:root {
      --bg: #f5f9fc;
      --bg-ice: #eaf5fb;
      --card: #ffffff;
      --text: #102536;
      --muted: #5d7180;
      --line: #d9e8f0;
      --blue: #1278b8;
      --blue-deep: #075b91;
      --cyan: #62c7e7;
      --ice: #f8fcff;
      --shadow: 0 18px 45px rgba(13, 72, 111, 0.12);
      --radius: 22px;
      --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 12% 8%, rgba(98, 199, 231, 0.28), transparent 30%),
        radial-gradient(circle at 88% 12%, rgba(18, 120, 184, 0.18), transparent 28%),
        linear-gradient(180deg, #f8fcff 0%, #eef7fb 44%, #f8fbfd 100%);
      line-height: 1.7;
      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(248, 252, 255, 0.86);
      backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(217, 232, 240, 0.78);
    }

    .nav {
      min-height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      font-weight: 800;
      color: var(--text);
      white-space: nowrap;
    }

    .brand-mark {
      width: 42px;
      height: 42px;
      border-radius: 14px;
      display: grid;
      place-items: center;
      color: #ffffff;
      font-size: 24px;
      font-weight: 900;
      background: linear-gradient(135deg, var(--blue-deep), var(--cyan));
      box-shadow: 0 10px 24px rgba(18, 120, 184, 0.25);
    }

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

    .brand-text strong {
      font-size: 17px;
    }

    .brand-text span {
      font-size: 12px;
      color: var(--muted);
      font-weight: 600;
    }

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

    .nav-links a {
      padding: 10px 12px;
      border-radius: 999px;
      font-size: 14px;
      color: #2b4758;
      transition: background 0.2s ease, color 0.2s ease;
    }

    .nav-links a:hover {
      background: #e3f3fb;
      color: var(--blue-deep);
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 42px;
      padding: 0 18px;
      border-radius: 999px;
      background: linear-gradient(135deg, var(--blue), var(--blue-deep));
      color: #ffffff;
      font-weight: 700;
      box-shadow: 0 12px 24px rgba(18, 120, 184, 0.22);
    }

    .menu-btn {
      display: none;
      width: 44px;
      height: 44px;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: #ffffff;
      color: var(--text);
      font-size: 22px;
      cursor: pointer;
    }

    main {
      position: relative;
    }

    section {
      padding: 56px 0;
    }

    .hero {
      padding: 66px 0 46px;
    }

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

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      border: 1px solid rgba(18, 120, 184, 0.18);
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.72);
      color: var(--blue-deep);
      font-size: 13px;
      font-weight: 700;
      box-shadow: 0 8px 20px rgba(13, 72, 111, 0.06);
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--cyan);
      box-shadow: 0 0 0 5px rgba(98, 199, 231, 0.18);
    }

    h1 {
      margin: 18px 0 16px;
      font-size: clamp(34px, 6vw, 58px);
      line-height: 1.08;
      letter-spacing: -1.5px;
      color: #0a2638;
    }

    .hero-lead {
      margin: 0;
      max-width: 680px;
      color: #405b6b;
      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: 48px;
      padding: 0 20px;
      border-radius: 14px;
      font-weight: 800;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    }

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

    .btn-primary {
      color: #ffffff;
      background: linear-gradient(135deg, #0f85c8, #075b91);
      box-shadow: 0 16px 28px rgba(18, 120, 184, 0.26);
    }

    .btn-secondary {
      color: var(--blue-deep);
      background: #ffffff;
      border: 1px solid var(--line);
      box-shadow: 0 12px 24px rgba(13, 72, 111, 0.08);
    }

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

    .note-item {
      padding: 14px;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.72);
      border: 1px solid rgba(217, 232, 240, 0.75);
    }

    .note-item strong {
      display: block;
      color: #0a3149;
      font-size: 15px;
    }

    .note-item span {
      display: block;
      margin-top: 3px;
      color: var(--muted);
      font-size: 13px;
      line-height: 1.5;
    }

    .visual-card {
      position: relative;
      padding: 16px;
      border-radius: 30px;
      background: linear-gradient(145deg, rgba(255, 255, 255, 0.82), rgba(232, 246, 253, 0.82));
      border: 1px solid rgba(255, 255, 255, 0.92);
      box-shadow: var(--shadow);
      overflow: hidden;
    }

    .visual-card::before {
      content: "";
      position: absolute;
      inset: 18px;
      border-radius: 24px;
      border: 1px solid rgba(98, 199, 231, 0.32);
      pointer-events: none;
    }

    .phone-wrap {
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      background: #dceff7;
      aspect-ratio: 4 / 3;
      display: grid;
      place-items: center;
    }

    .phone-wrap img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      padding: 12px;
    }

    .ice-badge {
      position: absolute;
      right: 24px;
      bottom: 24px;
      max-width: 230px;
      padding: 14px 16px;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.9);
      border: 1px solid rgba(217, 232, 240, 0.92);
      box-shadow: 0 16px 34px rgba(13, 72, 111, 0.14);
    }

    .ice-badge strong {
      display: block;
      color: var(--blue-deep);
      font-size: 15px;
    }

    .ice-badge span {
      display: block;
      margin-top: 4px;
      color: var(--muted);
      font-size: 13px;
      line-height: 1.5;
    }

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

    .section-head h2 {
      margin: 0;
      color: #0a2638;
      font-size: clamp(25px, 3.4vw, 38px);
      line-height: 1.18;
      letter-spacing: -0.6px;
    }

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

    .panel {
      background: rgba(255, 255, 255, 0.76);
      border: 1px solid rgba(217, 232, 240, 0.88);
      border-radius: var(--radius);
      box-shadow: 0 14px 34px rgba(13, 72, 111, 0.08);
    }

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

    .service-card {
      padding: 22px;
      min-height: 160px;
      transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
    }

    .service-card:hover {
      transform: translateY(-4px);
      border-color: rgba(18, 120, 184, 0.32);
      box-shadow: 0 20px 42px rgba(13, 72, 111, 0.12);
    }

    .service-icon {
      width: 42px;
      height: 42px;
      border-radius: 15px;
      display: grid;
      place-items: center;
      margin-bottom: 14px;
      color: var(--blue-deep);
      background: linear-gradient(135deg, #e2f5fc, #ffffff);
      border: 1px solid #d6edf7;
      font-weight: 900;
    }

    .service-card h3 {
      margin: 0 0 8px;
      font-size: 18px;
      color: #123145;
    }

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

    .solution-layout {
      display: grid;
      grid-template-columns: 0.85fr 1.15fr;
      gap: 18px;
      align-items: stretch;
    }

    .solution-main {
      padding: 26px;
      background: linear-gradient(160deg, #ffffff, #e9f7fd);
      border-radius: var(--radius);
      border: 1px solid rgba(217, 232, 240, 0.9);
      box-shadow: var(--shadow);
    }

    .solution-main h2 {
      margin: 0 0 12px;
      font-size: clamp(24px, 3vw, 34px);
      line-height: 1.2;
    }

    .solution-main p {
      margin: 0 0 18px;
      color: var(--muted);
    }

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

    .check-list li {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      color: #284758;
    }

    .check-list li::before {
      content: "✓";
      flex: 0 0 24px;
      width: 24px;
      height: 24px;
      border-radius: 50%;
      display: grid;
      place-items: center;
      background: #dff4fb;
      color: var(--blue-deep);
      font-weight: 900;
      line-height: 1;
      margin-top: 2px;
    }

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

    .step {
      display: grid;
      grid-template-columns: auto 1fr;
      gap: 14px;
      padding: 18px;
      border-radius: 20px;
      background: #ffffff;
      border: 1px solid var(--line);
    }

    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 13px;
      display: grid;
      place-items: center;
      background: #0f78b3;
      color: #ffffff;
      font-weight: 900;
    }

    .step h3 {
      margin: 0 0 4px;
      font-size: 17px;
    }

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

    .warranty-wrap {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
    }

    .warranty-card {
      padding: 24px;
      border-radius: var(--radius);
      background: #ffffff;
      border: 1px solid var(--line);
      box-shadow: 0 12px 30px rgba(13, 72, 111, 0.07);
    }

    .warranty-card.primary {
      background: linear-gradient(135deg, #0f7dbb, #074f80);
      color: #ffffff;
      border-color: transparent;
    }

    .warranty-card h3 {
      margin: 0 0 10px;
      font-size: 22px;
    }

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

    .warranty-card.primary p {
      color: rgba(255, 255, 255, 0.88);
    }

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

    .warranty-row {
      display: grid;
      grid-template-columns: 118px 1fr;
      gap: 12px;
      padding: 13px 0;
      border-top: 1px solid rgba(217, 232, 240, 0.82);
    }

    .warranty-row strong {
      color: #123145;
    }

    .warranty-row span {
      color: var(--muted);
    }

    .contact-grid {
      display: grid;
      grid-template-columns: 1.05fr 0.95fr;
      gap: 18px;
      align-items: stretch;
    }

    .contact-card {
      padding: 26px;
    }

    .contact-lines {
      display: grid;
      gap: 12px;
      margin-top: 18px;
    }

    .contact-line {
      padding: 14px 16px;
      border-radius: 16px;
      background: #f4fafd;
      border: 1px solid var(--line);
      color: #284758;
    }

    .contact-line strong {
      color: #0a3149;
    }

    .qr-grid {
      display: grid;
      grid-template-columns: 150px 1fr;
      gap: 18px;
      align-items: center;
      margin-top: 18px;
      padding: 18px;
      border-radius: 20px;
      background: linear-gradient(135deg, #f8fcff, #e8f6fc);
      border: 1px solid var(--line);
    }

    .qr-box {
      padding: 10px;
      border-radius: 18px;
      background: #ffffff;
      border: 1px solid #d8e9f1;
    }

    .map-link {
      color: #0066cc;
      font-weight: 800;
      text-decoration: none;
    }

    .map-link:hover {
      text-decoration: underline;
    }

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

    .faq-item {
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.82);
      border: 1px solid var(--line);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      min-height: 58px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 0 18px;
      border: 0;
      background: transparent;
      color: var(--text);
      text-align: left;
      font-size: 16px;
      font-weight: 800;
      cursor: pointer;
    }

    .faq-question span {
      color: var(--blue-deep);
      font-size: 22px;
      line-height: 1;
      transition: transform 0.2s ease;
    }

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

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

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

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

    .links-box {
      padding: 22px;
      border-radius: var(--radius);
      background: rgba(255, 255, 255, 0.72);
      border: 1px solid var(--line);
    }

    .links-box h2 {
      margin: 0 0 14px;
      font-size: 22px;
    }

    .friendly-links {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px 16px;
    }

    .friendly-links a {
      color: #28546d;
      font-size: 14px;
      line-height: 1.5;
      padding: 8px 0;
      border-bottom: 1px dashed #d8e8f0;
    }

    .friendly-links a:hover {
      color: var(--blue-deep);
    }

    .site-footer {
      margin-top: 22px;
      padding: 26px 0;
      background: #e9f4fa;
      border-top: 1px solid #d3e6ef;
      color: #18364a;
    }

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

    .footer-inner p {
      margin: 0;
      color: #4f6878;
      font-size: 14px;
    }

    .footer-nav {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .footer-nav a {
      color: #174d70;
      font-size: 14px;
      font-weight: 700;
    }

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

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

    @media (max-width: 980px) {
      .nav-links {
        position: absolute;
        left: 16px;
        right: 16px;
        top: 76px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        padding: 14px;
        border-radius: 20px;
        background: #ffffff;
        border: 1px solid var(--line);
        box-shadow: var(--shadow);
      }

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

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

      .nav-cta {
        width: 100%;
      }

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

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

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

      .section-head {
        align-items: flex-start;
        flex-direction: column;
        gap: 10px;
      }

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

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

      section {
        padding: 42px 0;
      }

      .hero {
        padding-top: 44px;
      }

      .brand-text span {
        display: none;
      }

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

      .ice-badge {
        position: static;
        margin-top: 12px;
        max-width: none;
      }

      .visual-card::before {
        display: none;
      }

      .warranty-row {
        grid-template-columns: 1fr;
        gap: 4px;
      }

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

      .qr-box {
        width: 170px;
      }

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