(140deg, rgba(0, 111, 178, 0.55), rgba(35, 17, 143, 0.8));
  border-radius: 55% 45% 0 0 / 60% 80% 0 0;
  filter: blur(1px);
  z-index: -1;
}

.wheel-page { min-height: 100vh; padding: clamp(20px, 4vw, 54px); }
.hero { max-width: 1320px; margin: 0 auto; }

.brand-block { max-width: 760px; margin-bottom: 26px; }
h1 { margin: 0 0 4px; font-size: clamp(34px, 4vw, 62px); text-transform: uppercase; line-height: 0.95; color: var(--cyan); letter-spacing: -0.04em; }
.byline { margin: 0 0 16px; color: var(--text); font-size: clamp(16px, 1.4vw, 22px); }
.intro { color: var(--muted); font-size: clamp(16px, 1.4vw, 20px); margin: 0; }

.experience {
  display: grid;
  grid-template-columns: minmax(420px, 1fr) minmax(360px, 520px);
  align-items: center;
  gap: clamp(26px, 5vw, 72px);
}

.wheel-wrap { position: relative; width: min(100%, 720px); margin: 0 auto; }
#wheel { width: 100%; height: auto; display: block; overflow: visible; }

.core-bg { fill: rgba(6, 13, 31, 0.82); stroke: none; }
.core-label { fill: var(--text); font-size: 34px; font-weight: 900; text-anchor: middle; dominant-baseline: middle; }
.core-sub { fill: var(--muted); font-size: 14px; text-anchor: middle; text-transform: uppercase; letter-spacing: .18em; }

.segment { fill: none; stroke: var(--cyan); stroke-width: 15; stroke-linecap: round; opacity: .42; cursor: pointer; transition: opacity .25s ease, stroke-width .25s ease; }
.segment.active { opacity: 1; stroke-width: 20; filter: url(#glow); }
.segment:hover { opacity: .78; }

.inner-arc { fill: none; stroke: url(#innerGrad); stroke-width: 12; stroke-linecap: round; opacity: .8; }
.label { fill: var(--cyan); font-size: 19px; font-weight: 900; cursor: pointer; text-transform: uppercase; letter-spacing: .015em; }
.label.active { fill: var(--cyan-soft); filter: url(#glow); }
.inner-label { fill: var(--olive); font-size: 20px; font-weight: 900; text-transform: uppercase; letter-spacing: .04em; opacity: .96; }
.label-path { fill: none; stroke: none; pointer-events: none; }
.traveller { fill: var(--magenta); filter: url(#glow); transition: transform .55s cubic-bezier(.2,.8,.2,1); transform-origin: 360px 360px; }

.stage-card {
  padding: clamp(22px, 3vw, 34px);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 28px;
  box-shadow: 0 30px 90px rgba(0,0,0,.35);
  backdrop-filter: blur(16px);
  min-height: 560px;
  transition: opacity .2s ease, transform .2s ease;
}
.stage-card.changing { opacity: 0; transform: translateY(8px); }
.stage-meta { display: flex; justify-content: space-between; gap: 20px; color: var(--cyan-soft); text-transform: uppercase; letter-spacing: .16em; font-weight: 800; font-size: 12px; }
.stage-card h2 { font-size: clamp(34px, 4vw, 62px); margin: 18px 0 10px; letter-spacing: -.04em; }
.objective { font-size: clamp(18px, 1.6vw, 24px); color: white; margin: 0 0 28px; font-weight: 700; }
.content-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
h3 { color: var(--cyan-soft); font-size: 12px; text-transform: uppercase; letter-spacing: .18em; margin: 0 0 8px; }
p { line-height: 1.55; }
.content-grid p { color: var(--muted); margin: 0; font-size: 16px; }

.controls { display: flex; justify-content: center; gap: 12px; margin-top: 24px; flex-wrap: wrap; }
button {
  border: 1px solid rgba(125, 230, 255, .25);
  color: var(--text);
  background: rgba(23, 31, 72, .86);
  padding: 14px 22px;
  border-radius: 999px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .08em;
  cursor: pointer;
}
button.primary { background: rgba(24, 191, 244, .16); border-color: rgba(24,191,244,.65); color: var(--cyan-soft); }
button:hover { transform: translateY(-1px); }

@media (max-width: 980px) {
  .experience { grid-template-columns: 1fr; }
  .wheel-wrap { max-width: 680px; }
  .stage-card { min-height: auto; }
}
@media (max-width: 620px) {
  .wheel-page { padding: 18px; }
  .content-grid { grid-template-columns: 1fr; }
  .experience { gap: 18px; }
  .label { font-size: 17px; }
  .inner-label { font-size: 15px; }
  .stage-meta { flex-direction: column; gap: 6px; }
}