:root{
--brand:#c62828;
--brand-dark:#8e1c1c;
--brand-light:#ff6b6b;
--accent:#f5a623;
--bg:#ffffff;
--bg-soft:#faf7f5;
--bg-alt:#fdf3f2;
--text:#222222;
--text-soft:#555555;
--text-mute:#888888;
--border:#ece3e0;
--shadow:0 6px 24px rgba(198,40,40,.08);
--shadow-hover:0 16px 40px rgba(198,40,40,.16);
--glass-bg:rgba(255,255,255,.72);
--glass-border:rgba(255,255,255,.6);
--radius:14px;
--radius-lg:20px;
--maxw:1180px;
--font:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
html[data-theme="dark"]{
--brand:#ff5a5a;
--brand-dark:#c62828;
--brand-light:#ff8f8f;
--accent:#ffb347;
--bg:#141414;
--bg-soft:#1c1c1c;
--bg-alt:#2a1a1a;
--text:#eeeeee;
--text-soft:#c7c7c7;
--text-mute:#9a9a9a;
--border:#2e2e2e;
--shadow:0 6px 24px rgba(0,0,0,.5);
--shadow-hover:0 16px 40px rgba(0,0,0,.65);
--glass-bg:rgba(28,28,28,.72);
--glass-border:rgba(255,255,255,.08);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
font-family:var(--font);
background:var(--bg);
color:var(--text);
line-height:1.8;
font-size:16px;
-webkit-font-smoothing:antialiased;
transition:background .3s,color .3s;
overflow-x:hidden;
}
img,svg{max-width:100%;display:block}
a{color:var(--brand);text-decoration:none;transition:color .2s}
a:hover{text-decoration:underline}
ul{list-style:none}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.skip-link{position:absolute;left:-9999px;top:0;background:var(--brand);color:#fff;padding:10px 16px;z-index:9999;border-radius:0 0 8px 0}
.skip-link:focus{left:0}

/* header */
.site-header{
position:sticky;top:0;z-index:1000;
background:var(--glass-bg);
-webkit-backdrop-filter:saturate(180%) blur(16px);
backdrop-filter:saturate(180%) blur(16px);
border-bottom:1px solid var(--border);
box-shadow:0 2px 12px rgba(0,0,0,.04);
transition:background .3s,border-color .3s;
}
.header-inner{display:flex;align-items:center;gap:20px;min-height:68px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;color:var(--text);white-space:nowrap}
.logo:hover{text-decoration:none;color:var(--brand)}
.logo-mark{width:38px;height:38px;flex:0 0 38px;transition:transform .35s ease}
.logo:hover .logo-mark{transform:rotate(-8deg) scale(1.06)}
.logo-text small{display:block;font-size:11px;color:var(--text-mute);font-weight:500;letter-spacing:1px}
.main-nav{flex:1}
.main-nav ul{display:flex;gap:4px;flex-wrap:wrap}
.main-nav a{display:block;padding:8px 12px;border-radius:8px;color:var(--text-soft);font-size:15px;font-weight:500;transition:background .2s,color .2s}
.main-nav a:hover,.main-nav a[aria-current="page"]{background:var(--bg-alt);color:var(--brand);text-decoration:none}
.header-actions{display:flex;align-items:center;gap:8px}
.search-box{display:flex;align-items:center;background:var(--bg-soft);border:1px solid var(--border);border-radius:999px;padding:4px 6px 4px 12px;transition:border-color .2s,box-shadow .2s}
.search-box:focus-within{border-color:var(--brand-light);box-shadow:0 0 0 3px rgba(198,40,40,.12)}
.search-box input{border:0;background:transparent;outline:none;color:var(--text);font-size:14px;width:130px;font-family:inherit}
.search-box button{border:0;background:var(--brand);color:#fff;border-radius:999px;padding:6px 12px;cursor:pointer;font-size:13px;font-family:inherit;transition:background .2s,transform .2s}
.search-box button:hover{background:var(--brand-dark);transform:scale(1.04)}
.icon-btn{width:38px;height:38px;border-radius:10px;border:1px solid var(--border);background:var(--bg-soft);color:var(--text-soft);cursor:pointer;display:grid;place-items:center;font-size:16px;transition:color .2s,border-color .2s,transform .2s,background .2s}
.icon-btn:hover{color:var(--brand);border-color:var(--brand-light);transform:translateY(-2px)}
.menu-toggle{display:none}

/* hero */
.hero{
position:relative;overflow:hidden;
background:linear-gradient(135deg,#fff5f4 0%,#ffe9e7 45%,#fff7f2 100%);
}
.hero::before{
content:"";position:absolute;top:-30%;right:-10%;width:600px;height:600px;
background:radial-gradient(circle,rgba(255,107,107,.22),transparent 70%);
border-radius:50%;pointer-events:none;
}
.hero::after{
content:"";position:absolute;bottom:-40%;left:-10%;width:500px;height:500px;
background:radial-gradient(circle,rgba(245,166,35,.16),transparent 70%);
border-radius:50%;pointer-events:none;
}
html[data-theme="dark"] .hero{background:linear-gradient(135deg,#241414 0%,#2a1818 45%,#1d1414 100%)}
html[data-theme="dark"] .hero::before{background:radial-gradient(circle,rgba(255,90,90,.18),transparent 70%)}
html[data-theme="dark"] .hero::after{background:radial-gradient(circle,rgba(255,179,71,.12),transparent 70%)}
.hero-inner{position:relative;z-index:1;display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center;padding:56px 0 64px}
.hero h1{font-size:clamp(26px,3.4vw,40px);line-height:1.35;font-weight:800;letter-spacing:.5px;margin-bottom:16px}
.hero h1 .hl{color:var(--brand);position:relative;white-space:nowrap}
.hero h1 .hl::after{content:"";position:absolute;left:0;right:0;bottom:2px;height:8px;background:linear-gradient(90deg,rgba(255,107,107,.35),rgba(245,166,35,.25));border-radius:4px;z-index:-1}
.hero-lead{font-size:17px;color:var(--text-soft);margin-bottom:22px;max-width:560px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:26px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:999px;font-weight:600;font-size:15px;border:1px solid transparent;cursor:pointer;font-family:inherit;transition:transform .25s,box-shadow .25s,background .25s,color .25s}
.btn:hover{text-decoration:none;transform:translateY(-2px)}
.btn-primary{background:linear-gradient(135deg,var(--brand-light),var(--brand));color:#fff;box-shadow:0 8px 20px rgba(198,40,40,.28)}
.btn-primary:hover{background:linear-gradient(135deg,var(--brand),var(--brand-dark));box-shadow:0 12px 28px rgba(198,40,40,.38)}
.btn-ghost{background:transparent;color:var(--brand);border-color:var(--brand)}
.btn-ghost:hover{background:var(--bg-alt);box-shadow:0 8px 20px rgba(198,40,40,.12)}
.hero-stats{display:flex;gap:28px;flex-wrap:wrap}
.stat b{display:block;font-size:26px;color:var(--brand);font-weight:800;line-height:1.2;font-variant-numeric:tabular-nums}
.stat span{font-size:13px;color:var(--text-mute)}
.hero-visual{position:relative}
.hero-carousel{position:relative;border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow);background:var(--bg);transition:box-shadow .35s}
.hero-carousel:hover{box-shadow:var(--shadow-hover)}
.slide{display:none}
.slide.active{display:block;animation:fadeIn .6s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.slide svg{width:100%;height:auto;display:block}
.carousel-dots{position:absolute;bottom:14px;left:0;right:0;display:flex;justify-content:center;gap:8px}
.carousel-dots button{width:10px;height:10px;border-radius:50%;border:0;background:rgba(255,255,255,.55);cursor:pointer;padding:0;transition:width .3s,background .3s}
.carousel-dots button.active{background:#fff;width:26px;border-radius:6px}

/* sections */
section{padding:64px 0;border-bottom:1px solid var(--border);position:relative}
section:nth-of-type(even){background:var(--bg-soft)}
.section-head{max-width:820px;margin-bottom:36px}
.section-head h2{font-size:clamp(22px,2.6vw,30px);font-weight:800;margin-bottom:12px;line-height:1.4}
.section-head p{color:var(--text-soft);font-size:16px}
.eyebrow{display:inline-block;font-size:13px;font-weight:700;color:var(--brand);letter-spacing:2px;margin-bottom:10px;text-transform:uppercase}
h3{font-size:20px;font-weight:700;margin-bottom:10px;line-height:1.5}
h4{font-size:17px;font-weight:700;margin-bottom:8px;line-height:1.5}
p{margin-bottom:14px;color:var(--text-soft)}
.grid{display:grid;gap:22px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{
background:var(--glass-bg);
-webkit-backdrop-filter:blur(12px);
backdrop-filter:blur(12px);
border:1px solid var(--glass-border);
border-radius:var(--radius);
padding:24px;
box-shadow:var(--shadow);
transition:transform .3s cubic-bezier(.22,.61,.36,1),box-shadow .3s,border-color .3s;
}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:rgba(198,40,40,.25)}
.card .icon{width:46px;height:46px;border-radius:12px;background:var(--bg-alt);display:grid;place-items:center;margin-bottom:14px;transition:transform .3s,background .3s}
.card:hover .icon{transform:scale(1.1) rotate(-4deg);background:rgba(198,40,40,.12)}
.card p:last-child{margin-bottom:0}
.reveal{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease}
.reveal.visible{opacity:1;transform:none}

/* brand story */
.story{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:start}
.timeline{position:relative;padding-left:24px;border-left:2px solid var(--border);margin-top:8px}
.timeline li{position:relative;padding-bottom:22px}
.timeline li::before{content:"";position:absolute;left:-32px;top:6px;width:12px;height:12px;border-radius:50%;background:var(--brand);box-shadow:0 0 0 4px var(--bg-alt);transition:transform .3s}
.timeline li:hover::before{transform:scale(1.3)}
.timeline b{display:block;color:var(--brand);font-size:15px;margin-bottom:4px}
.timeline p{margin:0;font-size:15px}
.quote-box{background:var(--bg-alt);border-left:4px solid var(--brand);border-radius:0 12px 12px 0;padding:20px 22px;margin-top:20px;font-size:15px;color:var(--text-soft);transition:background .3s,transform .3s}
.quote-box:hover{transform:translateX(4px)}

/* products */
.product-card{display:flex;flex-direction:column;height:100%}
.product-card .tag{display:inline-block;font-size:12px;background:var(--bg-alt);color:var(--brand);padding:3px 10px;border-radius:999px;margin-bottom:10px;font-weight:600;align-self:flex-start;transition:background .25s,color .25s}
.product-card:hover .tag{background:var(--brand);color:#fff}
.product-card ul{margin:10px 0 0;padding-left:0}
.product-card ul li{position:relative;padding-left:20px;font-size:14.5px;color:var(--text-soft);margin-bottom:6px}
.product-card ul li::before{content:"✓";position:absolute;left:0;color:var(--brand);font-weight:700}

/* cases */
.case-card{display:flex;flex-direction:column;gap:12px}
.case-meta{font-size:13px;color:var(--text-mute)}
.case-quote{font-style:normal;background:var(--bg-alt);border-radius:10px;padding:14px 16px;font-size:14.5px;color:var(--text-soft);border-left:3px solid var(--brand-light);transition:background .3s}

/* article list */
.article-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.article-card{
background:var(--glass-bg);
-webkit-backdrop-filter:blur(12px);
backdrop-filter:blur(12px);
border:1px solid var(--glass-border);
border-radius:var(--radius);
padding:24px;
box-shadow:var(--shadow);
display:flex;flex-direction:column;
transition:transform .3s cubic-bezier(.22,.61,.36,1),box-shadow .3s,border-color .3s;
}
.article-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:rgba(198,40,40,.25)}
.article-card .meta{font-size:13px;color:var(--text-mute);margin-bottom:8px;display:flex;gap:12px;flex-wrap:wrap}
.article-card h3{font-size:18px;transition:color .2s}
.article-card:hover h3{color:var(--brand)}
.article-card p{font-size:15px;flex:1}
.read-more{font-weight:600;font-size:14.5px;align-self:flex-start;transition:transform .25s}
.article-card:hover .read-more{transform:translateX(4px)}

/* faq */
.faq-list{max-width:900px}
.faq-item{border:1px solid var(--border);border-radius:12px;margin-bottom:12px;background:var(--bg);overflow:hidden;transition:border-color .25s,box-shadow .25s}
.faq-item:hover{border-color:rgba(198,40,40,.3)}
.faq-item.open{border-color:var(--brand-light);box-shadow:0 6px 20px rgba(198,40,40,.1)}
.faq-q{width:100%;text-align:left;background:transparent;border:0;padding:18px 52px 18px 20px;font-size:16px;font-weight:600;color:var(--text);cursor:pointer;position:relative;font-family:inherit;line-height:1.6;transition:color .2s}
.faq-q:hover{color:var(--brand)}
.faq-q::after{content:"+";position:absolute;right:20px;top:50%;transform:translateY(-50%);font-size:22px;color:var(--brand);font-weight:400;transition:transform .3s}
.faq-item.open .faq-q::after{transform:translateY(-50%) rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .4s ease}
.faq-a-inner{padding:0 20px 20px;color:var(--text-soft);font-size:15px}
.faq-a-inner p:last-child{margin-bottom:0}

/* howto */
.steps{counter-reset:step;display:grid;gap:16px}
.step{position:relative;background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:20px 22px 20px 66px;box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s,border-color .25s}
.step:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover);border-color:rgba(198,40,40,.25)}
.step::before{counter-increment:step;content:counter(step);position:absolute;left:18px;top:18px;width:32px;height:32px;border-radius:50%;background:linear-gradient(135deg,var(--brand-light),var(--brand));color:#fff;display:grid;place-items:center;font-weight:700;font-size:15px;transition:transform .3s}
.step:hover::before{transform:scale(1.12)}
.step h4{margin-bottom:6px}
.step p{margin:0;font-size:15px}
.howto-meta{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-bottom:26px}
.howto-meta .card p:last-child{margin-bottom:0}

/* contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px}
.contact-info dl{display:grid;grid-template-columns:auto 1fr;gap:10px 16px;font-size:15px}
.contact-info dt{color:var(--text-mute);font-weight:600}
.contact-info dd{color:var(--text-soft)}
.contact-form{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.field{margin-bottom:14px;display:flex;flex-direction:column;gap:6px}
.field label{font-size:14px;font-weight:600;color:var(--text-soft)}
.field input,.field textarea,.field select{font-family:inherit;font-size:15px;padding:10px 12px;border:1px solid var(--border);border-radius:10px;background:var(--bg-soft);color:var(--text);outline:none;transition:border-color .2s,box-shadow .2s,background .2s}
.field input:focus,.field textarea:focus,.field select:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(198,40,40,.12);background:var(--bg)}
.field textarea{resize:vertical;min-height:110px}
.form-note{font-size:13px;color:var(--text-mute);margin-top:10px}

/* footer */
.site-footer{background:var(--bg-soft);border-top:1px solid var(--border);padding:56px 0 28px;font-size:14.5px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;margin-bottom:36px}
.footer-grid h4{font-size:15px;margin-bottom:14px;color:var(--text)}
.footer-grid ul li{margin-bottom:8px}
.footer-grid a{color:var(--text-soft);font-size:14px;transition:color .2s,padding-left .2s}
.footer-grid a:hover{color:var(--brand);padding-left:3px;text-decoration:none}
.footer-brand p{font-size:14px;color:var(--text-soft);margin-bottom:12px}
.footer-bottom{border-top:1px solid var(--border);padding-top:22px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--text-mute)}
.footer-bottom a{color:var(--text-mute)}
.footer-bottom a:hover{color:var(--brand)}

/* back to top */
.back-top{position:fixed;right:22px;bottom:22px;width:46px;height:46px;border-radius:50%;background:linear-gradient(135deg,var(--brand-light),var(--brand));color:#fff;border:0;cursor:pointer;display:grid;place-items:center;font-size:18px;box-shadow:0 8px 20px rgba(198,40,40,.35);opacity:0;visibility:hidden;transform:translateY(12px);transition:all .3s;z-index:900}
.back-top.show{opacity:1;visibility:visible;transform:none}
.back-top:hover{transform:translateY(-3px) scale(1.06);box-shadow:0 12px 28px rgba(198,40,40,.5)}

/* breadcrumb */
.breadcrumb{font-size:13.5px;color:var(--text-mute);padding:14px 0;border-bottom:1px solid var(--border);background:var(--bg)}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.breadcrumb li:not(:last-child)::after{content:"›";margin-left:6px;color:var(--text-mute)}
.breadcrumb a{color:var(--text-mute);transition:color .2s}
.breadcrumb a:hover{color:var(--brand)}

/* media */
@media (max-width:980px){
.hero-inner{grid-template-columns:1fr;padding:40px 0 48px}
.story{grid-template-columns:1fr}
.grid-4{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(2,1fr)}
.article-grid{grid-template-columns:1fr}
.contact-grid{grid-template-columns:1fr}
.footer-grid{grid-template-columns:1fr 1fr}
.howto-meta{grid-template-columns:1fr}
}
@media (max-width:760px){
.main-nav{position:fixed;top:68px;left:0;right:0;background:var(--glass-bg);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-bottom:1px solid var(--border);padding:12px 16px;display:none;box-shadow:0 12px 24px rgba(0,0,0,.08);max-height:calc(100vh - 68px);overflow:auto}
.main-nav.open{display:block;animation:fadeIn .3s ease}
.main-nav ul{flex-direction:column;gap:2px}
.menu-toggle{display:grid}
.search-box{display:none}
.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
.form-row{grid-template-columns:1fr}
.hero-stats{gap:18px}
section{padding:44px 0}
.footer-grid{grid-template-columns:1fr}
.hero h1 .hl{white-space:normal}
}
@media (prefers-reduced-motion:reduce){
*{animation:none!important;transition:none!important;scroll-behavior:auto!important}
.reveal{opacity:1;transform:none}
}
@media print{
.site-header,.back-top,.hero-carousel,.search-box,.icon-btn{display:none!important}
body{background:#fff;color:#000}
section{padding:20px 0;border:0}
}