:root{
  --bg:#f7f9fc;
  --bg-soft:#eef3fb;
  --bg-card:#ffffff;
  --bg-glass:rgba(255,255,255,.66);
  --text:#16202e;
  --text-soft:#5a6678;
  --line:rgba(22,32,46,.1);
  --brand:#1d4ed8;
  --brand-2:#0ea5e9;
  --brand-3:#7c3aed;
  --brand-soft:rgba(29,78,216,.1);
  --accent:#0ea5e9;
  --grad-hero:linear-gradient(135deg,#1d4ed8 0%,#0ea5e9 48%,#7c3aed 100%);
  --grad-btn:linear-gradient(135deg,#1d4ed8,#0ea5e9);
  --grad-line:linear-gradient(90deg,transparent,rgba(29,78,216,.35),transparent);
  --shadow:0 10px 34px rgba(20,35,60,.09);
  --shadow-lg:0 22px 60px rgba(20,35,60,.16);
  --radius:16px;
  --radius-sm:11px;
  --blur:14px;
}

html[data-theme="dark"]{
  --bg:#0a1120;
  --bg-soft:#0f1a2c;
  --bg-card:#131f33;
  --bg-glass:rgba(19,31,51,.6);
  --text:#e9eff8;
  --text-soft:#9db0c8;
  --line:rgba(120,150,190,.18);
  --brand:#5b8cff;
  --brand-2:#38bdf8;
  --brand-3:#a78bfa;
  --brand-soft:rgba(91,140,255,.16);
  --accent:#38bdf8;
  --grad-hero:linear-gradient(135deg,#12234a 0%,#0d2f4a 50%,#2a1a52 100%);
  --grad-btn:linear-gradient(135deg,#3b6cf0,#22b8f0);
  --shadow:0 10px 34px rgba(0,0,0,.45);
  --shadow-lg:0 22px 60px rgba(0,0,0,.55);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.75;
  font-size:16px;
  overflow-x:hidden;
  transition:background .35s ease,color .35s ease;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(60vw 60vw at 85% -10%,rgba(14,165,233,.16),transparent 60%),
    radial-gradient(50vw 50vw at 0% 10%,rgba(124,58,237,.12),transparent 62%),
    radial-gradient(70vw 50vw at 50% 110%,rgba(29,78,216,.1),transparent 65%);
}
img,svg{max-width:100%;display:block}
a{color:var(--brand);text-decoration:none;transition:color .2s}
a:hover{text-decoration:underline}
button{font-family:inherit}
.container{width:min(1180px,92%);margin:0 auto}
.skip-link{
  position:absolute;left:-9999px;top:0;z-index:999;
  background:var(--grad-btn);color:#fff;padding:10px 18px;border-radius:0 0 10px 0;
}
.skip-link:focus{left:0;top:0}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0,0,0,0);white-space:nowrap;border:0;
}

/* ============ Header ============ */
.site-header{
  position:sticky;top:0;z-index:100;
  background:var(--bg-glass);
  -webkit-backdrop-filter:blur(var(--blur)) saturate(160%);
  backdrop-filter:blur(var(--blur)) saturate(160%);
  border-bottom:1px solid var(--line);
  transition:box-shadow .3s ease,background .3s ease;
}
.site-header.scrolled{box-shadow:var(--shadow)}
.header-inner{display:flex;align-items:center;gap:16px;padding:11px 0;position:relative}
.brand{
  display:flex;align-items:center;gap:10px;
  font-weight:800;font-size:19px;color:var(--text);letter-spacing:.2px;
}
.brand:hover{text-decoration:none;color:var(--brand)}
.brand svg{
  width:36px;height:36px;border-radius:11px;
  box-shadow:0 6px 18px rgba(29,78,216,.3);
  transition:transform .35s ease;
}
.brand:hover svg{transform:rotate(-8deg) scale(1.05)}
.brand small{
  display:block;font-size:11px;font-weight:400;
  color:var(--text-soft);letter-spacing:.6px;line-height:1.4;
}
.main-nav{margin-left:auto;display:flex;gap:2px;flex-wrap:wrap}
.main-nav a{
  position:relative;
  padding:8px 11px;border-radius:10px;
  color:var(--text-soft);font-size:14.5px;font-weight:500;
  transition:color .22s,background .22s,transform .22s;
}
.main-nav a::after{
  content:"";position:absolute;left:11px;right:11px;bottom:4px;height:2px;
  border-radius:2px;background:var(--grad-btn);
  transform:scaleX(0);transform-origin:left;
  transition:transform .28s ease;
}
.main-nav a:hover,.main-nav a:focus-visible{
  background:var(--brand-soft);color:var(--brand);text-decoration:none;transform:translateY(-1px);
}
.main-nav a:hover::after,.main-nav a:focus-visible::after{transform:scaleX(1)}
.header-tools{display:flex;align-items:center;gap:8px}
.search-form{
  display:flex;align-items:center;
  background:var(--bg-soft);
  border:1px solid var(--line);
  border-radius:12px;padding:3px 4px 3px 6px;
  transition:border-color .25s,box-shadow .25s;
}
.search-form:focus-within{
  border-color:var(--brand);
  box-shadow:0 0 0 4px var(--brand-soft);
}
.search-form input{
  border:0;background:transparent;color:var(--text);
  padding:6px 8px;width:132px;font-size:14px;outline:none;
}
.search-form input::placeholder{color:var(--text-soft)}
.search-form button{
  border:0;background:var(--grad-btn);color:#fff;
  border-radius:9px;padding:7px 13px;font-size:13px;font-weight:600;cursor:pointer;
  transition:filter .22s,transform .22s;
}
.search-form button:hover{filter:brightness(1.1);transform:translateY(-1px)}
.icon-btn{
  width:40px;height:40px;border-radius:12px;
  border:1px solid var(--line);
  background:var(--bg-soft);color:var(--text);
  cursor:pointer;display:grid;place-items:center;font-size:16px;
  transition:border-color .22s,color .22s,transform .22s,background .22s;
}
.icon-btn:hover{border-color:var(--brand);color:var(--brand);transform:translateY(-2px)}
.menu-toggle{display:none}

@media(max-width:1024px){
  .main-nav{
    display:none;position:absolute;top:100%;left:0;right:0;
    background:var(--bg-glass);
    -webkit-backdrop-filter:blur(var(--blur)) saturate(160%);
    backdrop-filter:blur(var(--blur)) saturate(160%);
    border-bottom:1px solid var(--line);
    padding:12px;flex-direction:column;gap:2px;
    box-shadow:var(--shadow);
    animation:navIn .28s ease both;
  }
  .main-nav.open{display:flex}
  .main-nav a{padding:11px 14px}
  .menu-toggle{display:grid}
  .search-form input{width:104px}
}
@keyframes navIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}
@media(max-width:560px){
  .search-form{display:none}
  .brand small{display:none}
}

/* ============ Hero ============ */
.hero{
  position:relative;overflow:hidden;
  background:var(--grad-hero);
  color:#fff;
  isolation:isolate;
}
.hero::before{
  content:"";position:absolute;inset:0;z-index:-1;
  background:
    radial-gradient(40vw 40vw at 88% 8%,rgba(255,255,255,.22),transparent 62%),
    radial-gradient(34vw 34vw at 6% 92%,rgba(255,255,255,.14),transparent 66%);
  animation:floatGlow 14s ease-in-out infinite alternate;
}
.hero::after{
  content:"";position:absolute;inset:0;z-index:-1;
  background-image:
    linear-gradient(rgba(255,255,255,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px);
  background-size:56px 56px;
  -webkit-mask-image:radial-gradient(70% 70% at 50% 40%,#000,transparent 78%);
  mask-image:radial-gradient(70% 70% at 50% 40%,#000,transparent 78%);
  opacity:.7;
}
@keyframes floatGlow{
  from{transform:translate3d(0,0,0) scale(1)}
  to{transform:translate3d(-2%,2%,0) scale(1.08)}
}
.hero-inner{
  display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center;
  padding:64px 0 60px;
}
@media(max-width:960px){
  .hero-inner{grid-template-columns:1fr;padding:42px 0 44px;gap:30px}
}
.eyebrow{
  display:inline-block;
  background:rgba(255,255,255,.16);
  border:1px solid rgba(255,255,255,.28);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  color:#fff;font-size:13px;font-weight:600;
  padding:6px 14px;border-radius:999px;margin-bottom:18px;
  letter-spacing:.4px;
  animation:fadeUp .7s ease both;
}
.hero h1{
  font-size:clamp(27px,3.5vw,42px);
  line-height:1.28;letter-spacing:-.6px;font-weight:800;
  color:#fff;
  text-shadow:0 2px 24px rgba(4,12,30,.35);
  animation:fadeUp .7s .06s ease both;
}
.hero h1 span{
  background:linear-gradient(100deg,#bae6fd,#e0e7ff 45%,#fbcfe8);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
}
.hero-lead{
  margin-top:18px;color:rgba(255,255,255,.88);
  font-size:16.5px;max-width:58ch;
  animation:fadeUp .7s .12s ease both;
}
.hero-actions{
  margin-top:28px;display:flex;gap:13px;flex-wrap:wrap;
  animation:fadeUp .7s .18s ease both;
}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 24px;border-radius:12px;
  font-weight:700;font-size:15px;
  border:1px solid transparent;cursor:pointer;
  transition:transform .25s ease,box-shadow .25s ease,filter .25s ease,background .25s ease,color .25s ease,border-color .25s ease;
}
.btn-primary{
  background:var(--grad-btn);color:#fff;
  box-shadow:0 10px 26px rgba(14,90,200,.36);
}
.btn-primary:hover{
  filter:brightness(1.08);transform:translateY(-3px);
  box-shadow:0 16px 34px rgba(14,90,200,.44);text-decoration:none;
}
.btn-ghost{
  background:rgba(255,255,255,.1);
  border-color:rgba(255,255,255,.36);
  color:#fff;
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
}
.btn-ghost:hover{
  background:rgba(255,255,255,.2);
  border-color:rgba(255,255,255,.7);
  transform:translateY(-3px);text-decoration:none;
}
.hero-stats{
  display:flex;gap:30px;margin-top:36px;flex-wrap:wrap;
  animation:fadeUp .7s .24s ease both;
}
.stat b{
  font-size:27px;line-height:1.2;display:block;
  background:linear-gradient(100deg,#fff,#bae6fd);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
  font-variant-numeric:tabular-nums;
}
.stat span{font-size:13px;color:rgba(255,255,255,.78)}
@keyframes fadeUp{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}

/* ============ Carousel ============ */
.carousel{
  position:relative;border-radius:var(--radius);overflow:hidden;
  background:rgba(255,255,255,.1);
  border:1px solid rgba(255,255,255,.26);
  -webkit-backdrop-filter:blur(16px) saturate(160%);
  backdrop-filter:blur(16px) saturate(160%);
  box-shadow:0 26px 70px rgba(4,12,30,.4);
  animation:fadeUp .8s .16s ease both;
}
.slides{position:relative;aspect-ratio:16/10}
.slide{
  position:absolute;inset:0;opacity:0;
  transform:scale(1.04);
  transition:opacity .7s ease,transform .7s ease;
  display:grid;place-items:center;
  background:rgba(10,20,40,.35);
}
.slide.active{opacity:1;transform:scale(1)}
.slide svg{width:100%;height:100%}
.slide-caption{
  position:absolute;left:0;right:0;bottom:0;
  padding:18px 20px 16px;
  background:linear-gradient(transparent,rgba(6,14,28,.82));
  color:#fff;font-size:14px;font-weight:500;
  letter-spacing:.2px;
}
.carousel-dots{
  display:flex;gap:8px;justify-content:center;
  padding:12px;background:rgba(8,16,32,.28);
}
.dot{
  width:9px;height:9px;border-radius:6px;border:0;
  background:rgba(255,255,255,.4);cursor:pointer;padding:0;
  transition:width .3s ease,background .3s ease;
}
.dot.active{background:#fff;width:24px}
.dot:hover{background:rgba(255,255,255,.75)}

/* ============ Sections ============ */
section{padding:60px 0;position:relative}
.section-head{max-width:780px;margin-bottom:36px}
.section-head h2{
  font-size:clamp(22px,2.5vw,31px);line-height:1.35;
  letter-spacing:-.4px;font-weight:800;
}
.section-head h2::after{
  content:"";display:block;width:56px;height:4px;border-radius:4px;
  margin-top:14px;background:var(--grad-btn);
}
.section-head p{margin-top:12px;color:var(--text-soft);font-size:15.5px}
.bg-soft{background:var(--bg-soft)}
.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)}
@media(max-width:960px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}

/* ============ Cards ============ */
.card{
  position:relative;
  background:var(--bg-card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:24px;
  overflow:hidden;
  transition:transform .32s cubic-bezier(.22,.68,.35,1),box-shadow .32s ease,border-color .32s ease;
}
.card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:var(--grad-btn);
  transform:scaleX(0);transform-origin:left;
  transition:transform .38s ease;
}
.card:hover{
  transform:translateY(-6px);
  box-shadow:var(--shadow-lg);
  border-color:color-mix(in srgb,var(--brand) 34%,transparent);
}
.card:hover::before{transform:scaleX(1)}
.card h3{font-size:17.5px;margin-bottom:9px;line-height:1.45;letter-spacing:-.2px}
.card p{color:var(--text-soft);font-size:14.8px}
.card .thumb{
  border-radius:12px;overflow:hidden;margin-bottom:16px;
  background:var(--bg-soft);
  transition:transform .4s ease;
}
.card:hover .thumb{transform:scale(1.02)}
.card .thumb svg{width:100%;height:auto;transition:transform .5s ease}
.card:hover .thumb svg{transform:scale(1.05)}
.tag{
  display:inline-block;font-size:12px;font-weight:600;
  padding:4px 11px;border-radius:999px;
  background:var(--brand-soft);color:var(--brand);
  margin-bottom:12px;letter-spacing:.3px;
}
.meta{font-size:12.5px;color:var(--text-soft);margin-top:12px}

/* ============ Reveal ============ */
.reveal{
  opacity:0;transform:translateY(22px);
  transition:opacity .7s cubic-bezier(.22,.68,.35,1),transform .7s cubic-bezier(.22,.68,.35,1);
  will-change:opacity,transform;
}
.reveal.visible{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  .hero::before{animation:none}
  html{scroll-behavior:auto}
}

/* ============ Feature ============ */
.feature{
  display:flex;gap:15px;align-items:flex-start;
  background:var(--bg-card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:20px;
  transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease;
}
.feature:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow);
  border-color:color-mix(in srgb,var(--brand) 30%,transparent);
}
.feature .ico{
  flex:0 0 46px;height:46px;border-radius:13px;
  background:var(--grad-btn);color:#fff;
  display:grid;place-items:center;font-weight:800;font-size:16px;
  box-shadow:0 8px 20px rgba(29,78,216,.28);
  transition:transform .35s ease;
}
.feature:hover .ico{transform:rotate(-6deg) scale(1.06)}
.feature h3{font-size:16.5px;margin-bottom:5px}
.feature p{font-size:14.5px;color:var(--text-soft)}

/* ============ Article list ============ */
.article-list{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
@media(max-width:780px){.article-list{grid-template-columns:1fr}}
.article-item{
  position:relative;
  background:var(--bg-card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:22px;
  overflow:hidden;
  transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease;
}
.article-item::after{
  content:"";position:absolute;left:0;top:0;bottom:0;width:3px;
  background:var(--grad-btn);transform:scaleY(0);transform-origin:top;
  transition:transform .35s ease;
}
.article-item:hover{
  transform:translateY(-4px);box-shadow:var(--shadow);
  border-color:color-mix(in srgb,var(--brand) 28%,transparent);
}
.article-item:hover::after{transform:scaleY(1)}
.article-item h3{font-size:16.5px;margin-bottom:7px;line-height:1.45}
.article-item .summary{font-size:14.5px;color:var(--text-soft)}
.article-item .more{
  display:inline-block;margin-top:13px;font-size:14px;font-weight:700;
  color:var(--brand);
  transition:transform .25s ease,color .25s ease;
}
.article-item:hover .more{transform:translateX(4px)}

/* ============ FAQ ============ */
.faq-item{
  border:1px solid var(--line);
  border-radius:13px;
  background:var(--bg-card);
  margin-bottom:12px;overflow:hidden;
  transition:border-color .28s ease,box-shadow .28s ease;
}
.faq-item:hover{border-color:color-mix(in srgb,var(--brand) 30%,transparent)}
.faq-item:has(.faq-q[aria-expanded="true"]){
  border-color:color-mix(in srgb,var(--brand) 46%,transparent);
  box-shadow:var(--shadow);
}
.faq-q{
  width:100%;text-align:left;background:transparent;border:0;
  padding:17px 20px;font-size:15.5px;font-weight:700;color:var(--text);
  display:flex;justify-content:space-between;align-items:center;gap:14px;
  cursor:pointer;line-height:1.5;
  transition:color .22s,background .22s;
}
.faq-q:hover{color:var(--brand);background:var(--brand-soft)}
.faq-q .plus{
  flex:0 0 auto;
  width:26px;height:26px;border-radius:50%;
  display:grid;place-items:center;
  background:var(--brand-soft);color:var(--brand);
  font-weight:800;font-size:15px;line-height:1;
  transition:transform .32s ease,background .32s ease,color .32s ease;
}
.faq-q[aria-expanded="true"] .plus{
  background:var(--grad-btn);color:#fff;transform:rotate(180deg);
}
.faq-a{max-height:0;overflow:hidden;transition:max-height .38s cubic-bezier(.22,.68,.35,1)}
.faq-a p{padding:0 20px 18px;color:var(--text-soft);font-size:14.8px}

/* ============ HowTo steps ============ */
.steps{counter-reset:step;display:grid;gap:14px}
.step{
  display:flex;gap:16px;
  background:var(--bg-card);
  border:1px solid var(--line);
  border-radius:13px;
  padding:20px;
  transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease;
}
.step:hover{
  transform:translateX(5px);
  box-shadow:var(--shadow);
  border-color:color-mix(in srgb,var(--brand) 30%,transparent);
}
.step .num{
  flex:0 0 40px;height:40px;border-radius:50%;
  background:var(--grad-btn);color:#fff;
  display:grid;place-items:center;font-weight:800;
  box-shadow:0 8px 20px rgba(29,78,216,.3);
  transition:transform .35s ease;
}
.step:hover .num{transform:scale(1.08)}
.step h3{font-size:16px;margin-bottom:5px}
.step p{font-size:14.5px;color:var(--text-soft)}

/* ============ Table ============ */
.table-wrap{
  overflow-x:auto;
  border:1px solid var(--line);
  border-radius:13px;
  background:var(--bg-card);
  box-shadow:var(--shadow);
  -webkit-overflow-scrolling:touch;
}
table{width:100%;border-collapse:collapse;font-size:14.5px;background:transparent;min-width:560px}
th,td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
th{
  background:var(--bg-soft);font-weight:700;color:var(--text);
  font-size:14px;letter-spacing:.3px;white-space:nowrap;
}
tbody tr{transition:background .22s ease}
tbody tr:hover{background:var(--brand-soft)}
tr:last-child td{border-bottom:0}

/* ============ Contact ============ */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
@media(max-width:840px){.contact-grid{grid-template-columns:1fr}}
.contact-info li{
  list-style:none;padding:11px 0;
  border-bottom:1px dashed var(--line);
  font-size:14.8px;color:var(--text-soft);
  transition:color .22s;
}
.contact-info li:last-child{border-bottom:0}
.contact-info li:hover{color:var(--text)}
.contact-info li b{color:var(--text);display:inline-block;min-width:92px;font-weight:700}
.contact-form .field{margin-bottom:15px}
.contact-form label{display:block;font-size:14px;margin-bottom:7px;font-weight:700;color:var(--text)}
.contact-form input,.contact-form textarea{
  width:100%;padding:12px 14px;
  border-radius:11px;border:1px solid var(--line);
  background:var(--bg-soft);color:var(--text);
  font-size:14.5px;font-family:inherit;outline:none;
  transition:border-color .25s,box-shadow .25s,background .25s;
}
.contact-form textarea{resize:vertical;min-height:104px}
.contact-form input::placeholder,.contact-form textarea::placeholder{color:var(--text-soft)}
.contact-form input:focus,.contact-form textarea:focus{
  border-color:var(--brand);
  box-shadow:0 0 0 4px var(--brand-soft);
  background:var(--bg-card);
}

/* ============ Footer ============ */
.site-footer{
  position:relative;
  background:var(--bg-soft);
  border-top:1px solid var(--line);
  padding:52px 0 24px;margin-top:24px;
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:2px;
  background:var(--grad-line);
}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:30px}
@media(max-width:960px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.footer-grid{grid-template-columns:1fr}}
.footer-grid h3{
  font-size:15px;margin-bottom:14px;font-weight:800;
  letter-spacing:.3px;
}
.footer-grid ul{list-style:none}
.footer-grid li{margin-bottom:9px;font-size:14px}
.footer-grid a{
  color:var(--text-soft);
  transition:color .22s,padding-left .22s;
  display:inline-block;
}
.footer-grid a:hover{color:var(--brand);padding-left:4px;text-decoration:none}
.footer-bottom{
  border-top:1px solid var(--line);
  margin-top:34px;padding-top:22px;
  font-size:13px;color:var(--text-soft);
  display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;
  line-height:1.7;
}

/* ============ Back to top ============ */
.to-top{
  position:fixed;right:22px;bottom:26px;z-index:90;
  width:48px;height:48px;border-radius:50%;border:0;
  background:var(--grad-btn);color:#fff;font-size:19px;
  cursor:pointer;box-shadow:0 12px 30px rgba(29,78,216,.4);
  opacity:0;pointer-events:none;
  transform:translateY(12px);
  transition:opacity .3s ease,transform .3s ease,filter .25s ease;
  display:grid;place-items:center;
}
.to-top.show{opacity:1;pointer-events:auto;transform:none}
.to-top:hover{filter:brightness(1.1);transform:translateY(-4px)}
@media(max-width:560px){
  .to-top{right:14px;bottom:18px;width:44px;height:44px}
}

/* ============ Anchor nav ============ */
.anchor-nav{
  display:flex;gap:8px;flex-wrap:wrap;
  padding:16px 0;
  border-bottom:1px solid var(--line);
}
.anchor-nav a{
  font-size:13.5px;font-weight:500;
  padding:7px 14px;border-radius:999px;
  background:var(--bg-card);
  border:1px solid var(--line);
  color:var(--text-soft);
  transition:border-color .22s,color .22s,transform .22s,box-shadow .22s,background .22s;
}
.anchor-nav a:hover{
  border-color:var(--brand);color:var(--brand);
  background:var(--brand-soft);
  transform:translateY(-2px);
  box-shadow:0 6px 16px rgba(29,78,216,.16);
  text-decoration:none;
}

/* ============ Prose ============ */
.prose p{margin-bottom:15px;color:var(--text-soft);font-size:15.5px;line-height:1.85}
.prose h3{
  margin:26px 0 12px;font-size:18.5px;font-weight:800;
  letter-spacing:-.2px;line-height:1.45;
}
.prose h4{margin:18px 0 9px;font-size:16px;font-weight:700}
.prose ul{margin:0 0 16px 20px;color:var(--text-soft);font-size:15px}
.prose li{margin-bottom:7px}
.prose strong{color:var(--text)}
.note{
  position:relative;
  background:var(--brand-soft);
  border-left:4px solid var(--brand);
  border-radius:0 12px 12px 0;
  padding:16px 18px;
  font-size:14.5px;color:var(--text);
  line-height:1.8;
  transition:transform .28s ease,box-shadow .28s ease;
}
.note:hover{transform:translateX(4px);box-shadow:var(--shadow)}

/* ============ Blockquote ============ */
blockquote.card{
  display:flex;flex-direction:column;justify-content:space-between;
  font-style:normal;
}
blockquote.card p{
  font-size:15px;color:var(--text);line-height:1.8;
  position:relative;padding-left:22px;
}
blockquote.card p::before{
  content:"“";
  position:absolute;left:0;top:-8px;
  font-size:38px;line-height:1;font-weight:800;
  color:var(--brand);opacity:.4;
}
blockquote.card footer{margin-top:16px}

/* ============ Focus visible ============ */
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible{
  outline:2px solid var(--brand);
  outline-offset:2px;
  border-radius:6px;
}

/* ============ Selection ============ */
::selection{background:var(--brand);color:#fff}
html[data-theme="dark"] ::selection{background:var(--brand-2);color:#06101f}

/* ============ Scrollbar ============ */
::-webkit-scrollbar{width:11px;height:11px}
::-webkit-scrollbar-track{background:var(--bg-soft)}
::-webkit-scrollbar-thumb{
  background:color-mix(in srgb,var(--brand) 42%,transparent);
  border-radius:8px;border:3px solid var(--bg-soft);
}
::-webkit-scrollbar-thumb:hover{background:var(--brand)}

/* ============ Small screens polish ============ */
@media(max-width:620px){
  body{font-size:15.5px}
  section{padding:44px 0}
  .hero-inner{padding:34px 0 38px}
  .hero-stats{gap:20px}
  .stat b{font-size:23px}
  .card,.article-item,.feature{padding:18px}
  .footer-bottom{font-size:12.5px}
}
@media(max-width:400px){
  .hero-actions .btn{width:100%;justify-content:center}
}
</style>