/* ============================================================
   归谷科技 官网样式
   ============================================================ */

:root{
  --navy-900:#04121F;
  --navy-800:#062033;
  --navy-700:#0A2C45;
  --primary:#0E7C86;
  --primary-dark:#0A5F67;
  --accent:#17B8C4;
  --ink:#152430;
  --muted:#5C6E7C;
  --line:#E3EAF0;
  --bg-soft:#F4F8FA;
  --bg-white:#FFFFFF;
  --radius:14px;
  --shadow-sm:0 2px 10px rgba(10,44,69,.06);
  --shadow-md:0 10px 34px rgba(10,44,69,.10);
  --container:1180px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--ink);
  background:var(--bg-white);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
h1,h2,h3,h4{margin:0;line-height:1.35;font-weight:600;}
p{margin:0;}
ul{margin:0;padding:0;list-style:none;}

.container{
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding:0 24px;
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:13px 26px;
  border-radius:10px;
  font-size:16px;
  font-weight:500;
  border:1px solid transparent;
  cursor:pointer;
  transition:.22s ease;
  white-space:nowrap;
}
.btn-primary{background:var(--primary);color:#fff;}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 8px 22px rgba(14,124,134,.28);}
.btn-ghost{background:rgba(255,255,255,.10);color:#fff;border-color:rgba(255,255,255,.42);}
.btn-ghost:hover{background:rgba(255,255,255,.20);}
.btn-outline{background:#fff;color:var(--primary);border-color:var(--primary);}
.btn-outline:hover{background:#EEF8F9;}
.btn-sm{padding:9px 18px;font-size:14px;border-radius:8px;}
.btn-block{width:100%;}

/* ---------- Header ---------- */
.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:100;
  transition:.3s ease;
  padding:14px 0;
}
.site-header.scrolled{
  background:rgba(255,255,255,.94);
  backdrop-filter:blur(12px);
  box-shadow:var(--shadow-sm);
  padding:8px 0;
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;}
.brand{display:flex;align-items:center;gap:10px;}
.brand-mark{display:flex;align-items:center;}
.brand-text{display:flex;flex-direction:column;line-height:1.15;color:#fff;transition:.3s;}
.brand-text strong{font-size:19px;letter-spacing:1px;}
.brand-text small{font-size:10px;letter-spacing:2.4px;opacity:.72;}
.site-header.scrolled .brand-text{color:var(--navy-800);}

.main-nav{display:flex;align-items:center;gap:30px;}
.main-nav > a{color:rgba(255,255,255,.88);font-size:16px;position:relative;padding:4px 0;transition:.2s;}
.main-nav > a:hover{color:#fff;}
.main-nav > a:not(.btn)::after{
  content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;background:var(--accent);transition:.25s;
}
.main-nav > a:not(.btn):hover::after{width:100%;}
.site-header.scrolled .main-nav > a:not(.btn){color:var(--muted);}
.site-header.scrolled .main-nav > a:not(.btn):hover{color:var(--primary);}

.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;padding:8px;cursor:pointer;}
.nav-toggle span{width:24px;height:2px;background:#fff;border-radius:2px;transition:.3s;display:block;}
.site-header.scrolled .nav-toggle span{background:var(--navy-800);}

/* ---------- Hero ---------- */
.hero{
  position:relative;
  min-height:660px;
  height:99vh;
  display:flex;
  align-items:center;
  overflow:hidden;
  background:var(--navy-900);
}
.hero-media{position:absolute;inset:0;overflow:hidden;}
.hero-media img{
  width:100%;
  height:120%;
  object-fit:cover;
  object-position:center top;
}
.hero-overlay{
  position:absolute;inset:0;
  background:linear-gradient(100deg,rgba(4,18,31,.94) 0%,rgba(4,18,31,.78) 42%,rgba(4,18,31,.30) 78%,rgba(4,18,31,.15) 100%);
}
.hero-inner{position:relative;z-index:2;padding-top:90px;padding-bottom:60px;}
.eyebrow{
  display:inline-block;
  font-size:13px;
  letter-spacing:3px;
  color:var(--accent);
  border:1px solid rgba(23,184,196,.45);
  border-radius:999px;
  padding:6px 16px;
  margin-bottom:26px;
  background:rgba(23,184,196,.10);
}
.hero h1{
  color:#fff;
  font-size:clamp(34px,5.2vw,60px);
  letter-spacing:1px;
  margin-bottom:22px;
}
.hero-sub{
  color:rgba(255,255,255,.80);
  font-size:17px;
  max-width:620px;
  margin-bottom:34px;
}
.hero-sub strong{color:#fff;font-weight:600;}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:56px;}
.hero-stats{
  display:flex;
  flex-wrap:wrap;
  gap:0;
  border-top:1px solid rgba(255,255,255,.16);
  padding-top:26px;
}
.hero-stats li{
  flex:1 1 150px;
  display:flex;
  flex-direction:column;
  gap:2px;
  padding-right:24px;
}
.hero-stats strong{
  font-size:32px;
  color:#fff;
  font-weight:600;
  letter-spacing:.5px;
}
.hero-stats span{font-size:13px;color:rgba(255,255,255,.62);}

/* ---------- Section 通用 ---------- */
.section{padding:96px 0;}
.section-head{max-width:720px;margin-bottom:52px;}
.section-tag{
  font-size:15px;
  letter-spacing:3px;
  color:var(--primary);
  font-weight:500;
  margin-bottom:12px;
}
.section-tag-light{color:var(--accent);}
.section-head h2{font-size:clamp(26px,3.2vw,38px);margin-bottom:16px;}
.section-desc{color:var(--muted);font-size:16px;}

.grid{display:grid;gap:24px;}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-4{grid-template-columns:repeat(4,1fr);}

/* ---------- 痛点 ---------- */
.section-pain{background:var(--bg-soft);}
.card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:28px 24px;
  transition:.25s;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:transparent;}
.card-icon{
  width:52px;height:52px;
  border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  background:#EAF3F5;color:var(--primary);
  margin-bottom:18px;
}
.card-icon.icon-red{background:#FCEFEC;color:#C0553F;}
.card h3{font-size:17px;margin-bottom:10px;}
.card p{color:var(--muted);font-size:14.5px;}

/* ---------- 解决方案 ---------- */
.sol-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px;margin-bottom:64px;}
.sol-card{
  position:relative;
  border:1px solid var(--line);
  border-radius:18px;
  padding:40px 36px 34px;
  background:#fff;
  transition:.28s;
  overflow:hidden;
}
.sol-card:hover{box-shadow:var(--shadow-md);transform:translateY(-4px);}
.sol-card-dark{background:var(--navy-800);border-color:transparent;color:#fff;}
.sol-num{
  position:absolute;top:22px;right:28px;
  font-size:52px;font-weight:700;color:rgba(14,124,134,.10);
  line-height:1;
}
.sol-card-dark .sol-num{color:rgba(255,255,255,.08);}
.sol-card h3{font-size:22px;margin-bottom:14px;max-width:80%;}
.sol-card-dark h3{color:#fff;}
.sol-lead{color:var(--muted);font-size:15px;margin-bottom:22px;min-height:70px;}
.sol-card-dark .sol-lead{color:rgba(255,255,255,.72);}
.sol-list li{
  position:relative;
  padding:9px 0 9px 24px;
  font-size:14.5px;
  color:var(--ink);
  border-bottom:1px dashed var(--line);
}
.sol-card-dark .sol-list li{color:rgba(255,255,255,.86);border-bottom-color:rgba(255,255,255,.12);}
.sol-list li::before{
  content:"";position:absolute;left:2px;top:18px;
  width:8px;height:8px;border-radius:50%;background:var(--accent);
}
.sol-tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:22px;}
.sol-tags span{
  font-size:12.5px;padding:5px 13px;border-radius:999px;
  background:#EAF3F5;color:var(--primary-dark);
}
.sol-card-dark .sol-tags span{background:rgba(23,184,196,.16);color:var(--accent);}

.tech-adv{
  background:var(--bg-soft);
  border-radius:18px;
  padding:38px 36px;
}
.tech-adv-title{font-size:17px;margin-bottom:24px;color:var(--navy-800);}
.adv-item{padding:4px 18px 4px 0;}
.adv-item strong{display:block;font-size:15.5px;margin-bottom:8px;color:var(--navy-800);}
.adv-item p{font-size:14px;color:var(--muted);}

/* ---------- 架构 ---------- */
.arch-wrap{display:grid;grid-template-columns:1.05fr 1fr;gap:48px;align-items:center;}
.arch-visual{position:relative;border-radius:18px;overflow:hidden;box-shadow:var(--shadow-sm);}
.arch-visual img{width:100%;height:120%;object-fit:cover;object-position:center top;}
.arch-visual::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:24%;
  background:linear-gradient(to top,#F4F8FA 12%,rgba(244,248,250,0));
}
.arch-item{
  display:flex;gap:18px;
  padding:22px 0;
  border-bottom:1px solid var(--line);
}
.arch-item:last-child{border-bottom:0;}
.arch-badge{
  flex:0 0 42px;height:42px;
  border-radius:11px;
  display:flex;align-items:center;justify-content:center;
  background:#EAF3F5;color:var(--primary);
  font-size:14px;font-weight:600;
}
.arch-item h4{font-size:16.5px;margin-bottom:6px;}
.arch-item p{font-size:14px;color:var(--muted);}
.arch-item-accent .arch-badge{background:var(--navy-800);color:var(--accent);}
.arch-item-accent h4{color:var(--primary-dark);}

/* ---------- 硬件 ---------- */
.section-hardware{background:var(--bg-soft);}
.hw-card h3{font-size:17px;}
.hw-card p{font-size:14.5px;}

/* ---------- 案例 ---------- */
.case-card{
  border:1px solid var(--line);
  border-radius:18px;
  padding:32px 28px;
  background:#fff;
  display:flex;flex-direction:column;gap:14px;
  transition:.25s;
}
.case-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md);border-color:transparent;}
.case-tag{
  align-self:flex-start;
  font-size:12.5px;
  padding:5px 13px;border-radius:999px;
  background:#EAF3F5;color:var(--primary-dark);
}
.case-card h3{font-size:19px;}
.case-card p{font-size:14.5px;color:var(--muted);flex:1;}
.case-dev{display:flex;flex-wrap:wrap;gap:6px;}
.case-dev li{
  font-size:12px;padding:4px 10px;border-radius:6px;
  background:var(--bg-soft);color:var(--muted);
  border:1px solid var(--line);
}

/* ---------- 关于 ---------- */
.about-grid{display:grid;grid-template-columns:1.35fr 1fr;gap:56px;align-items:start;}
.about-text h2{font-size:clamp(24px,3vw,34px);margin-bottom:20px;}
.about-text p{color:var(--muted);font-size:15.5px;margin-bottom:16px;}
.about-points{margin-top:22px;}
.about-points li{
  position:relative;padding:8px 0 8px 26px;
  font-size:15px;color:var(--ink);
}
.about-points li::before{
  content:"";position:absolute;left:4px;top:16px;
  width:7px;height:7px;border-radius:50%;background:var(--primary);
}
.about-cta{
  background:var(--navy-800);
  border-radius:18px;
  padding:38px 32px;
  color:#fff;
}
.about-cta h3{font-size:21px;margin-bottom:14px;}
.about-cta p{color:rgba(255,255,255,.72);font-size:14.5px;margin-bottom:26px;}
.about-cta .btn-outline{background:transparent;color:#fff;border-color:rgba(255,255,255,.4);margin-top:12px;}
.about-cta .btn-outline:hover{background:rgba(255,255,255,.12);}

/* ---------- 联系 ---------- */
.section-contact{
  background:
    linear-gradient(rgba(4,18,31,.93),rgba(4,18,31,.96)),
    var(--navy-900);
  color:#fff;
}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:start;}
.contact-info h2{font-size:clamp(24px,2.8vw,32px);margin-bottom:34px;color:#fff;}
.contact-list li{
  display:flex;gap:16px;
  padding:16px 0;
  border-bottom:1px solid rgba(255,255,255,.12);
  font-size:15px;
  align-items:baseline;
}
.contact-list .ci-label{
  flex:0 0 52px;
  font-size:13px;color:var(--accent);letter-spacing:1px;
}
.contact-list strong{font-size:19px;font-weight:600;color:#fff;}
.contact-list a strong:hover{color:var(--accent);}
.contact-list span:last-child{color:rgba(255,255,255,.78);}

.contact-form{
  background:rgba(255,255,255,.05);
  border:1px solid rgba(255,255,255,.14);
  border-radius:18px;
  padding:34px 30px;
  backdrop-filter:blur(6px);
}
.field{margin-bottom:18px;}
.field label{
  display:block;font-size:13.5px;color:rgba(255,255,255,.72);margin-bottom:7px;
}
.field label em{color:#FF7A6B;font-style:normal;}
.field input,.field select,.field textarea{
  width:100%;
  padding:12px 14px;
  border-radius:9px;
  border:1px solid rgba(255,255,255,.20);
  background:rgba(255,255,255,.07);
  color:#fff;
  font-size:14.5px;
  font-family:inherit;
  transition:.2s;
}
.field textarea{resize:vertical;}
.field select option{color:var(--ink);}
.field input::placeholder,.field textarea::placeholder{color:rgba(255,255,255,.42);}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;border-color:var(--accent);background:rgba(255,255,255,.11);
}
.field input.err,.field textarea.err{border-color:#FF7A6B;}
.form-tip{font-size:13.5px;color:var(--accent);min-height:20px;margin-top:14px;text-align:center;}

/* ---------- Footer ---------- */
.site-footer{background:var(--navy-900);color:rgba(255,255,255,.6);padding:40px 0;font-size:14px;}
.footer-inner{display:flex;flex-wrap:wrap;gap:24px;align-items:center;justify-content:space-between;}
.footer-brand{display:flex;flex-direction:column;}
.footer-brand strong{color:#fff;font-size:17px;letter-spacing:1px;}
.footer-nav{display:flex;gap:24px;flex-wrap:wrap;}
.footer-nav a:hover{color:#fff;}
.footer-copy{width:100%;border-top:1px solid rgba(255,255,255,.10);padding-top:20px;margin-top:4px;font-size:13px;}
.footer-copy a{border-bottom:1px solid rgba(255,255,255,.28);}
.footer-copy a:hover{color:#fff;}

/* ---------- 动效 ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease;}
.reveal.visible{opacity:1;transform:none;}

/* ---------- 响应式 ---------- */
@media (max-width:1000px){
  .grid-4{grid-template-columns:repeat(2,1fr);}
  .grid-3{grid-template-columns:repeat(2,1fr);}
  .sol-grid,.arch-wrap,.about-grid,.contact-grid{grid-template-columns:1fr;gap:40px;}
  .sol-lead{min-height:0;}
  .hero-stats strong{font-size:26px;}
  .main-nav{
    position:fixed;top:0;right:0;height:100vh;width:min(78vw,300px);
    background:var(--navy-800);
    flex-direction:column;align-items:flex-start;gap:6px;
    padding:88px 28px 28px;
    transform:translateX(100%);
    transition:transform .32s ease;
    box-shadow:-8px 0 30px rgba(0,0,0,.3);
  }
  .main-nav.open{transform:none;}
  .main-nav > a{color:#fff !important;font-size:16px;width:100%;padding:12px 0;border-bottom:1px solid rgba(255,255,255,.10);}
  .main-nav .btn{margin-top:14px;}
  .nav-toggle{display:flex;position:relative;z-index:120;}
  .site-header{background:rgba(4,18,31,.55);backdrop-filter:blur(8px);}
  .site-header.scrolled{background:rgba(255,255,255,.95);}
  .site-header.nav-open .brand-text,
  .site-header.scrolled.nav-open .brand-text{color:#fff;}
  .site-header.nav-open .nav-toggle span{background:#fff;}
}
@media (max-width:640px){
  .section{padding:68px 0;}
  .grid-3,.grid-4{grid-template-columns:1fr;}
  .hero{min-height:620px;height:auto;padding:110px 0 60px;}
  .hero-stats li{flex:1 1 42%;}
  .hero-actions .btn{width:100%;}
  .sol-card{padding:30px 24px;}
  .tech-adv{padding:28px 22px;}
  .contact-form{padding:26px 20px;}
  .footer-inner{flex-direction:column;align-items:flex-start;}
}