:root{
  --brand:#245cf4;
  --brand-deep:#1a45c2;
  --brand-light:#eaf0ff;
  --ink:#15203b;
  --ink-2:#45526e;
  --ink-3:#7a869f;
  --line:#e6eaf3;
  --bg:#ffffff;
  --surface:#ffffff;
  --bg-soft:#f6f8fd;
  --header-bg:rgba(255,255,255,.9);
  --gold:#f5a623;
  --radius:16px;
  --shadow:0 8px 30px rgba(21,45,120,.08);
  --shadow-lg:0 18px 50px rgba(21,45,120,.14);
}
/* ---------- 深色模式（配色与官网一致） ---------- */
html[data-theme="dark"]{
  --brand-light:#192e4e;
  --ink:#edf3fc;
  --ink-2:#a7b4ca;
  --ink-3:#8494ad;
  --line:#2b3b54;
  --bg:#0b1220;
  --surface:#142238;
  --bg-soft:#101b2d;
  --header-bg:rgba(11,18,32,.92);
  --shadow:0 8px 30px rgba(0,0,0,.35);
  --shadow-lg:0 18px 50px rgba(0,0,0,.5);
}
html[data-theme="dark"] .site-header{border-bottom-color:var(--line)}
html[data-theme="dark"] .hero{
  background:
    radial-gradient(900px 480px at 85% -10%,rgba(36,92,244,.18),transparent 60%),
    linear-gradient(130deg,#0b1220 30%,#132846 100%);
}
html[data-theme="dark"] .eyebrow{color:#a8c5ff}
html[data-theme="dark"] .btn-outline{background:var(--surface);color:#a8c5ff;border-color:#536e99}
html[data-theme="dark"] .btn-outline:hover{background:#192e4e;color:#d6e4ff;border-color:#7ca7ff}
html[data-theme="dark"] .hero-platforms li{background:var(--surface)}
html[data-theme="dark"] .hero-mascot{filter:drop-shadow(0 10px 18px rgba(0,0,0,.5))}
html[data-theme="dark"] .feature-card.gold .f-icon,
html[data-theme="dark"] .vip-panel-head .f-icon.amber{background:rgba(217,138,0,.16);color:#f0b44c}
html[data-theme="dark"] .vip-panel-head .f-icon.red{background:rgba(212,58,47,.16);color:#f07167}
html[data-theme="dark"] .vip-panel-head .f-icon.teal{background:rgba(14,158,120,.16);color:#3fce9f}
html[data-theme="dark"] .dl-note code{color:#a8c5ff}
html[data-theme="dark"] .faq-item{background:var(--surface)}
html[data-theme="dark"] .site-footer{background:#0a0f1c}
html[data-theme="dark"] .theme-toggle .theme-icon-moon{display:none}
html[data-theme="dark"] .theme-toggle .theme-icon-sun{display:block}
/* 深色模式下手机模型保持亮色 App 界面 */
html[data-theme="dark"] .phone-status,
html[data-theme="dark"] .phone-title .icon{color:#45526e}
html[data-theme="dark"] .phone-title,
html[data-theme="dark"] .conv strong{color:#15203b}
html[data-theme="dark"] .phone-search{background:#f6f8fd;color:#7a869f}
html[data-theme="dark"] .conv span,
html[data-theme="dark"] .conv time{color:#7a869f}
html[data-theme="dark"] .conv .conv-body{border-bottom-color:#e6eaf3}
html[data-theme="dark"] .phone-tabbar{border-top-color:#e6eaf3;color:#7a869f}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
ul{list-style:none}
.container{max-width:1180px;margin:0 auto;padding:0 24px}
.icon{width:20px;height:20px;flex:none}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;justify-content:center;
  padding:13px 26px;border-radius:999px;font-size:15px;font-weight:600;
  background:var(--brand);color:#fff;border:1.5px solid var(--brand);
  cursor:pointer;transition:transform .2s,box-shadow .2s,background .2s;
}
.btn:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(36,92,244,.35);background:var(--brand-deep)}
.btn-outline{background:var(--surface);color:var(--brand)}
.btn-outline:hover{background:var(--brand-light);box-shadow:0 10px 24px rgba(36,92,244,.15)}
.btn-lg{padding:16px 34px;font-size:16px}

/* ---------- 头部 ---------- */
.site-header{
  position:sticky;top:0;z-index:100;background:var(--header-bg);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;gap:32px;height:68px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px}
.brand span{display:inline-flex;align-items:center;gap:8px;line-height:1.25}
.brand img{height:38px;width:38px;border-radius:9px}
.brand small{font-size:12px;font-weight:500;color:var(--ink-3);border:1px solid var(--line);border-radius:6px;padding:1px 7px;flex:none}
.nav{display:flex;gap:26px;margin-left:auto}
.nav a{font-size:15px;color:var(--ink-2);transition:color .2s}
.nav a:hover{color:var(--brand)}
.header-cta{margin-left:8px;padding:9px 22px;font-size:14px}
.menu-toggle{display:none;background:none;border:0;cursor:pointer;color:var(--ink);padding:6px}
.menu-toggle .icon{width:24px;height:24px}
/* 主题切换按钮 */
.theme-toggle{
  display:inline-flex;align-items:center;justify-content:center;
  width:38px;height:38px;border-radius:10px;cursor:pointer;
  background:var(--bg-soft);border:1px solid var(--line);color:var(--ink-2);
  transition:background .2s,color .2s,border-color .2s;
}
.theme-toggle:hover{color:var(--brand);border-color:var(--brand)}
.theme-toggle .icon{width:19px;height:19px}
.theme-toggle .theme-icon-sun{display:none}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(900px 480px at 85% -10%,rgba(36,92,244,.12),transparent 60%),
    radial-gradient(700px 420px at -10% 110%,rgba(36,92,244,.08),transparent 60%),
    var(--bg-soft);
  padding:72px 0 80px;
}
.hero-main{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.eyebrow{
  display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;
  color:var(--brand);background:var(--brand-light);border-radius:999px;padding:6px 14px;
}
.hero h1{font-size:clamp(32px,4.6vw,52px);line-height:1.2;letter-spacing:.5px;margin:20px 0 16px}
.hero h1 span{display:block;color:var(--brand)}
.hero-desc{font-size:17px;color:var(--ink-2);max-width:520px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:32px}
.hero-meta{display:flex;flex-wrap:wrap;gap:10px 24px;margin-top:26px;color:var(--ink-3);font-size:14px}
.hero-meta li{display:flex;align-items:center;gap:7px}
.hero-meta .icon{width:17px;height:17px;color:var(--brand)}

/* 首屏右侧：手机界面 + 吉祥物 */
.hero-visual{position:relative;display:flex;justify-content:center}
.phone{
  width:min(300px,78vw);aspect-ratio:9/19;border-radius:38px;background:#fff;
  border:9px solid #1b2440;box-shadow:var(--shadow-lg);overflow:hidden;
  display:flex;flex-direction:column;position:relative;z-index:2;
}
.phone-status{display:flex;justify-content:space-between;padding:10px 18px 4px;font-size:11px;color:var(--ink-2)}
.phone-title{display:flex;align-items:center;justify-content:space-between;padding:8px 16px;font-weight:700;font-size:17px}
.phone-title .icon{width:20px;height:20px;color:var(--ink-2)}
.phone-search{
  margin:4px 14px 10px;background:var(--bg-soft);border-radius:8px;
  color:var(--ink-3);font-size:12px;padding:7px 10px;display:flex;align-items:center;gap:6px;
}
.phone-search .icon{width:14px;height:14px}
.conv{display:flex;align-items:center;gap:10px;padding:9px 14px}
.conv .avatar{width:42px;height:42px;border-radius:10px;flex:none}
.conv .conv-body{flex:1;min-width:0;border-bottom:1px solid var(--line);padding-bottom:9px}
.conv strong{display:block;font-size:13.5px}
.conv span{font-size:12px;color:var(--ink-3);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:block}
.conv time{font-size:11px;color:var(--ink-3);align-self:flex-start;margin-top:2px}
.conv .badge{background:#f44;color:#fff;font-size:10px;min-width:17px;height:17px;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;padding:0 5px}
.vip-tag{font-size:10px;color:#a56a00;background:linear-gradient(120deg,#ffe9bd,#ffd98a);border-radius:4px;padding:0 5px;font-weight:700}
.avatar{border-radius:10px;background:
  radial-gradient(circle at 32% 34%,rgba(255,255,255,.65) 0 12%,transparent 13%),
  radial-gradient(circle at 50% 38%,#fff 0 17%,transparent 18%),
  radial-gradient(circle at 50% 92%,#fff 0 32%,transparent 33%),
  linear-gradient(135deg,var(--c1),var(--c2));}
.phone-tabbar{
  margin-top:auto;display:flex;justify-content:space-around;border-top:1px solid var(--line);
  padding:8px 0 14px;font-size:11px;color:var(--ink-3);
}
.phone-tabbar span{display:flex;flex-direction:column;align-items:center;gap:2px}
.phone-tabbar .active{color:var(--brand)}
.phone-tabbar .icon{width:21px;height:21px}
.hero-mascot{
  position:absolute;right:max(-8px,calc(50% - 260px));bottom:-6px;width:130px;z-index:3;
  filter:drop-shadow(0 10px 18px rgba(21,45,120,.25));
  animation:float 4s ease-in-out infinite;
}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
.hero-platforms{display:flex;flex-wrap:wrap;gap:8px;margin-top:34px}
.hero-platforms li{
  display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--ink-2);
  background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:6px 14px;
}
.hero-platforms .icon{width:15px;height:15px;color:var(--brand)}

/* ---------- 通用区块 ---------- */
.section{padding:84px 0}
.section-soft{background:var(--bg-soft)}
.section-intro{text-align:center;max-width:640px;margin:0 auto 48px}
.section-intro h2{font-size:clamp(26px,3.4vw,36px);margin:16px 0 10px}
.section-intro p{color:var(--ink-2)}

/* ---------- 功能亮点 ---------- */
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.feature-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 22px;transition:transform .25s,box-shadow .25s,border-color .25s;
}
.feature-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:rgba(36,92,244,.35)}
.feature-card .f-icon{
  width:46px;height:46px;border-radius:12px;background:var(--brand-light);color:var(--brand);
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;
}
.feature-card .f-icon .icon{width:23px;height:23px}
.feature-card h3{font-size:16.5px;margin-bottom:7px}
.feature-card p{font-size:13.5px;color:var(--ink-2)}
.feature-card.gold .f-icon{background:#fff3dd;color:#d98a00}

/* ---------- 增值能力演示 ---------- */
.vip-band{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.vip-panel{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:32px 30px;transition:transform .25s,box-shadow .25s,border-color .25s;
}
.vip-panel:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:rgba(36,92,244,.35)}
.vip-panel-head{display:flex;align-items:center;gap:14px;margin-bottom:16px}
.vip-panel-head .f-icon{
  width:48px;height:48px;border-radius:12px;background:var(--brand-light);color:var(--brand);
  display:flex;align-items:center;justify-content:center;flex:none;
}
.vip-panel-head .f-icon.amber{background:#fff3dd;color:#d98a00}
.vip-panel-head .f-icon.red{background:#fdeceb;color:#d43a2f}
.vip-panel-head .f-icon.teal{background:#e3f6f0;color:#0e9e78}
.vip-panel-head .f-icon .icon{width:24px;height:24px}
.vip-panel h3{font-size:19px}
.vip-panel-sub{font-size:11px;color:var(--ink-3);letter-spacing:1.5px}
.vip-panel p{font-size:14px;color:var(--ink-2)}
.vip-panel ul{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.vip-panel ul li{
  font-size:12.5px;color:var(--ink-2);background:var(--bg-soft);border:1px solid var(--line);
  border-radius:999px;padding:5px 13px;
}

/* ---------- 下载区块 ---------- */
.download-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.dl-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 24px;text-align:center;display:flex;flex-direction:column;align-items:center;
  transition:transform .25s,box-shadow .25s,border-color .25s;position:relative;
}
.dl-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:rgba(36,92,244,.35)}
.dl-card.recommend{border-color:var(--brand);box-shadow:0 12px 34px rgba(36,92,244,.16)}
.dl-card .dl-flag{
  position:absolute;top:-12px;background:var(--brand);color:#fff;font-size:12px;font-weight:600;
  border-radius:999px;padding:3px 14px;
}
.dl-card .d-icon{
  width:58px;height:58px;border-radius:16px;background:var(--brand-light);color:var(--brand);
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;
}
.dl-card .d-icon .icon{width:29px;height:29px}
.dl-card h3{font-size:18px;margin-bottom:4px}
.dl-card .d-desc{font-size:13px;color:var(--ink-3);margin-bottom:6px}
.dl-card .d-ver{font-size:12px;color:var(--ink-3);margin-bottom:18px}
.dl-card .btn{width:100%;padding:12px 0;font-size:14.5px;margin-top:auto}
.dl-note{margin-top:34px;text-align:center;font-size:13px;color:var(--ink-3)}
.dl-note code{background:var(--brand-light);color:var(--brand);border-radius:6px;padding:2px 8px;font-size:12px}

/* ---------- FAQ ---------- */
.faq-list{max-width:780px;margin:0 auto}
.faq-item{border:1px solid var(--line);border-radius:14px;margin-bottom:12px;background:var(--surface);overflow:hidden}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 22px;background:none;border:0;cursor:pointer;text-align:left;
  font-size:15.5px;font-weight:600;color:var(--ink);font-family:inherit;
}
.faq-q .icon{transition:transform .25s;color:var(--ink-3)}
.faq-item.open .faq-q .icon{transform:rotate(180deg);color:var(--brand)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-a p{padding:0 22px 20px;font-size:14.5px;color:var(--ink-2)}

/* ---------- 页脚 ---------- */
.site-footer{background:#101a33;color:#9fb0d8;padding:52px 0 28px}
.footer-main{display:flex;flex-wrap:wrap;gap:36px;justify-content:space-between;align-items:flex-start}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:17px}
.footer-brand img{height:34px;width:34px;border-radius:8px}
.footer-brand p{font-size:13px;color:#7f92bd;font-weight:400;margin-top:8px;max-width:340px}
.footer-links{display:flex;gap:56px}
.footer-links h4{color:#fff;font-size:14.5px;margin-bottom:14px}
.footer-links li{margin-bottom:9px}
.footer-links a{font-size:13.5px;transition:color .2s}
.footer-links a:hover{color:#fff}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);margin-top:38px;padding-top:22px;
  font-size:12.5px;color:#6f81ab;text-align:center;
}

/* ---------- 提示 Toast ---------- */
.toast{
  position:fixed;left:50%;bottom:56px;z-index:999;max-width:86vw;
  transform:translateX(-50%) translateY(16px);
  background:rgba(21,32,59,.94);color:#fff;font-size:14px;line-height:1.5;
  padding:12px 22px;border-radius:12px;text-align:center;
  opacity:0;pointer-events:none;transition:opacity .3s,transform .3s;
  box-shadow:0 10px 30px rgba(0,0,0,.25);
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ---------- 微信内置浏览器引导弹窗 ---------- */
.wx-guide{
  position:fixed;inset:0;z-index:1000;background:rgba(8,12,24,.82);
  opacity:0;pointer-events:none;transition:opacity .3s;
}
.wx-guide.show{opacity:1;pointer-events:auto}
.wx-guide-inner{
  position:absolute;top:10px;right:16px;display:flex;flex-direction:column;
  align-items:flex-end;color:#fff;max-width:280px;
}
.wx-guide-arrow{width:74px;height:74px;margin-right:6px;animation:wxNudge 1.6s ease-in-out infinite}
@keyframes wxNudge{0%,100%{transform:translate(0,0)}50%{transform:translate(6px,-6px)}}
.wx-guide-text{
  margin-top:4px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.22);
  border-radius:14px;padding:14px 18px;text-align:left;backdrop-filter:blur(4px);
}
.wx-guide-text strong{display:block;font-size:16px;margin-bottom:4px}
.wx-guide-text strong .wx-dots{
  display:inline-block;background:#fff;color:#111;border-radius:6px;
  font-weight:800;font-style:normal;padding:0 7px;margin:0 2px;letter-spacing:1px;
}
.wx-guide-text span{font-size:13px;color:rgba(255,255,255,.82)}
.wx-guide-close{
  margin-top:14px;font-size:13px;color:rgba(255,255,255,.75);
  border:1px solid rgba(255,255,255,.35);border-radius:999px;padding:6px 18px;
}

/* ---------- 移动端适配 ---------- */
@media (max-width:1024px){
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .download-grid{grid-template-columns:repeat(2,1fr)}
  .vip-band{grid-template-columns:1fr}
  .hero-main{grid-template-columns:1fr;gap:48px}
  .hero-desc{max-width:none}
}
@media (max-width:640px){
  .container{padding:0 18px}
  .section{padding:60px 0}
  .hero{padding:48px 0 60px}
  .nav{
    display:none;position:absolute;left:0;right:0;top:68px;background:var(--surface);
    flex-direction:column;gap:0;padding:8px 18px 14px;border-bottom:1px solid var(--line);
    box-shadow:var(--shadow-lg);
  }
  .nav.open{display:flex}
  .nav a{padding:12px 4px;border-bottom:1px solid var(--line)}
  .nav a:last-child{border-bottom:0}
  .menu-toggle{display:block;margin-left:auto}
  .header-cta{display:none}
  /* 首屏按钮纵向排列，避免挤压变形 */
  .hero-actions{flex-direction:column}
  .hero-actions .btn{width:100%;flex:none;justify-content:center;padding:15px 20px}
  .feature-grid{grid-template-columns:1fr}
  .download-grid{grid-template-columns:1fr}
  .vip-panel{padding:26px 22px}
  .hero-mascot{width:96px;right:calc(50% - 190px)}
  .footer-links{gap:36px}
}

/* Keep the return link and product navigation readable on tablets and phones. */
@media (max-width:1024px){
  .site-header .header-inner{gap:16px}
  .site-header .brand{flex-shrink:0;white-space:nowrap}
  .site-header .nav{
    display:none;position:absolute;left:0;right:0;top:68px;background:var(--surface);
    flex-direction:column;align-items:stretch;gap:0;margin-left:0;
    padding:8px 18px 14px;border-bottom:1px solid var(--line);box-shadow:var(--shadow-lg);
  }
  .site-header .nav.open{display:flex}
  .site-header .nav a,.site-header .nav button{padding:12px 4px;border-bottom:1px solid var(--line);text-align:left}
  .site-header .nav>*:last-child{border-bottom:0}
  .site-header .menu-toggle{display:block;margin-left:0;flex-shrink:0}
  .site-header .theme-toggle{margin-left:auto;flex-shrink:0}
  .site-header .header-cta{display:none}
}