/* base.css - reset + 通用样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  font-family: 'Helvetica Neue', Arial, 'Microsoft YaHei', sans-serif;
  font-size: 14px;
  line-height: 1.6;
  color: #333;
  background: #fff;
  scroll-behavior: smooth;
}

body {
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color .2s ease;
}

img {
  max-width: 100%;
  display: block;
}

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
}

ul {
  list-style: none;
}

/* 通用容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 内页主内容 - 顶部菜单 100px 固定，主内容需要 padding-top */
main {
  min-height: calc(100vh - 100px);
}

/* 通用section */
.section {
  padding: 80px 0;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  color: #d90734;
  text-align: center;
  margin-bottom: 20px;
}

.section-subtitle {
  text-align: center;
  color: #666;
  margin-bottom: 60px;
  font-size: 16px;
}

/* 按钮 */
.btn-primary {
  display: inline-block;
  background: #d90734;
  color: #fff;
  padding: 12px 40px;
  font-weight: 600;
  letter-spacing: 1px;
  border: none;
  cursor: pointer;
  transition: background .2s ease;
}
.btn-primary:hover {
  background: #b30528;
}

/* 滚动条美化 */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: #f1f1f1; }
::-webkit-scrollbar-thumb { background: #d90734; }
::-webkit-scrollbar-thumb:hover { background: #b30528; }