/* =========================================================
   卓能达建筑科技 — 产品展示站样式
   风格：工程感 / 大字号 / 强对比 / 清晰层级
   ========================================================= */

:root{
  --ink:#0f1720;
  --ink-2:#1b2a3a;
  --ink-3:#2b3f53;
  --paper:#ffffff;
  --paper-2:#f4f6f8;
  --paper-3:#e8ecf0;
  --line:#d7dde4;
  --accent:#f26522;
  --accent-dark:#d4520f;
  --muted:#5b6b7a;
  --muted-light:rgba(255,255,255,.72);

  --container:1240px;
  --radius:2px;
  --shadow-sm:0 2px 10px rgba(15,23,32,.06);
  --shadow-md:0 18px 44px rgba(15,23,32,.12);

  --f-sans:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
}

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

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

body{
  margin:0;
  font-family:var(--f-sans);
  color:var(--ink);
  background:var(--paper);
  line-height:1.7;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}

img,svg{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;}

.container{
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding:0 40px;
}

/* ================= 通用文字 ================= */
.eyebrow{
  display:flex;
  align-items:center;
  gap:14px;
  margin:0 0 22px;
  font-size:13px;
  letter-spacing:.22em;
  font-weight:700;
  text-transform:uppercase;
  color:var(--muted);
}
.eyebrow.light{color:var(--muted-light);}
.eyebrow .rule{
  display:block;
  width:44px;
  height:3px;
  background:var(--accent);
  flex:0 0 auto;
}

.section-title{
  margin:0;
  font-size:clamp(30px,4.4vw,58px);
  line-height:1.14;
  letter-spacing:-.02em;
  font-weight:800;
  color:var(--ink);
}
.section-title.light{color:#fff;}

.section-lead{
  margin:0;
  font-size:clamp(15px,1.15vw,17px);
  color:var(--muted);
  max-width:520px;
  line-height:1.9;
}
.section-lead.light{color:var(--muted-light);}

.section{padding:110px 0;}
.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:60px;
  margin-bottom:64px;
}
.section-head.compact{margin-bottom:44px;}

/* ================= 按钮 ================= */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:14px 28px;
  font-size:15px;
  font-weight:700;
  letter-spacing:.04em;
  border:2px solid transparent;
  border-radius:var(--radius);
  cursor:pointer;
  transition:transform .18s ease,background-color .18s ease,color .18s ease,border-color .18s ease;
  white-space:nowrap;
}
.btn-lg{padding:18px 38px;font-size:16px;}

.btn-primary{
  background:var(--accent);
  color:#fff;
  border-color:var(--accent);
}
.btn-primary:hover{
  background:var(--accent-dark);
  border-color:var(--accent-dark);
  transform:translateY(-2px);
}

.btn-ghost{
  background:transparent;
  color:#fff;
  border-color:rgba(255,255,255,.45);
}
.btn-ghost:hover{
  background:#fff;
  color:var(--ink);
  border-color:#fff;
  transform:translateY(-2px);
}

.btn-block{width:100%;}

/* ================= 顶部导航 ================= */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  background:rgba(255,255,255,.94);
  backdrop-filter:saturate(160%) blur(12px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .2s ease;
}
.site-header.scrolled{box-shadow:var(--shadow-sm);}

.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:32px;
  height:78px;
}

.brand{
  display:flex;
  align-items:center;
  gap:14px;
  flex:0 0 auto;
}
.brand-mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:44px;
  height:44px;
  background:var(--ink);
  color:#fff;
  font-size:15px;
  font-weight:800;
  letter-spacing:.06em;
  flex:0 0 auto;
}
.brand-text{display:flex;flex-direction:column;line-height:1.2;}
.brand-text strong{
  font-size:19px;
  font-weight:800;
  letter-spacing:.02em;
}
.brand-text em{
  font-style:normal;
  font-size:9px;
  letter-spacing:.16em;
  color:var(--muted);
  margin-top:4px;
}

.nav{
  display:flex;
  align-items:center;
  gap:34px;
}
.nav-link{
  position:relative;
  font-size:15px;
  font-weight:600;
  color:var(--ink-2);
  padding:6px 0;
  transition:color .18s ease;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:0;
  height:3px;
  background:var(--accent);
  transition:width .22s ease;
}
.nav-link:hover,
.nav-link.active{color:var(--ink);}
.nav-link:hover::after,
.nav-link.active::after{width:100%;}

.nav-cta{margin-left:6px;padding:12px 24px;font-size:14px;}

.nav-toggle{
  display:none;
  width:46px;
  height:46px;
  padding:0;
  background:transparent;
  border:1px solid var(--line);
  cursor:pointer;
  position:relative;
}
.nav-toggle span{
  position:absolute;
  left:12px;
  right:12px;
  height:2px;
  background:var(--ink);
  transition:transform .22s ease,opacity .18s ease;
}
.nav-toggle span:nth-child(1){top:15px;}
.nav-toggle span:nth-child(2){top:22px;}
.nav-toggle span:nth-child(3){top:29px;}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle.open span:nth-child(2){opacity:0;}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* ================= 首屏 ================= */
.hero{
  position:relative;
  background:var(--ink);
  color:#fff;
  padding:96px 0 0;
  overflow:hidden;
}
.hero-grid{
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(255,255,255,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.055) 1px,transparent 1px);
  background-size:72px 72px;
  mask-image:radial-gradient(circle at 30% 25%,#000 10%,transparent 78%);
  -webkit-mask-image:radial-gradient(circle at 30% 25%,#000 10%,transparent 78%);
  pointer-events:none;
}
.hero::after{
  content:"";
  position:absolute;
  right:-16%;
  top:-18%;
  width:640px;
  height:640px;
  background:radial-gradient(circle,rgba(242,101,34,.22),transparent 68%);
  pointer-events:none;
}

.hero-inner{
  position:relative;
  display:grid;
  grid-template-columns:1.15fr .85fr;
  gap:70px;
  align-items:center;
  padding-bottom:78px;
}

.hero-content{max-width:720px;}

.hero-title{
  margin:0 0 30px;
  font-size:clamp(42px,6.2vw,88px);
  line-height:1.04;
  font-weight:900;
  letter-spacing:-.03em;
}
.hero-title .accent{color:var(--accent);}

.hero-desc{
  margin:0 0 40px;
  font-size:clamp(15px,1.2vw,17px);
  line-height:1.95;
  color:var(--muted-light);
  max-width:560px;
}

.hero-actions{display:flex;flex-wrap:wrap;gap:16px;}

/* 首屏视觉：纯 CSS 几何块 */
.hero-visual{position:relative;}
.visual-frame{
  position:relative;
  aspect-ratio:1/1;
  max-width:430px;
  margin-left:auto;
  border:1px solid rgba(255,255,255,.16);
  padding:22px;
  display:grid;
  grid-template-columns:1fr 1fr;
  grid-template-rows:1fr 1fr;
  gap:14px;
}
.visual-block{position:relative;overflow:hidden;}
.visual-block::after{
  content:"";
  position:absolute;
  inset:0;
  background-image:repeating-linear-gradient(135deg,rgba(255,255,255,.14) 0 2px,transparent 2px 12px);
}
.b1{background:linear-gradient(145deg,#31465c,#1b2a3a);}
.b2{background:linear-gradient(145deg,var(--accent),#b8400a);}
.b3{
  background:linear-gradient(145deg,#41566d,#243546);
  grid-column:1 / span 2;
}
.visual-label{
  position:absolute;
  left:-14px;
  bottom:-26px;
  background:#fff;
  color:var(--ink);
  padding:14px 20px;
  font-size:11px;
  font-weight:800;
  letter-spacing:.14em;
  line-height:1.6;
  box-shadow:var(--shadow-md);
}
.visual-label span{
  font-size:10px;
  font-weight:600;
  letter-spacing:.1em;
  color:var(--muted);
}

/* 首屏数据条 */
.hero-stats{
  position:relative;
  display:grid;
  grid-template-columns:repeat(4,1fr);
  border-top:1px solid rgba(255,255,255,.14);
  padding:34px 0 38px;
  gap:28px;
}
.stat{display:flex;flex-direction:column;gap:8px;}
.stat-num{
  font-size:clamp(26px,2.6vw,38px);
  font-weight:900;
  letter-spacing:-.02em;
  line-height:1;
}
.stat-num .unit{
  font-size:.46em;
  font-weight:700;
  margin-left:4px;
  color:var(--accent);
}
.stat-label{
  font-size:13px;
  color:var(--muted-light);
  letter-spacing:.06em;
}

/* ================= 核心产品 ================= */
.section-core{background:var(--paper);}

.core-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:26px;
}

.core-card{
  border:1px solid var(--line);
  background:var(--paper);
  padding:0 0 28px;
  display:flex;
  flex-direction:column;
  transition:transform .24s ease,box-shadow .24s ease,border-color .24s ease;
}
.core-card:hover{
  transform:translateY(-6px);
  box-shadow:var(--shadow-md);
  border-color:transparent;
}

.core-thumb{
  position:relative;
  height:176px;
  overflow:hidden;
  display:flex;
  align-items:flex-end;
  padding:18px;
}
.core-thumb::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(90deg,rgba(255,255,255,.12) 1px,transparent 1px),
    linear-gradient(rgba(255,255,255,.12) 1px,transparent 1px);
  background-size:26px 26px;
}
.core-thumb::after{
  content:"";
  position:absolute;
  right:-30px;
  bottom:-40px;
  width:130px;
  height:130px;
  border:14px solid rgba(255,255,255,.18);
  border-radius:50%;
}
.core-thumb span{
  position:relative;
  z-index:1;
  font-size:30px;
  font-weight:900;
  color:#fff;
  letter-spacing:-.02em;
}
.thumb-mortar{background:linear-gradient(135deg,#2f4356,#16222d);}
.thumb-grout{background:linear-gradient(135deg,#3a5169,#1d2c3a);}
.thumb-anchor{background:linear-gradient(135deg,var(--accent),#a83a08);}
.thumb-floor{background:linear-gradient(135deg,#4a5f74,#26343f);}

.core-card h3{
  margin:24px 24px 10px;
  font-size:22px;
  font-weight:800;
  letter-spacing:-.01em;
}
.core-card p{
  margin:0 24px 20px;
  font-size:14.5px;
  line-height:1.85;
  color:var(--muted);
}
.link-more{
  margin-top:auto;
  margin-left:24px;
  margin-right:24px;
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:13.5px;
  font-weight:800;
  letter-spacing:.08em;
  color:var(--ink);
  padding-top:6px;
}
.link-more span{
  transition:transform .2s ease;
  color:var(--accent);
  font-size:15px;
}
.link-more:hover span{transform:translateX(6px);}

/* ================= 公司优势 ================= */
.section-advantage{
  background:var(--ink-2);
  color:#fff;
  position:relative;
  overflow:hidden;
}
.section-advantage::before{
  content:"";
  position:absolute;
  left:-180px;
  bottom:-180px;
  width:520px;
  height:520px;
  border:1px solid rgba(255,255,255,.08);
  border-radius:50%;
  pointer-events:none;
}
.adv-wrap{
  display:grid;
  grid-template-columns:.9fr 1.1fr;
  gap:80px;
  align-items:start;
  position:relative;
}
.adv-head .section-lead{margin-top:28px;}

.adv-list{display:flex;flex-direction:column;}
.adv-item{
  display:grid;
  grid-template-columns:64px 1fr;
  gap:26px;
  padding:32px 0;
  border-top:1px solid rgba(255,255,255,.14);
}
.adv-item:last-child{border-bottom:1px solid rgba(255,255,255,.14);}
.adv-num{
  font-size:15px;
  font-weight:900;
  color:var(--accent);
  letter-spacing:.06em;
  padding-top:4px;
}
.adv-item h3{
  margin:0 0 8px;
  font-size:21px;
  font-weight:800;
  letter-spacing:-.01em;
}
.adv-item p{
  margin:0;
  font-size:14.5px;
  line-height:1.85;
  color:var(--muted-light);
}

/* ================= 产品中心 ================= */
.section-products{background:var(--paper-2);}

.filter-bar{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-bottom:40px;
  padding-bottom:34px;
  border-bottom:1px solid var(--line);
}
.filter-btn{
  padding:11px 24px;
  font-size:14px;
  font-weight:700;
  letter-spacing:.03em;
  color:var(--ink-2);
  background:transparent;
  border:1.5px solid var(--line);
  border-radius:0;
  cursor:pointer;
  transition:all .18s ease;
}
.filter-btn:hover{border-color:var(--ink-3);}
.filter-btn.active{
  background:var(--ink);
  border-color:var(--ink);
  color:#fff;
}

.product-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:26px;
}

.product-card{
  background:#fff;
  border:1px solid var(--line);
  display:flex;
  flex-direction:column;
  transition:transform .24s ease,box-shadow .24s ease;
}
.product-card:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-md);
}
.product-card.is-hidden{display:none;}

.product-media{
  position:relative;
  height:150px;
  overflow:hidden;
}
.product-media::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:repeating-linear-gradient(135deg,rgba(255,255,255,.10) 0 2px,transparent 2px 14px);
}
.product-media::after{
  content:"";
  position:absolute;
  width:110px;
  height:110px;
  right:-34px;
  bottom:-34px;
  border:12px solid rgba(255,255,255,.16);
  transform:rotate(45deg);
}
.media-tag{
  position:absolute;
  left:18px;
  bottom:16px;
  z-index:1;
  font-size:11px;
  font-weight:800;
  letter-spacing:.14em;
  color:#fff;
  border-left:3px solid var(--accent);
  padding-left:10px;
  line-height:1.2;
}
.media-a{background:linear-gradient(135deg,#2f4356,#17232e);}
.media-b{background:linear-gradient(135deg,#3b5168,#1b2937);}
.media-c{background:linear-gradient(135deg,#46596c,#22303c);}
.media-d{background:linear-gradient(135deg,#33485c,#16232e);}
.media-e{background:linear-gradient(135deg,#405870,#1e2d3b);}
.media-f{background:linear-gradient(135deg,#2b3f52,#141f28);}
.media-g{background:linear-gradient(135deg,var(--accent),#a5390a);}
.media-h{background:linear-gradient(135deg,#ef7a3f,#b8400a);}
.media-i{background:linear-gradient(135deg,#4a5f74,#24323d);}
.media-j{background:linear-gradient(135deg,#3d5266,#1c2935);}
.media-k{background:linear-gradient(135deg,#55697d,#2a3844);}

.product-body{
  padding:26px 26px 28px;
  display:flex;
  flex-direction:column;
  flex:1;
}
.product-body h3{
  margin:0 0 12px;
  font-size:21px;
  font-weight:800;
  letter-spacing:-.01em;
  line-height:1.35;
}
.product-desc{
  margin:0 0 22px;
  font-size:14px;
  line-height:1.8;
  color:var(--muted);
}
.spec-list{
  margin:0 0 22px;
  display:flex;
  flex-direction:column;
  border-top:1px solid var(--paper-3);
}
.spec-list > div{
  display:flex;
  justify-content:space-between;
  gap:16px;
  padding:11px 0;
  border-bottom:1px solid var(--paper-3);
  font-size:13px;
}
.spec-list dt{color:var(--muted);}
.spec-list dd{
  margin:0;
  font-weight:700;
  color:var(--ink);
  letter-spacing:.02em;
}
.product-body .link-more{margin:0;padding-top:0;}

/* ================= 应用场景 ================= */
.section-scene{background:#fff;}
.scene-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
}
.scene-item{
  background:#fff;
  padding:38px 30px 40px;
  transition:background-color .2s ease;
}
.scene-item:hover{background:var(--paper-2);}
.scene-index{
  display:inline-block;
  font-size:12px;
  font-weight:900;
  letter-spacing:.14em;
  color:var(--accent);
  border:1px solid var(--accent);
  width:26px;
  height:26px;
  line-height:24px;
  text-align:center;
  margin-bottom:22px;
}
.scene-item h3{
  margin:0 0 10px;
  font-size:19px;
  font-weight:800;
  letter-spacing:-.01em;
}
.scene-item p{
  margin:0;
  font-size:14px;
  line-height:1.8;
  color:var(--muted);
}

/* ================= 关于我们 ================= */
.section-about{background:var(--paper-2);}
.about-wrap{
  display:grid;
  grid-template-columns:1.15fr .85fr;
  gap:80px;
  align-items:start;
}
.about-lead{
  margin:30px 0 20px;
  font-size:clamp(17px,1.5vw,20px);
  line-height:1.85;
  font-weight:600;
  color:var(--ink-2);
}
.about-text{
  margin:0 0 18px;
  font-size:15.5px;
  line-height:1.95;
  color:var(--muted);
}

.about-facts{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:20px;
  margin-top:36px;
  padding-top:32px;
  border-top:1px solid var(--line);
}
.about-facts div{display:flex;flex-direction:column;gap:6px;}
.about-facts span{
  font-size:12.5px;
  letter-spacing:.08em;
  color:var(--muted);
}
.about-facts strong{
  font-size:19px;
  font-weight:800;
  color:var(--ink);
}

.about-right{display:flex;flex-direction:column;gap:22px;}
.cert-box{
  background:#fff;
  border:1px solid var(--line);
  padding:36px 34px;
}
.cert-box h3,
.value-box h3{
  margin:0 0 22px;
  font-size:19px;
  font-weight:800;
  letter-spacing:.01em;
}
.cert-list{
  list-style:none;
  margin:0 0 20px;
  padding:0;
  display:flex;
  flex-direction:column;
}
.cert-list li{
  display:flex;
  align-items:center;
  gap:12px;
  padding:13px 0;
  border-bottom:1px solid var(--paper-3);
  font-size:14.5px;
  color:var(--ink-2);
}
.cert-icon{
  width:14px;
  height:14px;
  flex:0 0 auto;
  border:3px solid var(--accent);
  display:inline-block;
}
.cert-note{
  margin:0;
  font-size:12.5px;
  line-height:1.8;
  color:var(--muted);
}
.value-box{
  background:var(--ink-2);
  color:#fff;
  padding:34px;
}
.value-box h3{color:#fff;}
.value-box p{
  margin:0;
  font-size:15px;
  line-height:1.9;
  color:var(--muted-light);
  border-left:3px solid var(--accent);
  padding-left:16px;
}

/* ================= 联系我们 ================= */
.section-contact{
  background:var(--ink);
  color:#fff;
}
.contact-wrap{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:80px;
  align-items:start;
}
.contact-info .section-title{margin-bottom:26px;}

.contact-list{
  list-style:none;
  margin:44px 0 0;
  padding:0;
  border-top:1px solid rgba(255,255,255,.16);
}
.contact-list li{
  display:grid;
  grid-template-columns:120px 1fr;
  gap:20px;
  padding:20px 0;
  border-bottom:1px solid rgba(255,255,255,.16);
  align-items:baseline;
}
.cl-label{
  font-size:12.5px;
  letter-spacing:.1em;
  color:var(--muted-light);
}
.cl-value{
  font-size:17px;
  font-weight:700;
  color:#fff;
  letter-spacing:.01em;
  word-break:break-all;
}

.contact-form-box{
  background:#fff;
  color:var(--ink);
  padding:44px 40px;
}
.contact-form-box h3{
  margin:0 0 8px;
  font-size:26px;
  font-weight:800;
  letter-spacing:-.01em;
}
.form-note{
  margin:0 0 28px;
  font-size:12.5px;
  color:var(--muted);
  line-height:1.7;
}
.field{display:flex;flex-direction:column;gap:8px;margin-bottom:18px;}
.field label{
  font-size:12.5px;
  font-weight:700;
  letter-spacing:.08em;
  color:var(--ink-2);
}
.field input,
.field select,
.field textarea{
  width:100%;
  padding:13px 14px;
  font-family:inherit;
  font-size:14.5px;
  color:var(--ink);
  background:var(--paper-2);
  border:1.5px solid transparent;
  border-radius:0;
  outline:none;
  transition:border-color .18s ease,background-color .18s ease;
}
.field textarea{resize:vertical;min-height:104px;}
.field input:focus,
.field select:focus,
.field textarea:focus{
  border-color:var(--accent);
  background:#fff;
}
.field input::placeholder,
.field textarea::placeholder{color:#9aa7b3;}

.form-tip{
  margin:14px 0 0;
  font-size:13px;
  font-weight:600;
  color:var(--accent-dark);
  min-height:20px;
}

/* ================= 页脚 ================= */
.site-footer{
  background:var(--ink-2);
  color:var(--muted-light);
  padding:48px 0 40px;
}
.footer-inner{
  display:grid;
  grid-template-columns:1fr auto;
  gap:32px;
  align-items:center;
}
.footer-brand{display:flex;align-items:center;gap:16px;}
.footer-brand strong{
  display:block;
  font-size:17px;
  color:#fff;
  font-weight:800;
}
.footer-brand p{
  margin:4px 0 0;
  font-size:12.5px;
  letter-spacing:.04em;
}
.footer-links{
  display:flex;
  gap:28px;
  font-size:13.5px;
  font-weight:600;
}
.footer-links a{transition:color .18s ease;}
.footer-links a:hover{color:#fff;}
.footer-copy{
  grid-column:1 / -1;
  margin:24px 0 0;
  padding-top:24px;
  border-top:1px solid rgba(255,255,255,.12);
  font-size:12.5px;
  letter-spacing:.03em;
  line-height:1.9;
}

/* ================= 滚动显现 ================= */
.reveal{
  opacity:0;
  transform:translateY(22px);
  transition:opacity .6s ease,transform .6s ease;
}
.reveal.in-view{
  opacity:1;
  transform:none;
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  .reveal{opacity:1;transform:none;transition:none;}
  .btn,.core-card,.product-card,.link-more span{transition:none;}
}

/* ================= 响应式 ================= */
@media (max-width:1120px){
  .container{padding:0 32px;}
  .hero-inner{gap:48px;}
  .adv-wrap{gap:52px;}
  .about-wrap{gap:52px;}
  .contact-wrap{gap:52px;}
  .core-grid{grid-template-columns:repeat(2,1fr);}
  .product-grid{grid-template-columns:repeat(2,1fr);}
  .scene-grid{grid-template-columns:repeat(2,1fr);}
}

@media (max-width:900px){
  .section{padding:82px 0;}
  .section-head{
    flex-direction:column;
    align-items:flex-start;
    gap:24px;
    margin-bottom:48px;
  }
  .section-lead{max-width:100%;}

  .hero{padding-top:64px;}
  .hero-inner{
    grid-template-columns:1fr;
    gap:56px;
    padding-bottom:56px;
  }
  .hero-visual{order:2;}
  .visual-frame{
    max-width:100%;
    aspect-ratio:16/11;
    margin-left:0;
  }
  .visual-label{bottom:-18px;left:0;}

  .hero-stats{
    grid-template-columns:repeat(2,1fr);
    gap:26px;
  }

  .adv-wrap,
  .about-wrap,
  .contact-wrap{
    grid-template-columns:1fr;
    gap:48px;
  }
  .about-facts{grid-template-columns:1fr 1fr;}
}

@media (max-width:768px){
  .container{padding:0 22px;}

  .header-inner{height:68px;}
  .brand-mark{width:38px;height:38px;font-size:13px;}
  .brand-text strong{font-size:16.5px;}
  .brand-text em{display:none;}

  .nav-toggle{display:block;}

  .nav{
    position:fixed;
    top:68px;
    left:0;
    right:0;
    background:#fff;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:8px 22px 26px;
    border-bottom:1px solid var(--line);
    box-shadow:0 12px 28px rgba(15,23,32,.10);
    transform:translateY(-12px);
    opacity:0;
    visibility:hidden;
    transition:transform .22s ease,opacity .22s ease,visibility .22s;
    max-height:calc(100vh - 68px);
    overflow-y:auto;
  }
  .nav.open{
    transform:none;
    opacity:1;
    visibility:visible;
  }
  .nav-link{
    padding:16px 0;
    font-size:17px;
    border-bottom:1px solid var(--paper-3);
  }
  .nav-link::after{display:none;}
  .nav-cta{
    margin:20px 0 0;
    padding:15px 24px;
    font-size:15px;
    border-bottom:none;
  }

  .hero-title{font-size:clamp(34px,9.2vw,52px);}
  .hero-desc{font-size:15px;}
  .hero-actions{gap:12px;}
  .btn-lg{
    padding:15px 26px;
    font-size:15px;
    flex:1 1 auto;
  }
  .hero-stats{padding:26px 0 30px;gap:22px;}

  .core-grid,
  .product-grid,
  .scene-grid{
    grid-template-columns:1fr;
  }
  .core-thumb{height:148px;}

  .adv-item{
    grid-template-columns:44px 1fr;
    gap:18px;
    padding:26px 0;
  }
  .adv-item h3{font-size:19px;}

  .filter-bar{
    gap:8px;
    margin-bottom:30px;
    padding-bottom:26px;
  }
  .filter-btn{
    padding:10px 18px;
    font-size:13px;
  }

  .contact-list li{
    grid-template-columns:1fr;
    gap:6px;
    padding:16px 0;
  }
  .contact-form-box{padding:30px 22px;}
  .contact-form-box h3{font-size:22px;}

  .footer-inner{grid-template-columns:1fr;gap:26px;}
  .footer-links{
    flex-wrap:wrap;
    gap:18px 24px;
  }
}

@media (max-width:420px){
  .hero-stats{grid-template-columns:1fr;}
  .about-facts{grid-template-columns:1fr;}
  .btn-lg{width:100%;flex:1 1 100%;}
  .visual-label{
    font-size:10px;
    padding:10px 14px;
  }
}


/* ================= 完整产品系列 ================= */
.series-wrap{
  margin-top:64px;
  padding-top:46px;
  border-top:1px solid var(--line);
}
.series-title{
  margin:0 0 10px;
  font-size:clamp(24px,3vw,34px);
  line-height:1.25;
  letter-spacing:-.02em;
  font-weight:800;
}
.series-note{margin:0;color:var(--muted);font-size:14px;}
.series-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:22px;
  margin-top:30px;
}
.series-item{
  background:var(--paper);
  border:1px solid var(--line);
  border-left:4px solid var(--accent);
  padding:24px 26px 26px;
  box-shadow:var(--shadow-sm);
  transition:box-shadow .25s ease,transform .25s ease;
}
.series-item:hover{box-shadow:var(--shadow-md);transform:translateY(-2px);}
.series-top{
  display:flex;
  align-items:center;
  gap:12px;
  flex-wrap:wrap;
  margin-bottom:16px;
  padding-bottom:14px;
  border-bottom:1px dashed var(--line);
}
.series-no{font-size:13px;font-weight:800;letter-spacing:.12em;color:var(--accent);}
.series-top h4{
  margin:0;
  font-size:19px;
  font-weight:800;
  letter-spacing:-.01em;
  color:var(--ink);
}
.series-count{
  margin-left:auto;
  font-size:12px;
  font-weight:700;
  color:var(--muted);
  background:var(--paper-2);
  border:1px solid var(--line);
  padding:3px 10px;
  white-space:nowrap;
}
.series-tags{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
}
.series-tags li{
  font-size:13px;
  line-height:1.45;
  color:var(--ink-3);
  background:var(--paper-2);
  border:1px solid var(--line);
  padding:6px 11px;
}
@media (max-width:900px){
  .series-grid{grid-template-columns:1fr;}
  .series-wrap{margin-top:48px;padding-top:34px;}
}
@media (max-width:420px){
  .series-item{padding:20px 18px;}
  .series-tags li{font-size:12px;}
}