/* =========================================================
   智远网络 官网 全局样式
   风格：深青商务风 · 多页官网
   ========================================================= */
:root{
  --ink:#16251f;            /* 主文字 */
  --ink-2:#5a6b63;          /* 次要文字 */
  --ink-3:#8da19a;          /* 弱文字 */
  --line:#e5ebe7;           /* 分隔线 */
  --bg:#f6f9f7;             /* 页面浅灰底 */
  --card:#ffffff;
  --accent:#0e7c6b;         /* 深青主色 */
  --accent-2:#0b5f52;
  --accent-soft:#e6f1ee;
  --dark:#0d1f1a;           /* 深色段 */
  --header-h:64px;
  --radius:14px;
  --shadow:0 12px 34px rgba(13,35,30,.09);
  --font:"Microsoft YaHei UI","Microsoft YaHei","PingFang SC","Segoe UI",system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--ink);line-height:1.75;
  background:var(--bg);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
ul,ol{margin:0;padding:0}
img{max-width:100%;display:block}
.container{max-width:1120px;margin:0 auto;padding:0 24px}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;cursor:pointer;
  font-family:inherit;font-size:15px;font-weight:600;line-height:1.2;border-radius:999px;
  padding:13px 26px;transition:transform .15s ease,box-shadow .2s ease,background .2s ease,color .2s ease;
  text-align:center}
.btn:active{transform:translateY(1px)}
.btn-sm{padding:9px 16px;font-size:14px}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-2);box-shadow:var(--shadow)}
.btn-light{background:#fff;color:var(--accent-2)}
.btn-light:hover{background:var(--accent-soft)}
.btn-ghost{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.45)}
.btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.08)}
.btn-outline{background:#fff;color:var(--accent);border:1.5px solid var(--accent)}
.btn-outline:hover{background:var(--accent-soft)}

/* ---------- 顶栏 ---------- */
.site-header{position:sticky;top:0;z-index:60;height:var(--header-h);
  background:rgba(255,255,255,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-wrap{height:var(--header-h);display:flex;align-items:center;gap:34px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;letter-spacing:.5px}
.brand-mark{width:27px;height:27px;border-radius:9px;background:radial-gradient(circle at 30% 28%,#3ec6ac,var(--accent) 58%,var(--accent-2));
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.28)}
.nav{display:flex;gap:6px;margin-right:auto;flex-wrap:wrap}
.nav-link{color:var(--ink-2);font-size:15px;font-weight:500;padding:8px 13px;border-radius:10px;transition:color .18s,background .18s}
.nav-link:hover{color:var(--accent);background:var(--accent-soft)}
.nav-link.is-current{color:var(--accent);background:var(--accent-soft);font-weight:600}

/* 产品中心下拉 */
.nav-item{position:relative}
.nav-toggle{display:inline-flex;align-items:center;gap:3px}
.caret{font-size:11px;opacity:.7;transition:transform .18s}
.nav-item:hover .caret,.nav-item.open .caret{transform:rotate(180deg)}
.dropdown{position:absolute;top:calc(100% + 8px);left:50%;transform:translateX(-50%) translateY(6px);
  min-width:156px;background:#fff;border:1px solid var(--line);border-radius:10px;
  box-shadow:var(--shadow);padding:6px;opacity:0;visibility:hidden;transition:opacity .18s,transform .18s;
  z-index:80}
/* 透明桥接区：覆盖触发器与下拉之间的间隙，鼠标可连续滑入避免中途收起 */
.dropdown::before{content:"";position:absolute;left:0;right:0;bottom:100%;height:12px}
.nav-item:hover .dropdown,.nav-item.open .dropdown,.nav-item:focus-within .dropdown{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.dropdown-link{display:block;padding:9px 14px;border-radius:8px;color:var(--ink-2);font-size:14.5px;white-space:nowrap}
.dropdown-link:hover,.dropdown-link.is-current{background:var(--accent-soft);color:var(--accent)}
.nav-link:focus-visible,.btn:focus-visible,a:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:6px}

/* ---------- 内页横幅 ---------- */
.page-hero{background:radial-gradient(1000px 420px at 85% -25%,rgba(14,124,107,.5),transparent 60%),
  linear-gradient(160deg,#0d1f1a,#17352c);color:#fff;padding:78px 0 64px}
.page-title{font-size:clamp(30px,4.4vw,44px);margin:0 0 12px;letter-spacing:.5px}
.eyebrow{display:inline-block;font-size:13.5px;letter-spacing:2px;color:#9fd8cd;
  border:1px solid rgba(159,216,205,.4);border-radius:999px;padding:5px 13px;margin:0 0 18px}
.page-sub{color:#cfe0dc;font-size:16px;margin:0;max-width:640px}
.crumbs{margin-top:20px;font-size:13px;color:#8fb3ab}
.crumbs a{color:#cfe0dc}.crumbs a:hover{color:#fff}

/* ---------- 通用区块 ---------- */
.section{padding:86px 0}
.section-alt{background:var(--card);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{max-width:680px;margin:0 auto 48px;text-align:center}
.section-title{font-size:clamp(26px,3.4vw,34px);margin:0 0 10px;letter-spacing:.5px}
.section-sub{color:var(--ink-2);margin:0;font-size:16px}

/* ---------- 产品卡片 ---------- */
.products-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:28px}
.product-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column;transition:transform .2s ease,box-shadow .2s ease}
.product-card:hover{transform:translateY(-4px);box-shadow:0 18px 44px rgba(13,35,30,.14)}
.shot-frame{aspect-ratio:16/9;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;
  color:#9aa6ab;background:repeating-linear-gradient(45deg,#f2f5f3,#f2f5f3 12px,#e9eeeb 12px,#e9eeeb 24px);
  border-bottom:1px dashed var(--line)}
.shot-icon{color:#b7c2bd}
.shot-label{font-size:15px;font-weight:600;margin:4px 0 0;color:#8a9792}
.shot-tip{font-size:12.5px;margin:0;color:#aab4ae}
.product-shot{width:100%;height:100%;aspect-ratio:16/9;object-fit:cover;display:block}
.product-body{padding:24px;display:flex;flex-direction:column;gap:14px;flex:1}
.product-name{font-size:21px;margin:0}
.product-desc{color:var(--ink-2);margin:0;font-size:14.5px;flex:1}
.product-tags{display:flex;flex-wrap:wrap;gap:8px;list-style:none}
.product-tags li{background:var(--accent-soft);color:var(--accent-2);font-size:13px;padding:4px 12px;border-radius:999px}
.product-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;border-top:1px solid var(--line);padding-top:16px}
.product-meta{display:flex;gap:8px;flex-wrap:wrap}
.meta-chip{font-size:12.5px;color:var(--ink-2);border:1px solid var(--line);padding:3px 10px;border-radius:6px}

/* ---------- 特色四宫格 ---------- */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px}
.feature-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.feature-card h3{font-size:17px;margin:0 0 8px;color:var(--accent-2)}
.feature-card p{margin:0;color:var(--ink-2);font-size:14.5px}

/* ---------- 简介两栏 ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.split h2{font-size:clamp(24px,3vw,30px);margin:0 0 16px}
.split p{color:var(--ink-2);margin:0 0 14px}
.split-list{list-style:none;display:grid;gap:10px;margin-top:6px}
.split-list li{position:relative;padding-left:22px;color:var(--ink)}
.split-list li::before{content:"";position:absolute;left:2px;top:9px;width:8px;height:8px;border-radius:50%;background:var(--accent)}

/* ---------- CTA 横幅 ---------- */
.cta{background:linear-gradient(120deg,var(--accent),var(--accent-2));color:#fff;
  border-radius:var(--radius);padding:44px;text-align:center;position:relative;overflow:hidden}
.cta h2{font-size:clamp(22px,3vw,28px);margin:0 0 8px}
.cta p{margin:0 0 22px;color:#d4ece5;opacity:.95}
.cta .btn{font-size:16px;padding:14px 32px}

/* ---------- 联系列表 ---------- */
.contact-list{list-style:none;display:grid;gap:14px;max-width:440px;margin:0}
.contact-list li{display:flex;align-items:center;gap:16px;background:var(--card);
  border:1px solid var(--line);border-radius:12px;padding:15px 18px;font-size:15px}
.contact-label{flex:0 0 62px;color:var(--accent-2);font-weight:600}

/* ---------- 软件介绍（详情页） ---------- */
.intro-block{max-width:860px;margin:0 auto 36px}
.intro-block h3{font-size:19px;margin:0 0 12px;padding-left:14px;border-left:4px solid var(--accent)}
.intro-block p{margin:0;color:var(--ink-2);font-size:15px}
.intro-list{list-style:none;display:grid;gap:8px}
.intro-list li{position:relative;padding-left:20px;color:var(--ink-2);font-size:15px}
.intro-list li::before{content:"";position:absolute;left:2px;top:9px;width:7px;height:7px;border-radius:50%;background:var(--accent)}
.intro-cols{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.intro-col{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:22px}
.intro-col h4{margin:0 0 10px;font-size:15px;color:var(--accent-2)}
.product-banner{display:flex;gap:34px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.product-banner .shot-frame{flex:1;min-width:300px;border:none}
.product-banner .pb-info{max-width:420px}
.product-banner h1{font-size:clamp(26px,3.6vw,38px);margin:0 0 14px}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--dark);color:#93a7a4;padding:38px 0 30px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px;padding-bottom:26px;border-bottom:1px solid rgba(255,255,255,.08)}
.footer-brand{color:#e9f1ee;font-weight:700;font-size:17px;margin:0 0 8px}
.footer-desc{font-size:13.5px;margin:0;max-width:320px}
.footer-col h4{color:#dfe9e7;font-size:14px;margin:0 0 12px}
.footer-col a{display:block;font-size:13.5px;color:#93a7a4;margin-bottom:8px}
.footer-col a:hover{color:#fff}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;padding-top:22px}
.footer-copy{font-size:13px;margin:0}
.footer-icp{font-size:13px;color:#a9bfbb}.footer-icp:hover{color:#fff}

/* ---------- 滚动显示（fail-open） ---------- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:translateY(0)}

/* ---------- 响应式 ---------- */
@media (max-width:820px){
  .nav{gap:2px}
  .nav-wrap{gap:14px}
  .nav-link{padding:8px 9px;font-size:14px}
  .split{grid-template-columns:1fr;gap:28px}
  .footer-grid{grid-template-columns:1fr 1fr}
  .product-banner{flex-direction:column;align-items:flex-start}
  .intro-cols{grid-template-columns:1fr}
}
@media (max-width:720px){
  .header-actions{display:none}
  .section{padding:60px 0}
  .page-hero{padding:58px 0 48px}
  .footer-grid{grid-template-columns:1fr}
}
.brand-logo{height:34px;width:34px;object-fit:contain;border-radius:8px;display:inline-block}
.back-link{display:inline-flex;align-items:center;gap:6px;margin-bottom:20px;color:#fff;font-size:13.5px;text-decoration:none;padding:6px 14px;border:1px solid rgba(255,255,255,.4);border-radius:999px;opacity:.92}
.back-link:hover{opacity:1;border-color:#fff;background:rgba(255,255,255,.08)}