:root{--primary:#ff6b35;--primary-dark:#e85a28;--primary-light:#ff8c5f;--secondary:#f7931e;--accent:#ffd166;--danger:#ff4757;--text:#2d2d2d;--text-light:#666;--text-lighter:#999;--bg:#fafafa;--bg-card:#ffffff;--bg-header:rgba(255,255,255,.96);--bg-search:#f1f1f1;--border:#eeeeee;--shadow-sm:0 2px 12px rgba(0,0,0,.06);--shadow-md:0 4px 18px rgba(0,0,0,.06);--shadow-lg:0 6px 24px rgba(0,0,0,.08);--shadow-hover:0 10px 30px rgba(255,107,53,.15);--radius-sm:10px;--radius-md:14px;--radius-lg:16px;--radius-pill:30px;--transition:0.25s ease}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;line-height:1.8;color:var(--text);background:var(--bg);overflow-x:hidden;transition:background .3s ease,color .3s ease}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block;height:auto}
button{font-family:inherit;cursor:pointer}
input{font-family:inherit}
::selection{background:var(--primary);color:#fff}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:linear-gradient(180deg,var(--primary),var(--secondary));border-radius:5px}
::-webkit-scrollbar-thumb:hover{background:var(--primary-dark)}
.site-header{position:sticky;top:0;z-index:1000;background:var(--bg-header);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:var(--shadow-sm);transition:background .3s ease,box-shadow .3s ease}
.nav-wrap{max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:14px 20px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;color:var(--primary);transition:transform .25s ease}
.brand:hover{transform:scale(1.04)}
.brand svg{width:38px;height:38px;flex-shrink:0;transition:transform .4s ease}
.brand:hover svg{transform:rotate(-8deg) scale(1.08)}
.nav-links{display:flex;gap:26px;font-size:15px}
.nav-links a{color:#444;transition:color .2s ease,transform .2s ease;position:relative;padding:4px 0}
.nav-links a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;background:linear-gradient(90deg,var(--primary),var(--secondary));border-radius:2px;transition:width .3s ease}
.nav-links a:hover{color:var(--primary)}
.nav-links a:hover::after{width:100%}
.nav-actions{display:flex;align-items:center;gap:12px}
.search-box{display:flex;align-items:center;background:var(--bg-search);border-radius:20px;padding:6px 14px;transition:box-shadow .25s ease,background .3s ease}
.search-box:focus-within{box-shadow:0 0 0 2px rgba(255,107,53,.25)}
.search-box input{border:none;background:transparent;outline:none;font-size:14px;width:130px;color:var(--text);transition:width .3s ease}
.search-box input:focus{width:170px}
.search-box input::placeholder{color:var(--text-lighter)}
.search-box button{border:none;background:transparent;cursor:pointer;color:var(--primary);font-size:14px;font-weight:600;transition:color .2s ease,transform .2s ease}
.search-box button:hover{color:var(--primary-dark);transform:scale(1.06)}
.theme-toggle{background:none;border:1px solid var(--border);border-radius:50%;width:36px;height:36px;cursor:pointer;font-size:16px;display:flex;align-items:center;justify-content:center;transition:transform .3s ease,border-color .25s ease,background .25s ease}
.theme-toggle:hover{transform:rotate(20deg) scale(1.1);border-color:var(--primary);background:rgba(255,107,53,.08)}
.mobile-menu-btn{display:none;background:none;border:none;font-size:24px;cursor:pointer;color:var(--primary);transition:transform .25s ease}
.mobile-menu-btn:hover{transform:scale(1.12)}
.hero{position:relative;background:linear-gradient(135deg,#ff6b35 0%,#f7931e 50%,#ff4757 100%);color:#fff;padding:70px 20px 60px;overflow:hidden}
.hero::before{content:"";position:absolute;top:-50%;right:-10%;width:520px;height:520px;background:radial-gradient(circle,rgba(255,255,255,.18),transparent 70%);border-radius:50%;pointer-events:none}
.hero::after{content:"";position:absolute;bottom:-40%;left:-8%;width:420px;height:420px;background:radial-gradient(circle,rgba(255,224,102,.22),transparent 70%);border-radius:50%;pointer-events:none}
.hero-inner{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center;position:relative;z-index:1}
.hero h1{font-size:38px;line-height:1.3;margin-bottom:18px;text-shadow:0 2px 12px rgba(0,0,0,.12);animation:heroFadeUp .8s ease both}
.hero h1 span{color:#ffe066;position:relative;display:inline-block}
.hero h1 span::after{content:"";position:absolute;left:0;bottom:-4px;width:100%;height:3px;background:rgba(255,224,102,.55);border-radius:2px}
.hero p{font-size:16px;opacity:.95;margin-bottom:22px;animation:heroFadeUp .8s ease .15s both}
.hero-cta{display:inline-block;background:#fff;color:var(--primary);padding:12px 30px;border-radius:var(--radius-pill);font-weight:700;transition:transform .25s ease,box-shadow .25s ease,background .25s ease;box-shadow:0 6px 20px rgba(0,0,0,.15);animation:heroFadeUp .8s ease .3s both}
.hero-cta:hover{transform:translateY(-3px) scale(1.03);box-shadow:0 12px 28px rgba(0,0,0,.22);background:#fffdf8}
.hero-cta:active{transform:translateY(-1px) scale(1)}
.hero-art svg{width:100%;max-width:420px;margin:0 auto;display:block;animation:heroFloat 5s ease-in-out infinite;filter:drop-shadow(0 12px 30px rgba(0,0,0,.18))}
@keyframes heroFadeUp{from{opacity:0;transform:translateY(28px)}to{opacity:1;transform:translateY(0)}}
@keyframes heroFloat{0%,100%{transform:translateY(0)}50%{transform:translateY(-14px)}}
.carousel{max-width:1200px;margin:40px auto;padding:0 20px}
.carousel-track{position:relative;background:var(--bg-card);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);overflow:hidden;min-height:200px;backdrop-filter:blur(6px);transition:background .3s ease,box-shadow .3s ease}
.carousel-track::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--primary),var(--secondary),var(--accent));z-index:2}
.slide{display:none;padding:34px 30px}
.slide.active{display:block;animation:fadeIn .5s ease}
@keyframes fadeIn{from{opacity:0;transform:translateX(20px)}to{opacity:1;transform:translateX(0)}}
.slide h3{color:var(--primary);font-size:22px;margin-bottom:10px}
.slide p{color:#555;font-size:15px}
.carousel-dots{display:flex;justify-content:center;gap:10px;margin-top:16px}
.carousel-dots button{width:10px;height:10px;border-radius:50%;border:none;background:#ddd;cursor:pointer;transition:all .3s ease;padding:0}
.carousel-dots button:hover{background:var(--primary-light);transform:scale(1.2)}
.carousel-dots button.active{background:var(--primary);width:24px;border-radius:5px}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section{padding:56px 0}
.section-title{font-size:28px;color:#1a1a1a;margin-bottom:10px;position:relative;display:inline-block;transition:color .3s ease}
.section-title::after{content:"";position:absolute;left:0;bottom:-8px;width:56px;height:4px;background:linear-gradient(90deg,var(--primary),var(--secondary));border-radius:2px;transition:width .4s ease}
.section-title:hover::after{width:100%}
.section-sub{color:var(--text-light);margin:18px 0 36px;font-size:15px}
.breadcrumb{font-size:13px;color:var(--text-lighter);padding:16px 0}
.breadcrumb a{color:var(--primary);transition:color .2s ease}
.breadcrumb a:hover{color:var(--primary-dark);text-decoration:underline}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.card{background:var(--bg-card);border-radius:var(--radius-md);padding:26px;box-shadow:var(--shadow-md);transition:transform .25s ease,box-shadow .25s ease,background .3s ease;position:relative;overflow:hidden}
.card::before{content:"";position:absolute;top:0;left:0;width:100%;height:3px;background:linear-gradient(90deg,var(--primary),var(--secondary));transform:scaleX(0);transform-origin:left;transition:transform .35s ease}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.card:hover::before{transform:scaleX(1)}
.card h3{color:#1a1a1a;font-size:18px;margin-bottom:12px;transition:color .3s ease}
.card p{color:var(--text-light);font-size:14.5px}
.card-icon{width:52px;height:52px;margin-bottom:16px;transition:transform .35s ease}
.card:hover .card-icon{transform:scale(1.12) rotate(-6deg)}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center;background:var(--bg-card);border-radius:var(--radius-lg);padding:36px 20px;box-shadow:var(--shadow-md);transition:background .3s ease,box-shadow .3s ease}
.stats:hover{box-shadow:var(--shadow-hover)}
.stat-num{font-size:34px;font-weight:800;color:var(--primary);line-height:1.2;transition:transform .3s ease}
.stats>div:hover .stat-num{transform:scale(1.1)}
.stat-label{color:var(--text-light);font-size:14px;margin-top:6px}
.article-list{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.article-item{background:var(--bg-card);border-radius:12px;padding:22px;box-shadow:0 3px 14px rgba(0,0,0,.05);border-left:4px solid var(--primary);transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease,background .3s ease}
.article-item:hover{transform:translateX(6px);box-shadow:0 8px 26px rgba(255,107,53,.16);border-left-color:var(--secondary)}
.article-item h4{font-size:16px;color:#1a1a1a;margin-bottom:8px;transition:color .3s ease}
.article-item:hover h4{color:var(--primary)}
.article-meta{font-size:12.5px;color:var(--text-lighter);margin-bottom:10px}
.article-item p{color:var(--text-light);font-size:14px;margin-bottom:10px}
.read-more{color:var(--primary);font-size:13.5px;font-weight:600;transition:color .2s ease,letter-spacing .2s ease}
.read-more:hover{color:var(--primary-dark);letter-spacing:.5px}
.faq-item{background:var(--bg-card);border-radius:var(--radius-sm);margin-bottom:12px;box-shadow:0 2px 10px rgba(0,0,0,.05);overflow:hidden;transition:box-shadow .25s ease,background .3s ease}
.faq-item:hover{box-shadow:0 6px 20px rgba(255,107,53,.12)}
.faq-q{width:100%;text-align:left;background:none;border:none;padding:18px 22px;font-size:15.5px;font-weight:600;color:#1a1a1a;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:14px;transition:color .25s ease,background .25s ease}
.faq-q:hover{color:var(--primary);background:rgba(255,107,53,.04)}
.faq-q::after{content:"+";color:var(--primary);font-size:20px;transition:transform .3s ease;flex-shrink:0;line-height:1}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease,padding .3s ease;padding:0 22px}
.faq-item.open .faq-a{max-height:600px;padding-bottom:18px}
.faq-a p{color:var(--text-light);font-size:14.5px}
.howto-step{display:flex;gap:18px;margin-bottom:22px;transition:transform .25s ease}
.howto-step:hover{transform:translateX(6px)}
.step-num{flex-shrink:0;width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;box-shadow:0 4px 12px rgba(255,107,53,.3);transition:transform .3s ease,box-shadow .3s ease}
.howto-step:hover .step-num{transform:scale(1.12) rotate(-6deg);box-shadow:0 8px 20px rgba(255,107,53,.42)}
.step-body h4{color:#1a1a1a;font-size:16px;margin-bottom:6px;transition:color .3s ease}
.step-body p{color:var(--text-light);font-size:14.5px}
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.contact-item{background:var(--bg-card);border-radius:12px;padding:24px;text-align:center;box-shadow:0 3px 14px rgba(0,0,0,.05);transition:transform .25s ease,box-shadow .25s ease,background .3s ease}
.contact-item:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.contact-item svg{width:40px;height:40px;margin:0 auto 12px;transition:transform .35s ease}
.contact-item:hover svg{transform:scale(1.15) rotate(6deg)}
.contact-item h4{font-size:15px;color:#1a1a1a;margin-bottom:8px;transition:color .3s ease}
.contact-item p{color:var(--text-light);font-size:14px}
.sitemap-links{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.sitemap-links h4{font-size:15px;color:#1a1a1a;margin-bottom:12px;transition:color .3s ease}
.sitemap-links a{display:block;color:var(--text-light);font-size:13.5px;padding:4px 0;transition:color .2s ease,transform .2s ease}
.sitemap-links a:hover{color:var(--primary);transform:translateX(5px)}
.site-footer{background:#1a1a1a;color:#aaa;padding:50px 20px 24px;margin-top:40px;position:relative;overflow:hidden}
.site-footer::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--primary),var(--secondary),var(--accent),var(--primary));background-size:200% 100%;animation:footerGlow 4s linear infinite}
@keyframes footerGlow{0%{background-position:0% 0}100%{background-position:200% 0}}
.footer-inner{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;position:relative;z-index:1}
.footer-brand{color:var(--primary);font-size:20px;font-weight:800;margin-bottom:14px}
.footer-col h4{color:#fff;font-size:15px;margin-bottom:14px}
.footer-col a{display:block;color:#aaa;font-size:13.5px;padding:4px 0;transition:color .2s ease,transform .2s ease}
.footer-col a:hover{color:var(--primary);transform:translateX(4px)}
.footer-bottom{max-width:1200px;margin:30px auto 0;padding-top:20px;border-top:1px solid #333;font-size:12.5px;color:#777;text-align:center;position:relative;z-index:1}
.footer-bottom a{transition:color .2s ease,opacity .2s ease}
.footer-bottom a:hover{opacity:.8;text-decoration:underline}
.back-top{position:fixed;right:24px;bottom:24px;width:46px;height:46px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;border:none;font-size:20px;cursor:pointer;box-shadow:0 4px 16px rgba(255,107,53,.4);display:none;z-index:999;transition:transform .25s ease,box-shadow .25s ease}
.back-top:hover{transform:translateY(-4px) scale(1.08);box-shadow:0 10px 26px rgba(255,107,53,.55)}
.back-top.show{display:flex;align-items:center;justify-content:center;animation:backTopIn .35s ease}
@keyframes backTopIn{from{opacity:0;transform:translateY(16px) scale(.8)}to{opacity:1;transform:translateY(0) scale(1)}}
.reveal{opacity:0;transform:translateY(30px);transition:opacity .6s ease,transform .6s ease}
.reveal.visible{opacity:1;transform:translateY(0)}
body.dark{background:#121212;color:#ddd}
body.dark .site-header{background:rgba(20,20,20,.96)}
body.dark .nav-links a{color:#bbb}
body.dark .nav-links a:hover{color:var(--primary)}
body.dark .card,body.dark .article-item,body.dark .faq-item,body.dark .contact-item,body.dark .stats,body.dark .carousel-track,body.dark .slide{background:#1e1e1e;color:#ccc}
body.dark .card h3,body.dark .article-item h4,body.dark .faq-q,body.dark .contact-item h4,body.dark .section-title,body.dark .step-body h4,body.dark .sitemap-links h4{color:#eee}
body.dark .card p,body.dark .article-item p,body.dark .faq-a p,body.dark .contact-item p,body.dark .step-body p{color:#aaa}
body.dark .site-footer{background:#0a0a0a}
body.dark .search-box{background:#2a2a2a}
body.dark .search-box input{color:#ddd}
body.dark .search-box input::placeholder{color:#777}
body.dark .theme-toggle{border-color:#444;color:#ddd}
body.dark .theme-toggle:hover{border-color:var(--primary);background:rgba(255,107,53,.12)}
body.dark .slide p{color:#bbb}
body.dark .sitemap-links a{color:#aaa}
body.dark .sitemap-links a:hover{color:var(--primary)}
body.dark .breadcrumb{color:#777}
body.dark .breadcrumb a{color:var(--primary)}
body.dark .section-sub{color:#999}
body.dark .stat-label{color:#999}
body.dark .article-meta{color:#777}
body.dark .faq-q:hover{background:rgba(255,107,53,.08)}
body.dark .carousel-dots button{background:#444}
body.dark .carousel-dots button.active{background:var(--primary)}
body.dark .carousel-dots button:hover{background:var(--primary-light)}
body.dark .mobile-menu-btn{color:var(--primary)}
body.dark .nav-links{background:rgba(20,20,20,.98)}
@media(max-width:900px){
.hero-inner{grid-template-columns:1fr;text-align:center}
.hero h1{font-size:28px}
.hero p{font-size:15px}
.hero-art svg{max-width:320px}
.grid-3,.grid-2,.article-list,.contact-grid,.sitemap-links{grid-template-columns:1fr}
.stats{grid-template-columns:repeat(2,1fr)}
.footer-inner{grid-template-columns:1fr 1fr}
.nav-links{display:none;position:absolute;top:100%;left:0;right:0;background:var(--bg-card);flex-direction:column;padding:20px;box-shadow:0 8px 20px rgba(0,0,0,.1);gap:16px;animation:navDrop .3s ease}
.nav-links.open{display:flex}
@keyframes navDrop{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}
.mobile-menu-btn{display:block}
.search-box{display:none}
.section{padding:44px 0}
.section-title{font-size:24px}
.card{padding:22px}
.slide{padding:26px 22px}
.slide h3{font-size:19px}
.faq-q{font-size:14.5px;padding:16px 18px}
.faq-a{padding:0 18px}
.faq-item.open .faq-a{padding-bottom:16px}
.howto-step{gap:14px}
.step-num{width:36px;height:36px;font-size:14px}
.back-top{right:16px;bottom:16px;width:42px;height:42px}
}
@media(max-width:520px){
.stats{grid-template-columns:1fr;padding:28px 16px}
.stat-num{font-size:28px}
.footer-inner{grid-template-columns:1fr;gap:24px}
.hero{padding:50px 16px 44px}
.hero h1{font-size:23px}
.hero p{font-size:14px}
.hero-cta{padding:10px 24px;font-size:14px}
.carousel{margin:28px auto;padding:0 16px}
.container{padding:0 16px}
.section{padding:36px 0}
.section-title{font-size:21px}
.section-sub{font-size:14px;margin:16px 0 28px}
.card{padding:20px;border-radius:12px}
.card h3{font-size:16px}
.card p{font-size:13.5px}
.article-item{padding:18px}
.article-item h4{font-size:15px}
.faq-q{font-size:14px;padding:14px 16px}
.faq-a{padding:0 16px}
.faq-item.open .faq-a{padding-bottom:14px}
.slide{padding:22px 18px}
.slide h3{font-size:17px}
.slide p{font-size:13.5px}
.contact-item{padding:20px}
.howto-step{gap:12px;margin-bottom:18px}
.step-num{width:32px;height:32px;font-size:13px}
.step-body h4{font-size:15px}
.step-body p{font-size:13.5px}
}
@media(prefers-reduced-motion:reduce){
*,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
.hero-art svg{animation:none}
.reveal{opacity:1;transform:none}
}
@media print{
.site-header,.back-top,.hero-cta,.carousel,.theme-toggle,.mobile-menu-btn,.search-box{display:none !important}
body{background:#fff;color:#000}
.card,.article-item,.faq-item,.contact-item,.stats{box-shadow:none;border:1px solid #ddd}
}