:root {
      --bg: #f7f9fb;
      --surface: #ffffff;
      --surface-soft: #eef4f7;
      --text: #1f2933;
      --muted: #65727f;
      --line: #dde6ec;
      --brand: #5e8b8f;
      --brand-dark: #32666b;
      --brand-soft: #e5f1f2;
      --warm: #f2eee8;
      --shadow: 0 18px 45px rgba(41, 63, 72, 0.08);
      --radius-lg: 28px;
      --radius-md: 20px;
      --radius-sm: 14px;
      --container: 1160px;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
      color: var(--text);
      background:
        radial-gradient(circle at 8% 4%, rgba(94, 139, 143, 0.14), transparent 30%),
        radial-gradient(circle at 92% 18%, rgba(226, 213, 194, 0.32), transparent 26%),
        linear-gradient(180deg, #fbfcfd 0%, var(--bg) 46%, #f8fafb 100%);
      line-height: 1.7;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    .container {
      width: min(100% - 32px, var(--container));
      margin: 0 auto;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      backdrop-filter: blur(18px);
      background: rgba(255, 255, 255, 0.86);
      border-bottom: 1px solid rgba(221, 230, 236, 0.78);
    }

    .nav {
      min-height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      flex: 0 0 auto;
      font-weight: 800;
      letter-spacing: 0.03em;
      color: var(--brand-dark);
    }

    .brand-mark {
      width: 42px;
      height: 42px;
      border-radius: 15px;
      display: grid;
      place-items: center;
      color: #ffffff;
      background: linear-gradient(135deg, var(--brand-dark), #82a9a8);
      box-shadow: 0 10px 24px rgba(50, 102, 107, 0.18);
      font-size: 22px;
    }

    .brand-text {
      display: flex;
      flex-direction: column;
      line-height: 1.15;
    }

    .brand-text span {
      font-size: 12px;
      color: var(--muted);
      font-weight: 500;
      letter-spacing: 0;
      margin-top: 3px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 22px;
      color: #3b4854;
      font-size: 15px;
      white-space: nowrap;
    }

    .nav-links a {
      position: relative;
      padding: 8px 0;
    }

    .nav-links a::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: 3px;
      width: 0;
      height: 2px;
      border-radius: 999px;
      background: var(--brand);
      transition: width 0.25s ease;
    }

    .nav-links a:hover::after {
      width: 100%;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      min-height: 44px;
      padding: 11px 18px;
      border-radius: 999px;
      border: 1px solid transparent;
      font-weight: 700;
      font-size: 15px;
      cursor: pointer;
      transition: transform 0.22s ease, box-shadow 0.22s ease, background 0.22s ease, border-color 0.22s ease;
    }

    .btn-primary {
      color: #ffffff;
      background: linear-gradient(135deg, var(--brand-dark), var(--brand));
      box-shadow: 0 14px 26px rgba(50, 102, 107, 0.22);
    }

    .btn-secondary {
      color: var(--brand-dark);
      background: #ffffff;
      border-color: rgba(94, 139, 143, 0.24);
    }

    .btn:hover {
      transform: translateY(-2px);
    }

    .btn-primary:hover {
      box-shadow: 0 18px 34px rgba(50, 102, 107, 0.28);
    }

    .menu-toggle {
      display: none;
      width: 44px;
      height: 44px;
      border-radius: 14px;
      border: 1px solid var(--line);
      background: #ffffff;
      color: var(--text);
      cursor: pointer;
    }

    .menu-toggle span {
      display: block;
      width: 18px;
      height: 2px;
      margin: 5px auto;
      border-radius: 999px;
      background: var(--text);
      transition: transform 0.2s ease, opacity 0.2s ease;
    }

    .mobile-panel {
      display: none;
      border-top: 1px solid var(--line);
      background: rgba(255, 255, 255, 0.96);
    }

    .mobile-panel.open {
      display: block;
    }

    .mobile-panel .container {
      padding: 14px 0 18px;
      display: grid;
      gap: 10px;
    }

    .mobile-panel a {
      padding: 11px 2px;
      color: #33414d;
      border-bottom: 1px solid #eef2f5;
    }

    main {
      display: block;
    }

    section {
      padding: 54px 0;
    }

    .hero {
      padding: 72px 0 56px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
      gap: 34px;
      align-items: center;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      border-radius: 999px;
      color: var(--brand-dark);
      background: rgba(229, 241, 242, 0.9);
      border: 1px solid rgba(94, 139, 143, 0.15);
      font-size: 14px;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 999px;
      background: var(--brand);
      box-shadow: 0 0 0 5px rgba(94, 139, 143, 0.13);
    }

    h1 {
      margin: 0;
      font-size: clamp(34px, 6vw, 60px);
      line-height: 1.12;
      letter-spacing: -0.04em;
      color: #18222b;
    }

    .hero p {
      margin: 18px 0 0;
      max-width: 680px;
      color: var(--muted);
      font-size: clamp(16px, 2vw, 18px);
    }

    .hero-actions {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 28px;
    }

    .hero-note {
      margin-top: 18px;
      color: #53616e;
      font-size: 14px;
    }

    .hero-card {
      position: relative;
      padding: 24px;
      border-radius: 34px;
      background: rgba(255, 255, 255, 0.86);
      border: 1px solid rgba(221, 230, 236, 0.95);
      box-shadow: var(--shadow);
      overflow: hidden;
      animation: floatSoft 6s ease-in-out infinite;
    }

    .hero-card::before {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(94, 139, 143, 0.12), transparent 42%);
      pointer-events: none;
    }

    .device-visual {
      position: relative;
      z-index: 1;
      border-radius: 28px;
      padding: 18px;
      background: linear-gradient(145deg, #fdfefe, #eef4f7);
      border: 1px solid rgba(221, 230, 236, 0.9);
    }

    .visual-image {
      overflow: hidden;
      border-radius: 22px;
      background: #f4f7f8;
      aspect-ratio: 4 / 3;
      display: grid;
      place-items: center;
    }

    .visual-image img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .diagnose-strip {
      margin-top: 16px;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
    }

    .diagnose-item {
      padding: 12px 10px;
      border-radius: 16px;
      background: #ffffff;
      border: 1px solid #e7eef2;
      text-align: center;
    }

    .diagnose-item strong {
      display: block;
      color: var(--brand-dark);
      font-size: 15px;
      line-height: 1.25;
    }

    .diagnose-item span {
      display: block;
      margin-top: 3px;
      color: var(--muted);
      font-size: 12px;
    }

    .section-head {
      display: grid;
      grid-template-columns: minmax(0, 0.9fr) minmax(260px, 0.55fr);
      gap: 26px;
      align-items: end;
      margin-bottom: 24px;
    }

    .section-head h2 {
      margin: 0;
      font-size: clamp(26px, 4vw, 40px);
      line-height: 1.22;
      letter-spacing: -0.03em;
      color: #1b2630;
    }

    .section-head p {
      margin: 0;
      color: var(--muted);
      font-size: 16px;
    }

    .service-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }

    .service-card {
      padding: 22px;
      border-radius: var(--radius-md);
      background: rgba(255, 255, 255, 0.9);
      border: 1px solid rgba(221, 230, 236, 0.92);
      box-shadow: 0 12px 30px rgba(41, 63, 72, 0.05);
      transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 18px 36px rgba(41, 63, 72, 0.09);
      border-color: rgba(94, 139, 143, 0.28);
    }

    .service-icon {
      width: 42px;
      height: 42px;
      border-radius: 15px;
      display: grid;
      place-items: center;
      color: var(--brand-dark);
      background: var(--brand-soft);
      font-weight: 800;
      margin-bottom: 14px;
    }

    .service-card h3 {
      margin: 0 0 8px;
      font-size: 18px;
      color: #22303b;
    }

    .service-card p {
      margin: 0;
      color: var(--muted);
      font-size: 14px;
    }

    .solution-wrap {
      display: grid;
      grid-template-columns: minmax(0, 0.88fr) minmax(320px, 1.12fr);
      gap: 18px;
      align-items: stretch;
    }

    .solution-panel {
      padding: 26px;
      border-radius: var(--radius-lg);
      background: linear-gradient(145deg, #ffffff, #f1f6f7);
      border: 1px solid rgba(221, 230, 236, 0.96);
      box-shadow: var(--shadow);
    }

    .solution-panel h2 {
      margin: 0 0 14px;
      font-size: clamp(24px, 4vw, 36px);
      line-height: 1.25;
    }

    .solution-panel p {
      margin: 0;
      color: var(--muted);
    }

    .check-list {
      margin: 20px 0 0;
      padding: 0;
      list-style: none;
      display: grid;
      gap: 12px;
    }

    .check-list li {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      padding: 13px 14px;
      border-radius: 16px;
      background: rgba(255, 255, 255, 0.78);
      border: 1px solid rgba(221, 230, 236, 0.75);
      color: #31404b;
    }

    .check-list li::before {
      content: "✓";
      flex: 0 0 22px;
      width: 22px;
      height: 22px;
      border-radius: 999px;
      display: grid;
      place-items: center;
      color: #ffffff;
      background: var(--brand);
      font-size: 13px;
      margin-top: 2px;
    }

    .steps {
      display: grid;
      gap: 14px;
    }

    .step {
      display: grid;
      grid-template-columns: 54px minmax(0, 1fr);
      gap: 16px;
      padding: 20px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.92);
      border: 1px solid rgba(221, 230, 236, 0.92);
    }

    .step-num {
      width: 54px;
      height: 54px;
      border-radius: 18px;
      display: grid;
      place-items: center;
      background: var(--warm);
      color: var(--brand-dark);
      font-weight: 800;
    }

    .step h3 {
      margin: 0 0 6px;
      font-size: 18px;
    }

    .step p {
      margin: 0;
      color: var(--muted);
      font-size: 15px;
    }

    .gallery {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 16px;
      align-items: stretch;
    }

    .gallery-main,
    .gallery-side {
      overflow: hidden;
      border-radius: var(--radius-lg);
      background: #ffffff;
      border: 1px solid rgba(221, 230, 236, 0.9);
      box-shadow: 0 14px 34px rgba(41, 63, 72, 0.06);
    }

    .gallery-main img,
    .gallery-side img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .gallery-main {
      aspect-ratio: 16 / 10;
    }

    .gallery-stack {
      display: grid;
      gap: 16px;
    }

    .gallery-side {
      aspect-ratio: 16 / 10;
    }

    .warranty-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }

    .warranty-card {
      padding: 20px;
      border-radius: var(--radius-md);
      background: #ffffff;
      border: 1px solid rgba(221, 230, 236, 0.96);
    }

    .warranty-card h3 {
      margin: 0 0 8px;
      font-size: 18px;
      color: #22303b;
    }

    .warranty-card p {
      margin: 0;
      color: var(--muted);
      font-size: 14px;
    }

    .contact-layout {
      display: grid;
      grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.95fr);
      gap: 18px;
      align-items: stretch;
    }

    .contact-card,
    .qr-card {
      padding: 26px;
      border-radius: var(--radius-lg);
      background: rgba(255, 255, 255, 0.94);
      border: 1px solid rgba(221, 230, 236, 0.96);
      box-shadow: var(--shadow);
    }

    .info-list {
      margin: 18px 0 0;
      padding: 0;
      list-style: none;
      display: grid;
      gap: 12px;
    }

    .info-list li {
      display: grid;
      grid-template-columns: 88px minmax(0, 1fr);
      gap: 12px;
      padding: 14px 0;
      border-bottom: 1px solid #edf2f5;
    }

    .info-list li:last-child {
      border-bottom: 0;
    }

    .info-list strong {
      color: #263642;
    }

    .info-list span,
    .info-list a {
      color: var(--muted);
      word-break: break-word;
    }

    .qr-grid {
      display: grid;
      grid-template-columns: 148px minmax(0, 1fr);
      gap: 18px;
      align-items: center;
      margin-top: 18px;
    }

    .qr-box {
      padding: 10px;
      border-radius: 22px;
      background: #ffffff;
      border: 1px solid var(--line);
    }

    .qr-box img {
      width: 128px;
      height: 128px;
      object-fit: contain;
      border-radius: 14px;
    }

    .map-link {
      display: inline-flex;
      align-items: center;
      margin-top: 14px;
      padding: 10px 14px;
      border-radius: 999px;
      color: #0066cc;
      background: #eef6ff;
      border: 1px solid #d7eaff;
      font-weight: 700;
      font-size: 14px;
    }

    .faq-list {
      display: grid;
      gap: 12px;
    }

    .faq-item {
      border-radius: 20px;
      background: #ffffff;
      border: 1px solid rgba(221, 230, 236, 0.96);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 18px 20px;
      border: 0;
      background: transparent;
      color: #243440;
      text-align: left;
      font-size: 16px;
      font-weight: 800;
      cursor: pointer;
    }

    .faq-question span {
      flex: 1;
    }

    .faq-question::after {
      content: "+";
      flex: 0 0 auto;
      width: 28px;
      height: 28px;
      border-radius: 999px;
      display: grid;
      place-items: center;
      color: var(--brand-dark);
      background: var(--brand-soft);
      font-size: 20px;
      line-height: 1;
    }

    .faq-item.active .faq-question::after {
      content: "−";
    }

    .faq-answer {
      display: none;
      padding: 0 20px 18px;
      color: var(--muted);
      font-size: 15px;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .related {
      padding: 26px;
      border-radius: var(--radius-lg);
      background: linear-gradient(135deg, #ffffff, #f0f6f7);
      border: 1px solid rgba(221, 230, 236, 0.96);
    }

    .related h2 {
      margin: 0 0 14px;
      font-size: clamp(24px, 3vw, 34px);
    }

    .related-links {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 10px 18px;
      margin-top: 14px;
    }

    .related-links a {
      color: #2f5f65;
      padding: 10px 0;
      border-bottom: 1px solid rgba(94, 139, 143, 0.14);
    }

    .site-footer {
      margin-top: 8px;
      background: #ffffff;
      border-top: 1px solid var(--line);
      color: #33414d;
    }

    .footer-inner {
      padding: 28px 0;
      display: grid;
      grid-template-columns: minmax(0, 1fr) auto;
      gap: 18px;
      align-items: center;
    }

    .footer-brand {
      display: flex;
      align-items: center;
      gap: 12px;
      color: var(--brand-dark);
      font-weight: 800;
    }

    .footer-brand .brand-mark {
      width: 36px;
      height: 36px;
      border-radius: 13px;
      font-size: 20px;
      box-shadow: none;
    }

    .footer-copy {
      margin-top: 6px;
      color: #66727d;
      font-size: 13px;
    }

    .footer-links {
      display: flex;
      align-items: center;
      gap: 16px;
      color: #50606c;
      font-size: 14px;
      white-space: nowrap;
    }

    .reveal {
      opacity: 0;
      transform: translateY(18px);
      transition: opacity 0.55s ease, transform 0.55s ease;
    }

    .reveal.show {
      opacity: 1;
      transform: translateY(0);
    }

    @keyframes floatSoft {
      0%, 100% {
        transform: translateY(0);
      }
      50% {
        transform: translateY(-8px);
      }
    }

    @media (max-width: 980px) {
      .nav-links,
      .nav-actions {
        display: none;
      }

      .menu-toggle {
        display: inline-block;
      }

      .hero-grid,
      .solution-wrap,
      .contact-layout,
      .section-head {
        grid-template-columns: 1fr;
      }

      .section-head {
        align-items: start;
      }

      .service-grid,
      .warranty-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .gallery {
        grid-template-columns: 1fr;
      }

      .gallery-stack {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 640px) {
      .container {
        width: min(100% - 24px, var(--container));
      }

      .nav {
        min-height: 64px;
      }

      section {
        padding: 38px 0;
      }

      .hero {
        padding: 44px 0 38px;
      }

      .hero-actions {
        align-items: stretch;
      }

      .btn {
        width: 100%;
      }

      .hero-card,
      .solution-panel,
      .contact-card,
      .qr-card,
      .related {
        border-radius: 22px;
        padding: 20px;
      }

      .diagnose-strip,
      .service-grid,
      .warranty-grid,
      .gallery-stack,
      .related-links {
        grid-template-columns: 1fr;
      }

      .step {
        grid-template-columns: 1fr;
      }

      .qr-grid {
        grid-template-columns: 1fr;
      }

      .info-list li {
        grid-template-columns: 1fr;
        gap: 4px;
      }

      .footer-inner {
        grid-template-columns: 1fr;
        align-items: start;
      }

      .footer-links {
        flex-wrap: wrap;
        white-space: normal;
      }
    }