/* ===============================================================
 * 河南海泰化工有限公司 官网 - 主样式
 * 设计风格: B2B 工业蓝绿 / 数据驱动 / 严谨简洁
 * 主营: 乙二醇 MEG (2.5kg / 5kg / 20L / 25L / 450斤)
 * 与海硕(党政国货风) + 油小将(C端亲民橙)完全区分
 * =============================================================== */

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:'Inter','PingFang SC','Source Han Sans CN','Microsoft YaHei',sans-serif;
  font-size:15px;line-height:1.7;
  color:#0F172A;background:#F8FAFC;
  overflow-x:hidden
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none;transition:all .2s}
button{cursor:pointer;font-family:inherit;border:none;background:none}

:root{
  --teal:        #00875A;   /* 化工绿 - 主色 */
  --teal-deep:   #006644;
  --teal-light:  #10B981;
  --steel:       #1E293B;   /* 工业深灰 */
  --steel-mid:   #475569;
  --cyan:        #0EA5E9;
  --cyan-deep:   #0284C7;
  --bg:          #F8FAFC;
  --bg-card:     #FFFFFF;
  --line:        #E2E8F0;
  --text:        #0F172A;
  --text-mid:    #475569;
  --text-light:  #94A3B8;
  --shadow:      0 4px 16px rgba(15,23,42,0.06);
  --shadow-lg:   0 16px 48px rgba(15,23,42,0.12);
}

.wrap{max-width:1240px;margin:0 auto;padding:0 24px}
.wrap-narrow{max-width:960px;margin:0 auto;padding:0 24px}

/* ============== 顶部细工业条 ============== */
.topbar{
  background:var(--steel);
  color:rgba(255,255,255,0.7);
  font-size:12.5px;
  padding:8px 0;letter-spacing:0.5px
}
.topbar-inner{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}
.topbar a{color:rgba(255,255,255,0.85)}
.topbar a:hover{color:var(--teal-light)}
.topbar-icons{display:flex;gap:16px}

/* ============== 主导航 ============== */
.nav{
  background:#fff;
  border-bottom:1px solid var(--line);
  position:sticky;top:0;z-index:100
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;padding:18px 0}
.nav-brand{display:flex;align-items:center;gap:12px}
.nav-brand img{width:46px;height:46px;object-fit:contain}
.nav-brand-name{
  font-size:19px;font-weight:800;color:var(--steel);letter-spacing:0.5px
}
.nav-brand-en{font-size:11px;color:var(--text-light);letter-spacing:2px;margin-top:2px}
.nav-menu{display:flex;gap:32px}
.nav-menu a{
  font-size:14.5px;font-weight:600;color:var(--steel-mid);
  padding:8px 0;position:relative
}
.nav-menu a:hover,.nav-menu a.active{color:var(--teal)}
.nav-menu a.active::after{
  content:'';position:absolute;left:0;right:0;bottom:-19px;
  height:3px;background:var(--teal)
}
.nav-cta{
  background:var(--teal);color:#fff;padding:10px 22px;
  border-radius:6px;font-weight:600;font-size:14px;
  transition:.2s
}
.nav-cta:hover{background:var(--teal-deep);transform:translateY(-1px)}
.nav-burger{display:none;font-size:24px;color:var(--steel);cursor:pointer;padding:6px 10px;border-radius:6px}
.nav-burger:hover{background:var(--bg)}

/* ============== Hero (双栏 数据 + 产品视觉) ============== */
.hero{
  background:linear-gradient(135deg,#F0FDF4 0%,#ECFEFF 50%,#F0F9FF 100%);
  padding:80px 0;position:relative;overflow:hidden
}
.hero::before{
  content:'';position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(0,135,90,0.04) 1px,transparent 1px),
    linear-gradient(90deg,rgba(0,135,90,0.04) 1px,transparent 1px);
  background-size:48px 48px;
  mask-image:radial-gradient(ellipse at center,#000 30%,transparent 80%);
  -webkit-mask-image:radial-gradient(ellipse at center,#000 30%,transparent 80%);
  pointer-events:none
}
.hero-grid{display:grid;grid-template-columns:1.1fr 0.9fr;gap:60px;align-items:center;position:relative;z-index:2}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  background:#fff;border:1px solid var(--teal);
  color:var(--teal-deep);
  padding:7px 18px;border-radius:100px;
  font-size:13px;font-weight:600;letter-spacing:1px;margin-bottom:24px;
  box-shadow:0 4px 12px rgba(0,135,90,0.08)
}
.hero-badge-dot{
  width:6px;height:6px;background:var(--teal);border-radius:50%;
  box-shadow:0 0 0 4px rgba(0,135,90,0.15);
  animation:pulseDot 1.8s infinite
}
@keyframes pulseDot{
  0%,100%{box-shadow:0 0 0 4px rgba(0,135,90,0.15)}
  50%{box-shadow:0 0 0 8px rgba(0,135,90,0.0)}
}
.hero h1{
  font-size:clamp(36px,5vw,60px);
  font-weight:900;line-height:1.1;
  color:var(--steel);
  letter-spacing:-1px;
  margin-bottom:20px
}
.hero h1 .teal{color:var(--teal)}
.hero-desc{
  font-size:17px;color:var(--text-mid);line-height:1.8;
  margin-bottom:28px;max-width:520px
}
.hero-meta{
  display:grid;grid-template-columns:repeat(3,1fr);gap:20px;
  padding:24px 0;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  margin-bottom:28px
}
.hero-meta-item{text-align:left}
.hero-meta-num{
  font-size:28px;font-weight:900;
  color:var(--teal);line-height:1
}
.hero-meta-label{font-size:12.5px;color:var(--text-mid);margin-top:6px;letter-spacing:0.5px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:14px 28px;border-radius:6px;
  font-weight:700;font-size:14.5px;letter-spacing:0.5px;
  transition:all .25s;cursor:pointer
}
.btn-primary{
  background:var(--teal);color:#fff;
  box-shadow:0 6px 20px rgba(0,135,90,0.25)
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 28px rgba(0,135,90,0.35)}
.btn-outline{
  background:#fff;color:var(--steel);
  border:1.5px solid var(--line)
}
.btn-outline:hover{border-color:var(--teal);color:var(--teal)}
.btn-arrow{transition:transform .2s}
.btn:hover .btn-arrow{transform:translateX(4px)}

.hero-r{
  position:relative;
  display:flex;align-items:center;justify-content:center;
  height:480px
}
.hero-r-bg{
  position:absolute;inset:0;
  background:radial-gradient(circle at center,rgba(0,135,90,0.15) 0%,transparent 60%)
}
.hero-product{
  position:relative;z-index:2;
  background:linear-gradient(180deg,#fff 0%,#F0FDF4 100%);
  border-radius:24px;
  border:1px solid rgba(0,135,90,0.15);
  display:flex;align-items:center;justify-content:center;
  width:380px;height:420px;
  overflow:hidden;
  box-shadow:var(--shadow-lg)
}
.hero-product img{width:100%;height:100%;object-fit:cover}
.hero-formula{
  position:absolute;
  top:6%;right:0;
  background:#fff;
  padding:14px 18px;
  border-radius:14px;
  box-shadow:var(--shadow);
  font-family:'Courier New',monospace;
  font-size:14px;
  color:var(--teal-deep);
  font-weight:700;z-index:3
}
.hero-formula small{display:block;font-size:11px;color:var(--text-light);margin-top:2px;font-family:inherit}
.hero-spec{
  position:absolute;bottom:8%;left:0;
  background:#fff;
  padding:14px 18px;
  border-radius:14px;
  box-shadow:var(--shadow);
  font-size:13px;
  z-index:3
}
.hero-spec-row{display:flex;justify-content:space-between;gap:18px;padding:3px 0}
.hero-spec-row strong{color:var(--steel);font-weight:700}
.hero-spec-row span{color:var(--teal);font-weight:600}

/* ============== Section ============== */
.section{padding:80px 0}
.section-bw{background:#fff}
.section-head{text-align:center;margin-bottom:54px}
.section-eyebrow{
  display:inline-block;font-size:12px;font-weight:800;letter-spacing:4px;
  color:var(--teal);
  text-transform:uppercase;margin-bottom:14px
}
.section-h{font-size:clamp(28px,3.5vw,40px);font-weight:900;color:var(--steel);margin-bottom:14px;letter-spacing:-0.5px}
.section-p{font-size:15.5px;color:var(--text-mid);max-width:680px;margin:0 auto;line-height:1.8}

/* ============== 规格表 (5 规格) ============== */
.spec-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.spec-card{
  background:#fff;border:1px solid var(--line);border-radius:12px;
  padding:24px 18px;text-align:center;
  transition:all .25s;cursor:pointer;
  position:relative;overflow:hidden
}
.spec-card:hover{
  border-color:var(--teal);transform:translateY(-4px);
  box-shadow:0 12px 32px rgba(0,135,90,0.12)
}
.spec-card::before{
  content:'';position:absolute;top:0;left:0;right:0;height:3px;
  background:var(--teal);transform:scaleX(0);transform-origin:left;
  transition:transform .3s
}
.spec-card:hover::before{transform:scaleX(1)}
.spec-img{
  height:140px;
  background:linear-gradient(180deg,#F0FDF4,#fff);
  border-radius:10px;
  display:flex;align-items:center;justify-content:center;
  margin-bottom:16px;
  overflow:hidden
}
.spec-img img{max-width:75%;max-height:90%;object-fit:contain}
.spec-name{font-size:15px;font-weight:700;color:var(--steel);margin-bottom:4px}
.spec-desc{font-size:12px;color:var(--text-light);margin-bottom:14px;line-height:1.6;min-height:34px}
.spec-tag{
  display:inline-block;font-size:11px;
  background:rgba(0,135,90,0.08);color:var(--teal-deep);
  padding:3px 10px;border-radius:100px;font-weight:600
}

/* ============== 应用领域 6 卡 ============== */
.app-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.app-card{
  background:#fff;border:1px solid var(--line);border-radius:14px;
  padding:30px 26px;transition:all .25s
}
.app-card:hover{border-color:var(--teal-light);transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.app-icon{
  width:54px;height:54px;border-radius:12px;
  background:linear-gradient(135deg,var(--teal-light),var(--teal));
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:24px;margin-bottom:18px;
  box-shadow:0 8px 20px rgba(0,135,90,0.25)
}
.app-name{font-size:18px;font-weight:800;color:var(--steel);margin-bottom:8px}
.app-desc{font-size:13.5px;color:var(--text-mid);line-height:1.8}
.app-tags{margin-top:14px;display:flex;flex-wrap:wrap;gap:6px}
.app-tag{font-size:11px;background:var(--bg);color:var(--text-mid);padding:3px 10px;border-radius:100px}

/* ============== 资质墙 ============== */
.creds{background:#fff}
.creds-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:36px}
.cred-card{
  background:linear-gradient(180deg,#F8FAFC,#fff);
  border:1px solid var(--line);
  border-radius:12px;padding:18px;text-align:center;
  transition:.2s
}
.cred-card:hover{border-color:var(--teal);transform:translateY(-3px)}
.cred-img{
  height:200px;background:#fff;border-radius:8px;
  display:flex;align-items:center;justify-content:center;
  overflow:hidden;margin-bottom:14px;border:1px solid var(--line)
}
.cred-img img{max-width:88%;max-height:88%;object-fit:contain}
.cred-name{font-size:13px;color:var(--steel);font-weight:700}
.cred-org{font-size:11px;color:var(--text-light);margin-top:4px}

/* ============== CTA Band ============== */
.cta-band{
  background:linear-gradient(135deg,var(--teal) 0%,var(--teal-deep) 50%,var(--steel) 100%);
  color:#fff;
  padding:60px 0;
  position:relative;overflow:hidden
}
.cta-band::before{
  content:'';position:absolute;inset:0;
  background-image:radial-gradient(circle at 30% 50%,rgba(16,185,129,0.3) 0%,transparent 60%)
}
.cta-band-grid{
  position:relative;display:grid;grid-template-columns:1.4fr 1fr;
  gap:48px;align-items:center
}
.cta-band-h{font-size:clamp(26px,3.5vw,40px);font-weight:900;line-height:1.2;margin-bottom:14px}
.cta-band-p{font-size:15.5px;opacity:0.9;line-height:1.8;margin-bottom:20px}
.cta-band-form{
  background:rgba(255,255,255,0.1);
  backdrop-filter:blur(20px);
  border:1px solid rgba(255,255,255,0.2);
  border-radius:14px;padding:28px
}
.cta-band-form h3{font-size:18px;font-weight:700;margin-bottom:6px}
.cta-band-form .sub{color:rgba(255,255,255,0.7);font-size:13px;margin-bottom:18px}
.cta-band-input{
  width:100%;background:rgba(0,0,0,0.25);
  border:1px solid rgba(255,255,255,0.15);
  color:#fff;padding:11px 14px;
  border-radius:8px;font-size:14px;
  margin-bottom:10px;outline:none;font-family:inherit
}
.cta-band-input:focus{border-color:var(--teal-light)}
.cta-band-input::placeholder{color:rgba(255,255,255,0.4)}
.cta-band-submit{
  width:100%;background:var(--teal-light);color:#fff;
  padding:12px;border-radius:8px;
  font-size:15px;font-weight:700;letter-spacing:0.5px;
  margin-top:4px;transition:.2s
}
.cta-band-submit:hover{background:#0fb37c;transform:translateY(-1px)}

/* ============== Footer ============== */
.footer{background:var(--steel);color:rgba(255,255,255,0.7);padding:50px 0 20px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:36px}
.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.footer-brand img{width:46px;height:46px;background:#fff;border-radius:8px;padding:4px}
.footer-brand-name{color:#fff;font-size:18px;font-weight:800}
.footer-brand-en{color:rgba(255,255,255,0.5);font-size:11px;letter-spacing:2px}
.footer-desc{font-size:13.5px;line-height:1.8;margin-bottom:14px;max-width:380px}
.footer-col h4{color:#fff;font-size:13px;font-weight:700;margin-bottom:14px;letter-spacing:1.5px;text-transform:uppercase}
.footer-col a,.footer-col p{display:block;font-size:13.5px;line-height:2;color:rgba(255,255,255,0.55)}
.footer-col a:hover{color:var(--teal-light)}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,0.08);
  padding-top:20px;font-size:12px;color:rgba(255,255,255,0.4);
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px
}
.footer-bottom a{color:rgba(255,255,255,0.55)}
.footer-bottom a:hover{color:var(--teal-light)}

/* ============== 内页 hero ============== */
.page-hero{
  background:linear-gradient(135deg,#F0FDF4,#ECFEFF);
  padding:70px 0 50px;
  border-bottom:1px solid var(--line);
  text-align:center
}
.page-hero h1{font-size:clamp(30px,4vw,46px);font-weight:900;color:var(--steel);margin-bottom:12px}
.page-hero p{color:var(--text-mid);font-size:16px;max-width:680px;margin:0 auto}
.crumb{font-size:13px;color:var(--text-light);margin-bottom:16px}
.crumb a{color:var(--text-mid)}
.crumb a:hover{color:var(--teal)}

/* ============== 响应式 ============== */
@media (max-width:1000px){
  .nav-inner{position:relative;flex-wrap:wrap}
  .nav-menu{
    display:none;
    position:absolute;top:100%;left:0;right:0;
    flex-direction:column;gap:0;
    background:#fff;
    padding:12px 24px 18px;
    border-top:1px solid var(--line);
    box-shadow:0 8px 24px rgba(15,23,42,0.06);
    z-index:99
  }
  .nav-menu.open{display:flex}
  .nav-menu a{padding:12px 0;border-bottom:1px solid var(--line);font-size:15px}
  .nav-menu a:last-child{border-bottom:none}
  .nav-menu a.active::after{display:none}
  .nav-burger{display:block;order:3}
  .nav-cta{order:2;padding:8px 16px;font-size:13px}
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .hero-r{height:360px}
  .hero-meta{grid-template-columns:1fr 1fr 1fr;gap:16px}
  .spec-grid{grid-template-columns:repeat(2,1fr)}
  .app-grid{grid-template-columns:1fr}
  .creds-grid{grid-template-columns:repeat(2,1fr)}
  .cta-band-grid{grid-template-columns:1fr;gap:30px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:30px}
}
@media (max-width:600px){
  .spec-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .topbar-icons{display:none}
}

/* ====== 滚动浮入 ====== */
.fade-in{opacity:0;transform:translateY(20px);transition:all .6s}
.fade-in.visible{opacity:1;transform:translateY(0)}