:root {
  --bg: #ffffff;
  --fg: #1a1a2e;
  --card-bg: #ffffff;
  --card-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  --accent: #6c63ff;
  --accent-hover: #5a52d5;
  --btn-bg: #f4f4f8;
  --btn-hover-bg: var(--accent);
  --btn-hover-fg: #ffffff;
  --border: #e8e8ee;
  --muted: #6b7280;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f1a;
    --fg: #e4e4ef;
    --card-bg: #1a1a2e;
    --card-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
    --btn-bg: #2a2a3e;
    --border: #2a2a3e;
    --muted: #9ca3af;
  }
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--fg);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

#app {
  width: 100%;
  max-width: 600px;
  padding: 1rem;
}

#progress {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
}

.progress-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
  transition: background 0.3s;
}

.progress-dot.active {
  background: var(--accent);
}

#card {
  background: var(--card-bg);
  border-radius: 16px;
  box-shadow: var(--card-shadow);
  padding: 2.5rem 2rem;
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

#card.fade-out {
  opacity: 0;
  transform: translateY(20px);
}

#card h2 {
  font-size: 1.5rem;
  line-height: 1.4;
  margin-bottom: 1.5rem;
}

#card .body-text {
  line-height: 1.7;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

#card .body-text a {
  color: var(--accent);
  text-decoration: none;
}

#card .body-text a:hover {
  text-decoration: underline;
}

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

.choice-btn {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 1rem 1.25rem;
  background: var(--btn-bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 1rem;
  cursor: pointer;
  text-align: left;
  transition: all 0.2s ease;
}

.choice-btn:hover, .choice-btn:focus {
  background: var(--btn-hover-bg);
  color: var(--btn-hover-fg);
  border-color: var(--accent);
  transform: scale(1.02);
  outline: none;
}

.choice-key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  font-size: 0.8rem;
  font-weight: 600;
  flex-shrink: 0;
}

.choice-btn:hover .choice-key {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #fff;
}

.restart-btn {
  display: inline-block;
  margin-top: 1.5rem;
  padding: 0.75rem 2rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s;
}

.restart-btn:hover {
  background: var(--accent-hover);
}

.back-btn {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.4rem 0;
  background: none;
  border: none;
  color: var(--muted);
  font-size: 0.875rem;
  cursor: pointer;
}

.back-btn:hover {
  color: var(--fg);
}

#error {
  text-align: center;
  padding: 2rem;
}

#error h2 {
  margin-bottom: 1rem;
  color: #ef4444;
}

@media (max-width: 480px) {
  #card {
    padding: 1.5rem 1.25rem;
    border-radius: 12px;
  }
  #card h2 {
    font-size: 1.25rem;
  }
}