:root{
  --brand:#E8763A;
  --brand-deep:#C4551F;
  --brand-soft:#FFF1E6;
  --brand-glow:rgba(232,118,58,.32);
  --ink:#2B2118;
  --ink-soft:#5C4F44;
  --line:#EFE3D8;
  --bg:#FFFBF7;
  --card:#FFFFFF;
  --glass:rgba(255,255,255,.62);
  --glass-line:rgba(255,255,255,.55);
  --radius:16px;
  --radius-lg:22px;
  --shadow:0 6px 24px rgba(120,70,30,.08);
  --shadow-hover:0 16px 40px rgba(120,70,30,.16);
  --ease:cubic-bezier(.22,.61,.36,1);
}

html[data-theme="dark"]{
  --brand:#FF9A5C;
  --brand-deep:#FFB27A;
  --brand-soft:#3A2A1E;
  --brand-glow:rgba(255,154,92,.28);
  --ink:#F3E9DF;
  --ink-soft:#C9B8A8;
  --line:#3B2E24;
  --bg:#1A1410;
  --card:#241B15;
  --glass:rgba(36,27,21,.6);
  --glass-line:rgba(255,154,92,.16);
  --shadow:0 6px 24px rgba(0,0,0,.35);
  --shadow-hover:0 16px 40px rgba(0,0,0,.5);
}

*{box-sizing:border-box;margin:0;padding:0}

html{
  scroll-behavior:smooth;
  scroll-padding-top:86px;
  -webkit-text-size-adjust:100%;
}

body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans SC",system-ui,-apple-system,sans-serif;
  background:var(--bg);
  color:var(--ink);
  line-height:1.85;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
  transition:background .4s var(--ease),color .4s var(--ease);
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(680px 420px at 8% -6%,var(--brand-soft),transparent 68%),
    radial-gradient(560px 380px at 96% 4%,rgba(232,118,58,.10),transparent 70%),
    radial-gradient(720px 520px at 50% 108%,rgba(232,118,58,.07),transparent 72%);
}

img,svg{max-width:100%;display:block}

a{
  color:var(--brand-deep);
  text-decoration:none;
  transition:color .25s var(--ease);
}
a:hover{text-decoration:underline}

::selection{background:var(--brand);color:#fff}

:focus-visible{
  outline:3px solid var(--brand);
  outline-offset:2px;
  border-radius:6px;
}

.wrap{width:min(1180px,92%);margin:0 auto}

/* 跳过链接 */
.skip{
  position:absolute;
  left:-9999px;
  top:0;
}
.skip:focus{
  left:12px;
  top:12px;
  z-index:999;
  background:var(--brand);
  color:#fff;
  padding:10px 16px;
  border-radius:10px;
  font-weight:700;
  box-shadow:var(--shadow);
}

/* 顶部提示条 */
.topbar{
  background:linear-gradient(100deg,var(--brand) 0%,var(--brand-deep) 55%,#A8431A 100%);
  color:#fff;
  font-size:13px;
  padding:8px 0;
  letter-spacing:.2px;
  position:relative;
  overflow:hidden;
}
.topbar::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.22),transparent);
  transform:translateX(-100%);
  animation:shine 7s ease-in-out infinite;
}
@keyframes shine{
  0%,70%{transform:translateX(-100%);}
  100%{transform:translateX(100%);}
}
.topbar .wrap{
  display:flex;
  justify-content:space-between;
  gap:12px;
  flex-wrap:wrap;
  position:relative;
  z-index:1;
}

/* 导航 */
header.site{
  position:sticky;
  top:0;
  z-index:100;
  background:var(--glass);
  -webkit-backdrop-filter:blur(16px) saturate(160%);
  backdrop-filter:blur(16px) saturate(160%);
  border-bottom:1px solid var(--line);
  transition:background .4s var(--ease),border-color .4s var(--ease);
}

.nav{
  display:flex;
  align-items:center;
  gap:18px;
  height:68px;
}

.logo{
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:800;
  font-size:19px;
  color:var(--ink);
  white-space:nowrap;
  letter-spacing:.5px;
}
.logo:hover{text-decoration:none;color:var(--brand-deep)}
.logo .mark{
  width:38px;
  height:38px;
  flex:0 0 38px;
  transition:transform .5s var(--ease),filter .4s var(--ease);
  filter:drop-shadow(0 4px 10px var(--brand-glow));
}
.logo:hover .mark{transform:rotate(-12deg) scale(1.08)}

.nav ul{
  display:flex;
  gap:2px;
  list-style:none;
  margin-left:auto;
  flex-wrap:wrap;
}
.nav ul a{
  display:block;
  padding:8px 11px;
  border-radius:10px;
  color:var(--ink-soft);
  font-size:14.5px;
  font-weight:500;
  position:relative;
  transition:background .25s var(--ease),color .25s var(--ease),transform .25s var(--ease);
}
.nav ul a::after{
  content:"";
  position:absolute;
  left:11px;
  right:11px;
  bottom:4px;
  height:2px;
  border-radius:2px;
  background:var(--brand);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .3s var(--ease);
}
.nav ul a:hover{
  background:var(--brand-soft);
  color:var(--brand-deep);
  text-decoration:none;
  transform:translateY(-1px);
}
.nav ul a:hover::after{transform:scaleX(1)}

.nav-tools{
  display:flex;
  align-items:center;
  gap:8px;
}

.search{
  display:flex;
  align-items:center;
  border:1px solid var(--line);
  border-radius:999px;
  padding:4px 5px 4px 14px;
  background:var(--bg);
  transition:border-color .25s var(--ease),box-shadow .25s var(--ease);
}
.search:focus-within{
  border-color:var(--brand);
  box-shadow:0 0 0 4px var(--brand-glow);
}
.search input{
  border:0;
  outline:0;
  background:transparent;
  color:var(--ink);
  width:132px;
  font-size:14px;
  font-family:inherit;
}
.search input::placeholder{color:var(--ink-soft);opacity:.75}
.search button{
  border:0;
  background:var(--brand);
  color:#fff;
  border-radius:999px;
  padding:6px 13px;
  cursor:pointer;
  font-size:13px;
  font-family:inherit;
  font-weight:600;
  transition:background .25s var(--ease),transform .2s var(--ease);
}
.search button:hover{background:var(--brand-deep);transform:scale(1.04)}

.icon-btn{
  border:1px solid var(--line);
  background:var(--card);
  color:var(--ink);
  width:40px;
  height:40px;
  border-radius:11px;
  cursor:pointer;
  font-size:16px;
  display:grid;
  place-items:center;
  transition:transform .25s var(--ease),border-color .25s var(--ease),color .25s var(--ease),box-shadow .25s var(--ease);
}
.icon-btn:hover{
  border-color:var(--brand);
  color:var(--brand-deep);
  transform:translateY(-2px);
  box-shadow:0 8px 18px var(--brand-glow);
}
.icon-btn:active{transform:translateY(0) scale(.96)}

.menu-btn{display:none}

/* 面包屑 */
.crumbs{
  font-size:13px;
  color:var(--ink-soft);
  padding:16px 0 0;
}
.crumbs ol{
  list-style:none;
  display:flex;
  gap:8px;
  flex-wrap:wrap;
}
.crumbs li+li::before{
  content:"›";
  margin-right:8px;
  color:var(--brand);
  font-weight:700;
}
.crumbs a{color:var(--ink-soft)}
.crumbs a:hover{color:var(--brand-deep)}

/* 首屏 */
.hero{
  padding:46px 0 26px;
  position:relative;
}
.hero::before{
  content:"";
  position:absolute;
  inset:0;
  background:radial-gradient(900px 400px at 10% -12%,var(--brand-soft),transparent 72%);
  pointer-events:none;
  z-index:-1;
}
.hero-grid{
  display:grid;
  grid-template-columns:1.15fr .85fr;
  gap:40px;
  align-items:center;
}

.kicker{
  display:inline-flex;
  align-items:center;
  gap:8px;
  background:var(--brand-soft);
  color:var(--brand-deep);
  font-size:13px;
  font-weight:700;
  padding:7px 15px;
  border-radius:999px;
  letter-spacing:.4px;
  border:1px solid var(--glass-line);
  box-shadow:0 4px 14px var(--brand-glow);
}

h1{
  font-size:clamp(26px,3.4vw,40px);
  line-height:1.36;
  margin:18px 0 14px;
  letter-spacing:-.5px;
  font-weight:800;
}
h1 em{
  font-style:normal;
  color:var(--brand-deep);
  background:linear-gradient(transparent 62%,var(--brand-soft) 62%);
  padding:0 2px;
}

.lead{
  font-size:17px;
  color:var(--ink-soft);
  max-width:640px;
}

.hero-actions{
  display:flex;
  gap:12px;
  margin-top:26px;
  flex-wrap:wrap;
}

.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:13px 24px;
  border-radius:12px;
  font-weight:700;
  font-size:15px;
  border:1px solid transparent;
  cursor:pointer;
  font-family:inherit;
  position:relative;
  overflow:hidden;
  transition:transform .28s var(--ease),box-shadow .28s var(--ease),background .28s var(--ease),border-color .28s var(--ease),color .28s var(--ease);
}
.btn::before{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(120deg,transparent 30%,rgba(255,255,255,.35) 50%,transparent 70%);
  transform:translateX(-120%);
  transition:transform .6s var(--ease);
}
.btn:hover::before{transform:translateX(120%)}
.btn:hover{text-decoration:none;transform:translateY(-3px)}

.btn-primary{
  background:linear-gradient(135deg,var(--brand),var(--brand-deep));
  color:#fff;
  box-shadow:0 10px 24px var(--brand-glow);
}
.btn-primary:hover{
  box-shadow:0 16px 34px var(--brand-glow);
}
.btn-ghost{
  background:var(--card);
  color:var(--ink);
  border-color:var(--line);
}
.btn-ghost:hover{
  border-color:var(--brand);
  color:var(--brand-deep);
  box-shadow:var(--shadow-hover);
}

.stats{
  display:flex;
  gap:30px;
  margin-top:32px;
  flex-wrap:wrap;
}
.stat{
  position:relative;
  padding-left:14px;
}
.stat::before{
  content:"";
  position:absolute;
  left:0;
  top:6px;
  bottom:6px;
  width:3px;
  border-radius:3px;
  background:linear-gradient(var(--brand),var(--brand-deep));
  opacity:.7;
}
.stat b{
  display:block;
  font-size:27px;
  color:var(--brand-deep);
  line-height:1.2;
  font-weight:800;
  font-variant-numeric:tabular-nums;
  letter-spacing:-.5px;
}
.stat span{
  font-size:13px;
  color:var(--ink-soft);
}

/* 轮播 */
.slider{
  position:relative;
  border-radius:var(--radius-lg);
  overflow:hidden;
  box-shadow:var(--shadow);
  background:var(--card);
  border:1px solid var(--line);
  transition:box-shadow .4s var(--ease),transform .4s var(--ease);
}
.slider:hover{
  box-shadow:var(--shadow-hover);
  transform:translateY(-3px);
}
.slides{
  position:relative;
  aspect-ratio:4/3;
}
.slide{
  position:absolute;
  inset:0;
  opacity:0;
  transform:scale(1.04);
  transition:opacity .8s var(--ease),transform .8s var(--ease);
  display:grid;
  place-items:center;
  padding:22px;
}
.slide.active{
  opacity:1;
  transform:scale(1);
}
.slide svg{
  width:100%;
  height:100%;
  border-radius:14px;
}
.slide figcaption{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  padding:34px 18px 16px;
  background:linear-gradient(transparent,rgba(20,12,6,.74));
  color:#fff;
  font-size:14px;
  line-height:1.6;
  -webkit-backdrop-filter:blur(2px);
  backdrop-filter:blur(2px);
}
.dots{
  position:absolute;
  right:14px;
  top:14px;
  display:flex;
  gap:6px;
  z-index:2;
}
.dots button{
  width:9px;
  height:9px;
  border-radius:50%;
  border:0;
  background:rgba(255,255,255,.6);
  cursor:pointer;
  padding:0;
  transition:width .35s var(--ease),background .3s var(--ease);
}
.dots button.on{
  background:#fff;
  width:24px;
  border-radius:999px;
}

/* 通用区块 */
section{
  padding:56px 0;
  position:relative;
}

.sec-head{
  max-width:840px;
  margin-bottom:30px;
}
.sec-head .tag{
  display:inline-block;
  font-size:13px;
  font-weight:800;
  color:var(--brand-deep);
  letter-spacing:1.4px;
  position:relative;
  padding-left:16px;
}
.sec-head .tag::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  transform:translateY(-50%);
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--brand);
  box-shadow:0 0 0 4px var(--brand-soft);
}

h2{
  font-size:clamp(22px,2.5vw,30px);
  line-height:1.42;
  margin:10px 0 12px;
  font-weight:800;
  letter-spacing:-.3px;
}
h3{
  font-size:19px;
  margin:24px 0 8px;
  font-weight:700;
  line-height:1.5;
}
h4{
  font-size:16px;
  margin:16px 0 6px;
  color:var(--brand-deep);
  font-weight:700;
}
p{
  margin:11px 0;
  color:var(--ink-soft);
}

.grid{
  display:grid;
  gap:20px;
}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}

/* 卡片 */
.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:24px;
  box-shadow:var(--shadow);
  position:relative;
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease);
}
.card::after{
  content:"";
  position:absolute;
  left:24px;
  right:24px;
  top:0;
  height:2px;
  border-radius:2px;
  background:linear-gradient(90deg,var(--brand),transparent);
  opacity:0;
  transition:opacity .35s var(--ease);
}
.card:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-hover);
  border-color:var(--brand);
}
.card:hover::after{opacity:1}
.card h3{margin-top:0}
.card p{font-size:15px}

.tile{
  display:flex;
  flex-direction:column;
  gap:10px;
}
.tile .ico{
  width:46px;
  height:46px;
  border-radius:13px;
  background:var(--brand-soft);
  display:grid;
  place-items:center;
  transition:transform .4s var(--ease),box-shadow .4s var(--ease);
}
.tile:hover .ico{
  transform:rotate(-8deg) scale(1.08);
  box-shadow:0 8px 18px var(--brand-glow);
}

.soft{
  background:var(--brand-soft);
  border-radius:var(--radius-lg);
  padding:38px;
}

ul.clean{
  list-style:none;
  display:grid;
  gap:10px;
}
ul.clean li{
  padding-left:24px;
  position:relative;
  color:var(--ink-soft);
  font-size:15px;
  transition:color .25s var(--ease);
}
ul.clean li::before{
  content:"";
  position:absolute;
  left:0;
  top:.66em;
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--brand);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease);
}
ul.clean li:hover{color:var(--ink)}
ul.clean li:hover::before{
  transform:scale(1.4);
  box-shadow:0 0 0 4px var(--brand-soft);
}

/* 目录 */
.toc{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(184px,1fr));
  gap:10px;
}
.toc a{
  display:block;
  background:var(--glass);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border:1px solid var(--line);
  border-radius:11px;
  padding:11px 15px;
  font-size:14px;
  color:var(--ink-soft);
  transition:border-color .28s var(--ease),color .28s var(--ease),transform .28s var(--ease),box-shadow .28s var(--ease);
}
.toc a:hover{
  border-color:var(--brand);
  color:var(--brand-deep);
  text-decoration:none;
  transform:translateY(-2px);
  box-shadow:0 8px 18px var(--brand-glow);
}

/* 文章列表 */
.posts{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:20px;
}
.post{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:22px;
  display:flex;
  flex-direction:column;
  gap:8px;
  box-shadow:var(--shadow);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease);
}
.post:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-hover);
  border-color:var(--brand);
}
.post .meta{
  font-size:12.5px;
  color:var(--ink-soft);
  display:flex;
  gap:12px;
  flex-wrap:wrap;
}
.post .meta span{
  position:relative;
  padding-left:10px;
}
.post .meta span::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  transform:translateY(-50%);
  width:4px;
  height:4px;
  border-radius:50%;
  background:var(--brand);
  opacity:.7;
}
.post h3{
  font-size:17px;
  margin:0;
  line-height:1.5;
}
.post p{
  font-size:14.5px;
  margin:0;
}
.post .more{
  margin-top:auto;
  font-size:14px;
  font-weight:700;
  display:inline-flex;
  align-items:center;
  gap:4px;
  transition:gap .28s var(--ease),color .28s var(--ease);
}
.post .more:hover{
  gap:9px;
  text-decoration:none;
}

/* FAQ */
details.faq{
  border:1px solid var(--line);
  border-radius:13px;
  background:var(--card);
  margin-bottom:10px;
  overflow:hidden;
  transition:border-color .3s var(--ease),box-shadow .3s var(--ease);
}
details.faq:hover{
  border-color:var(--brand);
  box-shadow:0 8px 22px var(--brand-glow);
}
details.faq summary{
  cursor:pointer;
  padding:16px 18px;
  font-weight:700;
  font-size:15.5px;
  list-style:none;
  display:flex;
  justify-content:space-between;
  gap:12px;
  align-items:center;
  transition:color .25s var(--ease),background .25s var(--ease);
}
details.faq summary:hover{
  color:var(--brand-deep);
  background:var(--brand-soft);
}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{
  content:"+";
  color:var(--brand);
  font-size:21px;
  font-weight:700;
  line-height:1;
  flex:0 0 auto;
  transition:transform .3s var(--ease);
}
details.faq[open] summary::after{
  content:"–";
  transform:rotate(180deg);
}
details.faq[open]{
  border-color:var(--brand);
}
details.faq .body{
  padding:0 18px 16px;
  font-size:15px;
  animation:fadeDown .4s var(--ease);
}
@keyframes fadeDown{
  from{opacity:0;transform:translateY(-6px);}
  to{opacity:1;transform:none;}
}

/* HowTo */
.steps{
  counter-reset:s;
  display:grid;
  gap:14px;
}
.step{
  display:grid;
  grid-template-columns:44px 1fr;
  gap:14px;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:13px;
  padding:16px;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease);
}
.step:hover{
  transform:translateX(4px);
  box-shadow:var(--shadow-hover);
  border-color:var(--brand);
}
.step::before{
  counter-increment:s;
  content:counter(s);
  width:44px;
  height:44px;
  border-radius:50%;
  background:linear-gradient(135deg,var(--brand),var(--brand-deep));
  color:#fff;
  display:grid;
  place-items:center;
  font-weight:800;
  box-shadow:0 6px 16px var(--brand-glow);
}
.step h4{
  margin:0 0 4px;
  color:var(--ink);
}
.step p{
  margin:0;
  font-size:14.5px;
}

/* 表格 */
.table-wrap{
  overflow-x:auto;
  border:1px solid var(--line);
  border-radius:13px;
  background:var(--card);
  box-shadow:var(--shadow);
  -webkit-overflow-scrolling:touch;
}
table{
  border-collapse:collapse;
  width:100%;
  min-width:560px;
  font-size:14.5px;
}
th,td{
  padding:13px 15px;
  text-align:left;
  border-bottom:1px solid var(--line);
  color:var(--ink-soft);
}
th{
  background:var(--brand-soft);
  color:var(--brand-deep);
  font-weight:700;
  white-space:nowrap;
}
tbody tr{
  transition:background .25s var(--ease);
}
tbody tr:hover{
  background:var(--brand-soft);
}
tr:last-child td{border-bottom:0}

/* 联系 */
.contact-grid{
  display:grid;
  grid-template-columns:1.1fr .9fr;
  gap:24px;
}
.info-list{
  list-style:none;
  display:grid;
  gap:14px;
}
.info-list li{
  display:grid;
  grid-template-columns:96px 1fr;
  gap:10px;
  font-size:15px;
  padding-bottom:12px;
  border-bottom:1px dashed var(--line);
  transition:border-color .25s var(--ease);
}
.info-list li:last-child{border-bottom:0;padding-bottom:0}
.info-list li:hover{border-color:var(--brand)}
.info-list b{
  color:var(--ink);
  font-weight:700;
}

/* 页脚 */
footer.site{
  background:var(--glass);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  border-top:1px solid var(--line);
  padding:46px 0 22px;
  margin-top:20px;
}
.foot-grid{
  display:grid;
  grid-template-columns:1.4fr 1fr 1fr 1fr;
  gap:28px;
}
.foot-grid h4{
  margin:0 0 12px;
  font-size:15px;
  color:var(--ink);
}
.foot-grid ul{
  list-style:none;
  display:grid;
  gap:8px;
  font-size:14px;
}
.foot-grid ul a{
  color:var(--ink-soft);
  display:inline-block;
  transition:color .25s var(--ease),transform .25s var(--ease);
}
.foot-grid ul a:hover{
  color:var(--brand-deep);
  transform:translateX(3px);
  text-decoration:none;
}
.copyright{
  border-top:1px solid var(--line);
  margin-top:32px;
  padding-top:18px;
  font-size:13px;
  color:var(--ink-soft);
  display:flex;
  justify-content:space-between;
  gap:14px;
  flex-wrap:wrap;
}

/* 返回顶部 */
#toTop{
  position:fixed;
  right:20px;
  bottom:24px;
  width:48px;
  height:48px;
  border-radius:50%;
  border:0;
  background:linear-gradient(135deg,var(--brand),var(--brand-deep));
  color:#fff;
  font-size:18px;
  cursor:pointer;
  box-shadow:0 10px 24px var(--brand-glow);
  opacity:0;
  pointer-events:none;
  transform:translateY(14px) scale(.9);
  transition:opacity .35s var(--ease),transform .35s var(--ease),box-shadow .35s var(--ease);
  z-index:90;
}
#toTop.show{
  opacity:1;
  pointer-events:auto;
  transform:translateY(0) scale(1);
}
#toTop:hover{
  box-shadow:0 16px 34px var(--brand-glow);
  transform:translateY(-3px) scale(1.06);
}

/* 滚动动画 */
.reveal{
  opacity:0;
  transform:translateY(22px);
  transition:opacity .8s var(--ease),transform .8s var(--ease);
  will-change:opacity,transform;
}
.reveal.in{
  opacity:1;
  transform:none;
}

/* 响应式 */
@media (max-width:1080px){
  .g4{grid-template-columns:repeat(2,1fr)}
  .nav ul a{padding:8px 9px;font-size:14px}
}

@media (max-width:980px){
  .hero-grid,
  .contact-grid,
  .foot-grid{
    grid-template-columns:1fr;
  }
  .g3{grid-template-columns:repeat(2,1fr)}
  .nav ul{
    display:none;
    position:absolute;
    left:0;
    right:0;
    top:68px;
    background:var(--glass);
    -webkit-backdrop-filter:blur(18px) saturate(160%);
    backdrop-filter:blur(18px) saturate(160%);
    border-bottom:1px solid var(--line);
    flex-direction:column;
    padding:10px 4%;
    gap:2px;
    box-shadow:var(--shadow);
    animation:fadeDown .3s var(--ease);
  }
  .nav ul.open{display:flex}
  .nav ul a{padding:11px 12px;font-size:15px}
  .nav ul a::after{display:none}
  .menu-btn{display:grid}
  .search input{width:100px}
  .slider{max-width:520px;margin:0 auto}
  .hero::before{background:radial-gradient(700px 340px at 50% -10%,var(--brand-soft),transparent 72%)}
}

@media (max-width:680px){
  body{font-size:15.5px}
  .g2,.g3,.g4,.posts{grid-template-columns:1fr}
  section{padding:40px 0}
  .stats{gap:16px;margin-top:26px}
  .stat b{font-size:23px}
  .soft{padding:24px}
  .card{padding:20px}
  .nav{gap:10px;height:62px}
  .logo span{font-size:16px}
  .logo .mark{width:34px;height:34px;flex:0 0 34px}
  .search{display:none}
  h1{font-size:clamp(23px,6vw,30px)}
  .lead{font-size:15.5px}
  .hero-actions{gap:10px}
  .btn{padding:11px 18px;font-size:14.5px;flex:1 1 auto;justify-content:center}
  .info-list li{grid-template-columns:82px 1fr;font-size:14.5px}
  .step{grid-template-columns:38px 1fr;padding:14px}
  .step::before{width:38px;height:38px;font-size:14px}
  .topbar{font-size:12px}
  .topbar .wrap{justify-content:center;text-align:center}
  #toTop{right:14px;bottom:16px;width:44px;height:44px}
  .copyright{flex-direction:column;gap:6px}
}

@media (max-width:400px){
  .wrap{width:94%}
  .stat b{font-size:21px}
  .kicker{font-size:12px;padding:6px 12px}
}

/* 动效降级 */
@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}
}

/* 打印 */
@media print{
  header.site,
  .topbar,
  #toTop,
  .slider,
  .hero-actions{
    display:none !important;
  }
  body{background:#fff;color:#000}
  .card,.post,details.faq{
    box-shadow:none;
    border-color:#ccc;
    break-inside:avoid;
  }
  .reveal{opacity:1;transform:none}
}