@charset "utf-8";
/* =========================================================
   SKYLINE · 深黑工业科技风企业模板
   Design System / Layout / Components
   作者：模板设计 · 配色 电光青 + 钛黄
   ========================================================= */

/* ---------- 字体 ---------- */
@font-face{
  font-family:'Saira';
  src:local('Saira SemiCondensed'),local('Saira');
  font-display:swap;
}

/* ---------- 设计变量 ---------- */
:root{
  /* 主色 */
  --bg:#0a0e14;            /* 主背景 近黑 */
  --bg-soft:#0d1620;       /* 次级背景 */
  --surface:#111824;       /* 卡片表面 */
  --surface-2:#161f2e;     /* 卡片表面更亮 */
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(255,255,255,.16);

  /* 文字 */
  --text:#e8edf4;          /* 主文字 */
  --text-soft:#9fb0c3;     /* 次文字 */
  --text-dim:#5e6f84;      /* 弱文字 */

  /* 强调 */
  --cyan:#00e5d4;          /* 电光青 */
  --cyan-dim:#0bbfb2;
  --gold:#ffb800;          /* 钛黄 */
  --gold-dim:#e0a000;

  /* 渐变 */
  --grad-cyan:linear-gradient(135deg,#00e5d4 0%,#1f9bff 100%);
  --grad-dark:linear-gradient(180deg,#0d131c 0%,#0a0e14 100%);
  --grad-line:linear-gradient(90deg,transparent,var(--cyan),transparent);

  /* 阴影 */
  --shadow:0 20px 60px -20px rgba(0,0,0,.7);
  --shadow-cyan:0 0 0 1px rgba(0,229,212,.2),0 18px 50px -18px rgba(0,229,212,.35);

  /* 尺寸 */
  --wrap:1320px;
  --radius:14px;
  --radius-lg:22px;
  --header-h:84px;

  --ff-display:'Saira','Oswald','Barlow Condensed',-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --ff-body:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --ff-mono:'JetBrains Mono','SFMono-Regular',Consolas,monospace;
}

/* ---------- Reset ---------- */
*{margin:0;padding:0;box-sizing:border-box}
html{font-size:16px;-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  font-family:var(--ff-body);
  background:var(--bg);
  color:var(--text);
  line-height:1.7;
  font-size:15px;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none;transition:color .25s}
a:hover{color:var(--cyan)}
ul,ol,li{list-style:none}
img{max-width:100%;display:block;border:0}
button,input,textarea,select{font-family:inherit;font-size:inherit;color:inherit;outline:none}
table{border-collapse:collapse;width:100%}
h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.2;font-family:var(--ff-display)}
::selection{background:var(--cyan);color:#04221f}

/* 滚动条 */
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:#070a0f}
::-webkit-scrollbar-thumb{background:#23303f;border-radius:6px}
::-webkit-scrollbar-thumb:hover{background:var(--cyan-dim)}

/* 无障碍 */
.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
a.visually-hidden:focus{position:fixed;top:10px;left:10px;width:auto;height:auto;clip:auto;padding:10px 18px;background:var(--cyan);color:#04221f;z-index:9999;border-radius:8px}

/* ---------- 通用容器 ---------- */
.wrap{width:92%;max-width:var(--wrap);margin:0 auto}
.sec{position:relative;padding:120px 0}
.sec-sm{padding:80px 0}

/* 区块小标题 */
.sec-head{margin-bottom:60px;position:relative}
.sec-head .eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--ff-display);
  letter-spacing:.28em;text-transform:uppercase;
  font-size:13px;color:var(--cyan);font-weight:600;
  margin-bottom:18px;
}
.sec-head .eyebrow::before{content:"";width:34px;height:2px;background:var(--cyan)}
.sec-head h2{
  font-size:clamp(30px,4vw,52px);
  letter-spacing:-.01em;color:#fff;
}
.sec-head h2 b{color:var(--cyan);font-weight:700}
.sec-head .sub{margin-top:16px;color:var(--text-soft);max-width:620px;font-size:16px}
.sec-head.center{text-align:center}
.sec-head.center .eyebrow{justify-content:center}
.sec-head.center .sub{margin-left:auto;margin-right:auto}

/* 按钮 */
.btn{
  display:inline-flex;align-items:center;gap:12px;
  padding:15px 30px;border-radius:50px;
  font-family:var(--ff-display);font-weight:600;letter-spacing:.04em;
  font-size:15px;cursor:pointer;border:1px solid transparent;
  transition:.3s;position:relative;overflow:hidden;
  background:transparent;line-height:1.2;text-align:center;
}
.btn .ar{transition:transform .3s}
.btn:hover .ar{transform:translateX(5px)}
.btn-primary{background:var(--cyan);color:#04221f}
.btn-primary:hover{background:#fff;color:#04221f;box-shadow:var(--shadow-cyan)}
.btn-ghost{background:transparent;border-color:var(--line-strong);color:var(--text)}
.btn-ghost:hover{background:transparent;border-color:var(--cyan);color:var(--cyan)}

/* 背景网格氛围 */
.grid-bg{
  position:absolute;inset:0;z-index:0;pointer-events:none;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:64px 64px;
  -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 0%,#000 30%,transparent 75%);
  mask-image:radial-gradient(ellipse 80% 60% at 50% 0%,#000 30%,transparent 75%);
  opacity:.5;
}
.glow{position:absolute;border-radius:50%;filter:blur(120px);opacity:.22;pointer-events:none;z-index:0}
.glow.c{background:var(--cyan)}
.glow.g{background:var(--gold)}

/* ====================== HEADER ====================== */
.site-header{
  position:fixed;top:0;left:0;width:100%;z-index:1000;
  height:var(--header-h);
  display:flex;align-items:center;
  transition:.4s;
}
.site-header::before{
  content:"";position:absolute;inset:0;z-index:-1;
  background:rgba(10,14,20,0);
  backdrop-filter:blur(0);
  border-bottom:1px solid transparent;
  transition:.4s;
}
.site-header.scrolled{height:70px}
.site-header.scrolled::before{
  background:rgba(10,14,20,.85);
  backdrop-filter:blur(18px);
  border-bottom:1px solid var(--line);
}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;width:94%;max-width:1480px}
.logo{display:flex;align-items:center;gap:12px;font-family:var(--ff-display)}
.logo img{height:42px;width:auto}
.logo .ltxt strong{display:block;font-size:20px;color:#fff;letter-spacing:.02em;line-height:1.1}
.logo .ltxt span{font-size:11px;letter-spacing:.22em;color:var(--cyan);text-transform:uppercase}

/* 主导航 */
.main-nav>ul{display:flex;align-items:center;gap:6px}
.main-nav>ul>li{position:relative}
.main-nav>ul>li>a{
  display:flex;align-items:center;padding:0 20px;height:var(--header-h);
  font-family:var(--ff-display);font-size:16px;font-weight:500;letter-spacing:.02em;
  color:var(--text-soft);position:relative;transition:.3s;
}
.site-header.scrolled .main-nav>ul>li>a{height:70px}
.main-nav>ul>li>a::after{
  content:"";position:absolute;left:20px;right:20px;bottom:24px;height:2px;
  background:var(--cyan);transform:scaleX(0);transform-origin:left;transition:transform .3s;
}
.main-nav>ul>li:hover>a,.main-nav>ul>li.active>a{color:#fff}
.main-nav>ul>li:hover>a::after,.main-nav>ul>li.active>a::after{transform:scaleX(1)}
/* 下拉 */
.main-nav .sub{
  position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(12px);
  min-width:200px;background:rgba(17,24,36,.96);backdrop-filter:blur(20px);
  border:1px solid var(--line);border-radius:14px;padding:10px;
  opacity:0;visibility:hidden;transition:.3s;box-shadow:var(--shadow);
}
.main-nav>ul>li:hover .sub{opacity:1;visibility:visible;transform:translateX(-50%) translateY(6px)}
.main-nav .sub a{display:block;padding:11px 16px;border-radius:9px;font-size:14px;color:var(--text-soft)}
.main-nav .sub a:hover{background:var(--surface-2);color:var(--cyan)}

.header-cta{display:flex;align-items:center;gap:18px}
.header-tel{display:flex;align-items:center;gap:10px;font-family:var(--ff-display);font-size:18px;color:#fff;font-weight:600}
.header-tel i{width:34px;height:34px;border-radius:50%;border:1px solid var(--cyan);display:grid;place-items:center;color:var(--cyan)}
.header-tel i svg{width:16px;height:16px}

/* 汉堡 */
.nav-toggle{display:none;width:44px;height:44px;border:1px solid var(--line-strong);border-radius:10px;background:none;cursor:pointer;flex-direction:column;justify-content:center;align-items:center;gap:5px}
.nav-toggle span{width:20px;height:2px;background:#fff;transition:.3s;border-radius:2px}
.nav-toggle.on span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.on span:nth-child(2){opacity:0}
.nav-toggle.on span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ====================== FOOTER ====================== */
.site-footer{position:relative;background:#070a0f;border-top:1px solid var(--line);z-index:10}
.site-footer .fglow{position:absolute;top:0;right:0;width:460px;height:300px;max-width:50%;background:var(--cyan);filter:blur(160px);opacity:.1;pointer-events:none;z-index:0}
.footer-top{padding:80px 0 50px;display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:50px;position:relative;z-index:1}
.footer-brand .logo{margin-bottom:22px}
.footer-brand p{color:var(--text-soft);font-size:14px;max-width:300px;margin-bottom:24px}
.footer-brand .socials{display:flex;gap:12px}
.footer-brand .socials a,.footer-brand .socials .qr-trigger{width:40px;height:40px;border-radius:10px;border:1px solid var(--line);display:grid;place-items:center;color:var(--text-soft);transition:.3s;cursor:pointer;position:relative}
.footer-brand .socials a:hover,.footer-brand .socials .qr-trigger:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-3px)}
.footer-brand .socials svg{width:20px;height:20px}
/* 二维码 hover 弹层 */
.qr-pop{position:absolute;bottom:calc(100% + 14px);left:50%;transform:translateX(-50%) translateY(8px) scale(.95);background:#fff;border-radius:12px;padding:10px;width:140px;opacity:0;visibility:hidden;transition:.28s;box-shadow:0 16px 40px rgba(0,0,0,.5);z-index:950}
.qr-pop::after{content:"";position:absolute;top:100%;left:50%;transform:translateX(-50%);border:8px solid transparent;border-top-color:#fff}
.qr-pop img{width:120px;height:120px;display:block;border-radius:6px}
.qr-pop em{display:block;text-align:center;color:#0a0e14;font-size:12px;font-style:normal;margin-top:6px;font-family:var(--ff-display)}
.qr-trigger:hover .qr-pop{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0) scale(1)}
.fcol h4{font-size:16px;color:#fff;margin-bottom:22px;font-family:var(--ff-display);letter-spacing:.04em}
.fcol h4::after{content:"";display:block;width:26px;height:2px;background:var(--cyan);margin-top:10px}
.fcol ul li{margin-bottom:13px}
.fcol ul li a{color:var(--text-soft);font-size:14px}
.fcol ul li a:hover{color:var(--cyan);padding-left:5px}
.fcontact li{display:flex;gap:12px;margin-bottom:16px;color:var(--text-soft);font-size:14px;align-items:flex-start}
.fcontact li svg{width:18px;height:18px;color:var(--cyan);flex-shrink:0;margin-top:2px}
.fcontact .ewm{margin-top:18px}
.fcontact .ewm img{width:104px;height:104px;border-radius:10px;border:1px solid var(--line);padding:6px;background:#fff}
.footer-bottom{border-top:1px solid var(--line);padding:24px 0;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;position:relative;z-index:1}
.footer-bottom p,.footer-bottom a{color:var(--text-dim);font-size:13px}
.footer-bottom .links a{margin-left:18px}
.footer-bottom .links a:hover{color:var(--cyan)}

/* 返回顶部 */
.to-top{position:fixed;right:30px;bottom:30px;width:48px;height:48px;border-radius:12px;background:var(--surface-2);border:1px solid var(--line-strong);display:grid;place-items:center;color:var(--cyan);cursor:pointer;opacity:0;visibility:hidden;transform:translateY(20px);transition:.35s;z-index:900}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--cyan);color:#04221f}

/* ---------- 进入视口动画（reveal）---------- */
.reveal{opacity:0;transform:translateY(38px);transition:opacity .8s cubic-bezier(.16,1,.3,1),transform .8s cubic-bezier(.16,1,.3,1)}
.reveal.in{opacity:1;transform:none}
/* 首屏内容用纯 CSS 入场动画，不依赖 JS/IntersectionObserver，确保加载即可见 */
.hero .reveal{animation:heroIn .9s cubic-bezier(.16,1,.3,1) forwards}
.hero .reveal.d1{animation-delay:.12s}
.hero .reveal.d2{animation-delay:.24s}
.hero .reveal.d3{animation-delay:.36s}
.hero .reveal.d4{animation-delay:.48s}
@keyframes heroIn{from{opacity:0;transform:translateY(38px)}to{opacity:1;transform:none}}
.reveal.d1{transition-delay:.1s}
.reveal.d2{transition-delay:.2s}
.reveal.d3{transition-delay:.3s}
.reveal.d4{transition-delay:.4s}
.reveal.d5{transition-delay:.5s}
.reveal.left{transform:translateX(-40px)}
.reveal.left.in{transform:none}
.reveal.right{transform:translateX(40px)}
.reveal.right.in{transform:none}
.reveal.zoom{transform:scale(.92);opacity:0}
.reveal.zoom.in{transform:none;opacity:1}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1!important;transform:none!important;transition:none!important;animation:none!important}
  .hero .reveal{opacity:1!important;transform:none!important;animation:none!important}
  *{scroll-behavior:auto!important}
}