/* ===== 合肥知得医疗科技 - 中英双语官网样式 ===== */
/* 设计基调：工业简约商务风 / 蓝灰科技配色 / 医疗设备专业感 */

:root {
  --primary: #1a365d;
  --primary-dark: #0f2440;
  --primary-light: #2b6cb0;
  --accent: #3182ce;
  --cta: #dd6b20;
  --cta-hover: #c0561f;
  --bg-light: #f7fafc;
  --bg-white: #ffffff;
  --bg-dark: #1a202c;
  --bg-footer: #0f1923;
  --text: #2d3748;
  --text-light: #4a5568;
  --text-muted: #718096;
  --text-white: #e2e8f0;
  --border: #e2e8f0;
  --border-light: #edf2f7;
  --success: #38a169;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
  --radius: 8px;
  --radius-lg: 12px;
  --max-width: 1280px;
  --header-h: 72px;
  --header-h-mobile: 60px;
  --transition: all 0.3s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: var(--bg-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
}

/* ===== 顶部导航栏 ===== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: var(--transition);
}
.header.scrolled { box-shadow: var(--shadow); }

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}

.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; flex-shrink: 0; }
.logo img { height: 42px; width: auto; }
.logo-text { font-size: 18px; font-weight: 700; color: var(--primary); white-space: nowrap; }
.logo-text small { display: block; font-size: 10px; font-weight: 400; color: var(--text-muted); letter-spacing: 1px; }

.nav { display: flex; align-items: center; gap: 4px; list-style: none; }
.nav a {
  display: block; padding: 8px 16px;
  font-size: 14px; font-weight: 500;
  color: var(--text-light);
  text-decoration: none;
  border-radius: 6px;
  transition: var(--transition);
  white-space: nowrap;
}
.nav a:hover, .nav a.active { color: var(--accent); background: rgba(49,130,206,0.06); }

.nav-actions { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }

/* 语言切换 */
.lang-switch {
  display: flex; border: 1.5px solid var(--border);
  border-radius: 6px; overflow: hidden; font-size: 12px; font-weight: 600;
}
.lang-switch span {
  padding: 5px 10px; cursor: pointer; transition: var(--transition);
  color: var(--text-muted); background: transparent;
}
.lang-switch span.active { background: var(--primary); color: #fff; }

/* CTA按钮 */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 22px; font-size: 14px; font-weight: 600;
  border-radius: 6px; text-decoration: none;
  border: none; cursor: pointer;
  transition: var(--transition); white-space: nowrap;
}
.btn-primary { background: var(--cta); color: #fff; }
.btn-primary:hover { background: var(--cta-hover); transform: translateY(-1px); box-shadow: 0 4px 14px rgba(221,107,32,0.35); }
.btn-outline { background: transparent; border: 2px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-white { background: #fff; color: var(--primary); }
.btn-white:hover { background: var(--bg-light); }
.btn-lg { padding: 14px 32px; font-size: 16px; border-radius: 8px; }

/* 汉堡菜单按钮 */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; background: none; border: none; }
.hamburger span { display: block; width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: var(--transition); }

/* ===== Hero Banner 全屏轮播 ===== */
.hero { margin-top: var(--header-h); position: relative; height: 85vh; min-height: 560px; overflow: hidden; }
.hero-slide { position: absolute; inset: 0; opacity: 0; transition: opacity 0.8s ease; display: flex; align-items: center; }
.hero-slide.active { opacity: 1; }

.hero-bg {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, #1a365d 0%, #2b6cb0 40%, #1a365d 100%);
  z-index: 0;
}
.hero-bg::after {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(circle at 70% 30%, rgba(49,130,206,0.3) 0%, transparent 60%),
              radial-gradient(circle at 30% 70%, rgba(26,54,93,0.4) 0%, transparent 50%);
}
.hero-particles {
  position: absolute; inset: 0; z-index: 1; opacity: 0.15;
  background-image:
    radial-gradient(2px 2px at 20% 40%, #fff, transparent),
    radial-gradient(2px 2px at 40% 20%, #fff, transparent),
    radial-gradient(2px 2px at 60% 80%, #fff, transparent),
    radial-gradient(2px 2px at 80% 50%, #fff, transparent),
    radial-gradient(1px 1px at 10% 70%, #fff, transparent),
    radial-gradient(1px 1px at 50% 60%, #fff, transparent),
    radial-gradient(1px 1px at 70% 10%, #fff, transparent);
  background-size: 200px 200px;
}

.hero-content {
  position: relative; z-index: 2; max-width: var(--max-width);
  margin: 0 auto; padding: 0 24px; width: 100%;
}
.hero-content h1 { font-size: clamp(32px, 5vw, 52px); font-weight: 800; color: #fff; line-height: 1.2; margin-bottom: 16px; }
.hero-content p { font-size: clamp(16px, 2.5vw, 20px); color: rgba(255,255,255,0.85); max-width: 600px; margin-bottom: 32px; line-height: 1.6; }
.hero-content .btn { font-size: 15px; }

.hero-dots {
  position: absolute; bottom: 32px; left: 50%; transform: translateX(-50%);
  z-index: 3; display: flex; gap: 10px;
}
.hero-dots span {
  width: 10px; height: 10px; border-radius: 50%;
  background: rgba(255,255,255,0.4); cursor: pointer; transition: var(--transition);
}
.hero-dots span.active { background: #fff; width: 28px; border-radius: 5px; }

/* ===== 通用区块 ===== */
.section { padding: 80px 0; }
.section-dark { background: var(--bg-dark); color: var(--text-white); }
.section-gray { background: var(--bg-light); }

.section-header { text-align: center; margin-bottom: 52px; }
.section-header h2 { font-size: clamp(26px, 4vw, 36px); font-weight: 800; color: var(--primary-dark); margin-bottom: 12px; }
.section-dark .section-header h2, .section-dark .section-header p { color: #fff; }
.section-header p { font-size: 17px; color: var(--text-muted); max-width: 640px; margin: 0 auto; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ===== 产品卡片网格 ===== */
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.product-card {
  background: #fff; border-radius: var(--radius-lg);
  overflow: hidden; box-shadow: var(--shadow-sm);
  transition: var(--transition); border: 1px solid var(--border-light);
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.product-card-img {
  aspect-ratio: 1.4 / 1; background: var(--bg-light);
  display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
}
.product-card-img img { width: 100%; height: 100%; object-fit: cover; }
.product-card-img .placeholder {
  width: 100%; height: 100%;
  background: linear-gradient(135deg, #e2e8f0 0%, #cbd5e0 100%);
  display: flex; align-items: center; justify-content: center;
  font-size: 48px; color: var(--text-muted);
}
.product-card-body { padding: 20px; }
.product-card-body h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; color: var(--primary-dark); }
.product-card-body p { font-size: 13px; color: var(--text-muted); line-height: 1.5; margin-bottom: 14px; }
.product-card-body .btn { font-size: 13px; padding: 8px 18px; }

/* ===== 应用领域卡片 ===== */
.app-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
.app-card {
  background: #fff; border-radius: var(--radius-lg);
  padding: 28px 18px; text-align: center;
  box-shadow: var(--shadow-sm); border: 1px solid var(--border-light);
  transition: var(--transition);
}
.app-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.app-icon { font-size: 42px; margin-bottom: 14px; }
.app-card h3 { font-size: 15px; font-weight: 700; margin-bottom: 6px; color: var(--primary-dark); }
.app-card p { font-size: 12px; color: var(--text-muted); line-height: 1.5; }

/* ===== 优势列表 ===== */
.advantage-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.advantage-item { text-align: center; padding: 10px; }
.advantage-icon { font-size: 44px; margin-bottom: 14px; }
.advantage-item h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; color: #fff; }
.advantage-item p { font-size: 13px; color: var(--text-white); opacity: 0.75; }

/* ===== 新闻卡片 ===== */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.news-card {
  background: #fff; border-radius: var(--radius-lg);
  overflow: hidden; box-shadow: var(--shadow-sm);
  transition: var(--transition); border: 1px solid var(--border-light);
}
.news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.news-card-img {
  height: 180px; background: var(--bg-light);
  display: flex; align-items: center; justify-content: center;
  font-size: 36px; color: var(--text-muted);
}
.news-card-body { padding: 18px; }
.news-card-body .date { font-size: 12px; color: var(--text-muted); margin-bottom: 6px; }
.news-card-body h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; color: var(--primary-dark); }
.news-card-body p { font-size: 13px; color: var(--text-muted); line-height: 1.5; }

/* ===== CTA 询盘转化区 ===== */
.cta-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  padding: 64px 0; text-align: center; color: #fff;
}
.cta-section h2 { font-size: clamp(24px, 4vw, 34px); font-weight: 800; margin-bottom: 12px; }
.cta-section p { font-size: 17px; opacity: 0.85; margin-bottom: 28px; }

/* ===== 页脚 ===== */
.footer { background: var(--bg-footer); color: var(--text-white); padding: 60px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
.footer h4 { font-size: 14px; font-weight: 700; margin-bottom: 16px; color: #fff; text-transform: uppercase; letter-spacing: 1px; }
.footer p, .footer a { font-size: 13px; color: rgba(255,255,255,0.6); line-height: 2; text-decoration: none; }
.footer a:hover { color: var(--accent); }
.footer-about p { margin-bottom: 12px; line-height: 1.8; }
.footer-bottom {
  margin-top: 40px; padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.1);
  text-align: center; font-size: 12px; color: rgba(255,255,255,0.4);
}

/* ===== 内页通用Banner ===== */
.page-banner {
  margin-top: var(--header-h); padding: 80px 0 60px;
  background: linear-gradient(135deg, #1a365d 0%, #2b6cb0 100%);
  color: #fff; text-align: center;
}
.page-banner h1 { font-size: clamp(28px, 4.5vw, 42px); font-weight: 800; margin-bottom: 10px; }
.page-banner p { font-size: 17px; opacity: 0.8; }
.breadcrumb { font-size: 13px; opacity: 0.7; margin-bottom: 10px; }
.breadcrumb a { color: rgba(255,255,255,0.8); text-decoration: none; }
.breadcrumb a:hover { color: #fff; }

/* ===== 产品列表页 ===== */
.products-layout { display: grid; grid-template-columns: 240px 1fr; gap: 32px; align-items: start; }
.sidebar {
  background: #fff; border-radius: var(--radius-lg);
  padding: 20px; box-shadow: var(--shadow-sm);
  position: sticky; top: calc(var(--header-h) + 20px);
}
.sidebar h3 { font-size: 16px; font-weight: 700; margin-bottom: 14px; color: var(--primary-dark); }
.sidebar-nav { list-style: none; }
.sidebar-nav li { margin-bottom: 4px; }
.sidebar-nav a {
  display: block; padding: 10px 14px; font-size: 14px;
  color: var(--text-light); text-decoration: none;
  border-radius: 6px; transition: var(--transition);
}
.sidebar-nav a:hover, .sidebar-nav a.active { background: rgba(49,130,206,0.08); color: var(--accent); font-weight: 600; }

.product-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }

/* ===== 产品详情页 ===== */
.product-detail { padding: 0 0 60px; margin-top: var(--header-h); }
.detail-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; margin-bottom: 52px; }
.detail-gallery {
  background: var(--bg-light); border-radius: var(--radius-lg);
  height: 420px; display: flex; align-items: center; justify-content: center;
  font-size: 64px; color: var(--text-muted); overflow: hidden;
}
.detail-gallery img { width: 100%; height: 100%; object-fit: contain; }
.detail-info h1 { font-size: 30px; font-weight: 800; margin-bottom: 14px; color: var(--primary-dark); }
.detail-info .subtitle { font-size: 16px; color: var(--text-muted); margin-bottom: 20px; }
.detail-features { list-style: none; margin-bottom: 24px; }
.detail-features li { padding: 6px 0; font-size: 14px; display: flex; align-items: center; gap: 8px; }
.detail-features li::before { content: '✓'; color: var(--success); font-weight: 700; font-size: 16px; }

.specs-table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14px; }
.specs-table th, .specs-table td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--border); }
.specs-table th { background: var(--bg-light); font-weight: 700; color: var(--primary-dark); width: 200px; }

/* ===== 应用领域页 ===== */
.app-detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.app-detail-card {
  background: #fff; border-radius: var(--radius-lg);
  overflow: hidden; box-shadow: var(--shadow-sm);
  display: flex; flex-direction: column;
}
.app-detail-img {
  height: 220px; background: var(--bg-light);
  display: flex; align-items: center; justify-content: center;
  font-size: 48px; color: var(--text-muted);
}
.app-detail-body { padding: 22px; flex: 1; }
.app-detail-body h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; color: var(--primary-dark); }
.app-detail-body p { font-size: 14px; color: var(--text-muted); line-height: 1.7; margin-bottom: 10px; }

/* ===== 关于我们 ===== */
.about-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.about-img {
  background: var(--bg-light); border-radius: var(--radius-lg);
  height: 380px; display: flex; align-items: center; justify-content: center;
  font-size: 56px; color: var(--text-muted);
}
.about-text h2 { font-size: 28px; font-weight: 800; margin-bottom: 16px; color: var(--primary-dark); }
.about-text p { font-size: 15px; line-height: 1.8; color: var(--text-light); margin-bottom: 14px; }

.capability-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.capability-card {
  background: #fff; border-radius: var(--radius-lg);
  padding: 28px 18px; text-align: center;
  box-shadow: var(--shadow-sm);
}
.capability-card .icon { font-size: 40px; margin-bottom: 12px; }
.capability-card h3 { font-size: 16px; font-weight: 700; color: var(--primary-dark); margin-bottom: 6px; }
.capability-card p { font-size: 13px; color: var(--text-muted); }

/* ===== 联系页面 ===== */
.contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-info h2 { font-size: 26px; font-weight: 800; margin-bottom: 20px; color: var(--primary-dark); }
.contact-item { display: flex; gap: 12px; margin-bottom: 18px; align-items: flex-start; }
.contact-item .icon { font-size: 22px; flex-shrink: 0; width: 28px; text-align: center; }
.contact-item .info { font-size: 14px; color: var(--text-light); line-height: 1.7; }

.contact-form { background: #fff; border-radius: var(--radius-lg); padding: 32px; box-shadow: var(--shadow); }
.contact-form h3 { font-size: 20px; font-weight: 700; margin-bottom: 20px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; color: var(--text-light); margin-bottom: 5px; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 12px 14px; border: 1.5px solid var(--border);
  border-radius: 6px; font-size: 16px; font-family: inherit;
  transition: var(--transition); background: var(--bg-light);
  -webkit-appearance: none;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  border-color: var(--accent); outline: none; background: #fff;
}
.form-group textarea { resize: vertical; min-height: 120px; }

/* ===== 新闻列表页 ===== */
.news-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

/* ===== 弹窗 ===== */
.modal-mask { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.6); z-index: 2000; }
.modal-mask.show { display: flex; align-items: center; justify-content: center; }
.modal-box { background: #fff; border-radius: var(--radius-lg); padding: 32px; max-width: 500px; width: 90%; position: relative; }
.modal-close { position: absolute; top: 12px; right: 16px; font-size: 22px; cursor: pointer; color: var(--text-muted); background: none; border: none; }

/* ===== Toast ===== */
.toast {
  position: fixed; top: 20px; left: 50%; transform: translateX(-50%);
  background: var(--success); color: #fff; padding: 12px 28px;
  border-radius: 6px; font-size: 14px; font-weight: 600;
  z-index: 3000; opacity: 0; transition: opacity 0.3s;
  pointer-events: none;
}
.toast.show { opacity: 1; }

/* ===== 返回顶部 ===== */
.back-top {
  position: fixed; bottom: 30px; right: 30px;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; font-size: 18px;
  box-shadow: var(--shadow); opacity: 0; visibility: hidden;
  transition: var(--transition); z-index: 500; border: none;
}
.back-top.show { opacity: 1; visibility: visible; }
.back-top:hover { background: var(--primary-light); transform: translateY(-3px); }

/* ===== 响应式 ===== */

/* --- 平板 (≤1024px) --- */
@media (max-width: 1024px) {
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .app-grid { grid-template-columns: repeat(3, 1fr); }
  .advantage-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .products-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; margin-bottom: 20px; }
  .sidebar-nav { display: flex; flex-wrap: wrap; gap: 6px; }
  .sidebar-nav li { margin: 0; }
  .detail-layout { grid-template-columns: 1fr; }
  .about-intro { grid-template-columns: 1fr; }
  .contact-layout { grid-template-columns: 1fr; }
  .news-grid, .news-list { grid-template-columns: repeat(2, 1fr); }
  .capability-grid { grid-template-columns: repeat(2, 1fr); }
  .app-detail-grid { grid-template-columns: 1fr 1fr; }
}

/* --- 手机横屏 / 小平板 (≤768px) --- */
@media (max-width: 768px) {
  :root { --header-h: var(--header-h-mobile); }

  /* 导航 */
  .hamburger { display: flex; }
  .nav {
    position: fixed; top: var(--header-h); left: 0; right: 0;
    background: #fff; flex-direction: column; padding: 8px 20px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-120%); transition: transform 0.35s ease;
    z-index: 999; max-height: 70vh; overflow-y: auto;
  }
  .nav.open { transform: translateY(0); }
  .nav a { padding: 14px 0; font-size: 16px; border-bottom: 1px solid var(--border-light); width: 100%; }
  .nav a:last-child { border-bottom: none; }

  .logo-text { font-size: 15px; }
  .logo-text small { font-size: 9px; }
  .btn-header { display: none; }
  .lang-switch span { padding: 6px 10px; font-size: 13px; }

  /* Hero */
  .hero { height: 60vh; min-height: 360px; }
  .hero-content { padding: 0 20px; text-align: center; }
  .hero-content h1 { font-size: clamp(22px, 6vw, 34px); }
  .hero-content p { font-size: 14px; margin-bottom: 24px; }
  .hero-dots { bottom: 20px; }
  .hero-dots span { width: 8px; height: 8px; }
  .hero-dots span.active { width: 22px; }

  /* 通用 */
  .section { padding: 48px 0; }
  .section-header { margin-bottom: 32px; }
  .section-header h2 { font-size: 24px; }
  .section-header p { font-size: 14px; }
  .container { padding: 0 16px; }

  /* 页面Banner */
  .page-banner { padding: 48px 0 36px; }
  .page-banner h1 { font-size: 26px; }
  .page-banner p { font-size: 14px; }

  /* 产品卡片 */
  .product-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .product-card-body { padding: 14px; }
  .product-card-body h3 { font-size: 15px; }
  .product-list { grid-template-columns: 1fr; gap: 12px; }

  /* 应用卡片 */
  .app-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .app-card { padding: 20px 12px; }
  .app-icon { font-size: 32px; margin-bottom: 10px; }
  .app-card h3 { font-size: 13px; }

  /* 应用详情 */
  .app-detail-grid { grid-template-columns: 1fr; gap: 16px; }
  .app-detail-img { height: 160px; font-size: 36px; }

  /* 优势 */
  .advantage-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .advantage-icon { font-size: 32px; }

  /* 新闻 */
  .news-grid, .news-list { grid-template-columns: 1fr; gap: 16px; }
  .news-card-img { height: 140px; }

  /* 产品详情 */
  .detail-gallery { height: 260px; }
  .detail-info h1 { font-size: 24px; }
  .specs-table th { width: 120px; font-size: 12px; }
  .specs-table td { font-size: 12px; padding: 10px 12px; }

  /* 关于我们 */
  .about-intro { gap: 24px; }
  .about-img { height: 240px; }
  .about-text h2 { font-size: 22px; }
  .about-text p { font-size: 14px; }
  .capability-grid { grid-template-columns: 1fr 1fr; gap: 12px; }

  /* 联系我们 */
  .contact-form { padding: 20px; }
  .contact-layout { gap: 24px; }
  .contact-info h2 { font-size: 22px; }

  /* CTA */
  .cta-section { padding: 40px 0; }
  .cta-section h2 { font-size: 22px; }
  .cta-section p { font-size: 14px; }

  /* 页脚 */
  .footer { padding: 40px 0 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 20px; text-align: center; }
  .footer-bottom { margin-top: 24px; font-size: 11px; }

  /* 返回顶部 */
  .back-top { bottom: 20px; right: 16px; width: 40px; height: 40px; font-size: 16px; }

  /* 卡片通用 */
  .card { padding: 14px; }
  .card-title { font-size: 15px; }

  /* 按钮 */
  .btn-lg { padding: 12px 24px; font-size: 15px; }
  .btn { padding: 10px 18px; font-size: 13px; }

  /* 统计卡片 */
  .stats-grid { gap: 8px; }
  .stat-card { padding: 12px; }
  .stat-card .stat-value { font-size: 22px; }
}

/* --- 手机竖屏 (≤480px) --- */
@media (max-width: 480px) {
  .hero { height: 55vh; min-height: 300px; }
  .hero-content h1 { font-size: clamp(20px, 7vw, 28px); }
  .hero-content p { font-size: 13px; max-width: 100%; }
  .hero-content .btn { font-size: 13px; padding: 10px 22px; }

  .product-grid { grid-template-columns: 1fr; gap: 12px; }
  .app-grid { grid-template-columns: 1fr; gap: 8px; }
  .advantage-grid { grid-template-columns: 1fr; gap: 14px; }
  .capability-grid { grid-template-columns: 1fr; gap: 10px; }

  .page-banner { padding: 40px 0 28px; }
  .page-banner h1 { font-size: 22px; }
  .breadcrumb { font-size: 12px; }

  .section { padding: 36px 0; }
  .section-header h2 { font-size: 22px; }
  .section-header p { font-size: 13px; }
  .container { padding: 0 14px; }

  .contact-form { padding: 16px; border-radius: var(--radius); }
  .btn-block { padding: 14px; font-size: 15px; }
  .detail-gallery { height: 220px; font-size: 48px; }
  .specs-table th { width: 100px; }
  .app-detail-img { height: 140px; }
  .about-img { height: 200px; font-size: 40px; }
  .news-card-img { height: 120px; }

  /* 产品列表页侧边栏 */
  .sidebar { padding: 14px; }
  .sidebar h3 { font-size: 14px; }
  .sidebar-nav a { padding: 8px 12px; font-size: 13px; }

  /* 详情页按钮组 */
  .detail-info .btn { width: 100%; justify-content: center; margin-bottom: 8px; }
}

/* --- 超小屏 (≤360px) --- */
@media (max-width: 360px) {
  .hero { height: 50vh; min-height: 260px; }
  .hero-content h1 { font-size: 18px; }
  .hero-content p { font-size: 12px; }
  .hero-content .btn { font-size: 12px; padding: 8px 18px; }
  .lang-switch span { padding: 5px 8px; font-size: 11px; }
  .logo-text { font-size: 14px; }
}