:root{
  --brand:#e63946;
  --brand-2:#2a9d8f;
  --accent:#f4a261;
  --text:#22262b;
  --text-soft:#5a626b;
  --bg:#ffffff;
  --bg-alt:#f7f8fa;
  --card:#ffffff;
  --border:#e6e8eb;
  --shadow:0 8px 24px rgba(0,0,0,.06);
  --radius:14px;
  --maxw:1180px;
  --glass:rgba(255,255,255,.72);
  --glass-border:rgba(255,255,255,.55);
  --grad-1:#e63946;
  --grad-2:#f4a261;
  --grad-3:#2a9d8f;
}
[data-theme="dark"]{
  --text:#e8eaed;
  --text-soft:#a7adb5;
  --bg:#14171a;
  --bg-alt:#1b1f23;
  --card:#1f2429;
  --border:#2c3238;
  --shadow:0 8px 24px rgba(0,0,0,.4);
  --glass:rgba(31,36,41,.66);
  --glass-border:rgba(255,255,255,.12);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.75;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  transition:background .3s,color .3s;
}
a{color:var(--brand);text-decoration:none;transition:color .25s ease}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.35;margin:0 0 .6em}
h1{font-size:clamp(1.6rem,3vw,2.4rem)}
h2{font-size:clamp(1.35rem,2.4vw,1.9rem)}
h3{font-size:clamp(1.1rem,1.8vw,1.3rem)}
h4{font-size:1.02rem;color:var(--text-soft)}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.3em}
img,svg{max-width:100%}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip-link{position:absolute;left:-999px;top:0;background:var(--brand);color:#fff;padding:10px 16px;z-index:999;border-radius:0 0 8px 0}
.skip-link:focus{left:8px;top:8px}

/* Header */
.site-header{
  position:sticky;top:0;z-index:100;
  background:var(--glass);
  -webkit-backdrop-filter:blur(14px) saturate(160%);
  backdrop-filter:blur(14px) saturate(160%);
  border-bottom:1px solid var(--border);
  transition:box-shadow .3s ease,background .3s ease;
}
.site-header.scrolled{box-shadow:var(--shadow)}
.header-inner{
  max-width:var(--maxw);margin:0 auto;padding:.7rem 1.2rem;
  display:flex;align-items:center;gap:1.2rem;flex-wrap:wrap;
}
.brand{display:flex;align-items:center;gap:.6rem;flex-shrink:0}
.brand-logo{transition:transform .4s cubic-bezier(.2,.8,.2,1)}
.brand:hover .brand-logo{transform:rotate(-8deg) scale(1.06)}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-name{font-weight:700;font-size:1.1rem}
.brand-slogan{font-size:.75rem;color:var(--text-soft)}
.main-nav{margin-left:auto}
.main-nav ul{display:flex;gap:1.1rem;list-style:none;margin:0;padding:0;flex-wrap:wrap}
.main-nav a{color:var(--text);font-size:.92rem;position:relative;padding-bottom:2px}
.main-nav a::after{
  content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;
  background:linear-gradient(90deg,var(--grad-1),var(--grad-2));
  transition:width .3s ease;border-radius:2px;
}
.main-nav a:hover{color:var(--brand);text-decoration:none}
.main-nav a:hover::after{width:100%}
.header-tools{display:flex;align-items:center;gap:.5rem}
.site-search{display:flex;align-items:center;border:1px solid var(--border);border-radius:999px;overflow:hidden;background:var(--bg-alt);transition:border-color .3s,box-shadow .3s}
.site-search:focus-within{border-color:var(--brand);box-shadow:0 0 0 3px rgba(230,57,70,.15)}
.site-search input{
  border:0;background:transparent;color:var(--text);
  padding:.45rem .8rem;font-size:.88rem;width:180px;outline:none;
}
.site-search button{
  border:0;background:linear-gradient(135deg,var(--grad-1),var(--grad-2));color:#fff;padding:.45rem .7rem;cursor:pointer;
  display:flex;align-items:center;transition:filter .25s ease;
}
.site-search button:hover{filter:brightness(1.1)}
.theme-toggle,.menu-toggle{
  border:1px solid var(--border);background:var(--bg-alt);color:var(--text);
  width:38px;height:38px;border-radius:50%;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  transition:transform .3s ease,background .3s ease,border-color .3s ease;
}
.theme-toggle:hover{transform:rotate(25deg);border-color:var(--brand);color:var(--brand)}
.menu-toggle{display:none;flex-direction:column;gap:4px}
.menu-toggle span{width:16px;height:2px;background:var(--text);display:block;transition:transform .3s ease,opacity .3s ease}
.mobile-menu{display:none;border-top:1px solid var(--border);background:var(--bg)}
.mobile-menu ul{list-style:none;margin:0;padding:.6rem 1.2rem}
.mobile-menu li{padding:.5rem 0;border-bottom:1px solid var(--border)}
.mobile-menu li:last-child{border-bottom:0}

/* Breadcrumb */
.breadcrumb{max-width:var(--maxw);margin:0 auto;padding:.8rem 1.2rem 0}
.breadcrumb ol{list-style:none;display:flex;gap:.4rem;padding:0;margin:0;font-size:.85rem;color:var(--text-soft);flex-wrap:wrap}
.breadcrumb li+li::before{content:"/";margin-right:.4rem;color:var(--border)}

/* Hero */
.hero{max-width:var(--maxw);margin:1rem auto 0;padding:0 1.2rem}
.hero-slider{
  position:relative;border-radius:calc(var(--radius) + 6px);overflow:hidden;
  border:1px solid var(--glass-border);
  background:
    radial-gradient(1200px 400px at 10% -10%,rgba(230,57,70,.18),transparent 60%),
    radial-gradient(900px 400px at 100% 0%,rgba(244,162,97,.22),transparent 55%),
    linear-gradient(135deg,rgba(42,157,143,.12),rgba(230,57,70,.08));
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  box-shadow:var(--shadow);
}
.slide{display:none;gap:2rem;padding:2.6rem;align-items:center;grid-template-columns:1.4fr 1fr}
.slide.is-active{display:grid;animation:slideIn .6s cubic-bezier(.2,.8,.2,1)}
@keyframes slideIn{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
.slide-text h1,.slide-text h2{margin-top:0}
.slide-text h1{
  background:linear-gradient(120deg,var(--grad-1),var(--grad-2) 60%,var(--grad-3));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.slide-text p{color:var(--text-soft);max-width:56ch}
.slide-meta{font-size:.82rem;color:var(--text-soft)}
.slide-visual{display:flex;justify-content:center}
.slide-visual svg{filter:drop-shadow(0 12px 28px rgba(0,0,0,.12));border-radius:18px}
.btn-primary{
  display:inline-block;background:linear-gradient(135deg,var(--grad-1),var(--grad-2));color:#fff;
  padding:.65rem 1.4rem;border-radius:999px;font-size:.92rem;margin-top:.6rem;font-weight:600;
  box-shadow:0 8px 20px rgba(230,57,70,.28);
  transition:transform .3s cubic-bezier(.2,.8,.2,1),box-shadow .3s ease,filter .3s ease;
}
.btn-primary:hover{text-decoration:none;transform:translateY(-2px);box-shadow:0 12px 26px rgba(230,57,70,.38);filter:brightness(1.05)}
.btn-primary:active{transform:translateY(0)}
.slider-controls{position:absolute;bottom:1rem;right:1.2rem;display:flex;align-items:center;gap:.6rem;z-index:2}
.slider-prev,.slider-next{
  border:1px solid var(--glass-border);background:var(--glass);color:var(--text);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  width:34px;height:34px;border-radius:50%;cursor:pointer;font-size:1.1rem;line-height:1;
  transition:transform .3s ease,background .3s ease,color .3s ease;
}
.slider-prev:hover,.slider-next:hover{background:var(--brand);color:#fff;transform:scale(1.08);border-color:var(--brand)}
.slider-dots{display:flex;gap:.4rem}
.slider-dots button{
  width:9px;height:9px;border-radius:50%;border:0;background:var(--border);cursor:pointer;padding:0;
  transition:background .3s ease,transform .3s ease,width .3s ease;
}
.slider-dots button.active{background:linear-gradient(90deg,var(--grad-1),var(--grad-2));width:22px;border-radius:999px}

/* Stats */
.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem;margin:1.2rem 0 0}
.stat{
  background:var(--glass);border:1px solid var(--glass-border);border-radius:var(--radius);
  padding:1.1rem;text-align:center;
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  box-shadow:var(--shadow);
  transition:transform .35s cubic-bezier(.2,.8,.2,1),box-shadow .35s ease;
}
.stat:hover{transform:translateY(-4px);box-shadow:0 14px 30px rgba(0,0,0,.12)}
.stat-num{display:block;font-size:1.5rem;font-weight:800;letter-spacing:.5px;
  background:linear-gradient(120deg,var(--grad-1),var(--grad-2));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.stat-label{font-size:.82rem;color:var(--text-soft)}

/* Sections */
.section{max-width:var(--maxw);margin:0 auto;padding:3rem 1.2rem}
.section.alt{background:var(--bg-alt);max-width:none;padding:3rem 0}
.section.alt > *{max-width:var(--maxw);margin-left:auto;margin-right:auto;padding-left:1.2rem;padding-right:1.2rem}
.section-head{margin-bottom:1.6rem}
.section-head h2{position:relative;display:inline-block;padding-bottom:.35rem}
.section-head h2::after{
  content:"";position:absolute;left:0;bottom:0;width:56px;height:4px;border-radius:4px;
  background:linear-gradient(90deg,var(--grad-1),var(--grad-2));
}
.section-desc{color:var(--text-soft);max-width:70ch}

/* Grids & cards */
.grid-2{display:grid;grid-template-columns:1.6fr 1fr;gap:2rem}
.grid-3{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.2rem}
.card,.case-card,.topic-card,.article-item,.howto-block,.info-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow);
  transition:transform .35s cubic-bezier(.2,.8,.2,1),box-shadow .35s ease,border-color .35s ease;
}
.card,.case-card,.topic-card{padding:1.4rem}
.card:hover,.case-card:hover,.topic-card:hover,.article-item:hover,.howto-block:hover{
  transform:translateY(-5px);
  box-shadow:0 16px 36px rgba(0,0,0,.12);
  border-color:rgba(230,57,70,.35);
}
.card{position:relative;overflow:hidden}
.card::before{
  content:"";position:absolute;inset:0 0 auto 0;height:3px;
  background:linear-gradient(90deg,var(--grad-1),var(--grad-2),var(--grad-3));
  transform:scaleX(0);transform-origin:left;transition:transform .4s ease;
}
.card:hover::before{transform:scaleX(1)}
.card-icon{width:48px;height:48px;margin-bottom:.6rem;transition:transform .4s cubic-bezier(.2,.8,.2,1)}
.card:hover .card-icon{transform:scale(1.1) rotate(-4deg)}
.info-card{padding:1.4rem;align-self:start}
.info-card dl{display:grid;grid-template-columns:auto 1fr;gap:.4rem 1rem;margin:0 0 1rem;font-size:.9rem}
.info-card dt{color:var(--text-soft)}
.info-card dd{margin:0}

/* Timeline list */
.timeline-list{list-style:none;padding:0;border-left:2px solid var(--border);margin-left:.4rem}
.timeline-list li{position:relative;padding:.3rem 0 .9rem 1.2rem;color:var(--text-soft);transition:color .3s ease}
.timeline-list li::before{
  content:"";position:absolute;left:-6px;top:.7rem;width:9px;height:9px;border-radius:50%;
  background:linear-gradient(135deg,var(--grad-1),var(--grad-2));
  transition:transform .3s ease;
}
.timeline-list li:hover{color:var(--text)}
.timeline-list li:hover::before{transform:scale(1.4)}
.timeline-list strong{color:var(--text)}
.scene-list li{margin-bottom:.5rem}

/* Cases */
.case-card blockquote{
  margin:.8rem 0 .4rem;padding-left:.8rem;border-left:3px solid var(--accent);
  color:var(--text-soft);font-style:italic;
}
.case-card cite{font-size:.82rem;color:var(--text-soft)}

/* Articles */
.article-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1.2rem}
.article-item{padding:1.3rem}
.article-item h3{margin-bottom:.3rem}
.article-item h3 a{color:var(--text)}
.article-item h3 a:hover{color:var(--brand);text-decoration:none}
.article-meta{font-size:.8rem;color:var(--text-soft);margin-bottom:.5rem}
.article-summary{color:var(--text-soft);font-size:.94rem}
.read-more{font-size:.9rem;font-weight:600;display:inline-flex;align-items:center;gap:.3rem}
.read-more::after{content:"→";transition:transform .3s ease}
.read-more:hover{text-decoration:none}
.read-more:hover::after{transform:translateX(4px)}

/* HowTo */
.howto-wrap{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.2rem}
.howto-block{padding:1.3rem}
.howto-steps{counter-reset:step;list-style:none;padding:0}
.howto-steps li{position:relative;padding-left:2.2rem;margin-bottom:.7rem}
.howto-steps li::before{
  counter-increment:step;content:counter(step);
  position:absolute;left:0;top:.1rem;width:1.6rem;height:1.6rem;border-radius:50%;
  background:linear-gradient(135deg,var(--grad-1),var(--grad-2));color:#fff;
  font-size:.8rem;font-weight:700;display:flex;align-items:center;justify-content:center;
}

/* News */
.news-list{list-style:none;padding:0}
.news-list li{
  display:flex;gap:1rem;padding:.8rem .2rem;border-bottom:1px solid var(--border);flex-wrap:wrap;
  transition:padding-left .3s ease,background .3s ease;
}
.news-list li:hover{padding-left:.6rem;background:var(--bg-alt)}
.news-list time{color:var(--text-soft);font-size:.85rem;min-width:90px}

/* FAQ */
.faq-list{display:flex;flex-direction:column;gap:.7rem}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:border-color .3s ease}
.faq-item:hover{border-color:rgba(230,57,70,.3)}
.faq-question{
  width:100%;text-align:left;background:transparent;border:0;color:var(--text);
  font-size:1rem;font-weight:600;padding:1rem 1.2rem;cursor:pointer;
  display:flex;justify-content:space-between;align-items:center;gap:1rem;
  transition:color .3s ease;
}
.faq-question:hover{color:var(--brand)}
.faq-question::after{content:"+";font-size:1.3rem;color:var(--brand);transition:transform .3s ease;line-height:1}
.faq-question[aria-expanded="true"]::after{transform:rotate(45deg)}
.faq-answer{padding:0 1.2rem 1rem;color:var(--text-soft);font-size:.95rem;animation:fadeDown .35s ease}
@keyframes fadeDown{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}

/* Footer */
.site-footer{background:var(--bg-alt);border-top:1px solid var(--border);margin-top:2rem}
.footer-inner{
  max-width:var(--maxw);margin:0 auto;padding:2.6rem 1.2rem;
  display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:2rem;
}
.footer-col h2,.footer-col h3{font-size:1rem;margin-bottom:.6rem}
.footer-col p,.footer-col li{font-size:.88rem;color:var(--text-soft)}
.footer-col ul{list-style:none;padding:0}
.footer-col li{padding:.2rem 0}
.footer-col a{color:var(--text-soft)}
.footer-col a:hover{color:var(--brand)}
.footer-col address{font-style:normal}
.footer-bottom{
  border-top:1px solid var(--border);max-width:var(--maxw);margin:0 auto;
  padding:1rem 1.2rem;display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;
  font-size:.82rem;color:var(--text-soft);
}

/* Back to top */
.back-to-top{
  position:fixed;right:1.2rem;bottom:1.2rem;z-index:120;
  width:46px;height:46px;border-radius:50%;border:0;
  background:linear-gradient(135deg,var(--grad-1),var(--grad-2));color:#fff;
  cursor:pointer;display:flex;align-items:center;justify-content:center;
  box-shadow:0 10px 24px rgba(230,57,70,.35);
  transition:transform .3s cubic-bezier(.2,.8,.2,1),box-shadow .3s ease;
}
.back-to-top:hover{transform:translateY(-4px) scale(1.05);box-shadow:0 14px 30px rgba(230,57,70,.45)}

/* Reveal animation */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s cubic-bezier(.2,.8,.2,1)}
.reveal.visible{opacity:1;transform:none}

/* Focus visibility */
a:focus-visible,button:focus-visible,input:focus-visible{
  outline:2px solid var(--brand);outline-offset:2px;border-radius:4px;
}

/* Responsive */
@media (max-width:1080px){
  .main-nav ul{gap:.8rem}
  .site-search input{width:150px}
}
@media (max-width:960px){
  .main-nav{display:none}
  .menu-toggle{display:flex}
  .site-search input{width:130px}
  .grid-2{grid-template-columns:1fr}
  .slide{grid-template-columns:1fr;padding:1.8rem}
  .hero-stats{grid-template-columns:repeat(2,1fr)}
  .slider-controls{position:static;justify-content:center;padding:0 0 1rem}
}
@media (max-width:600px){
  body{font-size:15.5px}
  .header-inner{padding:.6rem .9rem;gap:.7rem}
  .header-tools{width:100%;justify-content:flex-end}
  .site-search{flex:1}
  .site-search input{width:100%}
  .mobile-menu:not([hidden]){display:block}
  .hero-stats{grid-template-columns:1fr 1fr;gap:.7rem}
  .stat{padding:.9rem .6rem}
  .stat-num{font-size:1.25rem}
  .slide-visual{display:none}
  .section{padding:2.2rem 1rem}
  .section.alt{padding:2.2rem 0}
  .section.alt > *{padding-left:1rem;padding-right:1rem}
  .slide{padding:1.4rem}
  .footer-inner{padding:2rem 1rem;gap:1.4rem}
  .footer-bottom{flex-direction:column;gap:.4rem}
  .back-to-top{right:.9rem;bottom:.9rem;width:42px;height:42px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
}
@media print{
  .site-header,.back-to-top,.slider-controls,.hero-stats,.mobile-menu{display:none!important}
  body{color:#000;background:#fff}
  .section.alt{background:#fff}
  a{color:#000;text-decoration:underline}
}