:root {
      --bg: #f7fbff;
      --bg-2: #eef6ff;
      --panel: rgba(255, 255, 255, 0.86);
      --panel-solid: #ffffff;
      --text: #102033;
      --muted: #5d6b7e;
      --line: rgba(40, 119, 255, 0.18);
      --cyan: #00a8ff;
      --blue: #2563eb;
      --violet: #7c3aed;
      --green: #00a884;
      --warning: #b45309;
      --shadow: 0 22px 60px rgba(37, 99, 235, 0.13);
      --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% 12%, rgba(0, 168, 255, 0.18), transparent 30%),
        radial-gradient(circle at 88% 18%, rgba(124, 58, 237, 0.13), transparent 28%),
        linear-gradient(135deg, #ffffff 0%, var(--bg) 42%, var(--bg-2) 100%);
      line-height: 1.65;
      overflow-x: hidden;
    }

    body::before {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      opacity: 0.34;
      background-image:
        linear-gradient(rgba(37, 99, 235, 0.055) 1px, transparent 1px),
        linear-gradient(90deg, rgba(37, 99, 235, 0.055) 1px, transparent 1px);
      background-size: 34px 34px;
      mask-image: linear-gradient(to bottom, rgba(0,0,0,0.9), rgba(0,0,0,0.12));
    }

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

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

    .container {
      width: min(100% - 32px, var(--container));
      margin: 0 auto;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 30;
      background: rgba(247, 251, 255, 0.86);
      backdrop-filter: blur(18px);
      border-bottom: 1px solid var(--line);
    }

    .nav {
      min-height: 76px;
      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: 0.04em;
      color: #0f172a;
      white-space: nowrap;
    }

    .logo {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      border-radius: 14px;
      color: #ffffff;
      background: linear-gradient(135deg, var(--blue), var(--cyan));
      box-shadow: 0 0 0 6px rgba(37, 99, 235, 0.09), 0 12px 28px rgba(37, 99, 235, 0.22);
      font-size: 22px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 6px;
    }

    .nav-links a {
      padding: 10px 12px;
      border-radius: 999px;
      font-size: 14px;
      color: #26374f;
      transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
    }

    .nav-links a:hover {
      background: rgba(37, 99, 235, 0.1);
      color: var(--blue);
      transform: translateY(-1px);
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 42px;
      padding: 10px 16px;
      border-radius: 999px;
      color: #ffffff;
      background: linear-gradient(135deg, var(--blue), var(--violet));
      box-shadow: 0 14px 30px rgba(37, 99, 235, 0.22);
      font-weight: 700;
      white-space: nowrap;
    }

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

    .hero {
      padding: 58px 0 36px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr);
      gap: 28px;
      align-items: center;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      border-radius: 999px;
      color: #164e63;
      background: rgba(6, 182, 212, 0.12);
      border: 1px solid rgba(6, 182, 212, 0.24);
      font-size: 13px;
      font-weight: 700;
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--green);
      box-shadow: 0 0 0 6px rgba(0, 168, 132, 0.12);
    }

    h1 {
      margin: 20px 0 16px;
      font-size: clamp(34px, 7vw, 64px);
      line-height: 1.08;
      letter-spacing: -0.04em;
      color: #0b1324;
    }

    .lead {
      margin: 0;
      max-width: 680px;
      color: #41516a;
      font-size: clamp(16px, 2vw, 19px);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 48px;
      padding: 12px 20px;
      border-radius: 15px;
      border: 1px solid transparent;
      font-weight: 800;
      transition: transform 0.22s ease, box-shadow 0.22s ease, background 0.22s ease;
    }

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

    .btn-primary {
      color: #ffffff;
      background: linear-gradient(135deg, var(--blue), var(--cyan));
      box-shadow: 0 16px 38px rgba(37, 99, 235, 0.24);
    }

    .btn-ghost {
      color: var(--text);
      background: rgba(255, 255, 255, 0.75);
      border-color: var(--line);
    }

    .hero-note {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
      margin-top: 28px;
      max-width: 690px;
    }

    .note-item {
      padding: 14px;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.72);
      border: 1px solid var(--line);
    }

    .note-item strong {
      display: block;
      color: #0f172a;
      font-size: 15px;
      margin-bottom: 2px;
    }

    .note-item span {
      color: var(--muted);
      font-size: 13px;
    }

    .device-card {
      position: relative;
      padding: 18px;
      border-radius: var(--radius-xl);
      background: linear-gradient(145deg, rgba(255,255,255,0.9), rgba(235,246,255,0.86));
      border: 1px solid rgba(37, 99, 235, 0.2);
      box-shadow: var(--shadow);
      overflow: hidden;
    }

    .device-card::before {
      content: "";
      position: absolute;
      width: 190px;
      height: 190px;
      right: -54px;
      top: -58px;
      background: radial-gradient(circle, rgba(0,168,255,0.35), transparent 68%);
      animation: pulseGlow 5s ease-in-out infinite;
    }

    .phone-frame {
      position: relative;
      z-index: 1;
      padding: 12px;
      border-radius: 24px;
      background: #0f172a;
      box-shadow: inset 0 0 0 1px rgba(255,255,255,0.12), 0 24px 50px rgba(15, 23, 42, 0.2);
    }

    .phone-frame img {
      width: 100%;
      border-radius: 16px;
      aspect-ratio: 4 / 3;
      object-fit: cover;
      background: #e2e8f0;
    }

    .status-strip {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
      margin-top: 14px;
    }

    .status-chip {
      padding: 12px;
      border-radius: 16px;
      background: rgba(255,255,255,0.78);
      border: 1px solid var(--line);
      color: #1e293b;
      font-size: 13px;
      font-weight: 700;
    }

    section {
      padding: 38px 0;
    }

    .section-head {
      display: flex;
      align-items: end;
      justify-content: space-between;
      gap: 18px;
      margin-bottom: 22px;
    }

    .section-head h2 {
      margin: 0;
      font-size: clamp(26px, 4vw, 40px);
      line-height: 1.18;
      color: #0f172a;
      letter-spacing: -0.03em;
    }

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

    .panel {
      border-radius: var(--radius-xl);
      background: var(--panel);
      border: 1px solid var(--line);
      box-shadow: 0 16px 48px rgba(15, 23, 42, 0.08);
      backdrop-filter: blur(16px);
    }

    .quick-grid {
      display: grid;
      grid-template-columns: 0.92fr 1.08fr;
      gap: 18px;
      align-items: stretch;
    }

    .answer-card {
      padding: 26px;
    }

    .answer-card h3,
    .service-card h3,
    .solution-card h3,
    .warranty-card h3,
    .contact-card h3 {
      margin: 0 0 10px;
      color: #0f172a;
      font-size: 20px;
    }

    .answer-card p,
    .service-card p,
    .solution-card p,
    .warranty-card p,
    .contact-card p {
      margin: 0;
      color: var(--muted);
    }

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

    .check-list li {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      color: #334155;
    }

    .check-list li::before {
      content: "";
      flex: 0 0 10px;
      width: 10px;
      height: 10px;
      margin-top: 8px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--cyan), var(--blue));
      box-shadow: 0 0 0 5px rgba(0, 168, 255, 0.1);
    }

    .toc {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
      padding: 18px;
    }

    .toc a {
      display: flex;
      align-items: center;
      min-height: 58px;
      padding: 14px 16px;
      border-radius: 18px;
      color: #17324d;
      background: linear-gradient(135deg, rgba(255,255,255,0.88), rgba(234,246,255,0.86));
      border: 1px solid rgba(37, 99, 235, 0.14);
      font-weight: 750;
      transition: transform 0.2s ease, border-color 0.2s ease;
    }

    .toc a:hover {
      transform: translateY(-2px);
      border-color: rgba(37, 99, 235, 0.36);
    }

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

    .service-card {
      padding: 22px;
      border-radius: 22px;
      background: linear-gradient(180deg, rgba(255,255,255,0.92), rgba(239,248,255,0.78));
      border: 1px solid var(--line);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 42px rgba(37, 99, 235, 0.14);
    }

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

    .solution-wrap {
      display: grid;
      grid-template-columns: minmax(0, 1fr) minmax(300px, 0.82fr);
      gap: 18px;
      align-items: start;
    }

    .steps {
      display: grid;
      gap: 14px;
      padding: 22px;
    }

    .step {
      display: grid;
      grid-template-columns: 42px 1fr;
      gap: 14px;
      align-items: start;
      padding: 16px;
      border-radius: 18px;
      background: rgba(255,255,255,0.78);
      border: 1px solid rgba(37, 99, 235, 0.12);
    }

    .step span {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      border-radius: 14px;
      color: #ffffff;
      background: #0f172a;
      font-weight: 900;
    }

    .step h3 {
      margin: 0 0 4px;
      font-size: 18px;
    }

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

    .solution-card {
      padding: 24px;
    }

    .mini-table {
      width: 100%;
      border-collapse: collapse;
      margin-top: 16px;
      overflow: hidden;
      border-radius: 16px;
      background: #ffffff;
    }

    .mini-table th,
    .mini-table td {
      padding: 13px 12px;
      border-bottom: 1px solid #e8eef7;
      text-align: left;
      vertical-align: top;
      color: #334155;
      font-size: 14px;
    }

    .mini-table th {
      color: #0f172a;
      background: #eff6ff;
      font-weight: 800;
    }

    .mini-table tr:last-child td {
      border-bottom: 0;
    }

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

    .warranty-card {
      padding: 20px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.84);
      border: 1px solid var(--line);
    }

    .tag {
      display: inline-flex;
      margin-bottom: 10px;
      padding: 5px 10px;
      border-radius: 999px;
      color: #075985;
      background: rgba(14, 165, 233, 0.12);
      font-size: 12px;
      font-weight: 800;
    }

    .contact-grid {
      display: grid;
      grid-template-columns: minmax(0, 1fr) minmax(260px, 0.58fr);
      gap: 18px;
      align-items: stretch;
    }

    .contact-card {
      padding: 24px;
    }

    .contact-list {
      display: grid;
      gap: 12px;
      margin-top: 16px;
    }

    .contact-row {
      display: flex;
      gap: 12px;
      align-items: flex-start;
      padding: 14px;
      border-radius: 18px;
      background: rgba(255,255,255,0.76);
      border: 1px solid rgba(37, 99, 235, 0.12);
      color: #334155;
    }

    .contact-row strong {
      color: #0f172a;
      min-width: 76px;
    }

    .qr-box {
      padding: 22px;
      display: grid;
      align-content: start;
      gap: 14px;
      text-align: center;
    }

    .qr-box img {
      width: min(100%, 220px);
      margin: 0 auto;
      border-radius: 20px;
      border: 1px solid var(--line);
      background: #ffffff;
      padding: 10px;
    }

    .map-link {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 44px;
      padding: 10px 14px;
      border-radius: 14px;
      color: #0b3b75;
      background: rgba(37, 99, 235, 0.1);
      border: 1px solid rgba(37, 99, 235, 0.18);
      font-weight: 800;
    }

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

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

    summary {
      cursor: pointer;
      padding: 18px 20px;
      color: #0f172a;
      font-weight: 850;
      list-style: none;
    }

    summary::-webkit-details-marker {
      display: none;
    }

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

    .links-panel {
      padding: 22px;
    }

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

    .link-cloud a {
      padding: 9px 12px;
      border-radius: 999px;
      background: rgba(255,255,255,0.78);
      border: 1px solid rgba(37, 99, 235, 0.14);
      color: #334155;
      font-size: 13px;
      transition: color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
    }

    .link-cloud a:hover {
      color: var(--blue);
      border-color: rgba(37, 99, 235, 0.38);
      transform: translateY(-1px);
    }

    .site-footer {
      margin-top: 10px;
      padding: 26px 0;
      color: #dbeafe;
      background: linear-gradient(135deg, #0f172a, #17324f);
      border-top: 1px solid rgba(255,255,255,0.12);
    }

    .footer-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
    }

    .footer-inner a {
      color: #bfdbfe;
      font-weight: 700;
    }

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

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

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

    @keyframes pulseGlow {
      0%, 100% {
        transform: scale(1);
        opacity: 0.8;
      }
      50% {
        transform: scale(1.12);
        opacity: 0.5;
      }
    }

    @media (max-width: 920px) {
      .nav {
        min-height: 68px;
      }

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

      .nav-links {
        position: absolute;
        left: 16px;
        right: 16px;
        top: 74px;
        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.is-open {
        display: flex;
      }

      .nav-links a {
        border-radius: 14px;
      }

      .nav-cta {
        display: none;
      }

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

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

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

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

      .hero {
        padding: 36px 0 24px;
      }

      section {
        padding: 28px 0;
      }

      .hero-note,
      .service-grid,
      .warranty-grid,
      .toc,
      .status-strip {
        grid-template-columns: 1fr;
      }

      .btn {
        width: 100%;
      }

      .answer-card,
      .contact-card,
      .solution-card,
      .steps,
      .links-panel {
        padding: 18px;
      }

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

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

    @media (prefers-reduced-motion: reduce) {
      html {
        scroll-behavior: auto;
      }

      *,
      *::before,
      *::after {
        animation: none !important;
        transition: none !important;
      }

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