:root{
  --bg:#F5F7FA;
  --bg-alt:#FFFFFF;
  --text:#17202A;
  --text-strong:#0E1621;
  --text-soft:#3D4A5C;
  --text-muted:#5A6779;
  --brand:#1F3A5F;
  --brand-strong:#142943;
  --brand-soft:#2E5480;
  --accent:#C2410C;
  --accent-soft:#9A3412;
  --link:#1D4ED8;
  --link-hover:#1E3A8A;
  --border:#D3DAE4;
  --card:#FFFFFF;
  --card-alt:#EEF2F7;
  --nav-bg:rgba(255,255,255,.82);
  --nav-text:#17202A;
  --footer-bg:#0F1B2D;
  --footer-text:#E7ECF3;
  --footer-muted:#B4C0D0;
  --shadow:0 2px 10px rgba(15,27,45,.08);
  --shadow-hover:0 14px 34px rgba(15,27,45,.16);
  --glass:rgba(255,255,255,.62);
  --glass-border:rgba(255,255,255,.55);
  --grad:linear-gradient(135deg,#1F3A5F 0%,#2E5480 45%,#3C6FA6 78%,#C2410C 140%);
  --grad-soft:linear-gradient(135deg,rgba(31,58,95,.10),rgba(194,65,12,.10));
  --radius:16px;
  --radius-sm:10px;
  --radius-pill:999px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

html[data-theme="dark"]{
  --bg:#0B1220;
  --bg-alt:#111C2E;
  --text:#E5E7EB;
  --text-strong:#F8FAFC;
  --text-soft:#CBD5E1;
  --text-muted:#A9B6C7;
  --brand:#7FA8D9;
  --brand-strong:#A9C6E8;
  --brand-soft:#5E8CC0;
  --accent:#F59E6B;
  --accent-soft:#FBBF8A;
  --link:#8AB4F8;
  --link-hover:#BFD6FB;
  --border:#2A3A52;
  --card:#131F33;
  --card-alt:#182741;
  --nav-bg:rgba(15,27,45,.78);
  --nav-text:#E5E7EB;
  --footer-bg:#070E1A;
  --footer-text:#E5E7EB;
  --footer-muted:#A9B6C7;
  --shadow:0 2px 12px rgba(0,0,0,.5);
  --shadow-hover:0 16px 38px rgba(0,0,0,.62);
  --glass:rgba(19,31,51,.55);
  --glass-border:rgba(122,152,190,.28);
  --grad:linear-gradient(135deg,#0F1B2D 0%,#1B3355 45%,#2E5480 80%,#8A3B14 140%);
  --grad-soft:linear-gradient(135deg,rgba(127,168,217,.14),rgba(245,158,107,.14));
}

*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",Arial,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.75;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
  transition:background .35s var(--ease),color .35s var(--ease);
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  background:
    radial-gradient(820px 420px at 8% -6%,rgba(46,84,128,.16),transparent 62%),
    radial-gradient(760px 420px at 96% 4%,rgba(194,65,12,.12),transparent 60%);
  pointer-events:none;
}
html[data-theme="dark"] body::before{
  background:
    radial-gradient(820px 420px at 8% -6%,rgba(94,140,192,.18),transparent 62%),
    radial-gradient(760px 420px at 96% 4%,rgba(245,158,107,.12),transparent 60%);
}
img,svg{max-width:100%;display:block;}
a{color:var(--link);text-decoration:none;transition:color .25s var(--ease);}
a:hover,a:focus{color:var(--link-hover);text-decoration:underline;}
h1,h2,h3,h4{color:var(--text-strong);line-height:1.35;font-weight:700;letter-spacing:.2px;}
h1{font-size:2rem;}
h2{font-size:1.5rem;margin-bottom:.6em;}
h3{font-size:1.2rem;margin-bottom:.5em;}
h4{font-size:1.05rem;margin-bottom:.4em;}
p{color:var(--text);margin-bottom:1em;}
small,.muted{color:var(--text-muted);}
strong{color:var(--text-strong);}
::selection{background:rgba(46,84,128,.28);color:var(--text-strong);}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;}

.container{max-width:1180px;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;}

/* ============ 顶部信息条 ============ */
.topbar{
  background:var(--grad);
  color:#F1F5F9;
  font-size:.85rem;
  padding:7px 0;
  position:relative;
  overflow:hidden;
}
.topbar::after{
  content:"";
  position:absolute;inset:0;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.14),transparent);
  transform:translateX(-100%);
  animation:topbarShine 7s linear infinite;
  pointer-events:none;
}
@keyframes topbarShine{to{transform:translateX(100%);}}
.topbar .container{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;position:relative;z-index:1;}
.topbar a{color:#F1F5F9;text-decoration:underline;text-underline-offset:3px;}
.topbar a:hover{color:#FFFFFF;}

/* ============ 导航（毛玻璃） ============ */
.nav-wrap{
  position:sticky;top:0;z-index:1000;
  background:var(--nav-bg);
  -webkit-backdrop-filter:blur(14px) saturate(160%);
  backdrop-filter:blur(14px) saturate(160%);
  border-bottom:1px solid var(--border);
  box-shadow:var(--shadow);
  transition:background .35s var(--ease),border-color .35s var(--ease);
}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 0;position:relative;}
.brand{display:flex;align-items:center;gap:10px;flex:none;}
.brand-logo{
  width:42px;height:42px;flex:none;border-radius:12px;
  box-shadow:0 6px 16px rgba(31,58,95,.28);
  transition:transform .4s var(--ease),box-shadow .4s var(--ease);
}
.brand:hover .brand-logo{transform:rotate(-6deg) scale(1.06);box-shadow:0 10px 22px rgba(31,58,95,.38);}
.brand-name{font-size:1.2rem;font-weight:800;color:var(--brand-strong);letter-spacing:.5px;display:block;}
.brand-sub{display:block;font-size:.72rem;color:var(--text-muted);font-weight:400;letter-spacing:1px;}
.nav-links{display:flex;flex-wrap:wrap;gap:6px;align-items:center;}
.nav-links a{
  color:var(--nav-text);font-weight:500;font-size:.95rem;
  padding:6px 10px;border-radius:var(--radius-pill);
  position:relative;
  transition:color .25s var(--ease),background .25s var(--ease),transform .25s var(--ease);
}
.nav-links a::after{
  content:"";position:absolute;left:50%;bottom:2px;height:2px;width:0;
  background:var(--accent);border-radius:2px;
  transform:translateX(-50%);
  transition:width .3s var(--ease);
}
.nav-links a:hover,.nav-links a:focus{
  color:var(--brand-strong);background:var(--grad-soft);text-decoration:none;transform:translateY(-1px);
}
.nav-links a:hover::after,.nav-links a:focus::after{width:60%;}
.nav-tools{display:flex;align-items:center;gap:10px;}
.search-box{
  display:flex;align-items:center;
  border:1px solid var(--border);
  border-radius:var(--radius-pill);
  overflow:hidden;background:var(--card);
  transition:border-color .25s var(--ease),box-shadow .25s var(--ease);
}
.search-box:focus-within{border-color:var(--brand);box-shadow:0 0 0 3px rgba(46,84,128,.16);}
.search-box input{
  border:0;outline:0;padding:7px 14px;font-size:.9rem;width:158px;
  background:transparent;color:var(--text);font-family:inherit;
}
.search-box input::placeholder{color:var(--text-muted);}
.search-box button{
  border:0;background:var(--brand);color:#FFFFFF;padding:7px 16px;
  cursor:pointer;font-size:.9rem;font-family:inherit;
  transition:background .25s var(--ease);
}
.search-box button:hover{background:var(--brand-strong);}
.theme-btn{
  border:1px solid var(--border);background:var(--card);color:var(--text);
  border-radius:var(--radius-pill);padding:7px 14px;cursor:pointer;font-size:.85rem;
  font-family:inherit;
  transition:border-color .25s var(--ease),color .25s var(--ease),background .25s var(--ease),transform .25s var(--ease);
}
.theme-btn:hover{border-color:var(--brand);color:var(--brand-strong);background:var(--card-alt);transform:translateY(-1px);}
.menu-toggle{
  display:none;border:1px solid var(--border);background:var(--card);color:var(--text);
  border-radius:var(--radius-sm);padding:7px 13px;cursor:pointer;font-size:1rem;
  transition:border-color .25s var(--ease),color .25s var(--ease);
}
.menu-toggle:hover{border-color:var(--brand);color:var(--brand-strong);}

/* ============ Banner 渐变轮播 ============ */
.banner{
  position:relative;overflow:hidden;color:#FFFFFF;
  background:var(--grad);
  isolation:isolate;
}
.banner::before,
.banner::after{
  content:"";position:absolute;border-radius:50%;pointer-events:none;
  filter:blur(60px);opacity:.55;z-index:0;
}
.banner::before{
  width:420px;height:420px;top:-160px;right:-80px;
  background:radial-gradient(circle,rgba(255,255,255,.42),transparent 68%);
  animation:floatBlob 14s ease-in-out infinite;
}
.banner::after{
  width:380px;height:380px;bottom:-180px;left:-90px;
  background:radial-gradient(circle,rgba(194,65,12,.55),transparent 68%);
  animation:floatBlob 18s ease-in-out infinite reverse;
}
@keyframes floatBlob{
  0%,100%{transform:translate3d(0,0,0) scale(1);}
  50%{transform:translate3d(-26px,22px,0) scale(1.12);}
}
.banner .container{position:relative;z-index:1;}
.banner-slide{display:none;padding:60px 0 56px;}
.banner-slide.active{display:block;animation:slideIn .7s var(--ease) both;}
@keyframes slideIn{
  from{opacity:0;transform:translateY(22px);}
  to{opacity:1;transform:none;}
}
.banner h1{color:#FFFFFF;font-size:2.15rem;margin-bottom:14px;text-shadow:0 2px 10px rgba(0,0,0,.32);}
.banner h2{color:#FFFFFF;font-size:1.8rem;margin-bottom:14px;text-shadow:0 2px 10px rgba(0,0,0,.32);}
.banner p{color:#F1F5F9;font-size:1.05rem;max-width:840px;text-shadow:0 1px 6px rgba(0,0,0,.3);}
.banner-tag{
  display:inline-block;
  background:rgba(255,255,255,.16);
  border:1px solid rgba(255,255,255,.42);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  color:#FFFFFF;border-radius:var(--radius-pill);
  padding:5px 16px;font-size:.85rem;margin-bottom:16px;letter-spacing:.4px;
}
.banner-actions{margin-top:24px;display:flex;flex-wrap:wrap;gap:12px;}
.btn{
  display:inline-block;padding:11px 24px;border-radius:var(--radius-sm);
  font-weight:600;font-size:.95rem;cursor:pointer;border:1px solid transparent;
  font-family:inherit;
  transition:transform .28s var(--ease),box-shadow .28s var(--ease),background .28s var(--ease),color .28s var(--ease),border-color .28s var(--ease);
}
.btn:hover{text-decoration:none;transform:translateY(-2px);}
.btn-primary{
  background:#FFFFFF;color:#142943;
  box-shadow:0 8px 22px rgba(0,0,0,.24);
}
.btn-primary:hover{background:#E7ECF3;color:#0E1621;box-shadow:0 12px 28px rgba(0,0,0,.32);}
.btn-outline{
  background:rgba(255,255,255,.08);color:#FFFFFF;
  border-color:rgba(255,255,255,.7);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
}
.btn-outline:hover{background:rgba(255,255,255,.2);color:#FFFFFF;box-shadow:0 10px 26px rgba(0,0,0,.26);}
.banner-dots{
  position:absolute;bottom:18px;left:50%;transform:translateX(-50%);
  display:flex;gap:9px;z-index:2;
}
.banner-dots button{
  width:11px;height:11px;border-radius:50%;border:0;
  background:rgba(255,255,255,.45);cursor:pointer;padding:0;
  transition:background .3s var(--ease),transform .3s var(--ease),width .3s var(--ease);
}
.banner-dots button:hover{background:rgba(255,255,255,.8);transform:scale(1.15);}
.banner-dots button.active{background:#FFFFFF;width:26px;border-radius:var(--radius-pill);}

/* ============ 面包屑 ============ */
.breadcrumb{font-size:.85rem;color:var(--text-muted);padding:16px 0;}
.breadcrumb a{color:var(--link);}
.breadcrumb span{color:var(--text-muted);}

/* ============ 通用区块 ============ */
section{padding:52px 0;position:relative;}
.section-head{margin-bottom:28px;}
.section-head h2{position:relative;padding-left:16px;}
.section-head h2::before{
  content:"";position:absolute;left:0;top:6px;bottom:6px;width:5px;border-radius:3px;
  background:var(--grad);
  box-shadow:0 0 0 3px var(--grad-soft);
}
.section-head .lead{color:var(--text-soft);max-width:900px;margin-top:8px;}

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

/* ============ 卡片（圆角 + 毛玻璃 + hover） ============ */
.card,.article-item,.stat{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  position:relative;
  overflow:hidden;
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease),background .35s var(--ease);
}
.card{padding:24px;}
.card::before,.article-item::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:var(--grad);
  transform:scaleX(0);transform-origin:left;
  transition:transform .45s var(--ease);
}
.card:hover,.article-item:hover,.stat:hover{
  transform:translateY(-6px);
  box-shadow:var(--shadow-hover);
  border-color:var(--brand-soft);
}
.card:hover::before,.article-item:hover::before{transform:scaleX(1);}
.card h3{color:var(--brand-strong);}
.card p{color:var(--text);font-size:.95rem;}
.card .meta{font-size:.82rem;color:var(--text-muted);}
.card h4{margin-top:14px;color:var(--brand-strong);}

.tag{
  display:inline-block;
  background:var(--grad-soft);
  color:var(--brand-strong);
  border:1px solid var(--border);
  border-radius:var(--radius-pill);
  padding:3px 12px;font-size:.78rem;margin:0 6px 6px 0;
  transition:transform .25s var(--ease),border-color .25s var(--ease),color .25s var(--ease);
}
.tag:hover{transform:translateY(-2px);border-color:var(--brand-soft);color:var(--accent);}

.stat{text-align:center;padding:26px 14px;background:var(--card);}
.stat::after{
  content:"";position:absolute;inset:auto -30% -60% -30%;height:120px;
  background:radial-gradient(ellipse at center,var(--grad-soft),transparent 70%);
  opacity:0;transition:opacity .4s var(--ease);
}
.stat:hover::after{opacity:1;}
.stat .num{font-size:2.1rem;font-weight:800;color:var(--brand-strong);line-height:1.2;}
.stat .label{color:var(--text-soft);font-size:.9rem;}

/* ============ 列表 ============ */
ul.clean{list-style:none;}
ul.clean li{
  padding:9px 0 9px 24px;position:relative;color:var(--text);
  border-bottom:1px dashed var(--border);
  transition:padding-left .28s var(--ease),color .28s var(--ease);
}
ul.clean li:last-child{border-bottom:0;}
ul.clean li::before{
  content:"";position:absolute;left:4px;top:18px;width:8px;height:8px;border-radius:50%;
  background:var(--grad);
  transition:transform .28s var(--ease);
}
ul.clean li:hover{padding-left:30px;color:var(--text-strong);}
ul.clean li:hover::before{transform:scale(1.35);}
ul.clean li a{color:var(--link);}

ol.steps{list-style:none;counter-reset:step;}
ol.steps li{
  counter-increment:step;position:relative;
  padding:13px 0 13px 48px;border-bottom:1px solid var(--border);
  color:var(--text);
  transition:padding-left .28s var(--ease),color .28s var(--ease);
}
ol.steps li:last-child{border-bottom:0;}
ol.steps li::before{
  content:counter(step);
  position:absolute;left:0;top:13px;width:32px;height:32px;border-radius:50%;
  background:var(--grad);color:#FFFFFF;
  display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:.9rem;
  box-shadow:0 6px 16px rgba(31,58,95,.28);
  transition:transform .3s var(--ease);
}
ol.steps li:hover{padding-left:54px;color:var(--text-strong);}
ol.steps li:hover::before{transform:scale(1.1) rotate(-6deg);}

/* ============ 文章列表 ============ */
.article-item{
  display:flex;flex-direction:column;gap:8px;
  padding:22px;
}
.article-item h3{font-size:1.08rem;}
.article-item .meta{font-size:.82rem;color:var(--text-muted);}
.article-item .excerpt{color:var(--text-soft);font-size:.93rem;}
.read-more{
  color:var(--link);font-weight:600;font-size:.9rem;
  display:inline-flex;align-items:center;gap:6px;
  transition:gap .28s var(--ease),color .28s var(--ease);
}
.read-more:hover{color:var(--link-hover);gap:11px;}

/* ============ FAQ ============ */
.faq-item{
  border:1px solid var(--border);border-radius:var(--radius);
  margin-bottom:12px;background:var(--card);overflow:hidden;
  box-shadow:var(--shadow);
  transition:box-shadow .3s var(--ease),border-color .3s var(--ease),transform .3s var(--ease);
}
.faq-item:hover{box-shadow:var(--shadow-hover);border-color:var(--brand-soft);}
.faq-item.open{border-color:var(--brand-soft);}
.faq-q{
  width:100%;text-align:left;background:transparent;border:0;
  padding:17px 20px;font-size:1rem;font-weight:600;color:var(--text-strong);
  cursor:pointer;display:flex;justify-content:space-between;gap:12px;align-items:center;
  font-family:inherit;
  transition:background .25s var(--ease);
}
.faq-q:hover{background:var(--card-alt);}
.faq-q .icon{
  color:var(--brand-strong);font-weight:800;font-size:1.15rem;flex:none;
  width:26px;height:26px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:var(--grad-soft);
  transition:transform .35s var(--ease),background .35s var(--ease);
}
.faq-item.open .faq-q .icon{transform:rotate(180deg);}
.faq-a{
  display:none;padding:0 20px 20px;color:var(--text);
  border-top:1px solid var(--border);
  animation:fadeDown .38s var(--ease) both;
}
.faq-item.open .faq-a{display:block;}
@keyframes fadeDown{
  from{opacity:0;transform:translateY(-8px);}
  to{opacity:1;transform:none;}
}
.faq-a p{margin-top:14px;}

/* ============ 表格 ============ */
table{
  width:100%;border-collapse:collapse;
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);overflow:hidden;font-size:.93rem;
}
th,td{padding:13px 15px;text-align:left;border-bottom:1px solid var(--border);color:var(--text);}
th{background:var(--card-alt);color:var(--text-strong);font-weight:700;}
tbody tr{transition:background .25s var(--ease);}
tbody tr:hover{background:var(--grad-soft);}
tbody tr:last-child td{border-bottom:0;}

/* ============ 表单 ============ */
.form-row{margin-bottom:15px;}
.form-row label{display:block;font-weight:600;color:var(--text-strong);margin-bottom:7px;font-size:.92rem;}
.form-row input,.form-row textarea{
  width:100%;padding:11px 13px;
  border:1px solid var(--border);border-radius:var(--radius-sm);
  background:var(--bg-alt);color:var(--text);font-size:.95rem;font-family:inherit;
  transition:border-color .25s var(--ease),box-shadow .25s var(--ease),background .25s var(--ease);
}
.form-row input::placeholder,.form-row textarea::placeholder{color:var(--text-muted);}
.form-row input:focus,.form-row textarea:focus{
  outline:0;border-color:var(--brand);
  box-shadow:0 0 0 3px rgba(46,84,128,.16);
}
.form-row textarea{resize:vertical;min-height:110px;}
.form-hint{font-size:.82rem;color:var(--text-muted);}

/* ============ 联系信息 ============ */
.contact-list{list-style:none;}
.contact-list li{
  padding:11px 0;border-bottom:1px dashed var(--border);color:var(--text);
  transition:padding-left .28s var(--ease),color .28s var(--ease);
}
.contact-list li:last-child{border-bottom:0;}
.contact-list li:hover{padding-left:8px;color:var(--text-strong);}
.contact-list strong{color:var(--text-strong);}

/* ============ 页脚 ============ */
footer{
  background:var(--footer-bg);color:var(--footer-text);
  padding:48px 0 22px;margin-top:24px;position:relative;overflow:hidden;
}
footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--grad);
}
footer h3,footer h4{color:#FFFFFF;}
footer p,footer li,footer a{color:var(--footer-text);}
footer a:hover{color:#FFFFFF;text-decoration:underline;}
footer .footer-muted{color:var(--footer-muted);}
footer ul.clean li{border-bottom:0;padding:6px 0 6px 20px;}
footer ul.clean li::before{top:15px;background:var(--accent);}
footer ul.clean li:hover{padding-left:24px;color:#FFFFFF;}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.4fr;gap:28px;}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.18);
  margin-top:28px;padding-top:18px;font-size:.85rem;color:var(--footer-muted);
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;
}
.footer-bottom a{color:var(--footer-muted);}
.footer-bottom a:hover{color:#FFFFFF;}

/* ============ 返回顶部 ============ */
.to-top{
  position:fixed;right:22px;bottom:26px;
  width:48px;height:48px;border-radius:50%;
  background:var(--grad);color:#FFFFFF;border:0;cursor:pointer;
  font-size:1.2rem;
  box-shadow:0 6px 20px rgba(0,0,0,.3);
  display:none;z-index:1200;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),opacity .3s var(--ease);
}
.to-top.show{display:block;animation:fadeUp .35s var(--ease) both;}
.to-top:hover{transform:translateY(-4px) scale(1.06);box-shadow:0 12px 28px rgba(0,0,0,.4);}
@keyframes fadeUp{
  from{opacity:0;transform:translateY(14px);}
  to{opacity:1;transform:none;}
}

/* ============ 滚动动画 ============ */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s var(--ease),transform .7s var(--ease);}
.reveal.visible{opacity:1;transform:none;}

/* ============ 响应式 ============ */
@media (max-width:1024px){
  .footer-grid{grid-template-columns:1fr 1fr;}
  .search-box input{width:130px;}
}
@media (max-width:960px){
  .grid-4{grid-template-columns:repeat(2,1fr);}
  .grid-3{grid-template-columns:repeat(2,1fr);}
  .banner h1{font-size:1.85rem;}
  .banner h2{font-size:1.6rem;}
  .footer-grid{grid-template-columns:1fr 1fr;}
}
@media (max-width:720px){
  body{font-size:15.5px;}
  .menu-toggle{display:inline-block;}
  .nav-links{
    display:none;
    position:absolute;left:0;right:0;top:100%;
    background:var(--nav-bg);
    -webkit-backdrop-filter:blur(16px) saturate(160%);
    backdrop-filter:blur(16px) saturate(160%);
    border-bottom:1px solid var(--border);
    flex-direction:column;align-items:stretch;
    padding:14px 20px;gap:6px;
    box-shadow:var(--shadow-hover);
  }
  .nav-links.open{display:flex;animation:fadeDown .3s var(--ease) both;}
  .nav-links a{padding:10px 12px;}
  .nav-links a::after{display:none;}
  .nav-tools{gap:8px;}
  .search-box input{width:100px;padding:7px 10px;}
  .search-box button{padding:7px 12px;}
  .theme-btn{padding:7px 11px;font-size:.8rem;}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr;}
  h1{font-size:1.6rem;}
  h2{font-size:1.3rem;}
  .banner h1{font-size:1.5rem;}
  .banner h2{font-size:1.35rem;}
  .banner-slide{padding:44px 0 52px;}
  .banner p{font-size:.98rem;}
  section{padding:40px 0;}
  .card{padding:20px;}
  .to-top{right:16px;bottom:18px;width:44px;height:44px;}
  table{font-size:.86rem;}
  th,td{padding:10px 11px;}
  .footer-bottom{flex-direction:column;}
}
@media (max-width:420px){
  .topbar .container{flex-direction:column;align-items:flex-start;gap:4px;}
  .search-box input{width:82px;}
  .brand-sub{display:none;}
}

/* ============ 减少动效偏好 ============ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .reveal{opacity:1;transform:none;}
  .banner::before,.banner::after{animation:none;}
  .topbar::after{animation:none;}
}

/* ============ 打印 ============ */
@media print{
  .nav-wrap,.topbar,.banner-dots,.to-top,.theme-btn,.menu-toggle,.search-box{display:none !important;}
  body{background:#fff;color:#000;}
  .card,.article-item,.faq-item{box-shadow:none;border-color:#ccc;}
  a{color:#000;text-decoration:underline;}
}