@charset "UTF-8";

/* ===== 重置样式 ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.8;
  color: #333333;
  background-color: #F5F5F5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.4;
  color: #1A1A2E;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

a {
  color: #16C79A;
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: #0FA07A;
}

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

ul, ol {
  list-style: none;
}

button, input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  outline: none;
  border: none;
  background: none;
}

table {
  border-collapse: collapse;
  width: 100%;
}

/* ===== CSS变量 ===== */
:root {
  --primary: #1A1A2E;
  --secondary: #16C79A;
  --dark-bg: #0F0F1A;
  --light-bg: #F5F5F5;
  --text-white: #FFFFFF;
  --text-dark: #333333;
  --text-muted: #666666;
  --border-color: #D0D0D5;
  --container-max: 1200px;
  --section-padding: 60px 0;
}

/* ===== 工具类 ===== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

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

.d-flex { display: flex; }
.d-block { display: block; }
.d-inline-block { display: inline-block; }
.d-none { display: none; }

.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.align-center { align-items: center; }
.flex-wrap { flex-wrap: wrap; }

.mt-10 { margin-top: 10px; }
.mt-20 { margin-top: 20px; }
.mt-30 { margin-top: 30px; }
.mt-40 { margin-top: 40px; }
.mb-10 { margin-bottom: 10px; }
.mb-20 { margin-bottom: 20px; }
.mb-30 { margin-bottom: 30px; }
.mb-40 { margin-bottom: 40px; }

.pt-10 { padding-top: 10px; }
.pt-20 { padding-top: 20px; }
.pt-30 { padding-top: 30px; }
.pt-40 { padding-top: 40px; }
.pb-10 { padding-bottom: 10px; }
.pb-20 { padding-bottom: 20px; }
.pb-30 { padding-bottom: 30px; }
.pb-40 { padding-bottom: 40px; }

/* 辅助色 */
.bg-primary { background-color: var(--primary); }
.bg-dark { background-color: var(--dark-bg); }
.bg-light { background-color: var(--light-bg); }
.text-white { color: var(--text-white); }
.text-primary { color: var(--primary); }
.text-secondary { color: var(--secondary); }
.text-muted { color: var(--text-muted); }

/* 清除浮动 */
.clearfix::after {
  content: "";
  display: table;
  clear: both;
}

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

/* ===== 响应式字体 ===== */
@media (max-width: 768px) {
  html { font-size: 14px; }
  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.35rem; }
  h3 { font-size: 1.2rem; }
}