*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#e74c3c;
  --primary-dark:#c0392b;
  --text:#2c3e50;
  --text-light:#5d6d7e;
  --bg:#f8f9fa;
  --white:#fff;
  --border:#e8ecef;
  --shadow:0 2px 12px rgba(0,0,0,.08);
  --radius:8px;
}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg);line-height:1.7;font-size:16px}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary-dark)}
img{max-width:100%;height:auto}
.container{max-width:1100px;margin:0 auto;padding:0 20px}

header{background:var(--white);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;box-shadow:var(--shadow)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 0}
.logo{font-size:1.35rem;font-weight:700;color:var(--primary)}
.logo span{color:var(--text)}
nav ul{display:flex;list-style:none;gap:28px}
nav a{color:var(--text);font-size:.95rem;font-weight:500}
nav a:hover,nav a.active{color:var(--primary)}
.nav-toggle{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--text)}

.hero{background:linear-gradient(135deg,#fff 0%,#fef5f4 100%);padding:60px 0 50px;border-bottom:1px solid var(--border)}
.hero-tag{font-size:.85rem;color:var(--text-light);margin-bottom:12px}
.hero h1{font-size:2rem;line-height:1.35;margin-bottom:16px;color:var(--text)}
.hero p{font-size:1.05rem;color:var(--text-light);max-width:640px;margin-bottom:28px}
.hero-badges{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:32px}
.badge{background:var(--white);border:1px solid var(--border);border-radius:20px;padding:6px 16px;font-size:.85rem;color:var(--text-light)}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px}
.btn{display:inline-block;padding:12px 28px;border-radius:var(--radius);font-size:.95rem;font-weight:600;cursor:pointer;border:none;transition:all .2s}
.btn-primary{background:var(--primary);color:var(--white)}
.btn-primary:hover{background:var(--primary-dark);color:var(--white)}
.btn-outline{background:var(--white);color:var(--primary);border:2px solid var(--primary)}
.btn-outline:hover{background:var(--primary);color:var(--white)}

.quick-nav{background:var(--white);padding:36px 0;border-bottom:1px solid var(--border)}
.quick-nav h2{font-size:1.1rem;margin-bottom:20px;color:var(--text)}
.quick-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px}
.quick-item{display:flex;align-items:center;gap:10px;padding:14px 18px;background:var(--bg);border-radius:var(--radius);color:var(--text);font-weight:500;border:1px solid var(--border);transition:all .2s}
.quick-item:hover{background:var(--primary);color:var(--white);border-color:var(--primary)}
.quick-item .icon{font-size:1.3rem}

section{padding:50px 0}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:1.6rem;margin-bottom:10px}
.section-title p{color:var(--text-light);font-size:.95rem}

.features-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.feature-card{background:var(--white);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);border:1px solid var(--border);transition:transform .2s}
.feature-card:hover{transform:translateY(-3px)}
.feature-card .icon{font-size:2rem;margin-bottom:14px}
.feature-card h3{font-size:1.1rem;margin-bottom:10px}
.feature-card p{color:var(--text-light);font-size:.92rem}
.feature-card .tag{display:inline-block;margin-top:12px;font-size:.82rem;color:var(--primary);font-weight:600}

.steps-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px}
.step-card{background:var(--white);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);border:1px solid var(--border);position:relative}
.step-num{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;background:var(--primary);color:var(--white);border-radius:50%;font-weight:700;font-size:.9rem;margin-bottom:14px}
.step-card h3{font-size:1rem;margin-bottom:8px}
.step-card p{color:var(--text-light);font-size:.9rem}

.download-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:22px}
.download-card{background:var(--white);border-radius:var(--radius);padding:30px;text-align:center;box-shadow:var(--shadow);border:1px solid var(--border)}
.download-card .icon{font-size:2.5rem;margin-bottom:14px}
.download-card h3{font-size:1.1rem;margin-bottom:8px}
.download-card p{color:var(--text-light);font-size:.88rem;margin-bottom:18px}
.download-card .btn{width:100%}

.faq-list{max-width:760px;margin:0 auto}
.faq-item{background:var(--white);border-radius:var(--radius);margin-bottom:12px;border:1px solid var(--border);overflow:hidden}
.faq-q{padding:18px 22px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center}
.faq-q::after{content:"▾";color:var(--text-light);transition:transform .2s}
.faq-item.open .faq-q::after{transform:rotate(180deg)}
.faq-a{padding:0 22px;max-height:0;overflow:hidden;transition:all .3s;color:var(--text-light);font-size:.92rem}
.faq-item.open .faq-a{padding:0 22px 18px;max-height:200px}

.cta{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:var(--white);text-align:center;padding:50px 20px;border-radius:var(--radius);margin:20px 0}
.cta h2{font-size:1.5rem;margin-bottom:12px}
.cta p{opacity:.9;margin-bottom:24px;font-size:.95rem}
.cta .btn{background:var(--white);color:var(--primary)}
.cta .btn:hover{background:#fef5f4}

.articles-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px}
.article-card{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--border);transition:transform .2s}
.article-card:hover{transform:translateY(-3px)}
.article-card-body{padding:24px}
.article-card h3{font-size:1.05rem;margin-bottom:10px;line-height:1.4}
.article-card h3 a{color:var(--text)}
.article-card h3 a:hover{color:var(--primary)}
.article-card p{color:var(--text-light);font-size:.9rem;margin-bottom:14px}
.article-meta{font-size:.8rem;color:var(--text-light);display:flex;gap:16px}

.article-content{background:var(--white);border-radius:var(--radius);padding:36px 40px;box-shadow:var(--shadow);border:1px solid var(--border);max-width:800px;margin:0 auto}
.article-content h1{font-size:1.7rem;margin-bottom:12px;line-height:1.35}
.article-content .meta{color:var(--text-light);font-size:.85rem;margin-bottom:28px;padding-bottom:20px;border-bottom:1px solid var(--border)}
.article-content h2{font-size:1.25rem;margin:28px 0 12px;color:var(--text)}
.article-content h3{font-size:1.05rem;margin:20px 0 10px}
.article-content p{margin-bottom:16px;color:var(--text-light);line-height:1.8}
.article-content ul,.article-content ol{margin:0 0 16px 24px;color:var(--text-light)}
.article-content li{margin-bottom:8px}
.article-content blockquote{border-left:4px solid var(--primary);padding:12px 20px;background:var(--bg);margin:20px 0;color:var(--text-light);border-radius:0 var(--radius) var(--radius) 0}

.breadcrumb{font-size:.85rem;color:var(--text-light);margin-bottom:24px}
.breadcrumb a{color:var(--text-light)}
.breadcrumb a:hover{color:var(--primary)}

footer{background:var(--text);color:#bdc3c7;padding:36px 0 24px;margin-top:40px}
.footer-inner{display:flex;flex-wrap:wrap;justify-content:space-between;gap:24px}
.footer-col h4{color:var(--white);font-size:.95rem;margin-bottom:14px}
.footer-col ul{list-style:none}
.footer-col li{margin-bottom:8px}
.footer-col a{color:#bdc3c7;font-size:.88rem}
.footer-col a:hover{color:var(--white)}
.footer-bottom{text-align:center;margin-top:28px;padding-top:20px;border-top:1px solid #3d566e;font-size:.82rem;color:#7f8c8d}

.update-badge{display:inline-block;background:#eafaf1;color:#27ae60;font-size:.75rem;padding:3px 10px;border-radius:12px;margin-left:8px}

@media(max-width:768px){
  .nav-toggle{display:block}
  nav ul{display:none;position:absolute;top:100%;left:0;right:0;background:var(--white);flex-direction:column;padding:16px 20px;gap:0;border-bottom:1px solid var(--border);box-shadow:var(--shadow)}
  nav ul.open{display:flex}
  nav ul li{padding:10px 0;border-bottom:1px solid var(--border)}
  nav ul li:last-child{border-bottom:none}
  .hero h1{font-size:1.5rem}
  .hero{padding:40px 0 36px}
  section{padding:36px 0}
  .article-content{padding:24px 20px}
}