:root{
  --brand:#1f6f5c;
  --brand-dark:#0d3b30;
  --brand-deep:#0a2b23;
  --brand-mid:#12463a;
  --accent:#f2b544;
  --accent-soft:#ffd27a;
  --bg:#f4f8f6;
  --bg-soft:#e8f5f0;
  --surface:#ffffff;
  --surface-glass:rgba(255,255,255,.72);
  --surface-glass-strong:rgba(255,255,255,.88);
  --text:#17251f;
  --text-soft:#4a5b54;
  --text-mute:#6f817a;
  --border:rgba(31,111,92,.16);
  --border-strong:rgba(31,111,92,.3);
  --shadow-sm:0 2px 8px rgba(13,59,48,.06);
  --shadow-md:0 10px 30px rgba(13,59,48,.1);
  --shadow-lg:0 24px 60px rgba(13,59,48,.16);
  --radius-sm:10px;
  --radius-md:16px;
  --radius-lg:24px;
  --radius-xl:32px;
  --grad-banner:linear-gradient(135deg,#1f6f5c 0%,#12463a 45%,#0d3b30 100%);
  --grad-accent:linear-gradient(135deg,#f2b544 0%,#ffd27a 100%);
  --grad-soft:linear-gradient(135deg,rgba(31,111,92,.09),rgba(242,181,68,.09));
  --ease:cubic-bezier(.22,.61,.36,1);
  --header-h:76px;
  --maxw:1180px;
}

html[data-theme="dark"]{
  --bg:#0b1512;
  --bg-soft:#122019;
  --surface:#14231d;
  --surface-glass:rgba(20,35,29,.72);
  --surface-glass-strong:rgba(20,35,29,.9);
  --text:#e6f2ec;
  --text-soft:#b3c6bd;
  --text-mute:#8ba39a;
  --border:rgba(232,245,240,.12);
  --border-strong:rgba(232,245,240,.22);
  --shadow-sm:0 2px 8px rgba(0,0,0,.4);
  --shadow-md:0 10px 30px rgba(0,0,0,.5);
  --shadow-lg:0 24px 60px rgba(0,0,0,.6);
  --grad-banner:linear-gradient(135deg,#12463a 0%,#0b2a22 50%,#071a15 100%);
  --grad-soft:linear-gradient(135deg,rgba(31,111,92,.22),rgba(242,181,68,.12));
}

*,*::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:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--text);
  background:var(--bg);
  background-image:radial-gradient(circle at 12% 0%,rgba(31,111,92,.08),transparent 42%),radial-gradient(circle at 88% 8%,rgba(242,181,68,.08),transparent 40%);
  background-attachment:fixed;
  transition:background-color .4s var(--ease),color .4s var(--ease);
  overflow-x:hidden;
}

img,svg{max-width:100%;display:block;}
a{color:var(--brand);text-decoration:none;transition:color .25s var(--ease);}
a:hover{color:var(--accent);}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4{line-height:1.35;margin:0 0 .6em;color:var(--text);font-weight:700;letter-spacing:.01em;}
h1{font-size:clamp(1.7rem,3.6vw,2.6rem);}
h2{font-size:clamp(1.4rem,2.6vw,2rem);}
h3{font-size:clamp(1.1rem,1.8vw,1.35rem);}
h4{font-size:1.1rem;}
p{margin:0 0 1em;}
strong{color:var(--text);}

::selection{background:var(--accent);color:#17251f;}

.visually-hidden{
  position:absolute!important;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);
  white-space:nowrap;border:0;
}

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

/* ============ HEADER ============ */
.site-header{
  position:sticky;
  top:0;left:0;right:0;
  z-index:1000;
  background:var(--surface-glass);
  -webkit-backdrop-filter:blur(18px) saturate(160%);
  backdrop-filter:blur(18px) saturate(160%);
  border-bottom:1px solid var(--border);
  transition:box-shadow .35s var(--ease),background .35s var(--ease),transform .35s var(--ease);
}
.site-header.is-scrolled{
  box-shadow:var(--shadow-md);
  background:var(--surface-glass-strong);
}
.header-inner{
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 24px;
  min-height:var(--header-h);
  display:flex;
  align-items:center;
  gap:20px;
}

.brand{
  display:flex;
  align-items:center;
  gap:12px;
  flex-shrink:0;
  color:var(--text);
}
.brand:hover{color:var(--text);}
.brand-logo{
  border-radius:12px;
  box-shadow:0 6px 18px rgba(31,111,92,.32);
  transition:transform .4s var(--ease),box-shadow .4s var(--ease);
}
.brand:hover .brand-logo{
  transform:rotate(-6deg) scale(1.06);
  box-shadow:0 10px 26px rgba(31,111,92,.45);
}
.brand-text{display:flex;flex-direction:column;line-height:1.25;}
.brand-text strong{font-size:1.15rem;letter-spacing:.04em;}
.brand-text small{font-size:.7rem;color:var(--text-mute);letter-spacing:.08em;}

.main-nav{margin-left:auto;}
.main-nav ul{display:flex;align-items:center;gap:2px;flex-wrap:wrap;}
.main-nav a{
  display:block;
  padding:8px 13px;
  font-size:.92rem;
  font-weight:500;
  color:var(--text-soft);
  border-radius:999px;
  position:relative;
  transition:color .25s var(--ease),background .25s var(--ease);
}
.main-nav a::after{
  content:"";
  position:absolute;
  left:50%;bottom:4px;
  width:0;height:2px;
  background:var(--grad-accent);
  border-radius:2px;
  transform:translateX(-50%);
  transition:width .3s var(--ease);
}
.main-nav a:hover{color:var(--brand);background:var(--grad-soft);}
.main-nav a:hover::after{width:60%;}

.header-tools{
  display:flex;
  align-items:center;
  gap:10px;
  flex-shrink:0;
}

.site-search{
  display:flex;
  align-items:center;
  background:var(--bg-soft);
  border:1px solid var(--border);
  border-radius:999px;
  padding:3px 3px 3px 14px;
  transition:border-color .3s var(--ease),box-shadow .3s var(--ease),background .3s var(--ease);
}
.site-search:focus-within{
  border-color:var(--brand);
  box-shadow:0 0 0 4px rgba(31,111,92,.14);
  background:var(--surface);
}
.site-search input{
  border:0;outline:0;
  background:transparent;
  color:var(--text);
  font-size:.88rem;
  width:130px;
  padding:6px 0;
  font-family:inherit;
}
.site-search input::placeholder{color:var(--text-mute);}
.site-search button{
  border:0;cursor:pointer;
  background:var(--grad-banner);
  color:#fff;
  font-size:.82rem;
  font-family:inherit;
  padding:6px 14px;
  border-radius:999px;
  transition:transform .25s var(--ease),filter .25s var(--ease);
}
.site-search button:hover{transform:translateY(-1px);filter:brightness(1.12);}

.theme-toggle,.menu-toggle{
  width:40px;height:40px;
  display:grid;place-items:center;
  border:1px solid var(--border);
  background:var(--surface);
  color:var(--text);
  border-radius:50%;
  cursor:pointer;
  font-size:1.05rem;
  line-height:1;
  transition:transform .3s var(--ease),background .3s var(--ease),border-color .3s var(--ease);
}
.theme-toggle:hover,.menu-toggle:hover{
  transform:rotate(12deg) scale(1.08);
  border-color:var(--brand);
  background:var(--grad-soft);
}
.menu-toggle{display:none;}

/* ============ HERO ============ */
.hero{
  max-width:var(--maxw);
  margin:0 auto;
  padding:36px 24px 12px;
  display:grid;
  grid-template-columns:1.05fr 1fr;
  gap:36px;
  align-items:center;
}

.hero-carousel{
  position:relative;
  border-radius:var(--radius-xl);
  overflow:hidden;
  box-shadow:var(--shadow-lg);
  aspect-ratio:4/3;
  background:var(--grad-banner);
  isolation:isolate;
}
.hero-carousel::after{
  content:"";
  position:absolute;
  inset:0;
  border-radius:inherit;
  border:1px solid rgba(255,255,255,.14);
  pointer-events:none;
}
.slide{
  position:absolute;
  inset:0;
  opacity:0;
  transform:scale(1.06);
  transition:opacity .8s var(--ease),transform 1.2s var(--ease);
  pointer-events:none;
}
.slide.is-active{
  opacity:1;
  transform:scale(1);
  pointer-events:auto;
}
.slide-art{width:100%;height:100%;object-fit:cover;}
.slide-caption{
  position:absolute;
  left:0;right:0;bottom:0;
  padding:64px 30px 30px;
  background:linear-gradient(to top,rgba(7,26,21,.92),rgba(7,26,21,.55) 55%,transparent);
  color:#e8f5f0;
}
.slide-caption h2{
  color:#fff;
  font-size:clamp(1.15rem,2vw,1.5rem);
  margin-bottom:.35em;
  text-shadow:0 2px 12px rgba(0,0,0,.35);
}
.slide-caption p{
  margin:0;
  font-size:.92rem;
  color:rgba(232,245,240,.88);
  max-width:34ch;
}

.carousel-controls{
  position:absolute;
  top:16px;right:16px;
  display:flex;
  gap:8px;
  z-index:2;
}
.carousel-controls button{
  width:38px;height:38px;
  border-radius:50%;
  border:1px solid rgba(255,255,255,.3);
  background:rgba(255,255,255,.16);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  color:#fff;
  font-size:1.3rem;
  line-height:1;
  cursor:pointer;
  display:grid;place-items:center;
  transition:background .3s var(--ease),transform .3s var(--ease);
}
.carousel-controls button:hover{
  background:rgba(255,255,255,.34);
  transform:scale(1.1);
}

.hero-intro h1{
  background:linear-gradient(120deg,var(--brand) 0%,var(--brand-mid) 55%,var(--accent) 130%);
  -webkit-background-clip:text;
  background-clip:text;
  -webkit-text-fill-color:transparent;
  color:transparent;
}
html[data-theme="dark"] .hero-intro h1{
  background:linear-gradient(120deg,#8fe0c8 0%,#5cc4a6 50%,var(--accent) 120%);
  -webkit-background-clip:text;
  background-clip:text;
}
.hero-intro .lead{
  color:var(--text-soft);
  font-size:1rem;
  line-height:1.9;
}

.hero-stats{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:12px;
  margin:26px 0;
}
.stat{
  background:var(--surface-glass);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  padding:14px 10px;
  text-align:center;
  box-shadow:var(--shadow-sm);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease);
}
.stat:hover{
  transform:translateY(-5px);
  box-shadow:var(--shadow-md);
  border-color:var(--border-strong);
}
.stat-num{
  display:block;
  font-size:clamp(1.15rem,2vw,1.55rem);
  font-weight:800;
  color:var(--brand);
  letter-spacing:.02em;
  font-variant-numeric:tabular-nums;
}
html[data-theme="dark"] .stat-num{color:#7fd6bd;}
.stat-label{
  display:block;
  font-size:.74rem;
  color:var(--text-mute);
  margin-top:2px;
}

.hero-actions{display:flex;flex-wrap:wrap;gap:14px;}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:13px 30px;
  border-radius:999px;
  font-weight:600;
  font-size:.95rem;
  position:relative;
  overflow:hidden;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),background .3s var(--ease),color .3s var(--ease);
}
.btn::before{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(120deg,transparent 30%,rgba(255,255,255,.35) 50%,transparent 70%);
  transform:translateX(-120%);
  transition:transform .7s var(--ease);
}
.btn:hover::before{transform:translateX(120%);}
.btn-primary{
  background:var(--grad-banner);
  color:#fff;
  box-shadow:0 12px 28px rgba(31,111,92,.32);
}
.btn-primary:hover{
  color:#fff;
  transform:translateY(-3px);
  box-shadow:0 18px 38px rgba(31,111,92,.42);
}
.btn-ghost{
  background:var(--surface-glass);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  color:var(--brand);
  border:1.5px solid var(--border-strong);
}
.btn-ghost:hover{
  color:var(--brand);
  transform:translateY(-3px);
  border-color:var(--brand);
  background:var(--grad-soft);
  box-shadow:var(--shadow-md);
}

/* ============ BREADCRUMB & ANCHOR NAV ============ */
.breadcrumb,.anchor-nav{
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 24px;
}
.breadcrumb{margin-top:20px;}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:8px;font-size:.84rem;color:var(--text-mute);}
.breadcrumb li+li::before{content:"/";margin-right:8px;color:var(--border-strong);}
.breadcrumb a{color:var(--text-mute);}
.breadcrumb a:hover{color:var(--brand);}

.anchor-nav{margin-top:14px;}
.anchor-nav ul{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  padding:10px;
  background:var(--surface-glass);
  -webkit-backdrop-filter:blur(16px);
  backdrop-filter:blur(16px);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  box-shadow:var(--shadow-sm);
}
.anchor-nav a{
  display:inline-block;
  padding:6px 14px;
  font-size:.82rem;
  color:var(--text-soft);
  border-radius:999px;
  background:var(--bg-soft);
  transition:background .25s var(--ease),color .25s var(--ease),transform .25s var(--ease);
}
.anchor-nav a:hover{
  background:var(--brand);
  color:#fff;
  transform:translateY(-2px);
}

/* ============ SECTIONS ============ */
.section{
  max-width:var(--maxw);
  margin:0 auto;
  padding:34px 24px;
  scroll-margin-top:calc(var(--header-h) + 12px);
}
.section>h2{
  position:relative;
  padding-left:20px;
  margin-bottom:1em;
  scroll-margin-top:calc(var(--header-h) + 12px);
}
.section>h2::before{
  content:"";
  position:absolute;
  left:0;top:.18em;bottom:.18em;
  width:6px;
  border-radius:6px;
  background:var(--grad-accent);
  box-shadow:0 0 14px rgba(242,181,68,.5);
}
.section h3{
  color:var(--brand);
  margin-top:1.6em;
  padding-bottom:.35em;
  border-bottom:1px dashed var(--border);
}
html[data-theme="dark"] .section h3{color:#7fd6bd;}
.section p{color:var(--text-soft);}

/* Card feel for content sections */
#about,#history,#products,#solutions,#scenarios,#cases,#howto,#faq,#contact,#privacy,#disclaimer{
  background:var(--surface-glass);
  -webkit-backdrop-filter:blur(18px);
  backdrop-filter:blur(18px);
  border:1px solid var(--border);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow-sm);
  margin-top:26px;
  margin-bottom:26px;
  padding:34px 32px;
  transition:box-shadow .4s var(--ease),border-color .4s var(--ease);
}
#about:hover,#history:hover,#products:hover,#solutions:hover,#scenarios:hover,#cases:hover,#howto:hover,#faq:hover,#contact:hover{
  box-shadow:var(--shadow-md);
  border-color:var(--border-strong);
}

/* ============ POSTS ============ */
#articles{
  position:relative;
}
.post{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  padding:22px 24px;
  margin-bottom:16px;
  box-shadow:var(--shadow-sm);
  position:relative;
  overflow:hidden;
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease);
}
.post::before{
  content:"";
  position:absolute;
  left:0;top:0;bottom:0;
  width:4px;
  background:var(--grad-accent);
  transform:scaleY(0);
  transform-origin:top;
  transition:transform .4s var(--ease);
}
.post:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-md);
  border-color:var(--border-strong);
}
.post:hover::before{transform:scaleY(1);}
.post h3{margin-top:0;border:0;padding:0;color:var(--text);font-size:1.12rem;line-height:1.5;}
.post-meta{
  font-size:.8rem!important;
  color:var(--text-mute)!important;
  margin-bottom:.6em;
  letter-spacing:.02em;
}
.post-summary{font-size:.94rem;margin-bottom:.8em;}
.read-more{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:.86rem;
  font-weight:600;
  color:var(--brand);
  padding:6px 16px;
  border-radius:999px;
  background:var(--grad-soft);
  transition:gap .3s var(--ease),background .3s var(--ease),color .3s var(--ease);
}
.read-more::after{content:"→";transition:transform .3s var(--ease);}
.read-more:hover{
  color:#fff;
  background:var(--grad-banner);
  gap:10px;
}
.read-more:hover::after{transform:translateX(3px);}

.article-bodies{
  margin-top:28px;
  display:grid;
  gap:16px;
}
.article-bodies article{
  background:var(--bg-soft);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  padding:20px 24px;
  transition:background .3s var(--ease),transform .3s var(--ease);
}
.article-bodies article:hover{
  background:var(--surface);
  transform:translateX(4px);
}
.article-bodies h4{
  color:var(--brand);
  margin-top:0;
  padding-bottom:.4em;
  border-bottom:1px dashed var(--border);
}
html[data-theme="dark"] .article-bodies h4{color:#7fd6bd;}
.article-bodies p{font-size:.92rem;margin-bottom:.7em;}
.article-bodies p:last-child{margin-bottom:0;}

/* ============ FAQ ============ */
.faq-item{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  margin-bottom:12px;
  overflow:hidden;
  transition:box-shadow .3s var(--ease),border-color .3s var(--ease);
}
.faq-item[open]{
  border-color:var(--border-strong);
  box-shadow:var(--shadow-md);
}
.faq-item summary{
  cursor:pointer;
  padding:16px 50px 16px 22px;
  font-weight:600;
  font-size:.97rem;
  color:var(--text);
  position:relative;
  list-style:none;
  transition:background .25s var(--ease),color .25s var(--ease);
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{
  content:"+";
  position:absolute;
  right:20px;top:50%;
  transform:translateY(-50%);
  width:26px;height:26px;
  display:grid;place-items:center;
  border-radius:50%;
  background:var(--grad-soft);
  color:var(--brand);
  font-size:1.15rem;
  font-weight:700;
  line-height:1;
  transition:transform .35s var(--ease),background .35s var(--ease),color .35s var(--ease);
}
.faq-item[open] summary::after{
  content:"−";
  transform:translateY(-50%) rotate(180deg);
  background:var(--grad-banner);
  color:#fff;
}
.faq-item summary:hover{background:var(--grad-soft);color:var(--brand);}
.faq-item p{
  padding:0 22px 18px;
  margin:0;
  font-size:.92rem;
  animation:fadeSlide .4s var(--ease);
}
@keyframes fadeSlide{
  from{opacity:0;transform:translateY(-6px);}
  to{opacity:1;transform:translateY(0);}
}

/* ============ SITEMAP & LINKS ============ */
#sitemap,#links{
  max-width:var(--maxw);
  margin:0 auto;
  padding:34px 24px;
}
.sitemap-list,.friend-links{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
}
.sitemap-list a,.friend-links a{
  display:inline-block;
  padding:9px 18px;
  font-size:.86rem;
  color:var(--text-soft);
  background:var(--surface-glass);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border:1px solid var(--border);
  border-radius:999px;
  transition:transform .3s var(--ease),background .3s var(--ease),color .3s var(--ease),border-color .3s var(--ease),box-shadow .3s var(--ease);
}
.sitemap-list a:hover,.friend-links a:hover{
  transform:translateY(-3px);
  background:var(--grad-banner);
  color:#fff;
  border-color:transparent;
  box-shadow:0 10px 24px rgba(31,111,92,.3);
}

/* ============ FOOTER ============ */
.site-footer{
  margin-top:48px;
  background:var(--grad-banner);
  color:rgba(232,245,240,.82);
  position:relative;
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-120px;right:-80px;
  width:340px;height:340px;
  border-radius:50%;
  background:radial-gradient(circle,rgba(242,181,68,.22),transparent 70%);
  pointer-events:none;
}
.footer-inner{
  max-width:var(--maxw);
  margin:0 auto;
  padding:52px 24px 40px;
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:32px;
  position:relative;
  z-index:1;
}
.footer-col h3{
  color:#fff;
  font-size:1rem;
  margin-bottom:1em;
  padding-bottom:.5em;
  border-bottom:1px solid rgba(232,245,240,.18);
  letter-spacing:.04em;
}
.footer-col p{
  font-size:.85rem;
  margin-bottom:.5em;
  color:rgba(232,245,240,.72);
  line-height:1.7;
}
.footer-col ul li{margin-bottom:.45em;}
.footer-col ul a{
  font-size:.85rem;
  color:rgba(232,245,240,.72);
  position:relative;
  padding-left:14px;
  transition:color .25s var(--ease),padding-left .25s var(--ease);
}
.footer-col ul a::before{
  content:"›";
  position:absolute;
  left:0;
  transition:transform .25s var(--ease);
}
.footer-col ul a:hover{color:var(--accent);padding-left:18px;}

/* ============ BACK TO TOP ============ */
#backToTop{
  position:fixed;
  right:22px;bottom:22px;
  width:48px;height:48px;
  border-radius:50%;
  border:1px solid rgba(255,255,255,.2);
  background:var(--grad-banner);
  color:#fff;
  font-size:1.25rem;
  cursor:pointer;
  display:grid;place-items:center;
  box-shadow:0 12px 30px rgba(13,59,48,.4);
  opacity:0;
  visibility:hidden;
  transform:translateY(20px) scale(.85);
  transition:opacity .35s var(--ease),transform .35s var(--ease),visibility .35s;
  z-index:900;
}
#backToTop.is-visible{
  opacity:1;
  visibility:visible;
  transform:translateY(0) scale(1);
}
#backToTop:hover{
  transform:translateY(-4px) scale(1.06);
  box-shadow:0 18px 40px rgba(13,59,48,.5);
}

/* ============ SCROLL REVEAL ============ */
.reveal{
  opacity:0;
  transform:translateY(28px);
  transition:opacity .7s var(--ease),transform .7s var(--ease);
  will-change:opacity,transform;
}
.reveal.is-visible{
  opacity:1;
  transform:translateY(0);
}

/* ============ RESPONSIVE ============ */
@media (max-width:1080px){
  .hero{grid-template-columns:1fr;gap:28px;}
  .hero-carousel{aspect-ratio:16/9;order:-1;}
  .main-nav a{padding:8px 10px;font-size:.86rem;}
  .site-search input{width:100px;}
}

@media (max-width:900px){
  :root{--header-h:68px;}
  .menu-toggle{display:grid;}
  .main-nav{
    position:fixed;
    top:var(--header-h);
    left:0;right:0;
    margin:0;
    background:var(--surface-glass-strong);
    -webkit-backdrop-filter:blur(22px) saturate(160%);
    backdrop-filter:blur(22px) saturate(160%);
    border-bottom:1px solid var(--border);
    box-shadow:var(--shadow-lg);
    max-height:0;
    overflow:hidden;
    transition:max-height .45s var(--ease),opacity .3s var(--ease);
    opacity:0;
  }
  .main-nav.is-open{
    max-height:520px;
    opacity:1;
    overflow-y:auto;
  }
  .main-nav ul{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:12px 16px 20px;
  }
  .main-nav a{
    padding:13px 16px;
    font-size:.95rem;
    border-radius:12px;
  }
  .main-nav a::after{display:none;}
  .site-search{display:none;}
  .footer-inner{grid-template-columns:repeat(2,1fr);gap:26px;}
}

@media (max-width:640px){
  body{font-size:15px;}
  .header-inner{padding:0 16px;gap:12px;}
  .brand-text small{display:none;}
  .brand-text strong{font-size:1.02rem;}
  .brand-logo{width:34px;height:34px;}
  .hero{padding:22px 16px 8px;}
  .hero-carousel{aspect-ratio:4/3;border-radius:var(--radius-lg);}
  .slide-caption{padding:48px 20px 20px;}
  .hero-stats{grid-template-columns:repeat(2,1fr);}
  .hero-actions .btn{flex:1 1 auto;padding:12px 22px;}
  .breadcrumb,.anchor-nav{padding:0 16px;}
  .section{padding:26px 16px;}
  #about,#history,#products,#solutions,#scenarios,#cases,#howto,#faq,#contact,#privacy,#disclaimer{
    padding:24px 18px;
    border-radius:var(--radius-md);
    margin-top:18px;
    margin-bottom:18px;
  }
  #sitemap,#links{padding:26px 16px;}
  .post{padding:18px 18px;}
  .article-bodies article{padding:16px 18px;}
  .faq-item summary{padding:14px 46px 14px 16px;font-size:.92rem;}
  .faq-item p{padding:0 16px 16px;}
  .footer-inner{grid-template-columns:1fr;padding:38px 16px 30px;gap:24px;}
  #backToTop{right:14px;bottom:14px;width:44px;height:44px;}
}

@media (max-width:400px){
  .hero-stats{grid-template-columns:1fr 1fr;gap:8px;}
  .stat{padding:10px 6px;}
  .sitemap-list a,.friend-links a{padding:7px 13px;font-size:.8rem;}
}

/* ============ MOTION PREFERENCE ============ */
@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,.hero-carousel,.anchor-nav,.breadcrumb,#backToTop,.site-footer,.carousel-controls{display:none!important;}
  body{background:#fff;color:#000;}
  .section{box-shadow:none;border:0;padding:0;margin:0 0 20px;}
  a{color:#000;text-decoration:underline;}
}