:root {
  --bg-start: #1a0e1a;
  --bg-end: #4d162f;
  --panel-glow: rgba(255, 209, 128, 0.22);
  --canvas-shadow: rgba(13, 4, 12, 0.48);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  display: grid;
  place-items: center;
  overflow: hidden;
  background:
    radial-gradient(circle at 20% 20%, rgba(245, 173, 90, 0.18), transparent 30%),
    radial-gradient(circle at 80% 15%, rgba(99, 181, 188, 0.16), transparent 28%),
    linear-gradient(145deg, var(--bg-start), var(--bg-end) 58%, #140811);
  font-family: "Hiragino Sans GB", "PingFang SC", "Microsoft YaHei", "STHeiti", sans-serif;
}

body::before,
body::after {
  content: "";
  position: fixed;
  inset: auto;
  width: 42vmax;
  height: 42vmax;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(18px);
}

body::before {
  top: -12vmax;
  left: -12vmax;
  background: radial-gradient(circle, rgba(255, 214, 143, 0.18), transparent 60%);
}

body::after {
  right: -12vmax;
  bottom: -12vmax;
  background: radial-gradient(circle, rgba(78, 160, 173, 0.2), transparent 58%);
}

.page-nav {
  position: fixed;
  top: 18px;
  left: 50%;
  z-index: 2;
  display: flex;
  gap: 10px;
  padding: 8px;
  transform: translateX(-50%);
  border: 1px solid rgba(255, 226, 180, 0.12);
  border-radius: 999px;
  background: rgba(24, 10, 24, 0.62);
  box-shadow: 0 16px 30px rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(14px);
}

.page-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 88px;
  padding: 10px 16px;
  border-radius: 999px;
  color: rgba(255, 237, 208, 0.92);
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  transition:
    background-color 180ms ease,
    color 180ms ease,
    transform 180ms ease;
}

.page-link:hover {
  background: rgba(255, 226, 180, 0.12);
  color: #fff4db;
  transform: translateY(-1px);
}

.page-link.is-active {
  background: linear-gradient(180deg, rgba(255, 217, 145, 0.96), rgba(225, 154, 84, 0.92));
  color: #4f1f19;
}

.app-shell {
  display: grid;
  place-items: center;
  width: 100vw;
  min-height: 100vh;
  padding: 72px 24px 24px;
}

#wheel-canvas {
  width: min(88vmin, 760px);
  height: min(88vmin, 760px);
  border-radius: 28px;
  box-shadow:
    0 36px 80px var(--canvas-shadow),
    0 0 0 1px rgba(255, 232, 192, 0.08),
    0 0 32px var(--panel-glow);
  outline: none;
  cursor: pointer;
  touch-action: manipulation;
}

#wheel-canvas:focus-visible {
  box-shadow:
    0 36px 80px var(--canvas-shadow),
    0 0 0 3px rgba(255, 225, 163, 0.45),
    0 0 32px var(--panel-glow);
}

.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;
}

@media (max-width: 640px) {
  .page-nav {
    top: 14px;
    gap: 8px;
    padding: 6px;
  }

  .page-link {
    min-width: 78px;
    padding: 9px 14px;
    font-size: 13px;
  }

  .app-shell {
    padding-top: 68px;
  }
}

@media (min-width: 900px) and (min-height: 900px) {
  .page-nav {
    top: 24px;
    gap: 12px;
    padding: 10px;
  }

  .page-link {
    min-width: 108px;
    padding: 12px 20px;
    font-size: 16px;
  }

  .app-shell {
    padding: 88px 28px 28px;
  }
}

@media (min-width: 1000px) and (min-height: 1200px) {
  .page-nav {
    top: 28px;
  }

  .page-link {
    min-width: 118px;
    padding: 13px 24px;
    font-size: 17px;
  }

  .app-shell {
    padding: 98px 32px 32px;
  }
}