:root{
  --bg:#ffffff;
  --card:#ffffff;
  --bg-light: #f8f9fa;
  --accent-start:#ff7b25; /* 橘色渐变起 */
  --accent-end:#ff5500;   /* 橘色渐变止 */
  --accent-hover:#ff6a00; /* 悬停色 */
  --text-primary:#2d3748;
  --text-secondary:#718096;
  --text-muted:#a0aec0;
  --border-color: rgba(226, 232, 240, 0.8);
  --glass: rgba(255,255,255,0.8);
  --shadow-sm: 0 2px 10px rgba(0,0,0,0.05);
  --shadow-md: 0 8px 30px rgba(0,0,0,0.1);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.15);
}
*{box-sizing:border-box}
body{margin:0;font-family:Inter,system-ui,Segoe UI,Helvetica,Arial;color:var(--text-primary);background:var(--bg);-webkit-font-smoothing:antialiased;line-height:1.6}
.container{max-width:1100px;margin:0 auto;padding:24px}

/* 头部样式优化 */
.site-header{position:sticky;top:0;backdrop-filter: blur(12px);background:rgba(255,255,255,0.95);border-bottom:1px solid var(--border-color);z-index:100;transition:all 0.3s ease;box-shadow:var(--shadow-sm)}
.nav{display:flex;align-items:center;gap:16px;min-height:70px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text-primary);transition:opacity 0.2s ease}
.brand:hover{opacity:0.8}
.brand-name{font-weight:700;font-size:1.2rem}
.nav-links{margin-left:auto;display:flex;gap:16px}
.nav-links a{color:var(--text-secondary);text-decoration:none;padding:12px 16px;border-radius:8px;transition:all 0.3s ease;font-weight:500}
.nav-links a:hover{color:var(--accent-start);background:var(--bg-light);transform:translateY(-1px)}
.nav-links a:active{transform:translateY(0)}

/* 按钮样式优化 */
.btn{border:0;padding:12px 24px;border-radius:12px;cursor:pointer;font-weight:600;transition:all 0.3s ease;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px}
.btn-primary{background:linear-gradient(135deg,var(--accent-start),var(--accent-end));color:#021827;box-shadow:var(--shadow-sm)}
.btn-primary:hover{background:linear-gradient(135deg,var(--accent-hover),var(--accent-start));transform:translateY(-2px);box-shadow:var(--shadow-md)}
.btn-ghost{background:transparent;border:1px solid var(--border-color);color:var(--muted)}
.btn-ghost:hover{background:var(--glass);color:#fff;border-color:rgba(255,255,255,0.1)}
.btn-cta{font-size:1.1rem;padding:16px 32px;border-radius:16px}

/* 英雄区样式优化 */
.hero{padding:80px 0;position:relative;overflow:hidden;background:linear-gradient(135deg,var(--bg-light),var(--bg))}
.hero-inner{display:flex;gap:48px;align-items:center;position:relative;z-index:1}
.hero-left{flex:1;color:var(--text-primary)}
.hero-right{flex:1;text-align:right;position:relative}
.hero-image{max-width:500px;width:100%;border-radius:16px;box-shadow:var(--shadow-lg);transition:transform 0.3s ease;border:1px solid var(--border-color)}
.hero-image:hover{transform:translateY(-5px) scale(1.02)}
.hero h1{font-size:3rem;font-weight:800;margin:0 0 16px;line-height:1.2;background:linear-gradient(135deg,var(--accent-start),var(--accent-end));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.lead{color:var(--text-secondary);font-size:1.1rem;margin-bottom:24px;line-height:1.6}
.hero-ctas{margin-top:32px;display:flex;gap:16px;flex-wrap:wrap}
.feature-icons{display:flex;gap:20px;list-style:none;padding:0;margin-top:32px;color:var(--text-secondary);flex-wrap:wrap}
.feature-icons li{display:flex;align-items:center;gap:10px;font-weight:500}
.feature-icons .icon{width:20px;height:20px;fill:var(--accent-start)}

/* 下载区域样式优化 */
.download-section{padding:80px 0;background:var(--bg-light);position:relative}
.download-section::before{content:'';position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,var(--border-color),transparent)}
.download-grid{display:grid;grid-template-columns:300px 1fr;gap:32px;align-items:start}
.qr-code{width:200px;height:200px;border-radius:12px;border:1px solid var(--border-color);box-shadow:var(--shadow-sm);transition:transform 0.3s ease}
.qr-code:hover{transform:scale(1.05)}
.download-actions{margin-top:16px;display:flex;flex-direction:column;gap:12px}
.download-link{color:var(--text-secondary);word-break:break-all;font-size:0.9rem}
.note{color:var(--text-muted);font-size:0.9rem;margin-top:16px}
.download-info h3{margin-bottom:16px;color:var(--text-primary)}

/* 卡片和内容区域优化 */
.cards{display:grid;grid-template-columns:repeat(auto-fit, minmax(280px, 1fr));gap:24px;margin-top:32px}
.card{background:var(--card);padding:24px;border-radius:16px;color:var(--text-primary);border:1px solid var(--border-color);transition:all 0.3s ease;position:relative;box-shadow:var(--shadow-sm)}
.card::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,var(--accent-start),var(--accent-end));opacity:0;transition:opacity 0.3s ease}
.card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md)}
.card:hover::before{opacity:1}
.card h4{color:var(--accent-start);margin-top:0;margin-bottom:12px;font-size:1.2rem}

/* 教程和FAQ区域优化 */
.install,.usage,.faq{padding:64px 0}
.container h2{color:var(--accent-start);margin-top:0;margin-bottom:24px;font-size:2.2rem;font-weight:700}
.container h3{color:var(--text-primary);margin-top:24px;margin-bottom:12px;font-size:1.4rem}
ol, ul{margin:0;padding-left:20px;color:var(--text-secondary)}
li{margin-bottom:8px;line-height:1.6}
dl{margin:0}
dt{color:var(--text-primary);font-weight:600;margin-top:16px}
dd{color:var(--text-secondary);margin-left:0;margin-bottom:16px}
.tip{background:linear-gradient(135deg,rgba(255,123,37,0.1),rgba(255,85,0,0.1));padding:16px;border-radius:8px;border-left:4px solid var(--accent-start)}
/* 浮动下载按钮优化 */
.floating-download{position:fixed;right:32px;bottom:32px;padding:16px 24px;border-radius:50px;background:linear-gradient(135deg,var(--accent-start),var(--accent-end));color:white;box-shadow:var(--shadow-lg);display:none;z-index:1000;font-weight:600;transition:all 0.3s ease;animation:pulse 2s infinite}
.floating-download:hover{transform:translateY(-3px) scale(1.05);box-shadow:var(--shadow-md);background:linear-gradient(135deg,var(--accent-hover),var(--accent-start))}
@keyframes pulse{0%,100%{box-shadow:var(--shadow-lg)}50%{box-shadow:0 0 20px rgba(255,123,37,0.4)}}

/* 模态框优化 */
.modal{display:none}
.modal[aria-hidden="false"]{display:block;position:fixed;inset:0;z-index:2000}
.modal-backdrop{position:fixed;inset:0;background:rgba(0,0,0,0.7);backdrop-filter:blur(4px)}
.modal-content{position:relative;max-width:440px;margin:100px auto;background:var(--card);padding:32px;border-radius:20px;color:var(--text-primary);box-shadow:var(--shadow-lg);border:1px solid var(--border-color);text-align:center}
.modal-close{position:absolute;right:16px;top:16px;border:0;background:transparent;color:var(--text-secondary);font-size:24px;cursor:pointer;padding:4px;border-radius:50%;transition:background 0.2s ease}
.modal-close:hover{background:var(--bg-light)}
.qr-large{width:220px;height:220px;border-radius:12px;margin:16px auto;border:1px solid var(--border-color)}
.modal-note{color:var(--text-secondary);margin-top:16px;font-size:0.9rem}

/* 网站底部样式 */
.site-footer{padding:60px 0 30px;background:var(--bg-light);border-top:1px solid var(--border-color)}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit, minmax(200px, 1fr));gap:40px;margin-bottom:40px}
.footer-section h4{color:var(--accent-start);margin-top:0;margin-bottom:20px;font-size:1.1rem}
.footer-section p{color:var(--text-secondary);line-height:1.6;margin-bottom:20px}
.footer-section ul{list-style:none;padding:0;margin:0}
.footer-section li{margin-bottom:12px}
.footer-section a{color:var(--text-secondary);text-decoration:none;transition:color 0.2s ease}
.footer-section a:hover{color:var(--accent-start)}
.footer-social{display:flex;gap:15px;margin-top:20px}
.social-icon{display:inline-block;padding:8px 12px;background:var(--accent-start);color:white;border-radius:4px;font-size:0.9rem;transition:all 0.2s ease}
.social-icon:hover{background:var(--accent-hover);transform:translateY(-2px)}
.footer-bottom{padding-top:30px;border-top:1px solid var(--border-color);text-align:center}
.footer-bottom p{color:var(--text-muted);margin:8px 0;font-size:0.9rem}
.footer-note{font-size:0.8rem;color:var(--text-muted)}

/* 移动端汉堡菜单 */
.hamburger{display:none;flex-direction:column;justify-content:space-around;width:30px;height:24px;background:transparent;border:none;cursor:pointer;padding:0}
.hamburger span{width:100%;height:3px;background:var(--text-primary);border-radius:3px;transition:all 0.3s ease}
.hamburger.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.hamburger.active span:nth-child(2){opacity:0}
.hamburger.active span:nth-child(3){transform:rotate(-45deg) translate(7px,-6px)}

/* 移动端导航菜单 */
.mobile-nav{position:fixed;top:70px;left:0;right:0;background:var(--bg);z-index:90;padding:20px;border-top:1px solid var(--border-color);transform:translateY(-100%);opacity:0;transition:all 0.3s ease;box-shadow:var(--shadow-md)}
.mobile-nav.active{transform:translateY(0);opacity:1}
.mobile-nav-links{display:flex;flex-direction:column;gap:15px}
.mobile-nav-links a{color:var(--text-primary);text-decoration:none;padding:12px;border-radius:8px;transition:all 0.3s ease;font-weight:500}
.mobile-nav-links a:hover{background:var(--bg-light);color:var(--accent-start)}

/* 返回顶部按钮 */
.back-to-top{position:fixed;right:32px;bottom:90px;padding:12px;background:var(--accent-start);color:white;border-radius:50%;box-shadow:var(--shadow-lg);display:none;z-index:1000;transition:all 0.3s ease;border:none;cursor:pointer}
.back-to-top:hover{background:var(--accent-hover);transform:translateY(-3px)}
.back-to-top svg{width:20px;height:20px;fill:white}

/* 响应式调整 */
@media (max-width:900px){
  .hamburger{display:flex}
  .nav-links{display:none}
  .nav-download{display:none}
  
  .hero-inner{flex-direction:column;text-align:center;gap:32px}
  .hero-right{text-align:center}
  .hero h1{font-size:2.2rem}
  .hero-ctas{justify-content:center;flex-direction:column}
  .feature-icons{justify-content:center}
  
  .download-grid{grid-template-columns:1fr;text-align:center;gap:24px}
  .download-info{order:2}
  .download-qr{order:1;display:flex;flex-direction:column;align-items:center}
  
  .floating-download{display:block;right:20px;bottom:20px;padding:12px 20px}
  .cards{grid-template-columns:1fr}
}

@media (max-width:768px){
  .footer-grid{grid-template-columns:1fr;gap:30px}
  .footer-section{margin-bottom:30px}
  .container{padding:16px}
  .hero{padding:48px 0}
  .download-section{padding:48px 0}
  .install,.usage,.faq{padding:48px 0}
  
  .download-grid{gap:24px}
  .qr-code{width:160px;height:160px}
  
  /* 移动端底部调整 */
  .footer-social{justify-content:center}
  .footer-bottom p{font-size:0.8rem}
}

@media (max-width:480px){
  .hero-ctas{flex-direction:column}
  .btn-cta{width:100%}
  .hero h1{font-size:1.8rem}
  .lead{font-size:1rem}
  
  .feature-icons{flex-direction:column;align-items:center}
  .feature-icons li{justify-content:center}
  
  .back-to-top{right:20px;bottom:70px;padding:10px}
}

/* 滚动条样式 */
::-webkit-scrollbar{width:8px}
::-webkit-scrollbar-track{background:var(--bg-light)}
::-webkit-scrollbar-thumb{background:var(--accent-start);border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:var(--accent-hover)}