/* ===== Variables ===== */
:root {
  --primary: #3860f4;
  --primary-dark: #2950d4;
  --primary-light: #e8f0ff;
  --brand: #4b3fe3;
  --dark: #0a1633;
  --dark-2: #1D273F;
  --gray-900: #171717;
  --gray-700: #404040;
  --gray-500: #50627f;
  --gray-300: #eef0f6;
  --gray-100: #f5f5f5;
  --gray-50: #fafafa;
  --white: #fff;
  --success: #26a57b;
  --radius: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 24px rgba(56,96,244,0.1);
  --shadow-lg: 0 8px 40px rgba(56,96,244,0.15);
  --transition: all 0.3s cubic-bezier(0,0,0.2,1);
  --max-width: 1346px;
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", tahoma, arial, sans-serif;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font); color: var(--gray-900); background: var(--white); line-height: 1.6; overflow-x: hidden; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ===== Header ===== */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: 70px; background: rgba(255,255,255,0.98);
  border-bottom: 1px solid var(--gray-300);
  transition: var(--transition);
}
.header.scrolled { box-shadow: var(--shadow-sm); }
.header-inner {
  max-width: var(--max-width); margin: 0 auto; height: 100%;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px;
}
.header-logo { display: flex; align-items: center; gap: 10px; }
.logo-img { width: 36px; height: 36px; object-fit: contain; border-radius: 8px; }
.logo-text {
  font-size: 20px;
  font-weight: 800;
  background: linear-gradient(135deg, #5b8def 0%, #3860f4 50%, #2950d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 1px;
}
.header-nav { display: flex; align-items: center; gap: 36px; }
.nav-item { position: relative; }
.nav-label {
  font-size: 16px; font-weight: 400; color: var(--dark-2);
  transition: var(--transition); display: flex; align-items: center; gap: 4px;
  border-bottom: 2px solid transparent; padding-bottom: 4px;
}
.nav-label:hover { color: var(--primary); font-weight: 500; }
.nav-arrow {
  width: 0; height: 0; border-left: 4px solid transparent;
  border-right: 4px solid transparent; border-top: 4px solid currentColor;
  transition: var(--transition);
}
.nav-item:hover .nav-arrow { transform: rotate(180deg); }
.nav-dropdown {
  position: absolute; top: 100%; left: -20px;
  min-width: 500px; background: var(--white);
  border-radius: var(--radius-md); box-shadow: var(--shadow-lg);
  padding: 24px; opacity: 0; visibility: hidden;
  transform: translateY(10px); transition: var(--transition);
}
.nav-item:hover .nav-dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.dropdown-grid.two-col { grid-template-columns: repeat(2, 1fr); }
.dropdown-col h4 { font-size: 13px; font-weight: 600; color: var(--gray-500); margin-bottom: 12px; text-transform: uppercase; letter-spacing: 0.5px; }
.dropdown-col a { display: block; font-size: 14px; color: var(--gray-700); padding: 6px 0; transition: var(--transition); }
.dropdown-col a:hover { color: var(--primary); }
.header-right { display: flex; align-items: center; gap: 12px; }
.btn-nav-outline {
  padding: 8px 20px; border-radius: var(--radius); font-size: 14px; font-weight: 500;
  border: 1px solid var(--gray-300); color: var(--dark-2); transition: var(--transition);
}
.btn-nav-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-nav-primary {
  padding: 8px 20px; border-radius: var(--radius); font-size: 14px; font-weight: 500;
  background: var(--primary); color: var(--white); transition: var(--transition);
}
.btn-nav-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: var(--shadow-md); }

/* ===== Banner ===== */
.banner-section {
  position: relative; margin-top: 70px; height: 520px; overflow: hidden;
}
.banner-slides { position: relative; width: 100%; height: 100%; }
.banner-slide {
  position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  display: flex; align-items: center; opacity: 0;
  transition: opacity 0.6s ease; pointer-events: none;
}
.banner-slide.active { opacity: 1; pointer-events: auto; }
.banner-content {
  max-width: var(--max-width); margin: 0 auto; width: 100%;
  padding: 0 60px; display: flex; align-items: center; justify-content: space-between;
}
.banner-text { flex: 1; }
.banner-title { font-size: 44px; font-weight: 700; color: var(--dark-2); line-height: 1.3; margin-bottom: 16px; }
.banner-title.light { color: var(--white); }
.banner-desc { font-size: 18px; color: var(--gray-500); line-height: 1.7; margin-bottom: 28px; max-width: 580px; }
.banner-desc.light { color: rgba(255,255,255,0.85); }
.banner-actions { display: flex; gap: 16px; }
.btn-banner-primary {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0 28px; height: 48px; border-radius: 10px;
  font-size: 16px; font-weight: 500; background: var(--primary); color: var(--white);
  transition: var(--transition);
}
.btn-banner-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-banner-outline {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0 28px; height: 48px; border-radius: 10px;
  font-size: 16px; font-weight: 500; border: 1px solid var(--dark-2);
  color: var(--dark-2); background: transparent; transition: var(--transition);
}
.btn-banner-outline:hover { background: var(--dark-2); color: var(--white); }
.btn-banner-outline.light-outline { border-color: rgba(255,255,255,0.5); color: var(--white); }
.btn-banner-outline.light-outline:hover { background: rgba(255,255,255,0.15); border-color: var(--white); }
.banner-stats { display: flex; gap: 40px; flex-wrap: wrap; }
.bs-item { text-align: center; }
.bs-num { font-size: 28px; font-weight: 700; color: var(--primary); }
.bs-label { font-size: 13px; color: var(--gray-500); margin-top: 4px; }
.banner-dots {
  position: absolute; bottom: 24px; left: 50%; transform: translateX(-50%);
  display: flex; gap: 8px; z-index: 10;
}
.banner-dots .dot {
  width: 8px; height: 8px; border-radius: 4px; background: rgba(0,0,0,0.2);
  transition: var(--transition); cursor: pointer;
}
.banner-dots .dot.active { width: 24px; background: var(--primary); }
.banner-arrow {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 44px; height: 44px; border-radius: 50%;
  background: rgba(255,255,255,0.8); z-index: 10;
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition); opacity: 0;
}
.banner-section:hover .banner-arrow { opacity: 1; }
.banner-arrow:hover { background: var(--white); box-shadow: var(--shadow-md); }
.banner-prev { left: 24px; }
.banner-next { right: 24px; }
.banner-prev::before {
  content: ''; width: 10px; height: 10px;
  border-left: 2px solid var(--dark-2); border-bottom: 2px solid var(--dark-2);
  transform: rotate(45deg); margin-left: 3px;
}
.banner-next::before {
  content: ''; width: 10px; height: 10px;
  border-right: 2px solid var(--dark-2); border-top: 2px solid var(--dark-2);
  transform: rotate(45deg); margin-right: 3px;
}

/* ===== Promo Bar ===== */
.promo-bar { padding: 24px 0; background: var(--white); border-bottom: 1px solid var(--gray-300); }
.promo-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.promo-item {
  display: flex; align-items: center; gap: 16px; padding: 16px 20px;
  border-radius: var(--radius-md); transition: var(--transition); border: 1px solid transparent;
}
.promo-item:hover { background: var(--gray-50); border-color: var(--gray-300); transform: translateY(-2px); }
.promo-icon { width: 48px; height: 48px; border-radius: 10px; flex-shrink: 0; display: flex; align-items: center; justify-content: center; }
.promo-icon svg { width: 26px; height: 26px; }
.promo-1 { background: linear-gradient(135deg, #e8f0ff, #d9e4ff); }
.promo-2 { background: linear-gradient(135deg, #eef3ff, #dde6ff); }
.promo-3 { background: linear-gradient(135deg, #f0f3ff, #e0e6ff); }
.promo-4 { background: linear-gradient(135deg, #eaf0ff, #dae4ff); }
.promo-info h4 { font-size: 16px; font-weight: 600; color: var(--dark-2); margin-bottom: 2px; }
.promo-info p { font-size: 13px; color: var(--gray-500); }

/* ===== Section ===== */
.section { padding: 80px 0; }
.section-gray { background: var(--gray-100); }
.section-header { text-align: center; margin-bottom: 48px; }
.section-title { font-size: 32px; font-weight: 700; color: var(--dark-2); margin-bottom: 12px; }
.section-subtitle { font-size: 16px; color: var(--gray-500); }

/* ===== Why ===== */
.section-why { background: linear-gradient(180deg, var(--gray-100) 0%, var(--white) 100%); }
.why-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.why-card {
  background: var(--white); border-radius: var(--radius-lg); padding: 36px 28px;
  border: 1px solid var(--gray-300); transition: var(--transition);
}
.why-card:hover { border-color: var(--primary); box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.why-icon { width: 56px; height: 56px; border-radius: 12px; margin-bottom: 20px; display: flex; align-items: center; justify-content: center; }
.why-icon svg { width: 30px; height: 30px; }
.why-1 { background: linear-gradient(135deg, #e8f0ff, #d9e4ff); }
.why-2 { background: linear-gradient(135deg, #eef3ff, #dde6ff); }
.why-3 { background: linear-gradient(135deg, #f0f3ff, #e0e6ff); }
.why-4 { background: linear-gradient(135deg, #eaf0ff, #dae4ff); }
.why-card h3 { font-size: 18px; font-weight: 600; color: var(--dark-2); margin-bottom: 8px; }
.why-card p { font-size: 14px; color: var(--gray-500); line-height: 1.7; }

/* ===== Products ===== */
.section-products { background: var(--white); }
.product-tabs { display: flex; gap: 8px; justify-content: center; margin-bottom: 40px; flex-wrap: wrap; }
.ptab-btn {
  padding: 10px 28px; border-radius: 24px; border: 1px solid var(--gray-300);
  background: var(--white); font-size: 15px; font-weight: 500;
  color: var(--gray-700); transition: var(--transition);
}
.ptab-btn:hover { border-color: var(--primary); color: var(--primary); }
.ptab-btn.active { background: var(--primary); color: var(--white); border-color: var(--primary); }
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.product-card[data-cat="infra"], .product-card[data-cat="network"], .product-card[data-cat="security"], .product-card[data-cat="cloud"] { }
.product-card {
  background: var(--white); border-radius: var(--radius-lg); padding: 28px 24px;
  border: 1px solid var(--gray-300); transition: var(--transition); display: flex; flex-direction: column;
}
.product-card:hover { border-color: var(--primary); box-shadow: var(--shadow-md); transform: translateY(-4px); }
.product-card.hidden { display: none; }
.pcard-icon { width: 48px; height: 48px; border-radius: 10px; margin-bottom: 16px; display: flex; align-items: center; justify-content: center; color: #3860f4; }
.pcard-icon svg { width: 26px; height: 26px; }
.pc-idc { background: linear-gradient(135deg, #e8f0ff, #d9e4ff); }
.pc-host { background: linear-gradient(135deg, #eef3ff, #dde6ff); }
.pc-bm { background: linear-gradient(135deg, #f0f3ff, #e0e6ff); }
.pc-rack { background: linear-gradient(135deg, #eaf0ff, #dae4ff); }
.pc-cdn { background: linear-gradient(135deg, #e8f0ff, #d9e4ff); }
.pc-bgp { background: linear-gradient(135deg, #eef3ff, #dde6ff); }
.pc-isp { background: linear-gradient(135deg, #f0f3ff, #e0e6ff); }
.pc-eip { background: linear-gradient(135deg, #eaf0ff, #dae4ff); }
.pc-ddos { background: linear-gradient(135deg, #e8f0ff, #d9e4ff); }
.pc-waf { background: linear-gradient(135deg, #eef3ff, #dde6ff); }
.pc-ops { background: linear-gradient(135deg, #f0f3ff, #e0e6ff); }
.pc-mon { background: linear-gradient(135deg, #eaf0ff, #dae4ff); }
.pc-hybrid { background: linear-gradient(135deg, #e8f0ff, #d9e4ff); }
.pc-private { background: linear-gradient(135deg, #eef3ff, #dde6ff); }
.pc-si { background: linear-gradient(135deg, #f0f3ff, #e0e6ff); }
.pc-dev { background: linear-gradient(135deg, #eaf0ff, #dae4ff); }
.pcard-name { font-size: 18px; font-weight: 600; color: var(--dark-2); margin-bottom: 8px; }
.pcard-tags { display: flex; gap: 6px; margin-bottom: 8px; }
.pcard-tags span { font-size: 12px; padding: 2px 8px; border-radius: 4px; background: var(--primary-light); color: var(--primary); }
.pcard-desc { font-size: 14px; color: var(--gray-500); line-height: 1.6; margin-bottom: 16px; flex: 1; }
.pcard-links { display: flex; align-items: center; gap: 12px; }
.pcard-btn {
  padding: 6px 16px; border-radius: var(--radius); font-size: 13px; font-weight: 500;
  background: var(--primary); color: var(--white); transition: var(--transition);
}
.pcard-btn:hover { background: var(--primary-dark); }
.pcard-text-link { font-size: 13px; color: var(--gray-500); transition: var(--transition); }
.pcard-text-link:hover { color: var(--primary); }

/* ===== Solutions ===== */
.section-solutions { background: var(--gray-100); }
.solution-tabs { display: flex; gap: 8px; justify-content: center; margin-bottom: 40px; flex-wrap: wrap; }
.stab-btn {
  padding: 10px 28px; border-radius: 24px; border: 1px solid var(--gray-300);
  background: var(--white); font-size: 15px; font-weight: 500;
  color: var(--gray-700); transition: var(--transition);
}
.stab-btn:hover { border-color: var(--primary); color: var(--primary); }
.stab-btn.active { background: var(--primary); color: var(--white); border-color: var(--primary); }
.solution-panel { display: none; }
.solution-panel.active { display: block; animation: fadeIn 0.4s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
.solution-layout {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center;
  background: var(--white); border-radius: var(--radius-lg);
  padding: 40px; border: 1px solid var(--gray-300); box-shadow: var(--shadow-sm);
}
.solution-info h3 { font-size: 24px; font-weight: 700; color: var(--dark-2); margin-bottom: 12px; }
.solution-info p { font-size: 15px; color: var(--gray-500); margin-bottom: 24px; }
.solution-points { display: flex; flex-direction: column; gap: 14px; margin-bottom: 24px; }
.sp-item { display: flex; align-items: center; gap: 12px; }
.sp-dot { width: 20px; height: 20px; border-radius: 50%; background: var(--primary-light); position: relative; flex-shrink: 0; }
.sp-dot::after { content: ''; position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%); width: 8px; height: 8px; border-radius: 50%; background: var(--primary); }
.sp-item span:last-child { font-size: 15px; color: var(--gray-700); }
.solution-actions { display: flex; gap: 12px; margin-bottom: 24px; }
.btn-solution-primary {
  padding: 0 24px; height: 44px; display: inline-flex; align-items: center; justify-content: center;
  border-radius: var(--radius); font-size: 14px; font-weight: 500;
  background: var(--primary); color: var(--white); transition: var(--transition);
}
.btn-solution-primary:hover { background: var(--primary-dark); }
.btn-solution-outline {
  padding: 0 24px; height: 44px; display: inline-flex; align-items: center; justify-content: center;
  border-radius: var(--radius); font-size: 14px; font-weight: 500;
  border: 1px solid var(--gray-300); color: var(--gray-700); transition: var(--transition);
}
.btn-solution-outline:hover { border-color: var(--primary); color: var(--primary); }
.solution-related { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.related-label { font-size: 14px; color: var(--gray-500); }
.solution-related a { font-size: 14px; color: var(--primary); padding: 4px 12px; border: 1px solid var(--gray-300); border-radius: var(--radius); transition: var(--transition); }
.solution-related a:hover { border-color: var(--primary); background: var(--primary-light); }
.solution-visual { display: flex; flex-direction: column; gap: 16px; }
.sv-card {
  background: linear-gradient(135deg, var(--primary-light), #f0f7ff);
  border-radius: var(--radius-lg); padding: 24px 32px;
  font-size: 16px; font-weight: 600; color: var(--primary-dark);
  border-left: 4px solid var(--primary); transition: var(--transition);
}
.sv-card:hover { transform: translateX(8px); background: var(--primary-light); }

/* ===== About ===== */
.section-about { background: var(--white); }
.about-layout { display: grid; grid-template-columns: 1.2fr 1fr; gap: 48px; align-items: start; }
.about-text p { font-size: 16px; color: var(--gray-700); line-height: 2; margin-bottom: 16px; }
.about-cards { display: flex; flex-direction: column; gap: 16px; }
.about-card {
  background: var(--white); border: 1px solid var(--gray-300);
  border-radius: var(--radius-lg); padding: 28px;
  border-left: 4px solid var(--primary); transition: var(--transition);
  position: relative; overflow: hidden;
}
.about-card:hover { box-shadow: var(--shadow-md); transform: translateX(4px); }
.about-card-num {
  position: absolute; right: 20px; top: 16px;
  font-size: 40px; font-weight: 800; color: var(--gray-300);
}
.about-card h4 { font-size: 16px; font-weight: 700; color: var(--dark-2); margin-bottom: 6px; }
.about-card p { font-size: 14px; color: var(--gray-500); }

/* ===== Contact ===== */
.section-contact { background: var(--gray-100); }
.contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-info { display: flex; flex-direction: column; gap: 28px; }
.contact-item { display: flex; align-items: center; gap: 16px; }
.contact-icon { width: 48px; height: 48px; border-radius: 12px; background: var(--primary-light); flex-shrink: 0; display: flex; align-items: center; justify-content: center; position: relative; }
.ci-1::after, .ci-2::after, .ci-3::after, .ci-4::after { content: ''; width: 20px; height: 20px; border: 2px solid var(--primary); border-radius: 4px; }
.contact-item h4 { font-size: 14px; color: var(--gray-500); margin-bottom: 2px; }
.contact-item p { font-size: 18px; font-weight: 600; color: var(--dark-2); }
.contact-form-wrap { background: var(--white); border-radius: var(--radius-lg); padding: 36px; border: 1px solid var(--gray-300); box-shadow: var(--shadow-sm); }
.contact-form-wrap h3 { font-size: 20px; font-weight: 700; color: var(--dark-2); margin-bottom: 20px; }
.contact-form { display: flex; flex-direction: column; gap: 16px; }
.cf-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.contact-form input, .contact-form select, .contact-form textarea {
  padding: 12px 16px; border: 1px solid var(--gray-300); border-radius: var(--radius);
  font-size: 14px; color: var(--gray-900); background: var(--white); transition: var(--transition); font-family: inherit;
}
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(56,96,244,0.1);
}
.contact-form textarea { resize: vertical; }
.btn-submit {
  width: 100%; height: 48px; border-radius: var(--radius); font-size: 15px; font-weight: 500;
  background: var(--primary); color: var(--white); transition: var(--transition);
}
.btn-submit:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: var(--shadow-md); }

/* ===== Footer ===== */
.footer { background: var(--dark); color: rgba(255,255,255,0.7); padding: 60px 0 0; }
.footer-top { display: grid; grid-template-columns: 1fr 2fr; gap: 48px; padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,0.1); }
.footer-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.footer-logo-img { width: 36px; height: 36px; border-radius: 8px; }
.footer-logo span {
  font-size: 20px;
  font-weight: 800;
  background: linear-gradient(135deg, #7aa8ff 0%, #5b8def 50%, #3860f4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 1px;
}
.footer-company { font-size: 14px; color: rgba(255,255,255,0.6); margin-bottom: 4px; }
.footer-license { font-size: 13px; color: rgba(255,255,255,0.4); }
.footer-cols { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; }
.footer-col h5 { font-size: 15px; font-weight: 600; color: var(--white); margin-bottom: 16px; }
.footer-col a { display: block; font-size: 14px; color: rgba(255,255,255,0.6); padding: 4px 0; transition: var(--transition); }
.footer-col a:hover { color: var(--primary); }
.footer-promise { font-size: 14px; color: rgba(255,255,255,0.6); padding: 4px 0; }
.footer-bottom { text-align: center; padding: 20px 0; font-size: 13px; color: rgba(255,255,255,0.4); }

/* ===== Toast ===== */
.toast {
  position: fixed; bottom: 32px; left: 50%; transform: translateX(-50%) translateY(120%);
  background: var(--dark); color: var(--white); padding: 12px 24px;
  border-radius: var(--radius); font-size: 14px; z-index: 9999;
  transition: transform 0.3s ease; box-shadow: var(--shadow-lg);
}
.toast.show { transform: translateX(-50%) translateY(0); }

/* ===== 微信二维码弹窗 ===== */
.wechat-modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: 10000; display: none; align-items: center; justify-content: center; }
.wechat-modal.show { display: flex; }
.wechat-modal-mask { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); }
.wechat-modal-box { position: relative; background: #fff; border-radius: 16px; padding: 32px 40px; text-align: center; box-shadow: 0 20px 60px rgba(0,0,0,0.15); max-width: 320px; width: 90%; animation: wechatFadeIn 0.25s ease; }
@keyframes wechatFadeIn { from { opacity: 0; transform: translateY(-20px); } to { opacity: 1; transform: translateY(0); } }
.wechat-close { position: absolute; top: 12px; right: 16px; background: none; border: none; font-size: 28px; color: #999; cursor: pointer; line-height: 1; padding: 0; }
.wechat-close:hover { color: #333; }
.wechat-modal-box h3 { font-size: 18px; font-weight: 600; color: #1a1a1a; margin-bottom: 20px; }
.wechat-qr { width: 200px; height: 200px; margin: 0 auto 16px; padding: 10px; background: #fff; border: 1px solid #eee; border-radius: 8px; }
.wechat-qr img { width: 100%; height: 100%; object-fit: contain; display: block; }
.wechat-id { font-size: 14px; color: #666; margin-bottom: 6px; }
.wechat-id strong { color: #3860f4; font-size: 16px; }
.wechat-tip { font-size: 12px; color: #999; }
.wechat-trigger { cursor: pointer; transition: color 0.2s; }
.wechat-trigger:hover { color: var(--primary); }

/* ===== Responsive ===== */
@media (max-width: 968px) {
  .header-nav { display: none; }
  .banner-title { font-size: 32px; }
  .banner-content { flex-direction: column; text-align: center; padding: 0 24px; }
  .banner-stats { gap: 24px; }
  .promo-grid { grid-template-columns: repeat(2, 1fr); }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .solution-layout, .about-layout, .contact-layout { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .header-right .btn-nav-outline { display: none; }
  .banner-title { font-size: 26px; }
  .banner-desc { font-size: 15px; }
  .banner-actions { flex-direction: column; align-items: center; }
  .banner-stats { gap: 16px; }
  .bs-num { font-size: 22px; }
  .section-title { font-size: 24px; }
  .promo-grid, .why-grid, .product-grid { grid-template-columns: 1fr; }
  .cf-row { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: 1fr; }
  .dropdown-grid { grid-template-columns: 1fr; }
}