:root{--primary: #9C27B0;--primary-hover: #7B1FA2;--accent: #E040FB;--bg-main: #FFFFFF;--bg-secondary: #F5F5F5;--text-main: #333333;--text-secondary: #999999;--font-family: "Inter", system-ui, Avenir, Helvetica, Arial, sans-serif;--wechat-green: #07C160;--wechat-green-hover: #06AD56}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);background-color:var(--bg-main);color:var(--text-main);line-height:1.6;-webkit-font-smoothing:antialiased}a{text-decoration:none;color:inherit}button{font-family:inherit}h1,h2,h3,h4,h5,h6{color:var(--text-main);font-weight:700}.container{max-width:1200px;margin:0 auto;padding:0 20px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 24px;border-radius:6px;font-weight:600;transition:all .2s ease;cursor:pointer;border:none;gap:8px}.btn-primary{background-color:var(--primary);color:#fff}.btn-wechat{background-color:var(--wechat-green);color:#fff}.btn-wechat:hover{background-color:var(--wechat-green-hover);transform:translateY(-1px)}.btn-primary:hover{background-color:var(--primary-hover);transform:translateY(-1px)}.card{background-color:var(--bg-main);border-radius:12px;padding:24px;box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -1px #0000000f}.section{padding:80px 0}.section.bg-gray{background-color:var(--bg-secondary)}.download-grid{display:grid;grid-template-columns:1fr;gap:24px;max-width:1200px;margin:0 auto}@media(min-width:640px){.download-grid{grid-template-columns:repeat(2,1fr)}}@media(min-width:1024px){.download-grid{grid-template-columns:repeat(4,1fr)}}