:root {
      --bg: #f5fbff;
      --bg-soft: #eef8ff;
      --panel: rgba(255, 255, 255, 0.88);
      --panel-solid: #ffffff;
      --text: #13233a;
      --muted: #5a6f89;
      --line: #d8eaf6;
      --primary: #0879d8;
      --primary-deep: #03529e;
      --cyan: #33c6e9;
      --ice: #dff6ff;
      --warm: #f7fbff;
      --shadow: 0 18px 50px rgba(18, 86, 140, 0.13);
      --shadow-soft: 0 12px 28px rgba(18, 86, 140, 0.09);
      --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 10% 6%, rgba(54, 198, 233, 0.22), transparent 28%),
        radial-gradient(circle at 92% 16%, rgba(8, 121, 216, 0.14), transparent 30%),
        linear-gradient(180deg, #f3fbff 0%, #ffffff 48%, #f1f8ff 100%);
      line-height: 1.65;
      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: 50;
      background: rgba(246, 252, 255, 0.82);
      backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(190, 225, 244, 0.75);
    }

    .nav {
      min-height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
    }

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

    .logo-mark {
      width: 44px;
      height: 44px;
      border-radius: 15px;
      display: grid;
      place-items: center;
      color: #ffffff;
      font-size: 24px;
      font-weight: 800;
      background: linear-gradient(135deg, #0a7ee6, #4ad2ec);
      box-shadow: 0 10px 26px rgba(8, 121, 216, 0.24);
    }

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

    .brand-text strong {
      font-size: 17px;
      letter-spacing: 0.02em;
    }

    .brand-text span {
      margin-top: 4px;
      font-size: 12px;
      color: var(--muted);
    }

    .nav-links {
      display: none;
      align-items: center;
      gap: 4px;
    }

    .nav-links a {
      padding: 9px 12px;
      border-radius: 999px;
      color: #28415c;
      font-size: 14px;
      transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
    }

    .nav-links a:hover {
      background: rgba(8, 121, 216, 0.08);
      color: var(--primary-deep);
      transform: translateY(-1px);
    }

    .nav-action {
      display: none;
    }

    .menu-toggle {
      width: 42px;
      height: 42px;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: #ffffff;
      color: var(--text);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      box-shadow: var(--shadow-soft);
    }

    .menu-toggle span,
    .menu-toggle span::before,
    .menu-toggle span::after {
      width: 18px;
      height: 2px;
      border-radius: 2px;
      background: #17415f;
      display: block;
      position: relative;
      transition: transform 0.2s ease, opacity 0.2s ease;
    }

    .menu-toggle span::before,
    .menu-toggle span::after {
      content: "";
      position: absolute;
      left: 0;
    }

    .menu-toggle span::before {
      top: -6px;
    }

    .menu-toggle span::after {
      top: 6px;
    }

    .menu-toggle.is-open span {
      transform: rotate(45deg);
    }

    .menu-toggle.is-open span::before {
      opacity: 0;
    }

    .menu-toggle.is-open span::after {
      transform: rotate(-90deg);
      top: 0;
    }

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

    .mobile-panel.is-open {
      display: block;
    }

    .mobile-panel .panel-inner {
      display: grid;
      gap: 8px;
      padding: 12px;
      border: 1px solid var(--line);
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.94);
      box-shadow: var(--shadow-soft);
    }

    .mobile-panel a {
      padding: 11px 12px;
      border-radius: 12px;
      color: #263d56;
    }

    .mobile-panel a:hover {
      background: var(--bg-soft);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: 0;
      cursor: pointer;
      border-radius: 999px;
      padding: 12px 18px;
      font-weight: 700;
      line-height: 1.2;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--cyan));
      color: #ffffff;
      box-shadow: 0 12px 26px rgba(8, 121, 216, 0.24);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 16px 32px rgba(8, 121, 216, 0.3);
    }

    .btn-ghost {
      color: var(--primary-deep);
      background: rgba(255, 255, 255, 0.8);
      border: 1px solid #bde6f7;
    }

    .btn-ghost:hover {
      transform: translateY(-2px);
      background: #ffffff;
    }

    main {
      position: relative;
    }

    .hero {
      padding: 46px 0 34px;
    }

    .hero-grid {
      display: grid;
      gap: 22px;
      align-items: center;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      width: fit-content;
      padding: 7px 12px;
      border: 1px solid #b8e5f8;
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.78);
      color: #075b9f;
      font-size: 13px;
      font-weight: 700;
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--cyan);
      box-shadow: 0 0 0 5px rgba(51, 198, 233, 0.16);
    }

    h1 {
      margin: 16px 0 14px;
      font-size: clamp(34px, 8vw, 62px);
      line-height: 1.05;
      letter-spacing: -0.05em;
      color: #0d2742;
    }

    .hero-lead {
      margin: 0;
      max-width: 680px;
      color: #3f5975;
      font-size: 17px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 24px;
    }

    .hero-notes {
      display: grid;
      grid-template-columns: 1fr;
      gap: 10px;
      margin-top: 22px;
    }

    .note-chip {
      padding: 12px 14px;
      border: 1px solid rgba(174, 221, 242, 0.9);
      border-radius: 16px;
      background: rgba(255, 255, 255, 0.74);
      color: #27445f;
      font-size: 14px;
    }

    .visual-card {
      position: relative;
      padding: 16px;
      border: 1px solid rgba(180, 226, 246, 0.95);
      border-radius: var(--radius-xl);
      background:
        linear-gradient(145deg, rgba(255, 255, 255, 0.9), rgba(228, 247, 255, 0.75)),
        radial-gradient(circle at 80% 20%, rgba(51, 198, 233, 0.24), transparent 40%);
      box-shadow: var(--shadow);
      overflow: hidden;
      isolation: isolate;
    }

    .visual-card::before {
      content: "";
      position: absolute;
      inset: auto -50px -60px auto;
      width: 190px;
      height: 190px;
      border-radius: 48px;
      background: rgba(8, 121, 216, 0.08);
      transform: rotate(18deg);
      z-index: -1;
      animation: floatIce 7s ease-in-out infinite;
    }

    .phone-showcase {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      align-items: stretch;
    }

    .phone-frame {
      border-radius: 22px;
      padding: 10px;
      background: rgba(255, 255, 255, 0.88);
      border: 1px solid rgba(200, 232, 247, 0.92);
      box-shadow: 0 14px 26px rgba(17, 84, 139, 0.1);
      overflow: hidden;
    }

    .phone-frame img {
      width: 100%;
      aspect-ratio: 4 / 5;
      object-fit: contain;
      border-radius: 16px;
      background: #f7fcff;
    }

    .status-strip {
      display: grid;
      gap: 10px;
      margin-top: 14px;
    }

    .status-item {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      padding: 12px;
      border-radius: 16px;
      background: rgba(242, 250, 255, 0.9);
      border: 1px solid rgba(206, 235, 248, 0.9);
    }

    .status-dot {
      width: 10px;
      height: 10px;
      margin-top: 8px;
      flex: 0 0 auto;
      border-radius: 50%;
      background: var(--primary);
      box-shadow: 0 0 0 5px rgba(8, 121, 216, 0.1);
    }

    .status-item strong {
      display: block;
      font-size: 14px;
      color: #113455;
    }

    .status-item span {
      display: block;
      margin-top: 2px;
      font-size: 13px;
      color: var(--muted);
    }

    section {
      padding: 34px 0;
    }

    .section-head {
      display: grid;
      gap: 10px;
      margin-bottom: 20px;
      max-width: 760px;
    }

    .section-head.center {
      margin-left: auto;
      margin-right: auto;
      text-align: center;
    }

    h2 {
      margin: 0;
      font-size: clamp(26px, 5vw, 40px);
      line-height: 1.18;
      letter-spacing: -0.03em;
      color: #102943;
    }

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

    .service-band {
      border: 1px solid rgba(198, 229, 245, 0.9);
      border-radius: var(--radius-xl);
      background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(236, 249, 255, 0.86));
      box-shadow: var(--shadow-soft);
      overflow: hidden;
    }

    .service-grid {
      display: grid;
      grid-template-columns: 1fr;
    }

    .service-card {
      padding: 20px;
      border-bottom: 1px solid var(--line);
    }

    .service-card:last-child {
      border-bottom: 0;
    }

    .service-icon {
      width: 42px;
      height: 42px;
      border-radius: 15px;
      display: grid;
      place-items: center;
      margin-bottom: 12px;
      color: #ffffff;
      font-weight: 800;
      background: linear-gradient(135deg, #0879d8, #47cce8);
    }

    .service-card h3,
    .solution-card h3,
    .warranty-card h3,
    .contact-card h3 {
      margin: 0 0 8px;
      font-size: 18px;
      color: #122e4b;
    }

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

    .solution-layout {
      display: grid;
      gap: 16px;
    }

    .solution-card {
      padding: 22px;
      border: 1px solid rgba(197, 229, 245, 0.95);
      border-radius: var(--radius-lg);
      background: rgba(255, 255, 255, 0.86);
      box-shadow: var(--shadow-soft);
      transition: transform 0.22s ease, box-shadow 0.22s ease;
    }

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

    .step-list {
      counter-reset: step;
      display: grid;
      gap: 12px;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .step-list li {
      counter-increment: step;
      display: grid;
      grid-template-columns: 38px 1fr;
      gap: 12px;
      align-items: start;
      padding: 15px;
      border-radius: 18px;
      background: linear-gradient(135deg, #ffffff, #eff9ff);
      border: 1px solid var(--line);
    }

    .step-list li::before {
      content: counter(step);
      width: 34px;
      height: 34px;
      display: grid;
      place-items: center;
      border-radius: 12px;
      color: #ffffff;
      font-weight: 800;
      background: #0a7ee6;
    }

    .step-list strong {
      display: block;
      margin-bottom: 4px;
      color: #14314e;
    }

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

    .warranty-grid {
      display: grid;
      gap: 14px;
    }

    .warranty-card {
      padding: 18px;
      border: 1px solid rgba(197, 229, 245, 0.95);
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.88);
    }

    .warranty-card strong {
      display: inline-flex;
      margin-bottom: 6px;
      color: #075b9f;
    }

    .contact-wrap {
      display: grid;
      gap: 16px;
      align-items: stretch;
    }

    .contact-card {
      padding: 22px;
      border-radius: var(--radius-xl);
      border: 1px solid rgba(191, 226, 244, 0.95);
      background: rgba(255, 255, 255, 0.9);
      box-shadow: var(--shadow-soft);
    }

    .contact-list {
      display: grid;
      gap: 12px;
      margin: 16px 0 0;
      padding: 0;
      list-style: none;
    }

    .contact-list li {
      padding: 12px 14px;
      border-radius: 15px;
      background: #f2faff;
      border: 1px solid #d8edf8;
      color: #233d58;
    }

    .contact-list strong {
      display: block;
      margin-bottom: 2px;
      color: #0e3151;
    }

    .qr-box {
      display: grid;
      gap: 14px;
    }

    .qr-image {
      padding: 14px;
      border-radius: 22px;
      border: 1px solid #cceafa;
      background: #ffffff;
    }

    .qr-image img {
      width: min(100%, 260px);
      margin: 0 auto;
      border-radius: 14px;
      object-fit: contain;
    }

    .map-link {
      display: inline-flex;
      width: fit-content;
      align-items: center;
      justify-content: center;
      padding: 11px 15px;
      border-radius: 999px;
      color: #065da7;
      background: #e9f8ff;
      border: 1px solid #bee8f8;
      font-weight: 700;
    }

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

    .faq-item {
      border: 1px solid rgba(197, 229, 245, 0.95);
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.9);
      overflow: hidden;
      box-shadow: 0 8px 18px rgba(18, 86, 140, 0.06);
    }

    .faq-question {
      width: 100%;
      border: 0;
      background: transparent;
      color: #102943;
      text-align: left;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
      padding: 17px 18px;
      cursor: pointer;
      font-size: 16px;
      font-weight: 800;
    }

    .faq-question span:last-child {
      width: 24px;
      height: 24px;
      flex: 0 0 auto;
      display: grid;
      place-items: center;
      border-radius: 50%;
      color: #ffffff;
      background: var(--primary);
      transition: transform 0.2s ease;
    }

    .faq-answer {
      display: none;
      padding: 0 18px 17px;
      color: var(--muted);
    }

    .faq-item.is-open .faq-answer {
      display: block;
    }

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

    .links-panel {
      padding: 22px;
      border-radius: var(--radius-xl);
      background:
        linear-gradient(135deg, rgba(237, 249, 255, 0.95), rgba(255, 255, 255, 0.92));
      border: 1px solid rgba(198, 229, 245, 0.95);
      box-shadow: var(--shadow-soft);
    }

    .link-grid {
      display: grid;
      gap: 10px;
      margin-top: 14px;
    }

    .link-grid a {
      padding: 12px 14px;
      border-radius: 14px;
      background: #ffffff;
      border: 1px solid #d7edf8;
      color: #24506f;
      transition: color 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
    }

    .link-grid a:hover {
      color: var(--primary-deep);
      border-color: #9cdef5;
      transform: translateY(-2px);
    }

    .site-footer {
      margin-top: 10px;
      padding: 26px 0;
      background: #082f55;
      color: #eaf7ff;
    }

    .footer-inner {
      display: grid;
      gap: 14px;
      align-items: center;
    }

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

    .footer-logo {
      width: 38px;
      height: 38px;
      border-radius: 13px;
      display: grid;
      place-items: center;
      color: #083255;
      background: #dff6ff;
      font-size: 22px;
      font-weight: 800;
    }

    .footer-inner p {
      margin: 0;
      color: #cae4f2;
      font-size: 14px;
    }

    .footer-links {
      display: flex;
      flex-wrap: wrap;
      gap: 10px 16px;
    }

    .footer-links a {
      color: #eaf7ff;
      font-size: 14px;
    }

    .footer-links a:hover {
      color: #7de4ff;
    }

    .back-top {
      position: fixed;
      right: 18px;
      bottom: 18px;
      z-index: 30;
      width: 44px;
      height: 44px;
      border: 0;
      border-radius: 16px;
      display: none;
      place-items: center;
      color: #ffffff;
      background: linear-gradient(135deg, var(--primary), var(--cyan));
      box-shadow: 0 12px 26px rgba(8, 121, 216, 0.28);
      cursor: pointer;
    }

    .back-top.is-visible {
      display: grid;
    }

    .reveal {
      opacity: 0;
      transform: translateY(18px);
      transition: opacity 0.65s ease, transform 0.65s ease;
    }

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

    @keyframes floatIce {
      0%, 100% {
        transform: translateY(0) rotate(18deg);
      }
      50% {
        transform: translateY(-12px) rotate(22deg);
      }
    }

    @media (min-width: 640px) {
      .hero-notes {
        grid-template-columns: repeat(3, 1fr);
      }

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

      .service-card {
        border-right: 1px solid var(--line);
      }

      .service-card:nth-child(2n) {
        border-right: 0;
      }

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

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

    @media (min-width: 900px) {
      .menu-toggle {
        display: none;
      }

      .nav-links,
      .nav-action {
        display: flex;
      }

      .hero {
        padding: 64px 0 42px;
      }

      .hero-grid {
        grid-template-columns: minmax(0, 1.05fr) minmax(340px, 0.95fr);
        gap: 36px;
      }

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

      .solution-layout {
        grid-template-columns: 0.85fr 1.15fr;
      }

      .contact-wrap {
        grid-template-columns: 1.05fr 0.95fr;
      }

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

    @media (min-width: 1080px) {
      .service-grid {
        grid-template-columns: repeat(4, 1fr);
      }

      .service-card {
        border-bottom: 1px solid var(--line);
      }

      .service-card:nth-child(2n) {
        border-right: 1px solid var(--line);
      }

      .service-card:nth-child(4n) {
        border-right: 0;
      }

      .service-card:nth-last-child(-n + 4) {
        border-bottom: 0;
      }

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

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