:root {
  --color-background: #0f172a;
  --color-surface: #1e293b;
  --color-surface-elevated: rgba(30, 41, 59, 0.78);
  --color-border: rgba(148, 163, 184, 0.18);
  --color-text-primary: #f8fafc;
  --color-text-secondary: #94a3b8;
  --color-danger: #ef4444;
  --color-success: #22c55e;
  --color-highlight: #3b82f6;
  --color-shadow: rgba(2, 6, 23, 0.55);

  --color-rating-top: #22c55e;
  --color-rating-above: #60a5fa;
  --color-rating-average: #e2e8f0;
  --color-rating-below: #f59e0b;
  --color-rating-neutral: #94a3b8;

  --font-ui: "Inter", sans-serif;
  --font-mono: "JetBrains Mono", monospace;

  --transition-fast: 160ms ease;
  --transition-medium: 240ms ease;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  font-family: var(--font-ui);
  background:
    radial-gradient(circle at top, rgba(59, 130, 246, 0.1), transparent 30%),
    linear-gradient(180deg, #0b1220 0%, var(--color-background) 100%);
  color: var(--color-text-primary);
}

button,
input,
textarea,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.app-card {
  width: min(1180px, 100%);
  display: grid;
  grid-template-columns: 1.5fr 0.8fr;
  gap: 20px;
  align-items: stretch;
}

.scene-panel,
.control-panel {
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid var(--color-border);
  box-shadow: 0 24px 80px var(--color-shadow);
  backdrop-filter: blur(16px);
}

.scene-panel {
  position: relative;
  border-radius: 28px;
  padding: 20px;
  min-height: 720px;
  overflow: hidden;
}

.scene-root {
  position: absolute;
  inset: 20px;
  border-radius: 24px;
  overflow: hidden;
}

.reaction-zone {
  position: absolute;
  inset: 20px;
  z-index: 1;
  border-radius: 24px;
  border: 1px solid rgba(248, 250, 252, 0.08);
  background: rgba(15, 23, 42, 0.22);
  outline: none;
  transition:
    border-color var(--transition-medium),
    background var(--transition-medium),
    box-shadow var(--transition-medium);
}

.reaction-zone:hover {
  border-color: rgba(248, 250, 252, 0.16);
}

.reaction-zone:focus-visible {
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.35);
  border-color: rgba(59, 130, 246, 0.65);
}

.reaction-zone.is-idle {
  background: rgba(15, 23, 42, 0.22);
}

.reaction-zone.is-waiting {
  background: linear-gradient(
    180deg,
    rgba(239, 68, 68, 0.08),
    rgba(15, 23, 42, 0.22)
  );
}

.reaction-zone.is-ready {
  background: linear-gradient(
    180deg,
    rgba(34, 197, 94, 0.12),
    rgba(15, 23, 42, 0.22)
  );
  border-color: rgba(34, 197, 94, 0.35);
  box-shadow: inset 0 0 0 1px rgba(34, 197, 94, 0.18);
}

.reaction-zone.is-result {
  background: linear-gradient(
    180deg,
    rgba(59, 130, 246, 0.08),
    rgba(15, 23, 42, 0.22)
  );
}

.reaction-zone.is-false-start {
  background: linear-gradient(
    180deg,
    rgba(239, 68, 68, 0.1),
    rgba(15, 23, 42, 0.22)
  );
}

.scene-ui-layer {
  position: absolute;
  inset: 20px;
  z-index: 2;
  padding: 24px;
  pointer-events: none;
}

.scene-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 20px;
}

.instruction-panel {
  max-width: 500px;
}

.instruction-label {
  margin: 0 0 8px;
  color: var(--color-text-secondary);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.instruction-text {
  margin: 0;
  color: var(--color-text-primary);
  font-size: 1rem;
  line-height: 1.45;
  font-weight: 500;
}

.result-panel {
  text-align: right;
  min-width: 240px;
}

.result-label {
  margin: 0 0 10px;
  color: var(--color-text-secondary);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.reaction-value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(2.6rem, 7vw, 5.4rem);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.05em;
}

.reaction-rating {
  margin: 10px 0 0;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.rating-top {
  color: var(--color-rating-top);
}

.rating-above {
  color: var(--color-rating-above);
}

.rating-average {
  color: var(--color-rating-average);
}

.rating-below {
  color: var(--color-rating-below);
}

.rating-neutral {
  color: var(--color-rating-neutral);
}

.scene-bottom-bar {
  position: absolute;
  right: 24px;
  bottom: 24px;
  display: flex;
  justify-content: flex-end;
  align-items: flex-end;
  gap: 16px;
  pointer-events: none;
}

.secondary-button {
  pointer-events: auto;
  border: none;
  border-radius: 16px;
  min-height: 52px;
  padding: 0 18px;
  font-weight: 700;
  transition:
    transform var(--transition-fast),
    opacity var(--transition-fast),
    box-shadow var(--transition-fast),
    background var(--transition-fast);
  background: rgba(148, 163, 184, 0.08);
  color: var(--color-text-primary);
  border: 1px solid rgba(148, 163, 184, 0.16);
  min-width: 112px;
}

.secondary-button:hover {
  transform: translateY(-1px);
}

.secondary-button:active {
  transform: translateY(0);
}

.control-panel {
  border-radius: 28px;
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.stat-card {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: 18px;
  padding: 16px;
}

.stat-card-full {
  grid-column: 1 / -1;
}

.stat-label {
  margin: 0 0 8px;
  color: var(--color-text-secondary);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.stat-value {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.mono {
  font-family: var(--font-mono);
}

.micro-copy {
  margin-top: auto;
  padding: 16px 18px;
  border-radius: 18px;
  background: rgba(15, 23, 42, 0.52);
  border: 1px solid var(--color-border);
}

.micro-copy p {
  margin: 0;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.status-idle {
  color: var(--color-text-primary);
}

.status-waiting {
  color: #fecaca;
}

.status-ready {
  color: #bbf7d0;
}

.status-result {
  color: #bfdbfe;
}

.status-false-start {
  color: #fecaca;
}

@media (max-width: 980px) {
  .app-card {
    grid-template-columns: 1fr;
  }

  .scene-panel {
    min-height: 620px;
  }
}

@media (max-width: 640px) {
  .app-shell {
    padding: 14px;
  }

  .scene-panel,
  .control-panel {
    border-radius: 22px;
  }

  .scene-panel {
    padding: 14px;
    min-height: 600px;
  }

  .scene-root,
  .reaction-zone,
  .scene-ui-layer {
    inset: 14px;
  }

  .scene-ui-layer {
    padding: 18px;
  }

  .scene-top-bar {
    flex-direction: column;
    align-items: flex-start;
  }

  .result-panel {
    text-align: left;
    min-width: unset;
  }

  .scene-bottom-bar {
    right: 18px;
    bottom: 18px;
  }
}