/* ============================================================
   铁锚科技 · 共享设计系统（Apple 官网风格）
   纯白/#F5F5F7 交替 · #0071E3 唯一彩色 · SF Pro 字体栈
   ============================================================ */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --ink:#1D1D1F;--ink-2:#6E6E73;--ink-3:#86868B;
  --line:#D2D2D7;--gray:#F5F5F7;--gray-2:#FAFAFC;--white:#fff;
  --blue:#0071E3;--blue-hover:#0066CC;
  --pill:980px;--radius:20px;--radius-img:24px;
  --shadow-card:0 2px 14px rgba(0,0,0,.05);--shadow-card-hover:0 6px 24px rgba(0,0,0,.08);
  --ease:cubic-bezier(.4,0,.2,1);
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Helvetica Neue","PingFang SC","Microsoft YaHei",sans-serif;
}
html{scroll-behavior:smooth}
body{font-family:var(--font);font-size:17px;color:var(--ink);background:var(--white);
  -webkit-font-smoothing:antialiased;line-height:1.62;letter-spacing:.01em}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul{list-style:none}
.wrap{max-width:1240px;margin:0 auto;padding:0 28px}
section{padding:110px 0}
@media(max-width:700px){section{padding:72px 0}}

/* ---------- 导航 ---------- */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;height:56px;
  background:rgba(255,255,255,.82);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid transparent;transition:border-color .4s var(--ease)}
.nav.scrolled{border-bottom-color:var(--line)}
.nav-inner{max-width:1240px;margin:0 auto;padding:0 28px;height:56px;display:flex;align-items:center;gap:36px}
.brand{display:flex;align-items:center;flex-shrink:0}
.brand img{height:34px;width:auto}
.menu{display:flex;align-items:center;gap:6px;margin:0 auto}
.menu>li{position:relative}
.menu>li>a{display:block;padding:9px 14px;font-size:14px;color:var(--ink);border-radius:8px;
  transition:color .3s var(--ease),background .3s var(--ease)}
.menu>li>a:hover{color:var(--blue)}
.menu>li.active>a{color:var(--blue);font-weight:600}
.dropdown{position:absolute;top:calc(100% + 6px);left:50%;transform:translateX(-50%) translateY(6px);
  min-width:230px;background:rgba(255,255,255,.96);backdrop-filter:blur(20px);border-radius:16px;
  box-shadow:0 8px 32px rgba(0,0,0,.12);padding:10px;opacity:0;visibility:hidden;
  transition:opacity .3s var(--ease),transform .3s var(--ease),visibility .3s}
.menu>li:hover .dropdown{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.dropdown a{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:10px 14px;
  font-size:14px;color:var(--ink);border-radius:10px;white-space:nowrap;transition:background .25s var(--ease),color .25s var(--ease)}
.dropdown a span{font-size:11px;color:var(--ink-3);font-variant-numeric:tabular-nums}
.dropdown a:hover{background:var(--gray);color:var(--blue)}
.nav-right{display:flex;align-items:center;gap:14px;flex-shrink:0}
.nav-cta{font-size:14px;color:var(--ink-2);padding:6px 14px;border-radius:8px;transition:color .3s}
.nav-cta:hover{color:var(--blue)}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.burger i{width:20px;height:1.5px;background:var(--ink);transition:transform .3s var(--ease),opacity .3s}
@media(max-width:1080px){
  .menu{display:none}
  .burger{display:flex}
  .menu.open{display:flex;position:fixed;inset:56px 0 0 0;background:rgba(255,255,255,.98);backdrop-filter:blur(20px);
    flex-direction:column;justify-content:flex-start;align-items:center;gap:2px;padding:40px 20px;z-index:99;overflow:auto}
  .menu.open>li{width:100%;max-width:360px;text-align:center}
  .menu.open>li>a{font-size:18px;padding:13px 20px}
  .menu.open .dropdown{display:none}
  .menu.open>li.sub-open .dropdown{display:block;position:static;transform:none;opacity:1;visibility:visible;
    box-shadow:none;background:transparent;padding:0 0 8px}
  .menu.open>li.sub-open .dropdown a{justify-content:center}
}

/* ---------- 内页 Hero ---------- */
.page-hero{background:var(--gray);padding:150px 0 64px}
.crumb{font-size:13px;color:var(--ink-3);margin-bottom:18px}
.crumb a{color:var(--ink-3);transition:color .3s}
.crumb a:hover{color:var(--blue)}
.crumb em{font-style:normal;color:var(--ink-2)}
.page-hero h1{font-size:clamp(36px,5vw,56px);font-weight:600;letter-spacing:-.02em;line-height:1.08}
.page-hero .desc{margin-top:16px;max-width:640px;font-size:19px;color:var(--ink-2);line-height:1.55}
@media(max-width:700px){.page-hero{padding:118px 0 48px}}

/* ---------- 区块标题 ---------- */
.sec-kicker{display:block;font-size:13px;font-weight:500;color:var(--blue);margin-bottom:12px}
.sec-title{font-size:clamp(30px,4vw,48px);font-weight:600;letter-spacing:-.02em;line-height:1.12}
.sec-desc{margin-top:16px;max-width:640px;font-size:17px;color:var(--ink-2);line-height:1.6}
.sec-head{margin-bottom:52px}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 26px;border-radius:var(--pill);background:var(--blue);color:#fff;
  font-size:17px;font-weight:500;border:none;cursor:pointer;transition:background .3s var(--ease)}
.btn:hover{background:var(--blue-hover)}
.btn .arr{transition:transform .3s var(--ease)}
.btn:hover .arr{transform:translateX(3px)}
.btn-ghost{display:inline-flex;align-items:center;gap:6px;padding:11px 24px;border-radius:var(--pill);
  border:1px solid var(--line);background:transparent;color:var(--ink);font-size:15px;transition:border-color .3s,color .3s}
.btn-ghost:hover{border-color:var(--blue);color:var(--blue)}
.link-arrow{display:inline-flex;align-items:center;gap:5px;font-size:17px;color:var(--blue);transition:color .3s var(--ease)}
.link-arrow:hover{color:var(--blue-hover);text-decoration:underline;text-underline-offset:4px}
.link-arrow span{font-size:19px;line-height:1;transition:transform .3s var(--ease)}
.link-arrow:hover span{transform:translateX(2px)}

/* ---------- 卡片 ---------- */
.card{background:var(--white);border-radius:var(--radius);box-shadow:0 2px 14px rgba(0,0,0,.05);
  transition:box-shadow .4s var(--ease),transform .4s var(--ease)}
.card:hover{box-shadow:0 6px 26px rgba(0,0,0,.09);transform:translateY(-2px)}

/* ---------- 数据表 ---------- */
.tbl{width:100%;border-collapse:collapse;font-size:15px}
.tbl th{text-align:left;font-weight:500;color:var(--ink-2);padding:14px 16px;border-bottom:1px solid var(--line);white-space:nowrap}
.tbl td{padding:16px;border-bottom:1px solid var(--line);color:var(--ink);vertical-align:top}
.tbl tr:hover td{background:var(--gray-2)}

/* ---------- 文章正文 ---------- */
.prose{max-width:760px}
.prose p{margin-bottom:18px;color:var(--ink-2);line-height:1.75}
.prose p strong{color:var(--ink);font-weight:600}
.prose h3{font-size:21px;font-weight:600;margin:34px 0 14px;letter-spacing:-.01em}
.prose ul{margin:0 0 18px 4px}
.prose ul li{position:relative;padding:5px 0 5px 22px;color:var(--ink-2);line-height:1.7}
.prose ul li::before{content:"";position:absolute;left:2px;top:15px;width:6px;height:6px;border-radius:50%;background:var(--blue)}

/* ---------- 页脚 ---------- */
.foot{background:var(--gray);padding:64px 0 36px;font-size:13px;color:var(--ink-2)}
.foot-grid{display:grid;grid-template-columns:1.4fr repeat(4,1fr);gap:40px;padding-bottom:40px;border-bottom:1px solid var(--line)}
.foot h5{font-size:13px;font-weight:600;color:var(--ink);margin-bottom:14px}
.foot li{margin-bottom:9px}
.foot a{color:var(--ink-2);transition:color .3s}
.foot a:hover{color:var(--blue)}
.foot-info p{margin-bottom:8px;line-height:1.6}
.foot-bottom{display:flex;flex-wrap:wrap;gap:12px 28px;justify-content:space-between;padding-top:24px;font-size:12px;color:var(--ink-3)}
@media(max-width:1080px){.foot-grid{grid-template-columns:1fr 1fr 1fr}}
@media(max-width:700px){.foot-grid{grid-template-columns:1fr 1fr}}

/* ---------- 动效 ---------- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}

/* ---------- 回到顶部 ---------- */
.toTop{position:fixed;right:26px;bottom:26px;width:44px;height:44px;border-radius:50%;border:none;cursor:pointer;
  background:rgba(29,29,31,.72);color:#fff;font-size:17px;display:flex;align-items:center;justify-content:center;
  opacity:0;visibility:hidden;transition:opacity .4s var(--ease),visibility .4s;z-index:90}
.toTop.show{opacity:1;visibility:visible}
.toTop:hover{background:rgba(29,29,31,.9)}