:root {
  color-scheme: light;
  --tile-face: #ffffff;
  --tile-edge: #d7d7d7;
  --line: #ff3d4d;
  --ink: #444;
}

* { box-sizing: border-box; }

html,
body {
  width: 100%;
  height: 100%;
}

body {
  margin: 0;
  min-width: 320px;
  overflow: hidden;
  background: #fff;
  font-family: Inter, "Hiragino Sans", "Yu Gothic", system-ui, sans-serif;
}

button { font: inherit; }

.app {
  position: relative;
  width: 100vw;
  height: 100vh;
  background: #fff;
}

.button {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 2;
  min-height: 40px;
  padding: 0 16px;
  border: 1px solid rgba(0, 0, 0, .16);
  border-radius: 999px;
  color: var(--ink);
  background: rgba(255, 255, 255, .82);
  box-shadow: 0 8px 24px rgba(0, 0, 0, .08);
  cursor: pointer;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
  backdrop-filter: blur(8px);
  transition: transform .18s, background .18s, box-shadow .18s;
}

.button:hover {
  background: #fff;
  box-shadow: 0 10px 30px rgba(0, 0, 0, .13);
  transform: translateY(-1px);
}

.button:active { transform: translateY(1px); }

.board {
  width: 100%;
  height: 100%;
}

.board svg {
  display: block;
  width: 100vw;
  height: 100vh;
  background: #fff;
  filter: drop-shadow(0 4px 3px rgba(0, 0, 0, .08));
  touch-action: manipulation;
}

.tile {
  cursor: pointer;
  outline: none;
}

.tile .tile-face {
  fill: var(--tile-face);
  stroke: var(--tile-edge);
  stroke-width: 1.25;
  transition: fill .18s, filter .18s;
}

.tile .track-shadow {
  fill: none;
  stroke: var(--line);
  stroke-width: 8.5;
  stroke-linecap: butt;
}

.tile .track-gap {
  fill: none;
  stroke: var(--tile-face);
  stroke-width: 3.1;
  stroke-linecap: butt;
}

.tile .tile-rotator {
  transform-origin: 0 0;
  transition: transform .24s cubic-bezier(.2, .8, .2, 1);
}

.tile:hover .tile-face,
.tile:focus-visible .tile-face {
  fill: #f5f5f5;
  filter: drop-shadow(0 3px 3px rgba(0, 0, 0, .16));
}

.tile:focus-visible .tile-face {
  stroke: var(--line);
  stroke-width: 2.5;
}

@media (max-width: 650px) {
  .button {
    top: 10px;
    right: 10px;
    min-height: 36px;
    padding: 0 13px;
    font-size: 11px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
  }
}