:root {
      --bg: #f7fbff;
      --bg-soft: #eef7ff;
      --card: #ffffff;
      --text: #162333;
      --muted: #5f6f80;
      --line: #dce8f2;
      --primary: #2779d6;
      --primary-dark: #175ca8;
      --accent: #69b7ff;
      --warm: #fff8ed;
      --green: #2b8a6f;
      --shadow: 0 18px 46px rgba(45, 96, 145, 0.12);
      --radius: 24px;
      --container: 1180px;
    }

    * {
      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 12% 8%, rgba(135, 200, 255, 0.24), transparent 28%),
        radial-gradient(circle at 88% 12%, rgba(229, 245, 255, 0.9), transparent 30%),
        linear-gradient(180deg, #f8fcff 0%, #f5faff 42%, #ffffff 100%);
      line-height: 1.7;
    }

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

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

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

    .topbar {
      position: sticky;
      top: 0;
      z-index: 30;
      background: rgba(248, 252, 255, 0.86);
      backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(220, 232, 242, 0.9);
    }

    .nav {
      min-height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 22px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 12px;
      flex: 0 0 auto;
    }

    .logo {
      width: 42px;
      height: 42px;
      border-radius: 15px;
      display: grid;
      place-items: center;
      color: #ffffff;
      font-weight: 800;
      font-size: 22px;
      background: linear-gradient(135deg, #1d73d4, #7cc4ff);
      box-shadow: 0 12px 24px rgba(39, 121, 214, 0.22);
    }

    .brand-text strong {
      display: block;
      font-size: 17px;
      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;
      justify-content: flex-end;
      gap: 18px;
      color: #304357;
      font-size: 14px;
      white-space: nowrap;
    }

    .nav-links a {
      padding: 8px 2px;
      position: relative;
    }

    .nav-links a::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: 2px;
      width: 0;
      height: 2px;
      border-radius: 999px;
      background: var(--primary);
      transition: width 0.22s ease;
    }

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

    .nav-call {
      flex: 0 0 auto;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 16px;
      border-radius: 999px;
      color: #ffffff;
      background: linear-gradient(135deg, var(--primary), #56adff);
      box-shadow: 0 12px 24px rgba(39, 121, 214, 0.22);
      font-weight: 700;
      font-size: 14px;
    }

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

    .hero {
      padding: 54px 0 36px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.06fr) minmax(330px, 0.94fr);
      gap: 34px;
      align-items: center;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      border: 1px solid rgba(39, 121, 214, 0.18);
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.78);
      color: var(--primary-dark);
      font-size: 13px;
      font-weight: 700;
      box-shadow: 0 8px 20px rgba(39, 121, 214, 0.08);
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #4fb2ff;
      box-shadow: 0 0 0 5px rgba(79, 178, 255, 0.14);
    }

    h1 {
      margin: 18px 0 14px;
      font-size: clamp(32px, 5vw, 56px);
      line-height: 1.12;
      letter-spacing: -0.04em;
      color: #102033;
    }

    .lead {
      max-width: 680px;
      margin: 0;
      color: #415468;
      font-size: 17px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px;
      margin-top: 26px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      min-height: 46px;
      padding: 12px 18px;
      border-radius: 15px;
      border: 1px solid transparent;
      cursor: pointer;
      font-weight: 800;
      transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
    }

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

    .btn-primary {
      color: #ffffff;
      background: linear-gradient(135deg, var(--primary), #55b0ff);
      box-shadow: 0 16px 30px rgba(39, 121, 214, 0.22);
    }

    .btn-ghost {
      background: rgba(255, 255, 255, 0.82);
      border-color: rgba(39, 121, 214, 0.2);
      color: var(--primary-dark);
    }

    .hero-note {
      margin-top: 18px;
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      color: var(--muted);
      font-size: 13px;
    }

    .hero-note span {
      padding: 6px 10px;
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.76);
      border: 1px solid rgba(220, 232, 242, 0.8);
    }

    .visual-card {
      position: relative;
      padding: 18px;
      border-radius: 32px;
      background: linear-gradient(145deg, rgba(255,255,255,0.92), rgba(238,247,255,0.82));
      border: 1px solid rgba(220, 232, 242, 0.9);
      box-shadow: var(--shadow);
      overflow: hidden;
      animation: floatIn 0.8s ease both;
    }

    .visual-card::before {
      content: "";
      position: absolute;
      width: 190px;
      height: 190px;
      border-radius: 50%;
      right: -70px;
      top: -70px;
      background: rgba(105, 183, 255, 0.24);
    }

    .phone-collage {
      position: relative;
      display: grid;
      grid-template-columns: 1fr 0.82fr;
      gap: 14px;
      align-items: stretch;
    }

    .photo-box {
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      background: #eef5fb;
      border: 1px solid rgba(220, 232, 242, 0.9);
      min-height: 160px;
    }

    .photo-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .photo-main {
      aspect-ratio: 4 / 5;
    }

    .photo-stack {
      display: grid;
      gap: 14px;
    }

    .photo-stack .photo-box {
      aspect-ratio: 1 / 1;
      min-height: auto;
    }

    .diagnose-pill {
      position: absolute;
      left: 24px;
      bottom: 24px;
      max-width: 82%;
      padding: 14px 16px;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.9);
      border: 1px solid rgba(220, 232, 242, 0.9);
      box-shadow: 0 14px 30px rgba(24, 58, 92, 0.14);
    }

    .diagnose-pill strong {
      display: block;
      font-size: 15px;
      color: #18324d;
    }

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

    section {
      padding: 34px 0;
    }

    .section-head {
      display: grid;
      grid-template-columns: minmax(0, 0.9fr) minmax(260px, 0.55fr);
      gap: 28px;
      align-items: end;
      margin-bottom: 22px;
    }

    .section-kicker {
      color: var(--primary-dark);
      font-weight: 800;
      font-size: 13px;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      margin-bottom: 7px;
    }

    h2 {
      margin: 0;
      color: #13263a;
      font-size: clamp(24px, 3.4vw, 36px);
      line-height: 1.25;
      letter-spacing: -0.02em;
    }

    .section-head p {
      margin: 0;
      color: var(--muted);
      font-size: 15px;
    }

    .cloud-panel {
      border: 1px solid rgba(220, 232, 242, 0.92);
      border-radius: var(--radius);
      background: rgba(255, 255, 255, 0.78);
      box-shadow: 0 16px 42px rgba(45, 96, 145, 0.08);
    }

    .service-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }

    .service-card {
      padding: 22px;
      min-height: 178px;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow);
    }

    .icon {
      width: 42px;
      height: 42px;
      border-radius: 15px;
      display: grid;
      place-items: center;
      margin-bottom: 14px;
      background: #edf7ff;
      color: var(--primary-dark);
      font-weight: 900;
    }

    .service-card h3,
    .step-card h3,
    .guarantee-card h3 {
      margin: 0 0 8px;
      font-size: 18px;
      color: #172a3d;
    }

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

    .solution-wrap {
      display: grid;
      grid-template-columns: 0.86fr 1.14fr;
      gap: 18px;
      align-items: stretch;
    }

    .answer-card {
      padding: 26px;
      background: linear-gradient(150deg, #ffffff, #edf7ff);
    }

    .answer-card strong {
      display: block;
      color: var(--primary-dark);
      font-size: 20px;
      margin-bottom: 12px;
    }

    .answer-card p {
      margin: 0 0 14px;
      color: #43576b;
    }

    .answer-list {
      margin: 18px 0 0;
      padding: 0;
      list-style: none;
      display: grid;
      gap: 11px;
    }

    .answer-list li {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      padding: 10px 12px;
      border-radius: 16px;
      background: rgba(255, 255, 255, 0.74);
      border: 1px solid rgba(220, 232, 242, 0.9);
      color: #384c5f;
      font-size: 14px;
    }

    .answer-list li::before {
      content: "✓";
      flex: 0 0 auto;
      width: 20px;
      height: 20px;
      border-radius: 50%;
      display: grid;
      place-items: center;
      background: rgba(43, 138, 111, 0.12);
      color: var(--green);
      font-size: 12px;
      font-weight: 900;
      margin-top: 2px;
    }

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

    .step-card {
      padding: 22px;
    }

    .step-num {
      width: 32px;
      height: 32px;
      border-radius: 12px;
      display: grid;
      place-items: center;
      background: #fff5e4;
      color: #a06000;
      font-weight: 900;
      margin-bottom: 14px;
    }

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

    .guarantee-card {
      padding: 22px;
      background: rgba(255, 255, 255, 0.84);
    }

    .policy-list {
      margin: 18px 0 0;
      padding: 0;
      list-style: none;
      display: grid;
      gap: 10px;
    }

    .policy-list li {
      padding: 12px 14px;
      border-radius: 16px;
      background: #f8fbfe;
      border: 1px solid var(--line);
      color: #45586b;
      font-size: 14px;
    }

    .contact-panel {
      display: grid;
      grid-template-columns: 1fr 340px;
      gap: 18px;
      align-items: stretch;
      padding: 18px;
      background:
        linear-gradient(135deg, rgba(255,255,255,0.9), rgba(238,247,255,0.9)),
        radial-gradient(circle at 15% 20%, rgba(105,183,255,0.25), transparent 34%);
    }

    .contact-info {
      padding: 12px;
    }

    .info-list {
      display: grid;
      gap: 12px;
      margin-top: 18px;
    }

    .info-item {
      display: grid;
      grid-template-columns: 94px 1fr;
      gap: 12px;
      padding: 14px;
      border: 1px solid rgba(220, 232, 242, 0.95);
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.72);
    }

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

    .info-item strong,
    .info-item a {
      color: #19314a;
      font-weight: 800;
      word-break: break-word;
    }

    .qr-card {
      padding: 18px;
      border-radius: 22px;
      background: #ffffff;
      border: 1px solid rgba(220, 232, 242, 0.95);
      box-shadow: 0 14px 34px rgba(45, 96, 145, 0.1);
      align-self: start;
    }

    .qr-card img {
      width: 100%;
      max-width: 260px;
      margin: 0 auto;
      border-radius: 18px;
      border: 1px solid var(--line);
      background: #ffffff;
    }

    .qr-card h3 {
      margin: 14px 0 6px;
      font-size: 18px;
      text-align: center;
    }

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

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

    .faq-item {
      border: 1px solid rgba(220, 232, 242, 0.95);
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.86);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      border: 0;
      background: transparent;
      color: #18304a;
      padding: 18px 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      font-size: 16px;
      font-weight: 800;
      text-align: left;
      cursor: pointer;
    }

    .faq-question span:last-child {
      flex: 0 0 auto;
      width: 28px;
      height: 28px;
      border-radius: 50%;
      display: grid;
      place-items: center;
      color: var(--primary-dark);
      background: #eef7ff;
      transition: transform 0.2s ease;
    }

    .faq-answer {
      display: none;
      padding: 0 20px 18px;
      color: var(--muted);
      font-size: 14px;
    }

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

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

    .related {
      padding-bottom: 34px;
    }

    .related-panel {
      padding: 22px;
    }

    .related-links {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 10px 16px;
      margin: 14px 0 0;
      padding: 0;
      list-style: none;
    }

    .related-links a {
      display: block;
      padding: 10px 12px;
      border-radius: 14px;
      background: #f8fbfe;
      color: #24445f;
      border: 1px solid rgba(220, 232, 242, 0.86);
      font-size: 14px;
      transition: background 0.18s ease, transform 0.18s ease;
    }

    .related-links a:hover {
      background: #eef7ff;
      transform: translateX(2px);
    }

    .footer {
      background: #eaf4fc;
      border-top: 1px solid #d8e8f4;
      color: #203448;
      padding: 24px 0;
    }

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

    .footer p {
      margin: 0;
      color: #506579;
      font-size: 13px;
    }

    .footer-links {
      display: flex;
      gap: 14px;
      flex-wrap: wrap;
      font-size: 13px;
    }

    .footer-links a {
      color: #234a72;
      font-weight: 700;
    }

    .reveal {
      opacity: 0;
      transform: translateY(16px);
      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: 980px) {
      .nav-links,
      .nav-call {
        display: none;
      }

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

      .mobile-menu {
        display: none;
        padding: 0 0 16px;
      }

      .mobile-menu.open {
        display: grid;
        gap: 8px;
      }

      .mobile-menu a {
        padding: 12px 14px;
        border-radius: 14px;
        background: #ffffff;
        border: 1px solid var(--line);
        color: #24384d;
        font-weight: 700;
      }

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

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

      .contact-panel {
        padding: 16px;
      }
    }

    @media (min-width: 981px) {
      .mobile-menu {
        display: none;
      }
    }

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

      .hero {
        padding-top: 34px;
      }

      section {
        padding: 28px 0;
      }

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

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

      .diagnose-pill {
        position: static;
        max-width: none;
        margin-top: 14px;
      }

      .service-grid,
      .steps,
      .guarantee-grid,
      .related-links {
        grid-template-columns: 1fr;
      }

      .info-item {
        grid-template-columns: 1fr;
        gap: 4px;
      }

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