/* ==========================================================================
   前台主样式 main.css
   由 redesign/index.html 与 redesign/products.html 内联样式 1:1 抽取合并。
   （两段样式存在共享设计系统的重复定义，后者覆盖前者，值一致，无害。）
   ========================================================================== */

/* ===== 以下来自 redesign/index.html（首页） ===== */
/* =====  Reset & Variables  ===== */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

    :root {
      --blue-600: #1a56db;
      --blue-700: #1e40af;
      --blue-800: #1e3a8a;
      --blue-50:  #eff6ff;
      --blue-100: #dbeafe;
      --teal-600: #0d9488;
      --teal-50:  #f0fdfa;

      --gray-50:  #f8fafc;
      --gray-100: #f1f5f9;
      --gray-200: #e2e8f0;
      --gray-300: #cbd5e1;
      --gray-400: #94a3b8;
      --gray-500: #64748b;
      --gray-600: #475569;
      --gray-700: #334155;
      --gray-800: #1e293b;
      --gray-900: #0f172a;

      --white:    #ffffff;

      --font-sans: "PingFang SC", "Microsoft YaHei", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

      --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
      --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
      --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);

      --radius-sm: 6px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --radius-xl: 16px;

      --max-width: 1280px;
    }

    html { scroll-behavior: smooth; }

    body {
      font-family: var(--font-sans);
      font-size: 16px;
      line-height: 1.7;
      color: var(--gray-700);
      background: var(--white);
      -webkit-font-smoothing: antialiased;
    }

    /* =====  Utility  ===== */
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }

    /* =====  Header  ===== */
    .header {
      position: fixed;
      top: 0; left: 0; right: 0;
      z-index: 100;
      height: 80px;
      display: flex;
      align-items: center;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      transition: border-color 0.3s, background 0.3s;
    }
    .header.scrolled {
      border-bottom-color: var(--gray-200);
      background: rgba(255,255,255,0.97);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }
    .logo {
      display: flex;
      align-items: center;
      text-decoration: none;
      line-height: 0;
    }
    .logo img {
      height: 48px;
      width: auto;
      display: block;
    }
    .nav { display: flex; align-items: center; gap: 36px; }
    .nav a {
      text-decoration: none;
      color: var(--gray-600);
      font-size: 15px;
      font-weight: 500;
      transition: color 0.2s;
    }
    .nav a:hover { color: var(--blue-600); }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 24px;
      font-size: 15px;
      font-weight: 600;
      font-family: var(--font-sans);
      border-radius: var(--radius-sm);
      text-decoration: none;
      cursor: pointer;
      border: none;
      transition: all 0.2s;
      line-height: 1.4;
    }
    .btn-primary {
      background: var(--blue-600);
      color: var(--white);
      box-shadow: 0 1px 2px rgba(26,86,219,0.25);
    }
    .btn-primary:hover {
      background: var(--blue-700);
      box-shadow: 0 4px 12px rgba(26,86,219,0.35);
    }
    .btn-outline {
      background: transparent;
      color: var(--blue-600);
      border: 1.5px solid var(--blue-600);
    }
    .btn-outline:hover {
      background: var(--blue-50);
    }
    .btn-lg { padding: 14px 32px; font-size: 16px; border-radius: var(--radius-md); }

    /* =====  Hero  ===== */
    .hero {
      padding: 180px 0 120px;
      background: linear-gradient(170deg, var(--blue-50) 0%, var(--white) 40%, var(--gray-50) 100%);
      overflow: hidden;
      position: relative;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: -200px; right: -100px;
      width: 700px; height: 700px;
      background: radial-gradient(circle, rgba(26,86,219,0.06) 0%, transparent 70%);
      border-radius: 50%;
    }
    .hero::after {
      content: '';
      position: absolute;
      bottom: -120px; left: -80px;
      width: 500px; height: 500px;
      background: radial-gradient(circle, rgba(13,148,136,0.05) 0%, transparent 70%);
      border-radius: 50%;
    }
    .hero .container {
      position: relative;
      z-index: 1;
      display: flex;
      align-items: center;
      gap: 80px;
    }
    .hero-content { flex: 1; max-width: 600px; }
    .hero-badge {
      display: inline-block;
      padding: 6px 16px;
      background: var(--blue-100);
      color: var(--blue-700);
      font-size: 13px;
      font-weight: 600;
      border-radius: 20px;
      margin-bottom: 24px;
      letter-spacing: 0.3px;
    }
    .hero h1 {
      font-size: 52px;
      font-weight: 800;
      line-height: 1.18;
      color: var(--gray-900);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }
    .hero h1 span { color: var(--blue-600); }
    .hero-desc {
      font-size: 18px;
      color: var(--gray-500);
      line-height: 1.7;
      margin-bottom: 36px;
      max-width: 480px;
    }
    .hero-actions { display: flex; gap: 16px; align-items: center; }
    .hero-visual {
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .hero-card {
      width: 520px;
      height: 380px;
      background: var(--white);
      border-radius: var(--radius-xl);
      box-shadow: var(--shadow-xl);
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
    }
    .hero-card-pattern {
      position: absolute;
      inset: 0;
      background:
        linear-gradient(135deg, transparent 48%, var(--blue-50) 48%, var(--blue-50) 52%, transparent 52%),
        linear-gradient(225deg, transparent 48%, var(--teal-50) 48%, var(--teal-50) 52%, transparent 52%);
      opacity: 0.5;
    }
    .hero-card-content {
      position: relative;
      z-index: 1;
      text-align: center;
      padding: 40px;
    }
    .hero-card-icon {
      width: 80px; height: 80px;
      background: var(--blue-600);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      color: white;
      font-size: 32px;
    }
    .hero-card h3 {
      font-size: 20px;
      color: var(--gray-900);
      margin-bottom: 8px;
    }
    .hero-card p { font-size: 14px; color: var(--gray-400); }

    /* =====  Section Common  ===== */
    .section { padding: 100px 0; }
    .section-alt { background: var(--gray-50); }

    .section-header {
      text-align: center;
      margin-bottom: 64px;
    }
    .section-label {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      color: var(--blue-600);
      margin-bottom: 12px;
    }
    .section-header h2 {
      font-size: 38px;
      font-weight: 800;
      color: var(--gray-900);
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }
    .section-header p {
      font-size: 17px;
      color: var(--gray-500);
      max-width: 560px;
      margin: 0 auto;
    }

    /* =====  Business Cards  ===== */
    .biz-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .biz-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 40px 32px;
      border: 1px solid var(--gray-200);
      transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
    }
    .biz-card:hover {
      border-color: var(--blue-600);
      box-shadow: var(--shadow-lg);
      transform: translateY(-2px);
    }
    .biz-card-icon {
      width: 52px; height: 52px;
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      font-size: 24px;
    }
    .biz-card-icon.blue  { background: var(--blue-50);  color: var(--blue-600); }
    .biz-card-icon.teal  { background: var(--teal-50);  color: var(--teal-600); }
    .biz-card h3 {
      font-size: 19px;
      font-weight: 700;
      color: var(--gray-900);
      margin-bottom: 10px;
    }
    .biz-card p {
      font-size: 15px;
      color: var(--gray-500);
      line-height: 1.7;
    }

    /* =====  Products  ===== */
    .prod-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .prod-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      border: 1px solid var(--gray-200);
      text-align: center;
      transition: box-shadow 0.3s, border-color 0.3s;
    }
    .prod-card:hover {
      border-color: transparent;
      box-shadow: var(--shadow-lg);
    }
    .prod-card-icon {
      width: 56px; height: 56px;
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-size: 26px;
    }
    .prod-card-icon.blue  { background: var(--blue-50);  color: var(--blue-600); }
    .prod-card-icon.teal  { background: var(--teal-50);  color: var(--teal-600); }
    .prod-card h4 {
      font-size: 16px;
      font-weight: 700;
      color: var(--gray-900);
      margin-bottom: 8px;
    }
    .prod-card p {
      font-size: 13px;
      color: var(--gray-400);
      line-height: 1.6;
    }

    /* =====  Tech Advantages  ===== */
    .tech-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-bottom: 64px;
    }
    .stat-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 36px 28px;
      border: 1px solid var(--gray-200);
      text-align: center;
    }
    .stat-number {
      font-size: 42px;
      font-weight: 800;
      color: var(--blue-600);
      line-height: 1.1;
      margin-bottom: 8px;
      letter-spacing: -1px;
    }
    .stat-label {
      font-size: 14px;
      color: var(--gray-500);
      font-weight: 500;
    }

    .tech-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .tech-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 36px 30px;
      border: 1px solid var(--gray-200);
      display: flex;
      gap: 18px;
      transition: border-color 0.3s, box-shadow 0.3s;
    }
    .tech-card:hover {
      border-color: var(--blue-600);
      box-shadow: var(--shadow-md);
    }
    .tech-card-dot {
      width: 10px; height: 10px;
      border-radius: 50%;
      background: var(--blue-600);
      flex-shrink: 0;
      margin-top: 6px;
    }
    .tech-card h4 {
      font-size: 17px;
      font-weight: 700;
      color: var(--gray-900);
      margin-bottom: 6px;
    }
    .tech-card p {
      font-size: 14px;
      color: var(--gray-500);
      line-height: 1.7;
    }

    /* =====  Cases  ===== */
    .case-logos {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      align-items: center;
      gap: 32px 40px;
      margin-bottom: 64px;
      padding: 48px 0;
    }
    .case-logo-img {
      height: 56px;
      width: auto;
      max-width: 160px;
      object-fit: contain;
      filter: grayscale(0.3);
      opacity: 0.75;
      transition: opacity 0.3s, filter 0.3s;
    }
    .case-logo-img:hover {
      opacity: 1;
      filter: grayscale(0);
      animation: logo-shake 0.45s ease;
    }
    @keyframes logo-shake {
      0%, 100% { transform: translateX(0) rotate(0); }
      20% { transform: translateX(-6px) rotate(-2deg); }
      40% { transform: translateX(6px) rotate(2deg); }
      60% { transform: translateX(-4px) rotate(-1deg); }
      80% { transform: translateX(4px) rotate(1deg); }
    }

    @media (max-width: 1024px) {
      .case-logo-img { height: 44px; max-width: 130px; }
    }
    @media (max-width: 768px) {
      .case-logo-img { height: 36px; max-width: 110px; }
      .case-logos { gap: 20px 24px; }
    }

    .testimonial {
      max-width: 720px;
      margin: 0 auto;
      text-align: center;
    }
    .testimonial blockquote {
      font-size: 20px;
      font-style: italic;
      color: var(--gray-600);
      line-height: 1.8;
      margin-bottom: 24px;
      position: relative;
    }
    .testimonial blockquote::before {
      content: '"\201C';
      font-size: 72px;
      color: var(--blue-100);
      position: absolute;
      top: -40px; left: 50%;
      transform: translateX(-50%);
      line-height: 1;
      font-style: normal;
      font-family: Georgia, serif;
    }
    .testimonial-author {
      font-size: 16px;
      font-weight: 700;
      color: var(--gray-900);
    }
    .testimonial-role {
      font-size: 14px;
      color: var(--gray-400);
    }

    /* =====  CTA Section  ===== */
    .cta-section {
      padding: 100px 0;
      background: linear-gradient(160deg, var(--blue-700) 0%, var(--blue-800) 100%);
      text-align: center;
    }
    .cta-section h2 {
      font-size: 38px;
      font-weight: 800;
      color: var(--white);
      margin-bottom: 12px;
    }
    .cta-section p {
      font-size: 18px;
      color: rgba(255,255,255,0.7);
      margin-bottom: 36px;
    }
    .btn-white {
      background: var(--white);
      color: var(--blue-700);
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    }
    .btn-white:hover {
      background: var(--blue-50);
      box-shadow: 0 6px 20px rgba(0,0,0,0.2);
    }

    /* =====  Footer  ===== */
    .footer {
      background: var(--gray-900);
      color: var(--gray-400);
      padding: 72px 0 0;
    }
    .footer-grid {
      /* 列宽 品牌:产品中心:快速导航:联系方式 = 1.6:1:1.2:1.2（快导/联系在 1fr 基础上 +20%）；间距 24px */
      display: grid;
      grid-template-columns: 1.6fr 1fr 1.2fr 1.2fr;
      gap: 24px;
      padding-bottom: 56px;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .footer-brand p {
      margin-top: 16px;
      font-size: 14px;
      line-height: 1.8;
      max-width: 280px;
    }
    .footer h5 {
      font-size: 14px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--gray-300);
      margin-bottom: 18px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a {
      text-decoration: none;
      color: var(--gray-400);
      font-size: 14px;
      transition: color 0.2s;
    }
    .footer-links a:hover { color: var(--white); }
    .footer-bottom {
      padding: 24px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      color: var(--gray-500);
    }

    .footer-logo {
      display: flex;
      align-items: center;
      line-height: 0;
      background: rgba(255,255,255,0.96);
      padding: 8px 14px;
      border-radius: 6px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.2);
    }
    .footer-logo img {
      height: 44px;
      width: auto;
      display: block;
    }

    /* =====  Responsive  ===== */
    @media (max-width: 1440px) {
      .hero h1 { font-size: 44px; }
      .hero-card { width: 440px; height: 340px; }
      .prod-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 1024px) {
      .hero .container { flex-direction: column; gap: 48px; }
      .hero-content { max-width: 100%; text-align: center; }
      .hero-actions { justify-content: center; }
      .hero-desc { max-width: 100%; }
      .hero-card { width: 100%; height: 300px; }
      .biz-grid { grid-template-columns: 1fr; }
      .tech-stats { grid-template-columns: repeat(2, 1fr); }
      .tech-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .nav { display: none; }
    }
    @media (max-width: 768px) {
      .container { padding: 0 20px; }
      .header-inner { padding: 0 20px; }
      .hero { padding: 140px 0 80px; }
      .hero h1 { font-size: 32px; }
      .hero-desc { font-size: 16px; }
      .section { padding: 72px 0; }
      .section-header h2 { font-size: 28px; }
      .prod-grid { grid-template-columns: 1fr; }
      .tech-stats { grid-template-columns: 1fr; }
      .case-logos { gap: 28px 32px; }
      .footer-grid { grid-template-columns: 1fr; }
      .cta-section h2 { font-size: 28px; }
      .hero-actions { flex-direction: column; }
      .hero-actions .btn { width: 100%; }
    }

/* ===== 以下来自 redesign/products.html（产品页，含共享设计系统 + 产品页特有组件） ===== */
/* =====  Shared Design System (same as index.html)  ===== */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

    :root {
      --blue-600: #1a56db;
      --blue-700: #1e40af;
      --blue-800: #1e3a8a;
      --blue-50:  #eff6ff;
      --blue-100: #dbeafe;
      --teal-600: #0d9488;
      --teal-50:  #f0fdfa;

      --gray-50:  #f8fafc;
      --gray-100: #f1f5f9;
      --gray-200: #e2e8f0;
      --gray-300: #cbd5e1;
      --gray-400: #94a3b8;
      --gray-500: #64748b;
      --gray-600: #475569;
      --gray-700: #334155;
      --gray-800: #1e293b;
      --gray-900: #0f172a;
      --white:    #ffffff;

      --font-sans: "PingFang SC", "Microsoft YaHei", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

      --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
      --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
      --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);

      --radius-sm: 6px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --radius-xl: 16px;
      --max-width: 1280px;
    }

    html { scroll-behavior: smooth; }

    body {
      font-family: var(--font-sans);
      font-size: 16px;
      line-height: 1.7;
      color: var(--gray-700);
      background: var(--white);
      -webkit-font-smoothing: antialiased;
    }

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }

    /* =====  Header  ===== */
    .header {
      position: fixed;
      top: 0; left: 0; right: 0;
      z-index: 100;
      height: 80px;
      display: flex;
      align-items: center;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      transition: border-color 0.3s, background 0.3s;
    }
    .header.scrolled {
      border-bottom-color: var(--gray-200);
      background: rgba(255,255,255,0.97);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }
    .logo { display: flex; align-items: center; text-decoration: none; line-height: 0; }
    .logo img { height: 48px; width: auto; display: block; }
    .nav { display: flex; align-items: center; gap: 36px; }
    .nav a {
      text-decoration: none;
      color: var(--gray-600);
      font-size: 15px;
      font-weight: 500;
      transition: color 0.2s;
    }
    .nav a:hover, .nav a.active { color: var(--blue-600); }
    .nav a.active { font-weight: 700; }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 24px;
      font-size: 15px;
      font-weight: 600;
      font-family: var(--font-sans);
      border-radius: var(--radius-sm);
      text-decoration: none;
      cursor: pointer;
      border: none;
      transition: all 0.2s;
      line-height: 1.4;
    }
    .btn-primary {
      background: var(--blue-600);
      color: var(--white);
      box-shadow: 0 1px 2px rgba(26,86,219,0.25);
    }
    .btn-primary:hover {
      background: var(--blue-700);
      box-shadow: 0 4px 12px rgba(26,86,219,0.35);
    }

    /* =====  Page Banner  ===== */
    .page-banner {
      padding: 140px 0 72px;
      background: linear-gradient(170deg, var(--blue-50) 0%, var(--white) 60%, var(--gray-50) 100%);
      text-align: center;
      position: relative;
      overflow: hidden;
    }
    .page-banner::before {
      content: '';
      position: absolute;
      top: -120px; right: -60px;
      width: 400px; height: 400px;
      background: radial-gradient(circle, rgba(26,86,219,0.05) 0%, transparent 70%);
      border-radius: 50%;
    }
    .page-breadcrumb {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-size: 14px;
      color: var(--gray-400);
      margin-bottom: 12px;
    }
    .page-breadcrumb a {
      color: var(--gray-500);
      text-decoration: none;
      transition: color 0.2s;
    }
    .page-breadcrumb a:hover { color: var(--blue-600); }
    .page-breadcrumb .sep { color: var(--gray-300); font-size: 12px; }

    .page-banner h1 {
      font-size: 44px;
      font-weight: 800;
      color: var(--gray-900);
      letter-spacing: -0.8px;
      margin-bottom: 12px;
    }
    .page-banner p {
      font-size: 17px;
      color: var(--gray-500);
      max-width: 520px;
      margin: 0 auto;
    }

    /* =====  Filter Bar  ===== */
    .filter-section {
      padding: 0 0 48px;
      background: var(--white);
      border-bottom: 1px solid var(--gray-100);
    }

    .filter-bar {
      display: flex;
      align-items: center;
      gap: 8px;
      padding: 16px 0;
      flex-wrap: wrap;
    }
    .filter-chip {
      padding: 8px 20px;
      font-size: 14px;
      font-weight: 500;
      font-family: var(--font-sans);
      border-radius: 24px;
      border: 1px solid var(--gray-200);
      background: var(--white);
      color: var(--gray-600);
      cursor: pointer;
      transition: all 0.2s;
      white-space: nowrap;
    }
    .filter-chip:hover {
      border-color: var(--blue-600);
      color: var(--blue-600);
      background: var(--blue-50);
    }
    .filter-chip.active {
      background: var(--blue-600);
      color: var(--white);
      border-color: var(--blue-600);
    }
    .filter-count {
      font-size: 13px;
      color: var(--gray-400);
      margin-left: auto;
    }

    /* =====  Product Grid  ===== */
    .products-section { padding: 0 0 100px; }

    .prod-detail-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .prod-detail-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      border: 1px solid var(--gray-200);
      overflow: hidden;
      transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
    }
    .prod-detail-card:hover {
      border-color: transparent;
      box-shadow: var(--shadow-lg);
      transform: translateY(-4px);
    }
    .prod-detail-image {
      width: 100%;
      height: 200px;
      background: var(--gray-50);
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
    }
    .prod-detail-image .placeholder-icon {
      width: 80px; height: 80px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 36px;
    }
    .prod-detail-image .placeholder-icon.blue { background: var(--blue-50); color: var(--blue-600); }
    .prod-detail-image .placeholder-icon.teal { background: var(--teal-50); color: var(--teal-600); }

    .prod-detail-body {
      padding: 24px;
    }
    .prod-detail-tag {
      display: inline-block;
      padding: 3px 12px;
      font-size: 12px;
      font-weight: 600;
      border-radius: 12px;
      margin-bottom: 12px;
      letter-spacing: 0.3px;
    }
    .tag-blue { background: var(--blue-50); color: var(--blue-600); }
    .tag-teal { background: var(--teal-50); color: var(--teal-600); }

    .prod-detail-body h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--gray-900);
      margin-bottom: 8px;
    }
    .prod-detail-body p {
      font-size: 14px;
      color: var(--gray-500);
      line-height: 1.7;
      margin-bottom: 16px;
    }
    .prod-detail-features {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 6px;
      padding-top: 12px;
      border-top: 1px solid var(--gray-100);
    }
    .prod-detail-features li {
      font-size: 13px;
      color: var(--gray-600);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .prod-detail-features li::before {
      content: '';
      width: 6px; height: 6px;
      border-radius: 50%;
      background: var(--blue-600);
      flex-shrink: 0;
    }

    /* =====  Solution Section  ===== */
    .solution-section {
      padding: 100px 0;
      background: var(--gray-50);
    }
    .section-header {
      text-align: center;
      margin-bottom: 64px;
    }
    .section-label {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      color: var(--blue-600);
      margin-bottom: 12px;
    }
    .section-header h2 {
      font-size: 38px;
      font-weight: 800;
      color: var(--gray-900);
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }
    .section-header p {
      font-size: 17px;
      color: var(--gray-500);
      max-width: 560px;
      margin: 0 auto;
    }

    .solution-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .solution-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 40px 36px;
      border: 1px solid var(--gray-200);
      display: flex;
      gap: 24px;
      transition: border-color 0.3s, box-shadow 0.3s;
    }
    .solution-card:hover {
      border-color: var(--blue-600);
      box-shadow: var(--shadow-md);
    }
    .solution-num {
      font-size: 40px;
      font-weight: 800;
      color: var(--blue-100);
      line-height: 1;
      flex-shrink: 0;
    }
    .solution-card h4 {
      font-size: 18px;
      font-weight: 700;
      color: var(--gray-900);
      margin-bottom: 8px;
    }
    .solution-card p {
      font-size: 14px;
      color: var(--gray-500);
      line-height: 1.7;
    }

    /* =====  CTA  ===== */
    .cta-section {
      padding: 100px 0;
      background: linear-gradient(160deg, var(--blue-700) 0%, var(--blue-800) 100%);
      text-align: center;
    }
    .cta-section h2 {
      font-size: 38px;
      font-weight: 800;
      color: var(--white);
      margin-bottom: 12px;
    }
    .cta-section p {
      font-size: 18px;
      color: rgba(255,255,255,0.7);
      margin-bottom: 36px;
    }
    .btn-white {
      background: var(--white);
      color: var(--blue-700);
      padding: 14px 32px;
      font-size: 16px;
      border-radius: var(--radius-md);
      font-weight: 600;
      text-decoration: none;
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      font-family: var(--font-sans);
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
      transition: all 0.2s;
    }
    .btn-white:hover {
      background: var(--blue-50);
      box-shadow: 0 6px 20px rgba(0,0,0,0.2);
    }

    /* =====  Footer  ===== */
    .footer {
      background: var(--gray-900);
      color: var(--gray-400);
      padding: 72px 0 0;
    }
    .footer-grid {
      /* 列宽 品牌:产品中心:快速导航:联系方式 = 1.6:1:1.2:1.2（快导/联系在 1fr 基础上 +20%）；间距 24px */
      display: grid;
      grid-template-columns: 1.6fr 1fr 1.2fr 1.2fr;
      gap: 24px;
      padding-bottom: 56px;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .footer-brand p {
      margin-top: 16px;
      font-size: 14px;
      line-height: 1.8;
      max-width: 280px;
    }
    .footer h5 {
      font-size: 14px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--gray-300);
      margin-bottom: 18px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a {
      text-decoration: none;
      color: var(--gray-400);
      font-size: 14px;
      transition: color 0.2s;
    }
    .footer-links a:hover { color: var(--white); }
    .footer-bottom {
      padding: 24px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      color: var(--gray-500);
    }
    .footer-logo {
      display: flex;
      align-items: center;
      line-height: 0;
      background: rgba(255,255,255,0.96);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      box-shadow: 0 2px 8px rgba(0,0,0,0.2);
      margin-bottom: 16px;
      display: inline-flex;
    }
    .footer-logo img { height: 44px; width: auto; display: block; }

    /* =====  Responsive  ===== */
    @media (max-width: 1024px) {
      .prod-detail-grid { grid-template-columns: repeat(2, 1fr); }
      .solution-grid { grid-template-columns: 1fr; }
      .nav { display: none; }
      .page-banner h1 { font-size: 36px; }
    }
    @media (max-width: 768px) {
      .container { padding: 0 20px; }
      .header-inner { padding: 0 20px; }
      .prod-detail-grid { grid-template-columns: 1fr; }
      .page-banner { padding: 120px 0 56px; }
      .page-banner h1 { font-size: 28px; }
      .filter-bar { gap: 6px; }
      .filter-chip { padding: 6px 14px; font-size: 13px; }
      .footer-grid { grid-template-columns: 1fr; }
      .cta-section h2 { font-size: 28px; }
      .section-header h2 { font-size: 28px; }
    }