:root {
      --blue: #002fa7;
      --blue-2: #0b55ff;
      --blue-3: #eaf0ff;
      --ink: #172033;
      --muted: #5f6b7a;
      --line: rgba(0, 47, 167, 0.14);
      --card: rgba(255, 255, 255, 0.88);
      --warm: #fbfcff;
      --white: #ffffff;
      --shadow: 0 18px 48px rgba(0, 47, 167, 0.12);
      --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(--ink);
      background:
        radial-gradient(circle at 9% 6%, rgba(0, 47, 167, 0.13), transparent 28%),
        radial-gradient(circle at 88% 14%, rgba(11, 85, 255, 0.11), transparent 30%),
        linear-gradient(180deg, #f7f9ff 0%, #ffffff 42%, #f5f8ff 100%);
      line-height: 1.72;
      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(255, 255, 255, 0.9);
      backdrop-filter: blur(18px);
      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: var(--ink);
      letter-spacing: 0.02em;
      flex: 0 0 auto;
    }

    .logo-mark {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      border-radius: 14px;
      color: #fff;
      background: linear-gradient(135deg, var(--blue), var(--blue-2));
      box-shadow: 0 12px 28px rgba(0, 47, 167, 0.22);
      font-size: 22px;
      line-height: 1;
    }

    .brand-name {
      display: flex;
      flex-direction: column;
      line-height: 1.2;
    }

    .brand-name small {
      margin-top: 2px;
      font-size: 12px;
      color: var(--muted);
      font-weight: 600;
    }

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

    .nav-links a {
      padding: 9px 12px;
      border-radius: 999px;
      color: #273247;
      font-size: 14px;
      font-weight: 650;
      transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
      white-space: nowrap;
    }

    .nav-links a:hover {
      color: var(--blue);
      background: var(--blue-3);
      transform: translateY(-1px);
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 16px;
      border-radius: 999px;
      background: var(--blue);
      color: #fff;
      font-size: 14px;
      font-weight: 750;
      box-shadow: 0 14px 30px rgba(0, 47, 167, 0.24);
      white-space: nowrap;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .nav-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 18px 38px rgba(0, 47, 167, 0.3);
    }

    .menu-toggle {
      display: none;
      width: 42px;
      height: 42px;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: #fff;
      color: var(--blue);
      font-size: 22px;
      cursor: pointer;
    }

    main {
      display: block;
    }

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

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.95fr);
      align-items: center;
      gap: 34px;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      border: 1px solid rgba(0, 47, 167, 0.16);
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.78);
      color: var(--blue);
      font-size: 13px;
      font-weight: 750;
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--blue-2);
      box-shadow: 0 0 0 6px rgba(11, 85, 255, 0.12);
    }

    h1 {
      margin: 18px 0 16px;
      font-size: clamp(32px, 6vw, 58px);
      line-height: 1.08;
      letter-spacing: -0.04em;
      color: #111a2c;
    }

    .lead {
      max-width: 680px;
      margin: 0;
      color: #455164;
      font-size: clamp(16px, 2.4vw, 19px);
    }

    .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;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--blue), var(--blue-2));
      color: #fff;
      box-shadow: 0 16px 36px rgba(0, 47, 167, 0.25);
    }

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

    .btn-secondary {
      color: var(--blue);
      background: #fff;
      border: 1px solid rgba(0, 47, 167, 0.18);
      box-shadow: 0 12px 26px rgba(0, 47, 167, 0.08);
    }

    .hero-note {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 10px;
      margin-top: 28px;
      max-width: 680px;
    }

    .note-chip {
      padding: 12px;
      border-radius: 16px;
      background: rgba(255, 255, 255, 0.78);
      border: 1px solid var(--line);
      color: #344052;
      font-size: 13px;
      font-weight: 700;
      text-align: center;
    }

    .phone-showcase {
      position: relative;
      padding: 16px;
      border-radius: 34px;
      background: linear-gradient(145deg, rgba(255, 255, 255, 0.96), rgba(234, 240, 255, 0.82));
      border: 1px solid rgba(0, 47, 167, 0.13);
      box-shadow: var(--shadow);
      overflow: hidden;
    }

    .phone-showcase::before {
      content: "";
      position: absolute;
      inset: -80px auto auto -70px;
      width: 190px;
      height: 190px;
      border-radius: 50%;
      background: rgba(0, 47, 167, 0.16);
      filter: blur(10px);
    }

    .image-stack {
      position: relative;
      display: grid;
      grid-template-columns: 1fr 0.72fr;
      gap: 12px;
      align-items: stretch;
    }

    .image-frame {
      position: relative;
      overflow: hidden;
      border-radius: 24px;
      background: #edf3ff;
      border: 1px solid rgba(0, 47, 167, 0.12);
    }

    .image-frame.large {
      aspect-ratio: 4 / 5;
    }

    .side-frames {
      display: grid;
      gap: 12px;
    }

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

    .image-frame img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transform: scale(1.01);
      transition: transform 0.5s ease;
    }

    .image-frame:hover img {
      transform: scale(1.05);
    }

    .floating-card {
      position: absolute;
      left: 18px;
      right: 18px;
      bottom: 18px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      padding: 14px;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.92);
      border: 1px solid rgba(0, 47, 167, 0.12);
      box-shadow: 0 14px 34px rgba(0, 47, 167, 0.16);
      color: #172033;
    }

    .floating-card strong {
      display: block;
      font-size: 15px;
      line-height: 1.35;
    }

    .floating-card span {
      color: var(--muted);
      font-size: 12px;
    }

    .pulse-dot {
      width: 14px;
      height: 14px;
      flex: 0 0 auto;
      border-radius: 50%;
      background: #18c37e;
      box-shadow: 0 0 0 8px rgba(24, 195, 126, 0.14);
      animation: pulse 1.8s ease-in-out infinite;
    }

    .section {
      padding: 34px 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: var(--blue);
      font-weight: 850;
      font-size: 14px;
      letter-spacing: 0.04em;
    }

    h2 {
      margin: 0;
      color: #142035;
      font-size: clamp(24px, 3.6vw, 36px);
      line-height: 1.18;
      letter-spacing: -0.02em;
    }

    h3 {
      margin: 0 0 10px;
      color: #162238;
      font-size: 19px;
      line-height: 1.35;
    }

    .section-desc {
      max-width: 470px;
      margin: 0;
      color: var(--muted);
      font-size: 15px;
    }

    .toc {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      padding: 16px;
      border-radius: 22px;
      background: var(--card);
      border: 1px solid var(--line);
      box-shadow: 0 14px 36px rgba(0, 47, 167, 0.08);
    }

    .toc a {
      display: inline-flex;
      padding: 9px 13px;
      border-radius: 999px;
      background: #f0f4ff;
      color: #17346c;
      font-size: 14px;
      font-weight: 750;
      transition: background 0.2s ease, transform 0.2s ease;
    }

    .toc a:hover {
      background: #dfe8ff;
      transform: translateY(-1px);
    }

    .diagnosis-panel {
      display: grid;
      grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
      gap: 18px;
      align-items: stretch;
    }

    .blue-panel {
      position: relative;
      padding: 26px;
      border-radius: var(--radius);
      background: linear-gradient(135deg, var(--blue), #0048d9);
      color: #fff;
      overflow: hidden;
      box-shadow: 0 18px 42px rgba(0, 47, 167, 0.2);
    }

    .blue-panel::after {
      content: "";
      position: absolute;
      right: -54px;
      bottom: -64px;
      width: 180px;
      height: 180px;
      border-radius: 50%;
      background: rgba(255, 255, 255, 0.12);
    }

    .blue-panel h2,
    .blue-panel h3 {
      color: #fff;
    }

    .blue-panel p {
      margin: 0;
      color: rgba(255, 255, 255, 0.84);
    }

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

    .check-list li {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      padding: 12px;
      border-radius: 16px;
      background: rgba(255, 255, 255, 0.1);
      color: rgba(255, 255, 255, 0.92);
    }

    .check-list li::before {
      content: "✓";
      width: 22px;
      height: 22px;
      display: grid;
      place-items: center;
      border-radius: 8px;
      background: #fff;
      color: var(--blue);
      font-weight: 900;
      flex: 0 0 auto;
      line-height: 1;
      margin-top: 2px;
    }

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

    .reason-card,
    .service-card,
    .assurance-card,
    .contact-card,
    .link-card {
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      box-shadow: 0 14px 36px rgba(0, 47, 167, 0.08);
    }

    .reason-card {
      padding: 22px;
      transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
    }

    .reason-card:hover,
    .service-card:hover,
    .assurance-card:hover {
      transform: translateY(-4px);
      border-color: rgba(0, 47, 167, 0.28);
      box-shadow: 0 20px 46px rgba(0, 47, 167, 0.13);
    }

    .number-tag {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 34px;
      height: 34px;
      margin-bottom: 14px;
      border-radius: 12px;
      background: var(--blue-3);
      color: var(--blue);
      font-weight: 900;
    }

    .reason-card p,
    .service-card p,
    .assurance-card p,
    .contact-card p,
    .link-card p {
      margin: 0;
      color: var(--muted);
      font-size: 15px;
    }

    .service-layout {
      display: grid;
      grid-template-columns: minmax(0, 1fr) minmax(280px, 0.38fr);
      gap: 18px;
      align-items: start;
    }

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

    .service-card {
      padding: 20px;
    }

    .service-icon {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      margin-bottom: 12px;
      border-radius: 15px;
      background: linear-gradient(135deg, rgba(0, 47, 167, 0.12), rgba(11, 85, 255, 0.08));
      color: var(--blue);
      font-weight: 950;
      font-size: 18px;
    }

    .info-box {
      padding: 22px;
      border-radius: var(--radius);
      background: #fff;
      border: 1px solid var(--line);
      box-shadow: 0 14px 36px rgba(0, 47, 167, 0.08);
    }

    .info-box strong {
      display: block;
      margin-bottom: 8px;
      color: #142035;
      font-size: 18px;
    }

    .info-list {
      display: grid;
      gap: 10px;
      margin: 14px 0 0;
      padding: 0;
      list-style: none;
      color: #3d4858;
      font-size: 15px;
    }

    .info-list li {
      padding-left: 16px;
      position: relative;
    }

    .info-list li::before {
      content: "";
      position: absolute;
      left: 0;
      top: 12px;
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--blue-2);
    }

    .steps {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 14px;
      counter-reset: step;
    }

    .step-card {
      position: relative;
      padding: 22px;
      border-radius: var(--radius);
      background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(238, 244, 255, 0.92));
      border: 1px solid var(--line);
      overflow: hidden;
    }

    .step-card::before {
      counter-increment: step;
      content: "0" counter(step);
      display: inline-flex;
      margin-bottom: 38px;
      color: rgba(0, 47, 167, 0.14);
      font-size: 44px;
      font-weight: 950;
      line-height: 1;
    }

    .step-card h3 {
      margin-top: -26px;
    }

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

    .assurance-card {
      padding: 20px;
      display: flex;
      gap: 14px;
      align-items: flex-start;
    }

    .assurance-card .badge {
      flex: 0 0 auto;
      min-width: 62px;
      padding: 7px 10px;
      border-radius: 999px;
      text-align: center;
      background: var(--blue);
      color: #fff;
      font-size: 13px;
      font-weight: 850;
    }

    .assurance-card h3 {
      margin-bottom: 6px;
      font-size: 17px;
    }

    .contact-wrap {
      display: grid;
      grid-template-columns: minmax(0, 0.95fr) minmax(280px, 0.45fr);
      gap: 18px;
      align-items: stretch;
    }

    .contact-card {
      padding: 24px;
    }

    .contact-main {
      background: linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(229, 237, 255, 0.92));
    }

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

    .contact-list li {
      display: flex;
      gap: 12px;
      align-items: flex-start;
      padding: 14px;
      border-radius: 18px;
      background: #fff;
      border: 1px solid rgba(0, 47, 167, 0.1);
    }

    .contact-list b {
      display: block;
      color: #162238;
    }

    .contact-list span,
    .contact-list a {
      color: var(--muted);
      font-size: 15px;
    }

    .contact-list a {
      color: var(--blue);
      font-weight: 750;
    }

    .qr-card {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      justify-content: center;
      gap: 12px;
    }

    .qr-img {
      width: min(220px, 72vw);
      padding: 10px;
      border-radius: 22px;
      background: #fff;
      border: 1px solid rgba(0, 47, 167, 0.14);
      box-shadow: 0 14px 30px rgba(0, 47, 167, 0.1);
    }

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

    .faq-item {
      border: 1px solid var(--line);
      border-radius: 20px;
      background: rgba(255, 255, 255, 0.9);
      box-shadow: 0 10px 28px rgba(0, 47, 167, 0.06);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 14px;
      padding: 18px 20px;
      border: 0;
      background: transparent;
      color: #162238;
      text-align: left;
      font-size: 16px;
      font-weight: 850;
      cursor: pointer;
    }

    .faq-question span {
      flex: 1;
    }

    .faq-question::after {
      content: "+";
      width: 28px;
      height: 28px;
      display: grid;
      place-items: center;
      border-radius: 10px;
      background: var(--blue-3);
      color: var(--blue);
      font-size: 20px;
      line-height: 1;
      flex: 0 0 auto;
    }

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

    .faq-answer {
      display: none;
      padding: 0 20px 18px;
      color: var(--muted);
      font-size: 15px;
    }

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

    .summary-band {
      padding: 28px;
      border-radius: 30px;
      background:
        radial-gradient(circle at 14% 12%, rgba(255, 255, 255, 0.24), transparent 28%),
        linear-gradient(135deg, var(--blue), #064ce0);
      color: #fff;
      display: grid;
      grid-template-columns: minmax(0, 1fr) auto;
      align-items: center;
      gap: 18px;
      box-shadow: 0 18px 48px rgba(0, 47, 167, 0.2);
    }

    .summary-band h2 {
      color: #fff;
      margin-bottom: 8px;
    }

    .summary-band p {
      margin: 0;
      color: rgba(255, 255, 255, 0.86);
    }

    .summary-band .btn {
      background: #fff;
      color: var(--blue);
      box-shadow: none;
      white-space: nowrap;
    }

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

    .link-card {
      padding: 18px;
      transition: transform 0.2s ease, border-color 0.2s ease;
    }

    .link-card:hover {
      transform: translateY(-3px);
      border-color: rgba(0, 47, 167, 0.28);
    }

    .link-card a {
      color: #14366f;
      font-weight: 850;
      line-height: 1.45;
    }

    .site-footer {
      margin-top: 24px;
      background: #06163a;
      color: #e9efff;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
    }

    .footer-inner {
      padding: 30px 0;
      display: grid;
      grid-template-columns: minmax(0, 1fr) auto;
      gap: 20px;
      align-items: center;
    }

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

    .footer-brand .logo-mark {
      box-shadow: none;
      background: #fff;
      color: var(--blue);
    }

    .footer-brand strong {
      display: block;
      color: #fff;
      font-size: 18px;
    }

    .footer-brand span,
    .copyright {
      color: rgba(233, 239, 255, 0.72);
      font-size: 13px;
    }

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

    .footer-links a {
      color: #e9efff;
      font-size: 14px;
      font-weight: 700;
      padding: 6px 0;
    }

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

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

    @keyframes pulse {
      0%, 100% {
        transform: scale(1);
        box-shadow: 0 0 0 8px rgba(24, 195, 126, 0.14);
      }
      50% {
        transform: scale(1.12);
        box-shadow: 0 0 0 12px rgba(24, 195, 126, 0.08);
      }
    }

    @media (max-width: 980px) {
      .hero-grid,
      .diagnosis-panel,
      .service-layout,
      .contact-wrap {
        grid-template-columns: 1fr;
      }

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

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

      .nav-links {
        position: absolute;
        top: 72px;
        left: 16px;
        right: 16px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        padding: 12px;
        border-radius: 20px;
        background: #fff;
        border: 1px solid var(--line);
        box-shadow: var(--shadow);
      }

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

      .nav-links a {
        padding: 12px 14px;
      }

      .nav-cta {
        display: none;
      }

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

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

      .nav {
        min-height: 66px;
      }

      .nav-links {
        top: 66px;
        left: 12px;
        right: 12px;
      }

      .brand-name small {
        display: none;
      }

      .hero {
        padding: 34px 0 24px;
      }

      .hero-note,
      .reason-grid,
      .service-grid,
      .steps,
      .warranty-grid,
      .links-grid {
        grid-template-columns: 1fr;
      }

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

      .side-frames {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .floating-card {
        position: static;
        margin-top: 12px;
      }

      .section {
        padding: 26px 0;
      }

      .blue-panel,
      .contact-card,
      .summary-band {
        padding: 22px;
      }

      .assurance-card {
        flex-direction: column;
      }

      .summary-band {
        grid-template-columns: 1fr;
      }

      .summary-band .btn {
        width: 100%;
      }

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

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

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

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

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