:root {
      --bg: #f4f6f8;
      --bg-soft: #eef2f5;
      --card: rgba(255, 255, 255, 0.86);
      --card-solid: #ffffff;
      --text: #1e2933;
      --muted: #607080;
      --line: #d8e0e8;
      --brand: #6e7f92;
      --brand-dark: #40566d;
      --brand-soft: #dfe7ee;
      --accent: #a78b62;
      --shadow: 0 18px 45px rgba(69, 86, 105, 0.12);
      --shadow-soft: 0 10px 26px rgba(80, 96, 115, 0.09);
      --radius-lg: 28px;
      --radius-md: 18px;
      --radius-sm: 12px;
      --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 12% 8%, rgba(210, 220, 230, 0.9) 0, rgba(210, 220, 230, 0) 32%),
        radial-gradient(circle at 84% 18%, rgba(233, 226, 213, 0.85) 0, rgba(233, 226, 213, 0) 30%),
        linear-gradient(135deg, #f8fafb 0%, #eef3f6 42%, #f6f1e9 100%);
      line-height: 1.7;
      overflow-x: hidden;
    }

    body::before {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      background-image:
        linear-gradient(rgba(64, 86, 109, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(64, 86, 109, 0.035) 1px, transparent 1px);
      background-size: 38px 38px;
      mask-image: linear-gradient(to bottom, rgba(0,0,0,0.55), rgba(0,0,0,0.08));
      z-index: -1;
    }

    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: 30;
      background: rgba(248, 250, 251, 0.78);
      backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(216, 224, 232, 0.8);
    }

    .nav {
      min-height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 22px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      flex: 0 0 auto;
      color: var(--brand-dark);
      font-weight: 800;
      letter-spacing: 0.08em;
    }

    .brand-mark {
      width: 42px;
      height: 42px;
      border-radius: 16px;
      display: grid;
      place-items: center;
      color: #ffffff;
      background: linear-gradient(135deg, #4f6479, #9aa8b5 58%, #c5b391);
      box-shadow: 0 10px 22px rgba(64, 86, 109, 0.2);
      font-size: 22px;
    }

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

    .brand-text span:last-child {
      font-size: 12px;
      color: var(--muted);
      font-weight: 600;
      letter-spacing: 0.04em;
      margin-top: 4px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 6px;
      flex: 1 1 auto;
    }

    .nav-links a {
      padding: 9px 12px;
      border-radius: 999px;
      color: #354557;
      font-size: 14px;
      transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
      white-space: nowrap;
    }

    .nav-links a:hover {
      background: rgba(223, 231, 238, 0.8);
      color: var(--brand-dark);
      transform: translateY(-1px);
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 40px;
      padding: 0 16px;
      border-radius: 999px;
      background: #2f4052;
      color: #ffffff;
      font-size: 14px;
      font-weight: 700;
      box-shadow: 0 12px 24px rgba(47, 64, 82, 0.16);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      white-space: nowrap;
    }

    .nav-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 16px 30px rgba(47, 64, 82, 0.22);
    }

    .menu-toggle {
      display: none;
      width: 42px;
      height: 42px;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: rgba(255,255,255,0.82);
      color: var(--brand-dark);
      cursor: pointer;
    }

    .menu-toggle span {
      display: block;
      width: 18px;
      height: 2px;
      margin: 4px auto;
      background: currentColor;
      border-radius: 2px;
    }

    main {
      background:
        linear-gradient(180deg, rgba(255,255,255,0.12), rgba(255,255,255,0.38)),
        radial-gradient(circle at 74% 34%, rgba(199, 211, 224, 0.28), transparent 36%);
    }

    section {
      padding: 52px 0;
    }

    .hero {
      padding: 66px 0 46px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
      align-items: center;
      gap: 34px;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      border: 1px solid rgba(110, 127, 146, 0.22);
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.7);
      color: #52677c;
      font-size: 13px;
      font-weight: 700;
      box-shadow: 0 8px 22px rgba(80, 96, 115, 0.06);
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #9bb0c1;
      box-shadow: 0 0 0 5px rgba(155, 176, 193, 0.18);
    }

    h1 {
      margin: 20px 0 16px;
      font-size: clamp(34px, 6vw, 58px);
      line-height: 1.08;
      letter-spacing: -0.04em;
      color: #1b2631;
    }

    .hero-lead {
      max-width: 680px;
      margin: 0 0 24px;
      color: #4e5f70;
      font-size: 17px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      align-items: center;
      margin-top: 26px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      min-height: 46px;
      padding: 0 20px;
      border-radius: 999px;
      font-weight: 800;
      border: 1px solid transparent;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    }

    .btn-primary {
      background: linear-gradient(135deg, #31475c, #687d91);
      color: #ffffff;
      box-shadow: 0 16px 32px rgba(49, 71, 92, 0.22);
    }

    .btn-secondary {
      background: rgba(255, 255, 255, 0.72);
      color: #31475c;
      border-color: rgba(110, 127, 146, 0.24);
    }

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

    .hero-note {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 24px;
      color: #667586;
      font-size: 14px;
    }

    .hero-note span {
      padding: 6px 10px;
      border-radius: 999px;
      background: rgba(255,255,255,0.62);
      border: 1px solid rgba(216, 224, 232, 0.9);
    }

    .visual-panel {
      position: relative;
      padding: 18px;
      border-radius: 34px;
      background: linear-gradient(145deg, rgba(255,255,255,0.72), rgba(235,241,246,0.82));
      border: 1px solid rgba(255,255,255,0.84);
      box-shadow: var(--shadow);
      overflow: hidden;
    }

    .visual-panel::before {
      content: "";
      position: absolute;
      width: 220px;
      height: 220px;
      border-radius: 50%;
      right: -80px;
      top: -70px;
      background: radial-gradient(circle, rgba(197,179,145,0.36), rgba(197,179,145,0));
      animation: floatGlow 6s ease-in-out infinite alternate;
    }

    .device-card {
      position: relative;
      z-index: 1;
      border-radius: 26px;
      overflow: hidden;
      background: #f8fafb;
      border: 1px solid rgba(216,224,232,0.9);
    }

    .device-card img {
      width: 100%;
      aspect-ratio: 4 / 3;
      object-fit: cover;
    }

    .diagnose-strip {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      margin-top: 14px;
    }

    .mini-metric {
      padding: 14px 12px;
      border-radius: 18px;
      background: rgba(255,255,255,0.76);
      border: 1px solid rgba(216,224,232,0.86);
    }

    .mini-metric strong {
      display: block;
      color: #26384a;
      font-size: 16px;
      margin-bottom: 3px;
    }

    .mini-metric span {
      display: block;
      color: var(--muted);
      font-size: 12px;
      line-height: 1.45;
    }

    .section-head {
      display: grid;
      grid-template-columns: minmax(0, 0.72fr) minmax(260px, 0.28fr);
      align-items: end;
      gap: 24px;
      margin-bottom: 24px;
    }

    .section-kicker {
      color: var(--accent);
      font-size: 13px;
      font-weight: 900;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      margin-bottom: 8px;
    }

    h2 {
      margin: 0;
      font-size: clamp(25px, 4vw, 38px);
      line-height: 1.22;
      letter-spacing: -0.03em;
      color: #1f2d3b;
    }

    .section-desc {
      margin: 0;
      color: #647386;
      font-size: 15px;
    }

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

    .service-card {
      min-height: 100%;
      padding: 24px;
      border-radius: var(--radius-lg);
      background: rgba(255,255,255,0.78);
      border: 1px solid rgba(216,224,232,0.88);
      box-shadow: var(--shadow-soft);
      transition: transform 0.24s ease, box-shadow 0.24s ease, border-color 0.24s ease;
    }

    .service-card:hover {
      transform: translateY(-5px);
      border-color: rgba(110,127,146,0.38);
      box-shadow: 0 18px 38px rgba(80, 96, 115, 0.14);
    }

    .service-icon {
      width: 42px;
      height: 42px;
      border-radius: 16px;
      display: grid;
      place-items: center;
      background: linear-gradient(135deg, #e7edf2, #ffffff);
      color: var(--brand-dark);
      font-weight: 900;
      margin-bottom: 16px;
      border: 1px solid rgba(216,224,232,0.85);
    }

    h3 {
      margin: 0 0 10px;
      font-size: 19px;
      line-height: 1.35;
      color: #263545;
    }

    .service-card p,
    .solution-text p,
    .guarantee-card p {
      margin: 0;
      color: #5f6f80;
      font-size: 15px;
    }

    .solution-wrap {
      display: grid;
      grid-template-columns: minmax(0, 0.95fr) minmax(300px, 1.05fr);
      gap: 18px;
      align-items: stretch;
    }

    .solution-text {
      padding: 28px;
      border-radius: var(--radius-lg);
      background: linear-gradient(145deg, rgba(255,255,255,0.82), rgba(238,244,248,0.82));
      border: 1px solid rgba(216,224,232,0.9);
      box-shadow: var(--shadow-soft);
    }

    .signal-list {
      display: grid;
      gap: 10px;
      margin: 20px 0 0;
      padding: 0;
      list-style: none;
    }

    .signal-list li {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      padding: 12px 14px;
      border-radius: 16px;
      background: rgba(255,255,255,0.7);
      border: 1px solid rgba(216,224,232,0.78);
      color: #405064;
      font-size: 14px;
    }

    .signal-list li::before {
      content: "";
      flex: 0 0 auto;
      width: 9px;
      height: 9px;
      border-radius: 50%;
      margin-top: 8px;
      background: #8ea0b2;
    }

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

    .step-item {
      display: grid;
      grid-template-columns: 46px minmax(0, 1fr);
      gap: 14px;
      align-items: start;
      padding: 18px;
      border-radius: 22px;
      background: rgba(255,255,255,0.78);
      border: 1px solid rgba(216,224,232,0.88);
      box-shadow: 0 8px 20px rgba(80,96,115,0.06);
    }

    .step-num {
      width: 46px;
      height: 46px;
      border-radius: 18px;
      display: grid;
      place-items: center;
      background: #eef3f6;
      color: #40566d;
      font-weight: 900;
      border: 1px solid rgba(216,224,232,0.9);
    }

    .step-item strong {
      display: block;
      color: #263545;
      margin-bottom: 4px;
      font-size: 16px;
    }

    .step-item span {
      display: block;
      color: #647386;
      font-size: 14px;
    }

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

    .gallery-card {
      overflow: hidden;
      border-radius: var(--radius-lg);
      background: var(--card-solid);
      border: 1px solid rgba(216,224,232,0.88);
      box-shadow: var(--shadow-soft);
    }

    .gallery-card img {
      width: 100%;
      aspect-ratio: 16 / 10;
      object-fit: cover;
    }

    .gallery-card.small img {
      aspect-ratio: 16 / 12;
    }

    .gallery-caption {
      padding: 15px 16px 17px;
      color: #526275;
      font-size: 14px;
    }

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

    .guarantee-card {
      padding: 22px;
      border-radius: 24px;
      background: rgba(255,255,255,0.74);
      border: 1px solid rgba(216,224,232,0.9);
      box-shadow: var(--shadow-soft);
    }

    .guarantee-card strong {
      display: block;
      margin-bottom: 8px;
      color: #273747;
      font-size: 17px;
    }

    .contact-panel {
      display: grid;
      grid-template-columns: minmax(0, 0.94fr) minmax(300px, 1.06fr);
      gap: 18px;
      align-items: stretch;
      padding: 18px;
      border-radius: 34px;
      background: linear-gradient(145deg, rgba(255,255,255,0.78), rgba(232,239,245,0.82));
      border: 1px solid rgba(255,255,255,0.9);
      box-shadow: var(--shadow);
    }

    .contact-card,
    .links-card {
      padding: 24px;
      border-radius: 26px;
      background: rgba(255,255,255,0.8);
      border: 1px solid rgba(216,224,232,0.86);
    }

    .info-list {
      display: grid;
      gap: 12px;
      margin: 18px 0 0;
    }

    .info-row {
      display: grid;
      grid-template-columns: 88px minmax(0, 1fr);
      gap: 12px;
      padding: 12px 0;
      border-bottom: 1px solid rgba(216,224,232,0.8);
      color: #415266;
      font-size: 15px;
    }

    .info-row:last-child {
      border-bottom: 0;
    }

    .info-row strong {
      color: #263545;
    }

    .policy-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 10px;
      margin: 16px 0 0;
      padding: 0;
      list-style: none;
    }

    .policy-list li {
      padding: 12px 14px;
      border-radius: 16px;
      background: rgba(244,247,249,0.9);
      color: #4c5e70;
      font-size: 14px;
      border: 1px solid rgba(216,224,232,0.82);
    }

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

    .resource-links a {
      padding: 12px 14px;
      border-radius: 16px;
      background: rgba(244,247,249,0.88);
      border: 1px solid rgba(216,224,232,0.86);
      color: #38506a;
      font-size: 14px;
      transition: background 0.2s ease, transform 0.2s ease;
    }

    .resource-links a:hover {
      background: #ffffff;
      transform: translateY(-2px);
    }

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

    .faq-item {
      border-radius: 20px;
      background: rgba(255,255,255,0.78);
      border: 1px solid rgba(216,224,232,0.88);
      box-shadow: 0 8px 18px rgba(80,96,115,0.06);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      border: 0;
      background: transparent;
      padding: 18px 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      text-align: left;
      color: #263545;
      font-size: 16px;
      font-weight: 800;
      cursor: pointer;
    }

    .faq-question span {
      flex: 1 1 auto;
    }

    .faq-question i {
      width: 26px;
      height: 26px;
      border-radius: 50%;
      display: grid;
      place-items: center;
      flex: 0 0 auto;
      background: #eef3f6;
      color: #40566d;
      font-style: normal;
      transition: transform 0.22s ease;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.28s ease;
    }

    .faq-answer p {
      margin: 0;
      padding: 0 20px 18px;
      color: #5f6f80;
      font-size: 15px;
    }

    .faq-item.active .faq-answer {
      max-height: 220px;
    }

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

    .summary-box {
      margin-top: 18px;
      padding: 24px;
      border-radius: 26px;
      background: linear-gradient(135deg, rgba(49,71,92,0.92), rgba(104,125,145,0.88));
      color: #ffffff;
      box-shadow: 0 18px 36px rgba(49,71,92,0.18);
    }

    .summary-box h2 {
      color: #ffffff;
      font-size: clamp(24px, 4vw, 34px);
      margin-bottom: 10px;
    }

    .summary-box p {
      margin: 0 0 18px;
      color: rgba(255,255,255,0.88);
    }

    .summary-box .btn-secondary {
      background: rgba(255,255,255,0.14);
      color: #ffffff;
      border-color: rgba(255,255,255,0.28);
    }

    .site-footer {
      background: #edf2f5;
      color: #2b3a48;
      border-top: 1px solid rgba(216,224,232,0.95);
      padding: 26px 0;
    }

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

    .footer-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      color: #263545;
    }

    .footer-brand .brand-mark {
      width: 34px;
      height: 34px;
      border-radius: 13px;
      font-size: 18px;
      box-shadow: none;
    }

    .footer-links {
      display: flex;
      flex-wrap: wrap;
      justify-content: flex-end;
      gap: 12px;
      color: #526275;
      font-size: 14px;
    }

    .footer-links a {
      color: #38506a;
    }

    .reveal {
      opacity: 0;
      transform: translateY(16px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }

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

    @keyframes floatGlow {
      from {
        transform: translate3d(0, 0, 0) scale(1);
        opacity: 0.72;
      }
      to {
        transform: translate3d(-18px, 24px, 0) scale(1.08);
        opacity: 0.95;
      }
    }

    @media (max-width: 980px) {
      .nav {
        min-height: 66px;
      }

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

      .nav-links {
        position: absolute;
        left: 16px;
        right: 16px;
        top: 74px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        padding: 14px;
        border-radius: 22px;
        background: rgba(255,255,255,0.96);
        border: 1px solid rgba(216,224,232,0.95);
        box-shadow: var(--shadow);
      }

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

      .nav-links a {
        text-align: center;
      }

      .nav-cta {
        display: none;
      }

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

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

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

    @media (max-width: 680px) {
      .container {
        width: min(100% - 24px, var(--container));
      }

      section {
        padding: 38px 0;
      }

      .hero {
        padding-top: 42px;
      }

      .hero-grid {
        gap: 22px;
      }

      .visual-panel,
      .contact-panel {
        border-radius: 26px;
        padding: 12px;
      }

      .diagnose-strip,
      .service-grid,
      .guarantee-grid,
      .policy-list,
      .resource-links {
        grid-template-columns: 1fr;
      }

      .service-card,
      .solution-text,
      .contact-card,
      .links-card,
      .guarantee-card {
        padding: 20px;
      }

      .step-item {
        grid-template-columns: 40px minmax(0, 1fr);
        padding: 15px;
      }

      .step-num {
        width: 40px;
        height: 40px;
        border-radius: 15px;
      }

      .info-row {
        grid-template-columns: 1fr;
        gap: 3px;
      }

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

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