:root {
      --bg: #eef7fb;
      --bg-soft: #f8fcfe;
      --card: rgba(255, 255, 255, 0.86);
      --card-solid: #ffffff;
      --text: #172533;
      --muted: #5d7082;
      --line: rgba(89, 151, 184, 0.2);
      --primary: #157da8;
      --primary-dark: #0c5f84;
      --primary-soft: #dff3fb;
      --ice: #bfefff;
      --shadow: 0 18px 50px rgba(31, 98, 133, 0.14);
      --radius-xl: 28px;
      --radius-lg: 22px;
      --radius-md: 16px;
      --container: 1120px;
    }

    * {
      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(164, 229, 255, 0.58), transparent 34%),
        radial-gradient(circle at 88% 14%, rgba(209, 245, 255, 0.72), transparent 30%),
        linear-gradient(180deg, #eff9fd 0%, #f9fdff 48%, #eef7fb 100%);
      line-height: 1.7;
      overflow-x: hidden;
    }

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

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

    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(248, 253, 255, 0.86);
      backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(125, 188, 214, 0.22);
    }

    .nav {
      min-height: 70px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      letter-spacing: 0.04em;
      color: #0d3448;
      white-space: nowrap;
    }

    .brand-mark {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      border-radius: 14px;
      background: linear-gradient(145deg, #ffffff 0%, #d8f6ff 100%);
      color: var(--primary-dark);
      box-shadow: inset 0 0 0 1px rgba(39, 144, 183, 0.16), 0 12px 24px rgba(45, 131, 166, 0.16);
      font-size: 22px;
    }

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

    .nav-links a {
      padding: 9px 12px;
      border-radius: 999px;
      color: #315066;
      font-size: 14px;
      transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
    }

    .nav-links a:hover {
      background: rgba(209, 244, 255, 0.72);
      color: var(--primary-dark);
      transform: translateY(-1px);
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 16px;
      border-radius: 999px;
      background: #0d6f98;
      color: #ffffff;
      font-weight: 700;
      font-size: 14px;
      box-shadow: 0 12px 24px rgba(13, 111, 152, 0.22);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      white-space: nowrap;
    }

    .nav-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 16px 30px rgba(13, 111, 152, 0.28);
    }

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

    main {
      position: relative;
    }

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

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.08fr) minmax(280px, 0.92fr);
      gap: 28px;
      align-items: stretch;
    }

    .hero-copy {
      padding: 34px;
      border-radius: var(--radius-xl);
      background: linear-gradient(145deg, rgba(255, 255, 255, 0.9), rgba(228, 248, 255, 0.78));
      border: 1px solid rgba(98, 174, 207, 0.22);
      box-shadow: var(--shadow);
      overflow: hidden;
      position: relative;
    }

    .hero-copy::after {
      content: "";
      position: absolute;
      width: 190px;
      height: 190px;
      right: -76px;
      top: -88px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(112, 212, 247, 0.28), transparent 70%);
      pointer-events: none;
      animation: floatGlow 8s ease-in-out infinite;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      border-radius: 999px;
      background: rgba(223, 243, 251, 0.96);
      color: #17637f;
      font-size: 13px;
      font-weight: 700;
      border: 1px solid rgba(87, 169, 203, 0.2);
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #2bb9e6;
      box-shadow: 0 0 0 5px rgba(43, 185, 230, 0.14);
    }

    h1 {
      margin: 18px 0 14px;
      font-size: clamp(32px, 5vw, 56px);
      line-height: 1.08;
      letter-spacing: -0.04em;
      color: #102b3e;
    }

    .hero-copy p {
      margin: 0;
      max-width: 680px;
      color: #486174;
      font-size: 17px;
    }

    .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;
      border: 1px solid transparent;
      font-weight: 800;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    }

    .btn-primary {
      background: linear-gradient(135deg, #0a6f9a, #18a4cd);
      color: #ffffff;
      box-shadow: 0 14px 26px rgba(24, 132, 174, 0.25);
    }

    .btn-secondary {
      background: rgba(255, 255, 255, 0.82);
      color: #0f5575;
      border-color: rgba(81, 157, 190, 0.28);
    }

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

    .hero-panel {
      border-radius: var(--radius-xl);
      background: rgba(255, 255, 255, 0.72);
      border: 1px solid rgba(105, 178, 210, 0.24);
      box-shadow: var(--shadow);
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .assurance-card {
      padding: 20px;
      border-radius: 22px;
      background:
        linear-gradient(180deg, rgba(245, 253, 255, 0.96), rgba(229, 247, 253, 0.86));
      border: 1px solid rgba(92, 171, 205, 0.22);
    }

    .assurance-card h2 {
      margin: 0 0 8px;
      font-size: 22px;
      color: #123246;
    }

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

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

    .quick-list li {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      padding: 12px;
      border-radius: 16px;
      background: rgba(255, 255, 255, 0.74);
      color: #375469;
      border: 1px solid rgba(118, 185, 214, 0.18);
    }

    .quick-list li::before {
      content: "✓";
      flex: 0 0 auto;
      width: 22px;
      height: 22px;
      display: grid;
      place-items: center;
      border-radius: 50%;
      background: #dbf5fd;
      color: #0b7098;
      font-weight: 900;
      margin-top: 2px;
    }

    .section {
      padding: 36px 0;
    }

    .section-head {
      max-width: 760px;
      margin-bottom: 22px;
    }

    .section-kicker {
      margin: 0 0 8px;
      color: var(--primary);
      font-weight: 800;
      font-size: 14px;
      letter-spacing: 0.06em;
    }

    h2 {
      margin: 0;
      color: #132d40;
      font-size: clamp(25px, 3.3vw, 38px);
      line-height: 1.2;
      letter-spacing: -0.02em;
    }

    .section-head p {
      margin: 12px 0 0;
      color: var(--muted);
      font-size: 16px;
    }

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

    .service-card {
      padding: 22px;
      min-height: 184px;
      border-radius: var(--radius-lg);
      background: var(--card);
      border: 1px solid var(--line);
      box-shadow: 0 12px 32px rgba(54, 132, 168, 0.09);
      transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 42px rgba(54, 132, 168, 0.15);
      border-color: rgba(39, 151, 194, 0.32);
    }

    .icon {
      width: 40px;
      height: 40px;
      display: grid;
      place-items: center;
      border-radius: 14px;
      background: linear-gradient(145deg, #e2f7ff, #ffffff);
      color: var(--primary-dark);
      font-weight: 900;
      margin-bottom: 14px;
      border: 1px solid rgba(75, 163, 199, 0.2);
    }

    .service-card h3 {
      margin: 0 0 8px;
      font-size: 19px;
      color: #183346;
    }

    .service-card p {
      margin: 0;
      color: #607385;
      font-size: 15px;
    }

    .split {
      display: grid;
      grid-template-columns: 0.92fr 1.08fr;
      gap: 18px;
      align-items: start;
    }

    .glass-box {
      border-radius: var(--radius-xl);
      background: rgba(255, 255, 255, 0.78);
      border: 1px solid var(--line);
      box-shadow: 0 14px 38px rgba(44, 119, 156, 0.1);
      padding: 26px;
    }

    .steps {
      display: grid;
      gap: 14px;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .step {
      display: grid;
      grid-template-columns: 46px 1fr;
      gap: 14px;
      align-items: start;
      padding: 16px;
      border-radius: 18px;
      background: rgba(241, 250, 253, 0.9);
      border: 1px solid rgba(114, 184, 214, 0.16);
    }

    .step-num {
      width: 46px;
      height: 46px;
      display: grid;
      place-items: center;
      border-radius: 16px;
      background: #ffffff;
      color: var(--primary-dark);
      font-weight: 900;
      box-shadow: inset 0 0 0 1px rgba(82, 160, 194, 0.18);
    }

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

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

    .warranty-table {
      overflow: hidden;
      border-radius: 22px;
      border: 1px solid var(--line);
      background: rgba(255, 255, 255, 0.86);
    }

    .warranty-row {
      display: grid;
      grid-template-columns: 1fr 1fr 1.4fr;
      gap: 0;
      border-bottom: 1px solid rgba(104, 174, 206, 0.16);
    }

    .warranty-row:last-child {
      border-bottom: 0;
    }

    .warranty-row strong,
    .warranty-row span {
      padding: 16px;
      color: #2a4356;
    }

    .warranty-row strong {
      color: #123246;
      background: rgba(222, 245, 253, 0.64);
    }

    .warranty-row.header strong {
      background: #dff3fb;
      color: #0e506d;
      font-size: 14px;
    }

    .notice {
      margin-top: 14px;
      padding: 16px;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.78);
      border: 1px dashed rgba(45, 143, 184, 0.38);
      color: #4d6476;
      font-size: 15px;
    }

    .contact-wrap {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
      align-items: stretch;
    }

    .contact-card {
      padding: 26px;
      border-radius: var(--radius-xl);
      background:
        linear-gradient(145deg, rgba(255, 255, 255, 0.92), rgba(232, 249, 255, 0.82));
      border: 1px solid var(--line);
      box-shadow: 0 16px 40px rgba(41, 125, 163, 0.12);
    }

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

    .contact-list li {
      padding: 13px 14px;
      border-radius: 16px;
      background: rgba(255, 255, 255, 0.72);
      border: 1px solid rgba(117, 183, 211, 0.18);
      color: #3c5568;
    }

    .link-panel {
      padding: 22px;
      border-radius: var(--radius-xl);
      background: rgba(255, 255, 255, 0.7);
      border: 1px solid var(--line);
    }

    .link-panel h3 {
      margin: 0 0 12px;
      font-size: 20px;
      color: #142f43;
    }

    .related-links {
      display: grid;
      gap: 10px;
    }

    .related-links a {
      display: block;
      padding: 13px 14px;
      border-radius: 15px;
      background: rgba(241, 250, 253, 0.86);
      color: #23536c;
      border: 1px solid rgba(112, 183, 213, 0.18);
      transition: transform 0.2s ease, background 0.2s ease;
    }

    .related-links a:hover {
      transform: translateX(4px);
      background: #ffffff;
    }

    .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;
      box-shadow: 0 10px 26px rgba(58, 137, 172, 0.08);
    }

    .faq-question {
      width: 100%;
      border: 0;
      background: transparent;
      color: #17364a;
      padding: 18px 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 14px;
      text-align: left;
      cursor: pointer;
      font-size: 16px;
      font-weight: 800;
      font-family: inherit;
    }

    .faq-question span:last-child {
      width: 28px;
      height: 28px;
      flex: 0 0 auto;
      display: grid;
      place-items: center;
      border-radius: 50%;
      background: #e1f5fc;
      color: var(--primary-dark);
      transition: transform 0.2s ease;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.24s ease;
    }

    .faq-answer p {
      margin: 0;
      padding: 0 20px 18px;
      color: var(--muted);
    }

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

    .cta-band {
      margin: 34px 0 0;
      padding: 26px;
      border-radius: var(--radius-xl);
      background:
        linear-gradient(135deg, rgba(13, 111, 152, 0.94), rgba(34, 168, 205, 0.9)),
        radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.28), transparent 30%);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      box-shadow: 0 20px 42px rgba(13, 111, 152, 0.22);
    }

    .cta-band h2 {
      color: #ffffff;
      font-size: clamp(22px, 3vw, 32px);
    }

    .cta-band p {
      margin: 8px 0 0;
      color: rgba(255, 255, 255, 0.86);
    }

    .cta-band .btn {
      background: #ffffff;
      color: #0c5f84;
      flex: 0 0 auto;
    }

    .site-footer {
      margin-top: 34px;
      background: #e2f2f8;
      color: #213c50;
      border-top: 1px solid rgba(95, 164, 194, 0.24);
    }

    .footer-inner {
      padding: 24px 0;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
    }

    .footer-inner p {
      margin: 0;
      color: #4d6476;
      font-size: 14px;
    }

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

    .footer-links a {
      color: #185a78;
      font-size: 14px;
      font-weight: 700;
    }

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

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

    @keyframes floatGlow {
      0%, 100% {
        transform: translate3d(0, 0, 0) scale(1);
      }
      50% {
        transform: translate3d(-12px, 18px, 0) scale(1.08);
      }
    }

    @media (max-width: 920px) {
      .menu-toggle {
        display: grid;
        place-items: center;
      }

      .nav-links,
      .nav-cta {
        display: none;
      }

      .nav-links.open {
        position: absolute;
        left: 18px;
        right: 18px;
        top: 70px;
        display: grid;
        gap: 6px;
        padding: 12px;
        border-radius: 20px;
        background: rgba(255, 255, 255, 0.96);
        border: 1px solid var(--line);
        box-shadow: var(--shadow);
      }

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

      .hero-grid,
      .split,
      .contact-wrap {
        grid-template-columns: 1fr;
      }

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

      .cta-band {
        align-items: flex-start;
        flex-direction: column;
      }
    }

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

      .hero {
        padding-top: 34px;
      }

      .hero-copy,
      .hero-panel,
      .glass-box,
      .contact-card,
      .link-panel {
        padding: 20px;
        border-radius: 22px;
      }

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

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

      .warranty-row.header {
        display: none;
      }

      .warranty-row strong,
      .warranty-row span {
        padding: 12px 14px;
      }

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