:root{
  --brand:#ff5a5f;
  --brand-dark:#d94146;
  --brand-soft:#fff1f1;
  --brand-grad:linear-gradient(135deg,#ff5a5f 0%,#ff8a5c 50%,#ffb347 100%);
  --brand-grad-soft:linear-gradient(135deg,rgba(255,90,95,.12) 0%,rgba(255,179,71,.12) 100%);
  --ink:#1f2328;
  --ink-soft:#4a5158;
  --line:#e8ebef;
  --bg:#ffffff;
  --bg-soft:#f7f8fa;
  --glass:rgba(255,255,255,.72);
  --glass-line:rgba(255,255,255,.55);
  --radius:16px;
  --radius-sm:12px;
  --shadow:0 6px 24px rgba(31,35,40,.08);
  --shadow-lg:0 18px 48px rgba(255,90,95,.18);
  --ease:cubic-bezier(.22,.68,.34,1);
}
html[data-theme="dark"]{
  --brand:#ff7a7e;
  --brand-dark:#ff5a5f;
  --brand-soft:#2a1f20;
  --brand-grad:linear-gradient(135deg,#ff5a5f 0%,#c2447a 55%,#7d4bd8 100%);
  --brand-grad-soft:linear-gradient(135deg,rgba(255,90,95,.18) 0%,rgba(125,75,216,.18) 100%);
  --ink:#eef1f4;
  --ink-soft:#b6bec7;
  --line:#2b3138;
  --bg:#14181c;
  --bg-soft:#1b2025;
  --glass:rgba(27,32,37,.72);
  --glass-line:rgba(255,255,255,.08);
  --shadow:0 6px 24px rgba(0,0,0,.5);
  --shadow-lg:0 18px 48px rgba(0,0,0,.6);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans SC",sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.85;
  font-size:16px;
  transition:background .35s var(--ease),color .35s var(--ease);
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  background:
    radial-gradient(720px 420px at 12% -6%,var(--brand-grad-soft),transparent 62%),
    radial-gradient(680px 420px at 92% 4%,var(--brand-grad-soft),transparent 60%);
  pointer-events:none;
}
img,svg{max-width:100%;display:block}
a{color:var(--brand-dark);text-decoration:none;transition:color .25s var(--ease)}
a:hover{text-decoration:underline}
.wrap{max-width:1160px;margin:0 auto;padding:0 20px}
::selection{background:var(--brand);color:#fff}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--bg-soft)}
::-webkit-scrollbar-thumb{background:var(--brand);border-radius:8px;border:2px solid var(--bg-soft)}
::-webkit-scrollbar-thumb:hover{background:var(--brand-dark)}

/* 顶部导航 */
.topbar{
  position:sticky;top:0;z-index:50;
  background:var(--glass);
  border-bottom:1px solid var(--line);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  transition:background .35s var(--ease),border-color .35s var(--ease);
}
.topbar-inner{display:flex;align-items:center;gap:18px;height:64px}
.logo{
  display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;
  color:var(--ink);letter-spacing:.5px;transition:transform .3s var(--ease)
}
.logo:hover{text-decoration:none;transform:translateY(-1px)}
.logo svg{width:34px;height:34px;filter:drop-shadow(0 4px 10px rgba(255,90,95,.35));transition:transform .4s var(--ease)}
.logo:hover svg{transform:rotate(-8deg) scale(1.06)}
.nav{display:flex;gap:6px;margin-left:auto;flex-wrap:wrap}
.nav a{
  position:relative;padding:8px 12px;border-radius:10px;color:var(--ink-soft);
  font-size:15px;font-weight:600;transition:all .28s var(--ease)
}
.nav a::after{
  content:"";position:absolute;left:12px;right:12px;bottom:4px;height:2px;border-radius:2px;
  background:var(--brand-grad);transform:scaleX(0);transform-origin:left;
  transition:transform .3s var(--ease)
}
.nav a:hover{background:var(--brand-soft);color:var(--brand-dark);text-decoration:none;transform:translateY(-2px)}
.nav a:hover::after{transform:scaleX(1)}
.tools{display:flex;align-items:center;gap:8px}
.search-box{
  display:flex;align-items:center;border:1px solid var(--line);border-radius:12px;
  overflow:hidden;background:var(--bg-soft);transition:box-shadow .3s var(--ease),border-color .3s var(--ease)
}
.search-box:focus-within{border-color:var(--brand);box-shadow:0 0 0 4px rgba(255,90,95,.14)}
.search-box input{
  border:0;background:transparent;padding:8px 10px;outline:none;color:var(--ink);
  width:130px;font-size:14px;font-family:inherit
}
.search-box input::placeholder{color:var(--ink-soft);opacity:.75}
.search-box button{
  border:0;background:var(--brand-grad);color:#fff;padding:9px 14px;cursor:pointer;
  font-size:14px;font-family:inherit;font-weight:600;transition:filter .25s var(--ease)
}
.search-box button:hover{filter:brightness(1.08)}
.icon-btn{
  border:1px solid var(--line);background:var(--bg-soft);color:var(--ink);
  width:38px;height:38px;border-radius:12px;cursor:pointer;
  display:flex;align-items:center;justify-content:center;font-size:16px;
  transition:all .28s var(--ease)
}
.icon-btn:hover{border-color:var(--brand);color:var(--brand-dark);transform:translateY(-2px);box-shadow:var(--shadow)}
.menu-btn{display:none}

/* 面包屑 */
.crumbs{padding:14px 0;font-size:14px;color:var(--ink-soft)}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0}
.crumbs li::after{content:"›";margin-left:6px;color:var(--ink-soft)}
.crumbs li:last-child::after{content:""}
.crumbs a{color:var(--ink-soft)}
.crumbs a:hover{color:var(--brand-dark)}

/* Banner */
.banner{
  position:relative;border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow-lg);background:var(--bg-soft);
  border:1px solid var(--glass-line)
}
.banner::before{
  content:"";position:absolute;inset:0;z-index:0;
  background:var(--brand-grad);opacity:.10;pointer-events:none
}
.banner::after{
  content:"";position:absolute;top:-40%;right:-10%;width:60%;height:180%;z-index:0;
  background:radial-gradient(closest-side,rgba(255,255,255,.5),transparent);
  opacity:.35;pointer-events:none;animation:auroraFloat 12s ease-in-out infinite alternate
}
@keyframes auroraFloat{
  from{transform:translate3d(0,0,0) scale(1)}
  to{transform:translate3d(-40px,30px,0) scale(1.15)}
}
.slides{position:relative;height:340px;z-index:1}
.slide{
  position:absolute;inset:0;opacity:0;visibility:hidden;
  transition:opacity .7s var(--ease),visibility .7s var(--ease),transform .7s var(--ease);
  transform:translateY(14px);
  display:flex;align-items:center;gap:24px;padding:32px 40px
}
.slide.active{opacity:1;visibility:visible;transform:none}
.slide-text{flex:1;min-width:0}
.slide-text h2{
  font-size:28px;margin:0 0 10px;color:var(--ink);line-height:1.35;
  background:var(--brand-grad);-webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent
}
.slide-text p{margin:0 0 16px;color:var(--ink-soft)}
.slide-art{flex:0 0 300px;max-width:40%;transition:transform .6s var(--ease)}
.slide.active .slide-art{animation:artIn .8s var(--ease) both}
@keyframes artIn{
  from{opacity:0;transform:translateY(18px) scale(.96)}
  to{opacity:1;transform:none}
}
.slide-art svg{filter:drop-shadow(0 12px 28px rgba(255,90,95,.22))}
.btn{
  display:inline-block;background:var(--brand-grad);color:#fff;padding:10px 20px;
  border-radius:12px;font-weight:700;border:0;cursor:pointer;font-size:15px;font-family:inherit;
  transition:transform .28s var(--ease),box-shadow .28s var(--ease),filter .28s var(--ease);
  box-shadow:0 8px 20px rgba(255,90,95,.28)
}
.btn:hover{background:var(--brand-grad);filter:brightness(1.06);text-decoration:none;color:#fff;transform:translateY(-3px);box-shadow:0 14px 30px rgba(255,90,95,.36)}
.btn:active{transform:translateY(-1px)}
.btn.ghost{
  background:transparent;color:var(--brand-dark);border:1px solid var(--brand);box-shadow:none
}
.btn.ghost:hover{background:var(--brand-soft);box-shadow:0 8px 20px rgba(255,90,95,.16)}
.dots{
  position:absolute;bottom:14px;left:50%;transform:translateX(-50%);
  display:flex;gap:8px;z-index:2
}
.dots button{
  width:10px;height:10px;border-radius:50%;border:0;background:rgba(255,90,95,.35);
  cursor:pointer;transition:all .3s var(--ease)
}
.dots button:hover{background:rgba(255,90,95,.6);transform:scale(1.15)}
.dots button.active{background:var(--brand-grad);width:26px;border-radius:6px;box-shadow:0 4px 12px rgba(255,90,95,.4)}

/* 区块 */
section{padding:44px 0;border-bottom:1px solid var(--line)}
section:last-of-type{border-bottom:0}
h1{
  font-size:34px;line-height:1.4;margin:24px 0 12px;
  background:var(--brand-grad);-webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;letter-spacing:.3px
}
h2{font-size:26px;margin:0 0 16px;position:relative;padding-left:16px;color:var(--ink)}
h2::before{
  content:"";position:absolute;left:0;top:8px;bottom:8px;width:5px;border-radius:3px;
  background:var(--brand-grad);box-shadow:0 0 12px rgba(255,90,95,.4)
}
h3{font-size:20px;margin:22px 0 10px;color:var(--ink)}
h4{font-size:17px;margin:16px 0 8px;color:var(--ink-soft)}
p{margin:0 0 14px;color:var(--ink-soft)}
.lead{font-size:17px;color:var(--ink)}
.grid{display:grid;gap:18px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{
  position:relative;background:var(--glass);border:1px solid var(--line);
  border-radius:var(--radius);padding:20px;
  backdrop-filter:saturate(160%) blur(10px);-webkit-backdrop-filter:saturate(160%) blur(10px);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease);
  overflow:hidden
}
.card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:var(--brand-grad);transform:scaleX(0);transform-origin:left;
  transition:transform .4s var(--ease)
}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:transparent}
.card:hover::before{transform:scaleX(1)}
.card h3{margin-top:0}
.card p:last-child{margin-bottom:0}
.stat{text-align:center;padding:22px 12px}
.stat .num{
  font-size:32px;font-weight:800;
  background:var(--brand-grad);-webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;line-height:1.2
}
.stat .label{font-size:14px;color:var(--ink-soft)}
.list{list-style:none;padding:0;margin:0}
.list li{padding:8px 0 8px 26px;position:relative;color:var(--ink-soft);transition:transform .25s var(--ease),color .25s var(--ease)}
.list li::before{
  content:"✓";position:absolute;left:0;color:var(--brand);font-weight:800
}
.list li:hover{transform:translateX(4px);color:var(--ink)}
.list a{color:var(--ink-soft)}
.list a:hover{color:var(--brand-dark)}

/* 文章 */
.article{
  display:flex;gap:18px;padding:18px;border:1px solid var(--line);
  border-radius:var(--radius);background:var(--glass);
  backdrop-filter:saturate(160%) blur(10px);-webkit-backdrop-filter:saturate(160%) blur(10px);
  margin-bottom:14px;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease)
}
.article:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:transparent}
.article .thumb{flex:0 0 120px;border-radius:var(--radius-sm);overflow:hidden}
.article .thumb svg{transition:transform .5s var(--ease)}
.article:hover .thumb svg{transform:scale(1.06)}
.article h3{margin:0 0 6px;font-size:18px}
.meta{font-size:13px;color:var(--ink-soft);margin-bottom:8px}
.article p{margin:0 0 8px;font-size:15px}
.more{font-weight:700;display:inline-block;transition:transform .28s var(--ease)}
.more:hover{text-decoration:none;transform:translateX(4px)}

/* FAQ */
.faq-item{
  border:1px solid var(--line);border-radius:var(--radius);margin-bottom:10px;
  background:var(--glass);overflow:hidden;
  backdrop-filter:saturate(160%) blur(10px);-webkit-backdrop-filter:saturate(160%) blur(10px);
  transition:box-shadow .3s var(--ease),border-color .3s var(--ease)
}
.faq-item:hover{border-color:var(--brand);box-shadow:var(--shadow)}
.faq-item.open{border-color:var(--brand);box-shadow:var(--shadow)}
.faq-q{
  width:100%;text-align:left;background:transparent;border:0;padding:16px 18px;
  font-size:16px;font-weight:700;color:var(--ink);cursor:pointer;font-family:inherit;
  display:flex;justify-content:space-between;gap:12px;align-items:center;
  transition:color .25s var(--ease)
}
.faq-q:hover{color:var(--brand-dark)}
.faq-q .sign{
  color:#fff;font-weight:800;flex:0 0 24px;height:24px;border-radius:50%;
  background:var(--brand-grad);display:flex;align-items:center;justify-content:center;
  font-size:16px;line-height:1;transition:transform .35s var(--ease)
}
.faq-item.open .faq-q .sign{transform:rotate(180deg)}
.faq-a{
  padding:0 18px 16px;color:var(--ink-soft);display:none;
  animation:faqIn .35s var(--ease) both
}
.faq-a p:last-child{margin-bottom:0}
.faq-item.open .faq-a{display:block}
@keyframes faqIn{
  from{opacity:0;transform:translateY(-6px)}
  to{opacity:1;transform:none}
}

/* HowTo */
.step{display:flex;gap:14px;padding:14px 0;border-bottom:1px dashed var(--line);transition:transform .28s var(--ease)}
.step:hover{transform:translateX(4px)}
.step:last-child{border-bottom:0}
.step .idx{
  flex:0 0 34px;height:34px;border-radius:50%;background:var(--brand-grad);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:800;
  box-shadow:0 6px 16px rgba(255,90,95,.32)
}
.step h4{margin:0 0 4px;color:var(--ink)}
.step p{margin:0}

/* 表格 */
table{
  width:100%;border-collapse:collapse;font-size:15px;
  border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)
}
th,td{border:1px solid var(--line);padding:10px 12px;text-align:left;color:var(--ink-soft)}
th{background:var(--brand-grad-soft);color:var(--ink);font-weight:700}
tbody tr{transition:background .25s var(--ease)}
tbody tr:nth-child(even){background:var(--bg-soft)}
tbody tr:hover{background:var(--brand-soft)}

/* 联系 */
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.contact-item{
  display:flex;gap:12px;padding:16px;border:1px solid var(--line);
  border-radius:var(--radius);background:var(--glass);
  backdrop-filter:saturate(160%) blur(10px);-webkit-backdrop-filter:saturate(160%) blur(10px);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease)
}
.contact-item:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--brand)}
.contact-item svg{flex:0 0 26px;width:26px;height:26px;filter:drop-shadow(0 4px 10px rgba(255,90,95,.3))}
.contact-item b{display:block;color:var(--ink)}

/* 页脚 */
footer{
  background:var(--bg-soft);border-top:1px solid var(--line);
  padding:36px 0 24px;font-size:14px;color:var(--ink-soft);
  position:relative
}
footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:var(--brand-grad);opacity:.85
}
.foot-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.foot-grid h4{color:var(--ink);margin-top:0}
.foot-grid ul{list-style:none;padding:0;margin:0}
.foot-grid li{padding:4px 0;transition:transform .25s var(--ease)}
.foot-grid li:hover{transform:translateX(4px)}
.foot-grid a{color:var(--ink-soft)}
.foot-grid a:hover{color:var(--brand-dark)}
.foot-bottom{
  border-top:1px solid var(--line);margin-top:24px;padding-top:16px;
  display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between
}

/* 返回顶部 */
#backTop{
  position:fixed;right:20px;bottom:24px;z-index:60;display:none;
  width:46px;height:46px;border-radius:50%;border:0;background:var(--brand-grad);color:#fff;
  cursor:pointer;box-shadow:var(--shadow-lg);font-size:20px;
  transition:transform .3s var(--ease),filter .3s var(--ease)
}
#backTop:hover{transform:translateY(-4px) scale(1.06);filter:brightness(1.08)}

/* 滚动动画 */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* 移动端 */
@media (max-width:900px){
  .g4{grid-template-columns:repeat(2,1fr)}
  .g3{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:repeat(2,1fr)}
  .slide-art{display:none}
  .slides{height:300px}
  .nav a{padding:8px 9px;font-size:14px}
}
@media (max-width:640px){
  body{font-size:15px}
  h1{font-size:26px}
  h2{font-size:22px}
  h3{font-size:18px}
  section{padding:34px 0}
  .g2,.g3,.g4,.contact-grid{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr}
  .topbar-inner{gap:10px}
  .nav{
    display:none;position:absolute;top:64px;left:0;right:0;background:var(--glass);
    backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);
    flex-direction:column;padding:10px 16px;border-bottom:1px solid var(--line);
    box-shadow:var(--shadow)
  }
  .nav.open{display:flex}
  .nav a{width:100%;padding:12px 14px}
  .menu-btn{display:flex}
  .search-box input{width:90px}
  .article{flex-direction:column}
  .article .thumb{flex:0 0 auto}
  .slide{padding:24px 20px}
  .slide-text h2{font-size:22px}
  .btn{padding:9px 16px;font-size:14px}
  .stat .num{font-size:26px}
  table{font-size:13px}
  th,td{padding:8px 9px}
  #backTop{right:14px;bottom:18px;width:42px;height:42px}
}
@media (max-width:380px){
  h1{font-size:23px}
  .search-box input{width:70px}
  .search-box button{padding:9px 10px}
}

/* 无障碍与动效偏好 */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important
  }
  .reveal{opacity:1;transform:none}
}
@media print{
  .topbar,#backTop,.dots,.tools{display:none !important}
  body::before{display:none}
  a{color:#000}
}