:root{
  --brand:#8e44ad;
  --brand-2:#c0392b;
  --brand-3:#2980b9;
  --brand-glow:rgba(142,68,173,.35);
  --accent:#f1c40f;
  --bg:#ffffff;
  --bg-soft:#f7f4fb;
  --bg-glass:rgba(255,255,255,.72);
  --bg-glass-strong:rgba(255,255,255,.9);
  --text:#222;
  --text-soft:#555;
  --line:#e6e0ee;
  --radius:16px;
  --radius-sm:10px;
  --shadow:0 6px 24px rgba(80,40,120,.10);
  --shadow-lg:0 16px 48px rgba(80,40,120,.18);
  --grad-hero:linear-gradient(135deg,#f3e9fb 0%,#e9f1fb 55%,#eafaf1 100%);
  --grad-brand:linear-gradient(135deg,#8e44ad 0%,#2980b9 100%);
  --grad-accent:linear-gradient(135deg,#8e44ad 0%,#c0392b 100%);
  --ease:cubic-bezier(.22,.61,.36,1);
}

body.dark{
  --bg:#141018;
  --bg-soft:#1d1824;
  --bg-glass:rgba(29,24,36,.72);
  --bg-glass-strong:rgba(29,24,36,.92);
  --text:#eae6f0;
  --text-soft:#b9b2c6;
  --line:#332b40;
  --shadow:0 6px 24px rgba(0,0,0,.4);
  --shadow-lg:0 16px 48px rgba(0,0,0,.55);
  --grad-hero:linear-gradient(135deg,#241a30 0%,#1a2432 55%,#14261e 100%);
}

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

html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}

body{
  font-family:"Microsoft YaHei","PingFang SC","Hiragino Sans GB",Arial,sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.8;
  font-size:16px;
  overflow-x:hidden;
  transition:background .4s var(--ease),color .4s var(--ease);
}

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

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

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

.container{max-width:1180px;margin:0 auto;padding:0 20px}

/* ---------- Header ---------- */
header.site-header{
  position:sticky;
  top:0;
  z-index:1000;
  background:var(--bg-glass);
  -webkit-backdrop-filter:blur(16px) saturate(160%);
  backdrop-filter:blur(16px) saturate(160%);
  border-bottom:1px solid var(--line);
  box-shadow:0 2px 18px rgba(80,40,120,.06);
  transition:background .4s var(--ease),border-color .4s var(--ease);
}

.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:12px 0;
}

.logo{
  display:flex;
  align-items:center;
  gap:10px;
  font-size:20px;
  font-weight:700;
  color:var(--brand);
  flex-shrink:0;
}
.logo:hover{text-decoration:none}
.logo svg{
  width:38px;
  height:38px;
  transition:transform .4s var(--ease);
  filter:drop-shadow(0 3px 8px var(--brand-glow));
}
.logo:hover svg{transform:rotate(-8deg) scale(1.08)}

nav.main-nav ul{
  display:flex;
  gap:20px;
  list-style:none;
  flex-wrap:wrap;
}
nav.main-nav a{
  color:var(--text-soft);
  font-size:15px;
  position:relative;
  padding:4px 0;
}
nav.main-nav a::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:0;
  height:2px;
  border-radius:2px;
  background:var(--grad-brand);
  transition:width .3s var(--ease);
}
nav.main-nav a:hover{color:var(--brand);text-decoration:none}
nav.main-nav a:hover::after{width:100%}

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

.search-box{
  display:flex;
  border:1px solid var(--line);
  border-radius:22px;
  overflow:hidden;
  background:var(--bg-soft);
  transition:border-color .3s var(--ease),box-shadow .3s var(--ease);
}
.search-box:focus-within{
  border-color:var(--brand);
  box-shadow:0 0 0 4px var(--brand-glow);
}
.search-box input{
  border:0;
  background:transparent;
  padding:7px 14px;
  outline:none;
  color:var(--text);
  width:150px;
  font-size:14px;
  font-family:inherit;
}
.search-box input::placeholder{color:var(--text-soft);opacity:.75}
.search-box button{
  border:0;
  background:var(--grad-brand);
  color:#fff;
  padding:0 16px;
  cursor:pointer;
  font-size:14px;
  font-family:inherit;
  transition:filter .25s var(--ease);
}
.search-box button:hover{filter:brightness(1.1)}

.icon-btn{
  border:1px solid var(--line);
  background:var(--bg-soft);
  color:var(--text);
  border-radius:50%;
  width:38px;
  height:38px;
  cursor:pointer;
  font-size:16px;
  display:flex;
  align-items:center;
  justify-content:center;
  transition:transform .3s var(--ease),background .3s var(--ease),box-shadow .3s var(--ease);
}
.icon-btn:hover{
  transform:translateY(-2px) rotate(8deg);
  background:var(--bg-glass-strong);
  box-shadow:var(--shadow);
}

.menu-toggle{display:none}

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

/* ---------- Hero ---------- */
.hero{
  background:var(--grad-hero);
  padding:48px 0;
  position:relative;
  overflow:hidden;
}
.hero::before{
  content:"";
  position:absolute;
  width:420px;
  height:420px;
  border-radius:50%;
  background:radial-gradient(circle,rgba(142,68,173,.22),transparent 70%);
  top:-160px;
  right:-120px;
  pointer-events:none;
}
.hero::after{
  content:"";
  position:absolute;
  width:360px;
  height:360px;
  border-radius:50%;
  background:radial-gradient(circle,rgba(41,128,185,.18),transparent 70%);
  bottom:-180px;
  left:-100px;
  pointer-events:none;
}
.hero-inner{
  display:grid;
  grid-template-columns:1.2fr .8fr;
  gap:32px;
  align-items:center;
  position:relative;
  z-index:1;
}
.hero h1{
  font-size:32px;
  line-height:1.4;
  margin-bottom:16px;
  background:var(--grad-accent);
  -webkit-background-clip:text;
  background-clip:text;
  -webkit-text-fill-color:transparent;
  color:var(--brand);
}
.hero p{color:var(--text-soft);margin-bottom:18px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}

/* ---------- Buttons ---------- */
.btn{
  display:inline-block;
  padding:11px 26px;
  border-radius:26px;
  font-size:15px;
  cursor:pointer;
  border:0;
  font-family:inherit;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),background .3s var(--ease);
  will-change:transform;
}
.btn-primary{
  background:var(--grad-brand);
  color:#fff;
  box-shadow:0 6px 18px var(--brand-glow);
}
.btn-primary:hover{
  transform:translateY(-3px);
  box-shadow:0 12px 28px var(--brand-glow);
  text-decoration:none;
  color:#fff;
}
.btn-ghost{
  background:var(--bg-glass);
  border:1px solid var(--brand);
  color:var(--brand);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
}
.btn-ghost:hover{
  transform:translateY(-3px);
  background:var(--brand);
  color:#fff;
  text-decoration:none;
  box-shadow:0 10px 24px var(--brand-glow);
}

/* ---------- Slider ---------- */
.slider{
  position:relative;
  border-radius:var(--radius);
  overflow:hidden;
  box-shadow:var(--shadow-lg);
  background:var(--bg);
  transition:transform .4s var(--ease);
}
.slider:hover{transform:translateY(-4px)}
.slide{display:none;animation:fadeSlide .6s var(--ease)}
.slide.active{display:block}
.slide svg{width:100%;height:auto}
@keyframes fadeSlide{
  from{opacity:0;transform:scale(1.03)}
  to{opacity:1;transform:scale(1)}
}
.slider-dots{
  position:absolute;
  bottom:12px;
  left:50%;
  transform:translateX(-50%);
  display:flex;
  gap:8px;
}
.slider-dots span{
  width:10px;
  height:10px;
  border-radius:50%;
  background:rgba(255,255,255,.6);
  cursor:pointer;
  transition:background .3s var(--ease),transform .3s var(--ease),width .3s var(--ease);
}
.slider-dots span:hover{transform:scale(1.25)}
.slider-dots span.active{background:#fff;width:22px;border-radius:6px}

/* ---------- Stats ---------- */
.stats{
  background:var(--bg-soft);
  padding:40px 0;
  transition:background .4s var(--ease);
}
.stats-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:20px;
  text-align:center;
}
.stat-num{
  font-size:34px;
  font-weight:700;
  background:var(--grad-brand);
  -webkit-background-clip:text;
  background-clip:text;
  -webkit-text-fill-color:transparent;
  color:var(--brand);
  line-height:1.3;
}
.stat-label{color:var(--text-soft);font-size:14px}

/* ---------- Sections ---------- */
section{padding:52px 0}
section h2{
  font-size:26px;
  margin-bottom:10px;
  color:var(--text);
  position:relative;
  padding-left:16px;
}
section h2::before{
  content:"";
  position:absolute;
  left:0;
  top:6px;
  bottom:6px;
  width:5px;
  border-radius:3px;
  background:var(--grad-brand);
}
section h3{font-size:19px;margin:24px 0 8px;color:var(--brand-3)}
section h4{font-size:16px;margin:16px 0 6px;color:var(--text)}
.lead{color:var(--text-soft);margin-bottom:22px}

/* ---------- Grids ---------- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}

/* ---------- Cards ---------- */
.card{
  background:var(--bg-glass);
  -webkit-backdrop-filter:blur(12px) saturate(150%);
  backdrop-filter:blur(12px) saturate(150%);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:24px;
  box-shadow:var(--shadow);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease);
  position:relative;
  overflow:hidden;
}
.card::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:3px;
  background:var(--grad-brand);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .4s var(--ease);
}
.card:hover{
  transform:translateY(-6px);
  box-shadow:var(--shadow-lg);
  border-color:var(--brand);
}
.card:hover::before{transform:scaleX(1)}
.card h3{margin-top:0}
.card p{color:var(--text-soft);font-size:15px}

.article-card{display:flex;flex-direction:column;gap:10px}
.article-meta{font-size:13px;color:var(--text-soft)}

.tag{
  display:inline-block;
  background:var(--bg-soft);
  color:var(--brand);
  border-radius:14px;
  padding:2px 12px;
  font-size:13px;
  margin-right:6px;
  width:fit-content;
  border:1px solid var(--line);
  transition:background .3s var(--ease),color .3s var(--ease);
}
.card:hover .tag{background:var(--brand);color:#fff}

/* ---------- Anchor Nav ---------- */
.anchor-nav{
  background:var(--bg-glass);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:18px 22px;
  margin-bottom:10px;
  box-shadow:var(--shadow);
}
.anchor-nav ul{list-style:none;display:flex;flex-wrap:wrap;gap:10px 22px}
.anchor-nav a{
  font-size:14px;
  color:var(--brand-3);
  position:relative;
  padding:2px 0;
}
.anchor-nav a::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:0;
  height:1.5px;
  background:var(--brand-3);
  transition:width .3s var(--ease);
}
.anchor-nav a:hover{text-decoration:none;color:var(--brand)}
.anchor-nav a:hover::after{width:100%}

/* ---------- FAQ ---------- */
.faq-item{
  border:1px solid var(--line);
  border-radius:var(--radius);
  margin-bottom:12px;
  overflow:hidden;
  background:var(--bg-glass);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  transition:box-shadow .3s var(--ease),border-color .3s var(--ease);
}
.faq-item:hover{box-shadow:var(--shadow)}
.faq-item.open{border-color:var(--brand);box-shadow:var(--shadow)}
.faq-q{
  width:100%;
  text-align:left;
  padding:16px 20px;
  background:transparent;
  border:0;
  font-size:16px;
  font-weight:600;
  color:var(--text);
  cursor:pointer;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  font-family:inherit;
  transition:color .3s var(--ease),background .3s var(--ease);
}
.faq-q:hover{color:var(--brand);background:var(--bg-soft)}
.faq-q .arrow{transition:transform .35s var(--ease);flex-shrink:0;color:var(--brand)}
.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(--text-soft);
  font-size:15px;
}
.faq-item.open .faq-a{max-height:700px;padding:0 20px 18px}

/* ---------- Steps ---------- */
.steps{counter-reset:step;list-style:none}
.steps li{position:relative;padding-left:56px;margin-bottom:20px}
.steps li::before{
  counter-increment:step;
  content:counter(step);
  position:absolute;
  left:0;
  top:0;
  width:38px;
  height:38px;
  border-radius:50%;
  background:var(--grad-brand);
  color:#fff;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:700;
  box-shadow:0 4px 12px var(--brand-glow);
  transition:transform .3s var(--ease);
}
.steps li:hover::before{transform:scale(1.1)}
.steps li h4{margin-top:4px}

/* ---------- Tables ---------- */
table{
  width:100%;
  border-collapse:collapse;
  margin:16px 0;
  font-size:15px;
  border-radius:var(--radius-sm);
  overflow:hidden;
  box-shadow:var(--shadow);
}
th,td{border:1px solid var(--line);padding:10px 12px;text-align:left}
th{background:var(--bg-soft);color:var(--text);font-weight:600}
tbody tr{transition:background .25s var(--ease)}
tbody tr:hover{background:var(--bg-soft)}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.contact-item{
  display:flex;
  gap:12px;
  align-items:flex-start;
  padding:14px;
  border-radius:var(--radius-sm);
  background:var(--bg-glass);
  border:1px solid var(--line);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease);
}
.contact-item:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.contact-item svg{width:26px;height:26px;flex-shrink:0;margin-top:4px}

/* ---------- Author Box ---------- */
.author-box{
  display:flex;
  gap:16px;
  align-items:center;
  background:var(--bg-glass);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:18px 22px;
  margin-top:24px;
  box-shadow:var(--shadow);
}
.author-box svg{width:56px;height:56px;flex-shrink:0}

/* ---------- Notice ---------- */
.notice{
  background:#fff8e6;
  border-left:4px solid #f39c12;
  padding:14px 18px;
  border-radius:8px;
  color:#7a5c00;
  font-size:14px;
  margin:16px 0;
}
body.dark .notice{background:#2e2513;color:#f0d68a}

/* ---------- Sitemap ---------- */
.sitemap-list{columns:2;list-style:none;font-size:14px}
.sitemap-list li{margin-bottom:8px;break-inside:avoid}
.sitemap-list a{color:var(--text-soft)}
.sitemap-list a:hover{color:var(--brand)}

/* ---------- Footer ---------- */
footer.site-footer{
  background:linear-gradient(160deg,#1e1529 0%,#171220 60%,#131019 100%);
  color:#c9c0d8;
  padding:48px 0 20px;
  margin-top:20px;
}
footer.site-footer a{color:#d9cdea}
footer.site-footer a:hover{color:#fff}
.footer-grid{
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1.4fr;
  gap:28px;
}
.footer-grid h4{color:#fff;margin-bottom:12px;font-size:16px}
.footer-grid ul{list-style:none}
.footer-grid li{margin-bottom:8px;font-size:14px}
.footer-grid p{font-size:14px;color:#b5aac6}
.footer-bottom{
  border-top:1px solid #352a45;
  margin-top:28px;
  padding-top:18px;
  font-size:13px;
  color:#9b90ad;
  text-align:center;
}

/* ---------- Back Top ---------- */
.back-top{
  position:fixed;
  right:22px;
  bottom:26px;
  width:46px;
  height:46px;
  border-radius:50%;
  background:var(--grad-brand);
  color:#fff;
  border:0;
  cursor:pointer;
  font-size:20px;
  box-shadow:var(--shadow-lg);
  display:none;
  align-items:center;
  justify-content:center;
  z-index:999;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease);
}
.back-top.show{display:flex}
.back-top:hover{transform:translateY(-4px) scale(1.05)}

/* ---------- Reveal Animation ---------- */
.reveal{
  opacity:0;
  transform:translateY(28px);
  transition:opacity .7s var(--ease),transform .7s var(--ease);
  will-change:opacity,transform;
}
.reveal.visible{opacity:1;transform:none}

/* ---------- Responsive ---------- */
@media(max-width:900px){
  .hero-inner,.grid-3,.grid-2,.stats-grid,.contact-grid,.footer-grid{grid-template-columns:1fr}
  .hero h1{font-size:26px}
  .hero{padding:36px 0}
  nav.main-nav{
    display:none;
    position:absolute;
    top:100%;
    left:0;
    right:0;
    background:var(--bg-glass-strong);
    -webkit-backdrop-filter:blur(18px);
    backdrop-filter:blur(18px);
    border-bottom:1px solid var(--line);
    padding:16px 20px;
    box-shadow:var(--shadow);
  }
  nav.main-nav.open{display:block;animation:slideDown .3s var(--ease)}
  nav.main-nav ul{flex-direction:column;gap:14px}
  .menu-toggle{display:flex}
  .search-box input{width:100px}
  .sitemap-list{columns:1}
  section{padding:40px 0}
  section h2{font-size:23px}
  .stat-num{font-size:28px}
  .footer-grid{gap:22px}
}

@media(max-width:560px){
  .header-inner{gap:10px}
  .logo span{font-size:17px}
  .logo svg{width:32px;height:32px}
  .search-box{display:none}
  .hero h1{font-size:22px}
  .btn{padding:10px 20px;font-size:14px}
  .card{padding:18px}
  .contact-item{padding:12px}
  .author-box{flex-direction:column;text-align:center}
  table{font-size:13px}
  th,td{padding:8px 9px}
}

@keyframes slideDown{
  from{opacity:0;transform:translateY(-10px)}
  to{opacity:1;transform:none}
}

@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.01ms !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
  .reveal{opacity:1;transform:none}
}