:root {
      --bg: #f6f3ea;
      --bg-soft: #fbfaf6;
      --card: #ffffff;
      --celadon: #7fa99b;
      --celadon-deep: #3f7468;
      --celadon-light: #dbe9e2;
      --ink: #263733;
      --muted: #66736f;
      --line: rgba(63, 116, 104, 0.18);
      --warm: #b99565;
      --shadow: 0 18px 48px rgba(44, 76, 69, 0.10);
      --radius-xl: 28px;
      --radius-lg: 20px;
      --radius-md: 14px;
      --container: 1120px;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      color: var(--ink);
      background:
        radial-gradient(circle at 12% 8%, rgba(127, 169, 155, 0.20), transparent 28%),
        radial-gradient(circle at 88% 12%, rgba(185, 149, 101, 0.14), transparent 26%),
        linear-gradient(180deg, #f4f0e6 0%, #f8f6ef 45%, #eef5f0 100%);
      line-height: 1.72;
      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, 243, 234, 0.86);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--line);
    }

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

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

    .logo-mark {
      width: 42px;
      height: 42px;
      border-radius: 16px;
      display: grid;
      place-items: center;
      color: #ffffff;
      background: linear-gradient(135deg, var(--celadon-deep), var(--celadon));
      font-weight: 800;
      font-size: 22px;
      box-shadow: 0 10px 24px rgba(63, 116, 104, 0.24);
    }

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

    .brand-text strong {
      font-size: 16px;
      letter-spacing: 0.04em;
    }

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

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

    .nav-links a {
      padding: 10px 13px;
      border-radius: 999px;
      color: #334641;
      font-size: 14px;
      transition: background 0.25s ease, color 0.25s ease, transform 0.25s ease;
    }

    .nav-links a:hover {
      background: rgba(127, 169, 155, 0.16);
      color: var(--celadon-deep);
      transform: translateY(-1px);
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 16px;
      border-radius: 999px;
      color: #ffffff;
      background: var(--celadon-deep);
      font-size: 14px;
      box-shadow: 0 12px 28px rgba(63, 116, 104, 0.20);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }

    .nav-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 16px 34px rgba(63, 116, 104, 0.28);
    }

    .menu-toggle {
      display: none;
      width: 42px;
      height: 42px;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: rgba(255, 255, 255, 0.72);
      color: var(--ink);
      cursor: pointer;
      align-items: center;
      justify-content: center;
    }

    .menu-toggle span {
      width: 18px;
      height: 2px;
      background: var(--celadon-deep);
      position: relative;
      border-radius: 2px;
    }

    .menu-toggle span::before,
    .menu-toggle span::after {
      content: "";
      position: absolute;
      left: 0;
      width: 18px;
      height: 2px;
      background: var(--celadon-deep);
      border-radius: 2px;
      transition: transform 0.25s ease;
    }

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

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

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

    .mobile-panel a {
      display: block;
      padding: 12px 14px;
      border-radius: 14px;
      color: var(--ink);
    }

    .mobile-panel a:hover {
      background: rgba(127, 169, 155, 0.14);
    }

    main {
      background:
        linear-gradient(90deg, rgba(127, 169, 155, 0.08) 1px, transparent 1px),
        linear-gradient(180deg, rgba(127, 169, 155, 0.06), rgba(255, 255, 255, 0));
      background-size: 64px 64px, auto;
    }

    section {
      padding: 44px 0;
    }

    .hero {
      padding: 58px 0 38px;
    }

    .hero-layout {
      display: grid;
      grid-template-columns: minmax(0, 1.06fr) minmax(300px, 0.94fr);
      gap: 32px;
      align-items: center;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      border: 1px solid var(--line);
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.58);
      color: var(--celadon-deep);
      font-size: 13px;
      font-weight: 700;
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--warm);
      box-shadow: 0 0 0 5px rgba(185, 149, 101, 0.12);
    }

    h1 {
      margin: 18px 0 16px;
      font-size: clamp(32px, 6vw, 54px);
      line-height: 1.12;
      letter-spacing: -0.04em;
      color: #1f332f;
    }

    .hero-lead {
      margin: 0;
      max-width: 660px;
      color: #4f5f5a;
      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;
      gap: 8px;
      min-height: 46px;
      padding: 12px 20px;
      border-radius: 999px;
      font-weight: 700;
      transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
    }

    .btn-primary {
      color: #ffffff;
      background: linear-gradient(135deg, var(--celadon-deep), #5e9384);
      box-shadow: 0 16px 34px rgba(63, 116, 104, 0.22);
    }

    .btn-secondary {
      color: var(--celadon-deep);
      background: rgba(255, 255, 255, 0.74);
      border: 1px solid var(--line);
    }

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

    .hero-note {
      margin-top: 18px;
      color: var(--muted);
      font-size: 14px;
    }

    .hero-card {
      position: relative;
      padding: 26px;
      border-radius: var(--radius-xl);
      background:
        linear-gradient(145deg, rgba(255, 255, 255, 0.92), rgba(239, 247, 242, 0.88)),
        radial-gradient(circle at 90% 10%, rgba(185, 149, 101, 0.14), transparent 32%);
      border: 1px solid rgba(255, 255, 255, 0.86);
      box-shadow: var(--shadow);
      overflow: hidden;
    }

    .hero-card::after {
      content: "";
      position: absolute;
      width: 180px;
      height: 180px;
      right: -70px;
      bottom: -70px;
      border-radius: 50%;
      background: rgba(127, 169, 155, 0.16);
      pointer-events: none;
    }

    .answer-box {
      position: relative;
      z-index: 1;
    }

    .answer-title {
      margin: 0 0 10px;
      font-size: 22px;
      color: #203733;
    }

    .answer-box p {
      margin: 0;
      color: #52615d;
    }

    .answer-list {
      position: relative;
      z-index: 1;
      display: grid;
      gap: 12px;
      margin-top: 22px;
    }

    .answer-item {
      padding: 15px;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.78);
      border: 1px solid var(--line);
    }

    .answer-item strong {
      display: block;
      color: var(--celadon-deep);
      margin-bottom: 4px;
    }

    .answer-item span {
      display: block;
      color: #5c6a66;
      font-size: 14px;
    }

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

    .section-head h2 {
      margin: 0;
      font-size: clamp(24px, 4vw, 36px);
      line-height: 1.22;
      color: #243a35;
    }

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

    .toc-strip {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 12px;
      padding: 14px;
      border-radius: var(--radius-lg);
      background: rgba(255, 255, 255, 0.64);
      border: 1px solid var(--line);
      box-shadow: 0 12px 32px rgba(44, 76, 69, 0.06);
    }

    .toc-strip a {
      padding: 14px 12px;
      border-radius: 16px;
      color: #304742;
      background: rgba(246, 243, 234, 0.68);
      text-align: center;
      font-weight: 700;
      transition: background 0.25s ease, color 0.25s ease, transform 0.25s ease;
    }

    .toc-strip a:hover {
      background: var(--celadon-deep);
      color: #ffffff;
      transform: translateY(-2px);
    }

    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 18px;
    }

    .service-card {
      padding: 24px;
      border-radius: var(--radius-lg);
      background: rgba(255, 255, 255, 0.74);
      border: 1px solid rgba(127, 169, 155, 0.22);
      box-shadow: 0 14px 34px rgba(44, 76, 69, 0.07);
      transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 20px 44px rgba(44, 76, 69, 0.12);
      border-color: rgba(63, 116, 104, 0.34);
    }

    .service-card h3 {
      margin: 0 0 10px;
      font-size: 19px;
      color: #243a35;
    }

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

    .solution-panel {
      display: grid;
      grid-template-columns: 0.92fr 1.08fr;
      gap: 22px;
      align-items: stretch;
    }

    .quiet-card {
      padding: 26px;
      border-radius: var(--radius-xl);
      background: linear-gradient(160deg, rgba(255, 255, 255, 0.86), rgba(232, 243, 237, 0.74));
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
    }

    .quiet-card h3 {
      margin: 0 0 14px;
      font-size: 23px;
    }

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

    .step-list {
      display: grid;
      gap: 14px;
    }

    .step {
      display: grid;
      grid-template-columns: 38px 1fr;
      gap: 12px;
      align-items: start;
    }

    .step b {
      width: 38px;
      height: 38px;
      border-radius: 14px;
      display: grid;
      place-items: center;
      color: #ffffff;
      background: var(--celadon-deep);
      font-size: 14px;
    }

    .step strong {
      display: block;
      color: #243a35;
      margin-bottom: 4px;
    }

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

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

    .detail-list li {
      padding: 16px 18px;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.68);
      border: 1px solid var(--line);
      color: #53625e;
    }

    .detail-list strong {
      color: var(--celadon-deep);
    }

    .assurance {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 18px;
    }

    .assurance-card {
      padding: 22px;
      border-radius: var(--radius-lg);
      background: rgba(255, 255, 255, 0.70);
      border: 1px solid var(--line);
    }

    .assurance-card h3 {
      margin: 0 0 10px;
      font-size: 19px;
    }

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

    .image-row {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 14px;
      margin-top: 20px;
    }

    .image-box {
      border-radius: 22px;
      overflow: hidden;
      background: var(--celadon-light);
      border: 1px solid var(--line);
      aspect-ratio: 4 / 3;
    }

    .image-box img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      padding: 6px;
      background: #ffffff;
    }

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

    .faq-item {
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.76);
      border: 1px solid var(--line);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      border: 0;
      background: transparent;
      color: #243a35;
      padding: 18px 20px;
      text-align: left;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      font-size: 16px;
      font-weight: 800;
      cursor: pointer;
    }

    .faq-question::after {
      content: "+";
      width: 26px;
      height: 26px;
      border-radius: 50%;
      display: grid;
      place-items: center;
      color: var(--celadon-deep);
      background: rgba(127, 169, 155, 0.14);
      flex-shrink: 0;
      transition: transform 0.25s ease;
    }

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

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

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

    .contact-card {
      display: grid;
      grid-template-columns: 1fr 0.85fr;
      gap: 22px;
      align-items: stretch;
      padding: 28px;
      border-radius: var(--radius-xl);
      background:
        linear-gradient(135deg, rgba(63, 116, 104, 0.96), rgba(101, 145, 133, 0.92)),
        radial-gradient(circle at 90% 0%, rgba(255, 255, 255, 0.18), transparent 30%);
      color: #ffffff;
      box-shadow: 0 22px 52px rgba(44, 76, 69, 0.20);
    }

    .contact-card h2 {
      margin: 0 0 12px;
      font-size: clamp(24px, 4vw, 34px);
      line-height: 1.25;
    }

    .contact-card p {
      margin: 0;
      color: rgba(255, 255, 255, 0.88);
    }

    .contact-info {
      display: grid;
      gap: 12px;
    }

    .contact-info div {
      padding: 14px 16px;
      border-radius: 16px;
      background: rgba(255, 255, 255, 0.13);
      border: 1px solid rgba(255, 255, 255, 0.22);
      color: #ffffff;
    }

    .contact-info strong {
      display: block;
      margin-bottom: 3px;
      color: #ffffff;
    }

    .contact-info a {
      color: #ffffff;
      text-decoration: underline;
      text-underline-offset: 4px;
    }

    .related-links {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 20px;
    }

    .related-links a {
      padding: 9px 12px;
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.70);
      border: 1px solid var(--line);
      color: #36544d;
      font-size: 14px;
    }

    .site-footer {
      background: #edf4ef;
      border-top: 1px solid rgba(63, 116, 104, 0.16);
      color: #30443f;
      padding: 26px 0;
    }

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

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

    .footer-brand .logo-mark {
      width: 36px;
      height: 36px;
      border-radius: 14px;
      font-size: 19px;
    }

    .footer-copy {
      color: #5f6f6a;
      font-size: 14px;
    }

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

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

    @media (prefers-reduced-motion: reduce) {
      html {
        scroll-behavior: auto;
      }

      .reveal,
      .service-card,
      .btn,
      .nav-links a {
        transition: none;
      }
    }

    @media (max-width: 900px) {
      .nav-links,
      .nav-cta {
        display: none;
      }

      .menu-toggle {
        display: inline-flex;
      }

      .mobile-panel.open {
        display: grid;
        gap: 4px;
      }

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

      .toc-strip,
      .service-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .section-head {
        display: block;
      }

      .section-head p {
        margin-top: 10px;
      }
    }

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

      section {
        padding: 34px 0;
      }

      .hero {
        padding-top: 38px;
      }

      .toc-strip,
      .service-grid,
      .assurance,
      .image-row {
        grid-template-columns: 1fr;
      }

      .hero-actions {
        flex-direction: column;
      }

      .btn {
        width: 100%;
      }

      .contact-card {
        padding: 22px;
      }

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