:root {
  color-scheme: light;
  --bg: #f6f7fb;
  --panel-bg: #0e233d;
  --panel-text: #f8fbff;
  --primary: #1363b0;
  --primary-dark: #0c3f75;
  --accent: #f16c20;
  --success: rgba(12, 190, 74, 0.85);
  --error: rgba(192, 41, 0, 0.8);
  --muted: rgba(0, 0, 0, 0.45);
  --transition: 200ms ease-in-out;
  font-family: "Inter", "Segoe UI", sans-serif;
}

*, *::before, *::after {
  box-sizing: border-box;
}

[v-cloak] {
  display: none !important;
}

body {
  margin: 0;
  background: var(--bg);
  color: #10121a;
  min-height: 100vh;
  overflow: hidden;
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

.nav-toggle {
  position: fixed;
  top: 1.5rem;
  left: 1.5rem;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0.35rem;
  border-radius: 0.75rem;
  background: rgba(14, 35, 61, 0.85);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.4rem;
  z-index: 20;
  transition: var(--transition);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  background: rgba(19, 99, 176, 0.9);
}

.nav-toggle-bar {
  height: 2px;
  width: 100%;
  border-radius: 999px;
  background: #fff;
}

.app-shell {
  display: flex;
  min-height: 100vh;
  transition: transform var(--transition);
}

.settings-panel {
  width: min(320px, 85vw);
  background: var(--panel-bg);
  color: var(--panel-text);
  padding: 4.5rem 1.75rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
  position: fixed;
  inset: 0 auto 0 -100%;
  transform: translateX(-100%);
  transition: transform var(--transition);
  overflow-y: auto;
  z-index: 15;
}

.app-shell.nav-open .settings-panel {
  transform: translateX(0);
}

.panel-header h1 {
  margin: 0;
  font-size: 1.75rem;
  letter-spacing: 0.04em;
}

.panel-subtitle {
  margin: 0.5rem 0 0;
  color: rgba(248, 251, 255, 0.75);
  font-size: 0.95rem;
}

.settings-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.slider-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.slider-label span {
  color: rgba(248, 251, 255, 0.75);
  font-size: 0.95rem;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.25);
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid rgba(255, 255, 255, 0.25);
  transition: transform var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.08);
}

select {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 0.65rem;
  padding: 0.6rem 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: inherit;
}

select:focus-visible,
input[type="range"]:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.65);
  outline-offset: 2px;
}

.instructions h2 {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
}

.instructions p {
  margin: 0;
  color: rgba(248, 251, 255, 0.65);
  font-size: 0.95rem;
  line-height: 1.4;
}

.play-area {
  flex: 1;
  margin-left: 0;
  padding: 4.5rem 1.5rem 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2.5rem;
  width: 100%;
}

.status-bar {
  width: min(90vw, 600px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.chart-button {
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: rgba(19, 99, 176, 0.15);
  color: var(--primary);
  font-size: 1.35rem;
  line-height: 1;
  transition: var(--transition);
  border: 1px solid rgba(19, 99, 176, 0.35);
}

.chart-button:hover,
.chart-button:focus-visible {
  background: var(--primary);
  color: #fff;
}

.stimuli-counter {
  flex: 1;
  text-align: center;
  font-size: clamp(2.5rem, 7vw, 3.5rem);
  font-weight: 700;
  color: var(--muted);
}

.progress-track {
  position: relative;
  width: min(25vw, 220px);
  height: 0.75rem;
  background: rgba(16, 18, 26, 0.08);
  border-radius: 999px;
  overflow: hidden;
}

.progress-bar {
  position: absolute;
  inset: 0;
  background: var(--accent);
  border-radius: 999px;
  transition: width 300ms ease;
}

.grid {
  width: min(90vw, 520px);
  aspect-ratio: 1 / 1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 0.75rem;
}

.grid-cell {
  position: relative;
  background: rgba(19, 99, 176, 0.25);
  border-radius: 18%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), transform var(--transition);
}

.grid-cell.center {
  background: transparent;
  border: 2px dashed rgba(16, 18, 26, 0.15);
}

.grid-cell.active {
  background: var(--accent);
  transform: scale(1.03);
}

.grid-center {
  color: rgba(16, 18, 26, 0.3);
  font-weight: 700;
  letter-spacing: 0.1em;
}

.controls {
  width: min(90vw, 520px);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: stretch;
}

.engine-button {
  padding: 1rem 1.75rem;
  border-radius: 0.85rem;
  font-weight: 600;
  font-size: 1.05rem;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  transition: var(--transition);
}

.engine-button:hover,
.engine-button:focus-visible {
  filter: brightness(1.1);
}

.action-buttons {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.action-button {
  padding: 1.1rem 1.5rem;
  border-radius: 0.85rem;
  background: rgba(16, 18, 26, 0.08);
  font-size: 1.05rem;
  font-weight: 600;
  transition: transform var(--transition), background var(--transition), color var(--transition);
}

.action-button:hover,
.action-button:focus-visible {
  transform: translateY(-2px);
  background: rgba(19, 99, 176, 0.2);
}

.action-button.feedback-right {
  background: rgba(12, 190, 74, 0.25);
  color: #0cbe4a;
}

.action-button.feedback-wrong {
  background: rgba(192, 41, 0, 0.2);
  color: #c02900;
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(4, 11, 20, 0.65);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  z-index: 50;
}

.overlay-content {
  position: relative;
  background: #fff;
  color: #10121a;
  border-radius: 1.25rem;
  padding: 2.5rem;
  width: min(90vw, 520px);
  box-shadow: 0 24px 60px rgba(4, 11, 20, 0.28);
}

.overlay-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background: rgba(16, 18, 26, 0.05);
  font-size: 1.35rem;
  line-height: 1;
  transition: var(--transition);
}

.overlay-close:hover,
.overlay-close:focus-visible {
  background: rgba(16, 18, 26, 0.1);
}

.overlay-title {
  margin: 0 0 1.5rem;
  text-align: center;
}

.results-table table {
  width: 100%;
  border-collapse: collapse;
  font-size: 1.1rem;
}

.results-table th {
  padding: 0.75rem 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.85rem;
  color: rgba(16, 18, 26, 0.55);
}

.results-table td {
  padding: 0.6rem 0.5rem;
  text-align: center;
  font-weight: 600;
}

.overlay-message {
  margin: 1.5rem 0 0;
  text-align: center;
  font-weight: 600;
  color: var(--primary-dark);
}

.chart-container {
  width: 100%;
  min-height: 320px;
}

.fade-enter-active,
.fade-leave-active {
  transition: opacity 200ms ease;
}

.fade-enter-from,
.fade-leave-to {
  opacity: 0;
}

@media (min-width: 960px) {
  body {
    overflow: auto;
  }

  .nav-toggle {
    display: none;
  }

  .settings-panel {
    position: static;
    transform: translateX(0);
    width: clamp(280px, 28vw, 340px);
    padding: 3.5rem 2.25rem 2.5rem;
    box-shadow: 12px 0 40px rgba(4, 11, 20, 0.12);
  }

  .app-shell {
    transform: none !important;
  }

  .play-area {
    padding: 3.5rem clamp(3rem, 6vw, 6rem);
    align-items: center;
  }

  .grid {
    width: clamp(420px, 50vmin, 540px);
  }

  .status-bar {
    width: clamp(420px, 50vmin, 540px);
  }

  .controls {
    width: clamp(420px, 50vmin, 540px);
  }
}

@media (max-width: 640px) {
  .play-area {
    padding: 5.5rem 1rem 2.5rem;
    gap: 2rem;
  }

  .status-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .progress-track {
    width: 100%;
  }

  .chart-button {
    align-self: flex-end;
  }
}