:root {
      --bg: #fffdf8;
      --bg-soft: #f7f1e7;
      --paper: #ffffff;
      --paper-warm: #fff9ef;
      --text: #27312f;
      --muted: #66726e;
      --line: #eadfce;
      --brand: #4f7d72;
      --brand-deep: #2f5f55;
      --coconut: #f4e7d3;
      --accent: #d79555;
      --shadow: 0 18px 48px rgba(73, 93, 86, 0.12);
      --radius: 22px;
      --container: 1160px;
    }

    * {
      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 8% 6%, rgba(244, 231, 211, 0.74), transparent 26%),
        radial-gradient(circle at 92% 20%, rgba(226, 240, 233, 0.92), transparent 30%),
        linear-gradient(180deg, #fffdf8 0%, #fbf6ec 48%, #fffdf8 100%);
      line-height: 1.7;
    }

    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: 20;
      background: rgba(255, 253, 248, 0.88);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(234, 223, 206, 0.72);
    }

    .nav {
      min-height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      font-weight: 800;
      color: var(--brand-deep);
      white-space: nowrap;
    }

    .logo {
      width: 42px;
      height: 42px;
      border-radius: 14px;
      display: grid;
      place-items: center;
      color: #ffffff;
      background: linear-gradient(135deg, var(--brand), #79a99b);
      box-shadow: 0 10px 24px rgba(79, 125, 114, 0.22);
      font-size: 23px;
      line-height: 1;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 6px;
      color: #40504b;
      font-size: 15px;
    }

    .nav-links a {
      padding: 9px 12px;
      border-radius: 999px;
      transition: background 0.2s ease, color 0.2s ease;
    }

    .nav-links a:hover {
      background: #efe5d5;
      color: var(--brand-deep);
    }

    .nav-action {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 18px;
      border-radius: 999px;
      background: var(--brand-deep);
      color: #ffffff;
      font-weight: 700;
      box-shadow: 0 12px 28px rgba(47, 95, 85, 0.2);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      white-space: nowrap;
    }

    .nav-action:hover {
      transform: translateY(-2px);
      box-shadow: 0 16px 34px rgba(47, 95, 85, 0.26);
    }

    .menu-toggle {
      display: none;
      width: 42px;
      height: 42px;
      border: 1px solid var(--line);
      border-radius: 12px;
      background: var(--paper);
      color: var(--text);
      font-size: 20px;
      cursor: pointer;
    }

    main {
      overflow: hidden;
    }

    section {
      padding: 64px 0;
    }

    .hero {
      padding: 56px 0 42px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
      align-items: center;
      gap: 44px;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      border: 1px solid rgba(79, 125, 114, 0.18);
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.72);
      color: var(--brand-deep);
      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(215, 149, 85, 0.16);
    }

    h1 {
      margin: 22px 0 16px;
      max-width: 720px;
      font-size: clamp(34px, 7vw, 58px);
      line-height: 1.08;
      letter-spacing: 0;
      color: #1f2d2a;
    }

    .hero-text {
      max-width: 650px;
      margin: 0;
      color: #586762;
      font-size: 18px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px;
      margin-top: 30px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      min-height: 46px;
      padding: 12px 20px;
      border-radius: 999px;
      border: 1px solid transparent;
      font-weight: 800;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    }

    .btn-primary {
      background: var(--brand-deep);
      color: #ffffff;
      box-shadow: 0 14px 30px rgba(47, 95, 85, 0.22);
    }

    .btn-secondary {
      background: #ffffff;
      color: var(--brand-deep);
      border-color: var(--line);
    }

    .btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 14px 30px rgba(76, 88, 82, 0.16);
    }

    .hero-note {
      margin-top: 20px;
      color: var(--muted);
      font-size: 14px;
    }

    .device-panel {
      position: relative;
      padding: 18px;
      border-radius: 32px;
      background: linear-gradient(145deg, rgba(255,255,255,0.88), rgba(255,247,234,0.92));
      border: 1px solid rgba(234, 223, 206, 0.9);
      box-shadow: var(--shadow);
      animation: floatIn 0.8s ease both;
    }

    .device-frame {
      overflow: hidden;
      border-radius: 24px;
      background: var(--paper);
      border: 1px solid rgba(234, 223, 206, 0.78);
    }

    .device-frame img {
      width: 100%;
      aspect-ratio: 4 / 3;
      object-fit: contain;
      background: #fbf5ec;
    }

    .quick-card {
      margin-top: 14px;
      padding: 18px;
      border-radius: 20px;
      background: #ffffff;
      border: 1px solid rgba(234, 223, 206, 0.82);
    }

    .quick-card strong {
      display: block;
      color: #253531;
      margin-bottom: 8px;
      font-size: 18px;
    }

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

    .section-head {
      display: grid;
      grid-template-columns: minmax(0, 0.9fr) minmax(260px, 0.5fr);
      align-items: end;
      gap: 28px;
      margin-bottom: 28px;
    }

    .section-head h2 {
      margin: 0;
      font-size: clamp(26px, 4vw, 38px);
      line-height: 1.2;
      color: #24322f;
    }

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

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

    .service-item {
      padding: 22px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.82);
      border: 1px solid rgba(234, 223, 206, 0.9);
      box-shadow: 0 10px 28px rgba(73, 93, 86, 0.08);
      transition: transform 0.22s ease, border-color 0.22s ease;
    }

    .service-item:hover {
      transform: translateY(-4px);
      border-color: rgba(79, 125, 114, 0.36);
    }

    .service-icon {
      width: 38px;
      height: 38px;
      border-radius: 14px;
      display: grid;
      place-items: center;
      margin-bottom: 14px;
      background: #e6f0eb;
      color: var(--brand-deep);
      font-weight: 900;
    }

    .service-item h3 {
      margin: 0 0 8px;
      font-size: 18px;
      color: #253531;
    }

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

    .solution {
      padding-top: 50px;
    }

    .solution-board {
      display: grid;
      grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
      gap: 22px;
      align-items: stretch;
    }

    .diagnosis-card {
      padding: 28px;
      border-radius: 26px;
      background: var(--brand-deep);
      color: #ffffff;
      box-shadow: 0 18px 46px rgba(47, 95, 85, 0.24);
    }

    .diagnosis-card h2 {
      margin: 0 0 14px;
      font-size: 30px;
      line-height: 1.25;
      color: #ffffff;
    }

    .diagnosis-card p {
      margin: 0 0 20px;
      color: rgba(255, 255, 255, 0.86);
    }

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

    .check-list li {
      padding: 12px 14px;
      border-radius: 16px;
      background: rgba(255, 255, 255, 0.12);
      color: #ffffff;
    }

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

    .step {
      padding: 22px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.9);
      border: 1px solid rgba(234, 223, 206, 0.9);
    }

    .step span {
      display: inline-grid;
      place-items: center;
      width: 34px;
      height: 34px;
      margin-bottom: 12px;
      border-radius: 50%;
      background: var(--paper-warm);
      color: var(--accent);
      font-weight: 900;
    }

    .step h3 {
      margin: 0 0 8px;
      font-size: 18px;
    }

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

    .gallery {
      padding-top: 44px;
    }

    .gallery-row {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr 1fr;
      gap: 16px;
      align-items: stretch;
    }

    .photo-card {
      overflow: hidden;
      border-radius: 24px;
      background: #ffffff;
      border: 1px solid rgba(234, 223, 206, 0.9);
      box-shadow: 0 12px 32px rgba(73, 93, 86, 0.08);
    }

    .photo-card img {
      width: 100%;
      aspect-ratio: 4 / 3;
      object-fit: contain;
      background: #fbf5ec;
      transition: transform 0.35s ease;
    }

    .photo-card:hover img {
      transform: scale(1.03);
    }

    .photo-card p {
      margin: 0;
      padding: 14px 16px 16px;
      color: #53635f;
      font-size: 15px;
    }

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

    .warranty-card {
      padding: 22px;
      border-radius: 22px;
      background: linear-gradient(180deg, #ffffff, #fff8ee);
      border: 1px solid rgba(234, 223, 206, 0.95);
    }

    .warranty-card h3 {
      margin: 0 0 8px;
      font-size: 18px;
      color: #253531;
    }

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

    .contact-panel {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 280px;
      gap: 24px;
      align-items: center;
      padding: 30px;
      border-radius: 30px;
      background: #ffffff;
      border: 1px solid rgba(234, 223, 206, 0.9);
      box-shadow: var(--shadow);
    }

    .contact-info h2 {
      margin: 0 0 12px;
      font-size: clamp(26px, 4vw, 38px);
      line-height: 1.2;
    }

    .info-list {
      display: grid;
      gap: 10px;
      margin: 20px 0 0;
      padding: 0;
      list-style: none;
      color: #4d5d59;
    }

    .info-list strong {
      color: #253531;
    }

    .qr-box {
      padding: 16px;
      border-radius: 24px;
      background: var(--paper-warm);
      border: 1px solid var(--line);
      text-align: center;
    }

    .qr-box img {
      width: 210px;
      margin: 0 auto;
      border-radius: 16px;
      background: #ffffff;
    }

    .qr-box p {
      margin: 12px 0 0;
      color: #52625d;
      font-size: 14px;
    }

    .link-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
      margin-top: 18px;
    }

    .link-grid a {
      padding: 12px 14px;
      border-radius: 16px;
      background: #fff9ef;
      border: 1px solid rgba(234, 223, 206, 0.9);
      color: #365c54;
      font-size: 14px;
      transition: background 0.2s ease, transform 0.2s ease;
    }

    .link-grid a:hover {
      background: #e8f1ed;
      transform: translateY(-2px);
    }

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

    .faq-item {
      border: 1px solid rgba(234, 223, 206, 0.95);
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.88);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      padding: 18px 20px;
      border: 0;
      background: transparent;
      color: #253531;
      font: inherit;
      font-weight: 800;
      text-align: left;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 18px;
    }

    .faq-question span {
      flex: 1;
    }

    .faq-question::after {
      content: "+";
      width: 28px;
      height: 28px;
      border-radius: 50%;
      display: grid;
      place-items: center;
      background: #f1e7d8;
      color: var(--brand-deep);
      font-weight: 900;
      flex: 0 0 auto;
    }

    .faq-item.active .faq-question::after {
      content: "−";
    }

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

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

    .summary-band {
      padding: 28px;
      border-radius: 28px;
      background: linear-gradient(135deg, #e8f1ed, #fff3df);
      border: 1px solid rgba(234, 223, 206, 0.9);
    }

    .summary-band h2 {
      margin: 0 0 10px;
      font-size: 28px;
    }

    .summary-band p {
      margin: 0;
      color: #566762;
    }

    .alt-text {
      margin-top: 16px;
      padding: 16px;
      border-radius: 18px;
      background: rgba(255,255,255,0.7);
      border: 1px dashed rgba(79, 125, 114, 0.32);
      color: #5b6965;
      font-size: 14px;
    }

    .site-footer {
      margin-top: 0;
      padding: 28px 0;
      background: #f4eadc;
      border-top: 1px solid #e3d5c1;
      color: #384943;
    }

    .footer-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      flex-wrap: wrap;
      font-size: 14px;
    }

    .footer-links {
      display: flex;
      gap: 14px;
      flex-wrap: wrap;
    }

    .footer-links a {
      color: #365c54;
    }

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

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

    @keyframes floatIn {
      from {
        opacity: 0;
        transform: translateY(18px) scale(0.98);
      }
      to {
        opacity: 1;
        transform: translateY(0) scale(1);
      }
    }

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

      .nav {
        min-height: 66px;
      }

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

      .nav.open {
        align-items: flex-start;
        padding: 12px 0;
        flex-wrap: wrap;
      }

      .nav.open .nav-links {
        order: 3;
        width: 100%;
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
      }

      .nav.open .nav-action {
        order: 4;
        width: 100%;
        display: inline-flex;
      }

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

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

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

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

      section {
        padding: 44px 0;
      }

      .hero {
        padding-top: 38px;
      }

      .hero-actions {
        align-items: stretch;
      }

      .btn {
        width: 100%;
      }

      .service-strip,
      .step-grid,
      .warranty-grid,
      .gallery-row,
      .link-grid {
        grid-template-columns: 1fr;
      }

      .contact-panel {
        padding: 22px;
      }

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