/* ========== CSS Reset & Base ========== */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:70px}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:#0a0e27;color:#e0e0e0;line-height:1.6;overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
img{max-width:100%;display:block}
button{cursor:pointer;border:none;font-family:inherit}

/* ========== CSS Variables ========== */
:root{
  --primary:#ff4655;--primary-dark:#d63a4a;--primary-glow:rgba(255,70,85,.35);
  --accent:#0f4fff;--accent-glow:rgba(15,79,255,.3);
  --bg-dark:#0a0e27;--bg-card:#131736;--bg-card-hover:#1a1f45;
  --text:#e0e0e0;--text-muted:#8a8fa3;--text-bright:#ffffff;
  --border:#1e2555;--radius:12px;--radius-sm:8px;
  --shadow:0 4px 24px rgba(0,0,0,.4);
  --transition:all .3s ease;
}

/* ========== Utility Classes ========== */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section-title{
  text-align:center;margin-bottom:50px;
}
.section-title h2{
  font-size:clamp(1.5rem,4vw,2.2rem);color:var(--text-bright);
  margin-bottom:12px;position:relative;display:inline-block;
}
.section-title h2::after{
  content:'';display:block;width:60px;height:3px;background:var(--primary);
  margin:10px auto 0;border-radius:2px;
}
.section-title p{color:var(--text-muted);font-size:clamp(.9rem,2.5vw,1.05rem)}
section{padding:80px 0}

/* ========== Navigation ========== */
.navbar{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  background:rgba(10,14,39,.92);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);transition:var(--transition);
}
.navbar .container{
  display:flex;align-items:center;justify-content:space-between;
  height:64px;
}
.nav-logo{
  display:flex;align-items:center;gap:10px;font-size:1.25rem;font-weight:700;
  color:var(--text-bright);
}
.nav-logo .logo-icon{
  width:36px;height:36px;border-radius:8px;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  display:flex;align-items:center;justify-content:center;
  font-size:1.1rem;font-weight:900;color:#fff;
}
.nav-links{display:flex;gap:28px;align-items:center}
.nav-links a{
  color:var(--text-muted);font-size:.9rem;font-weight:500;
  transition:var(--transition);position:relative;padding:4px 0;
}
.nav-links a:hover{color:var(--text-bright)}
.nav-links a::after{
  content:'';position:absolute;bottom:0;left:0;width:0;height:2px;
  background:var(--primary);transition:width .3s ease;
}
.nav-links a:hover::after{width:100%}
.nav-download{
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:#fff;padding:8px 22px;border-radius:var(--radius-sm);
  font-size:.9rem;font-weight:600;transition:var(--transition);
  box-shadow:0 2px 12px var(--primary-glow);
}
.nav-download:hover{transform:translateY(-1px);box-shadow:0 4px 20px var(--primary-glow)}

/* Mobile Menu */
.menu-toggle{display:none;flex-direction:column;gap:5px;background:none;padding:4px}
.menu-toggle span{display:block;width:24px;height:2px;background:var(--text-bright);border-radius:1px;transition:var(--transition)}

/* ========== Hero Section ========== */
.hero{
  min-height:100vh;display:flex;align-items:center;
  background:radial-gradient(ellipse at 20% 50%,rgba(255,70,85,.08) 0%,transparent 60%),
             radial-gradient(ellipse at 80% 50%,rgba(15,79,255,.06) 0%,transparent 60%),
             var(--bg-dark);
  padding-top:64px;position:relative;overflow:hidden;
}
.hero::before{
  content:'';position:absolute;top:-50%;right:-20%;width:600px;height:600px;
  background:radial-gradient(circle,rgba(255,70,85,.06) 0%,transparent 70%);
  border-radius:50%;pointer-events:none;
}
.hero .container{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;position:relative}
.hero-content{z-index:1}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  background:rgba(255,70,85,.1);border:1px solid rgba(255,70,85,.25);
  padding:6px 16px;border-radius:20px;font-size:.82rem;color:var(--primary);
  margin-bottom:20px;
}
.hero-badge .dot{width:8px;height:8px;border-radius:50%;background:var(--primary);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
.hero h1{
  font-size:clamp(2rem,5.5vw,3.5rem);font-weight:900;
  color:var(--text-bright);line-height:1.15;margin-bottom:20px;
}
.hero h1 .highlight{color:var(--primary)}
.hero p{font-size:clamp(.95rem,2.5vw,1.15rem);color:var(--text-muted);margin-bottom:32px;max-width:500px}
.hero-buttons{display:flex;gap:16px;flex-wrap:wrap}
.btn-primary{
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:#fff;padding:14px 36px;border-radius:var(--radius-sm);
  font-size:1rem;font-weight:600;transition:var(--transition);
  box-shadow:0 4px 20px var(--primary-glow);display:inline-flex;align-items:center;gap:8px;
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 30px var(--primary-glow)}
.btn-secondary{
  background:transparent;color:var(--text-bright);
  padding:14px 36px;border-radius:var(--radius-sm);font-size:1rem;font-weight:600;
  border:1px solid var(--border);transition:var(--transition);
}
.btn-secondary:hover{border-color:var(--primary);color:var(--primary)}

/* Hero visual - animated cards */
.hero-visual{z-index:1;display:flex;justify-content:center;align-items:center}
.hero-card-stack{position:relative;width:100%;max-width:480px;aspect-ratio:4/3}
.hero-card{
  position:absolute;border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow);border:1px solid var(--border);
  transition:transform .5s ease,opacity .5s ease;
}
.hero-card:nth-child(1){
  width:100%;height:100%;top:0;left:0;z-index:3;
  background:linear-gradient(145deg,#1a1f45,#131736);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;
}
.hero-card:nth-child(2){
  width:85%;height:85%;top:8%;left:8%;z-index:2;
  background:linear-gradient(145deg,#151a3a,#0f1330);
  opacity:.7;transform:rotate(-3deg);
}
.hero-card:nth-child(3){
  width:75%;height:75%;top:12%;left:12%;z-index:1;
  background:linear-gradient(145deg,#101435,#0c1030);
  opacity:.4;transform:rotate(-6deg);
}
.card-icon{font-size:3.5rem;margin-bottom:8px}
.card-title{font-size:1.3rem;font-weight:700;color:var(--text-bright)}
.card-desc{font-size:.85rem;color:var(--text-muted);text-align:center;padding:0 20px}
.feature-tags{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-top:8px}
.feature-tag{
  background:rgba(255,70,85,.1);border:1px solid rgba(255,70,85,.2);
  padding:4px 12px;border-radius:12px;font-size:.75rem;color:var(--primary);
}

/* ========== Three Main Images Section ========== */
.images-section{background:var(--bg-dark);padding:60px 0}
.images-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.image-card{
  position:relative;border-radius:var(--radius);overflow:hidden;
  background:var(--bg-card);border:1px solid var(--border);
  transition:var(--transition);cursor:pointer;
}
.image-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.5)}
.image-placeholder{
  width:100%;aspect-ratio:16/10;display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:12px;
  background:linear-gradient(135deg,#1a1f45,#131736);
}
.image-placeholder .icon{font-size:2.5rem}
.image-placeholder .text{font-size:.85rem;color:var(--text-muted)}
.image-card .caption{
  padding:16px;font-size:.95rem;font-weight:600;color:var(--text-bright);
  border-top:1px solid var(--border);
}
.image-card .subtext{font-size:.8rem;color:var(--text-muted);margin-top:4px;font-weight:400}

/* ========== Features Section ========== */
.features-section{background:linear-gradient(180deg,#0d1230,#0a0e27)}
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.feature-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);padding:32px 24px;
  transition:var(--transition);position:relative;overflow:hidden;
}
.feature-card::before{
  content:'';position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--primary),var(--accent));
  transform:scaleX(0);transition:transform .4s ease;
}
.feature-card:hover::before{transform:scaleX(1)}
.feature-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.4)}
.feature-icon{
  width:56px;height:56px;border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  font-size:1.5rem;margin-bottom:18px;
}
.feature-icon.red{background:rgba(255,70,85,.12)}
.feature-icon.blue{background:rgba(15,79,255,.12)}
.feature-icon.green{background:rgba(46,213,115,.12)}
.feature-icon.orange{background:rgba(255,159,67,.12)}
.feature-icon.purple{background:rgba(155,89,182,.12)}
.feature-icon.cyan{background:rgba(0,210,255,.12)}
.feature-card h3{font-size:1.1rem;color:var(--text-bright);margin-bottom:10px}
.feature-card p{font-size:.88rem;color:var(--text-muted);line-height:1.7}

/* ========== Stats Section ========== */
.stats-section{
  background:linear-gradient(135deg,rgba(255,70,85,.05),rgba(15,79,255,.05)),
  var(--bg-dark);
}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat-item{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);padding:32px 16px;
  transition:var(--transition);
}
.stat-item:hover{border-color:rgba(255,70,85,.3)}
.stat-number{font-size:clamp(1.8rem,4vw,2.5rem);font-weight:900;color:var(--primary);margin-bottom:6px}
.stat-label{font-size:.88rem;color:var(--text-muted)}

/* ========== Download Section ========== */
.download-section{
  background:radial-gradient(ellipse at center,rgba(255,70,85,.06) 0%,transparent 70%),
  var(--bg-dark);text-align:center;
}
.download-box{
  max-width:700px;margin:0 auto;
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:16px;padding:50px 30px;
  position:relative;overflow:hidden;
}
.download-box::before{
  content:'';position:absolute;top:-50%;left:-50%;width:200%;height:200%;
  background:conic-gradient(from 0deg,rgba(255,70,85,.03),rgba(15,79,255,.03),rgba(255,70,85,.03));
  animation:rotate 10s linear infinite;
}
@keyframes rotate{from{transform:rotate(0deg)}to{transform:rotate(360deg)}}
.download-box > *{position:relative;z-index:1}
.download-icon{font-size:3rem;margin-bottom:16px}
.download-box h2{font-size:clamp(1.4rem,3.5vw,1.8rem);color:var(--text-bright);margin-bottom:12px}
.download-box p{color:var(--text-muted);margin-bottom:28px;font-size:.95rem}
.download-btn{
  display:inline-flex;align-items:center;gap:10px;
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:#fff;padding:16px 48px;border-radius:var(--radius-sm);
  font-size:1.1rem;font-weight:700;transition:var(--transition);
  box-shadow:0 4px 24px var(--primary-glow);
}
.download-btn:hover{transform:translateY(-2px) scale(1.02);box-shadow:0 8px 40px var(--primary-glow)}
.download-btn .arrow{transition:transform .3s ease}
.download-btn:hover .arrow{transform:translateX(4px)}
.download-meta{margin-top:20px;display:flex;gap:24px;justify-content:center;flex-wrap:wrap;font-size:.82rem;color:var(--text-muted)}
.download-meta span{display:flex;align-items:center;gap:6px}

/* ========== FAQ Section ========== */
.faq-section{background:var(--bg-dark)}
.faq-list{max-width:800px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.faq-item{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-sm);overflow:hidden;
  transition:var(--transition);
}
.faq-item:hover{border-color:rgba(255,70,85,.2)}
.faq-question{
  padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;
  align-items:center;font-size:1rem;font-weight:600;color:var(--text-bright);
  user-select:none;
}
.faq-question .toggle{font-size:1.4rem;color:var(--primary);transition:transform .3s ease;font-weight:300}
.faq-answer{
  max-height:0;overflow:hidden;transition:max-height .4s ease,padding .3s ease;
  padding:0 24px;
}
.faq-item.active .faq-answer{max-height:300px;padding:0 24px 20px}
.faq-item.active .faq-question .toggle{transform:rotate(45deg)}
.faq-answer p{font-size:.9rem;color:var(--text-muted);line-height:1.8}

/* ========== Deploy Guide Section ========== */
.deploy-section{background:linear-gradient(180deg,#0d1230,#0a0e27)}
.deploy-steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:24px}
.deploy-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);padding:28px 24px;position:relative;
}
.deploy-step{
  position:absolute;top:-14px;left:20px;
  width:28px;height:28px;border-radius:50%;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  color:#fff;font-size:.8rem;font-weight:700;
  display:flex;align-items:center;justify-content:center;
}
.deploy-card h3{font-size:1rem;color:var(--text-bright);margin:10px 0 10px}
.deploy-card p{font-size:.85rem;color:var(--text-muted);line-height:1.7}
.deploy-card code{
  display:inline-block;background:rgba(255,70,85,.08);border:1px solid rgba(255,70,85,.15);
  padding:2px 8px;border-radius:4px;font-size:.82rem;color:var(--primary);
  font-family:'Courier New',monospace;margin:2px 0;
}

/* ========== Footer ========== */
.footer{
  background:#070a1e;border-top:1px solid var(--border);padding:50px 0 24px;
}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-brand p{font-size:.88rem;color:var(--text-muted);margin-top:12px;line-height:1.7}
.footer-col h4{font-size:.9rem;color:var(--text-bright);margin-bottom:14px;font-weight:600}
.footer-col ul li{margin-bottom:8px}
.footer-col ul li a{font-size:.85rem;color:var(--text-muted);transition:var(--transition)}
.footer-col ul li a:hover{color:var(--primary)}
.footer-bottom{
  border-top:1px solid var(--border);padding-top:20px;
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;
}
.footer-bottom p{font-size:.8rem;color:var(--text-muted)}
.footer-links{display:flex;gap:20px}
.footer-links a{font-size:.8rem;color:var(--text-muted);transition:var(--transition)}
.footer-links a:hover{color:var(--primary)}

/* ========== Back to Top ========== */
.back-to-top{
  position:fixed;bottom:30px;right:30px;z-index:999;
  width:44px;height:44px;border-radius:50%;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  color:#fff;font-size:1.2rem;display:none;align-items:center;justify-content:center;
  box-shadow:0 4px 16px rgba(0,0,0,.4);transition:var(--transition);
}
.back-to-top:hover{transform:translateY(-3px)}
.back-to-top.show{display:flex}

/* ========== Responsive ========== */
@media(max-width:1024px){
  .hero .container{grid-template-columns:1fr;text-align:center}
  .hero-content{order:1}
  .hero-visual{order:0;margin-bottom:-40px}
  .hero p{margin:0 auto 32px}
  .hero-buttons{justify-content:center}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .nav-links{
    display:none;position:fixed;top:64px;left:0;right:0;
    background:rgba(10,14,39,.98);backdrop-filter:blur(12px);
    flex-direction:column;padding:20px;gap:16px;
    border-bottom:1px solid var(--border);
  }
  .nav-links.active{display:flex}
  .menu-toggle{display:flex}
  .images-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;text-align:center}
  section{padding:60px 0}
  .download-box{padding:40px 20px}
}
@media(max-width:480px){
  .hero h1{font-size:1.8rem}
  .stats-grid{grid-template-columns:1fr 1fr}
  .hero-buttons{flex-direction:column;align-items:center}
  .btn-primary,.btn-secondary{width:100%;justify-content:center}
  .download-btn{width:100%;justify-content:center;padding:14px 24px}
}

/* ========== Animations ========== */
.fade-in{opacity:0;transform:translateY(30px);transition:opacity .8s ease,transform .8s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}

/* ========== Scrollbar ========== */
::-webkit-scrollbar{width:8px}
::-webkit-scrollbar-track{background:var(--bg-dark)}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:var(--primary)}