:root {
      --bg: #f2fbff;
      --bg-soft: #e9f8fb;
      --card: #ffffff;
      --card-tint: #f7fdff;
      --text: #17313a;
      --muted: #5a7178;
      --primary: #00a8c8;
      --primary-dark: #007f9a;
      --accent: #69d8c8;
      --sand: #fff4df;
      --line: rgba(20, 92, 110, 0.14);
      --shadow: 0 18px 46px rgba(22, 109, 130, 0.13);
      --radius: 24px;
      --container: 1120px;
      --pad: 18px;
    }

    * {
      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% 8%, rgba(105, 216, 200, 0.22), transparent 28%),
        radial-gradient(circle at 88% 14%, rgba(0, 168, 200, 0.16), transparent 32%),
        linear-gradient(180deg, #f5fcff 0%, #effaff 42%, #fffaf0 100%);
      line-height: 1.65;
      overflow-x: hidden;
    }

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

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

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

    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(245, 252, 255, 0.88);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--line);
    }

    .nav {
      min-height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      font-weight: 800;
      color: #12333b;
      white-space: nowrap;
    }

    .logo-mark {
      width: 42px;
      height: 42px;
      border-radius: 16px;
      display: grid;
      place-items: center;
      color: #ffffff;
      font-size: 24px;
      font-weight: 900;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      box-shadow: 0 10px 24px rgba(0, 168, 200, 0.26);
    }

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

    .brand-text small {
      margin-top: 4px;
      color: var(--muted);
      font-size: 12px;
      font-weight: 600;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .nav-links a {
      padding: 9px 12px;
      color: #29464e;
      font-size: 14px;
      font-weight: 650;
      border-radius: 999px;
      transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
    }

    .nav-links a:hover {
      background: rgba(0, 168, 200, 0.1);
      color: var(--primary-dark);
      transform: translateY(-1px);
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 16px;
      border-radius: 999px;
      background: #17313a;
      color: #ffffff;
      font-weight: 750;
      font-size: 14px;
      box-shadow: 0 12px 24px rgba(23, 49, 58, 0.16);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .nav-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 16px 30px rgba(23, 49, 58, 0.2);
    }

    .menu-btn {
      display: none;
      width: 42px;
      height: 42px;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: #ffffff;
      color: var(--text);
      cursor: pointer;
      font-size: 20px;
    }

    main {
      position: relative;
    }

    .section {
      padding: 58px 0;
    }

    .hero {
      padding: 58px 0 46px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.05fr) minmax(310px, 0.95fr);
      gap: 34px;
      align-items: center;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.72);
      border: 1px solid var(--line);
      color: var(--primary-dark);
      font-size: 13px;
      font-weight: 750;
      box-shadow: 0 8px 20px rgba(0, 168, 200, 0.08);
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--accent);
      box-shadow: 0 0 0 5px rgba(105, 216, 200, 0.18);
    }

    h1 {
      margin: 18px 0 14px;
      font-size: clamp(32px, 6vw, 58px);
      line-height: 1.08;
      letter-spacing: -1.2px;
      color: #102c34;
    }

    .hero-lead {
      max-width: 660px;
      margin: 0;
      color: #425d65;
      font-size: 17px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 26px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      min-height: 46px;
      padding: 12px 18px;
      border-radius: 15px;
      border: 1px solid transparent;
      font-weight: 780;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
      cursor: pointer;
    }

    .btn-primary {
      color: #ffffff;
      background: linear-gradient(135deg, var(--primary), #48cdbf);
      box-shadow: 0 16px 30px rgba(0, 168, 200, 0.24);
    }

    .btn-secondary {
      color: #15343c;
      background: rgba(255, 255, 255, 0.78);
      border-color: var(--line);
    }

    .btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 16px 30px rgba(22, 109, 130, 0.16);
    }

    .hero-note {
      margin-top: 18px;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      max-width: 680px;
    }

    .note-item {
      padding: 12px;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.66);
      border: 1px solid var(--line);
      color: #36545c;
      font-size: 13px;
      font-weight: 650;
    }

    .visual-card {
      position: relative;
      padding: 18px;
      border-radius: 32px;
      background:
        linear-gradient(145deg, rgba(255, 255, 255, 0.94), rgba(236, 252, 255, 0.86));
      border: 1px solid rgba(255, 255, 255, 0.72);
      box-shadow: var(--shadow);
      overflow: hidden;
      animation: floatIn 0.8s ease both;
    }

    .visual-card::before {
      content: "";
      position: absolute;
      inset: auto -70px -70px auto;
      width: 210px;
      height: 210px;
      border-radius: 50%;
      background: rgba(105, 216, 200, 0.22);
    }

    .phone-stack {
      position: relative;
      display: grid;
      grid-template-columns: 1fr 0.78fr;
      gap: 14px;
      align-items: stretch;
    }

    .phone-frame {
      position: relative;
      overflow: hidden;
      border-radius: 28px;
      background: #e7f9fb;
      border: 1px solid rgba(0, 168, 200, 0.16);
      box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.7);
    }

    .phone-frame.main {
      aspect-ratio: 4 / 5;
    }

    .phone-side {
      display: grid;
      gap: 14px;
    }

    .phone-side .phone-frame {
      aspect-ratio: 1 / 1;
    }

    .phone-frame img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      padding: 8px;
    }

    .price-panel {
      position: relative;
      margin-top: 16px;
      padding: 16px;
      border-radius: 22px;
      background: #ffffff;
      border: 1px solid var(--line);
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 14px;
      align-items: center;
    }

    .price-panel strong {
      display: block;
      color: #102c34;
      font-size: 18px;
    }

    .price-panel span {
      display: block;
      margin-top: 3px;
      color: var(--muted);
      font-size: 13px;
    }

    .sea-badge {
      width: 74px;
      height: 74px;
      border-radius: 22px;
      display: grid;
      place-items: center;
      text-align: center;
      color: #075766;
      font-size: 13px;
      font-weight: 850;
      background: linear-gradient(135deg, #def9fb, #fff4df);
      border: 1px solid rgba(0, 168, 200, 0.15);
    }

    .section-head {
      margin-bottom: 24px;
      display: grid;
      grid-template-columns: minmax(0, 0.78fr) minmax(260px, 0.42fr);
      gap: 24px;
      align-items: end;
    }

    .section-head h2 {
      margin: 8px 0 0;
      color: #12313a;
      font-size: clamp(25px, 4vw, 38px);
      line-height: 1.18;
    }

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

    .soft-panel {
      padding: 28px;
      border-radius: var(--radius);
      background: rgba(255, 255, 255, 0.74);
      border: 1px solid var(--line);
      box-shadow: 0 14px 38px rgba(22, 109, 130, 0.08);
    }

    .toc {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      padding: 14px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.58);
      border: 1px solid var(--line);
    }

    .toc a {
      padding: 9px 12px;
      border-radius: 999px;
      background: #ffffff;
      color: #23606d;
      font-size: 14px;
      font-weight: 700;
      border: 1px solid rgba(0, 168, 200, 0.12);
    }

    .pricing-grid {
      display: grid;
      grid-template-columns: 0.82fr 1.18fr;
      gap: 18px;
      align-items: start;
    }

    .quote-box {
      padding: 26px;
      border-radius: 28px;
      background: linear-gradient(160deg, #ffffff 0%, #e8fbff 100%);
      border: 1px solid rgba(0, 168, 200, 0.18);
      box-shadow: var(--shadow);
    }

    .quote-box h3 {
      margin: 0 0 10px;
      font-size: 22px;
      color: #12313a;
    }

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

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

    .quote-list li {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      color: #36545c;
    }

    .quote-list li::before {
      content: "✓";
      flex: 0 0 22px;
      width: 22px;
      height: 22px;
      border-radius: 50%;
      display: grid;
      place-items: center;
      background: rgba(0, 168, 200, 0.12);
      color: var(--primary-dark);
      font-size: 13px;
      font-weight: 900;
      margin-top: 2px;
    }

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

    .factor-card {
      padding: 20px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.78);
      border: 1px solid var(--line);
      transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
    }

    .factor-card:hover {
      transform: translateY(-4px);
      border-color: rgba(0, 168, 200, 0.28);
      background: #ffffff;
    }

    .factor-card h3 {
      margin: 0 0 8px;
      color: #17313a;
      font-size: 17px;
    }

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

    .service-ribbon {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 12px;
    }

    .service-item {
      min-height: 132px;
      padding: 18px;
      border-radius: 23px;
      background: #ffffff;
      border: 1px solid var(--line);
      box-shadow: 0 10px 30px rgba(22, 109, 130, 0.07);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .service-item:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 36px rgba(22, 109, 130, 0.12);
    }

    .service-icon {
      width: 38px;
      height: 38px;
      border-radius: 14px;
      display: grid;
      place-items: center;
      margin-bottom: 12px;
      background: linear-gradient(135deg, #e3fbff, #fff4df);
      color: var(--primary-dark);
      font-weight: 900;
    }

    .service-item h3 {
      margin: 0 0 6px;
      color: #17313a;
      font-size: 16px;
    }

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

    .solution-layout {
      display: grid;
      grid-template-columns: minmax(0, 1fr) minmax(280px, 0.68fr);
      gap: 18px;
      align-items: start;
    }

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

    .step {
      display: grid;
      grid-template-columns: auto 1fr;
      gap: 14px;
      padding: 18px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.78);
      border: 1px solid var(--line);
    }

    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 13px;
      display: grid;
      place-items: center;
      background: #17313a;
      color: #ffffff;
      font-weight: 850;
    }

    .step h3 {
      margin: 0 0 5px;
      color: #17313a;
      font-size: 17px;
    }

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

    .scenario-card {
      padding: 24px;
      border-radius: 28px;
      background: linear-gradient(160deg, rgba(255, 255, 255, 0.92), rgba(255, 244, 223, 0.86));
      border: 1px solid rgba(210, 159, 69, 0.14);
      box-shadow: 0 14px 38px rgba(160, 111, 31, 0.08);
    }

    .scenario-card h3 {
      margin: 0 0 12px;
      color: #17313a;
      font-size: 21px;
    }

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

    .scenario-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .scenario-tags span {
      padding: 7px 10px;
      border-radius: 999px;
      background: #ffffff;
      border: 1px solid rgba(0, 168, 200, 0.14);
      color: #23606d;
      font-size: 13px;
      font-weight: 700;
    }

    .warranty-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 14px;
    }

    .warranty-card {
      padding: 20px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.82);
      border: 1px solid var(--line);
    }

    .warranty-card h3 {
      margin: 0 0 8px;
      color: #17313a;
      font-size: 17px;
    }

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

    .contact-wrap {
      display: grid;
      grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
      gap: 18px;
      align-items: stretch;
    }

    .contact-card {
      padding: 26px;
      border-radius: 28px;
      background: #ffffff;
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
    }

    .contact-card h2 {
      margin: 0 0 12px;
      font-size: 28px;
      color: #12313a;
    }

    .contact-list {
      display: grid;
      gap: 12px;
      margin-top: 18px;
    }

    .contact-line {
      padding: 14px 15px;
      border-radius: 18px;
      background: var(--card-tint);
      border: 1px solid rgba(0, 168, 200, 0.1);
    }

    .contact-line strong {
      display: block;
      color: #17313a;
      margin-bottom: 2px;
    }

    .contact-line span,
    .contact-line a {
      color: #4e6870;
      font-size: 14px;
    }

    .map-link {
      color: #0066cc;
      font-weight: 750;
      text-decoration: none;
    }

    .qr-area {
      display: grid;
      grid-template-columns: 210px 1fr;
      gap: 18px;
      align-items: center;
      padding: 22px;
      border-radius: 28px;
      background:
        linear-gradient(135deg, rgba(232, 251, 255, 0.9), rgba(255, 244, 223, 0.78));
      border: 1px solid var(--line);
    }

    .qr-box {
      padding: 12px;
      border-radius: 24px;
      background: #ffffff;
      border: 1px solid rgba(0, 168, 200, 0.16);
      box-shadow: 0 14px 30px rgba(22, 109, 130, 0.1);
    }

    .qr-box img {
      width: 100%;
      border-radius: 16px;
    }

    .qr-area h3 {
      margin: 0 0 8px;
      color: #17313a;
      font-size: 22px;
    }

    .qr-area p {
      margin: 0 0 14px;
      color: var(--muted);
    }

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

    .faq-item {
      border-radius: 20px;
      overflow: hidden;
      background: rgba(255, 255, 255, 0.84);
      border: 1px solid var(--line);
    }

    .faq-question {
      width: 100%;
      padding: 18px 20px;
      border: 0;
      background: transparent;
      color: #17313a;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
      text-align: left;
      font-size: 16px;
      font-weight: 800;
      cursor: pointer;
    }

    .faq-question span {
      flex: 1;
    }

    .faq-question i {
      width: 24px;
      height: 24px;
      border-radius: 50%;
      display: grid;
      place-items: center;
      background: rgba(0, 168, 200, 0.11);
      color: var(--primary-dark);
      font-style: normal;
      transition: transform 0.2s ease;
    }

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

    .faq-answer p {
      margin: 0;
      padding: 0 20px 18px;
      color: var(--muted);
    }

    .faq-item.active .faq-answer {
      max-height: 180px;
    }

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

    .links-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
    }

    .links-grid a {
      padding: 12px 14px;
      border-radius: 16px;
      background: rgba(255, 255, 255, 0.78);
      border: 1px solid var(--line);
      color: #31535c;
      font-size: 14px;
      transition: transform 0.2s ease, background 0.2s ease;
    }

    .links-grid a:hover {
      transform: translateY(-2px);
      background: #ffffff;
      color: var(--primary-dark);
    }

    .summary-box {
      margin-top: 18px;
      padding: 22px;
      border-radius: 24px;
      background: rgba(255, 255, 255, 0.76);
      border: 1px solid var(--line);
      color: #48636b;
    }

    .site-footer {
      background: #e9f8fb;
      border-top: 1px solid var(--line);
      color: #17313a;
      padding: 26px 0;
    }

    .footer-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 18px;
      flex-wrap: wrap;
    }

    .footer-inner p {
      margin: 0;
      color: #4e6870;
      font-size: 14px;
    }

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

    .footer-links a {
      color: #23606d;
      font-size: 14px;
      font-weight: 700;
    }

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

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

    @keyframes floatIn {
      from {
        opacity: 0;
        transform: translateY(18px) scale(0.98);
      }
      to {
        opacity: 1;
        transform: translateY(0) scale(1);
      }
    }

    @media (max-width: 920px) {
      .nav-links,
      .nav-cta {
        display: none;
      }

      .menu-btn {
        display: grid;
        place-items: center;
      }

      .nav.open {
        align-items: flex-start;
        padding: 15px 0;
      }

      .nav.open .nav-links {
        position: absolute;
        left: 18px;
        right: 18px;
        top: 72px;
        display: grid;
        gap: 6px;
        padding: 12px;
        background: #ffffff;
        border: 1px solid var(--line);
        border-radius: 20px;
        box-shadow: var(--shadow);
      }

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

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

      .section {
        padding: 46px 0;
      }
    }

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

      .hero {
        padding-top: 40px;
      }

      .hero-note,
      .factor-grid,
      .service-ribbon,
      .warranty-grid,
      .links-grid,
      .qr-area {
        grid-template-columns: 1fr;
      }

      .phone-stack {
        grid-template-columns: 1fr;
      }

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

      .soft-panel,
      .contact-card,
      .quote-box {
        padding: 20px;
      }

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