:root {
  --color-primary: #C41E3A;
  --color-primary-dark: #9B1B2E;
  --color-text: #333333;
  --color-text-light: #545454;
  --color-bg: #ffffff;
  --color-bg-gray: #f5f5f5;
  --color-border: #e5e7e7;
  --font-stack: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-stack);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

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

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  box-sizing: border-box;
}

/* 确保 sticky 元素在缩放时对齐视口两侧 */
header[class*="sticky"] {
  width: 100%;
}

/* 防止 grid 子元素在缩放时被内容撑破 */
.grid > * {
  min-width: 0;
}

/* 全屏背景图在缩放时确保正确覆盖 */
.bg-cover {
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.section { padding: 80px 0; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-primary);
  color: #fff;
  padding: 12px 32px;
  border-radius: 9999px;
  font-size: 14px;
  font-weight: 500;
  transition: background 0.2s;
  border: none;
  cursor: pointer;
}

.btn-primary:hover { background: var(--color-primary-dark); }

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(255,255,255,0.4);
  color: #fff;
  padding: 12px 32px;
  border-radius: 9999px;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
}

.btn-outline:hover { background: rgba(255,255,255,0.1); }

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}
.animate-shimmer {
  animation: shimmer 8s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 0.8; }
}