/* ===========================
   因博软件科技官网 - 主样式
   渐变蓝科技风主题（大气升级版）
   =========================== */

/* ----- CSS 变量 ----- */
:root {
  --primary: #1677ff;
  --primary-dark: #0958d9;
  --primary-light: #4096ff;
  --gradient: linear-gradient(135deg, #1677ff 0%, #0050b3 100%);
  --gradient-hero: linear-gradient(135deg, #001d6e 0%, #003eb2 40%, #1677ff 100%);
  --text-primary: #1a1a2e;
  --text-secondary: #4a5568;
  --text-light: #718096;
  --bg-light: #f8faff;
  --bg-card: #ffffff;
  --border: #e2e8f0;
  --shadow: 0 4px 24px rgba(22,119,255,0.10);
  --shadow-hover: 0 16px 48px rgba(22,119,255,0.22);
  --radius: 16px;
  --radius-lg: 24px;
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

/* ----- Reset ----- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 18px; }
body { overflow-x: hidden; font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; color: var(--text-primary); background: #fff; line-height: 1.75; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; height: auto; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ----- 通用 ----- */
.container { max-width: 1280px; margin: 0 auto; padding: 0 32px; }
.section { padding: 120px 0; }
.section-header { text-align: center; margin-bottom: 72px; }
.section-tag {
  display: inline-block; background: rgba(22,119,255,0.1); color: var(--primary);
  padding: 8px 22px; border-radius: 30px; font-size: 14px; font-weight: 700;
  margin-bottom: 20px; letter-spacing: 2px;
}
.section-title {
  font-size: 2.8rem; font-weight: 800; color: var(--text-primary);
  margin-bottom: 20px; line-height: 1.25; letter-spacing: -0.5px;
}
.section-desc { font-size: 1.15rem; color: var(--text-secondary); max-width: 640px; margin: 0 auto; line-height: 1.8; }
.gradient-text { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

/* ----- 按钮 ----- */
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--gradient); color: #fff;
  padding: 14px 32px; border-radius: 10px;
  font-size: 16px; font-weight: 700;
  transition: var(--transition);
  box-shadow: 0 6px 20px rgba(22,119,255,0.38);
  letter-spacing: 0.5px;
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 12px 32px rgba(22,119,255,0.48); }
.btn-outline {
  display: inline-flex; align-items: center; gap: 8px;
  background: transparent; color: #fff;
  padding: 14px 32px; border-radius: 10px;
  border: 2px solid rgba(255,255,255,0.65);
  font-size: 16px; font-weight: 700;
  transition: var(--transition);
}
.btn-outline:hover { background: rgba(255,255,255,0.18); border-color: #fff; }
.btn-large { padding: 18px 44px; font-size: 18px; border-radius: 12px; }
.btn-block { width: 100%; justify-content: center; padding: 18px; font-size: 17px; }

/* ===========================
   导航栏
   =========================== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.96);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.navbar.scrolled { box-shadow: 0 2px 24px rgba(0,0,0,0.09); }
.nav-container {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  height: 80px; max-width: 1440px; margin: 0 auto; padding: 0 24px;
  position: relative;
}
.nav-logo { display: flex; align-items: center; }
.logo-img { height: 62px; width: auto; display: block; filter: drop-shadow(0 2px 10px rgba(22,119,255,0.2)); }
.footer-logo-img { height: 64px; width: auto; filter: brightness(0) invert(1) drop-shadow(0 2px 8px rgba(255,255,255,0.15)); }
.nav-links { display: flex; align-items: center; justify-content: center; gap: 0; flex-wrap: nowrap; white-space: nowrap; }
.nav-link {
  padding: 6px 8px; border-radius: 8px;
  font-size: 13px; font-weight: 600; color: var(--text-secondary); white-space: nowrap;
  transition: var(--transition); position: relative;
}
.nav-link:hover, .nav-link.active { color: var(--primary); background: rgba(22,119,255,0.08); }
.nav-dropdown { position: relative; }
.dropdown-menu {
  display: none; position: absolute; top: calc(100% + 10px); left: 0;
  background: #fff; border-radius: var(--radius); padding: 10px 0;
  box-shadow: 0 10px 40px rgba(0,0,0,0.13); min-width: 180px;
  border: 1px solid var(--border);
}
.dropdown-menu a { display: block; padding: 12px 24px; font-size: 15px; color: var(--text-secondary); transition: var(--transition); }
.dropdown-menu a:hover { color: var(--primary); background: var(--bg-light); }
.nav-dropdown:hover .dropdown-menu { display: block; }
.arrow { font-size: 11px; }
.nav-cta { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.nav-phone { font-size: 12px; color: var(--primary); font-weight: 700; white-space: nowrap; }
.nav-city-btn {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 12px; font-weight: 600; color: var(--text-secondary);
  padding: 5px 10px; border-radius: 24px;
  border: 1.5px solid var(--border);
  transition: var(--transition); white-space: nowrap;
}
.nav-city-btn:hover { color: var(--primary); border-color: var(--primary); background: rgba(22,119,255,0.06); }
.nav-toggle { display: none; font-size: 1.6rem; color: var(--text-primary); }
/* 导航栏内"免费试用"按钮单独缩小 */
.nav-cta .btn-primary { padding: 8px 16px; font-size: 13px; box-shadow: 0 4px 14px rgba(22,119,255,0.32); }

/* ===========================
   Hero Banner
   =========================== */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center;
  background: var(--gradient-hero);
  overflow: hidden; padding-top: 80px;
}
.hero-bg {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(ellipse 80% 60% at 70% 50%, rgba(64,150,255,0.18) 0%, transparent 70%),
              radial-gradient(ellipse 40% 40% at 20% 80%, rgba(0,80,179,0.32) 0%, transparent 60%);
}
.hero-particles { position: absolute; top: 0; left: 0; right: 0; bottom: 0; overflow: hidden; }
.particle {
  position: absolute; border-radius: 50%;
  background: rgba(255,255,255,0.1);
  animation: float linear infinite;
}
@keyframes float {
  0% { transform: translateY(100vh) scale(0); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { transform: translateY(-100px) scale(1); opacity: 0; }
}
.hero-content {
  position: relative; z-index: 2;
  max-width: 1280px; margin: 0 auto; padding: 0 32px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 80px;
  align-items: center; width: 100%;
}
.hero-badge {
  display: inline-block; background: rgba(255,255,255,0.18);
  color: #fff; padding: 8px 22px; border-radius: 30px;
  font-size: 15px; font-weight: 600; margin-bottom: 28px;
  border: 1px solid rgba(255,255,255,0.3); letter-spacing: 1px;
}
.hero-title {
  font-size: 4rem; font-weight: 900; color: #fff;
  line-height: 1.15; margin-bottom: 28px; letter-spacing: -1px;
}
.hero-title .gradient-text {
  background: linear-gradient(135deg, #7ec8ff, #c4e1ff);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-subtitle {
  font-size: 1.2rem; color: rgba(255,255,255,0.82);
  margin-bottom: 44px; line-height: 1.9;
}
.hero-actions { display: flex; gap: 20px; flex-wrap: wrap; margin-bottom: 60px; }
.hero-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat-item { text-align: center; }
.stat-number { display: block; font-size: 2.4rem; font-weight: 900; color: #fff; line-height: 1.1; }
.stat-number sup { font-size: 1.1rem; }
.stat-label { font-size: 13px; color: rgba(255,255,255,0.65); margin-top: 6px; display: block; letter-spacing: 0.5px; }

/* 设备模拟 */
.hero-visual { display: flex; justify-content: center; align-items: center; position: relative; z-index: 2; }
.device-mockup {
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 20px; padding: 6px;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  box-shadow: 0 30px 80px rgba(0,0,0,0.35);
  width: 360px;
}
.device-screen { background: #fff; border-radius: 16px; overflow: hidden; }
.screen-header { background: var(--primary); padding: 14px 20px; display: flex; align-items: center; gap: 10px; }
.screen-dot { width: 12px; height: 12px; border-radius: 50%; }
.screen-dot.red { background: #ff5f57; }
.screen-dot.yellow { background: #febc2e; }
.screen-dot.green { background: #28c840; }
.screen-title { color: #fff; font-size: 15px; font-weight: 700; margin-left: 8px; }
.screen-body { padding: 24px; }
.screen-row { display: flex; justify-content: space-between; padding: 12px 0; border-bottom: 1px solid #f0f0f0; font-size: 15px; }
.item-name { color: var(--text-primary); }
.item-price { color: var(--primary); font-weight: 700; }
.screen-divider { height: 1px; background: var(--border); margin: 14px 0; }
.screen-total { display: flex; justify-content: space-between; padding: 10px 0; font-weight: 800; font-size: 17px; }
.total-price { color: #f5222d; font-size: 1.4rem; }
.screen-pay-btns { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 18px; }
.pay-btn { padding: 14px; border-radius: 10px; text-align: center; font-size: 15px; font-weight: 700; cursor: pointer; }
.pay-btn.wechat { background: #07c160; color: #fff; }
.pay-btn.alipay { background: #1677ff; color: #fff; }

/* ===========================
   产品中心
   =========================== */
.products-section { background: var(--bg-light); }
.products-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.product-card {
  background: var(--bg-card); border-radius: var(--radius-lg);
  padding: 40px 36px; border: 1px solid var(--border);
  transition: var(--transition); position: relative; overflow: hidden;
}
.product-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: var(--gradient); opacity: 0; transition: var(--transition);
}
.product-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); border-color: rgba(22,119,255,0.2); }
.product-card:hover::before { opacity: 1; }
.product-card.featured { background: var(--gradient); color: #fff; border-color: transparent; }
.product-card.featured h3, .product-card.featured p, .product-card.featured li { color: rgba(255,255,255,0.92); }
.product-card.featured .product-link { color: #fff; border-color: rgba(255,255,255,0.5); }
.product-icon { font-size: 3.2rem; margin-bottom: 20px; line-height: 1; }
.product-card h3 { font-size: 1.35rem; font-weight: 800; margin-bottom: 12px; color: var(--text-primary); }
.product-card p { font-size: 15px; color: var(--text-secondary); margin-bottom: 20px; line-height: 1.8; }
.product-features { margin-bottom: 24px; }
.product-features li { font-size: 14px; color: var(--text-secondary); padding: 6px 0; }
.product-link {
  display: inline-block; font-size: 15px; font-weight: 700; color: var(--primary);
  padding: 6px 0; border-bottom: 2px solid var(--primary);
  transition: var(--transition);
}

/* ===========================
   解决方案
   =========================== */
.solutions-section { background: #fff; }
.solutions-tabs { background: var(--bg-light); border-radius: var(--radius-lg); overflow: hidden; border: 1px solid var(--border); }
.tab-nav { display: flex; background: #fff; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.tab-btn {
  flex: 1; min-width: 130px; padding: 20px 14px;
  font-size: 15px; font-weight: 600; color: var(--text-secondary);
  background: transparent; border: none; cursor: pointer;
  transition: var(--transition); border-bottom: 3px solid transparent;
}
.tab-btn:hover { color: var(--primary); background: var(--bg-light); }
.tab-btn.active { color: var(--primary); font-weight: 800; border-bottom-color: var(--primary); background: rgba(22,119,255,0.05); }
.tab-content { padding: 60px; }
.tab-pane { display: none; }
.tab-pane.active { display: block; }
.solution-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.solution-text h3 { font-size: 1.75rem; font-weight: 800; margin-bottom: 20px; }
.solution-text p { color: var(--text-secondary); line-height: 1.9; margin-bottom: 28px; font-size: 16px; }
.solution-list { margin-bottom: 36px; }
.solution-list li { padding: 10px 0; font-size: 15px; color: var(--text-secondary); border-bottom: 1px dashed var(--border); }
.solution-list li:last-child { border: none; }
.solution-visual { display: flex; justify-content: center; align-items: center; }
.solution-card-stack { position: relative; width: 260px; height: 220px; }
.sol-card {
  position: absolute; background: var(--gradient); color: #fff;
  border-radius: var(--radius); padding: 22px 28px;
  font-size: 16px; font-weight: 700; text-align: center;
  box-shadow: var(--shadow); white-space: nowrap;
}
.sol-card-1 { top: 0; left: 0; z-index: 3; }
.sol-card-2 { top: 55px; left: 65px; z-index: 2; background: linear-gradient(135deg, #0958d9, #003eb2); }
.sol-card-3 { top: 110px; left: 130px; z-index: 1; background: linear-gradient(135deg, #001d6e, #003eb2); }

/* ===========================
   适配硬件
   =========================== */
.hardware-section { background: var(--bg-light); }
.hardware-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin-bottom: 40px; }
.hardware-card {
  background: #fff; border-radius: var(--radius); padding: 40px 28px;
  text-align: center; border: 1px solid var(--border);
  transition: var(--transition);
}
.hardware-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: rgba(22,119,255,0.25); }
.hw-icon { font-size: 3.2rem; margin-bottom: 18px; line-height: 1; }
.hardware-card h4 { font-size: 1.15rem; font-weight: 800; margin-bottom: 10px; }
.hardware-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }
.hardware-note {
  text-align: center; padding: 20px 24px;
  background: rgba(22,119,255,0.05); border-radius: var(--radius);
  border: 1px dashed rgba(22,119,255,0.3);
}
.hardware-note p { font-size: 15px; color: var(--text-secondary); }
.text-link { color: var(--primary); font-weight: 700; }
.text-link:hover { text-decoration: underline; }

/* ===========================
   亮点数据
   =========================== */
.highlight-section { background: var(--gradient); padding: 80px 0; }
.highlight-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 40px; }
.highlight-item { display: flex; align-items: flex-start; gap: 20px; }
.highlight-icon { font-size: 2.8rem; flex-shrink: 0; line-height: 1; }
.highlight-content h3 { font-size: 1.2rem; font-weight: 800; color: #fff; margin-bottom: 8px; }
.highlight-content p { font-size: 14px; color: rgba(255,255,255,0.78); line-height: 1.7; }

/* ===========================
   新闻资讯
   =========================== */
.news-section { background: #fff; }
.news-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.news-card {
  background: var(--bg-light); border-radius: var(--radius); padding: 36px;
  border: 1px solid var(--border); transition: var(--transition);
}
.news-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: rgba(22,119,255,0.2); }
.news-card.news-featured { grid-column: 1 / -1; background: var(--gradient); }
.news-card.news-featured h3, .news-card.news-featured p { color: rgba(255,255,255,0.92); }
.news-card.news-featured .news-meta span { color: rgba(255,255,255,0.7); }
.news-tag {
  display: inline-block; background: rgba(22,119,255,0.1); color: var(--primary);
  padding: 4px 12px; border-radius: 6px; font-size: 13px; font-weight: 700;
  margin-bottom: 14px;
}
.news-card.news-featured .news-tag { background: rgba(255,255,255,0.22); color: #fff; }
.news-card h3 { font-size: 1.15rem; font-weight: 800; margin-bottom: 12px; line-height: 1.55; }
.news-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 20px; }
.news-meta { display: flex; align-items: center; justify-content: space-between; }
.news-meta span { font-size: 13px; color: var(--text-light); }
.news-more { font-size: 14px; color: var(--primary); font-weight: 700; }
.news-more:hover { text-decoration: underline; }

/* ===========================
   关于我们
   =========================== */
.about-section { background: var(--bg-light); }
.about-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.about-text .section-tag { text-align: left; }
.about-text .section-title { text-align: left; font-size: 2.2rem; }
.about-desc { font-size: 16px; color: var(--text-secondary); line-height: 1.9; margin-bottom: 36px; }
.about-values { display: flex; flex-direction: column; gap: 24px; margin-bottom: 40px; }
.value-item { display: flex; align-items: flex-start; gap: 18px; }
.value-icon { font-size: 2rem; flex-shrink: 0; line-height: 1; }
.value-item h4 { font-size: 1.1rem; font-weight: 800; margin-bottom: 6px; }
.value-item p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }
.about-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.about-stat-card {
  background: #fff; border-radius: var(--radius); padding: 36px 24px;
  text-align: center; border: 1px solid var(--border);
  box-shadow: var(--shadow); transition: var(--transition);
}
.about-stat-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.about-stat-num {
  display: block; font-size: 2.2rem; font-weight: 900;
  background: var(--gradient); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
  color: var(--primary);
}
.about-stat-label { font-size: 14px; color: var(--text-secondary); margin-top: 8px; display: block; }

/* ===========================
   联系我们
   =========================== */
.contact-section { background: var(--gradient-hero); }
.contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: start; }
.contact-text h2 { font-size: 2.4rem; font-weight: 900; color: #fff; margin-bottom: 20px; letter-spacing: -0.5px; }
.contact-text p { color: rgba(255,255,255,0.82); line-height: 1.9; margin-bottom: 36px; font-size: 16px; }
.contact-info-list { display: flex; flex-direction: column; gap: 18px; }
.wechat-qr-block { margin-top: 36px; display: flex; flex-direction: column; align-items: flex-start; gap: 12px; }
.wechat-qr-title { font-size: 1rem; font-weight: 700; color: #fff; }
.wechat-qr-wrap { background: #fff; border-radius: 16px; padding: 16px; display: inline-block; box-shadow: 0 8px 32px rgba(0,0,0,0.25); }
.wechat-qr-wrap img, .wechat-qr-wrap canvas { display: block; border-radius: 8px; }
.wechat-qr-tip { font-size: 0.85rem; color: rgba(255,255,255,0.65); margin-top: 4px; }
.contact-info-item { display: flex; align-items: center; gap: 14px; color: rgba(255,255,255,0.88); font-size: 16px; }

/* ===== 关注我们 - 社媒账号板块 ===== */
.social-follow-block {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid rgba(255,255,255,0.15);
}
.sfb-label {
  font-size: 0.95rem; font-weight: 700; color: rgba(255,255,255,0.9);
  margin-bottom: 18px; letter-spacing: 0.3px;
}
.sfb-row {
  display: flex; gap: 16px; flex-wrap: wrap;
}
.sfb-item {
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 14px; padding: 14px 16px;
  min-width: 90px; transition: all 0.25s ease;
}
.sfb-item:hover {
  background: rgba(255,255,255,0.15);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}
.sfb-qr-wrap {
  width: 80px; height: 80px;
  background: #fff; border-radius: 10px;
  padding: 5px; overflow: hidden;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  cursor: pointer; position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.sfb-qr-wrap:hover {
  transform: scale(1.08);
  box-shadow: 0 8px 24px rgba(0,0,0,0.35);
}
.sfb-qr-img {
  width: 100%; height: 100%; object-fit: cover; border-radius: 6px; display: block;
}
/* ── 二维码放大遮罩层 ── */
#qr-lightbox {
  display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.72); backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 9999; align-items: center; justify-content: center;
  cursor: pointer;
}
#qr-lightbox.active { display: flex; }
.qr-lb-box {
  background: #fff; border-radius: 20px;
  padding: 28px 32px 22px; text-align: center;
  box-shadow: 0 32px 80px rgba(0,0,0,0.45);
  cursor: default; pointer-events: auto;
  animation: qrZoomIn 0.22s ease;
}
@keyframes qrZoomIn {
  from { opacity: 0; transform: scale(0.72); }
  to   { opacity: 1; transform: scale(1); }
}
#qr-lb-img {
  width: 240px; height: 240px; object-fit: contain;
  border-radius: 10px; display: block; margin: 0 auto 14px;
}
.qr-lb-title {
  font-size: 1rem; font-weight: 700; color: #1a1a2e; margin-bottom: 4px;
}
.qr-lb-handle {
  font-size: 0.82rem; color: #666; margin-bottom: 12px;
}
.qr-lb-hint {
  font-size: 0.72rem; color: #bbb;
}
@media (max-width: 480px) {
  .sfb-row { gap: 12px; }
  .sfb-qr-wrap { width: 68px; height: 68px; }
  #qr-lb-img { width: 200px; height: 200px; }
  .qr-lb-box { padding: 22px 24px 18px; }
}
.sfb-platform {
  font-size: 0.75rem; font-weight: 700; color: rgba(255,255,255,0.9);
  text-align: center; white-space: nowrap;
}
.sfb-handle {
  font-size: 0.68rem; color: rgba(255,255,255,0.55);
  text-align: center; white-space: nowrap;
}
@media (max-width: 480px) {
  .sfb-row { gap: 12px; }
  .sfb-qr-wrap { width: 68px; height: 68px; }
}
.contact-form-wrap { background: #fff; border-radius: var(--radius-lg); padding: 48px; box-shadow: 0 24px 72px rgba(0,0,0,0.22); }
.contact-form .form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-group { margin-bottom: 22px; }
.form-group label { display: block; font-size: 14px; font-weight: 700; color: var(--text-secondary); margin-bottom: 8px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 14px 16px; border: 1.5px solid var(--border);
  border-radius: 10px; font-size: 15px; font-family: inherit;
  transition: var(--transition); background: var(--bg-light);
  color: var(--text-primary);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--primary); background: #fff;
  box-shadow: 0 0 0 4px rgba(22,119,255,0.1);
}
.form-privacy { font-size: 13px; color: var(--text-light); text-align: center; margin-top: 14px; }

/* ===========================
   页脚
   =========================== */
.footer { background: #001d6e; padding: 72px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 56px; margin-bottom: 56px; }
.footer-brand .footer-logo { display: flex; align-items: center; gap: 10px; font-size: 1.2rem; font-weight: 800; color: #fff; margin-bottom: 20px; }
.footer-slogan { font-size: 14px; color: rgba(255,255,255,0.52); line-height: 1.9; margin-bottom: 24px; }
.footer-social { display: flex; gap: 14px; }
.social-icon {
  display: flex; align-items: center; justify-content: center;
  width: 42px; height: 42px; background: rgba(255,255,255,0.1);
  border-radius: 10px; font-size: 1.2rem; transition: var(--transition);
}
.social-icon:hover { background: var(--primary); }
.footer-links h4 { font-size: 15px; font-weight: 800; color: #fff; margin-bottom: 20px; }
.footer-links ul { display: flex; flex-direction: column; gap: 12px; }
.footer-links a { font-size: 14px; color: rgba(255,255,255,0.52); transition: var(--transition); }
.footer-links a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1); padding: 24px 0;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px;
}
.footer-bottom p { font-size: 13px; color: rgba(255,255,255,0.42); }
.footer-bottom a { color: rgba(255,255,255,0.52); }
.footer-bottom a:hover { color: #fff; }
.icp { text-align: right; }

/* 回到顶部 */
.back-to-top {
  position: fixed; bottom: 36px; right: 36px; z-index: 999;
  width: 52px; height: 52px; background: var(--gradient);
  color: #fff; border-radius: 50%; font-size: 1.4rem; font-weight: 800;
  box-shadow: var(--shadow); display: none;
  align-items: center; justify-content: center;
  transition: var(--transition);
}
.back-to-top.visible { display: flex; }
.back-to-top:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }

/* ===========================
   响应式
   =========================== */

/* ── 平板宽屏 1024px ── */
@media (max-width: 1024px) {
  html { font-size: 17px; }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .highlight-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-container { padding: 0 20px; }
}

/* ── 平板竖屏 / 大手机 768px ── */
@media (max-width: 768px) {
  html { font-size: 16px; }
  .section { padding: 60px 0; }
  .container { padding: 0 18px; }
  .section-title { font-size: 1.9rem; }
  .section-desc { font-size: 1rem; }
  .section-header { margin-bottom: 48px; }

  /* 导航 */
  .nav-links, .nav-cta { display: none; }
  .nav-toggle { display: block; }
  .nav-container { height: 68px; padding: 0 18px; }
  .logo-img { height: 52px; }

  /* 移动端导航展开后下拉菜单：默认隐藏，点击触发 */
  .nav-links .nav-dropdown .dropdown-menu {
    position: static;
    display: none;
    box-shadow: none;
    border: none;
    background: rgba(22,119,255,0.05);
    border-radius: 8px;
    padding: 6px 0;
    margin: 4px 0 4px 12px;
    min-width: unset;
  }
  .nav-links .nav-dropdown .dropdown-menu.open {
    display: block;
  }
  .nav-links .nav-dropdown .dropdown-menu a {
    padding: 8px 16px;
    font-size: 13px;
  }

  /* Hero */
  .hero { padding-top: 80px; min-height: auto; padding-bottom: 48px; }
  .hero-content {
    grid-template-columns: 1fr; text-align: center;
    gap: 32px; padding: 40px 18px 0;
  }
  .hero-visual { display: none; }
  .hero-title { font-size: 2.2rem; }
  .hero-subtitle { font-size: 1rem; margin-bottom: 32px; }
  .hero-actions { justify-content: center; flex-wrap: wrap; gap: 14px; margin-bottom: 40px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .stat-number { font-size: 2rem; }
  .hero-badge { font-size: 13px; }

  /* 产品/解决方案 */
  .products-grid { grid-template-columns: 1fr; }
  .solution-detail { grid-template-columns: 1fr; gap: 28px; }
  .solution-visual { display: none; }
  .tab-nav { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .tab-btn { min-width: 100px; font-size: 13px; padding: 16px 10px; }
  .tab-content { padding: 24px 18px; }

  /* 硬件/亮点 */
  .hardware-grid { grid-template-columns: repeat(2, 1fr); }
  .highlight-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .highlight-item { gap: 14px; }
  .highlight-icon { font-size: 2.2rem; }

  /* 新闻 */
  .news-grid { grid-template-columns: 1fr; }
  .news-card.news-featured { grid-column: 1; }
  .news-card { padding: 24px; }

  /* 关于我们 */
  .about-layout { grid-template-columns: 1fr; gap: 40px; }
  .about-text .section-title { font-size: 1.7rem; }

  /* 联系我们 */
  .contact-layout { grid-template-columns: 1fr; gap: 36px; }
  .contact-form .form-row { grid-template-columns: 1fr; }
  .contact-text h2 { font-size: 1.8rem; }
  .contact-form-wrap { padding: 32px 24px; overflow: hidden; }
  .wechat-qr-block { align-items: center; }
  .social-follow-block { padding-top: 20px; }
  .sfb-row { justify-content: center; gap: 14px; }

  /* 页脚 */
  .footer-logo-img { height: 48px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .icp { text-align: center; }
  .back-to-top { bottom: 20px; right: 16px; width: 44px; height: 44px; font-size: 1.2rem; }
}

/* ── 手机 480px ── */
@media (max-width: 480px) {
  html { font-size: 15px; }
  .container { padding: 0 16px; }
  .section { padding: 48px 0; }
  .section-title { font-size: 1.6rem; }
  .section-header { margin-bottom: 36px; }

  /* Hero */
  .hero-title { font-size: 1.85rem; letter-spacing: -0.5px; }
  .hero-actions { flex-direction: column; align-items: center; }
  .btn-large { padding: 15px 28px; font-size: 16px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .stat-number { font-size: 1.7rem; }

  /* 产品卡片 */
  .product-card { padding: 28px 20px; }

  /* 解决方案 */
  .tab-btn { min-width: 88px; font-size: 12px; padding: 13px 8px; }
  .tab-content { padding: 18px 14px; }

  /* 硬件 */
  .hardware-grid { grid-template-columns: 1fr; }

  /* 亮点 */
  .highlight-grid { grid-template-columns: 1fr; gap: 20px; }

  /* 联系表单 */
  .contact-form-wrap { padding: 24px 16px; border-radius: 16px; overflow: hidden; }
  .wechat-qr-wrap { padding: 12px; }

  /* 社媒二维码 */
  .sfb-row { gap: 10px; justify-content: center; }
  .sfb-qr-wrap { width: 68px; height: 68px; }
  .sfb-item { padding: 10px 12px; min-width: 78px; }

  /* 二维码弹窗 */
  #qr-lb-img { width: 200px; height: 200px; }
  .qr-lb-box { padding: 22px 20px 18px; margin: 0 16px; }

  /* 页脚 */
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer { padding: 48px 0 0; }
  .footer-logo-img { height: 44px; }
  .about-cards { grid-template-columns: 1fr 1fr; }
}

/* ── 极小屏 360px ── */
@media (max-width: 360px) {
  html { font-size: 14px; }
  .hero-title { font-size: 1.65rem; }
  .sfb-row { gap: 8px; }
  .sfb-qr-wrap { width: 60px; height: 60px; }
  .sfb-item { min-width: 70px; padding: 8px 10px; }
  .btn-large { padding: 13px 22px; font-size: 15px; }
}

/* ===================================================
   成功案例板块
=================================================== */
.cases-section { background: #f8fafd; }
.cases-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 28px; margin-bottom: 48px;
}
.case-card {
  background: #fff; border-radius: 16px; overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.07);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex; flex-direction: column;
}
.case-card:hover { transform: translateY(-6px); box-shadow: 0 12px 40px rgba(0,80,180,0.13); }
.case-img-wrap { position: relative; height: 200px; overflow: hidden; }
.case-img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.case-card:hover .case-img { transform: scale(1.05); }
.case-badge {
  position: absolute; top: 14px; left: 14px;
  background: linear-gradient(135deg, #1565c0, #0d47a1);
  color: #fff; font-size: 0.75rem; font-weight: 600;
  padding: 4px 12px; border-radius: 20px; letter-spacing: 0.05em;
}
.case-body { padding: 24px; flex: 1; display: flex; flex-direction: column; gap: 12px; }
.case-title { font-size: 1.05rem; font-weight: 700; color: #1a2740; line-height: 1.4; }
.case-desc { font-size: 0.88rem; color: #4a5568; line-height: 1.7; flex: 1; }
.case-desc strong { color: #1565c0; }
.case-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.ctag { background: #e8f0fe; color: #1565c0; font-size: 0.75rem; padding: 3px 10px; border-radius: 20px; font-weight: 500; }
.case-result { display: flex; gap: 8px; padding-top: 12px; border-top: 1px solid #eef2f7; }
.cr-item { flex: 1; text-align: center; }
.cr-num { display: block; font-size: 1.3rem; font-weight: 800; color: #1565c0; line-height: 1.2; }
.cr-label { display: block; font-size: 0.7rem; color: #718096; margin-top: 2px; line-height: 1.3; }
.cases-cta {
  text-align: center; padding: 36px;
  background: linear-gradient(135deg, #1565c0 0%, #0d47a1 100%);
  border-radius: 16px; color: #fff;
}
.cases-cta p { font-size: 1.15rem; margin-bottom: 20px; opacity: 0.92; }
.cases-cta strong { color: #fff; font-weight: 700; }

/* 响应式案例 & 合作品牌 */
@media (max-width: 1024px) {
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .cases-grid { grid-template-columns: 1fr; }
  .cases-cta { padding: 24px 20px; }
  .cases-cta p { font-size: 1rem; }
}
@media (max-width: 420px) {
}