*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:#2c3e50;background:#f5f6fa;line-height:1.8;font-size:16px;overflow-x:hidden;transition:background .4s ease,color .4s ease}
a{color:#c0392b;text-decoration:none;transition:color .3s ease}
a:hover{color:#e74c3c}
img{max-width:100%;height:auto;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.header{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,.82);backdrop-filter:blur(14px) saturate(180%);-webkit-backdrop-filter:blur(14px) saturate(180%);box-shadow:0 2px 20px rgba(0,0,0,.06);border-bottom:1px solid rgba(255,255,255,.4)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px;max-width:1200px;margin:0 auto;padding:0 20px}
.logo{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:700;color:#c0392b;letter-spacing:.5px}
.logo svg{width:36px;height:36px;transition:transform .5s cubic-bezier(.34,1.56,.64,1)}
.logo:hover svg{transform:rotate(-8deg) scale(1.08)}
.nav{display:flex;gap:24px;list-style:none}
.nav a{font-size:15px;color:#34495e;font-weight:500;padding:6px 0;border-bottom:2px solid transparent;position:relative;transition:color .3s,border-color .3s}
.nav a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;background:linear-gradient(90deg,#c0392b,#e67e22);transition:width .35s cubic-bezier(.4,0,.2,1)}
.nav a:hover::after,.nav a.active::after{width:100%}
.nav a:hover,.nav a.active{color:#c0392b;border-bottom-color:transparent}
.header-actions{display:flex;align-items:center;gap:12px}
.search-box{display:flex;align-items:center;background:rgba(240,242,245,.85);border-radius:20px;padding:6px 14px;transition:box-shadow .3s,background .3s;border:1px solid transparent}
.search-box:focus-within{box-shadow:0 0 0 3px rgba(192,57,43,.12);background:#fff;border-color:rgba(192,57,43,.25)}
.search-box input{border:none;background:transparent;outline:none;font-size:14px;width:140px;color:#2c3e50}
.search-box input::placeholder{color:#95a5a6}
.search-box button{border:none;background:transparent;cursor:pointer;color:#7f8c8d;font-size:16px;transition:transform .3s,color .3s}
.search-box button:hover{color:#c0392b;transform:scale(1.15)}
.theme-toggle{background:rgba(240,242,245,.85);border:none;cursor:pointer;font-size:18px;padding:8px;border-radius:50%;width:38px;height:38px;display:flex;align-items:center;justify-content:center;transition:transform .4s cubic-bezier(.34,1.56,.64,1),background .3s}
.theme-toggle:hover{transform:rotate(25deg) scale(1.1);background:rgba(192,57,43,.1)}
.mobile-menu-btn{display:none;background:none;border:none;font-size:24px;cursor:pointer;color:#2c3e50;padding:4px}
.hero{position:relative;background:linear-gradient(135deg,#c0392b 0%,#e74c3c 45%,#e67e22 100%);color:#fff;padding:72px 0 64px;overflow:hidden}
.hero::before{content:"";position:absolute;top:-30%;left:-5%;width:420px;height:420px;background:radial-gradient(circle,rgba(255,255,255,.14),transparent 70%);border-radius:50%;animation:float 8s ease-in-out infinite}
.hero::after{content:"";position:absolute;bottom:-45%;right:-8%;width:520px;height:520px;background:radial-gradient(circle,rgba(255,255,255,.1),transparent 70%);border-radius:50%;animation:float 10s ease-in-out infinite reverse}
@keyframes float{0%,100%{transform:translateY(0) scale(1)}50%{transform:translateY(-24px) scale(1.05)}}
.hero-content{position:relative;z-index:2;max-width:1200px;margin:0 auto;padding:0 20px}
.hero h1{font-size:38px;font-weight:800;margin-bottom:18px;line-height:1.3;letter-spacing:.5px;text-shadow:0 2px 16px rgba(0,0,0,.12);animation:fadeUp .8s ease both}
.hero p{font-size:17px;opacity:.96;max-width:760px;margin-bottom:26px;animation:fadeUp .8s .1s ease both}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;animation:fadeUp .8s .2s ease both}
.hero-tags span{background:rgba(255,255,255,.18);padding:7px 18px;border-radius:20px;font-size:14px;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);border:1px solid rgba(255,255,255,.28);transition:transform .3s,background .3s;cursor:default}
.hero-tags span:hover{transform:translateY(-3px);background:rgba(255,255,255,.3)}
@keyframes fadeUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}
.section{padding:56px 0}
.section-title{font-size:28px;font-weight:700;color:#2c3e50;text-align:center;margin-bottom:12px;position:relative;letter-spacing:.5px}
.section-title::after{content:"";display:block;width:56px;height:4px;border-radius:2px;background:linear-gradient(90deg,#c0392b,#e67e22);margin:14px auto 0}
.section-subtitle{text-align:center;color:#7f8c8d;font-size:15px;margin-bottom:40px}
.breadcrumb{font-size:14px;color:#7f8c8d;padding:16px 0}
.breadcrumb a{color:#7f8c8d}
.breadcrumb a:hover{color:#c0392b}
.breadcrumb span{margin:0 8px}
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.card{background:#fff;border-radius:16px;overflow:hidden;box-shadow:0 2px 14px rgba(0,0,0,.06);transition:transform .4s cubic-bezier(.4,0,.2,1),box-shadow .4s;position:relative}
.card::before{content:"";position:absolute;inset:0;border-radius:16px;padding:1px;background:linear-gradient(135deg,rgba(192,57,43,.5),rgba(230,126,34,.35));-webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:opacity .4s;pointer-events:none;z-index:3}
.card:hover{transform:translateY(-8px);box-shadow:0 16px 36px rgba(192,57,43,.16)}
.card:hover::before{opacity:1}
.card-img{width:100%;height:180px;background:#f0f2f5;display:flex;align-items:center;justify-content:center;overflow:hidden;position:relative}
.card-img svg{width:100%;height:100%;transition:transform .6s cubic-bezier(.4,0,.2,1)}
.card:hover .card-img svg{transform:scale(1.08)}
.card-body{padding:20px}
.card-body h3{font-size:17px;font-weight:700;margin-bottom:8px;color:#2c3e50;transition:color .3s}
.card:hover .card-body h3{color:#c0392b}
.card-body p{font-size:14px;color:#7f8c8d;line-height:1.7}
.card-meta{display:flex;justify-content:space-between;font-size:12px;color:#95a5a6;margin-top:12px;padding-top:12px;border-top:1px solid #f0f2f5}
.card-meta span:first-child{color:#c0392b;font-weight:600;background:rgba(192,57,43,.08);padding:2px 10px;border-radius:10px}
.article-list{display:grid;gap:24px}
.article-item{background:#fff;border-radius:16px;padding:28px;box-shadow:0 2px 14px rgba(0,0,0,.06);transition:transform .4s cubic-bezier(.4,0,.2,1),box-shadow .4s;position:relative;overflow:hidden}
.article-item::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:linear-gradient(180deg,#c0392b,#e67e22);transform:scaleY(0);transform-origin:top;transition:transform .4s cubic-bezier(.4,0,.2,1)}
.article-item:hover{transform:translateX(6px);box-shadow:0 12px 32px rgba(0,0,0,.1)}
.article-item:hover::before{transform:scaleY(1)}
.article-item h3{font-size:19px;font-weight:700;margin-bottom:10px;color:#2c3e50;transition:color .3s}
.article-item:hover h3{color:#c0392b}
.article-item .meta{font-size:13px;color:#95a5a6;margin-bottom:12px}
.article-item p{font-size:15px;color:#5d6d7e;margin-bottom:14px}
.read-more{font-size:14px;font-weight:600;color:#c0392b;display:inline-block;transition:transform .3s,color .3s}
.read-more:hover{text-decoration:none;transform:translateX(4px);color:#e74c3c}
.faq-list{max-width:900px;margin:0 auto}
.faq-item{background:#fff;border-radius:14px;margin-bottom:14px;box-shadow:0 2px 10px rgba(0,0,0,.05);overflow:hidden;transition:box-shadow .35s,transform .35s}
.faq-item:hover{box-shadow:0 8px 24px rgba(192,57,43,.1);transform:translateY(-2px)}
.faq-item.open{box-shadow:0 10px 28px rgba(192,57,43,.14)}
.faq-question{width:100%;text-align:left;background:none;border:none;padding:20px 24px;font-size:16px;font-weight:600;color:#2c3e50;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:12px;transition:background .3s,color .3s;font-family:inherit}
.faq-question:hover{background:rgba(192,57,43,.04)}
.faq-item.open .faq-question{color:#c0392b}
.faq-question .icon{font-size:22px;color:#c0392b;transition:transform .4s cubic-bezier(.34,1.56,.64,1);flex-shrink:0;line-height:1}
.faq-item.open .faq-question .icon{transform:rotate(135deg)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .45s ease,padding .45s ease;padding:0 24px;font-size:15px;color:#5d6d7e;line-height:1.8}
.faq-item.open .faq-answer{max-height:520px;padding:0 24px 22px}
.howto-section{background:#fff;border-radius:18px;padding:36px;box-shadow:0 2px 14px rgba(0,0,0,.06);max-width:900px;margin:0 auto;position:relative;overflow:hidden}
.howto-section::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,#c0392b,#e74c3c,#e67e22)}
.howto-section h3{font-size:20px;font-weight:700;margin:24px 0 12px;color:#2c3e50;padding-left:14px;position:relative}
.howto-section h3::before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:5px;height:18px;border-radius:3px;background:linear-gradient(180deg,#c0392b,#e67e22)}
.howto-section h3:first-child{margin-top:0}
.howto-section p,.howto-section li{font-size:15px;color:#5d6d7e;line-height:1.9}
.howto-section ol,.howto-section ul{padding-left:24px;margin:8px 0}
.howto-section li{margin-bottom:6px}
.howto-section li strong{color:#c0392b}
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:24px;text-align:center}
.stat-item{background:#fff;border-radius:16px;padding:32px 16px;box-shadow:0 2px 14px rgba(0,0,0,.06);transition:transform .4s cubic-bezier(.4,0,.2,1),box-shadow .4s;position:relative;overflow:hidden}
.stat-item::after{content:"";position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:0;height:3px;background:linear-gradient(90deg,#c0392b,#e67e22);transition:width .4s}
.stat-item:hover{transform:translateY(-6px);box-shadow:0 14px 32px rgba(192,57,43,.14)}
.stat-item:hover::after{width:60%}
.stat-number{font-size:36px;font-weight:800;background:linear-gradient(135deg,#c0392b,#e67e22);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:8px;line-height:1.2}
.stat-label{font-size:14px;color:#7f8c8d}
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:24px}
.contact-card{background:#fff;border-radius:16px;padding:28px;text-align:center;box-shadow:0 2px 14px rgba(0,0,0,.06);transition:transform .4s cubic-bezier(.4,0,.2,1),box-shadow .4s;position:relative;overflow:hidden}
.contact-card::before{content:"";position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:radial-gradient(circle,rgba(192,57,43,.06),transparent 60%);opacity:0;transition:opacity .4s}
.contact-card:hover{transform:translateY(-6px);box-shadow:0 14px 32px rgba(192,57,43,.14)}
.contact-card:hover::before{opacity:1}
.contact-card .icon{font-size:32px;margin-bottom:12px;display:inline-block;transition:transform .4s cubic-bezier(.34,1.56,.64,1)}
.contact-card:hover .icon{transform:scale(1.2) rotate(-6deg)}
.contact-card h4{font-size:16px;font-weight:700;margin-bottom:8px;color:#2c3e50}
.contact-card p{font-size:14px;color:#7f8c8d;position:relative;z-index:1}
.footer{background:#1a1a2e;color:#a0a0b0;padding:48px 0 24px;margin-top:40px;position:relative;overflow:hidden}
.footer::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,#c0392b,#e74c3c,#e67e22)}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:32px;margin-bottom:32px}
.footer h4{color:#fff;font-size:16px;font-weight:700;margin-bottom:16px}
.footer ul{list-style:none}
.footer ul li{margin-bottom:8px}
.footer ul a{color:#a0a0b0;font-size:14px;position:relative;transition:color .3s,padding-left .3s}
.footer ul a:hover{color:#e74c3c;padding-left:6px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding-top:24px;text-align:center;font-size:13px;color:#6c6c80}
.footer-bottom p{margin-bottom:6px}
.back-to-top{position:fixed;bottom:30px;right:30px;width:46px;height:46px;border-radius:50%;background:linear-gradient(135deg,#c0392b,#e74c3c);color:#fff;border:none;font-size:20px;cursor:pointer;box-shadow:0 6px 20px rgba(192,57,43,.45);display:none;z-index:999;transition:opacity .35s,transform .35s cubic-bezier(.34,1.56,.64,1)}
.back-to-top.show{display:flex;align-items:center;justify-content:center;animation:popIn .4s cubic-bezier(.34,1.56,.64,1)}
.back-to-top:hover{transform:translateY(-4px) scale(1.08);box-shadow:0 10px 28px rgba(192,57,43,.55)}
@keyframes popIn{from{opacity:0;transform:scale(.5)}to{opacity:1;transform:scale(1)}}
.author-box{background:#fff;border-radius:18px;padding:28px;box-shadow:0 2px 14px rgba(0,0,0,.06);display:flex;gap:20px;align-items:flex-start;max-width:900px;margin:0 auto 32px;position:relative;overflow:hidden}
.author-box::before{content:"";position:absolute;top:0;left:0;bottom:0;width:4px;background:linear-gradient(180deg,#c0392b,#e67e22)}
.author-avatar{width:64px;height:64px;border-radius:50%;background:linear-gradient(135deg,#c0392b,#e67e22);display:flex;align-items:center;justify-content:center;color:#fff;font-size:24px;font-weight:700;flex-shrink:0;box-shadow:0 6px 16px rgba(192,57,43,.3);transition:transform .4s cubic-bezier(.34,1.56,.64,1)}
.author-box:hover .author-avatar{transform:scale(1.08) rotate(-6deg)}
.author-info h4{font-size:16px;font-weight:700;margin-bottom:6px;color:#2c3e50}
.author-info p{font-size:14px;color:#7f8c8d;line-height:1.7}
.trust-badges{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-top:24px}
.trust-badge{background:rgba(255,255,255,.7);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border:1px solid rgba(192,57,43,.15);border-radius:10px;padding:10px 20px;font-size:13px;color:#5d6d7e;display:flex;align-items:center;gap:6px;transition:transform .35s,box-shadow .35s,border-color .35s}
.trust-badge:hover{transform:translateY(-3px);box-shadow:0 8px 20px rgba(192,57,43,.12);border-color:rgba(192,57,43,.35)}
.sitemap-links{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-top:16px}
.sitemap-links a{font-size:13px;color:#7f8c8d;padding:5px 14px;border:1px solid #e8e8e8;border-radius:18px;transition:all .3s}
.sitemap-links a:hover{border-color:#c0392b;color:#c0392b;background:rgba(192,57,43,.06);transform:translateY(-2px)}
section[id]{scroll-margin-top:80px}
@media(max-width:768px){
.nav{display:none;position:absolute;top:64px;left:0;right:0;background:rgba(255,255,255,.96);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);flex-direction:column;padding:16px 20px;gap:0;box-shadow:0 8px 24px rgba(0,0,0,.12);animation:slideDown .35s ease}
@keyframes slideDown{from{opacity:0;transform:translateY(-12px)}to{opacity:1;transform:translateY(0)}}
.nav.open{display:flex}
.nav a{padding:12px 0;border-bottom:1px solid #f0f2f5}
.nav a:last-child{border-bottom:none}
.mobile-menu-btn{display:block}
.search-box{display:none}
.hero{padding:48px 0 40px}
.hero h1{font-size:26px}
.hero p{font-size:15px}
.hero-tags span{font-size:13px;padding:6px 14px}
.section{padding:40px 0}
.section-title{font-size:22px}
.card-grid{grid-template-columns:1fr}
.article-item{padding:20px}
.article-item h3{font-size:17px}
.howto-section{padding:24px}
.author-box{flex-direction:column;align-items:center;text-align:center;padding:24px}
.back-to-top{bottom:20px;right:20px;width:42px;height:42px}
.stat-number{font-size:30px}
}
@media(max-width:480px){
.hero h1{font-size:22px}
.hero p{font-size:14px}
.section-title{font-size:20px}
.container{padding:0 16px}
.header-inner{padding:0 16px}
}
body.dark{background:#12121a;color:#d0d0d8}
body.dark .header{background:rgba(26,26,46,.82);box-shadow:0 2px 20px rgba(0,0,0,.35);border-bottom-color:rgba(255,255,255,.05)}
body.dark .nav a{color:#b0b0c0}
body.dark .nav a:hover,body.dark .nav a.active{color:#e74c3c}
body.dark .card,body.dark .article-item,body.dark .faq-item,body.dark .stat-item,body.dark .contact-card,body.dark .howto-section,body.dark .author-box{background:#1e1e30;box-shadow:0 2px 14px rgba(0,0,0,.25)}
body.dark .card:hover,body.dark .article-item:hover,body.dark .faq-item:hover,body.dark .stat-item:hover,body.dark .contact-card:hover{box-shadow:0 14px 32px rgba(0,0,0,.4)}
body.dark .card-body h3,body.dark .article-item h3,body.dark .faq-question,body.dark .stat-number,body.dark .contact-card h4,body.dark .howto-section h3,body.dark .author-info h4,body.dark .section-title{color:#e8e8f0}
body.dark .card-body p,body.dark .article-item p,body.dark .faq-answer,body.dark .stat-label,body.dark .contact-card p,body.dark .howto-section p,body.dark .howto-section li,body.dark .author-info p,body.dark .section-subtitle{color:#a0a0b0}
body.dark .search-box{background:rgba(42,42,64,.85)}
body.dark .search-box:focus-within{background:#2a2a40}
body.dark .search-box input{color:#e0e0e8}
body.dark .search-box input::placeholder{color:#6c6c80}
body.dark .theme-toggle{background:rgba(42,42,64,.85);color:#e0e0e8}
body.dark .mobile-menu-btn{color:#e0e0e8}
body.dark .breadcrumb,body.dark .breadcrumb a{color:#808090}
body.dark .breadcrumb a:hover{color:#e74c3c}
body.dark .trust-badge{background:rgba(30,30,48,.8);border-color:rgba(255,255,255,.08);color:#a0a0b0}
body.dark .sitemap-links a{border-color:#2a2a40;color:#808090}
body.dark .sitemap-links a:hover{border-color:#e74c3c;color:#e74c3c;background:rgba(231,76,60,.1)}
body.dark .card-meta{border-top-color:#2a2a40}
body.dark .card-meta span:first-child{background:rgba(231,76,60,.15)}
body.dark .faq-question:hover{background:rgba(231,76,60,.08)}
body.dark .faq-item.open .faq-question{color:#e74c3c}
body.dark .faq-question .icon{color:#e74c3c}
body.dark .howto-section li strong{color:#e74c3c}
body.dark .nav.open{background:rgba(26,26,46,.97)}
body.dark .nav a{border-bottom-color:#2a2a40}
body.dark .article-item::before{background:linear-gradient(180deg,#e74c3c,#e67e22)}
body.dark .author-box::before{background:linear-gradient(180deg,#e74c3c,#e67e22)}
body.dark .stat-item::after{background:linear-gradient(90deg,#e74c3c,#e67e22)}
body.dark .howto-section::before{background:linear-gradient(90deg,#e74c3c,#e67e22)}
body.dark .footer{background:#0d0d16}
body.dark .back-to-top{background:linear-gradient(135deg,#e74c3c,#e67e22)}
@media(prefers-reduced-motion:reduce){
*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
}