/* === 全局防横向滚动溢出 === */
html, body { overflow-x: hidden; max-width: 100%; }
img, video, canvas, svg { max-width: 100%; }
* { box-sizing: border-box; }

/* ═══════════════════════════════════════════════════════════════════
   game-core.css · 游戏核心工具样式 v1.0
   ═══════════════════════════════════════════════════════════════════ */

/* ─── Confetti 彩纸 ─── */
.g-confetti-container {
  position: fixed; inset: 0; pointer-events: none;
  z-index: 9999; overflow: hidden;
}
.g-confetti-piece {
  position: absolute; top: -20px;
  border-radius: 2px;
  opacity: 0.9;
  will-change: transform, opacity;
}

/* ─── Achievement Toast ─── */
.g-achievement-toast {
  position: fixed; top: 20px; left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #ffd700, #ff6b6b);
  color: white;
  padding: 1rem 1.5rem;
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
  z-index: 9999;
  font-weight: 600;
  text-align: center;
  max-width: 90vw;
  pointer-events: none;
}

/* ─── Tutorial Modal ─── */
.g-tutorial-btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.4rem 0.8rem;
  background: var(--bg-alt, #f5f5f5);
  border: 1px solid var(--border, #ddd);
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  margin: 0.5rem 0;
  transition: all 0.2s;
}
.g-tutorial-btn:hover {
  background: var(--primary, #4f46e5);
  color: white;
  border-color: var(--primary, #4f46e5);
}

.g-tutorial-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 10000;
  display: flex; align-items: center; justify-content: center;
  padding: 1rem;
  backdrop-filter: blur(4px);
}
.g-tutorial-modal {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  max-width: 420px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  animation: gTutorialIn 0.3s ease-out;
}
@keyframes gTutorialIn {
  from { opacity: 0; transform: translateY(20px) scale(0.95); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.g-tutorial-modal h2 {
  margin: 0 0 1rem;
  font-size: 1.25rem;
  color: var(--primary, #4f46e5);
}
.g-tutorial-steps {
  min-height: 200px;
  margin: 1rem 0;
}
.g-tutorial-step {
  text-align: center;
}
.g-tutorial-icon {
  font-size: 4rem;
  margin-bottom: 0.5rem;
}
.g-tutorial-step h3 {
  margin: 0.5rem 0;
  font-size: 1.1rem;
}
.g-tutorial-step p {
  margin: 0;
  color: var(--text-light, #666);
  line-height: 1.6;
}
.g-tutorial-nav {
  display: flex; align-items: center; gap: 0.5rem;
  border-top: 1px solid var(--border, #eee);
  padding-top: 1rem;
}
.g-tutorial-progress {
  flex: 1;
  color: var(--text-light, #888);
  font-size: 0.85rem;
}
.g-btn {
  padding: 0.5rem 1rem;
  background: transparent;
  border: 1px solid var(--border, #ddd);
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text, #333);
}
.g-btn:hover {
  background: var(--bg-alt, #f5f5f5);
}
.g-btn-primary {
  background: var(--primary, #4f46e5);
  color: white;
  border-color: var(--primary, #4f46e5);
}
.g-btn-primary:hover {
  background: #3730a3;
}

/* ─── 暗色模式 ─── */
@media (prefers-color-scheme: dark) {
  .g-tutorial-modal {
    background: #1e1e2e;
    color: #f0f0f0;
  }
  .g-tutorial-btn {
    background: #2a2a3a;
    color: #f0f0f0;
    border-color: #444;
  }
  .g-tutorial-step p {
    color: #b0b0c0;
  }
  .g-btn {
    background: transparent;
    color: #f0f0f0;
    border-color: #444;
  }
}

/* ─── 减少动画偏好 ─── */
@media (prefers-reduced-motion: reduce) {
  .g-tutorial-modal { animation: none; }
  .g-achievement-toast { animation: none; }
  .g-confetti-piece { display: none; }
}

/* ─── Stats Page 样式 ─── */
.g-stats-page {
  max-width: 800px;
  margin: 0 auto;
  padding: 1rem;
}
.g-stats-card {
  background: white;
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-sm, 0 1px 3px rgba(0,0,0,0.08));
  border: 1px solid var(--border-light, #f0f0f0);
}
.g-stats-card h3 {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.g-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.75rem;
}
.g-stats-item {
  padding: 0.75rem;
  background: var(--bg-alt, #f8f9fa);
  border-radius: 8px;
  text-align: center;
}
.g-stats-item .label {
  font-size: 0.75rem;
  color: var(--text-light, #888);
  margin-bottom: 0.25rem;
}
.g-stats-item .value {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary, #4f46e5);
}
.g-stats-progress-bar {
  height: 8px;
  background: var(--bg-alt, #f0f0f0);
  border-radius: 4px;
  overflow: hidden;
  margin-top: 0.5rem;
}
.g-stats-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary, #4f46e5), var(--accent, #06b6d4));
  transition: width 0.5s ease;
}
.g-achievement-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.5rem;
}
.g-achievement-item {
  padding: 0.75rem;
  background: var(--bg-alt, #f8f9fa);
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid transparent;
}
.g-achievement-item.unlocked {
  background: linear-gradient(135deg, #fff7e6, #fef3c7);
  border-color: #ffd700;
}
.g-achievement-item.locked {
  opacity: 0.5;
  filter: grayscale(1);
}
.g-achievement-icon {
  font-size: 1.5rem;
}
.g-achievement-info {
  flex: 1;
  min-width: 0;
}
.g-achievement-info .name {
  font-weight: 600;
  font-size: 0.9rem;
}
.g-achievement-info .desc {
  font-size: 0.75rem;
  color: var(--text-light, #888);
}

@media (prefers-color-scheme: dark) {
  .g-stats-card { background: #1e1e2e; border-color: #333; }
  .g-stats-item, .g-achievement-item { background: #2a2a3a; }
  .g-achievement-item.unlocked { background: linear-gradient(135deg, #3a3a1e, #4a4a2e); }
  .g-stats-progress-bar { background: #2a2a3a; }
}


/* ─── A11y: 键盘焦点可见 ─── */
*:focus-visible {
  outline: 3px solid var(--primary, #4f46e5);
  outline-offset: 2px;
  border-radius: 4px;
}
button:focus-visible,
.btn:focus-visible,
.g-btn:focus-visible {
  outline: 3px solid var(--primary, #4f46e5);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.2);
}
/* 游戏元素：被键盘选中时高亮 */
.g-keyboard-selected {
  outline: 3px solid gold !important;
  outline-offset: 2px;
  background: rgba(255, 215, 0, 0.15) !important;
  transform: scale(1.05);
  transition: transform 0.15s;
}
/* 屏幕阅读器专用类（仅视觉隐藏） */
.g-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ─── 减少动画（继承自 style.css，并扩展） ─── */
@media (prefers-reduced-motion: reduce) {
  .g-confetti-piece { display: none !important; }
  .g-tutorial-modal { animation: none !important; }
  .g-achievement-toast { animation: none !important; }
}