/* 全局重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Microsoft YaHei", sans-serif;
}

/* 导航栏样式 */
.navbar {
  background-color: #2c3e50;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.navbar .logo {
  color: white;
  font-size: 1.5rem;
  font-weight: bold;
}

.navbar .nav-links {
  display: flex;
  gap: 2rem;
}

.navbar .nav-links a {
  color: white;
  text-decoration: none;
  font-size: 1rem;
  transition: color 0.3s;
}

.navbar .nav-links a:hover {
  color: #3498db;
}

/* 页面容器 */
.container {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 2rem;
}

/* 首页样式 */
.hero {
  text-align: center;
  padding: 4rem 0;
}

.hero h1 {
  font-size: 2.5rem;
  color: #2c3e50;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.2rem;
  color: #7f8c8d;
  margin-bottom: 2rem;
}

.card-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 3rem;
}

.card {
  background-color: white;
  border-radius: 8px;
  box-shadow: 0 3px 10px rgba(0,0,0,0.1);
  padding: 2rem;
  text-align: center;
  transition: transform 0.3s;
}

.card:hover {
  transform: translateY(-5px);
}

.card h2 {
  color: #3498db;
  margin-bottom: 1rem;
}

.card p {
  color: #7f8c8d;
  margin-bottom: 1.5rem;
}

.card a {
  display: inline-block;
  background-color: #3498db;
  color: white;
  padding: 0.8rem 1.5rem;
  border-radius: 4px;
  text-decoration: none;
  transition: background-color 0.3s;
}

.card a:hover {
  background-color: #2980b9;
}

/* 单词查询页样式 */
.search-box {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
}

.search-box input {
  flex: 1;
  padding: 1rem;
  font-size: 1rem;
  border: 1px solid #ddd;
  border-radius: 4px;
  outline: none;
}

.search-box button {
  padding: 0 2rem;
  background-color: #3498db;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1rem;
}

.result-card {
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 2rem;
  margin-top: 2rem;
  display: none;
}

.result-card h3 {
  font-size: 1.8rem;
  color: #2c3e50;
  margin-bottom: 1rem;
}

.result-card .phonetic {
  color: #3498db;
  margin-bottom: 1rem;
  font-style: italic;
}

.result-card .meaning {
  margin-bottom: 1rem;
  line-height: 1.6;
}

.result-card .example {
  color: #7f8c8d;
  font-style: italic;
}

/* 单词背诵页样式 */
.recite-card {
  text-align: center;
  padding: 3rem;
  border: 1px solid #ddd;
  border-radius: 8px;
  margin-bottom: 2rem;
}

.recite-card .word {
  font-size: 2rem;
  color: #2c3e50;
  margin-bottom: 1rem;
}

.recite-card .hint {
  color: #7f8c8d;
  margin-bottom: 2rem;
  cursor: pointer;
}

.recite-card .controls {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.recite-card button {
  padding: 0.8rem 1.5rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1rem;
}

.btn-next {
  background-color: #2ecc71;
  color: white;
}

.btn-mark {
  background-color: #e67e22;
  color: white;
}

/* 单词测试页样式 */
.question {
  margin-bottom: 2rem;
  padding: 1.5rem;
  border: 1px solid #ddd;
  border-radius: 8px;
}

.question h4 {
  font-size: 1.2rem;
  color: #2c3e50;
  margin-bottom: 1rem;
}

.options {
  display: grid;
  gap: 0.8rem;
  margin-bottom: 1rem;
}

.option {
  padding: 0.8rem;
  border: 1px solid #ddd;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.3s;
}

.option:hover {
  background-color: #f5f5f5;
}

.option.selected {
  background-color: #3498db;
  color: white;
  border-color: #3498db;
}

.test-controls {
  display: flex;
  justify-content: space-between;
  margin-top: 2rem;
}

.test-controls button {
  padding: 0.8rem 1.5rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1rem;
}

.btn-submit {
  background-color: #2ecc71;
  color: white;
}

.btn-reset {
  background-color: #e74c3c;
  color: white;
}

.score {
  text-align: center;
  font-size: 1.5rem;
  color: #2c3e50;
  margin-top: 2rem;
  display: none;
}

/* 响应式适配 */
@media (max-width: 768px) {
  .card-container {
    grid-template-columns: 1fr;
  }
  
  .navbar .nav-links {
    gap: 1rem;
  }
  
  .search-box {
    flex-direction: column;
  }
}