:root {
  --ink: #f4fbfa;
  --glass: rgb(12 22 21 / 0.62);
  --glass-line: rgb(255 255 255 / 0.14);
  --brand: #2dd4bf;
  --bg: #0b1211;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body { margin: 0; height: 100%; overflow: hidden; background: var(--bg); color: var(--ink); }
body { font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }

.stage { position: fixed; inset: 0; }
.stage video, .stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.stage video { object-fit: cover; transform: scaleX(-1); opacity: 0.35; transition: opacity 200ms; }
.stage video.hidden { opacity: 0; }
#scene { touch-action: none; }
#hud { pointer-events: none; }

.bar {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 8px 10px;
  max-width: calc(100vw - 24px);
  overflow-x: auto;
  border-radius: 22px;
  background: var(--glass);
  border: 1px solid var(--glass-line);
  backdrop-filter: blur(10px);
  z-index: 2;
}

.home { display: grid; place-items: center; }
.group { display: flex; gap: 6px; padding-left: 10px; border-left: 1px solid var(--glass-line); }

.tool {
  position: relative;
  width: 54px;
  height: 54px;
  border-radius: 16px;
  border: 1px solid var(--glass-line);
  background: rgb(255 255 255 / 0.06);
  color: var(--ink);
  font-size: 24px;
  display: grid;
  place-items: center;
  cursor: pointer;
  flex: none;
}
.tool[aria-pressed="true"] { background: rgb(45 212 191 / 0.28); border-color: var(--brand); }
.tool.swatch { border-radius: 50%; width: 40px; height: 40px; border: 3px solid rgb(255 255 255 / 0.3); }
.tool.swatch[aria-pressed="true"] { border-color: #fff; transform: scale(1.12); }
.tool.hover { box-shadow: 0 0 0 3px var(--brand); }
.tool:focus-visible { outline: 3px solid var(--brand); outline-offset: 2px; }

.hint {
  position: absolute;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  margin: 0;
  padding: 8px 16px;
  border-radius: 999px;
  background: var(--glass);
  border: 1px solid var(--glass-line);
  font-size: 15px;
  text-align: center;
  max-width: calc(100vw - 32px);
  z-index: 2;
}
.hint:empty { display: none; }

.score {
  position: absolute;
  top: 92px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 40px;
  font-weight: 800;
  text-shadow: 0 2px 16px rgb(0 0 0 / 0.5);
  z-index: 2;
  text-align: center;
}
.score[hidden] { display: none; }
.score small { display: block; font-size: 16px; font-weight: 500; opacity: 0.8; }

.gate {
  position: absolute;
  inset: 0;
  z-index: 3;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 10px;
  padding: 24px 16px;
  text-align: center;
  background: radial-gradient(circle at 50% 35%, #134e48, var(--bg) 70%);
}
.gate[hidden] { display: none; }
.gate h1 { margin: 0; font-size: 44px; letter-spacing: -0.02em; }
.gate p { margin: 0; max-width: 460px; color: #b9d6d0; }
.gate .small { font-size: 14px; }
.guide { list-style: none; padding: 0; margin: 10px 0; display: grid; gap: 8px; text-align: left; }
.guide li { display: flex; gap: 12px; align-items: center; }
.guide b { font-size: 26px; width: 36px; text-align: center; }
.gate button {
  font: inherit;
  font-size: 18px;
  font-weight: 700;
  padding: 14px 28px;
  border-radius: 14px;
  border: 0;
  background: var(--brand);
  color: #04201d;
  cursor: pointer;
}
.gate button:disabled { opacity: 0.6; cursor: wait; }