:root {
      --blue: #1457d9;
      --blue-deep: #0b327a;
      --blue-soft: #eaf2ff;
      --ink: #17213a;
      --muted: #5e6b82;
      --line: #dbe6f6;
      --paper: #ffffff;
      --warm: #f7faff;
      --aqua: #26b6d4;
      --shadow: 0 18px 46px rgba(20, 87, 217, 0.12);
      --radius: 24px;
      --container: 1180px;
    }

    * {
      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(--ink);
      background:
        radial-gradient(circle at 12% 8%, rgba(38, 182, 212, 0.16), transparent 28%),
        radial-gradient(circle at 86% 18%, rgba(20, 87, 217, 0.15), transparent 30%),
        linear-gradient(180deg, #f7fbff 0%, #ffffff 42%, #f4f8ff 100%);
      line-height: 1.7;
    }

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

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

    .container {
      width: min(var(--container), calc(100% - 36px));
      margin: 0 auto;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(248, 251, 255, 0.86);
      backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(219, 230, 246, 0.8);
    }

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

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      font-weight: 800;
      color: var(--blue-deep);
      letter-spacing: 0.04em;
      white-space: nowrap;
    }

    .brand-mark {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      border-radius: 14px;
      color: #fff;
      background: linear-gradient(135deg, var(--blue), var(--aqua));
      box-shadow: 0 12px 26px rgba(20, 87, 217, 0.25);
      font-size: 22px;
    }

    .brand-text {
      display: flex;
      flex-direction: column;
      line-height: 1.25;
    }

    .brand-text small {
      color: var(--muted);
      font-weight: 600;
      letter-spacing: 0;
      font-size: 12px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 22px;
      font-size: 14px;
      color: #2d3c5c;
    }

    .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(--blue);
      transition: width 0.22s ease;
    }

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

    .nav-action {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 42px;
      padding: 0 18px;
      border-radius: 999px;
      background: var(--blue);
      color: #fff;
      font-weight: 700;
      box-shadow: 0 12px 24px rgba(20, 87, 217, 0.22);
      transition: transform 0.22s ease, box-shadow 0.22s ease;
    }

    .nav-action:hover {
      transform: translateY(-2px);
      box-shadow: 0 16px 30px rgba(20, 87, 217, 0.28);
    }

    .menu-toggle {
      display: none;
      width: 42px;
      height: 42px;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: #fff;
      color: var(--blue-deep);
      font-size: 22px;
      cursor: pointer;
    }

    main {
      overflow: hidden;
    }

    .hero {
      padding: 76px 0 46px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.02fr) minmax(320px, 0.78fr);
      gap: 38px;
      align-items: center;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 13px;
      border: 1px solid rgba(20, 87, 217, 0.16);
      border-radius: 999px;
      color: var(--blue-deep);
      background: rgba(255, 255, 255, 0.78);
      font-size: 13px;
      font-weight: 700;
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 999px;
      background: var(--aqua);
      box-shadow: 0 0 0 5px rgba(38, 182, 212, 0.14);
    }

    h1 {
      margin: 20px 0 18px;
      font-size: clamp(34px, 6vw, 58px);
      line-height: 1.08;
      letter-spacing: -0.04em;
      color: #0d1d45;
    }

    .hero-lead {
      margin: 0;
      max-width: 680px;
      color: #45546d;
      font-size: 17px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 28px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 48px;
      padding: 0 22px;
      border-radius: 16px;
      font-weight: 800;
      border: 1px solid transparent;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    }

    .btn-primary {
      color: #fff;
      background: linear-gradient(135deg, var(--blue), #0f45b4);
      box-shadow: 0 16px 34px rgba(20, 87, 217, 0.25);
    }

    .btn-secondary {
      color: var(--blue-deep);
      background: #fff;
      border-color: rgba(20, 87, 217, 0.18);
    }

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

    .hero-note {
      margin-top: 22px;
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      color: #52617b;
      font-size: 14px;
    }

    .hero-note span {
      padding: 7px 11px;
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.78);
      border: 1px solid rgba(219, 230, 246, 0.8);
    }

    .device-card {
      position: relative;
      border-radius: 32px;
      padding: 18px;
      background:
        linear-gradient(145deg, rgba(255, 255, 255, 0.94), rgba(234, 242, 255, 0.76));
      border: 1px solid rgba(20, 87, 217, 0.13);
      box-shadow: var(--shadow);
      isolation: isolate;
    }

    .device-card::before {
      content: "";
      position: absolute;
      inset: 18px 18px auto auto;
      width: 112px;
      height: 112px;
      border-radius: 38px;
      background: linear-gradient(135deg, rgba(38, 182, 212, 0.24), rgba(20, 87, 217, 0.16));
      z-index: -1;
      animation: floaty 5s ease-in-out infinite;
    }

    .phone-gallery {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
    }

    .phone-img {
      aspect-ratio: 4 / 5;
      border-radius: 22px;
      overflow: hidden;
      background: #eef5ff;
      border: 1px solid rgba(20, 87, 217, 0.1);
    }

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

    .diagnosis-strip {
      margin-top: 14px;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
    }

    .diagnosis-strip div {
      padding: 12px;
      border-radius: 18px;
      background: #fff;
      border: 1px solid var(--line);
    }

    .diagnosis-strip strong {
      display: block;
      color: var(--blue-deep);
      font-size: 15px;
    }

    .diagnosis-strip span {
      display: block;
      color: var(--muted);
      font-size: 12px;
      margin-top: 2px;
    }

    section {
      padding: 44px 0;
    }

    .section-head {
      display: flex;
      align-items: flex-end;
      justify-content: space-between;
      gap: 24px;
      margin-bottom: 24px;
    }

    .section-title {
      margin: 0;
      font-size: clamp(26px, 4vw, 38px);
      line-height: 1.18;
      color: #0d1d45;
      letter-spacing: -0.03em;
    }

    .section-desc {
      margin: 0;
      max-width: 520px;
      color: var(--muted);
      font-size: 15px;
    }

    .toc {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 12px;
    }

    .toc a {
      padding: 16px 14px;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.82);
      border: 1px solid var(--line);
      color: var(--blue-deep);
      font-weight: 800;
      text-align: center;
      box-shadow: 0 10px 22px rgba(20, 87, 217, 0.06);
      transition: transform 0.2s ease, border-color 0.2s ease;
    }

    .toc a:hover {
      transform: translateY(-3px);
      border-color: rgba(20, 87, 217, 0.35);
    }

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

    .reason-card {
      padding: 22px;
      border-radius: 24px;
      background: #fff;
      border: 1px solid var(--line);
      box-shadow: 0 12px 30px rgba(20, 87, 217, 0.07);
      transition: transform 0.22s ease, box-shadow 0.22s ease;
    }

    .reason-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 18px 38px rgba(20, 87, 217, 0.12);
    }

    .reason-card b {
      display: inline-grid;
      place-items: center;
      width: 38px;
      height: 38px;
      border-radius: 14px;
      color: #fff;
      background: linear-gradient(135deg, var(--blue), var(--aqua));
      margin-bottom: 14px;
    }

    .reason-card h3 {
      margin: 0 0 8px;
      font-size: 18px;
      color: #102454;
    }

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

    .solution-wrap {
      display: grid;
      grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
      gap: 22px;
      align-items: stretch;
    }

    .panel {
      border-radius: 28px;
      padding: 26px;
      background: linear-gradient(145deg, #ffffff, #edf5ff);
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
    }

    .panel h3 {
      margin: 0 0 12px;
      font-size: 24px;
      color: #0d1d45;
    }

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

    .step-list {
      margin: 22px 0 0;
      padding: 0;
      list-style: none;
      display: grid;
      gap: 12px;
    }

    .step-list li {
      display: grid;
      grid-template-columns: 34px 1fr;
      gap: 12px;
      align-items: start;
      padding: 14px;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.78);
      border: 1px solid rgba(219, 230, 246, 0.9);
    }

    .step-list em {
      width: 34px;
      height: 34px;
      display: grid;
      place-items: center;
      border-radius: 12px;
      background: var(--blue-soft);
      color: var(--blue);
      font-style: normal;
      font-weight: 900;
    }

    .service-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
    }

    .service-item {
      padding: 18px;
      border-radius: 22px;
      background: #fff;
      border: 1px solid var(--line);
    }

    .service-item h3 {
      margin: 0 0 6px;
      font-size: 17px;
      color: var(--blue-deep);
    }

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

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

    .warranty-card {
      padding: 20px;
      border-radius: 24px;
      background: rgba(255, 255, 255, 0.86);
      border: 1px solid var(--line);
    }

    .warranty-card h3 {
      margin: 0 0 8px;
      font-size: 18px;
      color: #102454;
    }

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

    .contact-grid {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 320px;
      gap: 22px;
      align-items: stretch;
    }

    .contact-card {
      padding: 28px;
      border-radius: 30px;
      background: #fff;
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
    }

    .contact-lines {
      display: grid;
      gap: 14px;
      margin-top: 18px;
    }

    .contact-line {
      padding: 14px 16px;
      border-radius: 18px;
      background: var(--warm);
      border: 1px solid var(--line);
      color: #263656;
    }

    .contact-line strong {
      color: var(--blue-deep);
      margin-right: 8px;
    }

    .map-link {
      color: #0066cc;
      font-weight: 800;
      text-decoration: none;
    }

    .qr-card {
      padding: 22px;
      border-radius: 30px;
      background: linear-gradient(145deg, #0f45b4, #1457d9);
      color: #fff;
      box-shadow: 0 20px 46px rgba(20, 87, 217, 0.24);
    }

    .qr-card h3 {
      margin: 0 0 10px;
      font-size: 22px;
    }

    .qr-card p {
      margin: 0 0 16px;
      color: rgba(255, 255, 255, 0.88);
      font-size: 14px;
    }

    .qr-box {
      padding: 12px;
      border-radius: 22px;
      background: #fff;
    }

    .qr-box img {
      width: 100%;
      border-radius: 14px;
    }

    .faq-list {
      display: grid;
      gap: 14px;
    }

    .faq-item {
      border-radius: 22px;
      background: #fff;
      border: 1px solid var(--line);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      padding: 18px 20px;
      border: 0;
      background: transparent;
      color: #102454;
      font-size: 16px;
      font-weight: 800;
      text-align: left;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      cursor: pointer;
    }

    .faq-question span {
      width: 28px;
      height: 28px;
      flex: 0 0 auto;
      display: grid;
      place-items: center;
      border-radius: 10px;
      background: var(--blue-soft);
      color: var(--blue);
      transition: transform 0.2s ease;
    }

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

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

    .faq-item.active .faq-question span {
      transform: rotate(45deg);
    }

    .links-box {
      padding: 24px;
      border-radius: 28px;
      background: rgba(255, 255, 255, 0.78);
      border: 1px solid var(--line);
    }

    .links-box h2 {
      margin: 0 0 12px;
      font-size: 24px;
      color: #0d1d45;
    }

    .link-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .link-cloud a {
      padding: 9px 12px;
      border-radius: 999px;
      background: #fff;
      border: 1px solid var(--line);
      color: #26446f;
      font-size: 13px;
      transition: transform 0.2s ease, color 0.2s ease;
    }

    .link-cloud a:hover {
      transform: translateY(-2px);
      color: var(--blue);
    }

    .summary {
      padding: 28px;
      border-radius: 30px;
      background:
        linear-gradient(135deg, rgba(20, 87, 217, 0.08), rgba(38, 182, 212, 0.08)),
        #fff;
      border: 1px solid var(--line);
    }

    .summary h2 {
      margin: 0 0 10px;
      font-size: 26px;
      color: #0d1d45;
    }

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

    .site-footer {
      margin-top: 22px;
      background: #0d1d45;
      color: #eaf2ff;
      padding: 30px 0;
    }

    .footer-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }

    .footer-inner a {
      color: #cfe0ff;
    }

    .footer-brand {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 800;
    }

    .footer-brand span {
      width: 38px;
      height: 38px;
      display: grid;
      place-items: center;
      border-radius: 14px;
      background: #fff;
      color: var(--blue);
    }

    .footer-info {
      color: #b8c9eb;
      font-size: 13px;
    }

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

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

    @keyframes floaty {
      0%, 100% { transform: translateY(0) rotate(0deg); }
      50% { transform: translateY(10px) rotate(4deg); }
    }

    @media (max-width: 980px) {
      .menu-toggle {
        display: inline-grid;
        place-items: center;
      }

      .nav-links {
        position: absolute;
        left: 18px;
        right: 18px;
        top: 72px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 14px;
        border-radius: 22px;
        background: #fff;
        border: 1px solid var(--line);
        box-shadow: var(--shadow);
      }

      .nav-links.open {
        display: flex;
      }

      .nav-links a {
        padding: 12px 10px;
      }

      .nav-action {
        width: 100%;
        margin-top: 8px;
      }

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

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

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

      .section-head {
        align-items: flex-start;
        flex-direction: column;
      }
    }

    @media (max-width: 640px) {
      .container {
        width: min(var(--container), calc(100% - 28px));
      }

      .hero {
        padding: 48px 0 30px;
      }

      section {
        padding: 34px 0;
      }

      .phone-gallery,
      .diagnosis-strip,
      .reason-grid,
      .service-list,
      .warranty-grid,
      .toc {
        grid-template-columns: 1fr;
      }

      .footer-inner {
        align-items: flex-start;
        flex-direction: column;
      }

      .contact-card,
      .panel,
      .summary {
        padding: 22px;
      }
    }