:root { color-scheme: dark; }

* { box-sizing: border-box; touch-action: manipulation; }

html, body {
  margin: 0; padding: 0;
  height: 100dvh;
  overflow: hidden;
  background: #0a0a0a;
  color: #f5f5f5;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Apple SD Gothic Neo", "Noto Sans KR", "Noto Sans JP", "Noto Sans SC", sans-serif;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  -webkit-user-select: none;
  overscroll-behavior: none;
}

main {
  height: 100%;
  max-width: 480px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  padding:
    max(60px, env(safe-area-inset-top))
    16px
    max(20px, env(safe-area-inset-bottom));
  gap: 12px;
}

.score-bar { display: flex; gap: 8px; align-items: stretch; }
.score-box {
  flex: 1; background: #161616; border: 1px solid #2a2a2a; border-radius: 12px;
  padding: 8px 6px; text-align: center; min-width: 0;
}
.score-label {
  display: block; font-size: 10px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.06em; color: #a0a0a0; white-space: nowrap;
}
.score-val, .best-val, .time-val {
  display: block; font-size: 20px; font-weight: 800;
  font-variant-numeric: tabular-nums; letter-spacing: -0.02em;
  color: #f5f5f5; margin-top: 2px; line-height: 1.1;
  white-space: nowrap;
}
.time-val { color: #f0c440; }
.time-val.low { color: #ff5a72; }
.new-btn {
  flex: 0 0 auto; font: inherit; color: #fff; background: #4f9eff;
  border: none; border-radius: 12px; padding: 0 14px; min-height: 56px;
  cursor: pointer; font-weight: 700; font-size: 13px;
  -webkit-tap-highlight-color: transparent;
}
.new-btn:active { background: #3d8ae8; }

.prompt-area {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: #161616;
  border: 1px solid #2a2a2a;
  border-radius: 18px;
  padding: 24px 16px;
  text-align: center;
}
.prompt-word {
  font-size: clamp(56px, 18vw, 110px);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1;
  transition: transform 80ms ease;
}
.prompt-word.flash-correct { animation: flashGreen 220ms ease; }
.prompt-word.flash-wrong { animation: flashRed 220ms ease; }
@keyframes flashGreen {
  0% { transform: scale(1); }
  40% { transform: scale(1.08); }
  100% { transform: scale(1); }
}
@keyframes flashRed {
  0% { transform: translateX(0); }
  25% { transform: translateX(-8px); }
  50% { transform: translateX(8px); }
  75% { transform: translateX(-4px); }
  100% { transform: translateX(0); }
}
.prompt-hint {
  font-size: 13px;
  color: #888;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.color-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  flex: 0 0 auto;
}
.color-buttons button {
  height: 78px;
  border: 2px solid rgba(255, 255, 255, 0.10);
  border-radius: 16px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: transform 60ms ease, border-color 100ms ease;
  font: inherit;
  color: transparent;
}
.color-buttons button:active {
  transform: scale(0.94);
  border-color: rgba(255, 255, 255, 0.45);
}
.color-buttons button[data-color="red"]    { background: #e85044; }
.color-buttons button[data-color="blue"]   { background: #4f9eff; }
.color-buttons button[data-color="green"]  { background: #56c46a; }
.color-buttons button[data-color="yellow"] { background: #f0c440; }

.home-link, .hof-link {
  position: fixed;
  top: max(12px, env(safe-area-inset-top));
  z-index: 10;
  width: 40px; height: 40px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.35);
  color: #fff;
  text-decoration: none;
  font-size: 20px; font-weight: 600; line-height: 1;
  border: none; cursor: pointer; font-family: inherit;
  -webkit-tap-highlight-color: transparent;
  backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
}
.home-link { left: max(12px, env(safe-area-inset-left)); }
.hof-link { right: max(12px, env(safe-area-inset-right)); }

@media (hover: hover) {
  .home-link:hover, .hof-link:hover { background: rgba(0, 0, 0, 0.55); }
}

.overlay {
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex; align-items: center; justify-content: center;
  z-index: 60; padding: 20px;
  backdrop-filter: blur(2px); -webkit-backdrop-filter: blur(2px);
}
.overlay[hidden] { display: none; }
.overlay-card {
  background: #161616; border: 1px solid #2a2a2a; border-radius: 18px;
  padding: 24px 22px;
  display: flex; flex-direction: column; gap: 12px; align-items: center;
  text-align: center;
  min-width: 240px; max-width: 320px; width: 100%;
}
.overlay-card h2 {
  margin: 0; font-size: 22px; font-weight: 800; letter-spacing: -0.02em;
}
.overlay-card .sub { margin: 0; font-size: 13px; color: #a0a0a0; }
.overlay-score {
  margin: 0; font-size: 56px; font-weight: 800;
  font-variant-numeric: tabular-nums; letter-spacing: -0.04em; line-height: 1;
}
.overlay-card button {
  font: inherit; color: #fff;
  background: rgba(255, 255, 255, 0.10);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  padding: 12px 20px; min-height: 44px; cursor: pointer;
  font-weight: 600; font-size: 14px;
  width: 100%;
  -webkit-tap-highlight-color: transparent;
}
.overlay-card button:active { background: rgba(255, 255, 255, 0.18); }
.overlay-card .save-btn { background: #4f9eff; border-color: #4f9eff; }
.overlay-card .save-btn:active { background: #3d8ae8; }