:root {
      --bg: #f6fbff;
      --bg-2: #eef7ff;
      --panel: rgba(255,255,255,.88);
      --panel-solid: #ffffff;
      --text: #142033;
      --muted: #5f7188;
      --line: rgba(36, 112, 180, .16);
      --cyan: #00a8ff;
      --blue: #1769ff;
      --violet: #7657ff;
      --green: #0bbf93;
      --warm: #fff8ed;
      --shadow: 0 18px 45px rgba(25, 87, 150, .12);
      --radius-xl: 28px;
      --radius-lg: 20px;
      --radius-md: 14px;
      --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 8% 8%, rgba(0,168,255,.18), transparent 28%),
        radial-gradient(circle at 92% 14%, rgba(118,87,255,.16), transparent 24%),
        linear-gradient(135deg, #f9fdff 0%, #eef7ff 44%, #fffaf3 100%);
      line-height: 1.68;
      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: 50;
      background: rgba(246, 251, 255, .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: 18px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      font-weight: 800;
      letter-spacing: .02em;
      color: #10243b;
      flex-shrink: 0;
    }

    .logo-mark {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      border-radius: 14px;
      color: #ffffff;
      background: linear-gradient(135deg, var(--blue), var(--cyan) 48%, var(--violet));
      box-shadow: 0 10px 28px rgba(23,105,255,.26);
      position: relative;
      overflow: hidden;
    }

    .logo-mark::after {
      content: "";
      position: absolute;
      inset: -30%;
      background: linear-gradient(90deg, transparent, rgba(255,255,255,.45), transparent);
      transform: translateX(-120%) rotate(20deg);
      animation: shine 5s ease-in-out infinite;
    }

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

    .logo-text strong {
      font-size: 18px;
    }

    .logo-text span {
      font-size: 12px;
      color: var(--muted);
      font-weight: 600;
    }

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

    .nav-links a {
      padding: 9px 12px;
      color: #2d4057;
      font-size: 14px;
      border-radius: 999px;
      transition: .22s ease;
      white-space: nowrap;
    }

    .nav-links a:hover {
      color: var(--blue);
      background: rgba(23,105,255,.08);
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 15px;
      border-radius: 999px;
      background: #10243b;
      color: #ffffff;
      font-size: 14px;
      font-weight: 700;
      box-shadow: 0 10px 24px rgba(16,36,59,.18);
      transition: .22s ease;
      white-space: nowrap;
    }

    .nav-cta:hover {
      transform: translateY(-2px);
      background: #17365c;
    }

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

    main {
      position: relative;
    }

    .hero {
      padding: 58px 0 40px;
      position: relative;
    }

    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image:
        linear-gradient(rgba(23,105,255,.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(23,105,255,.06) 1px, transparent 1px);
      background-size: 36px 36px;
      mask-image: linear-gradient(to bottom, #000, transparent 82%);
      pointer-events: none;
    }

    .hero-grid {
      position: relative;
      display: grid;
      grid-template-columns: minmax(0, 1.06fr) minmax(320px, .78fr);
      gap: 30px;
      align-items: center;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      border-radius: 999px;
      color: #17466d;
      background: rgba(255,255,255,.76);
      border: 1px solid rgba(0,168,255,.24);
      box-shadow: 0 8px 22px rgba(0,168,255,.08);
      font-size: 13px;
      font-weight: 700;
    }

    .pulse-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--green);
      box-shadow: 0 0 0 6px rgba(11,191,147,.12);
      animation: pulse 2s infinite;
    }

    h1 {
      margin: 18px 0 14px;
      font-size: clamp(32px, 6vw, 58px);
      line-height: 1.08;
      letter-spacing: -0.05em;
      color: #0d2138;
    }

    .hero-desc {
      margin: 0;
      max-width: 720px;
      font-size: 17px;
      color: #40566f;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 46px;
      padding: 12px 18px;
      border-radius: 14px;
      font-weight: 800;
      font-size: 15px;
      transition: transform .22s ease, box-shadow .22s ease, background .22s ease;
      border: 1px solid transparent;
    }

    .btn-primary {
      color: #ffffff;
      background: linear-gradient(135deg, var(--blue), var(--cyan));
      box-shadow: 0 16px 30px rgba(23,105,255,.22);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 20px 36px rgba(23,105,255,.28);
    }

    .btn-ghost {
      color: #14385e;
      background: rgba(255,255,255,.82);
      border-color: rgba(23,105,255,.22);
    }

    .btn-ghost:hover {
      transform: translateY(-2px);
      background: #ffffff;
      box-shadow: 0 14px 26px rgba(25, 87, 150, .12);
    }

    .hero-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 24px;
    }

    .hero-tags span {
      padding: 7px 10px;
      border-radius: 999px;
      color: #37516a;
      background: rgba(255,255,255,.72);
      border: 1px solid rgba(36,112,180,.14);
      font-size: 13px;
    }

    .device-card {
      position: relative;
      padding: 18px;
      border-radius: var(--radius-xl);
      background: linear-gradient(145deg, rgba(255,255,255,.92), rgba(238,247,255,.88));
      border: 1px solid rgba(23,105,255,.18);
      box-shadow: var(--shadow);
      overflow: hidden;
    }

    .device-card::before {
      content: "";
      position: absolute;
      width: 220px;
      height: 220px;
      right: -70px;
      top: -80px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(0,168,255,.25), transparent 68%);
      animation: floatGlow 6s ease-in-out infinite;
    }

    .phone-frame {
      position: relative;
      border-radius: 26px;
      padding: 14px;
      background: #0f2438;
      box-shadow: inset 0 0 0 1px rgba(255,255,255,.12), 0 20px 42px rgba(16,36,59,.22);
    }

    .phone-frame img {
      width: 100%;
      border-radius: 18px;
      aspect-ratio: 4 / 3;
      object-fit: contain;
      background: #f7fbff;
    }

    .signal-panel {
      margin-top: 14px;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      position: relative;
    }

    .signal-item {
      padding: 12px 10px;
      border-radius: 16px;
      background: rgba(255,255,255,.82);
      border: 1px solid rgba(23,105,255,.14);
    }

    .signal-item strong {
      display: block;
      color: #10243b;
      font-size: 15px;
    }

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

    .section {
      padding: 38px 0;
    }

    .section-head {
      display: flex;
      justify-content: space-between;
      align-items: end;
      gap: 24px;
      margin-bottom: 22px;
    }

    .section-kicker {
      margin: 0 0 8px;
      color: var(--blue);
      font-size: 13px;
      font-weight: 800;
      letter-spacing: .08em;
      text-transform: uppercase;
    }

    h2 {
      margin: 0;
      color: #10243b;
      font-size: clamp(25px, 4vw, 38px);
      line-height: 1.18;
      letter-spacing: -0.03em;
    }

    .section-note {
      max-width: 390px;
      margin: 0;
      color: var(--muted);
      font-size: 15px;
    }

    .toc-strip {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 10px;
      padding: 12px;
      border-radius: 22px;
      background: rgba(255,255,255,.76);
      border: 1px solid rgba(23,105,255,.14);
      box-shadow: 0 14px 32px rgba(25,87,150,.08);
    }

    .toc-strip a {
      padding: 12px 10px;
      border-radius: 14px;
      color: #26445f;
      text-align: center;
      font-size: 14px;
      font-weight: 700;
      background: rgba(246,251,255,.82);
      transition: .22s ease;
    }

    .toc-strip a:hover {
      color: #ffffff;
      background: linear-gradient(135deg, var(--blue), var(--cyan));
      transform: translateY(-2px);
    }

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

    .service-card {
      padding: 20px;
      border-radius: var(--radius-lg);
      background: var(--panel);
      border: 1px solid var(--line);
      box-shadow: 0 12px 30px rgba(25,87,150,.08);
      transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
    }

    .service-card:hover {
      transform: translateY(-4px);
      border-color: rgba(0,168,255,.35);
      box-shadow: 0 18px 36px rgba(25,87,150,.13);
    }

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

    h3 {
      margin: 0 0 8px;
      color: #10243b;
      font-size: 18px;
      line-height: 1.35;
    }

    .service-card p,
    .step-card p,
    .warranty-card p,
    .faq-answer {
      margin: 0;
      color: var(--muted);
      font-size: 14.5px;
    }

    .solution-wrap {
      display: grid;
      grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
      gap: 18px;
      align-items: stretch;
    }

    .diagnosis-panel {
      padding: 24px;
      border-radius: var(--radius-xl);
      background: linear-gradient(145deg, #ffffff, #f1f8ff);
      border: 1px solid rgba(23,105,255,.16);
      box-shadow: var(--shadow);
    }

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

    .diagnosis-panel li {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      padding: 12px;
      border-radius: 16px;
      background: rgba(255,255,255,.74);
      border: 1px solid rgba(36,112,180,.12);
      color: #334a61;
    }

    .check {
      width: 22px;
      height: 22px;
      flex: 0 0 auto;
      display: grid;
      place-items: center;
      border-radius: 50%;
      color: #ffffff;
      background: var(--green);
      font-size: 13px;
      font-weight: 900;
    }

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

    .step-card {
      padding: 20px;
      border-radius: var(--radius-lg);
      background: rgba(255,255,255,.86);
      border: 1px solid var(--line);
      position: relative;
      overflow: hidden;
    }

    .step-card::after {
      content: "";
      position: absolute;
      width: 74px;
      height: 74px;
      right: -28px;
      bottom: -28px;
      border-radius: 50%;
      background: rgba(0,168,255,.12);
    }

    .step-no {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 34px;
      height: 34px;
      margin-bottom: 12px;
      border-radius: 12px;
      background: #e9f4ff;
      color: var(--blue);
      font-weight: 900;
    }

    .support-band {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      align-items: stretch;
    }

    .warranty-card {
      padding: 22px;
      border-radius: var(--radius-xl);
      background: rgba(255,255,255,.86);
      border: 1px solid rgba(23,105,255,.15);
      box-shadow: 0 14px 34px rgba(25,87,150,.08);
    }

    .warranty-card ul {
      list-style: none;
      margin: 16px 0 0;
      padding: 0;
      display: grid;
      gap: 10px;
    }

    .warranty-card li {
      padding: 12px 13px;
      border-radius: 14px;
      color: #344b61;
      background: #f6fbff;
      border: 1px solid rgba(36,112,180,.12);
      font-size: 14px;
    }

    .contact-card {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 220px;
      gap: 18px;
      padding: 24px;
      border-radius: 30px;
      background:
        linear-gradient(135deg, rgba(255,255,255,.92), rgba(239,248,255,.9)),
        radial-gradient(circle at 90% 20%, rgba(118,87,255,.14), transparent 30%);
      border: 1px solid rgba(23,105,255,.16);
      box-shadow: var(--shadow);
      align-items: center;
    }

    .contact-list {
      display: grid;
      gap: 11px;
      margin: 18px 0 0;
    }

    .contact-row {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      color: #334a61;
    }

    .contact-row strong {
      color: #10243b;
      min-width: 74px;
    }

    .qr-box {
      padding: 12px;
      border-radius: 22px;
      background: #ffffff;
      border: 1px solid rgba(23,105,255,.16);
      box-shadow: 0 12px 24px rgba(25,87,150,.08);
      text-align: center;
    }

    .qr-box img {
      width: 100%;
      border-radius: 14px;
      aspect-ratio: 1 / 1;
      object-fit: contain;
      background: #f7fbff;
    }

    .qr-box span {
      display: block;
      margin-top: 8px;
      color: #35506a;
      font-size: 13px;
      font-weight: 700;
    }

    .map-link {
      color: #005fcc;
      font-weight: 800;
      text-decoration: none;
    }

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

    .faq-item {
      border-radius: 18px;
      background: rgba(255,255,255,.88);
      border: 1px solid rgba(23,105,255,.15);
      overflow: hidden;
      box-shadow: 0 10px 24px rgba(25,87,150,.06);
    }

    .faq-question {
      width: 100%;
      display: flex;
      justify-content: space-between;
      gap: 16px;
      align-items: center;
      padding: 18px 20px;
      border: 0;
      background: transparent;
      color: #10243b;
      text-align: left;
      font-size: 16px;
      font-weight: 800;
      cursor: pointer;
    }

    .faq-question span:last-child {
      flex: 0 0 auto;
      width: 28px;
      height: 28px;
      display: grid;
      place-items: center;
      border-radius: 50%;
      background: #eaf5ff;
      color: var(--blue);
      transition: transform .22s ease;
    }

    .faq-answer {
      display: none;
      padding: 0 20px 18px;
    }

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

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

    .links-panel {
      padding: 22px;
      border-radius: 24px;
      background: rgba(255,255,255,.8);
      border: 1px solid rgba(23,105,255,.14);
    }

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

    .links-grid a {
      padding: 12px;
      border-radius: 14px;
      color: #294863;
      background: #f6fbff;
      border: 1px solid rgba(36,112,180,.12);
      font-size: 14px;
      transition: .22s ease;
    }

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

    .site-footer {
      margin-top: 18px;
      padding: 28px 0;
      background: #10243b;
      color: #ffffff;
    }

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

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

    .footer-brand .logo-mark {
      width: 38px;
      height: 38px;
      box-shadow: none;
    }

    .footer-info {
      color: rgba(255,255,255,.76);
      font-size: 13px;
    }

    .footer-info a {
      color: #8fdcff;
      font-weight: 700;
    }

    .reveal {
      opacity: 0;
      transform: translateY(18px);
      transition: opacity .6s ease, transform .6s ease;
    }

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

    @keyframes shine {
      0%, 58% { transform: translateX(-120%) rotate(20deg); }
      72%, 100% { transform: translateX(140%) rotate(20deg); }
    }

    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(11,191,147,.28); }
      70% { box-shadow: 0 0 0 10px rgba(11,191,147,0); }
      100% { box-shadow: 0 0 0 0 rgba(11,191,147,0); }
    }

    @keyframes floatGlow {
      0%,100% { transform: translate3d(0,0,0); opacity: .9; }
      50% { transform: translate3d(-10px,12px,0); opacity: .65; }
    }

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

      .nav-links {
        position: absolute;
        left: 18px;
        right: 18px;
        top: 78px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        padding: 12px;
        border-radius: 20px;
        background: rgba(255,255,255,.96);
        border: 1px solid var(--line);
        box-shadow: var(--shadow);
      }

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

      .nav-links a {
        text-align: center;
      }

      .nav-cta {
        display: none;
      }

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

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

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

      .contact-card {
        align-items: start;
      }

      .qr-box {
        max-width: 230px;
      }

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

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

      .hero {
        padding-top: 36px;
      }

      .section {
        padding: 30px 0;
      }

      .section-head {
        display: block;
      }

      .section-note {
        margin-top: 10px;
      }

      .service-grid,
      .step-grid,
      .toc-strip,
      .links-grid {
        grid-template-columns: 1fr;
      }

      .signal-panel {
        grid-template-columns: 1fr;
      }

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

      .logo-text span {
        display: none;
      }
    }