:root {
  --bg: #0b0e14;
  --panel: #131722;
  --border: #232838;
  --text: #d7dbe6;
  --text-dim: #7a8299;
  --green: #26a69a;
  --red: #ef5350;
  --accent: #f0b90b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "SF Mono", "Cascadia Code", Consolas, "Courier New", monospace;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 24px 16px 48px;
}

.app {
  width: 100%;
  max-width: 900px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.app-header {
  text-align: center;
  position: relative;
}

.lang-select {
  position: absolute;
  top: 0;
  right: 0;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: inherit;
  font-size: 0.8rem;
  padding: 4px 6px;
  cursor: pointer;
}

.app-header h1 {
  margin: 0 0 6px;
  font-size: 1.6rem;
  letter-spacing: 0.5px;
}

.accent {
  color: var(--accent);
}

.subtitle {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.stat {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 8px;
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 1.4rem;
  font-weight: 700;
}

.stat-label {
  display: block;
  font-size: 0.7rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 2px;
}

.btn-reset {
  display: block;
  margin: 0 auto;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: inherit;
  font-size: 0.75rem;
  padding: 6px 14px;
  border-radius: 8px;
  cursor: pointer;
}

.btn-reset:hover {
  color: var(--red);
  border-color: var(--red);
}

#game-view {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

#game-view[hidden] {
  display: none;
}

.round-progress {
  text-align: center;
  margin: 0;
  color: var(--text-dim);
  font-size: 0.8rem;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.chart-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  position: relative;
}

.chart-status {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  padding: 8px 0;
}

#chart {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 6px;
}

.decision-hint {
  text-align: center;
  font-size: 0.75rem;
  color: var(--accent);
  margin-top: 6px;
}

.controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.btn {
  font-family: inherit;
  font-size: 1.1rem;
  font-weight: 700;
  padding: 16px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  transition: transform 0.08s ease, opacity 0.15s ease;
}

.btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.btn:not(:disabled):active {
  transform: scale(0.97);
}

.btn-up {
  background: var(--green);
  color: #06231f;
}

.btn-down {
  background: var(--red);
  color: #2a0b0a;
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 16px;
  font-size: 0.85rem;
  font-weight: 600;
}

.result-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  text-align: center;
}

.result-text {
  margin: 0 0 4px;
  font-size: 1.3rem;
  font-weight: 700;
}

.result-text.win {
  color: var(--green);
}

.result-text.lose {
  color: var(--red);
}

.result-detail {
  margin: 0 0 14px;
  color: var(--text-dim);
  font-size: 0.85rem;
}

.result-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

.daily-complete {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px 16px;
  text-align: center;
}

.daily-complete h2 {
  margin: 0 0 10px;
  font-size: 1.3rem;
  color: var(--accent);
}

.daily-score {
  margin: 0 0 8px;
  font-size: 1.1rem;
  font-weight: 700;
}

.daily-squares {
  margin: 0 0 12px;
  font-size: 1.6rem;
  letter-spacing: 4px;
}

.daily-countdown {
  margin: 0 0 16px;
  color: var(--text-dim);
  font-size: 0.85rem;
}

.app-footer {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.7rem;
  margin-top: 8px;
}

@media (max-width: 520px) {
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }
  .app-header h1 {
    font-size: 1.3rem;
  }
}