:root{
  --bg:#0b1120;
  --bg-soft:#0f172a;
  --fg:#e2e8f0;
  --muted:#94a3b8;
  --brand:#38bdf8;
  --brand-2:#a855f7;
  --brand-3:#f472b6;
  --card:rgba(30,41,59,.72);
  --card-solid:#1e293b;
  --line:rgba(51,65,85,.85);
  --glass:rgba(15,23,42,.62);
  --shadow:0 18px 48px -18px rgba(2,6,23,.9);
  --radius:16px;
  --radius-sm:12px;
  --grad-hero:linear-gradient(135deg,#0ea5e9 0%,#6366f1 45%,#a855f7 100%);
  --grad-line:linear-gradient(90deg,var(--brand),var(--brand-2));
  --ease:cubic-bezier(.22,.61,.36,1);
}

@media (prefers-color-scheme: light){
  :root{
    --bg:#f4f7fb;
    --bg-soft:#ffffff;
    --fg:#0f172a;
    --muted:#5b6b82;
    --card:rgba(255,255,255,.78);
    --card-solid:#ffffff;
    --line:rgba(148,163,184,.45);
    --glass:rgba(255,255,255,.66);
    --shadow:0 18px 48px -22px rgba(15,23,42,.35);
    --grad-hero:linear-gradient(135deg,#38bdf8 0%,#818cf8 48%,#e879f9 100%);
  }
  body{color:var(--fg)}
  h1,h2,h3,h4{color:var(--fg)}
  p,ul,ol,li,td,th{color:var(--fg)}
  .meta,.breadcrumb,.breadcrumb a,footer,footer a{color:var(--muted)}
  header{background:rgba(255,255,255,.82)}
  .hero h1{color:#fff}
  .hero p{color:#f1f9ff}
  th{background:rgba(241,245,249,.9);color:#0369a1}
}

*,
*::before,
*::after{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",Roboto,sans-serif;
  background:
    radial-gradient(1200px 600px at 10% -10%,rgba(56,189,248,.18),transparent 60%),
    radial-gradient(900px 520px at 92% 0%,rgba(168,85,247,.16),transparent 62%),
    var(--bg);
  color:var(--fg);
  line-height:1.8;
  min-height:100vh;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

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}
a:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:4px}

header{
  position:sticky;
  top:0;
  z-index:100;
  background:var(--glass);
  -webkit-backdrop-filter:blur(16px) saturate(160%);
  backdrop-filter:blur(16px) saturate(160%);
  border-bottom:1px solid var(--line);
  box-shadow:0 8px 30px -22px rgba(2,6,23,.9);
}

nav[aria-label="主导航"]{max-width:1180px;margin:0 auto;padding:0 20px}

nav ul{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  list-style:none;
  padding:10px 0;
  margin:0;
  align-items:center;
}

nav li{list-style:none}

nav a{
  display:inline-block;
  color:var(--fg);
  font-size:14px;
  padding:6px 12px;
  border-radius:999px;
  position:relative;
  transition:background .3s var(--ease),color .3s var(--ease),transform .3s var(--ease);
}
nav a::after{
  content:"";
  position:absolute;
  left:50%;
  bottom:2px;
  width:0;
  height:2px;
  background:var(--grad-line);
  border-radius:2px;
  transform:translateX(-50%);
  transition:width .3s var(--ease);
}
nav a:hover{
  color:var(--brand);
  background:rgba(56,189,248,.12);
  transform:translateY(-1px);
}
nav a:hover::after{width:60%}

main{
  max-width:1180px;
  margin:0 auto;
  padding:28px 20px 40px;
}

section{
  margin-bottom:52px;
  animation:rise .7s var(--ease) both;
}

section:nth-of-type(2n){animation-delay:.06s}
section:nth-of-type(3n){animation-delay:.12s}

@keyframes rise{
  from{opacity:0;transform:translateY(22px)}
  to{opacity:1;transform:translateY(0)}
}

@supports (animation-timeline: view()){
  section{
    animation:rise .8s var(--ease) both;
    animation-timeline:view();
    animation-range:entry 0% entry 28%;
  }
}

h1{
  font-size:clamp(24px,3.4vw,34px);
  line-height:1.35;
  margin-bottom:16px;
  letter-spacing:.2px;
  font-weight:800;
}

h2{
  font-size:clamp(20px,2.6vw,26px);
  margin:8px 0 18px;
  padding-left:14px;
  position:relative;
  font-weight:800;
  letter-spacing:.2px;
}
h2::before{
  content:"";
  position:absolute;
  left:0;
  top:.18em;
  bottom:.18em;
  width:4px;
  border-radius:4px;
  background:var(--grad-line);
  box-shadow:0 0 14px rgba(56,189,248,.55);
}

h3{
  font-size:clamp(16px,1.8vw,18px);
  margin:18px 0 10px;
  color:var(--brand);
  font-weight:700;
}

h4{
  font-size:16px;
  margin:14px 0 8px;
  color:var(--muted);
  font-weight:700;
}

p{margin-bottom:12px;color:var(--fg);opacity:.92}

ul,ol{margin:0 0 16px 22px}
li{margin-bottom:6px}

strong{color:var(--brand);font-weight:700}

.card{
  background:var(--card);
  -webkit-backdrop-filter:blur(12px) saturate(150%);
  backdrop-filter:blur(12px) saturate(150%);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:20px;
  margin-bottom:16px;
  box-shadow:var(--shadow);
  transition:transform .35s var(--ease),border-color .35s var(--ease),box-shadow .35s var(--ease),background .35s var(--ease);
  position:relative;
  overflow:hidden;
}
.card::before{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(120deg,rgba(56,189,248,.10),transparent 42%,rgba(168,85,247,.10));
  opacity:0;
  transition:opacity .35s var(--ease);
  pointer-events:none;
}
.card:hover{
  transform:translateY(-4px);
  border-color:rgba(56,189,248,.55);
  box-shadow:0 26px 60px -24px rgba(56,189,248,.45);
}
.card:hover::before{opacity:1}
.card > *{position:relative;z-index:1}

.grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
  gap:18px;
}
.grid .card{margin-bottom:0}

.badge{
  display:inline-block;
  background:var(--grad-line);
  color:#fff;
  font-size:12px;
  font-weight:700;
  letter-spacing:.4px;
  padding:3px 12px;
  border-radius:999px;
  margin-right:8px;
  box-shadow:0 6px 18px -8px rgba(56,189,248,.9);
}

.meta{
  font-size:13px;
  color:var(--muted);
  margin-bottom:10px;
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:6px;
}

.breadcrumb{
  font-size:13px;
  color:var(--muted);
  margin-bottom:18px;
  padding:8px 14px;
  border:1px solid var(--line);
  border-radius:999px;
  display:inline-block;
  background:var(--glass);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--brand)}

.hero{
  position:relative;
  background:var(--grad-hero);
  background-size:200% 200%;
  border-radius:22px;
  padding:clamp(24px,4vw,44px);
  margin-bottom:40px;
  overflow:hidden;
  box-shadow:0 30px 70px -30px rgba(99,102,241,.75);
  animation:heroShift 14s ease-in-out infinite;
}
@keyframes heroShift{
  0%,100%{background-position:0% 50%}
  50%{background-position:100% 50%}
}
.hero::before{
  content:"";
  position:absolute;
  inset:0;
  background:
    radial-gradient(600px 300px at 88% 12%,rgba(255,255,255,.24),transparent 60%),
    radial-gradient(500px 260px at 6% 96%,rgba(255,255,255,.16),transparent 62%);
  pointer-events:none;
}
.hero::after{
  content:"";
  position:absolute;
  width:340px;
  height:340px;
  right:-90px;
  top:-120px;
  border-radius:50%;
  border:1px solid rgba(255,255,255,.28);
  box-shadow:0 0 0 40px rgba(255,255,255,.06),0 0 0 90px rgba(255,255,255,.04);
  pointer-events:none;
}
.hero h1{
  color:#fff;
  text-shadow:0 6px 24px rgba(2,6,23,.35);
  position:relative;
  z-index:1;
}
.hero p{
  color:rgba(255,255,255,.94);
  position:relative;
  z-index:1;
  max-width:78ch;
}
.hero p:last-child{margin-bottom:0}

table{
  width:100%;
  border-collapse:separate;
  border-spacing:0;
  margin-bottom:18px;
  font-size:14px;
  border:1px solid var(--line);
  border-radius:var(--radius-sm);
  overflow:hidden;
  background:var(--card);
}
th,td{
  border-bottom:1px solid var(--line);
  padding:10px 12px;
  text-align:left;
  color:var(--fg);
}
th{
  background:rgba(11,18,32,.85);
  color:var(--brand);
  font-weight:700;
}
tr:last-child td{border-bottom:none}
tbody tr{transition:background .25s var(--ease)}
tbody tr:hover{background:rgba(56,189,248,.08)}

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

article.card h3{margin-top:4px}
article.card a{
  display:inline-block;
  font-size:14px;
  font-weight:600;
  padding:4px 14px;
  border-radius:999px;
  border:1px solid rgba(56,189,248,.45);
  background:rgba(56,189,248,.10);
  transition:all .3s var(--ease);
}
article.card a:hover{
  background:var(--grad-line);
  color:#fff;
  border-color:transparent;
  transform:translateX(3px);
  box-shadow:0 10px 24px -12px rgba(56,189,248,.9);
}

#faq h3{
  color:var(--fg);
  background:var(--card);
  border:1px solid var(--line);
  border-left:4px solid var(--brand);
  border-radius:var(--radius-sm);
  padding:12px 16px;
  margin:14px 0 8px;
  transition:border-color .3s var(--ease),transform .3s var(--ease),background .3s var(--ease);
}
#faq h3:hover{
  transform:translateX(4px);
  border-left-color:var(--brand-2);
  background:rgba(56,189,248,.08);
}
#faq p{
  padding:0 4px 6px 18px;
  border-left:1px dashed var(--line);
  margin-left:6px;
  margin-bottom:16px;
}

#howto ol li,
#howto ul li{transition:transform .25s var(--ease),color .25s var(--ease)}
#howto ol li:hover,
#howto ul li:hover{transform:translateX(4px);color:var(--brand)}

#contact .card h3:first-child{margin-top:0}
#contact .card p{margin-bottom:8px;word-break:break-word}

#sitemap ul,
#links ul{
  list-style:none;
  margin:0;
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
  gap:10px;
}
#sitemap li,
#links li{margin:0}
#sitemap a,
#links a{
  display:block;
  padding:10px 14px;
  border:1px solid var(--line);
  border-radius:var(--radius-sm);
  background:var(--card);
  color:var(--fg);
  font-size:14px;
  transition:all .3s var(--ease);
}
#sitemap a:hover,
#links a:hover{
  color:#fff;
  background:var(--grad-line);
  border-color:transparent;
  transform:translateY(-3px);
  box-shadow:0 16px 32px -18px rgba(99,102,241,.9);
}

#legal h3{margin-top:16px}

footer{
  border-top:1px solid var(--line);
  padding:36px 20px;
  color:var(--muted);
  font-size:13px;
  background:var(--glass);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  margin-top:20px;
}
footer .inner{
  max-width:1180px;
  margin:0 auto;
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:26px;
}
footer h4{color:var(--fg);margin-top:0}
footer p{margin-bottom:6px;color:var(--muted);opacity:1}
footer a{color:var(--muted);transition:color .25s var(--ease)}
footer a:hover{color:var(--brand)}

::selection{background:rgba(56,189,248,.35);color:#fff}

::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--bg-soft)}
::-webkit-scrollbar-thumb{
  background:linear-gradient(180deg,var(--brand),var(--brand-2));
  border-radius:999px;
  border:2px solid var(--bg-soft);
}
::-webkit-scrollbar-thumb:hover{background:var(--brand-2)}

@media (max-width:900px){
  nav ul{gap:4px;padding:8px 0}
  nav a{font-size:13px;padding:5px 10px}
  main{padding:22px 16px 32px}
  section{margin-bottom:42px}
  .hero{border-radius:18px}
}

@media (max-width:640px){
  body{line-height:1.75}
  nav ul{
    flex-wrap:nowrap;
    overflow-x:auto;
    -webkit-overflow-scrolling:touch;
    scrollbar-width:none;
  }
  nav ul::-webkit-scrollbar{display:none}
  nav a{white-space:nowrap}
  main{padding:18px 14px 28px}
  section{margin-bottom:36px}
  .hero{padding:22px 18px}
  .hero::after{display:none}
  .grid{grid-template-columns:1fr;gap:14px}
  .card{padding:16px;border-radius:14px}
  h2{padding-left:12px}
  h2::before{width:3px}
  #sitemap ul,#links ul{grid-template-columns:1fr 1fr}
  footer{padding:28px 16px}
  footer .inner{gap:20px}
  table{display:block;overflow-x:auto;white-space:nowrap}
}

@media (max-width:380px){
  #sitemap ul,#links ul{grid-template-columns:1fr}
  .breadcrumb{font-size:12px;padding:6px 12px}
}

@media (prefers-reduced-motion:reduce){
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
}

@media print{
  header,footer,.breadcrumb,.hero::after{display:none}
  body{background:#fff;color:#000}
  .card{box-shadow:none;border:1px solid #ccc;background:#fff}
  a{color:#000;text-decoration:underline}
}