/* base.css - 重置+变量+工具类（全局加载） */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  color: #333333;
  background-color: #F5F7FA;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.3s ease;
}

ul, ol {
  list-style: none;
}

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

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* 变量 */
:root {
  --primary: #1E3A5F;
  --secondary: #D4A574;
  --dark: #0F1E2E;
  --light-bg: #F5F7FA;
  --text: #333333;
  --text-light: #666666;
  --border: #C8D4E0;
  --white: #FFFFFF;
}

/* 工具类 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

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

.text-primary {
  color: var(--primary);
}

.text-secondary {
  color: var(--secondary);
}

.bg-primary {
  background-color: var(--primary);
}

.bg-dark {
  background-color: var(--dark);
}

.bg-light {
  background-color: var(--light-bg);
}

.flex {
  display: flex;
}

.flex-wrap {
  flex-wrap: wrap;
}

.items-center {
  align-items: center;
}

.justify-between {
  justify-content: space-between;
}

.justify-center {
  justify-content: center;
}

.grid {
  display: grid;
}

.hidden {
  display: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* 通用按钮 */
.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: 4px;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: center;
}

.btn-primary {
  background-color: var(--secondary);
  color: var(--white);
}

.btn-primary:hover {
  background-color: #c9965e;
}

.btn-outline {
  border: 2px solid var(--secondary);
  color: var(--secondary);
  background: transparent;
}

.btn-outline:hover {
  background-color: var(--secondary);
  color: var(--white);
}

/* 段落 */
.lead {
  font-size: 18px;
  color: var(--text-light);
  line-height: 1.8;
}

/* 响应式字体 */
@media (max-width: 768px) {
  html {
    font-size: 14px;
  }
  
  .container {
    padding: 0 15px;
  }
  
  .lead {
    font-size: 16px;
  }
}