/* === Reset & Base === */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  color: #1a1a2e; background: #fff; line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* === Utility === */
.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* === Nav === */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,0.88); backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0,0,0,0.06); transition: box-shadow 0.3s;
}
.nav.scrolled { box-shadow: 0 1px 12px rgba(0,0,0,0.08); }
.nav-inner {
  max-width: 1120px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between; height: 64px;
}
.nav-logo { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 1.15rem; }
.logo-mark { font-size: 1.4rem; color: #2563eb; }
.nav-links { display: flex; gap: 28px; }
.nav-links a { font-size: 0.88rem; color: #555; transition: color 0.2s; font-weight: 450; }
.nav-links a:hover { color: #2563eb; }
.nav-toggle {
  display: none; background: none; border: none; cursor: pointer;
  width: 28px; height: 20px; position: relative;
}
.nav-toggle span {
  position: absolute; left: 0; width: 100%; height: 2px;
  background: #333; border-radius: 2px; transition: 0.3s;
}
.nav-toggle span:nth-child(1) { top: 0; }
.nav-toggle span:nth-child(2) { top: 9px; }
.nav-toggle span:nth-child(3) { top: 18px; }
.nav-toggle.active span:nth-child(1) { top: 9px; transform: rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { top: 9px; transform: rotate(-45deg); }

/* === Hero === */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  overflow: hidden; background: linear-gradient(135deg, #f0f4ff 0%, #e8eeff 50%, #f5f0ff 100%);
}
.hero-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 20% 50%, rgba(37,99,235,0.08), transparent),
    radial-gradient(ellipse 50% 60% at 80% 30%, rgba(139,92,246,0.06), transparent);
}
.hero-content {
  position: relative; z-index: 1;
  max-width: 1120px; margin: 0 auto; padding: 120px 24px 80px;
}
.hero-tagline {
  font-size: 0.82rem; font-weight: 500; color: #2563eb;
  letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 24px;
}
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem); font-weight: 700;
  line-height: 1.2; letter-spacing: -0.02em;
  color: #0f172a; margin-bottom: 24px;
}
.hero-desc {
  font-size: 1.08rem; color: #64748b; max-width: 560px; line-height: 1.8;
  margin-bottom: 40px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* === Buttons === */
.btn {
  display: inline-flex; align-items: center; padding: 12px 28px;
  border-radius: 8px; font-size: 0.95rem; font-weight: 500;
  transition: all 0.25s; cursor: pointer; border: none;
}
.btn-primary { background: #2563eb; color: #fff; }
.btn-primary:hover { background: #1d4ed8; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(37,99,235,0.3); }
.btn-outline { background: transparent; color: #374151; border: 1.5px solid #d1d5db; }
.btn-outline:hover { border-color: #2563eb; color: #2563eb; }

/* === Sections === */
.section { padding: 100px 0; }
.section-alt { background: #f8fafc; }
.section-label {
  font-size: 0.78rem; font-weight: 600; color: #2563eb;
  letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 12px;
}
.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem); font-weight: 700;
  line-height: 1.3; color: #0f172a; margin-bottom: 48px; letter-spacing: -0.01em;
}

/* === About === */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start; }
.about-text p { color: #475569; font-size: 1rem; line-height: 1.9; margin-bottom: 20px; }
.about-text p:last-child { margin-bottom: 0; }
.about-text strong { color: #1e293b; }
.about-highlights { display: flex; flex-direction: column; gap: 20px; padding-top: 4px; }
.highlight {
  display: flex; align-items: flex-start; gap: 16px;
  padding: 20px; border-radius: 10px; background: #fff;
  border: 1px solid #f1f5f9; transition: all 0.3s;
}
.highlight:hover { border-color: #e2e8f0; box-shadow: 0 2px 8px rgba(0,0,0,0.04); }
.highlight-icon { font-size: 1.5rem; flex-shrink: 0; margin-top: 2px; }
.highlight-title { font-size: 0.95rem; font-weight: 600; color: #0f172a; margin-bottom: 2px; }
.highlight-desc { font-size: 0.82rem; color: #94a3b8; }

/* === Product === */
.product-intro {
  font-size: 1.05rem; color: #64748b; max-width: 680px; line-height: 1.8;
  margin-top: -28px; margin-bottom: 40px;
}
.product-features { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; margin-bottom: 48px; }
.pf-card {
  background: #fff; border: 1px solid #e2e8f0; border-radius: 12px;
  padding: 28px 24px; transition: all 0.3s;
}
.pf-card:hover { border-color: #2563eb; box-shadow: 0 8px 24px rgba(37,99,235,0.08); transform: translateY(-2px); }
.pf-icon {
  width: 44px; height: 44px; border-radius: 10px;
  background: #eff6ff; color: #2563eb;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
}
.pf-icon svg { width: 22px; height: 22px; }
.pf-card h3 { font-size: 1.05rem; font-weight: 600; color: #0f172a; margin-bottom: 8px; }
.pf-card p { font-size: 0.88rem; color: #64748b; line-height: 1.7; }

.product-stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 0;
  background: #fff; border-radius: 12px; border: 1px solid #e2e8f0; overflow: hidden;
}
.ps-item { padding: 24px; text-align: center; }
.ps-item:not(:last-child) { border-right: 1px solid #f1f5f9; }
.ps-value { font-size: 1rem; font-weight: 600; color: #0f172a; margin-bottom: 4px; }
.ps-label { font-size: 0.8rem; color: #94a3b8; }

/* === Team === */
.team-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.team-card {
  padding: 28px; border-radius: 12px; border: 1px solid #e2e8f0;
  background: #fff; transition: all 0.3s;
}
.team-card:hover { border-color: #c7d2fe; box-shadow: 0 4px 16px rgba(37,99,235,0.06); }
.team-role { font-size: 0.78rem; font-weight: 500; color: #2563eb; letter-spacing: 0.04em; margin-bottom: 8px; }
.team-name { font-size: 1.2rem; font-weight: 700; color: #0f172a; margin-bottom: 12px; }
.team-bg p { font-size: 0.85rem; color: #64748b; line-height: 1.7; margin-bottom: 4px; }
.team-skills { color: #94a3b8 !important; font-size: 0.8rem !important; margin-top: 8px !important; }

/* === Philosophy === */
.philosophy-content { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 28px; }
.philo-block {}
.philo-num {
  font-size: 2.8rem; font-weight: 800; color: #e2e8f0; line-height: 1;
  margin-bottom: 12px; letter-spacing: -0.02em;
}
.philo-block h3 { font-size: 1.05rem; font-weight: 600; color: #0f172a; margin-bottom: 8px; }
.philo-block p { font-size: 0.9rem; color: #64748b; line-height: 1.8; }

/* === Contact === */
.contact-desc { font-size: 1.05rem; color: #64748b; max-width: 480px; margin-bottom: 40px; }
.contact-grid { display: flex; gap: 40px; flex-wrap: wrap; }
.contact-item { display: flex; align-items: center; gap: 16px; }
.contact-icon {
  width: 48px; height: 48px; border-radius: 10px;
  background: #eff6ff; color: #2563eb;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.contact-icon svg { width: 22px; height: 22px; }
.contact-label { font-size: 0.8rem; color: #94a3b8; margin-bottom: 2px; }
.contact-value { font-size: 1rem; font-weight: 500; color: #0f172a; }

/* === Footer === */
.footer { padding: 32px 0; border-top: 1px solid #e2e8f0; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; }
.footer-brand { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: 1rem; color: #0f172a; }
.footer-copy { font-size: 0.82rem; color: #94a3b8; }
.footer-copy a { color: #94a3b8; transition: color 0.2s; }
.footer-copy a:hover { color: #64748b; }

/* === Mobile === */
@media (max-width: 768px) {
  .nav-links {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    background: #fff; flex-direction: column; padding: 16px 24px;
    border-bottom: 1px solid #e2e8f0; gap: 0;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 0; font-size: 1rem; }
  .nav-toggle { display: block; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-content { padding: 100px 24px 60px; }
  .hero-actions { flex-direction: column; }
  .btn { justify-content: center; }
  .product-stats { grid-template-columns: repeat(2, 1fr); }
  .ps-item:nth-child(2) { border-right: none; }
  .team-grid { grid-template-columns: 1fr; }
}

/* === Product link === */
.product-header { display: flex; align-items: flex-end; gap: 20px; flex-wrap: wrap; margin-bottom: 40px; }
.product-header .product-intro { flex: 1; min-width: 280px; }
.product-link { align-self: flex-end; margin-bottom: 8px; white-space: nowrap; }

/* === Wechat QR === */
.contact-qr { text-align: center; }
.qr-img { width: 120px; height: 120px; border-radius: 8px; border: 1px solid #e2e8f0; margin-bottom: 8px; }
.qr-text { font-size: 0.82rem; color: #64748b; }

/* === Services Grid === */
.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
.svc-card {
  padding: 28px 24px; border-radius: 12px; border: 1px solid #e2e8f0;
  background: #fff; transition: all 0.3s;
}
.svc-card:hover { border-color: #2563eb; box-shadow: 0 8px 24px rgba(37,99,235,0.08); transform: translateY(-2px); }
.svc-icon { font-size: 2rem; margin-bottom: 16px; }
.svc-card h3 { font-size: 1.05rem; font-weight: 600; color: #0f172a; margin-bottom: 8px; }
.svc-card p { font-size: 0.88rem; color: #64748b; line-height: 1.7; }

/* === Investment === */
.invest-intro { max-width: 720px; margin-bottom: 48px; }
.invest-intro p { font-size: 1.05rem; color: #475569; line-height: 1.9; }
.invest-highlights { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; margin-bottom: 48px; border-radius: 12px; border: 1px solid #e2e8f0; overflow: hidden; background: #f8fafc; }
.ih-card { padding: 28px 20px; text-align: center; }
.ih-card:not(:last-child) { border-right: 1px solid #e2e8f0; }
.ih-num { font-size: 2rem; font-weight: 800; color: #0f172a; line-height: 1.2; }
.ih-unit { font-size: 0.9rem; font-weight: 500; color: #64748b; margin-left: 2px; }
.ih-label { font-size: 0.82rem; color: #94a3b8; margin-top: 6px; }
.invest-details { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 28px; margin-bottom: 48px; }
.id-block h3 { font-size: 1.05rem; font-weight: 600; color: #0f172a; margin-bottom: 14px; padding-bottom: 10px; border-bottom: 2px solid #eff6ff; }
.id-block ul { list-style: none; }
.id-block li { font-size: 0.9rem; color: #475569; line-height: 1.8; padding-left: 20px; position: relative; margin-bottom: 6px; }
.id-block li::before { content: ""; position: absolute; left: 0; top: 10px; width: 6px; height: 6px; border-radius: 50%; background: #2563eb; }
.id-block li strong { color: #0f172a; }
.invest-cta { text-align: center; padding: 40px; background: #fff; border-radius: 12px; border: 1px solid #e2e8f0; }
.invest-cta p { font-size: 1rem; color: #64748b; margin-bottom: 20px; }

@media (max-width: 768px) {
  .invest-highlights { grid-template-columns: repeat(2, 1fr); }
  .ih-card:nth-child(2) { border-right: none; }
}