/* ========== 全局重置与基础 ========== */
*{margin:0;padding:0;box-sizing:border-box}
:root{
  --primary:#00e676;
  --primary-dark:#00c853;
  --accent:#ff6d00;
  --bg-dark:#0a0e17;
  --bg-card:#111827;
  --bg-card-hover:#1a2332;
  --text:#e2e8f0;
  --text-muted:#94a3b8;
  --border:#1e293b;
  --gradient:linear-gradient(135deg,#00e676 0%,#00b0ff 100%);
  --gradient-accent:linear-gradient(135deg,#ff6d00 0%,#ff9100 100%);
}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans SC",sans-serif;
  background:var(--bg-dark);
  color:var(--text);
  line-height:1.7;
  overflow-x:hidden;
}
a{color:var(--primary);text-decoration:none;transition:color .3s}
a:hover{color:var(--primary-dark)}
img{max-width:100%;display:block}

/* ========== 顶部导航 ========== */
.navbar{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  background:rgba(10,14,23,.92);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
}
.nav-inner{
  max-width:1200px;margin:0 auto;padding:0 20px;
  display:flex;align-items:center;justify-content:space-between;height:64px;
}
.nav-logo{
  font-size:1.3rem;font-weight:800;
  background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;
  letter-spacing:1px;
}
.nav-links{display:flex;gap:28px;list-style:none}
.nav-links a{color:var(--text-muted);font-size:.92rem;font-weight:500}
.nav-links a:hover{color:var(--primary)}
.nav-cta{
  background:var(--gradient);color:#000!important;
  padding:8px 20px;border-radius:20px;font-weight:700;font-size:.88rem;
}
.nav-cta:hover{opacity:.9;color:#000!important}
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;background:none;border:none;padding:4px}
.hamburger span{width:24px;height:2px;background:var(--text);border-radius:2px;transition:.3s}

/* ========== Hero 三主图模块 ========== */
.hero{
  padding:100px 20px 60px;
  max-width:1200px;margin:0 auto;
}
.hero-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:20px;
}
.hero-card{
  position:relative;border-radius:16px;overflow:hidden;
  aspect-ratio:4/3;background:var(--bg-card);
  border:1px solid var(--border);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:30px;text-align:center;transition:transform .3s,border-color .3s;
}
.hero-card:hover{transform:translateY(-4px);border-color:var(--primary)}
.hero-card-icon{
  width:64px;height:64px;border-radius:16px;
  background:var(--gradient);display:flex;align-items:center;justify-content:center;
  margin-bottom:16px;font-size:1.8rem;
}
.hero-card h3{font-size:1.15rem;margin-bottom:8px;color:var(--text)}
.hero-card p{font-size:.85rem;color:var(--text-muted);line-height:1.6}
.hero-card .tag{
  position:absolute;top:12px;right:12px;
  background:var(--gradient-accent);color:#000;
  font-size:.72rem;font-weight:700;padding:4px 10px;border-radius:12px;
}

/* ========== 通用 Section ========== */
.section{padding:60px 20px}
.section-inner{max-width:1200px;margin:0 auto}
.section-title{
  text-align:center;margin-bottom:48px;
}
.section-title h2{
  font-size:1.8rem;font-weight:800;margin-bottom:10px;
  background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;
}
.section-title p{color:var(--text-muted);font-size:.95rem}

/* ========== 功能卡片模块 ========== */
.cards-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:20px;
}
.card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:14px;padding:28px 22px;text-align:center;
  transition:all .3s;
}
.card:hover{background:var(--bg-card-hover);border-color:var(--primary);transform:translateY(-3px)}
.card-icon{
  width:52px;height:52px;border-radius:12px;margin:0 auto 16px;
  display:flex;align-items:center;justify-content:center;font-size:1.5rem;
}
.card-icon.g1{background:rgba(0,230,118,.15);color:var(--primary)}
.card-icon.g2{background:rgba(0,176,255,.15);color:#00b0ff}
.card-icon.g3{background:rgba(255,109,0,.15);color:var(--accent)}
.card-icon.g4{background:rgba(233,30,99,.15);color:#e91e63}
.card h4{font-size:1rem;margin-bottom:8px;color:var(--text)}
.card p{font-size:.82rem;color:var(--text-muted);line-height:1.6}

/* ========== 功能介绍模块 ========== */
.features-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:20px;
}
.feature-item{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:14px;padding:30px;
  display:flex;gap:18px;align-items:flex-start;
  transition:border-color .3s;
}
.feature-item:hover{border-color:var(--primary)}
.feature-num{
  min-width:40px;height:40px;border-radius:10px;
  background:var(--gradient);display:flex;align-items:center;justify-content:center;
  font-weight:800;color:#000;font-size:1rem;flex-shrink:0;
}
.feature-item h4{font-size:1rem;margin-bottom:6px}
.feature-item p{font-size:.85rem;color:var(--text-muted);line-height:1.6}

/* ========== 部署教程模块 ========== */
.tutorial-steps{
  display:grid;grid-template-columns:repeat(4,1fr);gap:16px;
}
.step{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:14px;padding:24px 18px;text-align:center;
  position:relative;transition:border-color .3s;
}
.step:hover{border-color:var(--primary)}
.step-num{
  width:36px;height:36px;border-radius:50%;
  background:var(--gradient);color:#000;font-weight:800;
  display:flex;align-items:center;justify-content:center;
  margin:0 auto 14px;font-size:.9rem;
}
.step h4{font-size:.92rem;margin-bottom:6px}
.step p{font-size:.8rem;color:var(--text-muted);line-height:1.5}
.step::after{
  content:'→';position:absolute;right:-10px;top:50%;
  transform:translateY(-50%);color:var(--text-muted);font-size:1.2rem;
  display:none;
}
.step:last-child::after{display:none}

/* ========== FAQ 模块 ========== */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:12px;margin-bottom:12px;overflow:hidden;
}
.faq-q{
  padding:18px 24px;cursor:default;font-weight:600;font-size:.95rem;
  display:flex;align-items:center;justify-content:space-between;
}
.faq-q .arrow{
  transition:transform .3s;color:var(--primary);font-size:1.2rem;
}
.faq-a{
  padding:0 24px 18px;font-size:.88rem;color:var(--text-muted);
  line-height:1.7;display:none;
}
.faq-item.open .faq-a{display:block}
.faq-item.open .arrow{transform:rotate(180deg)}

/* ========== 底部模块 ========== */
.footer{
  background:#060a12;border-top:1px solid var(--border);
  padding:50px 20px 30px;
}
.footer-inner{max-width:1200px;margin:0 auto}
.footer-top{
  display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px;
  margin-bottom:40px;
}
.footer-brand h3{
  font-size:1.3rem;font-weight:800;
  background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;
  margin-bottom:12px;
}
.footer-brand p{font-size:.85rem;color:var(--text-muted);line-height:1.7}
.footer-col h4{font-size:.95rem;margin-bottom:16px;color:var(--text)}
.footer-col ul{list-style:none}
.footer-col li{margin-bottom:10px}
.footer-col a{font-size:.85rem;color:var(--text-muted)}
.footer-col a:hover{color:var(--primary)}
.footer-bottom{
  border-top:1px solid var(--border);padding-top:24px;
  display:flex;align-items:center;justify-content:space-between;
  flex-wrap:wrap;gap:12px;
}
.footer-bottom p{font-size:.8rem;color:var(--text-muted)}
.footer-params{display:flex;gap:20px;flex-wrap:wrap}
.footer-params span{
  font-size:.78rem;color:var(--text-muted);
  background:var(--bg-card);padding:4px 12px;border-radius:8px;
  border:1px solid var(--border);
}

/* ========== 下载按钮模块 ========== */
.download-section{
  text-align:center;padding:40px 20px;
  background:linear-gradient(180deg,transparent 0%,rgba(0,230,118,.05) 50%,transparent 100%);
}
.download-btn{
  display:inline-flex;align-items:center;gap:10px;
  background:var(--gradient);color:#000;
  padding:16px 48px;border-radius:30px;font-size:1.1rem;
  font-weight:800;border:none;cursor:pointer;text-decoration:none;
  transition:transform .2s,opacity .2s;
}
.download-btn:hover{transform:scale(1.05);opacity:.95}
.download-btn svg{width:22px;height:22px;fill:#000}
.download-note{margin-top:14px;font-size:.82rem;color:var(--text-muted)}

/* ========== 响应式 ========== */
@media(max-width:1024px){
  .hero-grid{grid-template-columns:1fr 1fr}
  .cards-grid{grid-template-columns:repeat(2,1fr)}
  .features-grid{grid-template-columns:1fr 1fr}
  .tutorial-steps{grid-template-columns:repeat(2,1fr)}
  .footer-top{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .nav-links{display:none}
  .hamburger{display:flex}
  .nav-links.active{
    display:flex;flex-direction:column;position:absolute;
    top:64px;left:0;right:0;background:rgba(10,14,23,.98);
    padding:20px;gap:16px;border-bottom:1px solid var(--border);
  }
  .hero-grid{grid-template-columns:1fr}
  .cards-grid{grid-template-columns:1fr}
  .features-grid{grid-template-columns:1fr}
  .tutorial-steps{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr}
  .footer-bottom{justify-content:center;text-align:center}
  .section-title h2{font-size:1.4rem}
  .download-btn{padding:14px 36px;font-size:1rem}
}
@media(max-width:480px){
  .nav-inner{padding:0 14px}
  .hero{padding:84px 14px 40px}
  .section{padding:40px 14px}
  .card{padding:22px 16px}
  .feature-item{padding:20px;gap:14px}
}

/* ========== 图标 SVG 占位（可替换为图片链接）========== */
.icon-target{width:24px;height:24px;fill:currentColor}
.icon-shield{width:24px;height:24px;fill:currentColor}
.icon-bolt{width:24px;height:24px;fill:currentColor}
.icon-eye{width:24px;height:24px;fill:currentColor}