:root {
      --bg: #f4fbfc;
      --bg-2: #eaf7f9;
      --card: rgba(255, 255, 255, 0.88);
      --text: #10242b;
      --muted: #5b6e75;
      --line: rgba(9, 102, 116, 0.16);
      --cyan: #00cfe8;
      --cyan-dark: #008ca4;
      --blue: #0f6dff;
      --ink: #071b22;
      --warm: #fffaf0;
      --shadow: 0 18px 45px rgba(11, 84, 104, 0.13);
      --radius: 24px;
      --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 12% 8%, rgba(0, 207, 232, 0.23), transparent 28%),
        radial-gradient(circle at 88% 18%, rgba(15, 109, 255, 0.15), transparent 26%),
        linear-gradient(180deg, #f8feff 0%, var(--bg) 45%, #ffffff 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% - 32px, var(--container));
      margin: 0 auto;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(248, 254, 255, 0.82);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--line);
    }

    .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: 900;
      letter-spacing: 0.04em;
      color: var(--ink);
      flex: 0 0 auto;
    }

    .brand-mark {
      width: 42px;
      height: 42px;
      border-radius: 14px;
      display: grid;
      place-items: center;
      color: #01242c;
      background: linear-gradient(135deg, #c8fbff, #00cfe8 62%, #58ffdf);
      box-shadow: 0 8px 22px rgba(0, 207, 232, 0.35);
      font-size: 23px;
    }

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

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

    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 8px;
      flex: 1;
    }

    .nav-links a {
      padding: 9px 12px;
      border-radius: 999px;
      color: #23434b;
      font-size: 14px;
      font-weight: 700;
      transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
      white-space: nowrap;
    }

    .nav-links a:hover {
      background: rgba(0, 207, 232, 0.14);
      color: #006f83;
      transform: translateY(-1px);
    }

    .nav-cta {
      padding: 10px 16px;
      border-radius: 999px;
      background: var(--ink);
      color: #ffffff;
      font-weight: 800;
      font-size: 14px;
      box-shadow: 0 10px 24px rgba(7, 27, 34, 0.18);
      flex: 0 0 auto;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .nav-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 14px 28px rgba(7, 27, 34, 0.22);
    }

    .menu-toggle {
      display: none;
      border: 1px solid var(--line);
      background: #ffffff;
      color: var(--text);
      border-radius: 14px;
      padding: 9px 12px;
      font-weight: 800;
      cursor: pointer;
    }

    main {
      position: relative;
    }

    .hero {
      padding: 56px 0 34px;
    }

    .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: 1px solid rgba(0, 207, 232, 0.35);
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.78);
      color: #006f83;
      font-size: 13px;
      font-weight: 800;
      box-shadow: 0 8px 20px rgba(0, 207, 232, 0.08);
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--cyan);
      box-shadow: 0 0 0 6px rgba(0, 207, 232, 0.15);
    }

    h1 {
      margin: 18px 0 14px;
      font-size: clamp(34px, 6vw, 58px);
      line-height: 1.05;
      letter-spacing: -0.04em;
      color: var(--ink);
    }

    .lead {
      margin: 0;
      max-width: 650px;
      color: #405860;
      font-size: 18px;
    }

    .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;
      font-weight: 850;
      border: 1px solid transparent;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
      cursor: pointer;
    }

    .btn-primary {
      color: #02242c;
      background: linear-gradient(135deg, #67f3ff, #00cfe8 56%, #a9ffef);
      box-shadow: 0 16px 32px rgba(0, 207, 232, 0.26);
    }

    .btn-secondary {
      color: #12333b;
      background: #ffffff;
      border-color: var(--line);
      box-shadow: 0 12px 28px rgba(11, 84, 104, 0.08);
    }

    .btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 18px 34px rgba(0, 125, 145, 0.18);
    }

    .hero-notes {
      margin-top: 22px;
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 12px;
      max-width: 650px;
    }

    .note {
      padding: 13px 14px;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.72);
      border: 1px solid var(--line);
      color: #2c4b53;
      font-size: 14px;
      font-weight: 700;
    }

    .phone-panel {
      position: relative;
      border-radius: 34px;
      padding: 18px;
      background:
        linear-gradient(145deg, rgba(255, 255, 255, 0.92), rgba(223, 252, 255, 0.78)),
        repeating-linear-gradient(90deg, rgba(0, 207, 232, 0.08) 0 1px, transparent 1px 28px);
      border: 1px solid rgba(0, 207, 232, 0.24);
      box-shadow: var(--shadow);
      overflow: hidden;
      animation: floatSoft 5.5s ease-in-out infinite;
    }

    .phone-panel::after {
      content: "";
      position: absolute;
      inset: auto -10% -34% 20%;
      height: 210px;
      background: radial-gradient(circle, rgba(0, 207, 232, 0.28), transparent 65%);
      pointer-events: none;
    }

    .phone-image-wrap {
      position: relative;
      z-index: 1;
      border-radius: 26px;
      overflow: hidden;
      background: #e9f8fa;
      border: 1px solid rgba(7, 27, 34, 0.08);
    }

    .phone-image-wrap img {
      width: 100%;
      object-fit: contain;
      background: #ffffff;
    }

    .diagnose-chip {
      position: relative;
      z-index: 2;
      margin-top: 14px;
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 10px;
      align-items: center;
      padding: 15px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.88);
      border: 1px solid var(--line);
    }

    .diagnose-chip strong {
      display: block;
      color: var(--ink);
      font-size: 16px;
    }

    .diagnose-chip span {
      display: block;
      color: var(--muted);
      font-size: 13px;
    }

    .pulse-dot {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--cyan);
      box-shadow: 0 0 0 0 rgba(0, 207, 232, 0.4);
      animation: pulse 1.9s infinite;
    }

    section {
      padding: 34px 0;
    }

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

    .section-head h2 {
      margin: 0;
      font-size: clamp(25px, 3.2vw, 38px);
      line-height: 1.18;
      letter-spacing: -0.03em;
      color: var(--ink);
    }

    .section-head p {
      margin: 0;
      color: var(--muted);
      max-width: 520px;
    }

    .toc {
      display: grid;
      grid-template-columns: repeat(6, minmax(0, 1fr));
      gap: 10px;
      padding: 12px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.7);
      border: 1px solid var(--line);
      box-shadow: 0 16px 36px rgba(11, 84, 104, 0.08);
    }

    .toc a {
      padding: 12px 10px;
      border-radius: 15px;
      text-align: center;
      color: #1b414a;
      font-size: 14px;
      font-weight: 800;
      background: linear-gradient(180deg, #ffffff, #f1fcfd);
      border: 1px solid rgba(0, 207, 232, 0.13);
      transition: transform 0.2s ease, background 0.2s ease;
    }

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

    .reason-layout {
      display: grid;
      grid-template-columns: 0.92fr 1.08fr;
      gap: 22px;
      align-items: stretch;
    }

    .feature-card {
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow);
    }

    .feature-card h3 {
      margin: 0 0 10px;
      color: var(--ink);
      font-size: 22px;
    }

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

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

    .signal-item {
      display: grid;
      grid-template-columns: auto 1fr;
      gap: 12px;
      align-items: start;
      padding: 14px;
      border-radius: 18px;
      background: #f5feff;
      border: 1px solid rgba(0, 207, 232, 0.16);
    }

    .signal-icon {
      width: 34px;
      height: 34px;
      border-radius: 12px;
      display: grid;
      place-items: center;
      color: #00323a;
      background: linear-gradient(135deg, #8df7ff, #e8ffff);
      font-weight: 900;
    }

    .signal-item strong {
      display: block;
      margin-bottom: 2px;
      color: #12333b;
    }

    .signal-item span {
      color: #61737a;
      font-size: 14px;
    }

    .compact-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 14px;
    }

    .mini-card {
      position: relative;
      padding: 20px;
      border-radius: 22px;
      background: linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(235, 253, 255, 0.78));
      border: 1px solid var(--line);
      overflow: hidden;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .mini-card::before {
      content: "";
      position: absolute;
      width: 80px;
      height: 80px;
      right: -28px;
      top: -28px;
      border-radius: 50%;
      background: rgba(0, 207, 232, 0.14);
    }

    .mini-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 18px 36px rgba(11, 84, 104, 0.12);
    }

    .mini-card h3 {
      margin: 0 0 8px;
      font-size: 18px;
      color: var(--ink);
      position: relative;
    }

    .mini-card p {
      margin: 0;
      color: var(--muted);
      font-size: 15px;
      position: relative;
    }

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

    .service-tile {
      padding: 20px;
      border-radius: 22px;
      background: #ffffff;
      border: 1px solid var(--line);
      box-shadow: 0 14px 30px rgba(11, 84, 104, 0.08);
    }

    .service-tile b {
      display: inline-grid;
      place-items: center;
      width: 34px;
      height: 34px;
      border-radius: 12px;
      background: #e0fbff;
      color: #006f83;
      margin-bottom: 12px;
    }

    .service-tile h3 {
      margin: 0 0 7px;
      font-size: 17px;
      color: var(--ink);
    }

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

    .solution-box {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
      align-items: start;
    }

    .steps {
      counter-reset: step;
      display: grid;
      gap: 12px;
    }

    .step {
      counter-increment: step;
      display: grid;
      grid-template-columns: auto 1fr;
      gap: 14px;
      padding: 18px;
      border-radius: 22px;
      background: #ffffff;
      border: 1px solid var(--line);
      box-shadow: 0 12px 26px rgba(11, 84, 104, 0.07);
    }

    .step::before {
      content: counter(step);
      width: 36px;
      height: 36px;
      border-radius: 13px;
      display: grid;
      place-items: center;
      background: var(--ink);
      color: #ffffff;
      font-weight: 900;
    }

    .step h3 {
      margin: 0 0 4px;
      font-size: 17px;
      color: var(--ink);
    }

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

    .quote-panel {
      padding: 26px;
      border-radius: 28px;
      background:
        linear-gradient(135deg, rgba(0, 207, 232, 0.16), rgba(255, 255, 255, 0.9)),
        linear-gradient(180deg, #ffffff, #f1fdff);
      border: 1px solid rgba(0, 207, 232, 0.24);
      box-shadow: var(--shadow);
    }

    .quote-panel h3 {
      margin: 0 0 12px;
      font-size: 23px;
      color: var(--ink);
    }

    .quote-panel p {
      margin: 0 0 14px;
      color: #415a62;
    }

    .quote-panel ul {
      margin: 0;
      padding-left: 20px;
      color: #334e56;
    }

    .quote-panel li {
      margin: 8px 0;
    }

    .warranty-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 14px;
    }

    .warranty-card {
      padding: 20px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.86);
      border: 1px solid var(--line);
    }

    .warranty-card h3 {
      margin: 0 0 8px;
      color: var(--ink);
      font-size: 17px;
    }

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

    .contact-panel {
      display: grid;
      grid-template-columns: 1.05fr 0.95fr;
      gap: 20px;
      padding: 24px;
      border-radius: 30px;
      background:
        linear-gradient(145deg, rgba(255, 255, 255, 0.95), rgba(226, 252, 255, 0.86));
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
      align-items: start;
    }

    .contact-info h2 {
      margin: 0 0 12px;
      font-size: clamp(25px, 3vw, 36px);
      color: var(--ink);
      line-height: 1.16;
    }

    .contact-list {
      display: grid;
      gap: 10px;
      margin: 18px 0 0;
    }

    .contact-row {
      display: grid;
      grid-template-columns: 86px 1fr;
      gap: 12px;
      padding: 13px 14px;
      border-radius: 17px;
      background: #ffffff;
      border: 1px solid rgba(0, 207, 232, 0.15);
    }

    .contact-row b {
      color: #006f83;
    }

    .contact-row span,
    .contact-row a {
      color: #213d45;
      font-weight: 700;
    }

    .qr-card {
      padding: 18px;
      border-radius: 24px;
      background: #ffffff;
      border: 1px solid var(--line);
      text-align: center;
    }

    .qr-card img {
      width: min(100%, 260px);
      margin: 0 auto 12px;
      border-radius: 18px;
      border: 1px solid rgba(7, 27, 34, 0.08);
      background: #ffffff;
    }

    .qr-card strong {
      display: block;
      color: var(--ink);
      font-size: 18px;
      margin-bottom: 4px;
    }

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

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

    .faq-item {
      border-radius: 20px;
      background: #ffffff;
      border: 1px solid var(--line);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      border: 0;
      background: transparent;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 18px 20px;
      color: var(--ink);
      font-size: 16px;
      font-weight: 850;
      text-align: left;
      cursor: pointer;
    }

    .faq-question span:last-child {
      width: 26px;
      height: 26px;
      border-radius: 10px;
      display: grid;
      place-items: center;
      background: #e7fbfe;
      color: #006f83;
      flex: 0 0 auto;
      transition: transform 0.2s ease;
    }

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

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

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

    .links-panel {
      padding: 22px;
      border-radius: 26px;
      background: rgba(255, 255, 255, 0.82);
      border: 1px solid var(--line);
    }

    .links-panel h2 {
      margin: 0 0 14px;
      font-size: 24px;
      color: var(--ink);
    }

    .link-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 10px 16px;
    }

    .link-grid a {
      color: #26515b;
      padding: 10px 0;
      border-bottom: 1px dashed rgba(9, 102, 116, 0.18);
      font-size: 14px;
      transition: color 0.2s ease;
    }

    .link-grid a:hover {
      color: var(--cyan-dark);
    }

    .site-footer {
      margin-top: 22px;
      background: #071b22;
      color: #dff7fb;
      border-top: 1px solid rgba(0, 207, 232, 0.2);
    }

    .footer-inner {
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 20px;
      align-items: center;
      padding: 26px 0;
    }

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

    .footer-brand .brand-mark {
      width: 38px;
      height: 38px;
      font-size: 21px;
    }

    .footer-brand strong {
      color: #ffffff;
    }

    .footer-brand p {
      margin: 2px 0 0;
      color: #a7c2c9;
      font-size: 13px;
    }

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

    .footer-links a {
      color: #dff7fb;
      font-size: 14px;
      font-weight: 700;
    }

    .footer-links a:hover {
      color: #67f3ff;
    }

    .fade-up {
      opacity: 0;
      transform: translateY(18px);
      animation: fadeUp 0.7s ease forwards;
    }

    .delay-1 {
      animation-delay: 0.08s;
    }

    .delay-2 {
      animation-delay: 0.16s;
    }

    .delay-3 {
      animation-delay: 0.24s;
    }

    @keyframes fadeUp {
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

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

    @keyframes pulse {
      0% {
        box-shadow: 0 0 0 0 rgba(0, 207, 232, 0.44);
      }
      70% {
        box-shadow: 0 0 0 16px rgba(0, 207, 232, 0);
      }
      100% {
        box-shadow: 0 0 0 0 rgba(0, 207, 232, 0);
      }
    }

    @media (max-width: 980px) {
      .menu-toggle {
        display: inline-flex;
      }

      .nav {
        flex-wrap: wrap;
        padding: 10px 0;
      }

      .nav-links {
        display: none;
        order: 3;
        width: 100%;
        flex: 0 0 100%;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 8px;
      }

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

      .nav-links a {
        background: #ffffff;
        border: 1px solid var(--line);
        text-align: center;
      }

      .nav-cta {
        display: none;
      }

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

      .toc {
        grid-template-columns: repeat(3, minmax(0, 1fr));
      }

      .service-strip,
      .warranty-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .section-head {
        align-items: flex-start;
        flex-direction: column;
        gap: 8px;
      }
    }

    @media (max-width: 680px) {
      .container {
        width: min(100% - 24px, var(--container));
      }

      .hero {
        padding-top: 34px;
      }

      .hero-notes,
      .compact-grid,
      .service-strip,
      .warranty-grid,
      .link-grid,
      .toc {
        grid-template-columns: 1fr;
      }

      .contact-row {
        grid-template-columns: 1fr;
        gap: 3px;
      }

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

      .footer-links {
        justify-content: flex-start;
      }

      .brand-text small {
        display: none;
      }
    }