/* ═══════════════ RESET ═══════════════ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#334155;background:#f8fafc;line-height:1.6;-webkit-font-smoothing:antialiased;font-weight:400}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

/* ═══════════════ ANIMATIONS ═══════════════ */
@keyframes fadeUp{
  from{opacity:0;transform:translateY(24px)}
  to{opacity:1;transform:translateY(0)}
}
@keyframes fadeIn{
  from{opacity:0}
  to{opacity:1}
}
@keyframes float{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-12px)}
}
@keyframes heroEnter{
  from{opacity:0;transform:translateY(20px)}
  to{opacity:1;transform:translateY(0)}
}
.reveal{opacity:0}
.reveal.visible{animation:fadeUp .6s ease forwards}
.reveal-delay-1{animation-delay:.1s}
.reveal-delay-2{animation-delay:.2s}
.reveal-delay-3{animation-delay:.3s}
.reveal-delay-4{animation-delay:.4s}
.reveal-delay-5{animation-delay:.5s}

/* ═══════════════ NAVBAR ═══════════════ */
.navbar{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:64px;
  background:rgba(255,255,255,0.92);
  backdrop-filter:blur(16px);
  border-bottom:1px solid #e2e8f0;
  display:flex;align-items:center;
  padding:0 32px;
}
.nav-inner{
  width:100%;max-width:1200px;
  margin:0 auto;
  display:flex;align-items:center;justify-content:space-between;
}
.nav-brand{
  display:flex;align-items:center;gap:12px;
  font-size:20px;font-weight:700;
  color:#1e3a5f;
}
.nav-logo{
  width:36px;height:36px;
  flex-shrink:0;
}
.nav-logo svg{width:100%;height:100%}
.nav-brand .dot{color:#2563eb}
.nav-links{display:flex;align-items:center;gap:28px;list-style:none}
.nav-links a{font-size:14px;font-weight:500;color:#4a5568;transition:color .15s}
.nav-links a:hover{color:#2563eb}
.nav-btn{
  background:#2563eb;color:#fff !important;
  padding:8px 20px;border-radius:8px;
  font-weight:600 !important;
  transition:background .15s,transform .15s !important;
}
.nav-btn:hover{background:#1d4ed8;transform:translateY(-1px)}

/* ═══════════════ HERO ═══════════════ */
.hero{
  padding:160px 24px 48px;
  text-align:center;
  position:relative;
  overflow:hidden;
}
.hero::before{
  content:"";position:absolute;
  top:-40%;left:50%;transform:translateX(-50%);
  width:900px;height:900px;
  background:radial-gradient(ellipse,rgba(37,99,235,0.06) 0%,transparent 60%);
  pointer-events:none;
  animation:float 8s ease-in-out infinite;
}
.hero::after{
  content:"";position:absolute;
  top:20%;right:-30%;
  width:600px;height:600px;
  background:radial-gradient(ellipse,rgba(6,182,212,0.05) 0%,transparent 60%);
  pointer-events:none;
  animation:float 6s ease-in-out infinite reverse;
}
.hero-status{animation:heroEnter .5s ease forwards}
.hero h1{animation:heroEnter .5s .1s ease forwards;opacity:0}
.hero-tagline{animation:heroEnter .5s .2s ease forwards;opacity:0}
.hero-cta{animation:heroEnter .5s .3s ease forwards;opacity:0}
.hero-status{
  display:inline-flex;align-items:center;gap:8px;
  background:#dbeafe;color:#1e40af;
  font-size:13px;font-weight:600;
  padding:6px 16px;border-radius:20px;
  margin-bottom:32px;
}
.hero-status::before{
  content:"";width:8px;height:8px;
  background:#22c55e;border-radius:50%;
  animation:pulse 2s ease-in-out infinite;
}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
.hero h1{
  font-size:clamp(42px,8vw,80px);
  font-weight:800;
  line-height:1.15;
  letter-spacing:-0.03em;
  color:#1e3a5f;
  margin-bottom:12px;
}
.hero h1 span{
  background:linear-gradient(135deg,#2563eb,#06b6d4);
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
}
.hero-tagline{
  font-size:18px;color:#5a6d80;
  margin-bottom:28px;
  font-weight:400;
}
.hero-price{
  display:inline-flex;align-items:baseline;gap:6px;
  background:#f1f5f9;
  padding:12px 28px;border-radius:12px;
  margin-bottom:44px;
}
.hero-price-label{font-size:14px;color:#94a3b8}
.hero-price-num{font-size:28px;font-weight:800;color:#1e3a5f}
.hero-price-unit{font-size:14px;color:#5a6d80}
.hero-cta{
  display:inline-flex;align-items:center;gap:10px;
  background:linear-gradient(135deg,#2563eb,#06b6d4);
  color:#fff;font-size:16px;font-weight:700;
  padding:14px 36px;border-radius:12px;
  box-shadow:0 8px 28px rgba(37,99,235,0.28);
  transition:transform .15s,box-shadow .15s;
}
.hero-cta:hover{transform:translateY(-2px);box-shadow:0 12px 36px rgba(37,99,235,0.36)}
.hero-cta svg{width:20px;height:20px;fill:currentColor}

/* ═══════════════ FEATURES ═══════════════ */
.section{padding:48px 24px 80px;scroll-margin-top:64px}
.section-inner{max-width:1100px;margin:0 auto}
.section-label{
  text-align:center;font-size:14px;font-weight:600;
  color:#2563eb;letter-spacing:.06em;
  margin-bottom:16px;
  position:relative;
}
.section-label::after{
  content:"";display:block;
  width:40px;height:3px;
  background:linear-gradient(90deg,#2563eb,#06b6d4);
  border-radius:2px;margin:12px auto 0;
}
.section-title{
  text-align:center;font-size:32px;font-weight:800;
  color:#0f1a2e;margin-bottom:56px;
  letter-spacing:.02em;
}
.features{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:20px;
}
.feature-card{
  background:#fff;
  border:1px solid #e8ecf2;
  border-radius:20px;
  padding:40px 28px 36px;
  transition:all .3s cubic-bezier(.25,.8,.25,1);
  position:relative;
  overflow:hidden;
}
.feature-card::before{
  content:"";position:absolute;
  top:0;left:0;right:0;
  height:3px;
  background:linear-gradient(90deg,#2563eb,#06b6d4);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .3s ease;
}
.feature-card:hover::before{transform:scaleX(1)}
.feature-card:hover{
  border-color:#c8d6e5;
  box-shadow:0 16px 40px rgba(37,99,235,0.1),0 2px 8px rgba(0,0,0,0.04);
  transform:translateY(-4px);
}
.feature-icon{
  width:56px;height:56px;
  border-radius:16px;
  display:flex;align-items:center;justify-content:center;
  margin-bottom:24px;
  position:relative;
  z-index:1;
}
.feature-icon::after{
  content:"";position:absolute;
  inset:-6px;
  border-radius:22px;
  background:inherit;
  opacity:.15;
  z-index:-1;
}
.feature-card:nth-child(1) .feature-icon{background:linear-gradient(135deg,#dbeafe,#bfdbfe)}
.feature-card:nth-child(2) .feature-icon{background:linear-gradient(135deg,#d1fae5,#a7f3d0)}
.feature-card:nth-child(3) .feature-icon{background:linear-gradient(135deg,#fef3c7,#fde68a)}
.feature-card:nth-child(4) .feature-icon{background:linear-gradient(135deg,#ede9fe,#c4b5fd)}
.feature-icon svg{width:26px;height:26px;stroke-width:2}
.feature-card:nth-child(1) .feature-icon svg{stroke:#2563eb}
.feature-card:nth-child(2) .feature-icon svg{stroke:#059669}
.feature-card:nth-child(3) .feature-icon svg{stroke:#d97706}
.feature-card:nth-child(4) .feature-icon svg{stroke:#7c3aed}
.feature-card h3{font-size:17px;font-weight:700;color:#0f1a2e;margin-bottom:10px;letter-spacing:.01em}
.feature-card p{font-size:14px;color:#5a6d80;line-height:1.75;font-weight:400}

/* ═══════════════ DOMAIN STATS ═══════════════ */
.stats-row{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:0;
  max-width:780px;margin:0 auto 56px;
  background:#fff;
  border:1px solid #e8ecf2;
  border-radius:20px;
  padding:8px 0;
  box-shadow:0 2px 12px rgba(0,0,0,0.03);
}
.stat-item{
  text-align:center;
  padding:20px 16px;
  position:relative;
}
.stat-item:not(:last-child)::after{
  content:"";position:absolute;
  right:0;top:50%;transform:translateY(-50%);
  width:1px;height:40px;
  background:#e8ecf2;
}
.stat-num{font-size:30px;font-weight:800;color:#0f1a2e;line-height:1.1;font-variant-numeric:tabular-nums}
.stat-label{font-size:12px;color:#94a3b8;margin-top:6px;font-weight:500;letter-spacing:.03em}
.stat-item:nth-child(1) .stat-num{background:linear-gradient(135deg,#2563eb,#06b6d4);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.stat-item:nth-child(3) .stat-num{background:linear-gradient(135deg,#2563eb,#06b6d4);-webkit-background-clip:text;-webkit-text-fill-color:transparent}

/* ═══════════════ WHY SECTION ═══════════════ */
.why-section{
  background:linear-gradient(180deg,#fff 0%,#f0f6ff 100%);
  border-top:1px solid #e2e8f0;
  position:relative;
  overflow:hidden;
}
.why-section::before{
  content:"";position:absolute;
  top:-30%;right:-10%;
  width:500px;height:500px;
  background:radial-gradient(ellipse,rgba(37,99,235,0.04) 0%,transparent 60%);
  pointer-events:none;
}
.why-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
  gap:20px;
}
.why-item{
  background:#fff;
  border:1px solid #e8ecf2;
  border-radius:16px;
  padding:28px 28px 28px 24px;
  display:flex;gap:18px;
  align-items:flex-start;
  transition:all .25s ease;
  position:relative;
}
.why-item:hover{
  border-color:#c8d6e5;
  box-shadow:0 8px 28px rgba(37,99,235,0.08),0 2px 6px rgba(0,0,0,0.03);
  transform:translateY(-3px);
}
.why-num{
  flex-shrink:0;width:44px;height:44px;
  background:linear-gradient(135deg,#2563eb,#06b6d4);
  color:#fff;
  border-radius:14px;
  display:flex;align-items:center;justify-content:center;
  font-size:18px;font-weight:800;
  box-shadow:0 4px 14px rgba(37,99,235,0.25);
}
.why-item h4{font-size:17px;font-weight:700;color:#0f1a2e;margin-bottom:6px;letter-spacing:.01em}
.why-item p{font-size:14px;color:#5a6d80;line-height:1.75;font-weight:400}

/* ═══════════════ CONTACT ═══════════════ */
.contact-section{
  background:linear-gradient(180deg,#f8fafc 0%,#eff6ff 100%);
  padding:80px 24px;
}
.contact-card{
  max-width:520px;margin:0 auto;
  background:#fff;
  border:1px solid #e2e8f0;
  border-radius:20px;
  padding:48px;
  text-align:center;
  box-shadow:0 4px 24px rgba(0,0,0,0.04);
}
.contact-card h2{font-size:24px;font-weight:800;color:#1e3a5f;margin-bottom:8px}
.contact-card .sub{font-size:14px;color:#94a3b8;margin-bottom:32px}
.qq-display{
  display:flex;align-items:center;justify-content:center;gap:12px;
  background:#f1f5f9;
  border-radius:12px;padding:14px 20px;
  margin-bottom:20px;
}
.qq-label{font-size:13px;color:#94a3b8}
.qq-num{font-size:20px;font-weight:700;color:#1e3a5f;letter-spacing:.03em}
.copy-link{
  font-size:13px;font-weight:600;color:#2563eb;
  cursor:pointer;user-select:none;
  transition:color .15s;
}
.copy-link:hover{color:#1d4ed8}
.contact-btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.contact-btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 28px;border-radius:10px;
  font-size:15px;font-weight:600;
  cursor:pointer;border:none;
  transition:transform .15s,box-shadow .15s;
}
.contact-btn:hover{transform:translateY(-1px)}
.btn-primary{
  background:linear-gradient(135deg,#2563eb,#06b6d4);
  color:#fff;
  box-shadow:0 6px 20px rgba(37,99,235,0.22);
}
.btn-primary:hover{box-shadow:0 10px 28px rgba(37,99,235,0.32)}
.btn-outline{
  background:#fff;color:#2563eb;
  border:2px solid #2563eb;
}
.btn-outline:hover{background:#eff6ff}
.btn-primary svg,.btn-outline svg{width:18px;height:18px;fill:currentColor}

/* ═══════════════ FOOTER ═══════════════ */
.footer{
  background:#1e3a5f;color:#bccfde;
  padding:56px 24px 32px;
}
.footer-inner{
  max-width:1100px;margin:0 auto;
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1fr;
  gap:48px;
}
.footer-brand-name{
  font-size:22px;font-weight:800;color:#fff;
  margin-bottom:12px;
}
.footer-brand-name span{color:#3b82f6}
.footer-brand p{font-size:13px;line-height:1.8;color:#a3bdd4}
.footer-col h4{
  font-size:13px;font-weight:700;color:#e8edf3;
  margin-bottom:16px;text-transform:uppercase;letter-spacing:.04em;
}
.footer-col ul{list-style:none}
.footer-col li{margin-bottom:10px}
.footer-col a{font-size:13px;color:#bccfde;transition:color .15s}
.footer-col a:hover{color:#fff}
.footer-bottom{
  max-width:1100px;margin:40px auto 0;
  padding-top:24px;
  border-top:1px solid rgba(255,255,255,0.15);
  display:flex;justify-content:space-between;align-items:center;
  flex-wrap:wrap;gap:16px;
}
.footer-bottom span{font-size:12px;color:#a3bdd4}
.footer-social{display:flex;gap:12px}
.footer-social a{
  width:36px;height:36px;
  border-radius:8px;
  background:rgba(255,255,255,0.1);
  display:flex;align-items:center;justify-content:center;
  transition:background .15s,transform .15s;
}
.footer-social a:hover{background:rgba(255,255,255,0.2);transform:translateY(-2px)}
.footer-social svg{width:18px;height:18px;fill:#bccfde}

/* ═══════════════ RESPONSIVE ═══════════════ */
@media(max-width:860px){
  .footer-inner{grid-template-columns:1fr 1fr;gap:32px}
  .stats-row{grid-template-columns:1fr 1fr}
  .stat-item:not(:last-child)::after{display:none}
}
@media(max-width:640px){
  .nav-links{display:none}
  .navbar{padding:0 20px}
  .hero{padding:120px 20px 60px}
  .hero h1{font-size:36px}
  .features{grid-template-columns:1fr}
  .why-grid{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;text-align:center}
  .contact-card{padding:32px 24px}
  .contact-btns{flex-direction:column}
  .contact-btn{justify-content:center}
}