:root {
      --bg: #f7fbff;
      --bg-2: #eef7ff;
      --text: #122033;
      --muted: #5b6c82;
      --line: rgba(28, 84, 130, 0.16);
      --cyan: #00a8c8;
      --blue: #2c6bed;
      --pink: #d948ef;
      --green: #0f9f7a;
      --card: rgba(255, 255, 255, 0.84);
      --shadow: 0 18px 50px rgba(30, 85, 140, 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", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
      color: var(--text);
      background:
        radial-gradient(circle at 12% 8%, rgba(0, 168, 200, 0.16), transparent 28%),
        radial-gradient(circle at 88% 18%, rgba(217, 72, 239, 0.12), transparent 27%),
        linear-gradient(135deg, #ffffff 0%, var(--bg) 45%, var(--bg-2) 100%);
      line-height: 1.7;
      overflow-x: hidden;
    }

    body::before {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      background-image:
        linear-gradient(rgba(44, 107, 237, 0.055) 1px, transparent 1px),
        linear-gradient(90deg, rgba(44, 107, 237, 0.055) 1px, transparent 1px);
      background-size: 34px 34px;
      mask-image: linear-gradient(to bottom, rgba(0,0,0,0.8), rgba(0,0,0,0.18));
      z-index: -2;
    }

    body::after {
      content: "";
      position: fixed;
      width: 360px;
      height: 360px;
      right: -160px;
      bottom: 12%;
      background: radial-gradient(circle, rgba(0,168,200,0.16), transparent 67%);
      filter: blur(6px);
      pointer-events: none;
      z-index: -1;
      animation: floatGlow 8s ease-in-out infinite alternate;
    }

    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;
      backdrop-filter: blur(18px);
      background: rgba(247, 251, 255, 0.82);
      border-bottom: 1px solid var(--line);
    }

    .nav {
      min-height: 74px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      min-width: max-content;
    }

    .logo-mark {
      width: 42px;
      height: 42px;
      border-radius: 15px;
      display: grid;
      place-items: center;
      color: #ffffff;
      font-weight: 900;
      font-size: 24px;
      background: linear-gradient(135deg, var(--blue), var(--cyan) 55%, var(--pink));
      box-shadow: 0 12px 26px rgba(44, 107, 237, 0.26);
    }

    .brand-text strong {
      display: block;
      font-size: 17px;
      line-height: 1.15;
      letter-spacing: 0.02em;
    }

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

    .nav-links {
      display: flex;
      align-items: center;
      gap: 6px;
      margin-left: auto;
    }

    .nav-links a {
      color: #23364d;
      font-size: 14px;
      padding: 10px 12px;
      border-radius: 999px;
      transition: background 0.2s ease, color 0.2s ease;
    }

    .nav-links a:hover {
      background: rgba(0, 168, 200, 0.1);
      color: #006f86;
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 42px;
      padding: 10px 16px;
      border-radius: 999px;
      color: #ffffff;
      font-size: 14px;
      font-weight: 700;
      background: linear-gradient(135deg, var(--blue), var(--cyan));
      box-shadow: 0 12px 24px rgba(0, 168, 200, 0.22);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      white-space: nowrap;
    }

    .nav-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 16px 30px rgba(0, 168, 200, 0.28);
    }

    .menu-toggle {
      display: none;
      width: 44px;
      height: 44px;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: rgba(255, 255, 255, 0.78);
      color: var(--text);
      cursor: pointer;
    }

    .menu-toggle span {
      display: block;
      width: 20px;
      height: 2px;
      margin: 5px auto;
      border-radius: 99px;
      background: var(--text);
      transition: transform 0.2s ease, opacity 0.2s ease;
    }

    .hero {
      padding: 54px 0 34px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.04fr) minmax(320px, 0.96fr);
      gap: 34px;
      align-items: center;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      width: fit-content;
      color: #0b6f86;
      font-weight: 800;
      font-size: 13px;
      padding: 7px 12px;
      border: 1px solid rgba(0, 168, 200, 0.24);
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.72);
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 999px;
      background: var(--cyan);
      box-shadow: 0 0 0 6px rgba(0, 168, 200, 0.12);
    }

    h1 {
      margin: 18px 0 14px;
      max-width: 760px;
      font-size: clamp(34px, 6vw, 62px);
      line-height: 1.08;
      letter-spacing: -0.055em;
      color: #0b1626;
    }

    .hero-lead {
      margin: 0;
      max-width: 680px;
      color: #40546e;
      font-size: clamp(16px, 2.2vw, 19px);
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 24px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      min-height: 48px;
      padding: 12px 18px;
      border-radius: 16px;
      border: 1px solid transparent;
      font-weight: 800;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
      cursor: pointer;
    }

    .btn-primary {
      color: #ffffff;
      background: linear-gradient(135deg, #172ae8, var(--cyan));
      box-shadow: 0 16px 32px rgba(44, 107, 237, 0.24);
    }

    .btn-secondary {
      color: #17304d;
      background: rgba(255, 255, 255, 0.82);
      border-color: var(--line);
    }

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

    .btn-primary:hover {
      box-shadow: 0 20px 38px rgba(44, 107, 237, 0.3);
    }

    .hero-notes {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 20px;
    }

    .hero-notes span {
      color: #23364d;
      font-size: 13px;
      padding: 7px 10px;
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.72);
      border: 1px solid rgba(44, 107, 237, 0.12);
    }

    .device-panel {
      position: relative;
      padding: 16px;
      border-radius: 32px;
      border: 1px solid rgba(0, 168, 200, 0.22);
      background:
        linear-gradient(135deg, rgba(255,255,255,0.92), rgba(234,247,255,0.8)),
        radial-gradient(circle at 70% 20%, rgba(217,72,239,0.12), transparent 40%);
      box-shadow: var(--shadow);
      overflow: hidden;
    }

    .device-panel::before {
      content: "";
      position: absolute;
      inset: 12px;
      border-radius: 24px;
      border: 1px solid rgba(217, 72, 239, 0.16);
      pointer-events: none;
    }

    .phone-showcase {
      position: relative;
      display: grid;
      grid-template-columns: 1fr 0.82fr;
      gap: 12px;
      align-items: stretch;
    }

    .phone-card {
      border-radius: 24px;
      overflow: hidden;
      background: #eaf3fb;
      border: 1px solid rgba(18, 32, 51, 0.08);
    }

    .phone-card.large {
      min-height: 360px;
    }

    .phone-card.small {
      min-height: 174px;
    }

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

    .showcase-stack {
      display: grid;
      gap: 12px;
    }

    .diagnose-chip {
      position: absolute;
      left: 28px;
      bottom: 26px;
      max-width: calc(100% - 56px);
      padding: 13px 15px;
      border-radius: 18px;
      color: #142238;
      background: rgba(255, 255, 255, 0.9);
      border: 1px solid rgba(0, 168, 200, 0.18);
      box-shadow: 0 16px 38px rgba(18, 32, 51, 0.16);
      backdrop-filter: blur(14px);
    }

    .diagnose-chip strong {
      display: block;
      font-size: 15px;
    }

    .diagnose-chip span {
      display: block;
      color: var(--muted);
      font-size: 13px;
      margin-top: 2px;
    }

    section {
      padding: 42px 0;
    }

    .section-head {
      display: flex;
      align-items: flex-end;
      justify-content: space-between;
      gap: 22px;
      margin-bottom: 22px;
    }

    .section-kicker {
      margin: 0 0 7px;
      color: #0a7a92;
      font-size: 13px;
      font-weight: 900;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }

    h2 {
      margin: 0;
      font-size: clamp(25px, 3.5vw, 38px);
      line-height: 1.18;
      letter-spacing: -0.035em;
      color: #0e1c2e;
    }

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

    .toc {
      padding-top: 14px;
      padding-bottom: 22px;
    }

    .toc-box {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      padding: 14px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.7);
      border: 1px solid var(--line);
      box-shadow: 0 12px 32px rgba(30, 85, 140, 0.08);
    }

    .toc-box a {
      min-height: 42px;
      display: inline-flex;
      align-items: center;
      padding: 9px 13px;
      border-radius: 14px;
      color: #203651;
      background: rgba(238, 247, 255, 0.78);
      border: 1px solid rgba(44, 107, 237, 0.1);
      font-size: 14px;
      transition: transform 0.2s ease, background 0.2s ease;
    }

    .toc-box a:hover {
      transform: translateY(-2px);
      background: rgba(0, 168, 200, 0.12);
    }

    .answer-grid {
      display: grid;
      grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
      gap: 20px;
      align-items: stretch;
    }

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

    .answer-card h3 {
      margin: 0 0 10px;
      font-size: 21px;
      color: #102033;
    }

    .answer-card p {
      margin: 0;
      color: #435870;
    }

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

    .signal-item {
      display: grid;
      grid-template-columns: 42px 1fr;
      gap: 12px;
      align-items: start;
      padding: 15px;
      border-radius: 20px;
      background: rgba(255, 255, 255, 0.68);
      border: 1px solid rgba(44, 107, 237, 0.12);
    }

    .signal-icon {
      width: 42px;
      height: 42px;
      border-radius: 14px;
      display: grid;
      place-items: center;
      color: #ffffff;
      font-weight: 900;
      background: linear-gradient(135deg, var(--cyan), var(--blue));
    }

    .signal-item strong {
      display: block;
      color: #13243a;
      margin-bottom: 2px;
    }

    .signal-item span {
      display: block;
      color: var(--muted);
      font-size: 14px;
    }

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

    .service-card {
      position: relative;
      min-height: 154px;
      padding: 19px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.78);
      border: 1px solid var(--line);
      box-shadow: 0 14px 36px rgba(30, 85, 140, 0.09);
      overflow: hidden;
      transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
    }

    .service-card::after {
      content: "";
      position: absolute;
      width: 92px;
      height: 92px;
      right: -36px;
      top: -36px;
      border-radius: 999px;
      background: radial-gradient(circle, rgba(0,168,200,0.16), transparent 70%);
      transition: transform 0.22s ease;
    }

    .service-card:hover {
      transform: translateY(-4px);
      border-color: rgba(0, 168, 200, 0.36);
      box-shadow: 0 20px 44px rgba(30, 85, 140, 0.14);
    }

    .service-card:hover::after {
      transform: scale(1.18);
    }

    .service-card h3 {
      margin: 0 0 8px;
      font-size: 17px;
      color: #102033;
    }

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

    .solution-layout {
      display: grid;
      grid-template-columns: minmax(0, 0.84fr) minmax(0, 1.16fr);
      gap: 20px;
      align-items: start;
    }

    .diagnosis-box {
      padding: 24px;
      border-radius: var(--radius);
      background: linear-gradient(145deg, rgba(255,255,255,0.9), rgba(235,248,255,0.82));
      border: 1px solid rgba(0, 168, 200, 0.22);
      box-shadow: var(--shadow);
    }

    .diagnosis-box h3 {
      margin: 0 0 12px;
      font-size: 22px;
      color: #102033;
    }

    .diagnosis-box p {
      margin: 0 0 16px;
      color: #455a72;
    }

    .check-list {
      list-style: none;
      padding: 0;
      margin: 0;
      display: grid;
      gap: 10px;
    }

    .check-list li {
      position: relative;
      padding-left: 24px;
      color: #30465f;
      font-size: 15px;
    }

    .check-list li::before {
      content: "";
      position: absolute;
      left: 0;
      top: 10px;
      width: 9px;
      height: 9px;
      border-radius: 50%;
      background: var(--cyan);
      box-shadow: 0 0 0 5px rgba(0, 168, 200, 0.1);
    }

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

    .step {
      display: grid;
      grid-template-columns: 56px 1fr;
      gap: 14px;
      padding: 17px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.76);
      border: 1px solid var(--line);
      box-shadow: 0 12px 30px rgba(30, 85, 140, 0.08);
    }

    .step-num {
      width: 56px;
      height: 56px;
      border-radius: 18px;
      display: grid;
      place-items: center;
      color: #ffffff;
      font-weight: 900;
      background: linear-gradient(135deg, var(--blue), var(--pink));
    }

    .step h3 {
      margin: 0 0 4px;
      font-size: 17px;
      color: #102033;
    }

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

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

    .warranty-card {
      padding: 19px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.76);
      border: 1px solid var(--line);
      box-shadow: 0 12px 30px rgba(30, 85, 140, 0.08);
    }

    .warranty-card h3 {
      margin: 0 0 8px;
      font-size: 17px;
      color: #102033;
    }

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

    .contact-wrap {
      display: grid;
      grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.95fr);
      gap: 20px;
      align-items: stretch;
    }

    .contact-card {
      padding: 24px;
      border-radius: 28px;
      background: rgba(255, 255, 255, 0.82);
      border: 1px solid rgba(0, 168, 200, 0.2);
      box-shadow: var(--shadow);
    }

    .contact-card h3 {
      margin: 0 0 14px;
      font-size: 22px;
    }

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

    .info-list li {
      padding: 14px;
      border-radius: 18px;
      background: rgba(238, 247, 255, 0.8);
      border: 1px solid rgba(44, 107, 237, 0.1);
    }

    .info-list strong {
      display: block;
      margin-bottom: 2px;
      color: #102033;
    }

    .info-list span,
    .info-list a {
      color: #40546e;
      font-size: 15px;
    }

    .info-list a {
      text-decoration: underline;
      text-underline-offset: 4px;
    }

    .qr-area {
      display: grid;
      gap: 14px;
    }

    .qr-box {
      padding: 18px;
      border-radius: 24px;
      background: linear-gradient(145deg, rgba(255,255,255,0.9), rgba(238,247,255,0.86));
      border: 1px solid var(--line);
      box-shadow: 0 12px 30px rgba(30, 85, 140, 0.08);
    }

    .qr-box h3 {
      margin: 0 0 10px;
      font-size: 18px;
    }

    .qr-img {
      width: min(100%, 260px);
      margin: 0 auto 12px;
      border-radius: 18px;
      overflow: hidden;
      border: 1px solid rgba(18, 32, 51, 0.1);
      background: #ffffff;
    }

    .qr-box p {
      margin: 0;
      color: var(--muted);
      font-size: 14px;
      text-align: center;
    }

    .map-link {
      display: flex;
      align-items: center;
      justify-content: center;
      min-height: 48px;
      padding: 12px 14px;
      border-radius: 16px;
      color: #ffffff;
      font-weight: 800;
      text-align: center;
      background: linear-gradient(135deg, var(--green), var(--cyan));
    }

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

    .faq-item {
      border-radius: 20px;
      background: rgba(255, 255, 255, 0.78);
      border: 1px solid var(--line);
      box-shadow: 0 10px 26px rgba(30, 85, 140, 0.07);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      border: 0;
      background: transparent;
      color: #102033;
      min-height: 58px;
      padding: 16px 18px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      text-align: left;
      font: inherit;
      font-weight: 800;
      cursor: pointer;
    }

    .faq-question::after {
      content: "+";
      flex: 0 0 auto;
      width: 28px;
      height: 28px;
      display: grid;
      place-items: center;
      border-radius: 10px;
      color: #ffffff;
      background: linear-gradient(135deg, var(--blue), var(--cyan));
    }

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

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

    .faq-item.active .faq-answer {
      display: block;
      animation: fadeDown 0.22s ease both;
    }

    .link-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 18px;
    }

    .link-cloud a {
      padding: 9px 12px;
      border-radius: 999px;
      color: #223851;
      background: rgba(255, 255, 255, 0.78);
      border: 1px solid rgba(44, 107, 237, 0.12);
      font-size: 13px;
    }

    .summary-box {
      padding: 24px;
      border-radius: 28px;
      color: #142238;
      background:
        linear-gradient(135deg, rgba(0,168,200,0.14), rgba(217,72,239,0.08)),
        rgba(255,255,255,0.78);
      border: 1px solid rgba(0, 168, 200, 0.22);
      box-shadow: var(--shadow);
    }

    .summary-box h2 {
      margin-bottom: 10px;
    }

    .summary-box p {
      margin: 0;
      color: #40546e;
    }

    .alt-box {
      margin-top: 16px;
      padding: 14px;
      border-radius: 18px;
      background: rgba(255,255,255,0.72);
      border: 1px solid var(--line);
      color: var(--muted);
      font-size: 14px;
    }

    .site-footer {
      margin-top: 8px;
      color: #dbeafe;
      background: #102033;
      border-top: 1px solid rgba(255,255,255,0.1);
    }

    .footer-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      padding: 24px 0;
    }

    .footer-brand {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .footer-logo {
      width: 36px;
      height: 36px;
      border-radius: 13px;
      display: grid;
      place-items: center;
      color: #ffffff;
      font-weight: 900;
      background: linear-gradient(135deg, var(--blue), var(--cyan));
    }

    .footer-inner p {
      margin: 0;
      color: #b9c9dd;
      font-size: 14px;
    }

    .footer-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: flex-end;
    }

    .footer-links a {
      color: #e5f3ff;
      font-size: 14px;
    }

    .reveal {
      opacity: 0;
      transform: translateY(18px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }

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

    @keyframes floatGlow {
      from {
        transform: translate3d(0, 0, 0) scale(1);
      }
      to {
        transform: translate3d(-24px, -18px, 0) scale(1.08);
      }
    }

    @keyframes fadeDown {
      from {
        opacity: 0;
        transform: translateY(-4px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    @media (max-width: 980px) {
      .nav {
        min-height: 68px;
      }

      .menu-toggle {
        display: block;
      }

      .nav-links {
        position: absolute;
        left: 16px;
        right: 16px;
        top: 76px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
        padding: 14px;
        border-radius: 22px;
        background: rgba(255, 255, 255, 0.96);
        border: 1px solid var(--line);
        box-shadow: var(--shadow);
      }

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

      .nav-links a {
        padding: 12px 14px;
        background: rgba(238, 247, 255, 0.76);
      }

      .nav-cta {
        display: none;
      }

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

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

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

      .section-desc {
        max-width: 100%;
      }
    }

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

      .brand-text span {
        display: none;
      }

      .hero {
        padding: 34px 0 22px;
      }

      section {
        padding: 32px 0;
      }

      .hero-actions {
        flex-direction: column;
      }

      .btn {
        width: 100%;
      }

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

      .phone-card.large,
      .phone-card.small {
        min-height: 220px;
      }

      .diagnose-chip {
        position: static;
        margin-top: 12px;
        max-width: none;
      }

      .services-grid,
      .warranty-panel {
        grid-template-columns: 1fr;
      }

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

      .step-num,
      .signal-icon {
        width: 48px;
        height: 48px;
      }

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

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

    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        animation: none !important;
        transition: none !important;
        scroll-behavior: auto !important;
      }

      .reveal {
        opacity: 1;
        transform: none;
      }
    }