/* ============================================================
   全局基础 + 页头 + 页脚
   ============================================================ */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 20px);-webkit-text-size-adjust:100%}
/* 锚点跳转补偿：区块有 --section-pad 顶部内边距，原生定位落在「盒子上沿」，
   会导致内容还压在头部视线下方（主观上“少滚一段”）。
   注意 scroll-padding 与 scroll-margin 是相加关系，故用负的整段内边距
   把定位点从盒子上沿下移到内容起始处，使标题正好位于头部下方 20px。
   同时覆盖点击导航、带 #hash 直达、浏览器前进后退三种场景。 */
section[id]{scroll-margin-top:calc(-1 * var(--section-pad))}
body{
  margin:0;font-family:var(--ff);color:var(--ink-1);background:var(--bg-page);
  font-size:16px;line-height:1.75;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input,textarea,select{font:inherit;color:inherit}
button{cursor:pointer;border:0;background:none}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,h5{margin:0;font-weight:700;line-height:1.3;letter-spacing:.01em}
p{margin:0}
:focus-visible{outline:2px solid var(--brand-green);outline-offset:3px;border-radius:2px}

.skip-link{
  position:absolute;left:-9999px;top:0;z-index:2000;
  background:var(--brand-navy);color:#fff;padding:12px 22px;border-radius:0 0 var(--r-sm) 0;
}
.skip-link:focus{left:0}

.container{width:100%;max-width:var(--w-max);margin-inline:auto;padding-inline:var(--pad-x);position:relative;z-index:1}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ============ 滚动进场 ============ */
.reveal{opacity:0;transform:translateY(34px);transition:opacity .78s var(--ease-out),transform .78s var(--ease-out)}
.reveal.is-in{opacity:1;transform:none}
.reveal[data-d="1"]{transition-delay:.08s}
.reveal[data-d="2"]{transition-delay:.16s}
.reveal[data-d="3"]{transition-delay:.24s}
.reveal[data-d="4"]{transition-delay:.32s}
.reveal[data-d="5"]{transition-delay:.4s}
.reveal[data-d="6"]{transition-delay:.48s}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  *{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
}

/* ============ 页头 ============ */
.header{
  position:fixed;inset:0 0 auto 0;z-index:1000;height:var(--header-h);
  display:flex;align-items:center;
  transition:background var(--t),box-shadow var(--t),height var(--t),border-color var(--t);
  border-bottom:1px solid transparent;
}
.header::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:var(--grad-hair-dark);opacity:0;transition:opacity var(--t);
}
.header.is-scrolled{
  height:calc(var(--header-h) - 10px);
  background:rgba(255,255,255,.94);
  backdrop-filter:saturate(180%) blur(18px);
  -webkit-backdrop-filter:saturate(180%) blur(18px);
  box-shadow:0 4px 24px rgba(14,21,51,.07);
}
.header.is-scrolled::after{opacity:1}
.header__inner{display:flex;align-items:center;gap:40px;width:100%;max-width:var(--w-max);margin-inline:auto;padding-inline:var(--pad-x)}

/* Logo 双版本切换 */
.brand{display:flex;align-items:center;flex:none}
.brand__logos{position:relative;display:block;width:150px;height:44px}
.brand__logos img{
  position:absolute;inset:0;width:100%;height:100%;object-fit:contain;object-position:left center;
  transition:opacity var(--t);
}
.brand__logos .on-dark{opacity:1}
.brand__logos .on-light{opacity:0}
.header.is-scrolled .brand__logos .on-dark{opacity:0}
.header.is-scrolled .brand__logos .on-light{opacity:1}
.brand:hover .brand__logos img{transform:scale(1.03)}
.brand__logos img{transition:opacity var(--t),transform var(--t-fast)}

/* 主导航 */
.nav{flex:1;min-width:0}
.nav__list{display:flex;justify-content:flex-end;align-items:center;gap:4px}
.nav__list a{
  position:relative;display:block;padding:10px 16px;font-size:15.5px;font-weight:500;
  color:rgba(255,255,255,.86);letter-spacing:.02em;border-radius:var(--r-sm);
  transition:color var(--t-fast),background var(--t-fast);
  white-space:nowrap;
}
.nav__list a::after{
  content:"";position:absolute;left:50%;bottom:2px;width:0;height:2px;
  background:var(--brand-green);border-radius:2px;
  transform:translateX(-50%);transition:width var(--t-fast);
}
.nav__list a:hover{color:#fff;background:rgba(255,255,255,.10)}
.nav__list a.is-active{color:#fff;font-weight:600}
.nav__list a.is-active::after{width:22px}
.header.is-scrolled .nav__list a{color:var(--ink-2)}
.header.is-scrolled .nav__list a:hover{color:var(--brand-navy);background:rgba(20,28,91,.05)}
.header.is-scrolled .nav__list a.is-active{color:var(--brand-navy)}
.header.is-scrolled .nav__list a::after{background:var(--grad-green)}

.header__tel{
  display:flex;align-items:center;gap:9px;flex:none;
  font-family:var(--ff-num);font-size:17px;font-weight:700;letter-spacing:.04em;
  color:#fff;padding:11px 20px;border-radius:var(--r-sm);
  border:1px solid rgba(255,255,255,.34);
  background:rgba(255,255,255,.08);
  transition:background var(--t-fast),border-color var(--t-fast),color var(--t-fast);
  white-space:nowrap;
}
.header__tel svg{width:17px;height:17px;flex:none}
.header__tel:hover{background:rgba(255,255,255,.16);border-color:var(--brand-green)}
.header.is-scrolled .header__tel{
  color:#fff;border-color:transparent;background:var(--grad-brand);box-shadow:var(--sh-brand);
}
.header.is-scrolled .header__tel:hover{filter:brightness(1.1)}

/* 内页页头：始终白底 + 深字 logo（不使用滚动切换机制） */
.header--inner{
  position:sticky;top:0;height:var(--header-h);
  background:rgba(255,255,255,.94);
  backdrop-filter:saturate(180%) blur(18px);
  -webkit-backdrop-filter:saturate(180%) blur(18px);
  box-shadow:0 4px 24px rgba(14,21,51,.07);
}
.header--inner::after{opacity:1}
.header--inner .brand__logos .on-dark{opacity:0}
.header--inner .brand__logos .on-light{opacity:1}
.header--inner .nav__list a{color:var(--ink-2)}
.header--inner .nav__list a:hover{color:var(--brand-navy);background:rgba(20,28,91,.05)}
.header--inner .nav__list a.is-active{color:var(--brand-navy)}
.header--inner .nav__list a::after{background:var(--grad-green)}
.header--inner .header__tel{
  color:#fff;border-color:transparent;background:var(--grad-brand);box-shadow:var(--sh-brand);
}
.header--inner .header__tel:hover{filter:brightness(1.1)}

/* 移动端菜单按钮（PC 端隐藏） */
.nav__toggle{display:none}

/* ============ 页脚 ============ */
.footer{background:var(--bg-dark-2);color:rgba(255,255,255,.66);position:relative;overflow:hidden}
.footer::before{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(900px 420px at 12% 0%,rgba(43,73,216,.30),transparent 62%),
    radial-gradient(760px 380px at 92% 108%,rgba(143,198,63,.18),transparent 60%);
  pointer-events:none;
}
.footer::after{
  content:"";position:absolute;inset:0;background:var(--tech-grid-dark);
  -webkit-mask-image:radial-gradient(circle at 50% 40%,#000,transparent 78%);
  mask-image:radial-gradient(circle at 50% 40%,#000,transparent 78%);
  opacity:.5;pointer-events:none;
}
.footer__main{position:relative;z-index:1;padding:72px 0 52px;display:grid;grid-template-columns:1.25fr 1fr 1fr 1.1fr;gap:52px}
.footer .brand{margin-bottom:20px}
.footer .brand__logos{width:158px}
.footer__desc{font-size:14.5px;line-height:1.9;max-width:330px;color:rgba(255,255,255,.56)}
.footer__tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:24px}
.footer__tags span{
  font-size:12.5px;padding:5px 12px;border-radius:var(--r-xs);
  border:1px solid var(--line-on-dark);color:rgba(255,255,255,.62);background:rgba(255,255,255,.04);
}
.footer__ct{display:flex;align-items:center;gap:10px;font-size:19px;font-weight:700;letter-spacing:.02em;color:#fff;margin-bottom:6px}
.footer__ct svg{width:17px;height:17px;flex:none;color:var(--brand-green)}
.footer__ct a{transition:color var(--t-fast)}
.footer__ct a:hover{color:var(--brand-green-2)}
.fcol__h{font-size:15.5px;font-weight:700;color:#fff;margin-bottom:20px;letter-spacing:.04em}
.fcol li+li{margin-top:12px}
.fcol a{font-size:14.5px;color:rgba(255,255,255,.56);transition:color var(--t-fast);display:inline-flex;align-items:center;gap:7px}
.fcol a::before{content:"";width:0;height:1px;background:var(--brand-green);transition:width var(--t-fast)}
.fcol a:hover{color:#fff}
.fcol a:hover::before{width:12px}
.fcol__li{display:flex;gap:11px;font-size:14.5px;line-height:1.8;color:rgba(255,255,255,.56)}
.fcol__li svg{width:16px;height:16px;flex:none;margin-top:5px;color:var(--brand-green)}
.footer__qr{display:flex;gap:14px;margin-top:6px}
.footer__qr figure{text-align:center;flex:none}
.footer__qr img{
  width:92px;height:auto;aspect-ratio:1/1;object-fit:contain;
  background:#fff;padding:7px;border-radius:var(--r-sm);
  box-shadow:0 6px 20px rgba(0,0,0,.3);
}
.footer__qr figcaption{font-size:12px;color:rgba(255,255,255,.5);margin-top:8px}
.footer__bottom{
  position:relative;z-index:1;border-top:1px solid var(--line-on-dark);
  padding:22px 0;display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;
  font-size:13.5px;color:rgba(255,255,255,.42);
}
.footer__legal{display:flex;flex-wrap:wrap;gap:8px 22px}
.footer__legal a{transition:color var(--t-fast)}
.footer__legal a:hover{color:var(--brand-green-2)}
.footer__icp a{color:inherit}

/* 返回顶部 */
.totop{
  position:fixed;right:32px;bottom:32px;z-index:900;
  width:48px;height:48px;border-radius:var(--r-md);
  display:grid;place-items:center;color:#fff;
  background:var(--grad-brand);box-shadow:var(--sh-brand);
  opacity:0;visibility:hidden;transform:translateY(14px);
  transition:opacity var(--t),transform var(--t),visibility var(--t);
}
.totop.is-show{opacity:1;visibility:visible;transform:none}
.totop:hover{filter:brightness(1.12)}
.totop svg{width:20px;height:20px}

/* ============ 通用按钮 ============ */
.btn{
  display:inline-flex;align-items:center;gap:11px;
  padding:15px 32px;font-size:16px;font-weight:600;letter-spacing:.04em;
  border-radius:var(--r-sm);position:relative;overflow:hidden;
  transition:transform var(--t-fast),box-shadow var(--t-fast),background var(--t-fast),color var(--t-fast),border-color var(--t-fast);
  border:1px solid transparent;
}
.btn svg{width:17px;height:17px;flex:none;transition:transform var(--t-fast)}
.btn:hover svg{transform:translateX(4px)}
.btn--primary{color:#fff;background:var(--grad-brand);box-shadow:var(--sh-brand);border-color:rgba(255,255,255,.14)}
.btn--primary::after{
  content:"";position:absolute;top:0;left:-120%;width:60%;height:100%;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.24),transparent);
  transform:skewX(-20deg);transition:left .62s var(--ease-out);
}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 18px 40px rgba(20,28,91,.30)}
.btn--primary:hover::after{left:130%}
.btn--green{color:var(--brand-navy-3);background:var(--grad-green);box-shadow:var(--sh-green);font-weight:700}
.btn--green:hover{transform:translateY(-2px);box-shadow:0 16px 36px rgba(111,158,34,.38)}
.btn--ghost{color:#fff;border-color:rgba(255,255,255,.34);background:rgba(255,255,255,.06)}
.btn--ghost:hover{background:rgba(255,255,255,.14);border-color:var(--brand-green)}
.btn--outline{color:#fff;background:var(--brand-green-dark);border-color:rgba(255,255,255,.16);box-shadow:0 10px 26px rgba(110,158,34,.34)}
.btn--outline:hover{border-color:var(--brand-navy);background:var(--brand-navy);color:#fff}
.btn--sm{padding:11px 24px;font-size:14.5px}

@media (max-width:1440px){
  .footer__main{grid-template-columns:1.2fr 1fr 1fr 1.05fr;gap:40px}
  .nav__list a{padding:10px 12px;font-size:15px}
  .header__inner{gap:28px}
}