:root {
      --bg: #f6efe1;
      --bg-deep: #ead9bd;
      --card: #fffaf0;
      --ink: #2b241c;
      --muted: #6d6255;
      --line: #d2b887;
      --brass: #b2752d;
      --brass-dark: #75461e;
      --copper: #c46d3b;
      --steel: #34414a;
      --green: #42634a;
      --shadow: 0 18px 48px rgba(82, 55, 25, 0.14);
      --radius-lg: 26px;
      --radius-md: 18px;
      --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(--ink);
      background:
        radial-gradient(circle at 12% 8%, rgba(196, 109, 59, 0.14), transparent 32%),
        radial-gradient(circle at 90% 18%, rgba(178, 117, 45, 0.16), transparent 34%),
        linear-gradient(135deg, #fbf4e8 0%, #f1e1c4 48%, #f8f2e7 100%);
      line-height: 1.75;
      overflow-x: hidden;
    }

    body::before {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      opacity: 0.18;
      background-image:
        linear-gradient(rgba(117, 70, 30, 0.13) 1px, transparent 1px),
        linear-gradient(90deg, rgba(117, 70, 30, 0.13) 1px, transparent 1px);
      background-size: 34px 34px;
      z-index: -2;
    }

    body::after {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      background: linear-gradient(180deg, rgba(255,255,255,0.34), rgba(255,255,255,0.1));
      z-index: -1;
    }

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

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

    .container {
      width: min(100% - 32px, var(--container));
      margin: 0 auto;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(250, 242, 228, 0.88);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(117, 70, 30, 0.18);
    }

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

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      min-width: 0;
      font-weight: 900;
      color: var(--ink);
      letter-spacing: 0.04em;
    }

    .logo-mark {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      display: grid;
      place-items: center;
      color: #fff8e9;
      background:
        radial-gradient(circle at 34% 28%, #d9964d, #8c4e22 70%);
      border: 2px solid #51341e;
      box-shadow: inset 0 0 0 4px rgba(255, 241, 205, 0.22), 0 8px 18px rgba(83, 49, 22, 0.22);
      font-size: 22px;
    }

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

    .brand-text small {
      margin-top: 3px;
      font-size: 12px;
      font-weight: 700;
      color: var(--muted);
      letter-spacing: 0;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-left: auto;
    }

    .nav-links a {
      padding: 10px 12px;
      border-radius: 999px;
      font-size: 14px;
      font-weight: 700;
      color: #3d3429;
      transition: background 0.2s ease, transform 0.2s ease;
    }

    .nav-links a:hover {
      background: rgba(178, 117, 45, 0.14);
      transform: translateY(-1px);
    }

    .nav-action {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 42px;
      padding: 10px 16px;
      border-radius: 999px;
      color: #fff8e9;
      background: linear-gradient(135deg, var(--steel), #1f2a31);
      box-shadow: 0 10px 22px rgba(31, 42, 49, 0.18);
      font-weight: 800;
      white-space: nowrap;
    }

    .menu-btn {
      display: none;
      width: 44px;
      height: 44px;
      border: 1px solid rgba(117, 70, 30, 0.28);
      border-radius: 14px;
      background: #fff7e8;
      color: var(--ink);
      font-size: 22px;
      cursor: pointer;
    }

    .hero {
      padding: 48px 0 28px;
    }

    .hero-panel {
      position: relative;
      overflow: hidden;
      display: grid;
      grid-template-columns: minmax(0, 1.06fr) minmax(300px, 0.94fr);
      gap: 28px;
      align-items: stretch;
      padding: clamp(24px, 4vw, 46px);
      border: 1px solid rgba(117, 70, 30, 0.22);
      border-radius: 34px;
      background:
        linear-gradient(120deg, rgba(255, 250, 240, 0.95), rgba(239, 221, 190, 0.82)),
        repeating-linear-gradient(90deg, transparent 0, transparent 18px, rgba(117,70,30,0.05) 19px, transparent 20px);
      box-shadow: var(--shadow);
    }

    .hero-panel::before {
      content: "";
      position: absolute;
      width: 220px;
      height: 220px;
      right: -70px;
      top: -74px;
      border-radius: 50%;
      border: 18px solid rgba(117, 70, 30, 0.12);
      box-shadow: inset 0 0 0 18px rgba(178, 117, 45, 0.10);
      animation: gearTurn 28s linear infinite;
    }

    .hero-content {
      position: relative;
      z-index: 1;
      display: flex;
      flex-direction: column;
      justify-content: center;
      gap: 18px;
    }

    .eyebrow {
      width: fit-content;
      display: inline-flex;
      align-items: center;
      gap: 9px;
      padding: 8px 13px;
      border-radius: 999px;
      background: rgba(66, 99, 74, 0.12);
      color: #31503a;
      border: 1px solid rgba(66, 99, 74, 0.22);
      font-weight: 800;
      font-size: 13px;
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--green);
      box-shadow: 0 0 0 5px rgba(66,99,74,0.12);
    }

    h1 {
      margin: 0;
      max-width: 720px;
      font-size: clamp(34px, 7vw, 64px);
      line-height: 1.06;
      letter-spacing: -0.05em;
      color: #221a13;
    }

    .hero-desc {
      margin: 0;
      max-width: 680px;
      color: #51473a;
      font-size: clamp(16px, 2vw, 18px);
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 4px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 48px;
      padding: 12px 18px;
      border-radius: 14px;
      border: 1px solid transparent;
      font-weight: 900;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
      cursor: pointer;
    }

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

    .btn-primary {
      color: #fff8e9;
      background: linear-gradient(135deg, #b2752d, #7c431c);
      box-shadow: 0 14px 28px rgba(124, 67, 28, 0.22);
    }

    .btn-secondary {
      color: #2d241c;
      background: rgba(255, 250, 240, 0.78);
      border-color: rgba(117, 70, 30, 0.26);
    }

    .hero-note {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      margin-top: 8px;
    }

    .note-item {
      padding: 12px;
      border-radius: 16px;
      background: rgba(255, 250, 240, 0.64);
      border: 1px dashed rgba(117, 70, 30, 0.28);
    }

    .note-item strong {
      display: block;
      font-size: 15px;
      color: #2b241c;
    }

    .note-item span {
      display: block;
      margin-top: 2px;
      color: var(--muted);
      font-size: 13px;
    }

    .hero-visual {
      position: relative;
      z-index: 1;
      display: grid;
      gap: 14px;
      align-content: center;
    }

    .phone-frame {
      position: relative;
      padding: 16px;
      border-radius: 28px;
      background: linear-gradient(145deg, #3b454d, #1f272d);
      box-shadow: inset 0 0 0 1px rgba(255,255,255,0.12), 0 20px 44px rgba(31,42,49,0.22);
    }

    .phone-frame::before,
    .phone-frame::after {
      content: "";
      position: absolute;
      border-radius: 50%;
      background: rgba(234, 217, 189, 0.2);
      border: 1px solid rgba(234, 217, 189, 0.3);
    }

    .phone-frame::before {
      width: 52px;
      height: 52px;
      left: 20px;
      top: 18px;
    }

    .phone-frame::after {
      width: 30px;
      height: 30px;
      right: 22px;
      bottom: 22px;
    }

    .phone-grid {
      position: relative;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      z-index: 1;
    }

    .phone-img {
      overflow: hidden;
      border-radius: 20px;
      background: #fff7e8;
      border: 1px solid rgba(255,255,255,0.18);
      aspect-ratio: 4 / 5;
    }

    .phone-img img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      background: #fbf2e4;
    }

    .status-strip {
      display: grid;
      gap: 8px;
      padding: 16px;
      border-radius: 20px;
      background: rgba(255, 250, 240, 0.82);
      border: 1px solid rgba(117, 70, 30, 0.2);
    }

    .status-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      color: #40362b;
      font-weight: 800;
      font-size: 14px;
    }

    .gauge {
      height: 8px;
      border-radius: 999px;
      background: rgba(117,70,30,0.14);
      overflow: hidden;
    }

    .gauge span {
      display: block;
      width: 76%;
      height: 100%;
      border-radius: inherit;
      background: linear-gradient(90deg, var(--green), var(--brass));
      animation: pulseBar 3.4s ease-in-out infinite;
    }

    section {
      padding: 28px 0;
    }

    .section-head {
      display: flex;
      align-items: end;
      justify-content: space-between;
      gap: 20px;
      margin-bottom: 18px;
    }

    .section-kicker {
      margin: 0 0 6px;
      color: var(--brass-dark);
      font-weight: 900;
      letter-spacing: 0.08em;
      font-size: 13px;
    }

    h2 {
      margin: 0;
      font-size: clamp(25px, 4vw, 38px);
      line-height: 1.22;
      letter-spacing: -0.03em;
      color: #251d16;
    }

    .section-head p {
      max-width: 430px;
      margin: 0;
      color: var(--muted);
    }

    .service-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 14px;
    }

    .service-card {
      position: relative;
      padding: 20px;
      min-height: 170px;
      border-radius: var(--radius-md);
      background: rgba(255, 250, 240, 0.84);
      border: 1px solid rgba(117, 70, 30, 0.2);
      box-shadow: 0 12px 28px rgba(82, 55, 25, 0.08);
      transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
    }

    .service-card:hover {
      transform: translateY(-5px);
      border-color: rgba(178, 117, 45, 0.5);
      box-shadow: 0 18px 34px rgba(82, 55, 25, 0.14);
    }

    .service-icon {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      margin-bottom: 14px;
      border-radius: 13px;
      color: #fff8e9;
      background: linear-gradient(135deg, var(--steel), var(--brass-dark));
      font-weight: 900;
      box-shadow: inset 0 0 0 2px rgba(255,255,255,0.08);
    }

    .service-card h3 {
      margin: 0 0 8px;
      font-size: 18px;
      line-height: 1.35;
      color: #2c2219;
    }

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

    .solution-wrap {
      display: grid;
      grid-template-columns: 0.9fr 1.1fr;
      gap: 18px;
      align-items: start;
    }

    .diagnose-box {
      padding: 24px;
      border-radius: var(--radius-lg);
      background:
        linear-gradient(145deg, rgba(52,65,74,0.96), rgba(42,36,29,0.94));
      color: #fff5e4;
      box-shadow: var(--shadow);
    }

    .diagnose-box h3 {
      margin: 0 0 10px;
      font-size: 24px;
      color: #fff7e8;
    }

    .diagnose-box p {
      margin: 0 0 18px;
      color: #ead9bd;
    }

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

    .step-list li {
      display: flex;
      gap: 12px;
      align-items: flex-start;
      padding: 12px;
      border-radius: 16px;
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(255,255,255,0.12);
    }

    .step-list span {
      flex: 0 0 auto;
      width: 30px;
      height: 30px;
      display: grid;
      place-items: center;
      border-radius: 50%;
      background: #d19448;
      color: #24180f;
      font-weight: 900;
    }

    .solution-cards {
      display: grid;
      gap: 14px;
    }

    .solution-card {
      display: grid;
      grid-template-columns: auto 1fr;
      gap: 14px;
      align-items: start;
      padding: 18px;
      border-radius: 20px;
      background: rgba(255, 250, 240, 0.86);
      border: 1px solid rgba(117, 70, 30, 0.2);
    }

    .bolt {
      width: 34px;
      height: 34px;
      border-radius: 50%;
      display: grid;
      place-items: center;
      color: #fff7e8;
      background: linear-gradient(135deg, var(--copper), var(--brass-dark));
      font-weight: 900;
    }

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

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

    .warranty {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 14px;
    }

    .warranty-card {
      padding: 20px;
      border-radius: 22px;
      background: linear-gradient(180deg, rgba(255,250,240,0.92), rgba(245,232,207,0.86));
      border: 1px solid rgba(117, 70, 30, 0.22);
      box-shadow: 0 12px 28px rgba(82, 55, 25, 0.08);
    }

    .warranty-card strong {
      display: block;
      margin-bottom: 8px;
      color: #2c2219;
      font-size: 18px;
    }

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

    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 0.88fr;
      gap: 18px;
      align-items: stretch;
    }

    .contact-card,
    .qr-card {
      padding: 24px;
      border-radius: var(--radius-lg);
      background: rgba(255, 250, 240, 0.88);
      border: 1px solid rgba(117, 70, 30, 0.22);
      box-shadow: var(--shadow);
    }

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

    .info-list li {
      display: grid;
      grid-template-columns: 88px 1fr;
      gap: 12px;
      padding: 12px;
      border-radius: 15px;
      background: rgba(234, 217, 189, 0.32);
      border: 1px solid rgba(117, 70, 30, 0.14);
    }

    .info-list b {
      color: var(--brass-dark);
    }

    .map-link {
      color: #0b57a3;
      font-weight: 900;
      text-decoration: none;
    }

    .qr-layout {
      display: grid;
      grid-template-columns: 150px 1fr;
      gap: 18px;
      align-items: center;
      margin-top: 16px;
    }

    .qr-img {
      padding: 10px;
      border-radius: 18px;
      background: #fff;
      border: 1px solid rgba(117, 70, 30, 0.2);
    }

    .qr-copy h3 {
      margin: 0 0 6px;
      font-size: 20px;
    }

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

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

    .faq-item {
      border-radius: 20px;
      overflow: hidden;
      background: rgba(255, 250, 240, 0.9);
      border: 1px solid rgba(117, 70, 30, 0.2);
    }

    .faq-btn {
      width: 100%;
      min-height: 58px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 14px;
      padding: 16px 18px;
      border: 0;
      background: transparent;
      color: #2b241c;
      text-align: left;
      font-size: 16px;
      font-weight: 900;
      cursor: pointer;
    }

    .faq-btn span {
      flex: 0 0 auto;
      width: 28px;
      height: 28px;
      display: grid;
      place-items: center;
      border-radius: 50%;
      background: rgba(178,117,45,0.14);
      color: var(--brass-dark);
      transition: transform 0.2s ease;
    }

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

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

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

    .links-panel {
      padding: 22px;
      border-radius: var(--radius-lg);
      background: rgba(255, 250, 240, 0.78);
      border: 1px solid rgba(117, 70, 30, 0.18);
    }

    .links-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 10px 16px;
      margin-top: 14px;
    }

    .links-grid a {
      color: #3d3429;
      font-weight: 700;
      padding: 10px 0;
      border-bottom: 1px dashed rgba(117, 70, 30, 0.18);
    }

    .links-grid a:hover {
      color: var(--brass-dark);
    }

    .site-footer {
      margin-top: 26px;
      padding: 28px 0;
      background: #2b241c;
      color: #f8ebd2;
    }

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

    .footer-inner a {
      color: #f6c77d;
      font-weight: 800;
    }

    .footer-copy {
      margin: 0;
      color: #d8c7a8;
      font-size: 14px;
    }

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

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

    @keyframes gearTurn {
      to {
        transform: rotate(360deg);
      }
    }

    @keyframes pulseBar {
      0%, 100% {
        width: 70%;
      }
      50% {
        width: 84%;
      }
    }

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

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

      .site-header.open .nav-links {
        position: absolute;
        left: 16px;
        right: 16px;
        top: 74px;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 8px;
        padding: 14px;
        border-radius: 20px;
        background: #fff7e8;
        border: 1px solid rgba(117,70,30,0.22);
        box-shadow: var(--shadow);
      }

      .site-header.open .nav-links a {
        background: rgba(178,117,45,0.1);
      }

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

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

      .hero-note {
        grid-template-columns: 1fr;
      }

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

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

      .hero {
        padding-top: 28px;
      }

      .hero-panel {
        padding: 22px;
        border-radius: 24px;
      }

      .service-grid,
      .warranty,
      .links-grid,
      .phone-grid {
        grid-template-columns: 1fr;
      }

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

      .qr-img {
        width: 168px;
      }

      .info-list li {
        grid-template-columns: 1fr;
        gap: 4px;
      }

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

      .btn {
        width: 100%;
      }

      .site-header.open .nav-links {
        grid-template-columns: 1fr;
      }
    }