/* 通用样式 */
body {
  font-family: Arial, sans-serif;
  background: linear-gradient(to bottom,
    #ffffff 33%,
    #A7D8FF 66%,
    #00B0FF 100%,
    #00B0FF 33%,
    #A7D8FF 66%,
    #ffffff 100%);
  color: #333;
  margin: 0;
  padding: 0;
}

/* 通用容器（你 HTML 里用了 container，这里补上定义） */
.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header 样式 */
header {
  background-color: #ffffff;
  color: #333;
  padding: 16px 0;
}

/* Header 布局：标题 + 导航 + 右侧按钮 */
.header-bar {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-bar h1 {
  margin: 0;
  font-size: 22px;
  white-space: nowrap;
}

/* 导航 */
.main-nav {
  flex: 1;
}

.main-nav ul {
  list-style: none;
  display: flex;
  justify-content: center; /* 导航居中 */
  gap: 20px;
  margin: 0;
  padding: 0;
}

.main-nav ul li {
  margin: 0;
}

.main-nav ul li a {
  color: #00B0FF;
  text-decoration: none;
  font-weight: bold;
  font-size: 18px;
}

.main-nav ul li a:hover {
  color: #A7D8FF;
}

/* 右上角按钮区域 */
.auth-buttons {
  display: flex;
  gap: 10px;
  white-space: nowrap;
}

/* 按钮风格 */
.btn {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 10px;
  text-decoration: none;
  border: 1px solid #A7D8FF;
  color: #00B0FF;
  background: #ffffff;
  font-weight: bold;
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
}

.btn:hover {
  background: #A7D8FF;
  color: #ffffff;
  border-color: #A7D8FF;
}

/* Section 样式 */
.section {
  padding: 40px 20px;
  margin: 0 auto;
  max-width: 1000px;
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  margin-bottom: 20px;
}

/* 首页（Home）部分 */
#home {
  text-align: center;
}

#home p,
#about p,
#contact p,
#contact ul li {
  font-size: 18px;
  color: #555;
}

/* 联系方式链接 */
#contact ul {
  list-style: none;
  padding: 0;
}

#contact ul li a {
  color: #00B0FF;
  text-decoration: none;
}

#contact ul li a:hover {
  color: #A7D8FF;
}

/* 页脚（Footer）部分 */
footer {
  background-color: #ffffff;
  color: #333;
  text-align: center;
  padding: 10px 0;
}

/* 表单通用样式 */
.form-card {
  max-width: 560px;
  margin: 0 auto;
}

.form-row {
  margin: 12px 0;
}

.form-row label {
  display: block;
  font-weight: bold;
  margin-bottom: 6px;
}

.input {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid #ddd;
  outline: none;
  box-sizing: border-box;
}

.input:focus {
  border-color: #A7D8FF;
}

.help {
  margin-top: 10px;
  opacity: 0.85;
}

.alert {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid #ffd1d1;
  background: #fff2f2;
  color: #a40000;
  margin: 10px 0;
}

/* 小按钮行 */
.inline-row {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

/* 响应式设计 */
@media screen and (max-width: 768px) {
  .header-bar {
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
  }

  .header-bar h1 {
    width: 100%;
    text-align: center;
  }

  .main-nav {
    width: 100%;
  }

  .main-nav ul {
    flex-direction: column;
    align-items: center;
    gap: 10px;
  }

  .auth-buttons {
    width: 100%;
    justify-content: center;
  }
}