*,*::before,*::after{box-sizing:border-box}

body{margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";font-size:16px;line-height:1.6;color:#2c3e50;background:#f8f9fa;overflow-x:hidden}

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

a{color:#1a73e8;text-decoration:none;transition:color 0.3s ease}

a:hover

ul{list-style:none;padding:0;margin:0}

h1,h2,h3,h4{margin:0 0 1rem 0;font-weight:600;line-height:1.3;color:#1a1a1a}

h1{font-size:2.5rem}

h2{font-size:2rem}

h3{font-size:1.5rem}

h4{font-size:1.25rem}

p{margin:0 0 1rem 0}

.container{max-width:1200px;margin:0 auto;padding:0 1rem}

/* 头部与导航 */
header{background:#fff;box-shadow:0 1px 3px rgba(15,23,42,0.06);position:sticky;top:0;z-index:1000}
header .container{display:flex;align-items:center;justify-content:space-between;padding:0.75rem 1rem}
header .logo,header .site-logo,header .brand{font-size:1.5rem;font-weight:700;color:#1a73e8}
.main-nav{display:flex;align-items:center;gap:1.75rem}
.main-nav a{font-size:0.95rem;color:#374151}
.main-nav a:hover
.nav-toggle{display:none;background:transparent;border:none;font-size:1.6rem;line-height:1;cursor:pointer;padding:0;margin-left:1.5rem}

.section{padding:4rem 1rem;background:#fff}

.section-alt{background:#f8f9fa}

.section h2{text-align:center;margin-bottom:1rem;color:#1a1a1a;font-size:2rem}

.section-intro{text-align:center;max-width:800px;margin:0 auto 3rem;color:#5f6368;font-size:1.1rem}

.hero{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:#fff;padding:5rem 1rem;text-align:center;position:relative;overflow:hidden}

.hero-container{max-width:900px;margin:0 auto;position:relative;z-index:2}

.hero h1{color:#fff;margin-bottom:1.5rem;font-size:2.5rem;text-shadow:0 2px 4px rgba(0,0,0,0.1)}

.hero p{font-size:1.1rem;margin-bottom:1.5rem;line-height:1.8;opacity:0.95}

.hero-cta{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;margin-top:2rem}

.hero-image{max-width:100%;height:auto;margin:2rem auto 0;border-radius:12px;box-shadow:0 8px 24px rgba(0,0,0,0.15)}

.breadcrumb{background:#fff;padding:0.75rem 1rem;border-bottom:1px solid #e0e0e0;font-size:0.9rem;color:#5f6368}

.breadcrumb .container{display:flex;align-items:center;gap:0.5rem}

.btn{display:inline-block;padding:0.75rem 1.5rem;background:#1a73e8;color:#fff;border-radius:8px;font-weight:500;transition:all 0.3s ease;border:none;cursor:pointer;text-align:center;font-size:1rem}

.btn:hover{background:#1557b0;transform:translateY(-2px);box-shadow:0 4px 12px rgba(26,115,232,0.3);color:#fff}

.btn-secondary{background:#5f6368;color:#fff}

.btn-secondary:hover

.btn-primary{background:#1a73e8}

.btn-large{padding:1rem 2rem;font-size:1.1rem}

.btn-link{color:#1a73e8;font-weight:500;display:inline-flex;align-items:center;gap:0.5rem;transition:gap 0.3s ease}

.btn-link:hover

.btn-link::after{content:'→';font-size:1.2rem}

.product-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem;margin-top:2rem}

.product-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,0.08);transition:all 0.3s ease;display:flex;flex-direction:column}

.product-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(0,0,0,0.12)}

.product-card img{width:100%;height:250px;object-fit:cover}

.product-card h3{padding:1.5rem 1.5rem 0.5rem;color:#1a1a1a;font-size:1.3rem}

.product-card p{padding:0 1.5rem 0.5rem;color:#5f6368;font-size:0.95rem}

.product-card .btn{margin:1rem 1.5rem 1.5rem;align-self:flex-start}

.comparison-table-wrapper{overflow-x:auto;margin:2rem 0;border-radius:12px;box-shadow:0 2px 8px rgba(0,0,0,0.08)}

.comparison-table{width:100%;border-collapse:collapse;background:#fff;min-width:800px}

.comparison-table thead{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:#fff}

.comparison-table th{padding:1rem;text-align:left;font-weight:600;border-bottom:2px solid #e0e0e0}

.comparison-table td{padding:1rem;border-bottom:1px solid #e0e0e0;color:#2c3e50}

.comparison-table tbody tr:hover

.comparison-table tbody tr:last-child td{border-bottom:none}

.comparison-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem;margin-top:2rem}

.comparison-card{background:#fff;border-radius:12px;padding:2rem;box-shadow:0 2px 8px rgba(0,0,0,0.08)}

.comparison-card img{width:100%;height:200px;object-fit:cover;border-radius:8px;margin-bottom:1.5rem}

.comparison-card h3{color:#1a1a1a;margin-bottom:1rem;font-size:1.3rem}

.comparison-card p{color:#5f6368;margin-bottom:1rem;font-size:0.95rem}

.guide-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:2rem;margin-top:2rem}

.guide-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,0.08);transition:all 0.3s ease}

.guide-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(0,0,0,0.12)}

.guide-card img{width:100%;height:220px;object-fit:cover}

.guide-card h3{padding:1.5rem 1.5rem 0.5rem;color:#1a1a1a;font-size:1.25rem}

.guide-card p{padding:0 1.5rem 0.5rem;color:#5f6368;font-size:0.95rem;line-height:1.7}

.guide-card .btn{margin:1rem 1.5rem 1.5rem}

.news-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem;margin-top:2rem}

.news-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,0.08);transition:all 0.3s ease;display:flex;flex-direction:column}

.news-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(0,0,0,0.12)}

.news-card img{width:100%;height:200px;object-fit:cover}

.news-card time{display:block;padding:1rem 1.5rem 0;color:#1a73e8;font-weight:600;font-size:0.9rem}

.news-card h3{padding:0.5rem 1.5rem;color:#1a1a1a;font-size:1.2rem;line-height:1.4}

.news-card p{padding:0 1.5rem 1rem;color:#5f6368;font-size:0.95rem;line-height:1.7;flex-grow:1}

.news-card .btn-link{padding:0 1.5rem 1.5rem}

.faq-container{max-width:900px;margin:2rem auto}

.faq-item{background:#fff;border-radius:12px;margin-bottom:1rem;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,0.06);transition:all 0.3s ease}

.faq-item:hover{box-shadow:0 4px 12px rgba(0,0,0,0.1)}

.faq-question{padding:1.5rem;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-size:1.1rem;color:#1a1a1a;font-weight:600;transition:background 0.3s ease;user-select:none}

.faq-question:hover

.faq-icon{font-size:1.5rem;color:#1a73e8;transition:transform 0.3s ease;font-weight:400}

.faq-question[aria-expanded="true"] .faq-icon{transform:rotate(45deg)}

.faq-answer{max-height:0;overflow:hidden;transition:max-height 0.4s ease,padding 0.4s ease;padding:0 1.5rem}

.faq-answer.active{max-height:2000px;padding:0 1.5rem 1.5rem}

.faq-answer p{color:#5f6368;margin-bottom:0.75rem;line-height:1.8}

.faq-answer p:last-child

.about-content{display:grid;grid-template-columns:2fr 1fr;gap:3rem;align-items:center;margin-top:2rem}

.about-text p{color:#5f6368;margin-bottom:1.5rem;line-height:1.8}

.about-image{width:100%;border-radius:12px;box-shadow:0 4px 16px rgba(0,0,0,0.1)}

.risk-content{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:2rem;margin-top:2rem}

.risk-card{background:#fff;border-radius:12px;padding:2rem;box-shadow:0 2px 8px rgba(0,0,0,0.08);border-left:4px solid #ea4335}

.risk-card h3{color:#ea4335;margin-bottom:1rem;font-size:1.3rem}

.risk-card p{color:#5f6368;margin-bottom:1rem;line-height:1.8;font-size:0.95rem}

.contact-content{display:grid;grid-template-columns:2fr 1fr;gap:3rem;align-items:center;margin-top:2rem}

.contact-text p{color:#5f6368;margin-bottom:1.5rem;line-height:1.8}

.contact-text ul{list-style:disc;padding-left:1.5rem;margin:1.5rem 0}

.contact-text ul li{color:#5f6368;margin-bottom:0.75rem;line-height:1.7}

.contact-text .btn{margin-top:1.5rem}

.contact-image{width:100%;border-radius:12px;box-shadow:0 4px 16px rgba(0,0,0,0.1)}

.footer{background:#1a1a1a;color:#e0e0e0;padding:3rem 1rem 1rem}

.footer-content{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:2rem;margin-bottom:2rem}

.footer-section h4{color:#fff;margin-bottom:1rem;font-size:1.1rem}

.footer-section p{color:#b0b0b0;font-size:0.9rem;line-height:1.7}

.footer-section ul{list-style:none;padding:0}

.footer-section ul li{margin-bottom:0.5rem}

.footer-section a{color:#b0b0b0;font-size:0.9rem;transition:color 0.3s ease}

.footer-section a:hover

.footer-bottom{border-top:1px solid #3c4043;padding-top:1.5rem;text-align:center}

.footer-bottom p{color:#b0b0b0;font-size:0.85rem;margin-bottom:0.5rem;line-height:1.6}

@media(max-width:1024px){
.hero h1{font-size:2rem}
.section h2{font-size:1.75rem}
.product-grid,.guide-grid,.news-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.comparison-cards{grid-template-columns:1fr}
.about-content,.contact-content{grid-template-columns:1fr}
}

@media(max-width:768px){
.main-nav{display:none;flex-direction:column;position:absolute;top:100%;left:0;right:0;background:#fff;padding:1rem;box-shadow:0 12px 30px rgba(15,23,42,0.18);border-radius:12px}
.main-nav.active{display:flex}
.main-nav a{padding:0.5rem 0}
.nav-toggle{display:inline-flex;align-items:center;justify-content:center}
.hero{padding:3rem 1rem}
.hero h1{font-size:1.8rem}
.hero p{font-size:1rem}
.hero-cta{flex-direction:column}
.hero-cta .btn{width:100%}
.section{padding:3rem 1rem}
.section h2{font-size:1.5rem}
.section-intro{font-size:1rem}
h1{font-size:2rem}
h2{font-size:1.75rem}
h3{font-size:1.25rem}
body{font-size:14px}
.product-grid,.guide-grid,.news-grid,.comparison-cards,.risk-content{grid-template-columns:1fr;gap:1.5rem}
.comparison-table-wrapper{border-radius:8px}
.faq-question{font-size:1rem;padding:1.25rem}
.footer-content{grid-template-columns:1fr}
.breadcrumb{font-size:0.85rem}
.about-image,.contact-image{margin-top:1.5rem}
}

@media(max-width:480px){
.container{padding:0 0.75rem}
header .container{padding:0.75rem}
.hero{padding:2rem 0.75rem}
.hero h1{font-size:1.5rem}
.section{padding:2rem 0.75rem}
.product-card,.guide-card,.news-card,.comparison-card,.risk-card{border-radius:8px}
.btn{padding:0.65rem 1.25rem;font-size:0.95rem}
.btn-large{padding:0.85rem 1.5rem;font-size:1rem}
.faq-question{padding:1rem;font-size:0.95rem}
.faq-answer.active{padding:0 1rem 1rem}
}

@media(min-width:1400px){
.container{max-width:1320px}
.hero h1{font-size:3rem}
.section h2{font-size:2.25rem}
}