:root{
  --bg:#F7F9FC;
  --bg-soft:#EEF2F8;
  --card:#FFFFFF;
  --glass:rgba(255,255,255,.72);
  --glass-border:rgba(255,255,255,.55);
  --text:#17202A;
  --text-strong:#0F172A;
  --text-sub:#334155;
  --text-muted:#475569;
  --brand:#1F2937;
  --brand-2:#243447;
  --accent:#B45309;
  --accent-soft:#F59E0B;
  --link:#1D4ED8;
  --border:#D6DEE9;
  --shadow:0 8px 24px rgba(15,23,42,.08);
  --shadow-lg:0 18px 48px rgba(15,23,42,.16);
  --header-bg:rgba(255,255,255,.72);
  --grad-hero:linear-gradient(135deg,#1F2937 0%,#243447 45%,#334155 70%,#B45309 130%);
  --radius:16px;
  --radius-sm:10px;
  --radius-lg:22px;
}
html[data-theme="dark"]{
  --bg:#0B1220;
  --bg-soft:#0F172A;
  --card:#111C2E;
  --glass:rgba(17,28,46,.66);
  --glass-border:rgba(148,163,184,.22);
  --text:#E5E7EB;
  --text-strong:#F8FAFC;
  --text-sub:#E2E8F0;
  --text-muted:#CBD5E1;
  --brand:#E2E8F0;
  --brand-2:#F1F5F9;
  --accent:#FBBF24;
  --accent-soft:#F59E0B;
  --link:#93C5FD;
  --border:#243447;
  --shadow:0 8px 24px rgba(0,0,0,.45);
  --shadow-lg:0 18px 48px rgba(0,0,0,.6);
  --header-bg:rgba(11,18,32,.66);
  --grad-hero:linear-gradient(135deg,#060B14 0%,#0F172A 45%,#1E293B 75%,#7C2D12 130%);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.85;
  font-size:16px;
  transition:background .35s ease,color .35s ease;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  background:
    radial-gradient(circle at 12% 8%,rgba(180,83,9,.10),transparent 42%),
    radial-gradient(circle at 88% 18%,rgba(29,78,216,.10),transparent 46%),
    radial-gradient(circle at 50% 100%,rgba(31,41,55,.08),transparent 55%);
  pointer-events:none;
}
html[data-theme="dark"] body::before{
  background:
    radial-gradient(circle at 12% 8%,rgba(251,191,36,.08),transparent 42%),
    radial-gradient(circle at 88% 18%,rgba(96,165,250,.10),transparent 46%),
    radial-gradient(circle at 50% 100%,rgba(51,65,85,.25),transparent 55%);
}
h1,h2,h3,h4{color:var(--text-strong);line-height:1.35;margin:0 0 16px}
h1{font-size:2rem;font-weight:800;letter-spacing:.5px}
h2{font-size:1.55rem;font-weight:800;border-left:6px solid var(--accent);padding-left:14px;margin-top:48px}
h3{font-size:1.22rem;font-weight:700;margin-top:28px}
h4{font-size:1.05rem;font-weight:700;color:var(--text-sub)}
p{color:var(--text);margin:0 0 14px}
a{color:var(--link);text-decoration:none;transition:color .25s ease}
a:hover,a:focus{text-decoration:underline;color:var(--accent)}
ul,ol{color:var(--text);padding-left:22px}
li{margin-bottom:8px}
strong{color:var(--text-strong)}
img,svg{max-width:100%}
.container{max-width:1180px;margin:0 auto;padding:0 20px}
.skip-link{position:absolute;left:-9999px;top:0;background:var(--accent);color:#fff;padding:10px 16px;z-index:999;border-radius:0 0 10px 0}
.skip-link:focus{left:10px;top:10px}
::selection{background:var(--accent-soft);color:#1F2937}

/* ============ Header ============ */
.site-header{
  position:sticky;top:0;z-index:100;
  background:var(--header-bg);
  -webkit-backdrop-filter:blur(16px) saturate(180%);
  backdrop-filter:blur(16px) saturate(180%);
  border-bottom:1px solid var(--glass-border);
  box-shadow:0 4px 20px rgba(15,23,42,.06);
  transition:background .35s ease,border-color .35s ease,box-shadow .35s ease;
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 20px;max-width:1180px;margin:0 auto}
.logo{display:flex;align-items:center;gap:10px;font-size:1.15rem;font-weight:800;color:var(--text-strong);transition:transform .3s ease}
.logo svg{flex:0 0 auto;border-radius:9px;transition:transform .4s cubic-bezier(.34,1.56,.64,1)}
.logo:hover{text-decoration:none;transform:translateY(-1px)}
.logo:hover svg{transform:rotate(-6deg) scale(1.06)}
.nav{display:flex;gap:6px;flex-wrap:wrap}
.nav a{
  position:relative;
  color:var(--text-sub);font-weight:600;font-size:.94rem;
  padding:8px 12px;border-radius:var(--radius-sm);
  transition:background .25s ease,color .25s ease,transform .25s ease;
}
.nav a::after{
  content:"";position:absolute;left:12px;right:12px;bottom:4px;height:2px;
  background:var(--accent);border-radius:2px;
  transform:scaleX(0);transform-origin:left;
  transition:transform .3s cubic-bezier(.4,0,.2,1);
}
.nav a:hover,.nav a:focus{background:var(--bg-soft);color:var(--text-strong);text-decoration:none;transform:translateY(-1px)}
.nav a:hover::after,.nav a:focus::after{transform:scaleX(1)}
.header-tools{display:flex;align-items:center;gap:8px}
.search-box{
  display:flex;align-items:center;border:1px solid var(--border);border-radius:var(--radius-sm);
  overflow:hidden;background:var(--card);
  transition:border-color .25s ease,box-shadow .25s ease;
}
.search-box:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px rgba(180,83,9,.16)}
.search-box input{
  border:0;outline:0;padding:8px 10px;background:transparent;
  color:var(--text);font-size:.9rem;width:130px;
}
.search-box input::placeholder{color:var(--text-muted)}
.search-box button{
  border:0;background:var(--brand);color:#fff;padding:8px 12px;cursor:pointer;
  font-weight:700;font-size:.9rem;
  transition:background .25s ease,color .25s ease;
}
.search-box button:hover{background:var(--accent);color:#fff}
html[data-theme="dark"] .search-box button{background:#334155;color:#F8FAFC}
html[data-theme="dark"] .search-box button:hover{background:var(--accent);color:#1F2937}
.theme-btn{
  border:1px solid var(--border);background:var(--card);color:var(--text-sub);
  border-radius:var(--radius-sm);padding:8px 12px;cursor:pointer;font-weight:700;font-size:.9rem;
  transition:color .25s ease,border-color .25s ease,transform .25s ease,background .25s ease;
}
.theme-btn:hover{color:var(--text-strong);border-color:var(--accent);transform:translateY(-1px)}
.theme-btn:active{transform:scale(.96)}
.menu-btn{
  display:none;border:1px solid var(--border);background:var(--card);color:var(--text-sub);
  border-radius:var(--radius-sm);padding:8px 12px;cursor:pointer;font-weight:700;
  transition:color .25s ease,border-color .25s ease;
}
.menu-btn:hover{color:var(--text-strong);border-color:var(--accent)}

/* ============ Hero ============ */
.hero{
  background:var(--grad-hero);
  color:#F8FAFC;padding:72px 0 60px;position:relative;overflow:hidden;
}
.hero::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(circle at 85% 20%,rgba(255,255,255,.18),transparent 55%);
  pointer-events:none;
}
.hero::after{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(circle at 15% 85%,rgba(251,191,36,.22),transparent 45%),
    radial-gradient(circle at 70% 10%,rgba(147,197,253,.18),transparent 50%);
  pointer-events:none;
  animation:heroFloat 14s ease-in-out infinite alternate;
}
@keyframes heroFloat{
  0%{transform:translate3d(0,0,0) scale(1)}
  100%{transform:translate3d(-2%,2%,0) scale(1.06)}
}
.hero .container{position:relative;z-index:2}
.hero h1{color:#FFFFFF;font-size:2.35rem;text-shadow:0 2px 12px rgba(0,0,0,.45);animation:heroIn .8s cubic-bezier(.22,1,.36,1) both}
.hero p{color:#E2E8F0;max-width:820px;font-size:1.05rem;text-shadow:0 1px 6px rgba(0,0,0,.35);animation:heroIn .8s .12s cubic-bezier(.22,1,.36,1) both}
.hero .tagline{color:#FDE68A;font-weight:700;letter-spacing:1px;margin-bottom:10px;animation:heroIn .8s .04s cubic-bezier(.22,1,.36,1) both}
.hero-actions{margin-top:22px;display:flex;gap:12px;flex-wrap:wrap;animation:heroIn .8s .2s cubic-bezier(.22,1,.36,1) both}
@keyframes heroIn{
  from{opacity:0;transform:translateY(26px)}
  to{opacity:1;transform:none}
}
.btn{
  display:inline-block;padding:12px 22px;border-radius:var(--radius-sm);font-weight:800;
  text-decoration:none;
  transition:transform .3s cubic-bezier(.34,1.56,.64,1),box-shadow .3s ease,background .3s ease,color .3s ease;
}
.btn-primary{background:#F59E0B;color:#1F2937;box-shadow:0 8px 22px rgba(245,158,11,.35)}
.btn-primary:hover{background:#FBBF24;color:#111827;text-decoration:none;transform:translateY(-3px);box-shadow:0 14px 30px rgba(245,158,11,.45)}
.btn-ghost{
  background:rgba(255,255,255,.10);color:#F8FAFC;
  border:1px solid rgba(255,255,255,.5);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
}
.btn-ghost:hover{background:rgba(255,255,255,.22);color:#FFFFFF;text-decoration:none;transform:translateY(-3px)}

/* ============ Carousel ============ */
.carousel{
  position:relative;margin-top:38px;border-radius:var(--radius-lg);overflow:hidden;
  box-shadow:var(--shadow-lg);
  background:var(--glass);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  border:1px solid var(--glass-border);
  animation:heroIn .9s .28s cubic-bezier(.22,1,.36,1) both;
}
.slides{display:flex;transition:transform .65s cubic-bezier(.4,0,.2,1)}
.slide{min-width:100%;padding:0}
.slide svg{display:block;width:100%;height:auto}
.carousel-dots{position:absolute;bottom:14px;left:50%;transform:translateX(-50%);display:flex;gap:8px;z-index:3}
.dot{
  width:10px;height:10px;border-radius:50%;background:rgba(255,255,255,.55);
  border:0;cursor:pointer;padding:0;
  transition:background .3s ease,width .3s ease,border-radius .3s ease,transform .3s ease;
}
.dot:hover{background:rgba(255,255,255,.9);transform:scale(1.15)}
.dot.active{background:#F59E0B;width:26px;border-radius:6px}
.carousel-prev,.carousel-next{
  position:absolute;top:50%;transform:translateY(-50%);
  background:rgba(15,23,42,.55);color:#F8FAFC;border:0;width:42px;height:42px;
  border-radius:50%;cursor:pointer;font-size:1.2rem;line-height:1;z-index:3;
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  transition:background .3s ease,transform .3s ease;
}
.carousel-prev{left:14px}
.carousel-next{right:14px}
.carousel-prev:hover,.carousel-next:hover{background:rgba(15,23,42,.88);transform:translateY(-50%) scale(1.08)}

/* ============ Breadcrumb ============ */
.breadcrumb{
  background:var(--glass);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);padding:12px 0;font-size:.9rem;
}
.breadcrumb ol{list-style:none;display:flex;gap:8px;padding:0;margin:0;flex-wrap:wrap;color:var(--text-muted)}
.breadcrumb li+li::before{content:"›";margin-right:8px;color:var(--text-muted)}
.breadcrumb a{color:var(--link);font-weight:600}

/* ============ Sections & Cards ============ */
section{padding:14px 0}
.card{
  position:relative;
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:24px;box-shadow:var(--shadow);margin-bottom:22px;
  transition:background .35s ease,border-color .35s ease,transform .35s cubic-bezier(.22,1,.36,1),box-shadow .35s ease;
  overflow:hidden;
}
.card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--accent),var(--accent-soft),transparent);
  transform:scaleX(0);transform-origin:left;
  transition:transform .45s cubic-bezier(.4,0,.2,1);
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--accent)}
.card:hover::before{transform:scaleX(1)}
.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)}
.stat{text-align:center;padding:24px 20px}
.stat .num{font-size:2rem;font-weight:800;color:var(--accent);letter-spacing:1px}
.stat .label{color:var(--text-sub);font-weight:600;font-size:.95rem}

/* ============ Articles ============ */
.article-card{display:flex;flex-direction:column;height:100%}
.article-card h3{margin-top:0;transition:color .3s ease}
.article-card:hover h3{color:var(--accent)}
.meta{font-size:.85rem;color:var(--text-muted);margin-bottom:8px}
.summary{color:var(--text-sub);flex:1}
.read-more{
  font-weight:700;color:var(--link);margin-top:10px;display:inline-block;
  transition:transform .3s ease,color .3s ease;
}
.read-more:hover{transform:translateX(5px);text-decoration:none;color:var(--accent)}

/* ============ FAQ ============ */
.faq-item{
  border:1px solid var(--border);border-radius:12px;margin-bottom:12px;overflow:hidden;
  background:var(--card);
  transition:border-color .3s ease,box-shadow .3s ease;
}
.faq-item:hover{border-color:var(--accent);box-shadow:0 6px 18px rgba(15,23,42,.08)}
.faq-q{
  width:100%;text-align:left;background:var(--bg-soft);border:0;cursor:pointer;
  padding:16px 18px;font-size:1rem;font-weight:700;color:var(--text-strong);
  display:flex;justify-content:space-between;align-items:center;gap:12px;
  font-family:inherit;
  transition:background .3s ease;
}
.faq-q:hover{background:var(--border)}
.faq-q .arrow{transition:transform .35s cubic-bezier(.4,0,.2,1);color:var(--accent);font-weight:800;flex:0 0 auto}
.faq-item.open .arrow{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .4s cubic-bezier(.4,0,.2,1),padding .4s ease;padding:0 18px}
.faq-item.open .faq-a{max-height:480px;padding:14px 18px 18px}
.faq-a p{color:var(--text);margin:0}

/* ============ Steps ============ */
.step{display:flex;gap:16px;margin-bottom:18px;transition:transform .3s ease}
.step:hover{transform:translateX(6px)}
.step-num{
  flex:0 0 40px;height:40px;border-radius:50%;background:var(--brand);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:800;
  box-shadow:0 6px 16px rgba(31,41,55,.28);
  transition:transform .35s cubic-bezier(.34,1.56,.64,1),background .3s ease;
}
.step:hover .step-num{transform:scale(1.1) rotate(-6deg);background:var(--accent)}
html[data-theme="dark"] .step-num{background:#334155;color:#F8FAFC}
html[data-theme="dark"] .step:hover .step-num{background:var(--accent);color:#1F2937}

/* ============ Table ============ */
table{
  width:100%;border-collapse:collapse;margin:16px 0;font-size:.95rem;
  border-radius:12px;overflow:hidden;box-shadow:var(--shadow);
}
th,td{border:1px solid var(--border);padding:12px;text-align:left;transition:background .25s ease}
th{background:var(--bg-soft);color:var(--text-strong);font-weight:800}
td{color:var(--text)}
tbody tr{transition:background .25s ease}
tbody tr:hover{background:var(--bg-soft)}

/* ============ Contact ============ */
.contact-list{list-style:none;padding:0}
.contact-list li{
  padding:10px 0;border-bottom:1px dashed var(--border);color:var(--text);
  transition:padding-left .3s ease,color .3s ease;
}
.contact-list li:hover{padding-left:6px}
.contact-list strong{color:var(--text-strong)}

/* ============ Footer ============ */
.site-footer{
  position:relative;
  background:linear-gradient(160deg,#111827 0%,#0F172A 60%,#1E293B 100%);
  color:#E5E7EB;padding:52px 0 24px;margin-top:48px;overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--accent),var(--accent-soft),transparent);
}
html[data-theme="dark"] .site-footer{background:linear-gradient(160deg,#060B14 0%,#0B1220 60%,#111C2E 100%)}
.site-footer h4{color:#F8FAFC;margin-bottom:14px}
.site-footer a{color:#BFDBFE;transition:color .25s ease,transform .25s ease;display:inline-block}
.site-footer a:hover{color:#FBBF24;text-decoration:none;transform:translateX(4px)}
.site-footer ul{list-style:none;padding:0}
.site-footer li{margin-bottom:8px}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:28px}
.footer-bottom{border-top:1px solid #334155;margin-top:28px;padding-top:18px;font-size:.88rem;color:#CBD5E1;text-align:center}
.footer-bottom p{margin:0;color:#CBD5E1}

/* ============ Back to top ============ */
#backTop{
  position:fixed;right:22px;bottom:26px;width:48px;height:48px;border-radius:50%;
  background:var(--accent);color:#1F2937;border:0;font-size:1.3rem;font-weight:800;
  cursor:pointer;display:none;z-index:200;box-shadow:var(--shadow-lg);
  transition:transform .3s cubic-bezier(.34,1.56,.64,1),background .3s ease,opacity .3s ease;
}
#backTop.show{display:block;animation:popIn .35s cubic-bezier(.34,1.56,.64,1)}
#backTop:hover{transform:translateY(-4px) scale(1.08);background:var(--accent-soft)}
@keyframes popIn{
  from{opacity:0;transform:scale(.6)}
  to{opacity:1;transform:scale(1)}
}

/* ============ Reveal animation ============ */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s cubic-bezier(.22,1,.36,1),transform .7s cubic-bezier(.22,1,.36,1)}
.reveal.visible{opacity:1;transform:none}

/* ============ Responsive ============ */
@media(max-width:900px){
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .nav{
    display:none;position:absolute;top:100%;left:0;right:0;
    background:var(--glass);
    -webkit-backdrop-filter:blur(18px) saturate(180%);
    backdrop-filter:blur(18px) saturate(180%);
    flex-direction:column;padding:12px;border-bottom:1px solid var(--border);
    box-shadow:var(--shadow);
    animation:menuDrop .3s cubic-bezier(.22,1,.36,1);
  }
  .nav.open{display:flex}
  .nav a::after{display:none}
  .menu-btn{display:block}
  .hero h1{font-size:1.8rem}
  .hero{padding:56px 0 48px}
}
@keyframes menuDrop{
  from{opacity:0;transform:translateY(-10px)}
  to{opacity:1;transform:none}
}
@media(max-width:600px){
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .search-box input{width:90px}
  h1{font-size:1.6rem}
  h2{font-size:1.3rem}
  .hero h1{font-size:1.5rem}
  .hero p{font-size:.98rem}
  .carousel-prev,.carousel-next{width:34px;height:34px;font-size:1rem}
  .card{padding:18px}
  .stat .num{font-size:1.6rem}
  #backTop{right:14px;bottom:18px;width:42px;height:42px}
}

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

/* ============ Print ============ */
@media print{
  .site-header,.site-footer,#backTop,.carousel,.hero-actions{display:none !important}
  body{background:#fff;color:#000}
  .card{box-shadow:none;border:1px solid #ccc}
}