/* 全局样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding: 20px;
  color: #333;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
}

/* 头部样式 */
header {
  text-align: center;
  color: white;
  margin-bottom: 40px;
  padding: 40px 20px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: 20px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

header h1 {
  font-size: 3rem;
  margin-bottom: 10px;
  font-weight: 700;
}

header p {
  font-size: 1.2rem;
  opacity: 0.9;
}

/* 搜索和筛选区域 */
.search-filter {
  background: white;
  padding: 25px;
  border-radius: 15px;
  margin-bottom: 30px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.search-box {
  margin-bottom: 20px;
}

.search-box input {
  width: 100%;
  padding: 15px 20px;
  font-size: 1.1rem;
  border: 2px solid #e0e0e0;
  border-radius: 10px;
  transition: all 0.3s ease;
}

.search-box input:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.filter-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.filter-btn {
  padding: 10px 20px;
  border: 2px solid #667eea;
  background: white;
  color: #667eea;
  border-radius: 25px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.3s ease;
}

.filter-btn:hover {
  background: #667eea;
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.filter-btn.active {
  background: #667eea;
  color: white;
}

/* 动词网格 */
.verbs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.verb-card {
  background: white;
  border-radius: 15px;
  padding: 25px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.verb-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.verb-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #667eea, #764ba2);
}

.verb-card.irregular::before {
  background: linear-gradient(90deg, #f093fb, #f5576c);
}

.verb-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.verb-french {
  font-size: 1.8rem;
  font-weight: 700;
  color: #667eea;
}

.verb-chinese {
  font-size: 1.2rem;
  color: #666;
  margin-bottom: 15px;
}

.verb-example {
  font-size: 0.95rem;
  color: #555;
  line-height: 1.6;
  margin-bottom: 10px;
  font-style: italic;
}

.verb-example-zh {
  font-size: 0.9rem;
  color: #888;
  line-height: 1.5;
}

.verb-type {
  display: inline-block;
  padding: 4px 12px;
  background: #f0f0f0;
  border-radius: 12px;
  font-size: 0.8rem;
  color: #666;
  margin-top: 15px;
}

.verb-card.irregular .verb-type {
  background: #fff0f0;
  color: #f5576c;
}

.verb-number {
  position: absolute;
  top: 15px;
  right: 15px;
  font-size: 0.8rem;
  color: #999;
  font-weight: 500;
}

/* 统计信息 */
.stats {
  background: white;
  padding: 20px;
  border-radius: 15px;
  margin-bottom: 30px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 20px;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: #667eea;
}

.stat-label {
  font-size: 0.9rem;
  color: #666;
  margin-top: 5px;
}

/* 页脚 */
footer {
  text-align: center;
  color: white;
  padding: 30px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: 15px;
  margin-top: 40px;
}

footer p {
  opacity: 0.8;
  font-size: 0.95rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
  header h1 {
    font-size: 2rem;
  }

  header p {
    font-size: 1rem;
  }

  .verbs-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 15px;
  }

  .verb-french {
    font-size: 1.5rem;
  }

  .verb-chinese {
    font-size: 1rem;
  }

  .stats {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  body {
    padding: 10px;
  }

  header {
    padding: 30px 15px;
  }

  .search-filter {
    padding: 20px;
  }

  .verbs-grid {
    grid-template-columns: 1fr;
  }

  .filter-buttons {
    flex-direction: column;
  }

  .filter-btn {
    width: 100%;
  }
}

/* 打印样式 */
@media print {
  body {
    background: white;
    padding: 0;
  }

  header {
    background: white;
    color: black;
    box-shadow: none;
    border-bottom: 2px solid #333;
  }

  .search-filter {
    display: none !important;
  }

  .verb-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }

  footer {
    display: none !important;
  }

  .stats {
    display: none;
  }
}

/* 发音按钮样式 */
.speak-btn {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border: none;
  border-radius: 50%;
  width: 35px;
  height: 35px;
  font-size: 16px;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  padding: 0;
}

.speak-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.speak-btn:active {
  transform: scale(0.95);
}