:root{
  --bg-primary:#0f172a;
  --bg-secondary:#1e293b;
  --bg-tertiary:#334155;
  --bg-card:rgba(30,41,59,.65);
  --bg-glass:rgba(255,255,255,.06);
  --bg-glass-hover:rgba(255,255,255,.12);
  --text-primary:#f1f5f9;
  --text-secondary:#cbd5e1;
  --text-muted:#94a3b8;
  --accent-1:#6366f1;
  --accent-2:#8b5cf6;
  --accent-3:#ec4899;
  --accent-4:#06b6d4;
  --gradient-banner:linear-gradient(135deg,#1e1b4b 0%,#312e81 25%,#4c1d95 50%,#831843 75%,#1e1b4b 100%);
  --gradient-btn:linear-gradient(135deg,#6366f1,#8b5cf6);
  --gradient-btn-hover:linear-gradient(135deg,#818cf8,#a78bfa);
  --gradient-accent:linear-gradient(135deg,#6366f1,#ec4899,#06b6d4);
  --border-color:rgba(148,163,184,.15);
  --border-glass:rgba(255,255,255,.1);
  --shadow-sm:0 2px 8px rgba(0,0,0,.25);
  --shadow-md:0 8px 24px rgba(0,0,0,.35);
  --shadow-lg:0 16px 48px rgba(0,0,0,.45);
  --shadow-glow:0 0 24px rgba(99,102,241,.3);
  --radius-sm:8px;
  --radius-md:14px;
  --radius-lg:20px;
  --radius-xl:28px;
  --transition-fast:.2s cubic-bezier(.4,0,.2,1);
  --transition-base:.35s cubic-bezier(.4,0,.2,1);
  --transition-slow:.5s cubic-bezier(.4,0,.2,1);
  --font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  --max-width:1200px;
  --header-height:auto;
}

@media (prefers-color-scheme:light){
  :root{
    --bg-primary:#f8fafc;
    --bg-secondary:#f1f5f9;
    --bg-tertiary:#e2e8f0;
    --bg-card:rgba(255,255,255,.75);
    --bg-glass:rgba(255,255,255,.6);
    --bg-glass-hover:rgba(255,255,255,.85);
    --text-primary:#0f172a;
    --text-secondary:#334155;
    --text-muted:#64748b;
    --border-color:rgba(15,23,42,.1);
    --border-glass:rgba(15,23,42,.08);
    --shadow-sm:0 2px 8px rgba(15,23,42,.08);
    --shadow-md:0 8px 24px rgba(15,23,42,.1);
    --shadow-lg:0 16px 48px rgba(15,23,42,.14);
    --shadow-glow:0 0 24px rgba(99,102,241,.18);
    --gradient-banner:linear-gradient(135deg,#e0e7ff 0%,#ede9fe 25%,#fce7f3 50%,#fae8ff 75%,#e0e7ff 100%);
  }
}

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

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

body{
  font-family:var(--font-family);
  background-color:var(--bg-primary);
  color:var(--text-primary);
  line-height:1.75;
  font-size:16px;
  overflow-x:hidden;
  transition:background-color var(--transition-slow),color var(--transition-slow);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

body::before{
  content:"";
  position:fixed;
  top:0;
  left:0;
  width:100%;
  height:100%;
  background:
    radial-gradient(ellipse 80% 50% at 20% 10%,rgba(99,102,241,.08),transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 30%,rgba(236,72,153,.06),transparent 60%),
    radial-gradient(ellipse 70% 50% at 50% 90%,rgba(6,182,212,.06),transparent 60%);
  pointer-events:none;
  z-index:0;
  transition:opacity var(--transition-slow);
}

@media (prefers-color-scheme:light){
  body::before{
    background:
      radial-gradient(ellipse 80% 50% at 20% 10%,rgba(99,102,241,.06),transparent 60%),
      radial-gradient(ellipse 60% 40% at 80% 30%,rgba(236,72,153,.04),transparent 60%),
      radial-gradient(ellipse 70% 50% at 50% 90%,rgba(6,182,212,.04),transparent 60%);
  }
}

::selection{
  background:rgba(99,102,241,.35);
  color:var(--text-primary);
}

::-webkit-scrollbar{
  width:8px;
  height:8px;
}

::-webkit-scrollbar-track{
  background:var(--bg-primary);
}

::-webkit-scrollbar-thumb{
  background:var(--bg-tertiary);
  border-radius:4px;
  transition:background var(--transition-fast);
}

::-webkit-scrollbar-thumb:hover{
  background:var(--accent-1);
}

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

a{
  color:var(--accent-1);
  text-decoration:none;
  transition:color var(--transition-fast),opacity var(--transition-fast);
}

a:hover{
  color:var(--accent-2);
}

a:focus-visible{
  outline:2px solid var(--accent-1);
  outline-offset:3px;
  border-radius:4px;
}

ul,ol{
  list-style:none;
}

header{
  position:relative;
  background:var(--gradient-banner);
  background-size:300% 300%;
  animation:gradientShift 12s ease infinite;
  padding:80px 24px 60px;
  text-align:center;
  overflow:hidden;
  z-index:1;
}

header::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  bottom:0;
  background:
    radial-gradient(circle at 20% 40%,rgba(99,102,241,.25),transparent 50%),
    radial-gradient(circle at 80% 60%,rgba(236,72,153,.2),transparent 50%),
    radial-gradient(circle at 50% 80%,rgba(6,182,212,.15),transparent 50%);
  pointer-events:none;
}

header::after{
  content:"";
  position:absolute;
  bottom:-1px;
  left:0;
  right:0;
  height:80px;
  background:linear-gradient(to top,var(--bg-primary),transparent);
  pointer-events:none;
  z-index:1;
}

@keyframes gradientShift{
  0%{background-position:0% 50%;}
  50%{background-position:100% 50%;}
  100%{background-position:0% 50%;}
}

header h1{
  position:relative;
  z-index:2;
  font-size:clamp(1.6rem,4.5vw,2.8rem);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.3;
  color:#fff;
  text-shadow:0 2px 20px rgba(0,0,0,.3);
  margin-bottom:20px;
  animation:fadeInUp .8s ease both;
}

@media (prefers-color-scheme:light){
  header h1{
    color:#1e1b4b;
    text-shadow:0 2px 20px rgba(255,255,255,.5);
  }
}

header > p{
  position:relative;
  z-index:2;
  max-width:800px;
  margin:0 auto 36px;
  font-size:clamp(.9rem,2vw,1.05rem);
  line-height:1.85;
  color:rgba(255,255,255,.85);
  animation:fadeInUp .8s ease .15s both;
}

@media (prefers-color-scheme:light){
  header > p{
    color:#334155;
  }
}

@keyframes fadeInUp{
  from{
    opacity:0;
    transform:translateY(24px);
  }
  to{
    opacity:1;
    transform:translateY(0);
  }
}

nav[aria-label="主导航"]{
  position:relative;
  z-index:2;
  animation:fadeInUp .8s ease .3s both;
}

nav[aria-label="主导航"] ul{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:8px;
  max-width:900px;
  margin:0 auto;
}

nav[aria-label="主导航"] ul li a{
  display:inline-block;
  padding:8px 18px;
  font-size:.85rem;
  font-weight:500;
  color:rgba(255,255,255,.85);
  background:rgba(255,255,255,.1);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border:1px solid rgba(255,255,255,.15);
  border-radius:50px;
  transition:all var(--transition-base);
  white-space:nowrap;
}

nav[aria-label="主导航"] ul li a:hover{
  color:#fff;
  background:rgba(255,255,255,.22);
  border-color:rgba(255,255,255,.35);
  transform:translateY(-2px);
  box-shadow:0 8px 20px rgba(0,0,0,.2);
}

@media (prefers-color-scheme:light){
  nav[aria-label="主导航"] ul li a{
    color:#4c1d95;
    background:rgba(255,255,255,.55);
    border-color:rgba(99,102,241,.2);
  }
  nav[aria-label="主导航"] ul li a:hover{
    color:#1e1b4b;
    background:rgba(255,255,255,.85);
    border-color:rgba(99,102,241,.4);
  }
}

main{
  position:relative;
  z-index:1;
  max-width:var(--max-width);
  margin:0 auto;
  padding:0 24px 80px;
}

section{
  margin-top:56px;
  padding:40px 32px;
  background:var(--bg-card);
  backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
  border:1px solid var(--border-glass);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow-sm);
  transition:box-shadow var(--transition-base),transform var(--transition-base),border-color var(--transition-base);
  animation:fadeInUp .6s ease both;
  animation-timeline:view();
  animation-range:entry 0% entry 30%;
}

@supports not (animation-timeline:view()){
  section{
    animation:fadeInUp .6s ease both;
  }
}

section:hover{
  box-shadow:var(--shadow-md);
  border-color:rgba(99,102,241,.2);
}

section h2{
  font-size:clamp(1.25rem,3vw,1.65rem);
  font-weight:700;
  color:var(--text-primary);
  margin-bottom:24px;
  padding-bottom:14px;
  position:relative;
  letter-spacing:-.01em;
}

section h2::after{
  content:"";
  position:absolute;
  bottom:0;
  left:0;
  width:56px;
  height:3px;
  background:var(--gradient-accent);
  border-radius:2px;
  transition:width var(--transition-base);
}

section:hover h2::after{
  width:100px;
}

section h3{
  font-size:clamp(1rem,2.2vw,1.2rem);
  font-weight:600;
  color:var(--text-primary);
  margin:28px 0 12px;
  padding-left:14px;
  position:relative;
  line-height:1.4;
}

section h3::before{
  content:"";
  position:absolute;
  left:0;
  top:4px;
  bottom:4px;
  width:4px;
  background:var(--gradient-btn);
  border-radius:2px;
  transition:transform var(--transition-base);
  transform-origin:top;
}

section h3:hover::before{
  transform:scaleY(1.15);
}

section h4{
  font-size:.95rem;
  font-weight:600;
  color:var(--accent-1);
  margin:20px 0 8px;
  padding-left:12px;
  position:relative;
}

section h4::before{
  content:"▸";
  position:absolute;
  left:0;
  color:var(--accent-2);
  font-size:.8rem;
}

section p{
  color:var(--text-secondary);
  font-size:.95rem;
  line-height:1.9;
  margin-bottom:14px;
  text-align:justify;
}

section p:last-child{
  margin-bottom:0;
}

section ul{
  padding-left:0;
}

section ul li{
  color:var(--text-secondary);
  font-size:.95rem;
  padding:8px 0 8px 24px;
  position:relative;
  line-height:1.7;
  border-bottom:1px solid var(--border-color);
  transition:background var(--transition-fast),padding-left var(--transition-fast);
}

section ul li:last-child{
  border-bottom:none;
}

section ul li::before{
  content:"";
  position:absolute;
  left:4px;
  top:50%;
  transform:translateY(-50%);
  width:8px;
  height:8px;
  background:var(--gradient-btn);
  border-radius:50%;
  transition:transform var(--transition-fast),box-shadow var(--transition-fast);
}

section ul li:hover{
  background:var(--bg-glass);
  padding-left:30px;
  border-radius:var(--radius-sm);
}

section ul li:hover::before{
  transform:translateY(-50%) scale(1.3);
  box-shadow:0 0 10px rgba(99,102,241,.5);
}

section ul li a{
  color:var(--accent-1);
  font-weight:500;
  transition:color var(--transition-fast);
}

section ul li a:hover{
  color:var(--accent-3);
}

article{
  background:var(--bg-glass);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border:1px solid var(--border-glass);
  border-radius:var(--radius-md);
  padding:24px 28px;
  margin-bottom:20px;
  transition:all var(--transition-base);
  position:relative;
  overflow:hidden;
}

article::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  width:4px;
  height:100%;
  background:var(--gradient-btn);
  opacity:0;
  transition:opacity var(--transition-base);
}

article:hover{
  background:var(--bg-glass-hover);
  border-color:rgba(99,102,241,.25);
  transform:translateX(4px);
  box-shadow:var(--shadow-md);
}

article:hover::before{
  opacity:1;
}

article h3{
  margin-top:0;
  margin-bottom:10px;
  font-size:1.05rem;
}

article h3::before{
  display:none;
}

article h3 + p{
  font-size:.82rem;
  color:var(--text-muted);
  margin-bottom:10px;
  font-weight:500;
  letter-spacing:.02em;
}

article p{
  font-size:.92rem;
  margin-bottom:10px;
}

article p a{
  display:inline-flex;
  align-items:center;
  gap:4px;
  font-size:.85rem;
  font-weight:600;
  color:var(--accent-1);
  padding:4px 0;
  transition:all var(--transition-fast);
}

article p a::after{
  content:"→";
  transition:transform var(--transition-fast);
}

article p a:hover{
  color:var(--accent-3);
}

article p a:hover::after{
  transform:translateX(4px);
}

#reviews p{
  background:var(--bg-glass);
  border-left:3px solid var(--accent-2);
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  padding:16px 20px;
  margin-bottom:12px;
  font-style:italic;
  font-size:.92rem;
  color:var(--text-secondary);
  transition:all var(--transition-base);
}

#reviews p:hover{
  background:var(--bg-glass-hover);
  border-left-color:var(--accent-3);
  transform:translateX(6px);
  box-shadow:var(--shadow-sm);
}

#faq h3{
  cursor:default;
  padding:16px 20px 8px;
  margin:20px 0 0;
  background:var(--bg-glass);
  border-radius:var(--radius-sm) var(--radius-sm) 0 0;
  border:1px solid var(--border-glass);
  border-bottom:none;
  font-size:.95rem;
  color:var(--accent-1);
  transition:all var(--transition-base);
}

#faq h3::before{
  display:none;
}

#faq h3:hover{
  background:var(--bg-glass-hover);
  color:var(--accent-2);
}

#faq h3 + p{
  padding:8px 20px 16px;
  margin:-1px 0 0;
  background:var(--bg-glass);
  border-radius:0 0 var(--radius-sm) var(--radius-sm);
  border:1px solid var(--border-glass);
  border-top:none;
  font-size:.9rem;
  transition:all var(--transition-base);
}

#faq h3 + p:hover{
  background:var(--bg-glass-hover);
}

#howto h4{
  color:var(--accent-4);
  font-size:.95rem;
  margin:22px 0 8px;
}

#howto h4::before{
  content:"◆";
  color:var(--accent-4);
  font-size:.7rem;
}

#contact p{
  display:flex;
  align-items:baseline;
  gap:8px;
  padding:10px 16px;
  margin-bottom:8px;
  background:var(--bg-glass);
  border-radius:var(--radius-sm);
  border:1px solid var(--border-glass);
  font-size:.92rem;
  transition:all var(--transition-base);
}

#contact p:hover{
  background:var(--bg-glass-hover);
  border-color:rgba(99,102,241,.25);
  transform:translateX(4px);
}

#sitemap ul{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(160px,1fr));
  gap:8px;
}

#sitemap ul li{
  border-bottom:none;
  padding:10px 16px;
  background:var(--bg-glass);
  border-radius:var(--radius-sm);
  border:1px solid var(--border-glass);
  text-align:center;
  transition:all var(--transition-base);
}

#sitemap ul li::before{
  display:none;
}

#sitemap ul li:hover{
  background:var(--bg-glass-hover);
  border-color:rgba(99,102,241,.3);
  transform:translateY(-2px);
  box-shadow:var(--shadow-sm);
}

#sitemap ul li a{
  font-weight:500;
  font-size:.88rem;
}

#links ul{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(180px,1fr));
  gap:8px;
}

#links ul li{
  border-bottom:none;
  padding:10px 16px;
  background:var(--bg-glass);
  border-radius:var(--radius-sm);
  border:1px solid var(--border-glass);
  text-align:center;
  transition:all var(--transition-base);
}

#links ul li::before{
  display:none;
}

#links ul li:hover{
  background:var(--bg-glass-hover);
  border-color:rgba(6,182,212,.3);
  transform:translateY(-2px);
  box-shadow:var(--shadow-sm);
}

#links ul li a{
  font-weight:500;
  font-size:.88rem;
}

#legal h3{
  color:var(--accent-3);
}

#legal h3::before{
  background:linear-gradient(135deg,#ec4899,#f43f5e);
}

#author p{
  display:flex;
  flex-wrap:wrap;
  gap:6px 16px;
  padding:8px 0;
  font-size:.9rem;
  border-bottom:1px dashed var(--border-color);
}

#author p:last-child{
  border-bottom:none;
}

footer{
  position:relative;
  z-index:1;
  text-align:center;
  padding:48px 24px;
  margin-top:40px;
  background:var(--bg-secondary);
  border-top:1px solid var(--border-color);
}

footer::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:1px;
  background:var(--gradient-accent);
  opacity:.5;
}

footer p{
  font-size:.85rem;
  color:var(--text-muted);
  line-height:1.8;
  margin-bottom:4px;
}

footer p:last-child{
  margin-bottom:0;
}

@media (max-width:768px){
  header{
    padding:56px 18px 44px;
  }

  header h1{
    font-size:1.45rem;
  }

  header > p{
    font-size:.88rem;
    margin-bottom:28px;
  }

  nav[aria-label="主导航"] ul{
    gap:6px;
  }

  nav[aria-label="主导航"] ul li a{
    padding:6px 14px;
    font-size:.78rem;
  }

  main{
    padding:0 14px 60px;
  }

  section{
    padding:28px 18px;
    margin-top:36px;
    border-radius:var(--radius-md);
  }

  section h2{
    font-size:1.2rem;
    margin-bottom:18px;
  }

  section h3{
    font-size:.98rem;
    margin:22px 0 10px;
  }

  section p{
    font-size:.9rem;
    line-height:1.8;
  }

  article{
    padding:18px 20px;
  }

  #sitemap ul{
    grid-template-columns:repeat(auto-fill,minmax(130px,1fr));
  }

  #links ul{
    grid-template-columns:repeat(auto-fill,minmax(140px,1fr));
  }
}

@media (max-width:480px){
  header{
    padding:44px 14px 36px;
  }

  header h1{
    font-size:1.25rem;
  }

  header > p{
    font-size:.82rem;
  }

  nav[aria-label="主导航"] ul li a{
    padding:5px 11px;
    font-size:.72rem;
  }

  main{
    padding:0 10px 48px;
  }

  section{
    padding:22px 14px;
    margin-top:28px;
  }

  section h2{
    font-size:1.1rem;
  }

  #sitemap ul{
    grid-template-columns:1fr 1fr;
  }

  #links ul{
    grid-template-columns:1fr 1fr;
  }

  footer{
    padding:36px 16px;
  }
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.01ms!important;
    animation-iteration-count:1!important;
    transition-duration:.01ms!important;
    scroll-behavior:auto!important;
  }
}

@media print{
  body::before,
  header::before,
  header::after,
  footer::before{
    display:none;
  }

  header{
    background:#fff;
    color:#000;
  }

  section{
    box-shadow:none;
    border:1px solid #ccc;
    break-inside:avoid;
  }

  a{
    color:#000;
    text-decoration:underline;
  }
}