/* ===== GO谷歌安装器官网 · 纯蓝主题样式系统 ===== */
:root{
  --blue:#2F6BFF;
  --blue-600:#1E54E0;
  --blue-700:#1742B8;
  --blue-50:#EFF4FF;
  --blue-100:#DBE6FF;
  --ink:#16203A;
  --ink-2:#46506B;
  --ink-3:#7A8499;
  --bg:#FFFFFF;
  --bg-soft:#F6F8FC;
  --line:#E6EAF2;
  --radius:16px;
  --radius-sm:10px;
  --shadow:0 10px 30px rgba(24,47,107,.08);
  --shadow-blue:0 12px 28px rgba(47,107,255,.22);
  --max:1120px;
  --header-h:64px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--ink);
  background-color:var(--bg);
  line-height:1.75;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
/* 背景光晕：用 body background-image，避免伪元素创建堆叠上下文 */
body{
  background-image:radial-gradient(1100px 520px at 50% -160px, rgba(47,107,255,.10), transparent 62%);
  background-repeat:no-repeat;
  background-attachment:fixed;
}
img{max-width:100%;display:block}
a{color:var(--blue-600);text-decoration:none}
a:hover{color:var(--blue-700)}

/* ===== 布局 ===== */
.container{max-width:var(--max);margin:0 auto;padding:0 20px}
.section{padding:84px 0}
.section.soft{background:var(--bg-soft)}
.section-head{max-width:720px;margin:0 auto 48px;text-align:center}
.section-head h2{font-size:32px;line-height:1.3;margin:0 0 12px;letter-spacing:-.01em}
.section-head p{color:var(--ink-2);margin:0;font-size:17px}
.lead{font-size:18px;color:var(--ink-2)}
.muted{color:var(--ink-3)}
.text-center{text-align:center}
.pill{display:inline-block;font-size:13px;font-weight:600;color:var(--blue-700);background:var(--blue-50);border:1px solid var(--blue-100);padding:5px 14px;border-radius:999px;letter-spacing:.02em}

/* ===== 头部 / 导航 ===== */
.site-header{
  position:fixed;top:0;left:0;right:0;height:var(--header-h);
  background:rgba(255,255,255,.86);backdrop-filter:saturate(160%) blur(10px);
  border-bottom:1px solid var(--line);z-index:100;
}
.site-header.scrolled{box-shadow:0 6px 20px rgba(24,47,107,.06)}
.nav{height:var(--header-h);display:flex;align-items:center;gap:18px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--ink)}
.brand-mark{
  width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--blue),var(--blue-700));
  color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;font-size:15px;letter-spacing:.02em;
  box-shadow:var(--shadow-blue);
}
.brand-name{font-size:17px}
.brand-logo{width:44px;height:44px;border-radius:11px;object-fit:cover;display:block;}
.nav-links{margin-left:auto;display:flex;gap:6px;align-items:center}
.nav-links a{
  color:var(--ink-2);font-weight:500;padding:8px 14px;border-radius:9px;font-size:15px;
}
.nav-links a:hover{background:var(--blue-50);color:var(--blue-700)}
.nav-links a.active{color:var(--blue-700);background:var(--blue-50);font-weight:600}
.nav-cta{margin-left:6px}
.nav-toggle{
  display:none;margin-left:auto;width:42px;height:42px;border:1px solid var(--line);border-radius:10px;
  background:#fff;color:var(--ink);font-size:20px;cursor:pointer;align-items:center;justify-content:center;
}

/* ===== 按钮 ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:11px;font-weight:600;font-size:15px;cursor:pointer;
  border:1px solid transparent;transition:transform .12s ease,box-shadow .2s ease,background .2s ease;
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--blue);color:#fff;box-shadow:var(--shadow-blue)}
.btn-primary:hover{background:var(--blue-600);color:#fff}
.btn-ghost{background:#fff;color:var(--blue-700);border-color:var(--blue-100)}
.btn-ghost:hover{background:var(--blue-50);color:var(--blue-700)}
.btn-lg{padding:15px 30px;font-size:16px}

/* ===== Hero ===== */
.hero{padding:calc(var(--header-h) + 70px) 0 72px;text-align:center}
.hero .pill{margin-bottom:18px}
.hero h1{font-size:46px;line-height:1.2;margin:0 0 18px;letter-spacing:-.02em}
.hero h1 .hl{color:var(--blue)}
.hero p.lead{max-width:620px;margin:0 auto 30px}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero-phones{
  display:flex;gap:20px;justify-content:center;align-items:flex-start;margin:46px auto 0;flex-wrap:wrap;
}
.hero-phones .phone{
  width:220px;border-radius:22px;overflow:hidden;background:#fff;border:1px solid var(--line);
  box-shadow:var(--shadow);transition:transform .3s ease,box-shadow .3s ease;
}
.hero-phones .phone:hover{transform:translateY(-6px);box-shadow:0 16px 40px rgba(47,107,255,.15)}
.hero-phones .phone img{width:100%;height:auto;display:block}

/* ===== 卡片网格 ===== */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;
  box-shadow:var(--shadow);transition:transform .18s ease,box-shadow .18s ease;
}
.card:hover{transform:translateY(-4px);box-shadow:0 16px 36px rgba(24,47,107,.12)}
.card .ic{
  width:48px;height:48px;border-radius:12px;background:var(--blue-50);color:var(--blue);
  display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:16px;
}
.card h3{margin:0 0 8px;font-size:20px}
.card p{margin:0;color:var(--ink-2);font-size:15px}
.tag{display:inline-block;font-size:12px;font-weight:700;color:var(--blue-700);background:var(--blue-50);padding:3px 10px;border-radius:7px;margin-bottom:12px}

/* 三件套卡片配色统一为蓝，用深浅区分 */
.tp .ic{background:var(--blue);color:#fff}
.tp:nth-child(2) .ic{background:var(--blue-600)}
.tp:nth-child(3) .ic{background:var(--blue-700)}

/* ===== 步骤条 ===== */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;counter-reset:step}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;position:relative}
.step .num{
  width:38px;height:38px;border-radius:50%;background:var(--blue-50);color:var(--blue-700);
  font-weight:800;display:flex;align-items:center;justify-content:center;margin-bottom:14px;border:1px solid var(--blue-100);
}
.step h4{margin:0 0 6px;font-size:17px}
.step p{margin:0;color:var(--ink-2);font-size:14px}
.step .warn{margin-top:10px;font-size:13px;color:var(--blue-700);background:var(--blue-50);padding:6px 10px;border-radius:8px;display:inline-block}

/* ===== 下载卡片 ===== */
.dl-card{max-width:560px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px;box-shadow:var(--shadow);text-align:center}
.dl-appicon{width:72px;height:72px;border-radius:16px;object-fit:cover;margin:0 auto 14px}
.dl-version{font-size:14px;color:var(--ink-3);margin-bottom:4px}
.dl-title{font-size:26px;margin:0 0 6px}
.dl-meta{display:flex;gap:18px;justify-content:center;flex-wrap:wrap;color:var(--ink-2);font-size:14px;margin:14px 0 22px}
.dl-meta span{display:inline-flex;align-items:center;gap:6px}
/* ===== 二维码弹窗（移动端下载） ===== */
.qr-modal{position:fixed;inset:0;z-index:1000;display:none;align-items:center;justify-content:center;padding:24px}
.qr-modal.show{display:flex}
.qr-modal-backdrop{position:absolute;inset:0;background:rgba(15,23,42,.55)}
.qr-modal-card{position:relative;background:#fff;border-radius:18px;padding:26px 26px 22px;width:300px;max-width:100%;text-align:center;box-shadow:0 20px 60px rgba(15,23,42,.3);animation:qrPop .25s ease}
@keyframes qrPop{from{opacity:0;transform:scale(.92)}to{opacity:1;transform:scale(1)}}
.qr-modal-card img{width:220px;height:220px;max-width:100%;border-radius:12px;margin:0 auto;display:block}
.qr-modal-tip{margin:16px 0 0;font-size:15px;color:var(--ink);font-weight:600}
.qr-modal-close{position:absolute;top:10px;right:10px;width:34px;height:34px;border:none;background:var(--bg-soft);border-radius:50%;cursor:pointer;color:var(--ink-2);display:flex;align-items:center;justify-content:center;font-size:20px;line-height:1}
.qr-modal-close:hover{background:var(--line)}

/* ===== 更新日志 ===== */
.log-center{max-width:720px;margin:0 auto}
.log-item{border-left:3px solid var(--blue-100);padding:0 0 8px 22px;position:relative;margin-bottom:30px}
.log-item::before{content:"";position:absolute;left:-7px;top:6px;width:11px;height:11px;border-radius:50%;background:var(--blue);border:2px solid #fff;box-shadow:0 0 0 2px var(--blue-100)}
.log-ver{font-weight:700;font-size:18px;color:var(--ink)}
.log-date{font-size:13px;color:var(--ink-3);margin-left:10px}
.log-item ul{margin:10px 0 0;padding-left:18px;color:var(--ink-2)}
.log-item li{margin:4px 0}

/* ===== 文档列表 ===== */
.doc-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.doc-card{display:flex;gap:16px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);transition:transform .18s ease,border-color .2s ease}
.doc-card:hover{transform:translateY(-3px);border-color:var(--blue-100)}
.doc-card .ic{width:44px;height:44px;border-radius:11px;background:var(--blue-50);color:var(--blue);display:flex;align-items:center;justify-content:center;font-size:22px;flex:none}
.doc-card h3{margin:0 0 4px;font-size:18px}
.doc-card p{margin:0;color:var(--ink-2);font-size:14px}

/* 文档阅读页 */
.doc-wrap{max-width:820px;margin:0 auto}
.doc-wrap h1{font-size:34px;margin:0 0 10px;letter-spacing:-.01em}
.doc-wrap h2{font-size:24px;margin:38px 0 12px}
.doc-wrap h3{font-size:19px;margin:26px 0 10px}
.doc-wrap p,.doc-wrap li{color:var(--ink-2)}
.doc-wrap ul,.doc-wrap ol{padding-left:22px}
.doc-wrap li{margin:6px 0}
.doc-wrap .note{background:var(--blue-50);border:1px solid var(--blue-100);border-radius:12px;padding:14px 18px;color:var(--blue-700);font-size:15px;margin:18px 0}
.doc-wrap .warn{background:#FFF6F0;border:1px solid #FFD9C2;color:#B54708;border-radius:12px;padding:14px 18px;font-size:15px;margin:18px 0}
.doc-wrap figure{margin:22px auto;text-align:center}
.doc-wrap figure img{max-width:100%;height:auto;display:block;margin:0 auto;border-radius:14px;border:1px solid var(--line);box-shadow:var(--shadow)}
.doc-wrap img{display:block;margin:0 auto}
.doc-wrap figcaption{font-size:13px;color:var(--ink-3);margin-top:8px}
.breadcrumb{font-size:14px;color:var(--ink-3);margin:18px 0 18px}
.breadcrumb a{color:var(--ink-3)}
.breadcrumb a:hover{color:var(--blue-700)}

/* ===== FAQ ===== */
.faq-item{border:1px solid var(--line);border-radius:12px;background:#fff;margin-bottom:12px;overflow:hidden}
.faq-q{width:100%;text-align:left;background:none;border:0;padding:18px 20px;font-size:16px;font-weight:600;color:var(--ink);cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq-q .ar{color:var(--blue);transition:transform .2s ease;flex:none}
.faq-item.open .faq-q .ar{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease}
.faq-a div{padding:0 20px 18px;color:var(--ink-2);font-size:15px}

/* ===== 关于页 ===== */
.about-hero{text-align:center;padding:calc(var(--header-h) + 60px) 0 40px}
.about-hero h1{font-size:38px;margin:0 0 12px}
.about-mission{max-width:760px;margin:0 auto;font-size:18px;color:var(--ink-2)}

/* ===== 页脚 ===== */
.site-footer{background:#0E1630;color:#C7CFE3;margin-top:40px;padding:54px 0 26px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:30px}
.site-footer .brand{color:#fff;margin-bottom:12px}
.site-footer .brand-name{color:#fff}
.footer-note{color:#9AA6C4;font-size:14px;max-width:320px;margin:0}
.site-footer h4{color:#fff;font-size:15px;margin:4px 0 14px}
.site-footer a{color:#C7CFE3;display:block;padding:5px 0;font-size:14px}
.site-footer a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);margin-top:34px;padding-top:20px;color:#8A95B5;font-size:13px}
.footer-bottom p{margin:0}

/* ===== 404 ===== */
.nf{text-align:center;padding:calc(var(--header-h) + 90px) 0 110px}
.nf .code{font-size:96px;font-weight:800;color:var(--blue);line-height:1;margin:0}
.nf h1{font-size:26px;margin:10px 0 14px}
.nf p{color:var(--ink-2);margin:0 0 26px}

/* ===== 滚动渐显（默认可见，JS 启用后再隐藏触发，渐进增强） ===== */
.fade-up{opacity:1}

/* ===== 响应式 ===== */
@media (max-width:860px){
  .grid-3,.grid-2,.doc-grid{grid-template-columns:1fr}
  .steps{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .hero h1{font-size:36px}
  .section{padding:64px 0}
  .container{padding:0 24px}
  .dl-card{padding:24px 18px}
  .section-head{margin-bottom:32px}
  .nav-links{
    position:fixed;top:var(--header-h);left:0;right:0;background:#fff;border-bottom:1px solid var(--line);
    flex-direction:column;align-items:stretch;gap:0;padding:10px 16px 18px;display:none;box-shadow:0 12px 24px rgba(24,47,107,.08);
  }
  .nav-links.show{display:flex}
  .nav-links a{padding:13px 12px;border-radius:9px}
  .nav-links a.active{background:var(--blue-50)}
  .doc-wrap{padding:0 16px}
  .log-wrap{padding:0 16px}
  .doc-grid{gap:16px}
  .nav-cta{display:none}
  .nav-toggle{display:flex}
}
@media (max-width:560px){
  .hero h1{font-size:30px}
  .steps{grid-template-columns:1fr}
  .section-head h2{font-size:26px}
  .dl-meta{gap:10px}
}