:root {
      --brand: #1f66ff;
      --brand-strong: #174ed3;
      --brand-soft: #eaf1ff;
      --ink: #172033;
      --muted: #5f6b7a;
      --line: #dce5f4;
      --card: rgba(255, 255, 255, 0.88);
      --warm: #fff8ee;
      --bg: #f6f9ff;
      --shadow: 0 18px 50px rgba(31, 102, 255, 0.12);
      --radius-lg: 28px;
      --radius-md: 18px;
      --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 12% 8%, rgba(31, 102, 255, 0.14), transparent 28%),
        radial-gradient(circle at 90% 18%, rgba(255, 186, 73, 0.16), transparent 24%),
        linear-gradient(180deg, #f7fbff 0%, #ffffff 38%, #f8fbff 100%);
      line-height: 1.72;
    }

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

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

    .container {
      width: min(var(--container), calc(100% - 36px));
      margin: 0 auto;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(255, 255, 255, 0.88);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(220, 229, 244, 0.9);
    }

    .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);
      white-space: nowrap;
    }

    .logo-mark {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      color: #fff;
      background: linear-gradient(135deg, var(--brand), #47a1ff);
      border-radius: 14px;
      box-shadow: 0 10px 24px rgba(31, 102, 255, 0.22);
      font-size: 22px;
      letter-spacing: 0;
    }

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

    .brand-text small {
      margin-top: 3px;
      color: var(--muted);
      font-size: 12px;
      font-weight: 600;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 22px;
      color: #344154;
      font-size: 15px;
      font-weight: 650;
    }

    .nav-links a {
      position: relative;
      padding: 8px 0;
    }

    .nav-links a::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: 3px;
      width: 0;
      height: 2px;
      background: var(--brand);
      transition: width 0.25s ease;
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .nav-action {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 16px;
      border-radius: 999px;
      color: #fff;
      background: var(--brand);
      font-weight: 750;
      box-shadow: 0 12px 28px rgba(31, 102, 255, 0.22);
      transition: transform 0.2s ease, background 0.2s ease;
      white-space: nowrap;
    }

    .nav-action:hover {
      transform: translateY(-2px);
      background: var(--brand-strong);
    }

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

    .menu-toggle span {
      display: block;
      width: 18px;
      height: 2px;
      margin: 5px auto;
      background: var(--ink);
      border-radius: 4px;
    }

    main {
      overflow: hidden;
    }

    section {
      padding: 58px 0;
    }

    .hero {
      padding: 64px 0 46px;
    }

    .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;
      margin-bottom: 16px;
      padding: 7px 12px;
      border: 1px solid rgba(31, 102, 255, 0.18);
      border-radius: 999px;
      color: var(--brand-strong);
      background: rgba(234, 241, 255, 0.92);
      font-size: 13px;
      font-weight: 800;
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      background: #23c483;
      border-radius: 50%;
      box-shadow: 0 0 0 5px rgba(35, 196, 131, 0.12);
    }

    h1 {
      margin: 0;
      font-size: clamp(32px, 5.2vw, 56px);
      line-height: 1.1;
      letter-spacing: -1.2px;
      color: #121a2b;
    }

    .hero-lead {
      max-width: 620px;
      margin: 20px 0 0;
      color: #4d5a6d;
      font-size: 17px;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      min-height: 46px;
      padding: 12px 18px;
      border-radius: 14px;
      font-weight: 780;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    }

    .btn-primary {
      color: #fff;
      background: linear-gradient(135deg, var(--brand), #41a3ff);
      box-shadow: 0 16px 32px rgba(31, 102, 255, 0.2);
    }

    .btn-secondary {
      color: #1f3558;
      background: #fff;
      border: 1px solid var(--line);
    }

    .btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 16px 34px rgba(31, 102, 255, 0.16);
    }

    .hero-notes {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      margin-top: 28px;
      max-width: 650px;
    }

    .note {
      padding: 12px;
      border: 1px solid var(--line);
      border-radius: 16px;
      background: rgba(255, 255, 255, 0.72);
      color: #2b3748;
      font-size: 14px;
      font-weight: 700;
    }

    .visual-card {
      position: relative;
      padding: 16px;
      border: 1px solid rgba(220, 229, 244, 0.85);
      border-radius: var(--radius-lg);
      background: linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(245, 249, 255, 0.88));
      box-shadow: var(--shadow);
      animation: floatIn 0.8s ease both;
    }

    .visual-card::before {
      content: "";
      position: absolute;
      inset: 18px 18px auto auto;
      width: 92px;
      height: 92px;
      border-radius: 50%;
      background: rgba(31, 102, 255, 0.09);
      z-index: 0;
    }

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

    .photo-main,
    .photo-side {
      overflow: hidden;
      border-radius: 22px;
      background: #eef4ff;
      border: 1px solid rgba(220, 229, 244, 0.9);
    }

    .photo-main {
      aspect-ratio: 4 / 3;
    }

    .photo-side {
      display: grid;
      gap: 12px;
      background: transparent;
      border: 0;
      border-radius: 0;
    }

    .photo-small {
      overflow: hidden;
      border-radius: 20px;
      aspect-ratio: 4 / 3;
      background: #eef4ff;
      border: 1px solid rgba(220, 229, 244, 0.9);
    }

    .photo-main img,
    .photo-small img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      padding: 6px;
      transition: transform 0.45s ease;
    }

    .visual-card:hover img {
      transform: scale(1.025);
    }

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

    .strip-item {
      padding: 12px 14px;
      border-radius: 16px;
      background: #fff;
      border: 1px solid var(--line);
      color: #40506a;
      font-size: 14px;
      font-weight: 700;
    }

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

    .section-kicker {
      margin: 0 0 8px;
      color: var(--brand-strong);
      font-size: 14px;
      font-weight: 850;
      letter-spacing: 0.04em;
    }

    h2 {
      margin: 0;
      color: #142033;
      font-size: clamp(25px, 3.2vw, 38px);
      line-height: 1.2;
      letter-spacing: -0.5px;
    }

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

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

    .answer-panel {
      padding: 26px;
      border-radius: var(--radius-lg);
      background: linear-gradient(135deg, #ffffff, #edf4ff);
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
    }

    .answer-panel h3 {
      margin: 0 0 12px;
      color: #13203a;
      font-size: 23px;
      line-height: 1.3;
    }

    .answer-panel p {
      margin: 0;
      color: #506174;
    }

    .check-list {
      display: grid;
      gap: 12px;
      margin: 22px 0 0;
      padding: 0;
      list-style: none;
    }

    .check-list li {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      color: #2f3d52;
      font-weight: 650;
    }

    .check-list li::before {
      content: "✓";
      flex: 0 0 22px;
      width: 22px;
      height: 22px;
      display: grid;
      place-items: center;
      border-radius: 50%;
      color: #fff;
      background: var(--brand);
      font-size: 13px;
      line-height: 1;
      margin-top: 3px;
    }

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

    .service-card {
      padding: 20px;
      border-radius: 22px;
      border: 1px solid var(--line);
      background: rgba(255, 255, 255, 0.86);
      transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
    }

    .service-card:hover {
      transform: translateY(-4px);
      border-color: rgba(31, 102, 255, 0.35);
      box-shadow: 0 16px 34px rgba(31, 102, 255, 0.12);
    }

    .service-card h3 {
      margin: 0 0 8px;
      font-size: 18px;
      color: #15233a;
    }

    .service-card p {
      margin: 0;
      color: #627084;
      font-size: 14px;
    }

    .process {
      background: linear-gradient(180deg, rgba(234, 241, 255, 0.62), rgba(255, 255, 255, 0.66));
    }

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

    .step {
      position: relative;
      padding: 22px;
      border-radius: 24px;
      background: #fff;
      border: 1px solid var(--line);
      box-shadow: 0 12px 30px rgba(31, 102, 255, 0.08);
    }

    .step-number {
      width: 38px;
      height: 38px;
      display: grid;
      place-items: center;
      margin-bottom: 14px;
      border-radius: 13px;
      color: #fff;
      background: linear-gradient(135deg, var(--brand), #62b4ff);
      font-weight: 850;
    }

    .step h3 {
      margin: 0 0 8px;
      font-size: 17px;
      color: #15233a;
    }

    .step p {
      margin: 0;
      color: #637286;
      font-size: 14px;
    }

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

    .policy-card {
      padding: 24px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--line);
      background: #fff;
      box-shadow: 0 14px 34px rgba(31, 102, 255, 0.08);
    }

    .policy-card h3 {
      margin: 0 0 14px;
      color: #15233a;
      font-size: 21px;
    }

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

    .policy-list li {
      padding: 12px 14px;
      border-radius: 16px;
      background: #f7faff;
      color: #40506a;
      border: 1px solid #e7eefb;
      font-size: 14px;
    }

    .store-card {
      padding: 24px;
      border-radius: var(--radius-lg);
      background:
        linear-gradient(135deg, rgba(31, 102, 255, 0.96), rgba(72, 154, 255, 0.94)),
        var(--brand);
      color: #fff;
      box-shadow: 0 20px 45px rgba(31, 102, 255, 0.2);
    }

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

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

    .store-info li {
      padding: 12px 14px;
      border-radius: 16px;
      background: rgba(255, 255, 255, 0.14);
      color: #fff;
    }

    .store-card a {
      display: inline-flex;
      margin-top: 18px;
      padding: 11px 15px;
      border-radius: 14px;
      color: #14305a;
      background: #fff;
      font-weight: 800;
    }

    .faq-wrap {
      display: grid;
      gap: 12px;
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      border: 1px solid var(--line);
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.88);
      overflow: hidden;
      box-shadow: 0 10px 26px rgba(31, 102, 255, 0.06);
    }

    .faq-question {
      width: 100%;
      padding: 18px 20px;
      display: flex;
      justify-content: space-between;
      gap: 14px;
      align-items: center;
      border: 0;
      background: transparent;
      color: #172033;
      font: inherit;
      font-weight: 820;
      text-align: left;
      cursor: pointer;
    }

    .faq-question::after {
      content: "+";
      width: 26px;
      height: 26px;
      display: grid;
      place-items: center;
      border-radius: 50%;
      color: var(--brand);
      background: var(--brand-soft);
      flex: 0 0 auto;
      font-weight: 850;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.28s ease;
    }

    .faq-answer p {
      margin: 0;
      padding: 0 20px 18px;
      color: #5c697b;
      font-size: 15px;
    }

    .links-section {
      padding-top: 36px;
    }

    .link-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      margin-top: 18px;
    }

    .link-grid a {
      padding: 12px 14px;
      border-radius: 15px;
      background: #fff;
      border: 1px solid var(--line);
      color: #33445c;
      font-size: 14px;
      transition: transform 0.2s ease, border-color 0.2s ease, color 0.2s ease;
    }

    .link-grid a:hover {
      transform: translateY(-2px);
      border-color: rgba(31, 102, 255, 0.38);
      color: var(--brand-strong);
    }

    .site-footer {
      padding: 28px 0;
      background: #10213d;
      color: #eaf1ff;
    }

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

    .footer-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 850;
    }

    .footer-logo {
      width: 36px;
      height: 36px;
      display: grid;
      place-items: center;
      border-radius: 12px;
      color: #10213d;
      background: #ffffff;
      font-size: 20px;
    }

    .footer-meta {
      margin: 0;
      color: #bfd0ea;
      font-size: 13px;
    }

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

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

    @keyframes floatIn {
      from {
        opacity: 0;
        transform: translateY(18px) scale(0.98);
      }
      to {
        opacity: 1;
        transform: translateY(0) scale(1);
      }
    }

    @media (max-width: 920px) {
      .menu-toggle {
        display: inline-block;
      }

      .nav-links {
        position: absolute;
        left: 18px;
        right: 18px;
        top: 72px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
        padding: 14px;
        border: 1px solid var(--line);
        border-radius: 20px;
        background: #fff;
        box-shadow: var(--shadow);
      }

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

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

      .nav-action {
        width: 100%;
      }

      .hero-grid,
      .solution-layout,
      .assurance-grid {
        grid-template-columns: 1fr;
      }

      .section-head {
        display: block;
      }

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

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

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

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

      section {
        padding: 42px 0;
      }

      .hero {
        padding-top: 42px;
      }

      .hero-actions,
      .footer-inner {
        flex-direction: column;
        align-items: stretch;
      }

      .hero-notes,
      .service-grid,
      .steps,
      .inspection-strip,
      .link-grid {
        grid-template-columns: 1fr;
      }

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

      .photo-side {
        grid-template-columns: 1fr 1fr;
      }

      .footer-inner {
        text-align: left;
      }
    }