/* 关键CSS - 首屏渲染必需的最小样式 */

/* 基础重置和字体 */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: 'Montserrat', system-ui, -apple-system, sans-serif;
  font-display: swap;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 基础布局 */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;
}

@media (min-width: 768px) {
  .container {
    padding: 0 2rem;
  }
}

/* 基础按钮样式 */
button {
  cursor: pointer;
  border: none;
  background: transparent;
  font-family: inherit;
}

/* 基础链接样式 */
a {
  color: inherit;
  text-decoration: none;
}

/* 基础表单元素 */
input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
}

/* 隐藏元素直到JavaScript加载 */
.js-loading {
  opacity: 0;
  transition: opacity 0.3s ease;
}

.js-loaded .js-loading {
  opacity: 1;
}

/* 防止布局偏移的占位符 */
.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}