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

:root {
  --bg: #0c0a09;
  --fg: #f5f5f4;
  --accent: #34d399;
  --accent2: #22d3ee;
  --card-bg: rgba(255, 255, 255, 0.05);
  --card-border: rgba(52, 211, 153, 0.3);
}

body.light {
  --bg: #fafaf9;
  --fg: #1c1917;
  --card-bg: rgba(0, 0, 0, 0.03);
  --card-border: rgba(16, 185, 129, 0.4);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--fg);
  min-height: 100vh;
  transition: background 0.3s, color 0.3s;
}

nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--card-border);
  background: var(--card-bg);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
  flex-wrap: wrap;
}

nav a {
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  text-decoration: none;
  color: var(--fg);
  font-weight: 600;
  font-size: 0.9rem;
  transition: background 0.15s;
}

nav a:hover { background: var(--card-bg); }
nav a.active {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: var(--bg);
}

nav button {
  margin-left: auto;
  background: none;
  border: 1px solid var(--card-border);
  color: var(--fg);
  cursor: pointer;
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
}

h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

h2 { font-size: 1.1rem; margin-bottom: 0.5rem; color: var(--accent); }
.lead { color: var(--fg); opacity: 0.7; margin-bottom: 1.5rem; }
.lead-big { font-size: 1.5rem; font-weight: 700; }

.card,
.game-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 1.2rem;
  margin-bottom: 1rem;
  text-decoration: none;
  color: inherit;
  display: block;
  transition: transform 0.15s, border-color 0.15s;
}

.game-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
}

.game-icon {
  font-size: 2.2rem;
  margin-bottom: 0.4rem;
}

.hi-score {
  font-size: 0.85rem;
  opacity: 0.6;
  margin-top: 0.5rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.scoreboard {
  font-size: 1rem;
  margin: 1rem 0;
}

.scoreboard strong {
  color: var(--accent);
  font-size: 1.2rem;
}

button {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: var(--bg);
  border: none;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  font-weight: 700;
  cursor: pointer;
  font-size: 1rem;
  margin: 0.6rem 0;
}

button:active { transform: scale(0.96); }

canvas {
  display: block;
  margin: 1rem auto;
  border: 2px solid var(--card-border);
  border-radius: 8px;
  background: var(--bg);
}

/* 打地鼠 grid */
.whack-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.6rem;
  max-width: 360px;
  margin: 1rem auto;
}

.hole {
  aspect-ratio: 1;
  background: var(--card-bg);
  border: 2px dashed var(--card-border);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.4rem;
  cursor: pointer;
  user-select: none;
}

.hole.active::before {
  content: '🐹';
  animation: pop 0.3s ease-out;
}

@keyframes pop {
  0% { transform: scale(0); }
  60% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

/* 记忆翻牌 grid */
.memory-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.6rem;
  max-width: 360px;
  margin: 1rem auto;
}

.card-flip {
  aspect-ratio: 3 / 4;
  font-size: 2rem;
  cursor: pointer;
  background: var(--card-bg);
  border: 2px solid var(--card-border);
  border-radius: 12px;
  color: var(--fg);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 0;
}

.card-flip.flipped {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: var(--bg);
}

.hint {
  margin-top: 2rem;
  opacity: 0.6;
  font-style: italic;
  font-size: 0.9rem;
}

/* 聊天界面 */
.chat-box {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 1rem;
  height: 360px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 0.8rem;
}

.msg {
  max-width: 80%;
  padding: 0.5rem 0.9rem;
  border-radius: 12px;
  font-size: 0.95rem;
  line-height: 1.4;
  word-break: break-word;
}

.msg.user {
  align-self: flex-end;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: var(--bg);
  border-bottom-right-radius: 4px;
}

.msg.ai {
  align-self: flex-start;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  color: var(--fg);
  border-bottom-left-radius: 4px;
}

.chat-input-row {
  display: flex;
  gap: 0.5rem;
}

.chat-input-row input {
  flex: 1;
  padding: 0.6rem 0.9rem;
  border-radius: 8px;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  color: var(--fg);
  font-size: 1rem;
  outline: none;
}

.chat-input-row input:focus {
  border-color: var(--accent);
}

.chat-input-row button {
  margin: 0;
  white-space: nowrap;
}