/* ============================================
   L-MATH 乐学数学 - 练习中心页样式
   ============================================ */

* { margin: 0; padding: 0; box-sizing: border-box; }
body { background: linear-gradient(180deg, #FFF5EB 0%, #FFF 100%); min-height: 100vh; }
.practice-header {
  background: linear-gradient(135deg, #69DB7C 0%, #8CE99A 100%);
  color: white; padding: 64px 24px 48px; text-align: center;
}
.practice-header h1 { font-family: 'ZCOOL KuaiLe', cursive; font-size: 2.2rem; margin-bottom: 12px; }
.practice-header p { opacity: 0.9; font-size: 1.05rem; }
.practice-body { max-width: 900px; margin: 0 auto; padding: 40px 24px; }
.grade-section { margin-bottom: 40px; }
.grade-title { font-family: 'ZCOOL KuaiLe', cursive; font-size: 1.4rem; margin-bottom: 16px; padding-bottom: 8px; border-bottom: 2px solid #eee; display: flex; align-items: center; gap: 10px; }
.grade-title .emoji { font-size: 1.4rem; }
.unit-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.unit-practice-card {
  background: white; border-radius: 14px; padding: 16px 20px;
  display: flex; align-items: center; gap: 12px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.06); border: 1px solid #f0f0f0;
  transition: all 0.3s; cursor: pointer; text-decoration: none; color: inherit;
}
.unit-practice-card:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,0.1); }
.unit-practice-card.available { border-left: 4px solid #69DB7C; }
.unit-num { width: 36px; height: 36px; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-weight: 700; color: white; font-size: 0.95rem; flex-shrink: 0; }
.unit-info { flex: 1; }
.unit-info h4 { font-size: 0.95rem; color: #2D3436; margin-bottom: 3px; }
.unit-info p { font-size: 0.8rem; color: #aaa; }
.unit-status { 
  display: inline-block; font-size: 0.75rem; padding: 4px 10px; border-radius: 999px; margin-left: auto;
  font-weight: 600;
}
.unit-status.available { background: #D4EDDA; color: #28A745; }
.unit-status.coming-soon { background: #f1f3f4; color: #999; }
.unit-progress {
  display: flex; flex-direction: column; align-items: flex-end; gap: 4px;
}
.progress-mini {
  width: 60px; height: 6px; background: #eee; border-radius: 3px; overflow: hidden;
}
.progress-mini-fill {
  height: 100%; background: linear-gradient(90deg, #69DB7C, #4CB87A); border-radius: 3px;
  transition: width 0.3s ease;
}
.progress-text-mini {
  font-size: 0.7rem; color: #888;
}
.back-link { display: inline-flex; align-items: center; gap: 6px; color: #2D8A4E; font-weight: 600; font-size: 0.95rem; margin-bottom: 24px; }
.back-link:hover { text-decoration: underline; }
.notice-box { background: linear-gradient(135deg, #E8F4FF 0%, #D6EEFF 100%); border-radius: 16px; padding: 20px 24px; border: 2px solid #4DABF7; margin-bottom: 32px; }
.notice-box h3 { color: #2b7ed9; margin-bottom: 8px; font-family: 'ZCOOL KuaiLe', cursive; }
.notice-box p { color: #555; font-size: 0.9rem; line-height: 1.7; }
.stats-box { 
  display: flex; gap: 20px; justify-content: center; flex-wrap: wrap;
  margin-bottom: 32px;
}
.stat-item {
  background: white; padding: 16px 24px; border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.06); text-align: center;
}
.stat-item .num { font-size: 1.8rem; font-weight: 800; color: #FF6B35; }
.stat-item .label { font-size: 0.85rem; color: #888; }