:root{
  --bg:#f4f6fb;
  --bg-soft:#ffffff;
  --bg-elev:#ffffff;
  --text:#1b1f3b;
  --text-soft:#4a5070;
  --text-mute:#7a819c;
  --brand:#1b1f3b;
  --brand-2:#2a2f55;
  --accent:#ffd166;
  --accent-2:#8ecae6;
  --accent-3:#c77dff;
  --line:rgba(27,31,59,.12);
  --glass:rgba(255,255,255,.62);
  --glass-border:rgba(255,255,255,.7);
  --shadow:0 10px 30px rgba(27,31,59,.10);
  --shadow-lg:0 20px 50px rgba(27,31,59,.16);
  --radius:18px;
  --radius-sm:12px;
  --radius-lg:26px;
  --maxw:1120px;
  --header-h:72px;
  --grad-banner:linear-gradient(135deg,#1b1f3b 0%,#2a2f55 45%,#3b2f6b 100%);
  --grad-accent:linear-gradient(120deg,#ffd166 0%,#8ecae6 100%);
  --ease:cubic-bezier(.22,.61,.36,1);
}

html[data-theme="dark"]{
  --bg:#0e1124;
  --bg-soft:#161a35;
  --bg-elev:#1a1f3d;
  --text:#eef1ff;
  --text-soft:#c3c9e6;
  --text-mute:#8d94b8;
  --brand:#eef1ff;
  --brand-2:#c3c9e6;
  --line:rgba(255,255,255,.14);
  --glass:rgba(26,31,61,.55);
  --glass-border:rgba(255,255,255,.12);
  --shadow:0 10px 30px rgba(0,0,0,.45);
  --shadow-lg:0 20px 50px rgba(0,0,0,.6);
  --grad-banner:linear-gradient(135deg,#0e1124 0%,#1b1f3b 45%,#2b2350 100%);
}

*,*::before,*::after{box-sizing:border-box}

html{
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 16px);
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  font-size:16px;
  line-height:1.85;
  color:var(--text);
  background:var(--bg);
  background-image:
    radial-gradient(900px 500px at 10% -10%,rgba(199,125,255,.10),transparent 60%),
    radial-gradient(900px 500px at 100% 0%,rgba(142,202,230,.12),transparent 60%);
  background-attachment:fixed;
  transition:background-color .35s var(--ease),color .35s var(--ease);
  overflow-x:hidden;
}

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

a{
  color:#3b6fd4;
  text-decoration:none;
  transition:color .25s var(--ease),opacity .25s var(--ease);
}
html[data-theme="dark"] a{color:#8ecae6}
a:hover{color:var(--accent);text-decoration:underline;text-underline-offset:3px}

h1,h2,h3,h4{
  line-height:1.35;
  margin:0 0 .6em;
  letter-spacing:.01em;
  font-weight:800;
}
h1{font-size:clamp(1.7rem,4vw,2.6rem)}
h2{font-size:clamp(1.4rem,2.8vw,1.9rem)}
h3{font-size:clamp(1.12rem,2vw,1.3rem)}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.4em}
li{margin:.35em 0}

::selection{background:var(--accent);color:#1b1f3b}

:focus-visible{
  outline:3px solid var(--accent-2);
  outline-offset:3px;
  border-radius:6px;
}

/* ---------- Header ---------- */
#site-header{
  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(--glass-border);
  box-shadow:0 4px 24px rgba(27,31,59,.06);
  transition:background-color .35s var(--ease),box-shadow .35s var(--ease);
}
.header-inner{
  max-width:var(--maxw);
  margin:0 auto;
  padding:10px 20px;
  min-height:var(--header-h);
  display:flex;
  align-items:center;
  gap:16px;
  flex-wrap:wrap;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  color:var(--text);
  font-weight:800;
  text-decoration:none;
  flex-shrink:0;
}
.brand:hover{text-decoration:none;color:var(--text)}
.brand svg{
  border-radius:12px;
  box-shadow:0 6px 18px rgba(27,31,59,.28);
  transition:transform .4s var(--ease),box-shadow .4s var(--ease);
}
.brand:hover svg{transform:rotate(-6deg) scale(1.06);box-shadow:0 10px 26px rgba(255,209,102,.4)}
.brand-name{
  font-size:1.15rem;
  letter-spacing:.06em;
  background:var(--grad-accent);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  -webkit-text-fill-color:transparent;
}

#site-header nav{flex:1 1 auto;min-width:0}
#site-header nav ul{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  gap:4px;
}
#site-header nav a{
  display:inline-block;
  padding:6px 11px;
  border-radius:999px;
  font-size:.92rem;
  color:var(--text-soft);
  text-decoration:none;
  transition:background-color .25s var(--ease),color .25s var(--ease),transform .25s var(--ease);
}
#site-header nav a:hover{
  background:rgba(142,202,230,.18);
  color:var(--text);
  transform:translateY(-1px);
  text-decoration:none;
}

#site-header form[role="search"]{
  display:flex;
  align-items:center;
  gap:6px;
  flex:0 1 320px;
  margin-left:auto;
}
#site-header form[role="search"] label{
  position:absolute;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;
  clip:rect(0 0 0 0);
  white-space:nowrap;border:0;
}
#site-header input[type="search"]{
  flex:1 1 auto;
  min-width:0;
  padding:8px 14px;
  font-size:.9rem;
  color:var(--text);
  background:var(--bg-soft);
  border:1px solid var(--line);
  border-radius:999px;
  transition:border-color .25s var(--ease),box-shadow .25s var(--ease);
}
#site-header input[type="search"]::placeholder{color:var(--text-mute)}
#site-header input[type="search"]:focus{
  outline:none;
  border-color:var(--accent-2);
  box-shadow:0 0 0 3px rgba(142,202,230,.28);
}
#site-header button[type="submit"],
#theme-toggle{
  cursor:pointer;
  border:none;
  font-family:inherit;
  font-size:.88rem;
  font-weight:700;
  padding:8px 16px;
  border-radius:999px;
  color:#1b1f3b;
  background:var(--grad-accent);
  box-shadow:0 6px 16px rgba(255,209,102,.35);
  transition:transform .25s var(--ease),box-shadow .25s var(--ease),filter .25s var(--ease);
  white-space:nowrap;
}
#theme-toggle{
  color:var(--text);
  background:var(--bg-soft);
  border:1px solid var(--line);
  box-shadow:none;
}
#site-header button[type="submit"]:hover,
#theme-toggle:hover{
  transform:translateY(-2px);
  filter:brightness(1.05);
  box-shadow:0 10px 22px rgba(255,209,102,.45);
}
#theme-toggle:hover{box-shadow:0 8px 20px rgba(142,202,230,.35)}

/* ---------- Main & sections ---------- */
main{
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 20px 80px;
}

section{
  margin:40px 0;
  padding:28px clamp(18px,3vw,36px);
  background:var(--bg-soft);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow);
  transition:background-color .35s var(--ease),border-color .35s var(--ease),box-shadow .35s var(--ease);
}

section > h2{
  position:relative;
  padding-bottom:.5em;
  margin-bottom:1em;
}
section > h2::after{
  content:"";
  position:absolute;
  left:0;bottom:0;
  width:64px;height:4px;
  border-radius:999px;
  background:var(--grad-accent);
}

/* Hero */
#hero{
  margin-top:32px;
  padding:clamp(28px,5vw,56px);
  background:var(--grad-banner);
  color:#eef1ff;
  border:none;
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow-lg);
  position:relative;
  overflow:hidden;
  isolation:isolate;
}
#hero::before{
  content:"";
  position:absolute;
  inset:-40% -10% auto auto;
  width:520px;height:520px;
  background:radial-gradient(circle at center,rgba(255,209,102,.35),transparent 65%);
  filter:blur(10px);
  z-index:-1;
  animation:floatGlow 12s ease-in-out infinite alternate;
}
#hero::after{
  content:"";
  position:absolute;
  inset:auto auto -30% -10%;
  width:460px;height:460px;
  background:radial-gradient(circle at center,rgba(142,202,230,.32),transparent 65%);
  filter:blur(12px);
  z-index:-1;
  animation:floatGlow 14s ease-in-out infinite alternate-reverse;
}
@keyframes floatGlow{
  from{transform:translate3d(0,0,0) scale(1)}
  to{transform:translate3d(-30px,20px,0) scale(1.12)}
}
#hero h1{color:#fff}
#hero p{color:rgba(238,241,255,.9);max-width:78ch}
#hero a{color:var(--accent);font-weight:700}
#hero a:hover{color:#fff}

#hero figure{
  margin:24px 0;
  padding:12px;
  border-radius:var(--radius);
  background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.18);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  box-shadow:0 18px 40px rgba(0,0,0,.25);
  transition:transform .45s var(--ease);
}
#hero figure:hover{transform:translateY(-4px)}
#hero figure svg{border-radius:14px}
#hero figcaption{
  margin-top:10px;
  font-size:.86rem;
  color:rgba(238,241,255,.72);
  text-align:center;
}

/* Breadcrumb & anchors */
nav[aria-label="面包屑导航"] ol{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  padding:0;
  margin:22px 0 0;
  font-size:.88rem;
  color:var(--text-mute);
}
nav[aria-label="面包屑导航"] li+li::before{
  content:"/";
  margin-right:8px;
  color:var(--text-mute);
}
nav[aria-label="面包屑导航"] [aria-current="page"]{color:var(--text-soft);font-weight:600}

nav[aria-label="页面锚点导航"]{
  margin:26px 0;
  padding:20px 24px;
  border-radius:var(--radius);
  background:var(--glass);
  border:1px solid var(--glass-border);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  box-shadow:var(--shadow);
}
nav[aria-label="页面锚点导航"] h2{
  font-size:1rem;
  margin:0 0 .7em;
  color:var(--text-mute);
  letter-spacing:.08em;
}
nav[aria-label="页面锚点导航"] ul{
  list-style:none;
  margin:0;padding:0;
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}
nav[aria-label="页面锚点导航"] a{
  display:inline-block;
  padding:5px 13px;
  font-size:.86rem;
  border-radius:999px;
  background:rgba(142,202,230,.16);
  color:var(--text-soft);
  text-decoration:none;
  border:1px solid transparent;
  transition:all .25s var(--ease);
}
nav[aria-label="页面锚点导航"] a:hover{
  background:var(--accent);
  color:#1b1f3b;
  border-color:var(--accent);
  transform:translateY(-2px);
  text-decoration:none;
  box-shadow:0 8px 18px rgba(255,209,102,.35);
}

/* Figures */
figure{
  margin:24px 0;
  padding:14px;
  background:var(--bg);
  border:1px solid var(--line);
  border-radius:var(--radius);
  transition:transform .4s var(--ease),box-shadow .4s var(--ease);
}
figure:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
figure svg{border-radius:12px}
figcaption{
  margin-top:10px;
  font-size:.85rem;
  color:var(--text-mute);
  text-align:center;
}

/* Definition lists */
dl{
  margin:20px 0;
  display:grid;
  grid-template-columns:max-content 1fr;
  gap:10px 24px;
  padding:20px 24px;
  border-radius:var(--radius);
  background:var(--bg);
  border:1px solid var(--line);
}
dt{
  font-weight:700;
  color:var(--text-soft);
  white-space:nowrap;
}
dd{margin:0;color:var(--text)}

/* Lists in history / products */
#history ul,
#products ul,
#solutions ul,
#howto ul,
#howto ol{
  padding-left:1.2em;
}
#history li::marker,
#products li::marker,
#howto li::marker{color:var(--accent-2)}
#history strong,
#products strong{color:var(--text)}

/* Articles */
#articles article{
  margin:18px 0;
  padding:22px 24px;
  border-radius:var(--radius);
  background:var(--bg);
  border:1px solid var(--line);
  border-left:4px solid transparent;
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease),background-color .35s var(--ease);
}
#articles article:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-lg);
  border-left-color:var(--accent);
  background:var(--bg-soft);
}
#articles article h3{margin-bottom:.35em}
#articles article p:first-of-type{
  font-size:.82rem;
  color:var(--text-mute);
  margin-bottom:.6em;
}
#articles article a{
  font-weight:700;
  display:inline-flex;
  align-items:center;
  gap:6px;
}
#articles article a::after{
  content:"→";
  transition:transform .3s var(--ease);
}
#articles article a:hover::after{transform:translateX(4px)}

/* Cases quotes */
blockquote{
  margin:16px 0;
  padding:18px 22px 18px 26px;
  border-radius:var(--radius-sm);
  background:var(--bg);
  border-left:4px solid var(--accent-2);
  color:var(--text-soft);
  font-style:normal;
  position:relative;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease);
}
blockquote:hover{transform:translateX(4px);box-shadow:var(--shadow)}
blockquote p{margin:0}

/* News */
#news ul{list-style:none;padding:0}
#news li{
  padding:12px 16px;
  margin:8px 0;
  border-radius:var(--radius-sm);
  background:var(--bg);
  border:1px solid var(--line);
  transition:transform .3s var(--ease),border-color .3s var(--ease);
}
#news li:hover{transform:translateX(4px);border-color:var(--accent-2)}
#news strong{color:var(--accent-2)}

/* FAQ */
#faq h3{
  margin-top:1.6em;
  padding-left:16px;
  position:relative;
  color:var(--text);
}
#faq h3:first-of-type{margin-top:.4em}
#faq h3::before{
  content:"";
  position:absolute;
  left:0;top:.42em;
  width:6px;height:1.05em;
  border-radius:999px;
  background:var(--grad-accent);
}
#faq p{
  color:var(--text-soft);
  padding-left:16px;
}

/* HowTo */
#howto ol li,
#howto ul li{color:var(--text-soft)}
#howto h3{
  margin-top:1.5em;
  color:var(--text);
}
#howto ol{
  counter-reset:step;
  list-style:none;
  padding-left:0;
}
#howto ol li{
  counter-increment:step;
  position:relative;
  padding:10px 14px 10px 52px;
  margin:10px 0;
  border-radius:var(--radius-sm);
  background:var(--bg);
  border:1px solid var(--line);
  transition:transform .3s var(--ease),border-color .3s var(--ease);
}
#howto ol li:hover{transform:translateX(4px);border-color:var(--accent)}
#howto ol li::before{
  content:counter(step);
  position:absolute;
  left:12px;top:50%;
  transform:translateY(-50%);
  width:28px;height:28px;
  display:grid;
  place-items:center;
  border-radius:50%;
  font-size:.82rem;
  font-weight:800;
  color:#1b1f3b;
  background:var(--grad-accent);
}

/* Contact */
#contact dl{background:var(--bg)}
#contact a{word-break:break-all}

/* Sitemap & links */
#sitemap ul,
#links ul{
  list-style:none;
  padding:0;
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(220px,1fr));
  gap:8px;
}
#sitemap li,
#links li{
  margin:0;
  padding:10px 14px;
  border-radius:var(--radius-sm);
  background:var(--bg);
  border:1px solid var(--line);
  transition:transform .25s var(--ease),border-color .25s var(--ease),background-color .25s var(--ease);
}
#sitemap li:hover,
#links li:hover{
  transform:translateY(-2px);
  border-color:var(--accent-2);
  background:var(--bg-soft);
}
#sitemap a,
#links a{font-size:.92rem}

/* Footer */
footer{
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 20px 60px;
}
footer section{
  margin:20px 0;
  padding:22px 24px;
  border-radius:var(--radius);
  background:var(--bg-soft);
  border:1px solid var(--line);
  box-shadow:var(--shadow);
}
footer section h2{
  font-size:1.05rem;
  margin-bottom:.5em;
  color:var(--text-soft);
}
footer section p{
  font-size:.9rem;
  color:var(--text-mute);
  margin:0;
}
footer > p{
  margin-top:26px;
  text-align:center;
  font-size:.85rem;
  color:var(--text-mute);
  padding:16px;
  border-top:1px solid var(--line);
}

/* Back to top */
#back-to-top{
  position:fixed;
  right:22px;
  bottom:22px;
  z-index:120;
  cursor:pointer;
  border:none;
  font-family:inherit;
  font-size:.85rem;
  font-weight:700;
  padding:12px 18px;
  border-radius:999px;
  color:#1b1f3b;
  background:var(--grad-accent);
  box-shadow:0 12px 28px rgba(255,209,102,.45);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),opacity .3s var(--ease);
}
#back-to-top:hover{
  transform:translateY(-4px) scale(1.04);
  box-shadow:0 18px 36px rgba(255,209,102,.55);
}
#back-to-top:active{transform:translateY(-1px) scale(.98)}

/* Scroll animation */
@keyframes fadeUp{
  from{opacity:0;transform:translateY(26px)}
  to{opacity:1;transform:translateY(0)}
}
section,
nav[aria-label="页面锚点导航"],
#articles article,
#faq h3,
#howto ol li{
  animation:fadeUp .7s var(--ease) both;
  animation-timeline:view();
  animation-range:entry 0% cover 28%;
}

/* Fallback for browsers without scroll-driven animations */
@supports not (animation-timeline:view()){
  section,
  nav[aria-label="页面锚点导航"],
  #articles article{
    animation:none;
    opacity:1;
    transform:none;
  }
}

/* Responsive */
@media (max-width:960px){
  .header-inner{gap:12px}
  #site-header nav ul{gap:2px}
  #site-header nav a{padding:6px 9px;font-size:.86rem}
  #site-header form[role="search"]{flex:1 1 100%;order:5;margin-left:0}
}

@media (max-width:720px){
  :root{--header-h:64px}
  body{font-size:15px;line-height:1.8}
  .header-inner{padding:8px 14px}
  .brand-name{font-size:1.02rem}
  #site-header nav{
    flex:1 1 100%;
    order:4;
    overflow-x:auto;
    -webkit-overflow-scrolling:touch;
    scrollbar-width:none;
  }
  #site-header nav::-webkit-scrollbar{display:none}
  #site-header nav ul{
    flex-wrap:nowrap;
    padding-bottom:4px;
  }
  #site-header nav a{white-space:nowrap}
  #theme-toggle{order:3;margin-left:auto}
  main{padding:0 14px 60px}
  section{
    margin:26px 0;
    padding:22px 18px;
    border-radius:var(--radius);
  }
  #hero{
    margin-top:20px;
    padding:26px 20px;
    border-radius:var(--radius);
  }
  #hero figure{padding:8px}
  nav[aria-label="页面锚点导航"]{padding:16px}
  dl{
    grid-template-columns:1fr;
    gap:4px 0;
    padding:16px;
  }
  dt{margin-top:8px}
  dt:first-of-type{margin-top:0}
  #sitemap ul,
  #links ul{grid-template-columns:1fr}
  #back-to-top{
    right:14px;
    bottom:14px;
    padding:10px 14px;
    font-size:.8rem;
  }
  footer{padding:0 14px 50px}
  footer section{padding:18px}
}

@media (max-width:420px){
  h1{font-size:1.5rem}
  #site-header button[type="submit"],
  #theme-toggle{padding:7px 12px;font-size:.82rem}
  #articles article{padding:18px}
}

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

/* Print */
@media print{
  #site-header,
  #back-to-top,
  nav[aria-label="页面锚点导航"],
  nav[aria-label="面包屑导航"],
  footer{display:none}
  body{background:#fff;color:#000}
  section{box-shadow:none;border:1px solid #ddd;break-inside:avoid}
  #hero{background:#f2f2f2;color:#000}
  #hero h1,#hero p,#hero a{color:#000}
}