/* CSS初始化模板 - 通用版本 */
/* 重置默认样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* 设置基础字体和颜色 */
html {
  font-size: 16px;
  line-height: 1.6;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto",
    "Helvetica Neue", Arial, sans-serif;
  color: #333;
  background-color: #fff;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
}

/* 链接样式重置 */
a {
  text-decoration: none;
  color: #007bff;
  transition: color 0.3s ease;
}

a:hover {
  color: #0056b3;
}

/* 列表样式重置 */
ul,
ol {
  list-style: none;
}

/* 图片样式 */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* 表单元素重置 */
input,
textarea,
select,
button {
  font-family: inherit;
  font-size: inherit;
  border: 1px solid #ddd;
  outline: none;
  background: #fff;
  padding: 8px 12px;
  border-radius: 4px;
}

input:focus,
textarea:focus,
select:focus {
  border-color: #007bff;
  box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

button {
  cursor: pointer;
  background-color: #007bff;
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 4px;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #0056b3;
}

button:disabled {
  background-color: #6c757d;
  cursor: not-allowed;
}

/* 表格样式重置 */
table {
  border-collapse: collapse;
  border-spacing: 0;
  width: 100%;
}

th,
td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid #ddd;
}

th {
  background-color: #f8f9fa;
  font-weight: 600;
}

/* 标题样式重置 */
h1,
h2,
h3,
h4,
h5,
h6 {
  margin-bottom: 0.5em;
  font-weight: 600;
  line-height: 1.2;
}

h1 {
  font-size: 2.5rem;
}
h2 {
  font-size: 2rem;
}
h3 {
  font-size: 1.75rem;
}
h4 {
  font-size: 1.5rem;
}
h5 {
  font-size: 1.25rem;
}
h6 {
  font-size: 1rem;
}

/* 段落和文本样式 */
p {
  margin-bottom: 1em;
}

strong {
  font-weight: 600;
}

em {
  font-style: italic;
}

/* 容器和布局 */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.row {
  display: flex;
  flex-wrap: wrap;
  margin: 0 -10px;
}

.col {
  flex: 1;
  padding: 0 10px;
}

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

/* 隐藏元素但保持可访问性 */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* 工具类 */
.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 {
  display: inline;
}
.d-inline-block {
  display: inline-block;
}
.d-none {
  display: none;
}

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

.mt-1 {
  margin-top: 0.25rem;
}
.mt-2 {
  margin-top: 0.5rem;
}
.mt-3 {
  margin-top: 1rem;
}
.mt-4 {
  margin-top: 1.5rem;
}
.mt-5 {
  margin-top: 3rem;
}

.mb-1 {
  margin-bottom: 0.25rem;
}
.mb-2 {
  margin-bottom: 0.5rem;
}
.mb-3 {
  margin-bottom: 1rem;
}
.mb-4 {
  margin-bottom: 1.5rem;
}
.mb-5 {
  margin-bottom: 3rem;
}

.p-1 {
  padding: 0.25rem;
}
.p-2 {
  padding: 0.5rem;
}
.p-3 {
  padding: 1rem;
}
.p-4 {
  padding: 1.5rem;
}
.p-5 {
  padding: 3rem;
}

/* 动画基础 */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideIn {
  from {
    transform: translateY(-20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.fade-in {
  animation: fadeIn 0.5s ease-in;
}

.slide-in {
  animation: slideIn 0.6s ease-out;
}

/* 媒体查询 - 响应式断点 */
@media (max-width: 1200px) {
  .container {
    max-width: 1140px;
  }
}

@media (max-width: 992px) {
  .container {
    max-width: 960px;
  }

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

@media (max-width: 768px) {
  .container {
    max-width: 720px;
    padding: 0 15px;
  }

  html {
    font-size: 14px;
  }

  .row {
    flex-direction: column;
    margin: 0;
  }

  .col {
    padding: 0;
    margin-bottom: 10px;
  }
}

@media (max-width: 576px) {
  .container {
    max-width: 540px;
    padding: 0 10px;
  }

  html {
    font-size: 12px;
  }

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