:root {
      --bg: #f6f7f9;
      --bg-soft: #eef1f5;
      --card: rgba(255, 255, 255, 0.86);
      --card-solid: #ffffff;
      --text: #1f2933;
      --muted: #657180;
      --line: #d9dee7;
      --silver: #aeb7c4;
      --deep: #2d3748;
      --accent: #4f6f8f;
      --accent-2: #7d8794;
      --warm: #f4efe7;
      --shadow: 0 18px 48px rgba(45, 55, 72, 0.12);
      --shadow-soft: 0 10px 30px rgba(45, 55, 72, 0.08);
      --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", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
      color: var(--text);
      background:
        radial-gradient(circle at 12% 8%, rgba(207, 214, 224, 0.78), transparent 28%),
        radial-gradient(circle at 88% 18%, rgba(244, 239, 231, 0.9), transparent 30%),
        linear-gradient(145deg, #fbfbfc 0%, var(--bg) 46%, #eef1f5 100%);
      line-height: 1.72;
      overflow-x: hidden;
    }

    body::before {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      background-image:
        radial-gradient(circle, rgba(79, 111, 143, 0.16) 1px, transparent 1.4px),
        linear-gradient(110deg, rgba(255, 255, 255, 0.28), transparent 38%);
      background-size: 32px 32px, 100% 100%;
      opacity: 0.28;
      z-index: -1;
    }

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

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

    button {
      font: inherit;
    }

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

    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      backdrop-filter: blur(18px);
      background: rgba(246, 247, 249, 0.78);
      border-bottom: 1px solid rgba(217, 222, 231, 0.72);
    }

    .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;
    }

    .brand-mark {
      width: 42px;
      height: 42px;
      border-radius: 15px;
      display: grid;
      place-items: center;
      color: #1f2933;
      font-weight: 800;
      font-size: 22px;
      background: linear-gradient(145deg, #ffffff, #dfe4eb);
      border: 1px solid rgba(174, 183, 196, 0.72);
      box-shadow: inset 0 1px 0 #fff, 0 10px 24px rgba(45, 55, 72, 0.12);
    }

    .brand-text {
      display: flex;
      flex-direction: column;
      line-height: 1.18;
    }

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

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

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

    .nav-links a {
      padding: 9px 12px;
      color: #3c4652;
      font-size: 14px;
      border-radius: 999px;
      transition: background 0.25s ease, color 0.25s ease, transform 0.25s ease;
    }

    .nav-links a:hover {
      background: rgba(255, 255, 255, 0.76);
      color: var(--accent);
      transform: translateY(-1px);
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 16px;
      color: #ffffff;
      background: linear-gradient(135deg, #2f3f52, #5f7185);
      border-radius: 999px;
      box-shadow: 0 12px 28px rgba(47, 63, 82, 0.18);
      white-space: nowrap;
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }

    .nav-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 16px 34px rgba(47, 63, 82, 0.25);
    }

    .menu-toggle {
      display: none;
      width: 42px;
      height: 42px;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: rgba(255, 255, 255, 0.86);
      color: var(--deep);
      cursor: pointer;
    }

    .menu-toggle span {
      display: block;
      width: 18px;
      height: 2px;
      margin: 5px auto;
      background: currentColor;
      border-radius: 10px;
      transition: transform 0.25s ease, opacity 0.25s ease;
    }

    .hero {
      padding: 58px 0 34px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.08fr) minmax(300px, 0.92fr);
      gap: 30px;
      align-items: stretch;
    }

    .hero-copy {
      padding: 36px;
      border: 1px solid rgba(217, 222, 231, 0.86);
      border-radius: var(--radius-xl);
      background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(244, 246, 249, 0.84)),
        radial-gradient(circle at 8% 12%, rgba(174, 183, 196, 0.38), transparent 34%);
      box-shadow: var(--shadow);
      position: relative;
      overflow: hidden;
    }

    .hero-copy::after {
      content: "";
      position: absolute;
      width: 170px;
      height: 170px;
      right: -62px;
      bottom: -70px;
      border-radius: 50%;
      border: 34px solid rgba(174, 183, 196, 0.16);
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      color: #435263;
      background: rgba(238, 241, 245, 0.82);
      border: 1px solid rgba(217, 222, 231, 0.9);
      border-radius: 999px;
      font-size: 13px;
      margin-bottom: 18px;
    }

    .eyebrow::before {
      content: "";
      width: 7px;
      height: 7px;
      border-radius: 50%;
      background: var(--accent);
      box-shadow: 0 0 0 5px rgba(79, 111, 143, 0.12);
    }

    h1 {
      margin: 0;
      font-size: clamp(32px, 6vw, 58px);
      line-height: 1.08;
      letter-spacing: -0.05em;
      color: #17202b;
    }

    .hero-lead {
      max-width: 680px;
      margin: 20px 0 0;
      color: #4f5d6b;
      font-size: 17px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 28px;
      position: relative;
      z-index: 1;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 9px;
      min-height: 46px;
      padding: 12px 18px;
      border-radius: 999px;
      font-weight: 700;
      border: 1px solid transparent;
      cursor: pointer;
      transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
    }

    .btn-primary {
      color: #ffffff;
      background: linear-gradient(135deg, #263446, #64768a);
      box-shadow: 0 14px 30px rgba(38, 52, 70, 0.22);
    }

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

    .btn-ghost {
      color: #253242;
      background: rgba(255, 255, 255, 0.78);
      border-color: rgba(174, 183, 196, 0.72);
    }

    .hero-panel {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .inspection-card {
      padding: 26px;
      border-radius: var(--radius-xl);
      background: linear-gradient(160deg, rgba(45, 55, 72, 0.95), rgba(96, 110, 126, 0.9));
      color: #ffffff;
      box-shadow: var(--shadow);
      overflow: hidden;
      position: relative;
      min-height: 250px;
    }

    .inspection-card::before {
      content: "";
      position: absolute;
      inset: -60px -70px auto auto;
      width: 180px;
      height: 180px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(255, 255, 255, 0.32), transparent 62%);
      animation: drift 8s ease-in-out infinite;
    }

    .inspection-card h2 {
      margin: 0 0 12px;
      font-size: 24px;
      line-height: 1.25;
      color: #ffffff;
    }

    .inspection-card p {
      margin: 0;
      color: rgba(255, 255, 255, 0.84);
    }

    .check-list {
      display: grid;
      gap: 10px;
      margin: 22px 0 0;
      padding: 0;
      list-style: none;
      position: relative;
      z-index: 1;
    }

    .check-list li {
      display: flex;
      gap: 9px;
      align-items: flex-start;
      color: rgba(255, 255, 255, 0.92);
      font-size: 14px;
    }

    .check-list li::before {
      content: "✓";
      flex: 0 0 20px;
      width: 20px;
      height: 20px;
      border-radius: 50%;
      display: inline-grid;
      place-items: center;
      background: rgba(255, 255, 255, 0.16);
      color: #ffffff;
      font-size: 12px;
    }

    .mini-info {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 14px;
    }

    .mini-card {
      padding: 18px;
      border-radius: var(--radius-lg);
      background: rgba(255, 255, 255, 0.78);
      border: 1px solid rgba(217, 222, 231, 0.82);
      box-shadow: var(--shadow-soft);
    }

    .mini-card strong {
      display: block;
      font-size: 15px;
      margin-bottom: 4px;
      color: #243142;
    }

    .mini-card span {
      color: var(--muted);
      font-size: 13px;
    }

    .section {
      padding: 34px 0;
    }

    .section-head {
      display: flex;
      align-items: flex-end;
      justify-content: space-between;
      gap: 22px;
      margin-bottom: 22px;
    }

    .section-kicker {
      display: block;
      color: var(--accent);
      font-size: 13px;
      font-weight: 800;
      letter-spacing: 0.08em;
      margin-bottom: 6px;
    }

    .section h2 {
      margin: 0;
      font-size: clamp(25px, 4vw, 38px);
      line-height: 1.18;
      letter-spacing: -0.035em;
      color: #1b2531;
    }

    .section-desc {
      max-width: 420px;
      margin: 0;
      color: var(--muted);
      font-size: 15px;
    }

    .toc {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 12px;
      padding: 16px;
      border-radius: var(--radius-xl);
      background: rgba(255, 255, 255, 0.72);
      border: 1px solid rgba(217, 222, 231, 0.82);
      box-shadow: var(--shadow-soft);
    }

    .toc a {
      padding: 14px 13px;
      border-radius: 16px;
      color: #354354;
      background: linear-gradient(145deg, rgba(255, 255, 255, 0.92), rgba(239, 242, 246, 0.75));
      border: 1px solid rgba(217, 222, 231, 0.76);
      font-weight: 700;
      font-size: 14px;
      transition: transform 0.25s ease, border-color 0.25s ease, color 0.25s ease;
    }

    .toc a:hover {
      transform: translateY(-2px);
      border-color: rgba(79, 111, 143, 0.45);
      color: var(--accent);
    }

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

    .service-card {
      padding: 22px;
      border-radius: var(--radius-lg);
      background: var(--card);
      border: 1px solid rgba(217, 222, 231, 0.82);
      box-shadow: var(--shadow-soft);
      transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.28s ease;
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 18px 38px rgba(45, 55, 72, 0.13);
      border-color: rgba(79, 111, 143, 0.42);
    }

    .icon {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      border-radius: 15px;
      margin-bottom: 16px;
      color: #2f3f52;
      background: linear-gradient(145deg, #ffffff, #e1e6ed);
      border: 1px solid rgba(174, 183, 196, 0.56);
      font-weight: 800;
    }

    .service-card h3 {
      margin: 0 0 9px;
      font-size: 18px;
      line-height: 1.35;
      color: #1f2b38;
    }

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

    .split-panel {
      display: grid;
      grid-template-columns: 0.85fr 1.15fr;
      gap: 18px;
      align-items: start;
    }

    .note-box,
    .process-box {
      border-radius: var(--radius-xl);
      border: 1px solid rgba(217, 222, 231, 0.82);
      background: rgba(255, 255, 255, 0.78);
      box-shadow: var(--shadow-soft);
    }

    .note-box {
      padding: 26px;
      position: sticky;
      top: 96px;
    }

    .note-box h3,
    .process-box h3 {
      margin: 0 0 12px;
      color: #1f2b38;
      font-size: 22px;
    }

    .note-box p {
      margin: 0 0 16px;
      color: var(--muted);
    }

    .pill-list {
      display: flex;
      flex-wrap: wrap;
      gap: 9px;
      padding: 0;
      margin: 0;
      list-style: none;
    }

    .pill-list li {
      padding: 8px 11px;
      color: #3c4652;
      background: rgba(238, 241, 245, 0.9);
      border: 1px solid rgba(217, 222, 231, 0.92);
      border-radius: 999px;
      font-size: 13px;
    }

    .process-box {
      padding: 12px;
    }

    .step {
      display: grid;
      grid-template-columns: 46px 1fr;
      gap: 14px;
      padding: 18px;
      border-radius: 20px;
      transition: background 0.25s ease;
    }

    .step + .step {
      border-top: 1px solid rgba(217, 222, 231, 0.7);
    }

    .step:hover {
      background: rgba(246, 247, 249, 0.82);
    }

    .step-num {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      border-radius: 14px;
      color: #ffffff;
      background: linear-gradient(145deg, #4d5d70, #8793a2);
      font-weight: 800;
      box-shadow: 0 10px 20px rgba(45, 55, 72, 0.14);
    }

    .step h3 {
      margin: 0 0 5px;
      font-size: 18px;
    }

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

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

    .assurance-card {
      padding: 24px;
      border-radius: var(--radius-xl);
      background:
        linear-gradient(160deg, rgba(255, 255, 255, 0.9), rgba(240, 243, 247, 0.72));
      border: 1px solid rgba(217, 222, 231, 0.86);
      box-shadow: var(--shadow-soft);
    }

    .assurance-card h3 {
      margin: 0 0 10px;
      font-size: 19px;
      color: #1f2b38;
    }

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

    .warranty-table {
      overflow: hidden;
      border-radius: var(--radius-xl);
      border: 1px solid rgba(217, 222, 231, 0.9);
      background: rgba(255, 255, 255, 0.82);
      box-shadow: var(--shadow-soft);
    }

    .warranty-row {
      display: grid;
      grid-template-columns: 180px 1fr;
      gap: 0;
    }

    .warranty-row + .warranty-row {
      border-top: 1px solid rgba(217, 222, 231, 0.82);
    }

    .warranty-row strong,
    .warranty-row span {
      padding: 16px 18px;
      display: block;
    }

    .warranty-row strong {
      background: rgba(238, 241, 245, 0.82);
      color: #263446;
    }

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

    .contact-card {
      display: grid;
      grid-template-columns: 1fr 0.86fr;
      gap: 20px;
      align-items: stretch;
      padding: 22px;
      border-radius: 32px;
      background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.88), rgba(238, 241, 245, 0.78));
      border: 1px solid rgba(217, 222, 231, 0.88);
      box-shadow: var(--shadow);
    }

    .contact-main {
      padding: 10px 8px 10px 10px;
    }

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

    .contact-list li {
      display: grid;
      grid-template-columns: 92px 1fr;
      gap: 10px;
      padding: 12px 0;
      border-bottom: 1px solid rgba(217, 222, 231, 0.72);
    }

    .contact-list strong {
      color: #263446;
    }

    .contact-list span,
    .contact-list a {
      color: #536171;
    }

    .contact-visual {
      border-radius: 24px;
      min-height: 270px;
      overflow: hidden;
      background:
        linear-gradient(160deg, rgba(45, 55, 72, 0.78), rgba(126, 139, 154, 0.58)),
        linear-gradient(135deg, #dfe4eb, #ffffff);
      display: grid;
      align-items: end;
      position: relative;
    }

    .contact-visual img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.52;
      position: absolute;
      inset: 0;
    }

    .visual-caption {
      position: relative;
      z-index: 1;
      padding: 24px;
      color: #ffffff;
    }

    .visual-caption strong {
      display: block;
      font-size: 22px;
      line-height: 1.25;
      margin-bottom: 8px;
    }

    .visual-caption span {
      color: rgba(255, 255, 255, 0.84);
    }

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

    .faq-item {
      border: 1px solid rgba(217, 222, 231, 0.86);
      border-radius: 20px;
      background: rgba(255, 255, 255, 0.8);
      box-shadow: 0 8px 22px rgba(45, 55, 72, 0.06);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      padding: 18px 20px;
      border: 0;
      background: transparent;
      color: #1f2b38;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      text-align: left;
      cursor: pointer;
      font-weight: 800;
    }

    .faq-question::after {
      content: "+";
      flex: 0 0 28px;
      width: 28px;
      height: 28px;
      display: grid;
      place-items: center;
      border-radius: 50%;
      color: #344254;
      background: rgba(238, 241, 245, 0.9);
      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);
      font-size: 15px;
    }

    .faq-item.active .faq-answer {
      display: block;
      animation: fadeDown 0.24s ease both;
    }

    .links-panel {
      padding: 24px;
      border-radius: var(--radius-xl);
      background: rgba(255, 255, 255, 0.76);
      border: 1px solid rgba(217, 222, 231, 0.86);
      box-shadow: var(--shadow-soft);
    }

    .links-panel h2 {
      margin-bottom: 14px;
    }

    .link-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 10px 14px;
      margin-top: 14px;
    }

    .link-grid a {
      padding: 12px 14px;
      color: #3b4a5d;
      background: rgba(246, 247, 249, 0.78);
      border: 1px solid rgba(217, 222, 231, 0.78);
      border-radius: 15px;
      font-size: 14px;
      transition: transform 0.25s ease, color 0.25s ease, background 0.25s ease;
    }

    .link-grid a:hover {
      color: var(--accent);
      background: #ffffff;
      transform: translateY(-2px);
    }

    .summary {
      padding: 28px;
      border-radius: var(--radius-xl);
      color: #253242;
      background:
        linear-gradient(135deg, rgba(244, 239, 231, 0.9), rgba(255, 255, 255, 0.82)),
        linear-gradient(160deg, rgba(238, 241, 245, 0.92), rgba(255, 255, 255, 0.62));
      border: 1px solid rgba(217, 222, 231, 0.86);
      box-shadow: var(--shadow-soft);
    }

    .summary p {
      margin: 0;
      color: #4d5b6a;
    }

    .site-footer {
      margin-top: 18px;
      padding: 28px 0;
      color: #d9e0e8;
      background: linear-gradient(135deg, #232c38, #3c4654);
      border-top: 1px solid rgba(255, 255, 255, 0.12);
    }

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

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

    .footer-brand .brand-mark {
      width: 38px;
      height: 38px;
      color: #1f2933;
      background: linear-gradient(145deg, #ffffff, #d9dee7);
    }

    .footer-brand strong {
      display: block;
      color: #ffffff;
      line-height: 1.2;
    }

    .footer-brand span,
    .copyright {
      color: rgba(255, 255, 255, 0.7);
      font-size: 13px;
    }

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

    .footer-links a {
      color: rgba(255, 255, 255, 0.78);
      font-size: 14px;
    }

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

    .reveal {
      opacity: 0;
      transform: translateY(16px);
      transition: opacity 0.65s ease, transform 0.65s ease;
    }

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

    .back-top {
      position: fixed;
      right: 18px;
      bottom: 18px;
      width: 44px;
      height: 44px;
      border: 1px solid rgba(217, 222, 231, 0.88);
      border-radius: 50%;
      background: rgba(255, 255, 255, 0.92);
      color: #263446;
      box-shadow: var(--shadow-soft);
      cursor: pointer;
      opacity: 0;
      visibility: hidden;
      transform: translateY(10px);
      transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
    }

    .back-top.show {
      opacity: 1;
      visibility: visible;
      transform: translateY(0);
    }

    @keyframes drift {
      0%, 100% {
        transform: translate(0, 0) scale(1);
      }
      50% {
        transform: translate(-18px, 16px) scale(1.06);
      }
    }

    @keyframes fadeDown {
      from {
        opacity: 0;
        transform: translateY(-4px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    @media (max-width: 980px) {
      .menu-toggle {
        display: inline-block;
      }

      .nav-links {
        position: absolute;
        left: 18px;
        right: 18px;
        top: 72px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
        padding: 14px;
        border: 1px solid rgba(217, 222, 231, 0.9);
        border-radius: 22px;
        background: rgba(255, 255, 255, 0.96);
        box-shadow: var(--shadow);
      }

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

      .nav-links a,
      .nav-cta {
        width: 100%;
        justify-content: center;
      }

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

      .note-box {
        position: static;
      }

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

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

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

      .hero {
        padding-top: 34px;
      }

      .hero-copy,
      .inspection-card,
      .summary,
      .links-panel {
        padding: 22px;
        border-radius: 24px;
      }

      .section {
        padding: 28px 0;
      }

      .section-head {
        display: block;
      }

      .section-desc {
        margin-top: 10px;
      }

      .toc,
      .service-grid,
      .assurance,
      .mini-info,
      .link-grid {
        grid-template-columns: 1fr;
      }

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

      .warranty-row span {
        padding-top: 0;
      }

      .contact-list li {
        grid-template-columns: 1fr;
        gap: 2px;
      }

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

      .footer-links {
        justify-content: flex-start;
      }

      .brand-text span {
        display: none;
      }
    }