:root {
  --bg: #1a0b3d;
  --bg2: #2d1b69;
  --panel: rgba(45, 27, 105, 0.72);
  --panel-solid: #241355;
  --ink: #f5f0ff;
  --muted: #b9a7e8;
  --accent: #ff3caf;
  --accent2: #00e5ff;
  --accent3: #ffd23f;
  --accent4: #7dff6b;
  --shadow: 0 4px 22px rgba(0, 0, 0, 0.4);
  --glow: 0 0 16px rgba(255, 60, 175, 0.6);
  font-family:
    'Trebuchet MS',
    system-ui,
    -apple-system,
    'Segoe UI',
    Roboto,
    sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 20% 10%, rgba(255, 60, 175, 0.25), transparent 45%),
    radial-gradient(circle at 85% 20%, rgba(0, 229, 255, 0.22), transparent 40%),
    radial-gradient(circle at 50% 90%, rgba(125, 255, 107, 0.18), transparent 45%),
    linear-gradient(160deg, var(--bg), var(--bg2));
  background-attachment: fixed;
  color: var(--ink);
  -webkit-user-select: none;
  user-select: none;
  touch-action: manipulation;
  min-height: 100vh;
}

#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.level-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 1.35rem;
  background: linear-gradient(90deg, rgba(255, 60, 175, 0.2), rgba(0, 229, 255, 0.2));
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow);
  border-bottom: 2px solid rgba(255, 255, 255, 0.12);
  position: relative;
  z-index: 100;
}

.brand {
  font-weight: 900;
  font-size: 1.35rem;
  letter-spacing: 0.5px;
  background: linear-gradient(90deg, var(--accent3), var(--accent), var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 20px rgba(255, 60, 175, 0.3);
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.4));
}

.level-select {
  margin-left: auto;
  font-size: 1rem;
  padding: 0.4rem 0.6rem;
  border-radius: 10px;
  border: 2px solid var(--accent2);
  background: var(--panel-solid);
  color: var(--ink);
  cursor: pointer;
}
.level-custom-input {
  font-size: 1rem;
  padding: 0.4rem 0.6rem;
  border-radius: 10px;
  border: 2px solid var(--accent3);
  background: var(--panel-solid);
  color: var(--ink);
  min-width: 12rem;
}

.main {
  flex: 1;
  display: flex;
  gap: 1rem;
  padding: 1rem;
  align-items: stretch;
}

.play-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.status {
  min-height: 1.4rem;
  color: var(--accent3);
  font-size: 1rem;
  font-weight: 700;
  text-shadow: 0 0 8px rgba(255, 210, 63, 0.4);
}

.stage-wrap {
  position: relative;
  flex: 1;
  min-height: 240px;
  background:
    radial-gradient(circle at 50% 40%, rgba(0, 229, 255, 0.12), transparent 70%), var(--panel);
  backdrop-filter: blur(6px);
  border-radius: 22px;
  box-shadow:
    var(--shadow),
    inset 0 0 40px rgba(255, 60, 175, 0.08);
  border: 2px solid rgba(255, 255, 255, 0.14);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  overflow: hidden;
}

.stage-wrap::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.toolbar {
  display: flex;
  gap: 0.75rem;
}

.tool-btn {
  font-size: 1rem;
  font-weight: 800;
  padding: 0.65rem 1.15rem;
  border-radius: 12px;
  border: 2px solid rgba(255, 255, 255, 0.2);
  background: linear-gradient(160deg, var(--accent), #c81f86);
  box-shadow:
    var(--shadow),
    0 0 12px rgba(255, 60, 175, 0.4);
  cursor: pointer;
  color: #fff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
  transition:
    transform 100ms ease,
    box-shadow 150ms ease,
    filter 150ms ease;
}

.tool-btn:hover {
  filter: brightness(1.15);
  box-shadow:
    var(--shadow),
    0 0 20px rgba(255, 60, 175, 0.7);
}

.tool-btn:active {
  transform: translateY(2px) scale(0.97);
}

.history {
  width: 260px;
  background: var(--panel);
  backdrop-filter: blur(6px);
  border-radius: 22px;
  box-shadow: var(--shadow);
  border: 2px solid rgba(255, 255, 255, 0.12);
  padding: 1rem;
  overflow-y: auto;
  max-height: 70vh;
}

.history-title {
  font-weight: 900;
  margin-bottom: 0.5rem;
  color: var(--accent2);
  text-shadow: 0 0 10px rgba(0, 229, 255, 0.4);
  letter-spacing: 0.5px;
}

.history-row {
  display: flex;
  justify-content: space-between;
  padding: 0.55rem 0.7rem;
  border-radius: 10px;
  cursor: pointer;
  font-size: 0.95rem;
  margin-bottom: 0.3rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: background 150ms ease;
}

.history-row:hover {
  background: rgba(0, 229, 255, 0.18);
}

.history-expr {
  font-weight: 700;
  color: var(--ink);
}

.history-verb {
  color: var(--accent3);
  font-style: italic;
}

.solved-banner {
  margin-top: 0.75rem;
  padding: 0.9rem 1.1rem;
  background: linear-gradient(135deg, rgba(125, 255, 107, 0.25), rgba(0, 229, 255, 0.25));
  border: 2px solid var(--accent4);
  border-radius: 16px;
  color: var(--accent4);
  box-shadow: 0 0 24px rgba(125, 255, 107, 0.4);
  animation: banner-pop 400ms ease;
}

@keyframes banner-pop {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.solved-title {
  font-weight: 900;
  font-size: 1.2rem;
  text-shadow: 0 0 12px rgba(125, 255, 107, 0.5);
}

.solved-stars .star {
  font-size: 1.9rem;
  color: rgba(255, 255, 255, 0.25);
}

.solved-stars .star.earned {
  color: var(--accent3);
  text-shadow: 0 0 14px rgba(255, 210, 63, 0.8);
  animation: star-spin 600ms ease;
}

@keyframes star-spin {
  from {
    transform: rotate(-180deg) scale(0);
  }
  to {
    transform: rotate(0) scale(1);
  }
}

.error-note {
  margin-top: 0.4rem;
  color: #ff8080;
  font-size: 0.9rem;
  font-weight: 700;
  text-shadow: 0 0 8px rgba(255, 60, 60, 0.4);
}
/* Settings menu */
.settings {
  position: relative;
}
.settings-panel {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  z-index: 200;
  min-width: 260px;
  background: var(--panel-solid);
  border: 2px solid var(--accent2);
  border-radius: 16px;
  box-shadow:
    0 8px 28px rgba(0, 0, 0, 0.5),
    0 0 20px rgba(0, 229, 255, 0.3);
  padding: 1rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  animation: settings-pop 140ms ease;
}
@keyframes settings-pop {
  from {
    opacity: 0;
    transform: translateY(-6px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}
.settings-title {
  font-weight: 900;
  color: var(--accent2);
  font-size: 1.1rem;
  border-bottom: 2px solid rgba(0, 229, 255, 0.3);
  padding-bottom: 0.5rem;
  text-shadow: 0 0 10px rgba(0, 229, 255, 0.4);
}
.settings-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  cursor: pointer;
}
.settings-label {
  min-width: 5rem;
  color: var(--muted);
}
.settings-difficulty {
  flex: 1;
  font-size: 0.95rem;
  padding: 0.4rem 0.5rem;
  border-radius: 8px;
  border: 2px solid var(--accent);
  background: var(--panel);
  color: var(--ink);
}
.settings-input {
  background: var(--panel);
  color: var(--ink);
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
}
.settings-row input[type='checkbox'] {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--accent);
}
@media (prefers-reduced-motion: reduce) {
  .settings-panel,
  .solved-banner,
  .solved-stars .star.earned {
    animation: none;
  }
}

@media (max-width: 720px) {
  .main {
    flex-direction: column;
  }

  .history {
    width: auto;
  }
}