:root {
      --bg: #f6f3ee;
      --bg-soft: #fffaf3;
      --text: #1f2a37;
      --muted: #5f6b7a;
      --line: #ded6c9;
      --primary: #145c72;
      --primary-dark: #0f4050;
      --accent: #c98b3c;
      --card: rgba(255, 255, 255, 0.86);
      --shadow: 0 18px 48px rgba(31, 42, 55, 0.12);
      --radius-lg: 28px;
      --radius-md: 18px;
      --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(201, 139, 60, 0.16), transparent 32%),
        radial-gradient(circle at 88% 15%, rgba(20, 92, 114, 0.13), transparent 30%),
        linear-gradient(180deg, #fbf7f0 0%, #f4efe7 48%, #f8f5ef 100%);
      line-height: 1.75;
    }

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

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

    .container {
      width: min(var(--container), calc(100% - 40px));
      margin: 0 auto;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(246, 243, 238, 0.92);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(222, 214, 201, 0.78);
    }

    .nav {
      min-height: 74px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 22px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      font-weight: 800;
      letter-spacing: 0.02em;
    }

    .brand-mark {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      border-radius: 14px;
      color: #ffffff;
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      box-shadow: 0 10px 24px rgba(20, 92, 114, 0.22);
      font-size: 22px;
    }

    .brand-name {
      font-size: 18px;
      color: #17212b;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 24px;
      color: #2f3b49;
      font-size: 15px;
    }

    .nav-links a {
      position: relative;
      padding: 8px 0;
    }

    .nav-links a::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: 3px;
      width: 0;
      height: 2px;
      border-radius: 999px;
      background: var(--accent);
      transition: width 0.25s ease;
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .nav-action {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 42px;
      padding: 0 18px;
      border-radius: 999px;
      background: var(--primary);
      color: #ffffff;
      font-weight: 700;
      box-shadow: 0 12px 28px rgba(20, 92, 114, 0.18);
      transition: transform 0.22s ease, background 0.22s ease;
    }

    .nav-action:hover {
      transform: translateY(-2px);
      background: var(--primary-dark);
    }

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

    .menu-toggle span {
      display: block;
      width: 18px;
      height: 2px;
      margin: 4px auto;
      background: var(--primary-dark);
      border-radius: 999px;
    }

    main {
      overflow: hidden;
    }

    .hero {
      padding: 58px 0 46px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.04fr) minmax(320px, 0.76fr);
      gap: 34px;
      align-items: center;
    }

    .hero-copy {
      animation: riseIn 0.7s ease both;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 16px;
      padding: 7px 12px;
      border: 1px solid rgba(20, 92, 114, 0.16);
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.66);
      color: var(--primary-dark);
      font-size: 14px;
      font-weight: 700;
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--accent);
      box-shadow: 0 0 0 5px rgba(201, 139, 60, 0.14);
    }

    h1 {
      margin: 0;
      max-width: 680px;
      font-size: clamp(34px, 5.2vw, 60px);
      line-height: 1.12;
      letter-spacing: -0.04em;
      color: #182330;
    }

    .hero-lead {
      margin: 22px 0 0;
      max-width: 680px;
      color: #435063;
      font-size: 18px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 28px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 48px;
      padding: 0 22px;
      border-radius: 999px;
      font-weight: 800;
      transition: transform 0.22s ease, box-shadow 0.22s ease, background 0.22s ease;
    }

    .btn-primary {
      color: #ffffff;
      background: linear-gradient(135deg, var(--primary), #1d7289);
      box-shadow: 0 16px 34px rgba(20, 92, 114, 0.22);
    }

    .btn-secondary {
      color: var(--primary-dark);
      background: #ffffff;
      border: 1px solid rgba(20, 92, 114, 0.18);
    }

    .btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 18px 36px rgba(31, 42, 55, 0.14);
    }

    .quick-info {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
      margin-top: 30px;
      max-width: 720px;
    }

    .quick-info div {
      padding: 14px 16px;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.72);
      border: 1px solid rgba(222, 214, 201, 0.9);
    }

    .quick-info strong {
      display: block;
      color: #15212d;
      font-size: 15px;
    }

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

    .hero-panel {
      position: relative;
      padding: 22px;
      border-radius: var(--radius-lg);
      background: linear-gradient(145deg, rgba(255, 255, 255, 0.92), rgba(255, 248, 238, 0.72));
      border: 1px solid rgba(222, 214, 201, 0.85);
      box-shadow: var(--shadow);
      animation: riseIn 0.8s 0.1s ease both;
    }

    .hero-panel::before {
      content: "";
      position: absolute;
      inset: 16px auto auto 16px;
      width: 80px;
      height: 80px;
      border-radius: 24px;
      background: rgba(201, 139, 60, 0.14);
      z-index: -1;
    }

    .phone-frame {
      overflow: hidden;
      border-radius: 24px;
      background: #eef2f3;
      border: 1px solid rgba(20, 92, 114, 0.12);
    }

    .phone-frame img {
      width: 100%;
      aspect-ratio: 4 / 3;
      object-fit: contain;
      background: linear-gradient(135deg, #f7fafb, #efe6da);
    }

    .diagnosis-card {
      margin-top: 18px;
      padding: 18px;
      border-radius: 22px;
      background: #ffffff;
      border: 1px solid rgba(222, 214, 201, 0.92);
    }

    .diagnosis-card h2 {
      margin: 0 0 10px;
      font-size: 20px;
      color: #15212d;
    }

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

    .diagnosis-list li {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      color: #485467;
      font-size: 15px;
    }

    .diagnosis-list li::before {
      content: "";
      flex: 0 0 8px;
      width: 8px;
      height: 8px;
      margin-top: 10px;
      border-radius: 50%;
      background: var(--accent);
    }

    .section {
      padding: 44px 0;
    }

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

    .section-head h2 {
      margin: 0;
      max-width: 660px;
      font-size: clamp(26px, 3.4vw, 40px);
      line-height: 1.22;
      letter-spacing: -0.025em;
      color: #17212b;
    }

    .section-head p {
      margin: 0;
      max-width: 420px;
      color: var(--muted);
    }

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

    .service-card {
      padding: 22px;
      min-height: 170px;
      border-radius: 22px;
      background: var(--card);
      border: 1px solid rgba(222, 214, 201, 0.88);
      box-shadow: 0 12px 32px rgba(31, 42, 55, 0.07);
      transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
    }

    .service-card:hover {
      transform: translateY(-5px);
      border-color: rgba(20, 92, 114, 0.24);
      box-shadow: 0 18px 42px rgba(31, 42, 55, 0.11);
    }

    .service-icon {
      width: 38px;
      height: 38px;
      display: grid;
      place-items: center;
      margin-bottom: 14px;
      border-radius: 13px;
      background: rgba(20, 92, 114, 0.1);
      color: var(--primary-dark);
      font-weight: 900;
    }

    .service-card h3 {
      margin: 0 0 8px;
      font-size: 18px;
      color: #17212b;
    }

    .service-card p {
      margin: 0;
      color: #5b6675;
      font-size: 15px;
    }

    .solution-wrap {
      display: grid;
      grid-template-columns: 0.86fr 1.14fr;
      gap: 22px;
      align-items: start;
      padding: 26px;
      border-radius: var(--radius-lg);
      background: rgba(255, 255, 255, 0.68);
      border: 1px solid rgba(222, 214, 201, 0.9);
      box-shadow: var(--shadow);
    }

    .solution-aside {
      padding: 24px;
      border-radius: 24px;
      background: linear-gradient(145deg, #145c72, #0f4050);
      color: #ffffff;
    }

    .solution-aside h2 {
      margin: 0 0 12px;
      font-size: 28px;
      line-height: 1.28;
      color: #ffffff;
    }

    .solution-aside p {
      margin: 0 0 18px;
      color: rgba(255, 255, 255, 0.86);
    }

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

    .anchor-list a {
      display: flex;
      justify-content: space-between;
      gap: 10px;
      padding: 11px 12px;
      border-radius: 14px;
      background: rgba(255, 255, 255, 0.12);
      color: #ffffff;
      transition: background 0.2s ease;
    }

    .anchor-list a:hover {
      background: rgba(255, 255, 255, 0.2);
    }

    .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 rgba(222, 214, 201, 0.94);
    }

    .step-num {
      width: 36px;
      height: 36px;
      display: grid;
      place-items: center;
      border-radius: 12px;
      background: #f4ead9;
      color: #8b5b21;
      font-weight: 900;
    }

    .step h3 {
      margin: 0 0 4px;
      font-size: 18px;
    }

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

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

    .policy-card {
      padding: 20px;
      border-radius: 24px;
      background: linear-gradient(180deg, rgba(255,255,255,0.9), rgba(255,250,243,0.9));
      border: 1px solid rgba(222, 214, 201, 0.9);
    }

    .policy-card h3 {
      margin: 0 0 10px;
      color: #17212b;
      font-size: 19px;
    }

    .policy-card p {
      margin: 0;
      color: #5b6675;
      font-size: 15px;
    }

    .contact-panel {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 22px;
      padding: 28px;
      border-radius: var(--radius-lg);
      background: linear-gradient(135deg, rgba(20, 92, 114, 0.1), rgba(201, 139, 60, 0.12)), rgba(255, 255, 255, 0.74);
      border: 1px solid rgba(222, 214, 201, 0.9);
      box-shadow: var(--shadow);
    }

    .contact-info h2 {
      margin: 0 0 14px;
      font-size: clamp(26px, 3.3vw, 38px);
      line-height: 1.25;
    }

    .contact-list {
      display: grid;
      gap: 12px;
      margin: 20px 0 0;
      padding: 0;
      list-style: none;
    }

    .contact-list li {
      padding: 14px 16px;
      border-radius: 16px;
      background: rgba(255, 255, 255, 0.8);
      border: 1px solid rgba(222, 214, 201, 0.88);
      color: #334155;
    }

    .qr-area {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      align-items: stretch;
    }

    .qr-card {
      padding: 16px;
      border-radius: 22px;
      background: #ffffff;
      border: 1px solid rgba(222, 214, 201, 0.9);
      text-align: center;
    }

    .qr-card img {
      width: 100%;
      max-width: 210px;
      margin: 0 auto 12px;
      aspect-ratio: 1 / 1;
      object-fit: contain;
      border-radius: 16px;
      background: #f6f3ee;
    }

    .qr-card strong {
      display: block;
      margin-bottom: 6px;
      color: #17212b;
    }

    .qr-card a,
    .inline-links a {
      color: #0f5f86;
      font-weight: 700;
      text-decoration: underline;
      text-underline-offset: 3px;
    }

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

    .faq-item {
      border-radius: 20px;
      background: rgba(255, 255, 255, 0.84);
      border: 1px solid rgba(222, 214, 201, 0.9);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
      padding: 18px 20px;
      border: 0;
      background: transparent;
      color: #17212b;
      font: inherit;
      font-weight: 800;
      text-align: left;
      cursor: pointer;
    }

    .faq-question span {
      flex: 1;
    }

    .faq-question::after {
      content: "+";
      flex: 0 0 auto;
      width: 30px;
      height: 30px;
      display: grid;
      place-items: center;
      border-radius: 50%;
      background: rgba(20, 92, 114, 0.1);
      color: var(--primary-dark);
      font-size: 20px;
      transition: transform 0.2s 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;
    }

    .inline-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      padding: 20px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.76);
      border: 1px solid rgba(222, 214, 201, 0.9);
    }

    .site-footer {
      margin-top: 18px;
      padding: 28px 0;
      background: #102f3a;
      color: #ffffff;
    }

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

    .footer-inner p {
      margin: 0;
      color: rgba(255, 255, 255, 0.82);
      font-size: 14px;
    }

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

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

    @keyframes riseIn {
      from {
        opacity: 0;
        transform: translateY(18px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    @media (max-width: 980px) {
      .nav-links,
      .nav-action {
        display: none;
      }

      .menu-toggle {
        display: block;
      }

      .site-header.open .nav-links {
        position: absolute;
        left: 20px;
        right: 20px;
        top: 74px;
        display: grid;
        gap: 6px;
        padding: 16px;
        border-radius: 20px;
        background: #ffffff;
        border: 1px solid var(--line);
        box-shadow: var(--shadow);
      }

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

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

      .section-head {
        display: block;
      }

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

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

      .hero {
        padding-top: 38px;
      }

      .quick-info,
      .service-grid,
      .warranty-strip,
      .qr-area {
        grid-template-columns: 1fr;
      }

      .hero-actions {
        display: grid;
      }

      .btn {
        width: 100%;
      }

      .solution-wrap,
      .contact-panel {
        padding: 18px;
        border-radius: 24px;
      }

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