:root {
  --bg-top: #0f1226;
  --bg-bottom: #1a1040;
  --panel: rgba(255, 255, 255, 0.06);
  --panel-border: rgba(255, 255, 255, 0.12);
  --text: #f2f0ff;
  --text-dim: #a9a3d4;
  --accent: #7c5cff;
  --accent-2: #ff5c8a;
  --good: #5cffb0;
  --warn: #ffcf5c;
  --danger: #ff5c5c;
  --typed: #5cffb0;
  --remain: #f2f0ff;
}

* { box-sizing: border-box; }

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

body {
  font-family: "Helvetica Neue", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  background: radial-gradient(circle at 50% -10%, var(--bg-bottom), var(--bg-top) 70%);
  color: var(--text);
  display: flex;
  justify-content: center;
  overflow: hidden;
}

#app {
  width: 100%;
  max-width: 900px;
  height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 16px;
}

/* HUD */
#hud {
  display: flex;
  gap: 12px;
  padding: 12px 16px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  backdrop-filter: blur(6px);
  flex-wrap: wrap;
}

.hud-item {
  display: flex;
  flex-direction: column;
  min-width: 70px;
}

.hud-item.lives {
  margin-left: auto;
}

.hud-label {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.hud-value {
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

#combo.hot {
  color: var(--accent-2);
  text-shadow: 0 0 12px rgba(255, 92, 138, 0.7);
}

/* Arena */
#arena {
  position: relative;
  flex: 1;
  margin-top: 16px;
  border-radius: 16px;
  overflow: hidden;
  background:
    linear-gradient(to bottom, rgba(124, 92, 255, 0.05), transparent 60%),
    repeating-linear-gradient(to bottom, rgba(255,255,255,0.02) 0 1px, transparent 1px 40px);
  border: 1px solid var(--panel-border);
}

#arena::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: linear-gradient(to right, var(--accent), var(--accent-2));
  box-shadow: 0 0 20px 2px rgba(255, 92, 138, 0.6);
}

#words-layer {
  position: absolute;
  inset: 0;
}

.word {
  position: absolute;
  top: 0;
  left: 0;
  padding: 6px 12px;
  border-radius: 10px;
  background: rgba(20, 14, 50, 0.75);
  border: 1px solid var(--panel-border);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: box-shadow 0.15s ease, border-color 0.15s ease;
  will-change: transform;
}

.word .typed {
  color: var(--typed);
}

.word .remain {
  color: var(--remain);
}

.word.active {
  border-color: var(--accent);
  box-shadow: 0 0 14px rgba(124, 92, 255, 0.6);
}

.word.cleared {
  animation: pop 0.25s ease forwards;
}

.word.missed {
  animation: sink 0.35s ease forwards;
}

@keyframes pop {
  to { transform: scale(1.6); opacity: 0; }
}

@keyframes sink {
  to { transform: translateY(20px); opacity: 0; }
}

/* Overlays */
.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  text-align: center;
  background: rgba(10, 8, 30, 0.72);
  backdrop-filter: blur(4px);
  padding: 24px;
}

.overlay.hidden {
  display: none;
}

.overlay h1 {
  margin: 0;
  font-size: 28px;
}

.overlay p {
  margin: 0;
  color: var(--text-dim);
  line-height: 1.6;
}

.btn {
  margin-top: 8px;
  padding: 12px 28px;
  font-size: 16px;
  font-weight: 700;
  color: #0f1226;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border: none;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(124, 92, 255, 0.4);
}

.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 24px;
  margin: 8px 0;
}

.result-grid div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  min-width: 180px;
  border-bottom: 1px solid var(--panel-border);
  padding-bottom: 4px;
}

.result-grid span {
  color: var(--text-dim);
}

.result-grid strong {
  font-variant-numeric: tabular-nums;
}

/* Input bar */
#input-bar {
  margin-top: 16px;
}

#typing-input {
  width: 100%;
  padding: 14px 18px;
  font-size: 18px;
  border-radius: 12px;
  border: 1px solid var(--panel-border);
  background: var(--panel);
  color: var(--text);
  outline: none;
}

#typing-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(124, 92, 255, 0.25);
}