:root{
  --bg:#f5f7fb;
  --bg-soft:#eef2f9;
  --fg:#141c28;
  --fg-soft:#2a3646;
  --muted:#5b6b7d;
  --brand:#2f6bff;
  --brand-2:#7a4dff;
  --brand-3:#00c2c7;
  --accent:#ff7a3d;
  --card:#ffffff;
  --card-2:#fbfcfe;
  --line:#e2e9f3;
  --line-strong:#cfdaea;
  --shadow-sm:0 2px 10px rgba(18,38,74,.06);
  --shadow-md:0 10px 30px rgba(18,38,74,.10);
  --shadow-lg:0 22px 60px rgba(18,38,74,.16);
  --glass:rgba(255,255,255,.62);
  --glass-line:rgba(255,255,255,.55);
  --radius-sm:10px;
  --radius:16px;
  --radius-lg:22px;
  --radius-pill:999px;
  --hero-grad:linear-gradient(135deg,#0b1a2b 0%,#1c2f52 48%,#2f6bff 100%);
  --brand-grad:linear-gradient(135deg,var(--brand),var(--brand-2));
  --ring:0 0 0 3px rgba(47,107,255,.22);
  --ease:cubic-bezier(.22,.61,.36,1);
}

body.dark{
  --bg:#0c141d;
  --bg-soft:#101a25;
  --fg:#e8eff8;
  --fg-soft:#d2ddec;
  --muted:#9bafc4;
  --brand:#5b8cff;
  --brand-2:#a07bff;
  --brand-3:#2fe0e4;
  --accent:#ff9a63;
  --card:#141f2b;
  --card-2:#18242f;
  --line:#25364a;
  --line-strong:#31465e;
  --shadow-sm:0 2px 10px rgba(0,0,0,.35);
  --shadow-md:0 10px 30px rgba(0,0,0,.45);
  --shadow-lg:0 22px 60px rgba(0,0,0,.55);
  --glass:rgba(22,34,47,.62);
  --glass-line:rgba(120,150,190,.22);
  --hero-grad:linear-gradient(135deg,#050c14 0%,#0f1c2e 48%,#1f4bb8 100%);
  --ring:0 0 0 3px rgba(91,140,255,.28);
}

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

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
  scroll-padding-top:84px;
}

body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  background:var(--bg);
  color:var(--fg);
  line-height:1.8;
  font-size:16px;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  transition:background .35s var(--ease),color .35s var(--ease);
  overflow-x:hidden;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(760px 420px at 8% -6%,rgba(47,107,255,.10),transparent 62%),
    radial-gradient(680px 400px at 96% 4%,rgba(122,77,255,.10),transparent 60%),
    radial-gradient(620px 380px at 50% 108%,rgba(0,194,199,.08),transparent 62%);
}

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

a{
  color:var(--brand);
  text-decoration:none;
  transition:color .25s var(--ease),opacity .25s var(--ease);
}
a:hover{color:var(--brand-2);text-decoration:none}

p{color:var(--muted)}
h1,h2,h3,h4,h5,h6{color:var(--fg);line-height:1.35;font-weight:800;letter-spacing:.01em}

::selection{background:rgba(47,107,255,.22);color:var(--fg)}

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

.wrap{
  width:100%;
  max-width:1180px;
  margin:0 auto;
  padding:0 20px;
}

/* ============ Header ============ */
header.site{
  position:sticky;
  top:0;
  z-index:100;
  background:var(--glass);
  -webkit-backdrop-filter:saturate(180%) blur(16px);
  backdrop-filter:saturate(180%) blur(16px);
  border-bottom:1px solid var(--line);
  box-shadow:var(--shadow-sm);
  transition:background .35s var(--ease),border-color .35s var(--ease),box-shadow .35s var(--ease);
}

.nav{
  display:flex;
  align-items:center;
  gap:24px;
  height:68px;
}

.logo{
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:800;
  font-size:20px;
  color:var(--fg);
  letter-spacing:.02em;
  white-space:nowrap;
  transition:transform .3s var(--ease);
}
.logo:hover{transform:translateY(-1px)}
.logo span.dot{
  width:12px;
  height:12px;
  border-radius:50%;
  background:var(--brand-grad);
  box-shadow:0 0 0 4px rgba(47,107,255,.14),0 0 18px rgba(122,77,255,.55);
  animation:pulseDot 2.8s ease-in-out infinite;
}
@keyframes pulseDot{
  0%,100%{box-shadow:0 0 0 4px rgba(47,107,255,.14),0 0 18px rgba(122,77,255,.55)}
  50%{box-shadow:0 0 0 7px rgba(47,107,255,.08),0 0 26px rgba(122,77,255,.75)}
}

.nav ul{
  display:flex;
  align-items:center;
  gap:6px;
  list-style:none;
  flex:1;
  min-width:0;
}

.nav ul a{
  display:inline-block;
  position:relative;
  color:var(--fg-soft);
  font-size:15px;
  padding:6px 10px;
  border-radius:var(--radius-pill);
  transition:color .25s var(--ease),background .25s var(--ease),transform .25s var(--ease);
}
.nav ul a::after{
  content:"";
  position:absolute;
  left:50%;
  bottom:2px;
  width:0;
  height:2px;
  border-radius:2px;
  background:var(--brand-grad);
  transform:translateX(-50%);
  transition:width .3s var(--ease);
}
.nav ul a:hover{
  color:var(--brand);
  background:rgba(47,107,255,.08);
  transform:translateY(-1px);
}
.nav ul a:hover::after{width:56%}

.nav-tools{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}

.search-box{
  display:flex;
  align-items:center;
  gap:4px;
  border:1px solid var(--line);
  border-radius:var(--radius-pill);
  padding:4px 6px 4px 14px;
  background:var(--bg-soft);
  transition:border-color .25s var(--ease),box-shadow .25s var(--ease),background .25s var(--ease);
}
.search-box:focus-within{
  border-color:var(--brand);
  background:var(--card);
  box-shadow:var(--ring);
}
.search-box input{
  border:0;
  background:transparent;
  outline:none;
  color:var(--fg);
  width:132px;
  font-size:14px;
  font-family:inherit;
}
.search-box input::placeholder{color:var(--muted);opacity:.85}
.search-box button{
  border:0;
  background:transparent;
  cursor:pointer;
  color:var(--brand);
  font-size:14px;
  font-family:inherit;
  padding:2px 8px;
  border-radius:var(--radius-pill);
  transition:background .25s var(--ease),color .25s var(--ease);
}
.search-box button:hover{background:rgba(47,107,255,.12);color:var(--brand-2)}

.btn{
  border:1px solid var(--line);
  background:var(--card);
  color:var(--fg);
  border-radius:var(--radius-pill);
  padding:6px 14px;
  cursor:pointer;
  font-size:14px;
  font-family:inherit;
  line-height:1.5;
  transition:border-color .25s var(--ease),color .25s var(--ease),transform .25s var(--ease),box-shadow .25s var(--ease),background .25s var(--ease);
}
.btn:hover{
  border-color:var(--brand);
  color:var(--brand);
  transform:translateY(-1px);
  box-shadow:var(--shadow-sm);
}
.btn:active{transform:translateY(0)}

.menu-toggle{
  display:none;
  border:0;
  background:transparent;
  font-size:22px;
  cursor:pointer;
  color:var(--fg);
  padding:4px 8px;
  border-radius:var(--radius-sm);
  transition:background .25s var(--ease);
}
.menu-toggle:hover{background:rgba(47,107,255,.1)}

/* ============ Hero ============ */
.hero{
  position:relative;
  overflow:hidden;
  background:var(--hero-grad);
  color:#fff;
  padding:64px 0 52px;
  isolation:isolate;
}
.hero::before{
  content:"";
  position:absolute;
  inset:-30% -10% auto -10%;
  height:140%;
  z-index:-1;
  background:
    radial-gradient(520px 320px at 18% 22%,rgba(122,77,255,.42),transparent 64%),
    radial-gradient(560px 340px at 82% 8%,rgba(0,194,199,.30),transparent 62%),
    radial-gradient(420px 260px at 62% 92%,rgba(255,122,61,.24),transparent 66%);
  filter:blur(6px);
  animation:heroFloat 16s ease-in-out infinite alternate;
}
.hero::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:
    radial-gradient(rgba(255,255,255,.55) 1px,transparent 1px),
    radial-gradient(rgba(255,255,255,.32) 1px,transparent 1px);
  background-size:120px 120px,180px 180px;
  background-position:0 0,60px 70px;
  opacity:.35;
  mask-image:linear-gradient(to bottom,rgba(0,0,0,.75),transparent 85%);
  -webkit-mask-image:linear-gradient(to bottom,rgba(0,0,0,.75),transparent 85%);
}
@keyframes heroFloat{
  from{transform:translate3d(-2%,-1%,0) scale(1)}
  to{transform:translate3d(2%,2%,0) scale(1.06)}
}

.hero .wrap{
  display:grid;
  grid-template-columns:1.2fr .8fr;
  gap:36px;
  align-items:center;
  position:relative;
}

.hero h1{
  font-size:clamp(24px,3.1vw,36px);
  line-height:1.32;
  margin-bottom:16px;
  font-weight:800;
  color:#fff;
  text-shadow:0 2px 24px rgba(0,0,0,.28);
  letter-spacing:.01em;
}
.hero p{
  color:#d5e2f5;
  font-size:16px;
  margin-bottom:22px;
  max-width:60ch;
}
.hero .cta{
  display:flex;
  gap:12px;
  flex-wrap:wrap;
}
.hero .cta a{
  padding:11px 24px;
  border-radius:var(--radius-pill);
  font-weight:700;
  font-size:15px;
  transition:transform .28s var(--ease),box-shadow .28s var(--ease),background .28s var(--ease),color .28s var(--ease),border-color .28s var(--ease);
  will-change:transform;
}
.hero .cta a.primary{
  background:#fff;
  color:#1c2f52;
  box-shadow:0 10px 26px rgba(0,0,0,.24);
}
.hero .cta a.primary:hover{
  transform:translateY(-3px);
  box-shadow:0 16px 34px rgba(0,0,0,.32);
  background:#f2f7ff;
  color:#12305f;
}
.hero .cta a.ghost{
  border:1px solid rgba(255,255,255,.6);
  color:#fff;
  background:rgba(255,255,255,.06);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
}
.hero .cta a.ghost:hover{
  transform:translateY(-3px);
  border-color:#fff;
  background:rgba(255,255,255,.16);
  box-shadow:0 12px 28px rgba(0,0,0,.22);
}

/* Slider */
.slider{
  position:relative;
  border-radius:var(--radius-lg);
  overflow:hidden;
  background:rgba(255,255,255,.10);
  border:1px solid rgba(255,255,255,.20);
  -webkit-backdrop-filter:blur(18px) saturate(160%);
  backdrop-filter:blur(18px) saturate(160%);
  padding:24px;
  box-shadow:0 24px 60px rgba(0,0,0,.28),inset 0 1px 0 rgba(255,255,255,.24);
  transition:transform .4s var(--ease),box-shadow .4s var(--ease);
}
.slider:hover{
  transform:translateY(-4px);
  box-shadow:0 32px 72px rgba(0,0,0,.34),inset 0 1px 0 rgba(255,255,255,.3);
}

.slide{display:none}
.slide.active{display:block;animation:fade .6s var(--ease)}
@keyframes fade{
  from{opacity:0;transform:translateY(10px)}
  to{opacity:1;transform:none}
}
.slide h3{
  font-size:19px;
  margin-bottom:8px;
  color:#fff;
}
.slide p{
  color:#c9d8ee;
  font-size:14px;
  margin-bottom:14px;
}
.slide .tag{
  display:inline-block;
  background:rgba(255,255,255,.18);
  border:1px solid rgba(255,255,255,.24);
  padding:2px 12px;
  border-radius:var(--radius-pill);
  font-size:12px;
  margin-bottom:10px;
  color:#eaf2ff;
  letter-spacing:.04em;
}

.slider-dots{
  display:flex;
  gap:8px;
  margin-top:16px;
}
.slider-dots button{
  width:10px;
  height:10px;
  border-radius:50%;
  border:0;
  background:rgba(255,255,255,.4);
  cursor:pointer;
  padding:0;
  transition:background .3s var(--ease),transform .3s var(--ease),width .3s var(--ease);
}
.slider-dots button:hover{background:rgba(255,255,255,.75);transform:scale(1.15)}
.slider-dots button.active{
  background:#fff;
  width:26px;
  border-radius:var(--radius-pill);
}

/* ============ Breadcrumb ============ */
.breadcrumb{
  font-size:13px;
  color:var(--muted);
  padding:16px 0 0;
}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--brand)}

/* ============ Sections ============ */
section{
  padding:56px 0;
  position:relative;
}
section h2{
  font-size:clamp(21px,2.4vw,27px);
  margin-bottom:8px;
  font-weight:800;
  letter-spacing:.01em;
  position:relative;
  padding-left:16px;
}
section h2::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  transform:translateY(-50%);
  width:6px;
  height:1.05em;
  border-radius:var(--radius-pill);
  background:var(--brand-grad);
  box-shadow:0 0 16px rgba(47,107,255,.45);
}
section h3{
  font-size:18px;
  margin-bottom:8px;
}
section .sub{
  color:var(--muted);
  margin-bottom:28px;
  font-size:15px;
  padding-left:16px;
}

/* ============ Grid ============ */
.grid{display:grid;gap:20px}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}

/* ============ Card ============ */
.card{
  position:relative;
  background:linear-gradient(180deg,var(--card) 0%,var(--card-2) 100%);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:24px;
  box-shadow:var(--shadow-sm);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease),background .35s var(--ease);
  overflow:hidden;
  will-change:transform;
}
.card::before{
  content:"";
  position:absolute;
  inset:0;
  border-radius:inherit;
  pointer-events:none;
  background:linear-gradient(135deg,rgba(47,107,255,.10),transparent 42%,rgba(122,77,255,.10));
  opacity:0;
  transition:opacity .35s var(--ease);
}
.card::after{
  content:"";
  position:absolute;
  left:0;
  top:0;
  height:3px;
  width:100%;
  background:var(--brand-grad);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .4s var(--ease);
}
.card:hover{
  transform:translateY(-6px);
  border-color:rgba(47,107,255,.35);
  box-shadow:var(--shadow-md);
}
.card:hover::before{opacity:1}
.card:hover::after{transform:scaleX(1)}
.card > *{position:relative;z-index:1}
.card h3{
  font-size:18px;
  margin-bottom:8px;
  transition:color .3s var(--ease);
}
.card:hover h3{color:var(--brand)}
.card h4{
  font-size:15px;
  margin:14px 0 6px;
  color:var(--brand);
  font-weight:700;
}
.card p{
  color:var(--muted);
  font-size:14.5px;
}

/* Icon */
.icon{
  width:46px;
  height:46px;
  border-radius:14px;
  display:flex;
  align-items:center;
  justify-content:center;
  margin-bottom:16px;
  background:var(--brand-grad);
  color:#fff;
  font-weight:800;
  font-size:18px;
  box-shadow:0 8px 22px rgba(47,107,255,.30);
  transition:transform .4s var(--ease),box-shadow .4s var(--ease);
}
.card:hover .icon{
  transform:translateY(-2px) rotate(-6deg) scale(1.06);
  box-shadow:0 12px 28px rgba(122,77,255,.40);
}

/* ============ Stats ============ */
.stats{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:20px;
  text-align:center;
}
.stat{
  position:relative;
  background:var(--glass);
  -webkit-backdrop-filter:blur(14px) saturate(160%);
  backdrop-filter:blur(14px) saturate(160%);
  border:1px solid var(--glass-line);
  border-radius:var(--radius);
  padding:26px 18px;
  box-shadow:var(--shadow-sm);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease);
  overflow:hidden;
}
.stat::after{
  content:"";
  position:absolute;
  inset:auto -40% -60% auto;
  width:140px;
  height:140px;
  border-radius:50%;
  background:radial-gradient(circle,rgba(47,107,255,.18),transparent 70%);
  transition:transform .5s var(--ease);
}
.stat:hover{
  transform:translateY(-5px);
  border-color:rgba(47,107,255,.35);
  box-shadow:var(--shadow-md);
}
.stat:hover::after{transform:scale(1.35)}
.stat .num{
  font-size:clamp(26px,3vw,34px);
  font-weight:800;
  line-height:1.2;
  background:var(--brand-grad);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  font-variant-numeric:tabular-nums;
}
.stat .label{
  color:var(--muted);
  font-size:14px;
  margin-top:6px;
}

/* ============ Articles ============ */
.article-list{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:20px;
}
.article{
  position:relative;
  background:linear-gradient(180deg,var(--card) 0%,var(--card-2) 100%);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:22px;
  box-shadow:var(--shadow-sm);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease);
  overflow:hidden;
}
.article::before{
  content:"";
  position:absolute;
  left:0;
  top:0;
  bottom:0;
  width:3px;
  background:var(--brand-grad);
  transform:scaleY(0);
  transform-origin:top;
  transition:transform .4s var(--ease);
}
.article:hover{
  transform:translateY(-5px);
  border-color:rgba(47,107,255,.32);
  box-shadow:var(--shadow-md);
}
.article:hover::before{transform:scaleY(1)}
.article .meta{
  font-size:12.5px;
  color:var(--muted);
  margin-bottom:10px;
  letter-spacing:.02em;
}
.article h3{
  font-size:17px;
  margin-bottom:8px;
  transition:color .3s var(--ease);
}
.article:hover h3{color:var(--brand)}
.article p{
  color:var(--muted);
  font-size:14px;
  margin-bottom:12px;
}
.article a.more{
  font-size:14px;
  font-weight:700;
  display:inline-flex;
  align-items:center;
  gap:4px;
  transition:gap .3s var(--ease),color .3s var(--ease);
}
.article a.more:hover{
  gap:9px;
  color:var(--brand-2);
  text-decoration:none;
}

/* ============ FAQ ============ */
.faq-item{
  border:1px solid var(--line);
  border-radius:var(--radius);
  margin-bottom:12px;
  background:var(--card);
  overflow:hidden;
  box-shadow:var(--shadow-sm);
  transition:border-color .3s var(--ease),box-shadow .3s var(--ease),transform .3s var(--ease);
}
.faq-item:hover{
  border-color:rgba(47,107,255,.35);
  box-shadow:var(--shadow-md);
}
.faq-item.open{
  border-color:rgba(47,107,255,.45);
  box-shadow:var(--shadow-md);
}
.faq-q{
  width:100%;
  text-align:left;
  background:transparent;
  border:0;
  padding:17px 20px;
  font-size:15.5px;
  font-weight:700;
  cursor:pointer;
  color:var(--fg);
  font-family:inherit;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:16px;
  line-height:1.6;
  transition:color .25s var(--ease),background .25s var(--ease);
}
.faq-q:hover{color:var(--brand);background:rgba(47,107,255,.05)}
.faq-q .arrow{
  flex:0 0 auto;
  transition:transform .35s var(--ease),color .25s var(--ease);
  color:var(--brand);
  font-size:14px;
}
.faq-item.open .arrow{transform:rotate(180deg)}
.faq-a{
  max-height:0;
  overflow:hidden;
  transition:max-height .4s var(--ease),padding .4s var(--ease);
  padding:0 20px;
  color:var(--muted);
  font-size:14.5px;
}
.faq-a p{color:var(--muted);font-size:14.5px}
.faq-item.open .faq-a{
  max-height:520px;
  padding:0 20px 18px;
}

/* ============ HowTo ============ */
.howto-step{
  display:flex;
  gap:16px;
  margin-bottom:20px;
  padding:14px 16px;
  border-radius:var(--radius);
  border:1px solid transparent;
  transition:background .3s var(--ease),border-color .3s var(--ease),transform .3s var(--ease),box-shadow .3s var(--ease);
}
.howto-step:hover{
  background:var(--card);
  border-color:var(--line);
  transform:translateX(4px);
  box-shadow:var(--shadow-sm);
}
.howto-step .idx{
  flex:0 0 40px;
  height:40px;
  border-radius:50%;
  background:var(--brand-grad);
  color:#fff;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:800;
  box-shadow:0 8px 20px rgba(47,107,255,.30);
  transition:transform .4s var(--ease),box-shadow .4s var(--ease);
}
.howto-step:hover .idx{
  transform:scale(1.08) rotate(-8deg);
  box-shadow:0 12px 26px rgba(122,77,255,.40);
}
.howto-step h4{
  margin-bottom:4px;
  font-size:16px;
  font-weight:700;
  color:var(--fg);
}
.howto-step p{
  color:var(--muted);
  font-size:14.5px;
}

/* ============ Reveal ============ */
.reveal{
  opacity:0;
  transform:translateY(26px);
  transition:opacity .75s var(--ease),transform .75s var(--ease);
  will-change:opacity,transform;
}
.reveal.show{
  opacity:1;
  transform:none;
}
.reveal.show .card,
.reveal.show .article,
.reveal.show .stat{
  animation:cardIn .6s var(--ease) both;
}
.reveal.show .card:nth-child(2),
.reveal.show .article:nth-child(2),
.reveal.show .stat:nth-child(2){animation-delay:.06s}
.reveal.show .card:nth-child(3),
.reveal.show .article:nth-child(3),
.reveal.show .stat:nth-child(3){animation-delay:.12s}
.reveal.show .card:nth-child(4),
.reveal.show .article:nth-child(4),
.reveal.show .stat:nth-child(4){animation-delay:.18s}
.reveal.show .card:nth-child(5){animation-delay:.24s}
.reveal.show .card:nth-child(6){animation-delay:.30s}
@keyframes cardIn{
  from{opacity:0;transform:translateY(18px)}
  to{opacity:1;transform:none}
}

/* ============ Author box ============ */
.author-box{
  display:flex;
  gap:16px;
  align-items:center;
  background:var(--glass);
  -webkit-backdrop-filter:blur(14px) saturate(160%);
  backdrop-filter:blur(14px) saturate(160%);
  border:1px solid var(--glass-line);
  border-radius:var(--radius);
  padding:20px;
  margin-top:22px;
  box-shadow:var(--shadow-sm);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease);
}
.author-box:hover{
  transform:translateY(-3px);
  box-shadow:var(--shadow-md);
}
.author-box .avatar{
  width:56px;
  height:56px;
  border-radius:50%;
  background:var(--brand-grad);
  flex:0 0 auto;
  box-shadow:0 8px 22px rgba(47,107,255,.32);
  position:relative;
  overflow:hidden;
}
.author-box .avatar::after{
  content:"星";
  position:absolute;
  inset:0;
  display:flex;
  align-items:center;
  justify-content:center;
  color:#fff;
  font-weight:800;
  font-size:20px;
}
.author-box h4{margin-bottom:4px;font-size:16px}
.author-box p{font-size:14px;color:var(--muted)}

/* ============ Tag list ============ */
.tag-list{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  margin-top:18px;
}
.tag-list span{
  background:var(--bg-soft);
  border:1px solid var(--line);
  border-radius:var(--radius-pill);
  padding:5px 14px;
  font-size:13px;
  color:var(--muted);
  cursor:default;
  transition:color .25s var(--ease),border-color .25s var(--ease),background .25s var(--ease),transform .25s var(--ease),box-shadow .25s var(--ease);
}
.tag-list span:hover{
  color:var(--brand);
  border-color:rgba(47,107,255,.45);
  background:var(--card);
  transform:translateY(-2px);
  box-shadow:var(--shadow-sm);
}

/* ============ Footer ============ */
footer{
  position:relative;
  background:linear-gradient(160deg,#0b1a2b 0%,#0d2036 60%,#122b4a 100%);
  color:#c9d8ee;
  padding:56px 0 24px;
  margin-top:24px;
  overflow:hidden;
}
footer::before{
  content:"";
  position:absolute;
  inset:-20% -10% auto -10%;
  height:70%;
  background:
    radial-gradient(520px 260px at 12% 0%,rgba(47,107,255,.28),transparent 66%),
    radial-gradient(480px 240px at 88% 0%,rgba(122,77,255,.22),transparent 66%);
  pointer-events:none;
}
footer .wrap{position:relative;z-index:1}
footer a{color:#9fc0f5;transition:color .25s var(--ease),transform .25s var(--ease)}
footer a:hover{color:#fff}
footer p{color:#8fa6c2}

.footer-grid{
  display:grid;
  grid-template-columns:1.4fr 1fr 1fr 1fr;
  gap:28px;
}
footer h4{
  color:#fff;
  margin-bottom:14px;
  font-size:15px;
  letter-spacing:.03em;
  position:relative;
  padding-bottom:8px;
}
footer h4::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:26px;
  height:2px;
  border-radius:2px;
  background:var(--brand-grad);
}
footer ul{
  list-style:none;
  font-size:14px;
  line-height:2;
}
footer ul a{
  display:inline-block;
  transition:color .25s var(--ease),transform .25s var(--ease);
}
footer ul a:hover{transform:translateX(4px)}

.footer-bottom{
  border-top:1px solid rgba(255,255,255,.12);
  margin-top:36px;
  padding-top:20px;
  font-size:13px;
  color:#8fa6c2;
  display:flex;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:8px;
}

/* ============ To top ============ */
.to-top{
  position:fixed;
  right:22px;
  bottom:26px;
  width:48px;
  height:48px;
  border-radius:50%;
  background:var(--brand-grad);
  color:#fff;
  border:0;
  cursor:pointer;
  font-size:20px;
  display:none;
  z-index:200;
  box-shadow:0 12px 28px rgba(47,107,255,.45);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),opacity .3s var(--ease);
}
.to-top.show{
  display:block;
  animation:topIn .35s var(--ease);
}
.to-top:hover{
  transform:translateY(-4px) scale(1.06);
  box-shadow:0 18px 36px rgba(122,77,255,.55);
}
@keyframes topIn{
  from{opacity:0;transform:translateY(14px) scale(.9)}
  to{opacity:1;transform:none}
}

/* ============ Dark mode tweaks ============ */
body.dark .hero h1{text-shadow:0 2px 28px rgba(0,0,0,.6)}
body.dark .card,
body.dark .article{
  background:linear-gradient(180deg,var(--card) 0%,var(--card-2) 100%);
}
body.dark .search-box{background:var(--bg-soft)}
body.dark .tag-list span{background:var(--bg-soft)}

/* ============ Responsive ============ */
@media(max-width:1024px){
  .nav{gap:16px}
  .nav ul{gap:2px}
  .nav ul a{font-size:14px;padding:6px 8px}
  .search-box input{width:104px}
}

@media(max-width:900px){
  .hero{padding:52px 0 44px}
  .hero .wrap{grid-template-columns:1fr;gap:28px}
  .hero p{max-width:none}
  .grid-3,.grid-4,.article-list,.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .stats{grid-template-columns:repeat(2,minmax(0,1fr))}
  section{padding:46px 0}
}

@media(max-width:760px){
  .nav ul{
    display:none;
  }
  .nav ul.open{
    display:flex;
    position:absolute;
    top:68px;
    left:0;
    right:0;
    background:var(--glass);
    -webkit-backdrop-filter:blur(18px) saturate(170%);
    backdrop-filter:blur(18px) saturate(170%);
    flex-direction:column;
    align-items:stretch;
    padding:14px 20px 18px;
    border-bottom:1px solid var(--line);
    box-shadow:var(--shadow-md);
    gap:2px;
    animation:menuIn .28s var(--ease);
  }
  .nav ul.open a{
    display:block;
    padding:10px 12px;
    border-radius:var(--radius-sm);
    font-size:15px;
  }
  .nav ul.open a::after{display:none}
  .menu-toggle{display:block;order:2}
  .nav .logo{order:1}
  .nav-tools{order:3;margin-left:auto}
  @keyframes menuIn{
    from{opacity:0;transform:translateY(-8px)}
    to{opacity:1;transform:none}
  }
}

@media(max-width:640px){
  body{font-size:15.5px}
  .wrap{padding:0 16px}
  .nav{height:62px;gap:10px}
  .nav ul.open{top:62px}
  .search-box input{width:78px;font-size:13px}
  .search-box{padding:3px 4px 3px 10px}
  .search-box button{font-size:13px;padding:2px 6px}
  .btn{padding:6px 12px;font-size:13px}
  .grid-3,.grid-4,.article-list,.footer-grid,.grid-2{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
  .stat{padding:20px 12px}
  .hero{padding:40px 0 34px}
  .hero h1{font-size:24px;line-height:1.38}
  .hero p{font-size:15px}
  .hero .cta a{padding:10px 18px;font-size:14px}
  .slider{padding:20px}
  section{padding:38px 0}
  section h2{font-size:21px}
  section .sub{font-size:14px;margin-bottom:22px}
  .card,.article{padding:18px}
  .faq-q{padding:14px 16px;font-size:14.5px}
  .faq-a{padding:0 16px}
  .faq-item.open .faq-a{padding:0 16px 16px}
  .howto-step{padding:12px;gap:12px}
  .howto-step .idx{flex:0 0 34px;height:34px;font-size:14px}
  .author-box{flex-direction:column;align-items:flex-start;text-align:left}
  .footer-grid{gap:22px}
  .footer-bottom{flex-direction:column;align-items:flex-start;font-size:12.5px}
  .to-top{right:16px;bottom:18px;width:44px;height:44px;font-size:18px}
}

@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}
}