:root {
      --bg: #f6f9fb;
      --bg-soft: #eef5f8;
      --card: #ffffff;
      --text: #17212b;
      --muted: #5f6f7c;
      --line: #dfe9ef;
      --brand: #2c7a8a;
      --brand-dark: #155d6e;
      --accent: #f0a85d;
      --green: #4b9b76;
      --shadow: 0 18px 48px rgba(31, 82, 105, 0.11);
      --radius-xl: 28px;
      --radius-lg: 20px;
      --radius-md: 14px;
      --container: 1120px;
    }

    * {
      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 12% 8%, rgba(90, 169, 185, 0.18), transparent 32%),
        radial-gradient(circle at 88% 18%, rgba(240, 168, 93, 0.14), transparent 28%),
        linear-gradient(180deg, #fbfdfe 0%, var(--bg) 38%, #f7faf8 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: 20;
      background: rgba(250, 253, 254, 0.88);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(214, 229, 236, 0.86);
    }

    .nav {
      min-height: 74px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      letter-spacing: 0.04em;
      color: var(--brand-dark);
      flex: 0 0 auto;
    }

    .brand-mark {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      border-radius: 14px;
      background: linear-gradient(135deg, #dff4f6, #ffffff);
      border: 1px solid rgba(44, 122, 138, 0.2);
      box-shadow: 0 10px 24px rgba(44, 122, 138, 0.13);
      font-size: 24px;
    }

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

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

    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 22px;
      color: #38515d;
      font-size: 15px;
      white-space: nowrap;
    }

    .nav-links a {
      position: relative;
      transition: color 0.2s ease;
    }

    .nav-links a::after {
      content: "";
      position: absolute;
      left: 0;
      right: 0;
      bottom: -8px;
      height: 2px;
      border-radius: 999px;
      background: var(--brand);
      transform: scaleX(0);
      transform-origin: center;
      transition: transform 0.2s ease;
    }

    .nav-links a:hover {
      color: var(--brand-dark);
    }

    .nav-links a:hover::after {
      transform: scaleX(1);
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 16px;
      border-radius: 999px;
      background: #ffffff;
      border: 1px solid rgba(44, 122, 138, 0.22);
      color: var(--brand-dark);
      box-shadow: 0 8px 24px rgba(44, 122, 138, 0.1);
      font-weight: 700;
    }

    .menu-btn {
      display: none;
      width: 44px;
      height: 44px;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: #fff;
      color: var(--text);
      align-items: center;
      justify-content: center;
      cursor: pointer;
    }

    .menu-btn span {
      width: 18px;
      height: 2px;
      background: currentColor;
      position: relative;
      border-radius: 10px;
    }

    .menu-btn span::before,
    .menu-btn span::after {
      content: "";
      position: absolute;
      left: 0;
      width: 18px;
      height: 2px;
      background: currentColor;
      border-radius: 10px;
    }

    .menu-btn span::before {
      top: -6px;
    }

    .menu-btn span::after {
      top: 6px;
    }

    main {
      position: relative;
    }

    .hero {
      padding: 54px 0 38px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.04fr) minmax(300px, 0.76fr);
      gap: 34px;
      align-items: center;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 12px;
      border: 1px solid rgba(44, 122, 138, 0.18);
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.72);
      color: var(--brand-dark);
      font-size: 14px;
      font-weight: 700;
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--green);
      box-shadow: 0 0 0 5px rgba(75, 155, 118, 0.12);
    }

    h1 {
      margin: 20px 0 16px;
      font-size: clamp(34px, 6vw, 62px);
      line-height: 1.08;
      letter-spacing: -0.04em;
      color: #12202a;
    }

    .hero-lead {
      max-width: 680px;
      margin: 0;
      color: #526775;
      font-size: clamp(16px, 2vw, 19px);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      min-height: 46px;
      padding: 12px 18px;
      border-radius: 999px;
      font-weight: 800;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
      cursor: pointer;
      border: 0;
      font-size: 15px;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--brand), var(--brand-dark));
      color: #ffffff;
      box-shadow: 0 14px 30px rgba(21, 93, 110, 0.22);
    }

    .btn-secondary {
      background: #ffffff;
      color: var(--brand-dark);
      border: 1px solid rgba(44, 122, 138, 0.22);
    }

    .btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 18px 34px rgba(21, 93, 110, 0.18);
    }

    .hero-note {
      margin-top: 18px;
      color: var(--muted);
      font-size: 14px;
    }

    .device-card {
      position: relative;
      border-radius: var(--radius-xl);
      padding: 18px;
      background: linear-gradient(160deg, rgba(255,255,255,0.92), rgba(239,248,250,0.78));
      border: 1px solid rgba(198, 223, 232, 0.9);
      box-shadow: var(--shadow);
      overflow: hidden;
    }

    .device-card::before {
      content: "";
      position: absolute;
      width: 180px;
      height: 180px;
      right: -52px;
      top: -62px;
      background: radial-gradient(circle, rgba(44,122,138,0.18), transparent 68%);
      animation: floatGlow 6s ease-in-out infinite alternate;
    }

    .device-image {
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      background: #edf5f7;
      aspect-ratio: 4 / 3;
      display: grid;
      place-items: center;
      border: 1px solid rgba(222, 236, 240, 0.9);
    }

    .device-image img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      padding: 10px;
    }

    .quick-panel {
      margin-top: 14px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
      position: relative;
    }

    .quick-item {
      padding: 12px;
      border-radius: 16px;
      background: #ffffff;
      border: 1px solid rgba(214, 229, 236, 0.9);
    }

    .quick-item strong {
      display: block;
      color: #16303b;
      font-size: 15px;
      margin-bottom: 2px;
    }

    .quick-item span {
      display: block;
      color: var(--muted);
      font-size: 13px;
      line-height: 1.45;
    }

    section {
      padding: 34px 0;
    }

    .section-head {
      display: flex;
      align-items: end;
      justify-content: space-between;
      gap: 24px;
      margin-bottom: 20px;
    }

    .section-kicker {
      color: var(--brand-dark);
      font-weight: 800;
      font-size: 14px;
      letter-spacing: 0.08em;
      margin-bottom: 8px;
    }

    h2 {
      margin: 0;
      font-size: clamp(25px, 3.8vw, 38px);
      line-height: 1.2;
      letter-spacing: -0.025em;
      color: #14242e;
    }

    .section-desc {
      max-width: 430px;
      margin: 0;
      color: var(--muted);
      font-size: 15px;
    }

    .cloud-panel {
      background: rgba(255, 255, 255, 0.76);
      border: 1px solid rgba(214, 229, 236, 0.86);
      border-radius: var(--radius-xl);
      box-shadow: 0 16px 44px rgba(31, 82, 105, 0.08);
      padding: clamp(18px, 3vw, 28px);
    }

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

    .toc a {
      padding: 10px 14px;
      border-radius: 999px;
      background: #f2f7f9;
      border: 1px solid rgba(214, 229, 236, 0.95);
      color: #365564;
      font-size: 14px;
      transition: background 0.2s ease, transform 0.2s ease;
    }

    .toc a:hover {
      background: #ffffff;
      transform: translateY(-2px);
    }

    .decision-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 16px;
    }

    .decision-card {
      padding: 20px;
      border-radius: var(--radius-lg);
      background: #ffffff;
      border: 1px solid rgba(214, 229, 236, 0.88);
      box-shadow: 0 12px 32px rgba(31, 82, 105, 0.06);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .decision-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 18px 38px rgba(31, 82, 105, 0.1);
    }

    .decision-card .tag {
      display: inline-flex;
      padding: 5px 10px;
      border-radius: 999px;
      background: #e9f5f6;
      color: var(--brand-dark);
      font-weight: 800;
      font-size: 13px;
      margin-bottom: 12px;
    }

    h3 {
      margin: 0 0 8px;
      font-size: 19px;
      line-height: 1.35;
      color: #14242e;
    }

    .decision-card p,
    .service-card p,
    .assurance-card p,
    .faq-answer p {
      margin: 0;
      color: var(--muted);
      font-size: 15px;
    }

    .solution-wrap {
      display: grid;
      grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
      gap: 18px;
      align-items: start;
    }

    .rule-box {
      padding: 22px;
      border-radius: var(--radius-xl);
      background: linear-gradient(145deg, #ffffff, #edf7f8);
      border: 1px solid rgba(203, 225, 232, 0.92);
    }

    .rule-box ul,
    .policy-list,
    .service-list {
      list-style: none;
      padding: 0;
      margin: 14px 0 0;
      display: grid;
      gap: 10px;
    }

    .rule-box li,
    .policy-list li,
    .service-list li {
      position: relative;
      padding-left: 24px;
      color: #485e6a;
      font-size: 15px;
    }

    .rule-box li::before,
    .policy-list li::before,
    .service-list li::before {
      content: "";
      position: absolute;
      left: 0;
      top: 0.75em;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--brand);
      box-shadow: 0 0 0 4px rgba(44, 122, 138, 0.1);
    }

    .steps {
      display: grid;
      gap: 12px;
    }

    .step {
      display: grid;
      grid-template-columns: auto 1fr;
      gap: 14px;
      padding: 16px;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.86);
      border: 1px solid rgba(214, 229, 236, 0.9);
    }

    .step-num {
      width: 34px;
      height: 34px;
      display: grid;
      place-items: center;
      border-radius: 12px;
      background: #e9f5f6;
      color: var(--brand-dark);
      font-weight: 900;
    }

    .step strong {
      display: block;
      margin-bottom: 2px;
      color: #17303b;
    }

    .step span {
      color: var(--muted);
      font-size: 14px;
    }

    .service-grid {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 14px;
    }

    .service-card {
      padding: 18px;
      border-radius: 20px;
      background: rgba(255,255,255,0.88);
      border: 1px solid rgba(214, 229, 236, 0.9);
      min-height: 150px;
    }

    .service-icon {
      width: 42px;
      height: 42px;
      border-radius: 15px;
      display: grid;
      place-items: center;
      background: #eef8f4;
      color: var(--green);
      font-weight: 900;
      margin-bottom: 12px;
    }

    .assurance-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 16px;
    }

    .assurance-card {
      padding: 20px;
      border-radius: 20px;
      background: #ffffff;
      border: 1px solid rgba(214, 229, 236, 0.9);
    }

    .assurance-card strong {
      display: block;
      font-size: 17px;
      color: #16303b;
      margin-bottom: 6px;
    }

    .contact-layout {
      display: grid;
      grid-template-columns: minmax(0, 1fr) minmax(260px, 360px);
      gap: 18px;
      align-items: stretch;
    }

    .info-card {
      padding: 24px;
      border-radius: var(--radius-xl);
      background: #ffffff;
      border: 1px solid rgba(214, 229, 236, 0.92);
      box-shadow: 0 16px 40px rgba(31, 82, 105, 0.08);
    }

    .store-meta {
      display: grid;
      gap: 12px;
      margin: 18px 0 0;
    }

    .meta-row {
      display: grid;
      grid-template-columns: 88px 1fr;
      gap: 12px;
      padding-bottom: 12px;
      border-bottom: 1px dashed #d6e5ec;
    }

    .meta-row:last-child {
      border-bottom: 0;
      padding-bottom: 0;
    }

    .meta-row span {
      color: var(--muted);
    }

    .meta-row strong,
    .meta-row a {
      color: #17212b;
      font-weight: 750;
    }

    .qr-card {
      padding: 20px;
      border-radius: var(--radius-xl);
      background: linear-gradient(160deg, #ffffff, #edf7f8);
      border: 1px solid rgba(203, 225, 232, 0.92);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      gap: 14px;
    }

    .qr-box {
      border-radius: 20px;
      background: #ffffff;
      border: 1px solid rgba(214, 229, 236, 0.9);
      padding: 12px;
      display: grid;
      place-items: center;
    }

    .qr-box img {
      width: min(100%, 220px);
      border-radius: 14px;
    }

    .map-link {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 11px 14px;
      border-radius: 14px;
      background: #ffffff;
      border: 1px solid rgba(44, 122, 138, 0.22);
      color: #0066cc;
      font-weight: 800;
      text-align: center;
    }

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

    .faq-item {
      border: 1px solid rgba(214, 229, 236, 0.9);
      border-radius: 18px;
      background: rgba(255,255,255,0.86);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      padding: 17px 18px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      border: 0;
      background: transparent;
      color: #14242e;
      font: inherit;
      font-weight: 800;
      text-align: left;
      cursor: pointer;
    }

    .faq-question .plus {
      width: 28px;
      height: 28px;
      border-radius: 50%;
      background: #e9f5f6;
      color: var(--brand-dark);
      display: grid;
      place-items: center;
      flex: 0 0 auto;
      transition: transform 0.2s ease;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.25s ease;
    }

    .faq-answer-inner {
      padding: 0 18px 17px;
    }

    .faq-item.active .faq-answer {
      max-height: 220px;
    }

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

    .related-links {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 10px;
      margin-top: 16px;
    }

    .related-links a {
      padding: 12px 14px;
      border-radius: 14px;
      background: #ffffff;
      border: 1px solid rgba(214, 229, 236, 0.9);
      color: #38515d;
      font-size: 14px;
      transition: transform 0.2s ease, color 0.2s ease;
    }

    .related-links a:hover {
      transform: translateY(-2px);
      color: var(--brand-dark);
    }

    .final-cta {
      margin: 18px 0 0;
      padding: 24px;
      border-radius: var(--radius-xl);
      background: linear-gradient(135deg, #e8f5f7, #ffffff 54%, #fff4e8);
      border: 1px solid rgba(203, 225, 232, 0.92);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
    }

    .final-cta p {
      margin: 6px 0 0;
      color: var(--muted);
    }

    .site-footer {
      margin-top: 24px;
      background: #eaf3f5;
      border-top: 1px solid #d7e6ec;
      color: #243946;
    }

    .footer-inner {
      padding: 22px 0;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      font-size: 14px;
    }

    .footer-links {
      display: flex;
      gap: 14px;
      flex-wrap: wrap;
    }

    .footer-links a {
      color: #234f5d;
      font-weight: 700;
    }

    .reveal {
      opacity: 0;
      transform: translateY(16px);
      transition: opacity 0.55s ease, transform 0.55s ease;
    }

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

    @keyframes floatGlow {
      from {
        transform: translate(0, 0) scale(1);
      }
      to {
        transform: translate(-18px, 18px) scale(1.08);
      }
    }

    @media (max-width: 940px) {
      .nav-links {
        position: absolute;
        left: 16px;
        right: 16px;
        top: 74px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 12px;
        border-radius: 20px;
        background: #ffffff;
        border: 1px solid var(--line);
        box-shadow: var(--shadow);
        white-space: normal;
      }

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

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

      .nav-links a::after {
        display: none;
      }

      .nav-cta {
        margin-top: 4px;
      }

      .menu-btn {
        display: inline-flex;
      }

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

      .decision-grid,
      .service-grid,
      .related-links {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

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

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

      .hero {
        padding: 34px 0 26px;
      }

      section {
        padding: 26px 0;
      }

      .hero-actions,
      .final-cta {
        flex-direction: column;
        align-items: stretch;
      }

      .btn {
        width: 100%;
      }

      .decision-grid,
      .service-grid,
      .assurance-grid,
      .related-links,
      .quick-panel {
        grid-template-columns: 1fr;
      }

      .cloud-panel,
      .info-card,
      .qr-card {
        padding: 18px;
        border-radius: 22px;
      }

      .meta-row {
        grid-template-columns: 1fr;
        gap: 4px;
      }

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