:root{
  --bg:#f4f5fb;
  --bg-soft:#ffffff;
  --bg-elevated:rgba(255,255,255,.72);
  --text:#1a1a2e;
  --text-soft:#4a4a68;
  --text-muted:#7c7c96;
  --border:rgba(26,26,46,.1);
  --brand:#f5a623;
  --brand-2:#e94560;
  --brand-3:#533483;
  --brand-4:#0f3460;
  --accent:#16c79a;
  --header-bg:rgba(255,255,255,.68);
  --shadow-sm:0 2px 8px rgba(26,26,46,.06);
  --shadow-md:0 8px 24px rgba(26,26,46,.1);
  --shadow-lg:0 18px 48px rgba(26,26,46,.14);
  --radius-sm:10px;
  --radius-md:16px;
  --radius-lg:24px;
  --radius-xl:32px;
  --maxw:1180px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

html[data-theme="dark"]{
  --bg:#0d0d1a;
  --bg-soft:#14142a;
  --bg-elevated:rgba(26,26,46,.66);
  --text:#f2f2fa;
  --text-soft:#c3c3d9;
  --text-muted:#8f8fb0;
  --border:rgba(242,242,250,.12);
  --header-bg:rgba(13,13,26,.72);
  --shadow-sm:0 2px 8px rgba(0,0,0,.4);
  --shadow-md:0 8px 24px rgba(0,0,0,.5);
  --shadow-lg:0 18px 48px rgba(0,0,0,.6);
}

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

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

body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Roboto,Helvetica,Arial,sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  background:
    radial-gradient(circle at 12% 8%,rgba(233,69,96,.14),transparent 42%),
    radial-gradient(circle at 88% 4%,rgba(245,166,35,.16),transparent 46%),
    radial-gradient(circle at 50% 100%,rgba(83,52,131,.14),transparent 52%),
    var(--bg);
  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:var(--brand-2);
  text-decoration:none;
  transition:color .25s var(--ease),opacity .25s var(--ease);
}

a:hover{
  color:var(--brand);
}

h1,h2,h3,h4{
  line-height:1.35;
  font-weight:800;
  letter-spacing:.2px;
  color:var(--text);
  scroll-margin-top:96px;
}

h1{
  font-size:clamp(1.6rem,3.4vw,2.6rem);
  margin:0 0 .6em;
}

h2{
  font-size:clamp(1.35rem,2.4vw,1.95rem);
  margin:0 0 .7em;
  position:relative;
  padding-left:16px;
}

h2::before{
  content:"";
  position:absolute;
  left:0;
  top:.18em;
  bottom:.18em;
  width:6px;
  border-radius:6px;
  background:linear-gradient(180deg,var(--brand),var(--brand-2));
}

h3{
  font-size:clamp(1.1rem,1.7vw,1.35rem);
  margin:1.4em 0 .5em;
  color:var(--text);
}

p{
  margin:0 0 1em;
  color:var(--text-soft);
}

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

ul,ol{
  margin:0 0 1.2em;
  padding-left:1.4em;
  color:var(--text-soft);
}

li{
  margin-bottom:.45em;
}

li::marker{
  color:var(--brand-2);
  font-weight:700;
}

section{
  max-width:var(--maxw);
  margin:0 auto;
  padding:clamp(28px,4vw,56px) clamp(16px,4vw,32px);
}

section + section{
  border-top:1px solid var(--border);
}

/* ===== Header ===== */
#site-header{
  position:sticky;
  top:0;
  z-index:1000;
  background:var(--header-bg);
  -webkit-backdrop-filter:blur(18px) saturate(180%);
  backdrop-filter:blur(18px) saturate(180%);
  border-bottom:1px solid var(--border);
  transition:background-color .35s var(--ease),box-shadow .35s var(--ease);
}

#site-header.is-scrolled{
  box-shadow:var(--shadow-md);
}

.header-inner{
  max-width:var(--maxw);
  margin:0 auto;
  padding:10px clamp(14px,3vw,28px);
  display:flex;
  align-items:center;
  gap:14px;
  flex-wrap:wrap;
}

.brand-logo{
  display:flex;
  align-items:center;
  gap:10px;
  flex-shrink:0;
  color:var(--text);
  font-weight:800;
}

.brand-logo svg{
  width:36px;
  height:36px;
  border-radius:10px;
  box-shadow:var(--shadow-sm);
  transition:transform .35s var(--ease);
}

.brand-logo:hover svg{
  transform:rotate(-8deg) scale(1.06);
}

.brand-name{
  font-size:1.05rem;
  letter-spacing:.5px;
  background:linear-gradient(90deg,var(--brand),var(--brand-2));
  -webkit-background-clip:text;
  background-clip:text;
  -webkit-text-fill-color:transparent;
}

#main-nav{
  flex:1 1 auto;
  min-width:0;
}

#main-nav ul{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  gap:2px 4px;
  justify-content:center;
}

#main-nav li{
  margin:0;
}

#main-nav a{
  display:block;
  padding:7px 11px;
  border-radius:999px;
  font-size:.9rem;
  font-weight:600;
  color:var(--text-soft);
  white-space:nowrap;
  transition:background-color .25s var(--ease),color .25s var(--ease),transform .25s var(--ease);
}

#main-nav a:hover,
#main-nav a:focus-visible{
  color:#fff;
  background:linear-gradient(120deg,var(--brand-2),var(--brand-3));
  transform:translateY(-2px);
  outline:none;
}

#menu-toggle,
#theme-toggle{
  border:1px solid var(--border);
  background:var(--bg-elevated);
  color:var(--text);
  font:inherit;
  font-size:.85rem;
  font-weight:700;
  padding:8px 14px;
  border-radius:999px;
  cursor:pointer;
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  transition:transform .25s var(--ease),background-color .25s var(--ease),box-shadow .25s var(--ease);
  flex-shrink:0;
}

#menu-toggle:hover,
#theme-toggle:hover{
  transform:translateY(-2px);
  box-shadow:var(--shadow-sm);
  background:linear-gradient(120deg,var(--brand),var(--brand-2));
  color:#fff;
}

#menu-toggle{
  display:none;
}

/* ===== Hero ===== */
#hero{
  max-width:var(--maxw);
  margin:0 auto;
  padding-top:clamp(36px,5vw,72px);
  text-align:center;
}

#hero h1{
  background:linear-gradient(100deg,var(--brand) 0%,var(--brand-2) 45%,var(--brand-3) 100%);
  -webkit-background-clip:text;
  background-clip:text;
  -webkit-text-fill-color:transparent;
  animation:heroIn .8s var(--ease) both;
}

.hero-lead{
  max-width:820px;
  margin:0 auto 1.6em;
  font-size:clamp(.98rem,1.4vw,1.12rem);
  color:var(--text-soft);
  animation:heroIn .8s .1s var(--ease) both;
}

.hero-actions{
  display:flex;
  flex-wrap:wrap;
  gap:14px;
  justify-content:center;
  margin-bottom:clamp(28px,4vw,48px);
  animation:heroIn .8s .2s var(--ease) both;
}

.btn-primary,
.btn-secondary{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:13px 30px;
  border-radius:999px;
  font-weight:800;
  font-size:.98rem;
  letter-spacing:.4px;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),filter .3s var(--ease);
}

.btn-primary{
  color:#fff;
  background:linear-gradient(120deg,var(--brand-2),var(--brand-3));
  box-shadow:0 10px 26px rgba(233,69,96,.34);
}

.btn-primary:hover{
  color:#fff;
  transform:translateY(-3px) scale(1.03);
  box-shadow:0 16px 36px rgba(233,69,96,.44);
  filter:brightness(1.06);
}

.btn-secondary{
  color:var(--text);
  background:var(--bg-elevated);
  border:1px solid var(--border);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
}

.btn-secondary:hover{
  color:#fff;
  background:linear-gradient(120deg,var(--brand),var(--brand-2));
  transform:translateY(-3px) scale(1.03);
  box-shadow:0 16px 36px rgba(245,166,35,.36);
}

.hero-banner{
  position:relative;
  border-radius:var(--radius-xl);
  overflow:hidden;
  box-shadow:var(--shadow-lg);
  background:linear-gradient(135deg,var(--brand-4),var(--brand-3));
  animation:heroIn .8s .3s var(--ease) both;
}

.hero-banner::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(120deg,rgba(233,69,96,.28),transparent 45%,rgba(245,166,35,.28));
  pointer-events:none;
}

.banner-slide{
  position:relative;
  animation:bannerFade 12s infinite;
}

.banner-slide:nth-child(2){
  animation-delay:4s;
}

.banner-slide:nth-child(3){
  animation-delay:8s;
}

.banner-slide svg{
  width:100%;
  display:block;
}

@keyframes bannerFade{
  0%,26%{opacity:1}
  33%,93%{opacity:.35}
  100%{opacity:1}
}

@keyframes heroIn{
  from{
    opacity:0;
    transform:translateY(26px);
  }
  to{
    opacity:1;
    transform:translateY(0);
  }
}

/* ===== Breadcrumb ===== */
#breadcrumb{
  max-width:var(--maxw);
  margin:0 auto;
  padding:18px clamp(16px,4vw,32px) 0;
}

#breadcrumb ol{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin:0;
  padding:0;
  font-size:.86rem;
  color:var(--text-muted);
}

#breadcrumb li{
  margin:0;
  display:flex;
  align-items:center;
  gap:8px;
}

#breadcrumb li + li::before{
  content:"›";
  color:var(--brand-2);
  font-weight:700;
}

#breadcrumb a{
  color:var(--text-muted);
  font-weight:600;
}

#breadcrumb a:hover{
  color:var(--brand-2);
}

/* ===== Cards ===== */
#about,
#products,
#solutions,
#cases,
#news,
#articles,
#faq,
#howto,
#contact,
#sitemap,
#links,
#legal{
  position:relative;
}

#about h3 + p,
#products h3 + p,
#solutions h3 + p,
#cases h3 + p,
#news h3 + ul,
#howto h3 + p,
#howto h3 + ul,
#howto h3 + ol,
#contact h3 + p,
#legal h3 + p{
  background:var(--bg-elevated);
  -webkit-backdrop-filter:blur(14px) saturate(160%);
  backdrop-filter:blur(14px) saturate(160%);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  padding:clamp(16px,2.4vw,26px);
  box-shadow:var(--shadow-sm);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease);
}

#about h3 + p:hover,
#products h3 + ul:hover,
#solutions h3 + p:hover,
#cases h3 + ul:hover,
#news h3 + ul:hover,
#howto h3 + ol:hover,
#contact h3 + p:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-md);
  border-color:rgba(233,69,96,.35);
}

#products ul,
#cases ul,
#news ul,
#links ul,
#sitemap ul{
  list-style:none;
  padding-left:0;
}

#products ul li,
#cases ul li,
#news ul li{
  position:relative;
  padding-left:26px;
  margin-bottom:.6em;
}

#products ul li::before,
#cases ul li::before,
#news ul li::before{
  content:"";
  position:absolute;
  left:0;
  top:.62em;
  width:10px;
  height:10px;
  border-radius:50%;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  box-shadow:0 0 0 4px rgba(245,166,35,.16);
}

/* ===== Articles ===== */
#articles article{
  background:var(--bg-elevated);
  -webkit-backdrop-filter:blur(14px) saturate(160%);
  backdrop-filter:blur(14px) saturate(160%);
  border:1px solid var(--border);
  border-radius:var(--radius-lg);
  padding:clamp(18px,2.6vw,30px);
  margin-bottom:20px;
  box-shadow:var(--shadow-sm);
  transition:transform .4s var(--ease),box-shadow .4s var(--ease),border-color .4s var(--ease);
  position:relative;
  overflow:hidden;
}

#articles article::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  width:100%;
  height:4px;
  background:linear-gradient(90deg,var(--brand),var(--brand-2),var(--brand-3));
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .45s var(--ease);
}

#articles article:hover{
  transform:translateY(-6px);
  box-shadow:var(--shadow-lg);
  border-color:rgba(233,69,96,.32);
}

#articles article:hover::before{
  transform:scaleX(1);
}

#articles article h3{
  margin-top:0;
}

#articles .meta{
  font-size:.82rem;
  color:var(--text-muted);
  letter-spacing:.3px;
  margin-bottom:.7em;
}

#articles article a{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-weight:800;
  font-size:.9rem;
  padding:8px 18px;
  border-radius:999px;
  color:#fff;
  background:linear-gradient(120deg,var(--brand-2),var(--brand-3));
  box-shadow:0 6px 18px rgba(233,69,96,.3);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),filter .3s var(--ease);
}

#articles article a::after{
  content:"→";
  transition:transform .3s var(--ease);
}

#articles article a:hover{
  color:#fff;
  transform:translateY(-2px);
  box-shadow:0 12px 26px rgba(233,69,96,.42);
  filter:brightness(1.07);
}

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

/* ===== FAQ ===== */
#faq details{
  background:var(--bg-elevated);
  -webkit-backdrop-filter:blur(14px) saturate(160%);
  backdrop-filter:blur(14px) saturate(160%);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  margin-bottom:12px;
  overflow:hidden;
  box-shadow:var(--shadow-sm);
  transition:box-shadow .35s var(--ease),border-color .35s var(--ease),transform .35s var(--ease);
}

#faq details:hover{
  border-color:rgba(245,166,35,.4);
  box-shadow:var(--shadow-md);
}

#faq details[open]{
  border-color:rgba(233,69,96,.42);
  transform:translateY(-2px);
}

#faq summary{
  cursor:pointer;
  padding:16px 48px 16px 20px;
  font-weight:800;
  font-size:1rem;
  color:var(--text);
  position:relative;
  list-style:none;
  transition:color .25s var(--ease),background-color .25s var(--ease);
}

#faq summary::-webkit-details-marker{
  display:none;
}

#faq summary::after{
  content:"+";
  position:absolute;
  right:18px;
  top:50%;
  transform:translateY(-50%);
  width:26px;
  height:26px;
  display:flex;
  align-items:center;
  justify-content:center;
  border-radius:50%;
  font-size:1.1rem;
  font-weight:700;
  color:#fff;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  transition:transform .35s var(--ease),background .35s var(--ease);
}

#faq details[open] summary::after{
  content:"−";
  transform:translateY(-50%) rotate(180deg);
  background:linear-gradient(135deg,var(--brand-2),var(--brand-3));
}

#faq summary:hover{
  color:var(--brand-2);
}

#faq details p{
  margin:0;
  padding:0 20px 18px;
  border-top:1px dashed var(--border);
  padding-top:14px;
  animation:fadeSlide .4s var(--ease) both;
}

@keyframes fadeSlide{
  from{
    opacity:0;
    transform:translateY(-8px);
  }
  to{
    opacity:1;
    transform:translateY(0);
  }
}

/* ===== HowTo ===== */
#howto ol{
  counter-reset:step;
  list-style:none;
  padding-left:0;
}

#howto ol li{
  counter-increment:step;
  position:relative;
  padding:14px 18px 14px 60px;
  margin-bottom:12px;
  background:var(--bg-elevated);
  -webkit-backdrop-filter:blur(12px) saturate(160%);
  backdrop-filter:blur(12px) saturate(160%);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  box-shadow:var(--shadow-sm);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease);
}

#howto ol li::before{
  content:counter(step);
  position:absolute;
  left:16px;
  top:50%;
  transform:translateY(-50%);
  width:32px;
  height:32px;
  display:flex;
  align-items:center;
  justify-content:center;
  border-radius:50%;
  font-weight:800;
  font-size:.9rem;
  color:#fff;
  background:linear-gradient(135deg,var(--brand-2),var(--brand-3));
  box-shadow:0 6px 16px rgba(83,52,131,.34);
}

#howto ol li:hover{
  transform:translateX(6px);
  border-color:rgba(233,69,96,.38);
  box-shadow:var(--shadow-md);
}

#howto ul li{
  position:relative;
  padding-left:24px;
}

#howto ul li::before{
  content:"✓";
  position:absolute;
  left:0;
  top:0;
  color:var(--accent);
  font-weight:800;
}

/* ===== Contact ===== */
#contact p{
  word-break:break-word;
}

#contact h3:first-of-type + p{
  border-left:4px solid var(--brand);
}

/* ===== Sitemap & Links ===== */
#sitemap ul,
#links ul{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(180px,1fr));
  gap:12px;
}

#sitemap li,
#links li{
  margin:0;
}

#sitemap a,
#links a{
  display:flex;
  align-items:center;
  justify-content:center;
  padding:14px 16px;
  border-radius:var(--radius-md);
  font-weight:700;
  font-size:.92rem;
  color:var(--text-soft);
  background:var(--bg-elevated);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border:1px solid var(--border);
  box-shadow:var(--shadow-sm);
  text-align:center;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),color .3s var(--ease),background .3s var(--ease);
}

#sitemap a:hover,
#links a:hover{
  color:#fff;
  background:linear-gradient(120deg,var(--brand),var(--brand-2));
  transform:translateY(-4px);
  box-shadow:var(--shadow-md);
}

/* ===== Legal ===== */
#legal h3 + p{
  border-left:4px solid var(--brand-2);
}

/* ===== Footer ===== */
#site-footer{
  position:relative;
  margin-top:40px;
  padding:clamp(32px,4vw,56px) clamp(16px,4vw,32px);
  background:linear-gradient(135deg,var(--brand-4),var(--brand-3));
  color:#eaeaf5;
  text-align:center;
  overflow:hidden;
}

#site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  background:
    radial-gradient(circle at 18% 20%,rgba(245,166,35,.28),transparent 42%),
    radial-gradient(circle at 82% 80%,rgba(233,69,96,.28),transparent 46%);
  pointer-events:none;
}

.footer-inner{
  position:relative;
  max-width:var(--maxw);
  margin:0 auto;
}

.footer-inner p{
  margin:0 0 .7em;
  color:rgba(234,234,245,.82);
  font-size:.88rem;
}

.footer-inner p:first-child{
  font-weight:800;
  color:#fff;
  font-size:.96rem;
}

/* ===== Back To Top ===== */
#back-to-top{
  position:fixed;
  right:clamp(14px,3vw,28px);
  bottom:clamp(14px,3vw,28px);
  z-index:900;
  border:none;
  cursor:pointer;
  font:inherit;
  font-size:.82rem;
  font-weight:800;
  color:#fff;
  padding:12px 18px;
  border-radius:999px;
  background:linear-gradient(120deg,var(--brand-2),var(--brand-3));
  box-shadow:0 12px 28px rgba(233,69,96,.4);
  opacity:0;
  visibility:hidden;
  transform:translateY(16px);
  transition:opacity .35s var(--ease),transform .35s var(--ease),visibility .35s var(--ease),box-shadow .35s var(--ease);
}

#back-to-top.is-visible{
  opacity:1;
  visibility:visible;
  transform:translateY(0);
}

#back-to-top:hover{
  transform:translateY(-4px) scale(1.05);
  box-shadow:0 18px 38px rgba(233,69,96,.5);
}

/* ===== Scroll Reveal ===== */
.reveal{
  opacity:0;
  transform:translateY(30px);
  transition:opacity .7s var(--ease),transform .7s var(--ease);
}

.reveal.is-visible{
  opacity:1;
  transform:translateY(0);
}

/* ===== Responsive ===== */
@media (max-width:900px){
  #main-nav ul{
    justify-content:flex-start;
  }
  #main-nav a{
    font-size:.86rem;
    padding:6px 10px;
  }
}

@media (max-width:768px){
  body{
    font-size:15px;
  }
  .header-inner{
    gap:10px;
  }
  #menu-toggle{
    display:inline-flex;
    margin-left:auto;
  }
  #main-nav{
    order:10;
    flex-basis:100%;
    max-height:0;
    overflow:hidden;
    transition:max-height .45s var(--ease);
  }
  #main-nav.is-open{
    max-height:640px;
  }
  #main-nav ul{
    flex-direction:column;
    gap:4px;
    padding:10px 0 4px;
  }
  #main-nav a{
    padding:11px 16px;
    border-radius:var(--radius-sm);
    background:var(--bg-elevated);
    border:1px solid var(--border);
    font-size:.94rem;
  }
  .hero-actions{
    flex-direction:column;
  }
  .btn-primary,
  .btn-secondary{
    width:100%;
  }
  #sitemap ul,
  #links ul{
    grid-template-columns:repeat(auto-fill,minmax(140px,1fr));
  }
  h2{
    padding-left:14px;
  }
  h2::before{
    width:5px;
  }
}

@media (max-width:480px){
  section{
    padding:24px 14px;
  }
  .brand-name{
    font-size:.95rem;
  }
  #theme-toggle,
  #menu-toggle{
    padding:7px 12px;
    font-size:.78rem;
  }
  #articles article{
    padding:16px;
  }
  #faq summary{
    padding:14px 44px 14px 16px;
    font-size:.94rem;
  }
  #howto ol li{
    padding:12px 14px 12px 54px;
  }
  #howto ol li::before{
    left:12px;
    width:28px;
    height:28px;
    font-size:.82rem;
  }
  #back-to-top{
    padding:10px 14px;
    font-size:.76rem;
  }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion:reduce){
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .reveal{
    opacity:1;
    transform:none;
  }
}

/* ===== Focus Visible ===== */
:focus-visible{
  outline:3px solid rgba(245,166,35,.65);
  outline-offset:2px;
  border-radius:6px;
}

/* ===== Selection ===== */
::selection{
  background:rgba(233,69,96,.28);
  color:var(--text);
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar{
  width:10px;
  height:10px;
}

::-webkit-scrollbar-track{
  background:transparent;
}

::-webkit-scrollbar-thumb{
  background:linear-gradient(180deg,var(--brand),var(--brand-2));
  border-radius:999px;
  border:2px solid transparent;
  background-clip:padding-box;
}

::-webkit-scrollbar-thumb:hover{
  background:linear-gradient(180deg,var(--brand-2),var(--brand-3));
  background-clip:padding-box;
}