:root{
  --violet:#7c6cff;
  --violet-2:#a78bfa;
  --violet-deep:#5b4bd6;
  --bg:#0b0a14;
  --bg-2:#110f1f;
  --card:rgba(255,255,255,.04);
  --card-border:rgba(255,255,255,.09);
  --text:#eceaf6;
  --muted:#9a95b8;
  --radius:16px;
  --maxw:1160px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);color:var(--text);line-height:1.65;overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.container.narrow{max-width:800px}
.accent{color:var(--violet-2)}

/* 背景光效 */
.bg-glow{position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    radial-gradient(600px 400px at 15% 5%,rgba(124,108,255,.28),transparent 60%),
    radial-gradient(700px 500px at 85% 15%,rgba(167,139,250,.18),transparent 60%),
    radial-gradient(800px 600px at 50% 100%,rgba(91,75,214,.16),transparent 60%);
}
.grid-overlay{position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.35;
  background-image:linear-gradient(rgba(255,255,255,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.03) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(circle at 50% 30%,#000 30%,transparent 80%);
  -webkit-mask-image:radial-gradient(circle at 50% 30%,#000 30%,transparent 80%);
}

/* 导航 */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;transition:background .3s,border-color .3s,backdrop-filter .3s;border-bottom:1px solid transparent}
.nav.scrolled{background:rgba(11,10,20,.75);backdrop-filter:blur(14px);border-bottom-color:var(--card-border)}
.nav-inner{display:flex;align-items:center;gap:28px;height:68px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;letter-spacing:.2px}
.logo-mark svg{border-radius:8px;box-shadow:0 4px 20px rgba(124,108,255,.5)}
.nav-links{display:flex;gap:26px;margin-left:auto;font-size:15px;color:var(--muted)}
.nav-links a{transition:color .2s}
.nav-links a:hover{color:var(--text)}
.nav-cta{margin-left:6px}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px;margin-left:auto}
.nav-toggle span{width:22px;height:2px;background:var(--text);border-radius:2px;transition:.3s}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;font-weight:600;border-radius:12px;cursor:pointer;border:1px solid transparent;transition:transform .18s,box-shadow .18s,background .2s,border-color .2s;white-space:nowrap}
.btn:active{transform:translateY(1px)}
.btn-sm{padding:8px 16px;font-size:14px}
.btn-lg{padding:15px 30px;font-size:17px}
.btn-primary{background:linear-gradient(135deg,var(--violet),var(--violet-2));color:#fff;box-shadow:0 8px 30px rgba(124,108,255,.4)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 40px rgba(124,108,255,.55)}
.btn-ghost{background:rgba(255,255,255,.05);border-color:var(--card-border);color:var(--text)}
.btn-ghost:hover{background:rgba(255,255,255,.1);transform:translateY(-2px)}

/* Hero */
.hero{padding:150px 0 90px;display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;max-width:var(--maxw);margin:0 auto;padding-left:24px;padding-right:24px}
.hero-inner{max-width:none}
.badge{display:inline-block;padding:7px 16px;border-radius:999px;font-size:13.5px;background:rgba(124,108,255,.14);border:1px solid rgba(124,108,255,.35);color:var(--violet-2);margin-bottom:22px}
.hero-title{font-size:clamp(38px,5.2vw,62px);line-height:1.08;font-weight:850;letter-spacing:-.5px}
.grad{background:linear-gradient(120deg,#a78bfa,#7c6cff 50%,#c4b5fd);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{margin:22px 0 32px;font-size:18px;color:var(--muted);max-width:560px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-note{margin-top:18px;font-size:14px;color:var(--muted)}

/* 窗口 mock */
.hero-visual{display:flex;justify-content:center}
.window-mock{width:100%;max-width:480px;background:linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.02));border:1px solid var(--card-border);border-radius:18px;overflow:hidden;box-shadow:0 30px 80px rgba(0,0,0,.5),0 0 0 1px rgba(124,108,255,.1);backdrop-filter:blur(8px)}
.wm-bar{display:flex;align-items:center;gap:8px;padding:13px 16px;background:rgba(255,255,255,.04);border-bottom:1px solid var(--card-border)}
.wm-bar .dot{width:11px;height:11px;border-radius:50%;background:#3a3a52}
.wm-bar .dot:nth-child(1){background:#ff5f57}.wm-bar .dot:nth-child(2){background:#febc2e}.wm-bar .dot:nth-child(3){background:#28c840}
.wm-title{margin-left:8px;font-size:13px;color:var(--muted)}
.wm-body{display:flex;min-height:260px}
.wm-side{width:70px;padding:16px 12px;display:flex;flex-direction:column;gap:12px;border-right:1px solid var(--card-border)}
.wm-item{height:26px;border-radius:8px;background:rgba(255,255,255,.05)}
.wm-item.active{background:linear-gradient(135deg,var(--violet),var(--violet-2))}
.wm-main{flex:1;padding:18px;display:flex;flex-direction:column;gap:14px}
.wm-msg{font-size:13px;padding:11px 14px;border-radius:12px;max-width:90%}
.wm-msg.user{align-self:flex-end;background:linear-gradient(135deg,var(--violet),var(--violet-2));color:#fff}
.wm-msg.ai{align-self:flex-start;background:rgba(255,255,255,.05);border:1px solid var(--card-border);display:flex;flex-direction:column;gap:8px;width:100%}
.wm-tag{font-size:11px;color:var(--violet-2)}
.wm-line{height:8px;border-radius:4px;background:rgba(255,255,255,.1)}
.wm-line.short{width:60%}
.wm-tool{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:11.5px;color:var(--violet-2)}
.wm-tool.ok{color:#4ade80}

/* 区块 */
.section{padding:96px 0}
.section-alt{background:linear-gradient(180deg,rgba(255,255,255,.015),rgba(255,255,255,0))}
.section-head{text-align:center;max-width:680px;margin:0 auto 52px}
.section-head h2{font-size:clamp(28px,3.6vw,40px);font-weight:820;letter-spacing:-.4px}
.section-head p{margin-top:12px;color:var(--muted);font-size:17px}

/* 卡片 */
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.card{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);padding:28px 24px;transition:transform .25s,border-color .25s,box-shadow .25s;position:relative;overflow:hidden}
.card::after{content:"";position:absolute;inset:0;border-radius:var(--radius);background:radial-gradient(400px 200px at 50% -20%,rgba(124,108,255,.18),transparent 70%);opacity:0;transition:opacity .25s}
.card:hover{transform:translateY(-6px);border-color:rgba(124,108,255,.5);box-shadow:0 20px 50px rgba(0,0,0,.4)}
.card:hover::after{opacity:1}
.card-icon{font-size:34px;margin-bottom:16px}
.card h3{font-size:19px;margin-bottom:10px}
.card p{color:var(--muted);font-size:14.5px}

/* 功能格 */
.feature-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.feature{display:flex;gap:16px;padding:22px;border-radius:14px;background:var(--card);border:1px solid var(--card-border);transition:transform .2s,border-color .2s}
.feature:hover{transform:translateX(4px);border-color:rgba(124,108,255,.45)}
.f-ico{font-size:26px;flex-shrink:0}
.feature h4{font-size:16.5px;margin-bottom:5px}
.feature p{color:var(--muted);font-size:14px}

/* 下载 */
.download-box{text-align:center;padding:64px 32px;border-radius:24px;background:linear-gradient(180deg,rgba(124,108,255,.14),rgba(124,108,255,.04));border:1px solid rgba(124,108,255,.3);position:relative;overflow:hidden}
.download-box::before{content:"";position:absolute;top:-50%;left:50%;transform:translateX(-50%);width:600px;height:400px;background:radial-gradient(circle,rgba(124,108,255,.35),transparent 70%);pointer-events:none}
.download-box h2{font-size:clamp(26px,3.4vw,36px);position:relative}
.download-box p{color:var(--muted);margin:14px 0 30px;position:relative}
.download-box .btn{position:relative}
.dl-meta{font-size:13.5px!important;margin-top:18px!important;opacity:.8}

/* FAQ */
.faq-list{display:flex;flex-direction:column;gap:14px}
.faq{background:var(--card);border:1px solid var(--card-border);border-radius:14px;overflow:hidden;transition:border-color .2s}
.faq[open]{border-color:rgba(124,108,255,.45)}
.faq summary{cursor:pointer;padding:20px 24px;font-size:16.5px;font-weight:600;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:22px;color:var(--violet-2);transition:transform .25s;flex-shrink:0}
.faq[open] summary::after{transform:rotate(45deg)}
.faq-body{padding:0 24px 22px;color:var(--muted);font-size:15px}

/* 页脚 */
.footer{border-top:1px solid var(--card-border);padding:56px 0 32px;margin-top:40px;background:rgba(0,0,0,.25)}
.footer-inner{display:flex;justify-content:space-between;align-items:flex-start;gap:32px;flex-wrap:wrap}
.footer-brand .logo-text{font-size:22px;font-weight:800}
.footer-brand p{color:var(--muted);font-size:14px;margin-top:8px}
.footer-links{display:flex;gap:24px;font-size:15px;color:var(--muted)}
.footer-links a:hover{color:var(--text)}
.footer-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:40px;padding-top:24px;border-top:1px solid var(--card-border);font-size:13.5px;color:var(--muted)}

/* 动画 */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s cubic-bezier(.2,.7,.3,1),transform .7s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}

/* 响应式 */
@media (max-width:920px){
  .hero{grid-template-columns:1fr;padding-top:120px;text-align:center}
  .hero-sub{margin-left:auto;margin-right:auto}
  .hero-actions{justify-content:center}
  .hero-visual{order:-1;margin-bottom:8px}
  .cards{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:640px){
  .container{padding:0 18px}
  .hero{padding-left:18px;padding-right:18px}
  .nav-links{display:none;position:absolute;top:68px;left:0;right:0;flex-direction:column;gap:0;background:rgba(11,10,20,.97);backdrop-filter:blur(14px);border-bottom:1px solid var(--card-border);padding:8px 18px 16px}
  .nav-links.open{display:flex}
  .nav-links a{padding:12px 0;border-bottom:1px solid var(--card-border);color:var(--text)}
  .nav-cta{display:none}
  .nav-toggle{display:flex}
  .cards{grid-template-columns:1fr}
  .feature-grid{grid-template-columns:1fr}
  .section{padding:64px 0}
  .download-box{padding:44px 20px}
  .footer-inner,.footer-bottom{flex-direction:column;gap:14px}
}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}


/* ===== 下载区醒目提示 + 微信二维码 ===== */
.dl-notice{
  margin:18px 0 0;
  color:#f5a623;
  font-weight:700;
  font-size:15px;
  text-align:center;
}
.dl-qr{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:8px;
  margin:20px auto 0;
}
.dl-qr img{
  width:180px;
  height:auto;
  border-radius:12px;
  padding:8px;
  background:#fff;
  box-shadow:0 8px 30px rgba(0,0,0,.35);
}
.dl-qr span{
  font-size:13px;
  color:var(--text-muted,#9aa0b0);
}

/* ===== Footer 联系我 + 二维码 ===== */
.footer-contact{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:8px;
}
.footer-contact-title{
  font-size:14px;
  color:var(--text-muted,#9aa0b0);
}
.footer-qr{
  width:120px;
  height:auto;
  border-radius:10px;
  padding:6px;
  background:#fff;
}