:root {
      --bg: #f5f6f8;
      --bg-soft: #ffffff;
      --text: #1f2630;
      --muted: #667080;
      --line: #dfe3e8;
      --silver: #b9c1cc;
      --silver-dark: #7d8794;
      --accent: #365b7c;
      --accent-2: #edf2f7;
      --warm: #f7f4ef;
      --shadow: 0 18px 50px rgba(42, 52, 65, 0.08);
      --radius-lg: 28px;
      --radius-md: 18px;
      --container: 1180px;
    }

    * {
      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(191, 200, 212, 0.36), transparent 28%),
        radial-gradient(circle at 88% 18%, rgba(220, 225, 232, 0.55), transparent 30%),
        linear-gradient(180deg, #fafafa 0%, var(--bg) 42%, #f8f8f6 100%);
      line-height: 1.7;
      overflow-x: hidden;
    }

    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: 50;
      background: rgba(250, 251, 252, 0.86);
      backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(210, 216, 224, 0.78);
    }

    .nav {
      min-height: 72px;
      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: 0.08em;
      color: #1e2732;
      white-space: nowrap;
    }

    .logo-mark {
      width: 42px;
      height: 42px;
      border-radius: 15px;
      display: grid;
      place-items: center;
      background: linear-gradient(145deg, #ffffff, #cbd2dc);
      border: 1px solid #d7dde5;
      box-shadow: inset 0 1px 0 rgba(255,255,255,0.82), 0 10px 24px rgba(79, 90, 105, 0.12);
      color: #202833;
      font-size: 22px;
      font-weight: 900;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 24px;
      color: #465160;
      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;
      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;
      padding: 10px 18px;
      border-radius: 999px;
      color: #ffffff;
      background: linear-gradient(135deg, #27384a, #597087);
      box-shadow: 0 10px 22px rgba(54, 91, 124, 0.18);
      font-weight: 700;
      font-size: 14px;
      white-space: nowrap;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .nav-action:hover {
      transform: translateY(-2px);
      box-shadow: 0 16px 30px rgba(54, 91, 124, 0.24);
    }

    .menu-toggle {
      display: none;
      width: 42px;
      height: 42px;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: #ffffff;
      color: #202833;
      cursor: pointer;
      font-size: 22px;
    }

    main {
      position: relative;
    }

    .hero {
      padding: 58px 0 42px;
    }

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

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 9px;
      padding: 7px 13px;
      border: 1px solid #d6dde6;
      border-radius: 999px;
      background: rgba(255,255,255,0.72);
      color: #435060;
      font-size: 13px;
      font-weight: 700;
      box-shadow: 0 8px 24px rgba(90, 101, 116, 0.06);
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #7b8796;
      box-shadow: 0 0 0 5px rgba(123, 135, 150, 0.14);
    }

    h1 {
      margin: 20px 0 16px;
      font-size: clamp(34px, 6vw, 58px);
      line-height: 1.12;
      letter-spacing: -0.04em;
      color: #151b23;
    }

    .hero-lead {
      max-width: 720px;
      margin: 0;
      font-size: 18px;
      color: #546171;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 26px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      min-height: 46px;
      padding: 12px 20px;
      border-radius: 14px;
      border: 1px solid transparent;
      font-weight: 800;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    }

    .btn-primary {
      color: #ffffff;
      background: linear-gradient(135deg, #253544, #607588);
      box-shadow: 0 16px 32px rgba(45, 64, 82, 0.2);
    }

    .btn-secondary {
      color: #283443;
      background: rgba(255,255,255,0.76);
      border-color: #d8dee6;
    }

    .btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 16px 30px rgba(68, 81, 96, 0.16);
    }

    .hero-note {
      margin-top: 18px;
      color: #687586;
      font-size: 14px;
    }

    .phone-showcase {
      position: relative;
      padding: 18px;
      border: 1px solid rgba(210, 216, 224, 0.95);
      border-radius: 34px;
      background:
        linear-gradient(145deg, rgba(255,255,255,0.9), rgba(235,238,243,0.9));
      box-shadow: var(--shadow);
      overflow: hidden;
      animation: floatIn 0.8s ease both;
    }

    .phone-showcase::before {
      content: "";
      position: absolute;
      width: 220px;
      height: 220px;
      right: -70px;
      top: -70px;
      background: radial-gradient(circle, rgba(164, 174, 188, 0.38), transparent 68%);
      pointer-events: none;
    }

    .phone-stack {
      display: grid;
      grid-template-columns: 1fr 0.72fr;
      gap: 14px;
      position: relative;
      z-index: 1;
    }

    .phone-image {
      border-radius: 24px;
      overflow: hidden;
      background: #eef1f5;
      border: 1px solid rgba(214, 219, 226, 0.9);
      min-height: 180px;
    }

    .phone-image.main {
      grid-row: span 2;
      aspect-ratio: 4 / 5;
    }

    .phone-image.small {
      aspect-ratio: 1 / 1;
    }

    .phone-image img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .status-strip {
      margin-top: 14px;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
    }

    .status-item {
      padding: 12px;
      border-radius: 16px;
      background: rgba(255,255,255,0.74);
      border: 1px solid rgba(218, 223, 230, 0.9);
      color: #354050;
      font-size: 13px;
    }

    .status-item strong {
      display: block;
      color: #17202b;
      font-size: 16px;
      margin-bottom: 2px;
    }

    section {
      padding: 44px 0;
    }

    .section-head {
      max-width: 760px;
      margin-bottom: 24px;
    }

    .section-kicker {
      margin: 0 0 8px;
      color: var(--accent);
      font-size: 14px;
      font-weight: 900;
      letter-spacing: 0.08em;
    }

    h2 {
      margin: 0;
      font-size: clamp(26px, 4vw, 40px);
      line-height: 1.22;
      letter-spacing: -0.03em;
      color: #17202b;
    }

    .section-desc {
      margin: 12px 0 0;
      color: #5d6978;
      font-size: 16px;
    }

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

    .service-card {
      min-height: 172px;
      padding: 20px;
      border-radius: 22px;
      background: rgba(255,255,255,0.78);
      border: 1px solid #dfe4ea;
      box-shadow: 0 10px 30px rgba(59, 72, 88, 0.06);
      transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
    }

    .service-card:hover {
      transform: translateY(-5px);
      border-color: #c4ccd6;
      box-shadow: 0 18px 42px rgba(59, 72, 88, 0.12);
    }

    .icon-dot {
      width: 38px;
      height: 38px;
      border-radius: 14px;
      margin-bottom: 14px;
      display: grid;
      place-items: center;
      background: linear-gradient(145deg, #eef2f6, #ffffff);
      border: 1px solid #dbe1e8;
      color: #33485e;
      font-weight: 900;
    }

    h3 {
      margin: 0 0 8px;
      font-size: 18px;
      line-height: 1.35;
      color: #202936;
    }

    .service-card p,
    .solution-card p,
    .warranty-card p,
    .faq-answer,
    .contact-card p {
      margin: 0;
      color: #606d7d;
      font-size: 15px;
    }

    .solution-panel {
      display: grid;
      grid-template-columns: 0.82fr 1.18fr;
      gap: 20px;
      align-items: stretch;
    }

    .diagnosis-card {
      padding: 26px;
      border-radius: var(--radius-lg);
      background:
        linear-gradient(145deg, rgba(41, 54, 68, 0.96), rgba(91, 108, 126, 0.92));
      color: #ffffff;
      box-shadow: var(--shadow);
    }

    .diagnosis-card h2,
    .diagnosis-card h3 {
      color: #ffffff;
    }

    .diagnosis-card p {
      color: rgba(255,255,255,0.82);
      margin: 12px 0 0;
    }

    .steps {
      margin: 22px 0 0;
      padding: 0;
      list-style: none;
      display: grid;
      gap: 12px;
    }

    .steps li {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      padding: 13px;
      border-radius: 16px;
      background: rgba(255,255,255,0.1);
      border: 1px solid rgba(255,255,255,0.16);
      color: rgba(255,255,255,0.9);
      font-size: 15px;
    }

    .step-num {
      flex: 0 0 auto;
      width: 26px;
      height: 26px;
      border-radius: 50%;
      display: grid;
      place-items: center;
      background: rgba(255,255,255,0.18);
      color: #ffffff;
      font-weight: 900;
      font-size: 13px;
    }

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

    .solution-card {
      padding: 20px;
      border-radius: 22px;
      background: rgba(255,255,255,0.78);
      border: 1px solid #dfe4ea;
      box-shadow: 0 10px 30px rgba(59, 72, 88, 0.05);
    }

    .warranty-wrap {
      padding: 24px;
      border-radius: 30px;
      background: rgba(255,255,255,0.62);
      border: 1px solid #dfe4ea;
      box-shadow: var(--shadow);
    }

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

    .warranty-card {
      padding: 18px;
      border-radius: 20px;
      background: linear-gradient(180deg, #ffffff, #f3f5f8);
      border: 1px solid #dfe4ea;
    }

    .warranty-card strong {
      display: inline-flex;
      margin-bottom: 8px;
      color: #17202b;
      font-size: 17px;
    }

    .notice {
      margin-top: 16px;
      padding: 16px 18px;
      border-radius: 18px;
      background: #f7f4ef;
      border: 1px solid #e7ded2;
      color: #5c5144;
      font-size: 14px;
    }

    .contact-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 20px;
      align-items: stretch;
    }

    .contact-card {
      padding: 26px;
      border-radius: var(--radius-lg);
      background: rgba(255,255,255,0.82);
      border: 1px solid #dfe4ea;
      box-shadow: var(--shadow);
    }

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

    .info-list li {
      display: grid;
      grid-template-columns: 90px 1fr;
      gap: 12px;
      padding: 12px 0;
      border-bottom: 1px solid #edf0f3;
      color: #273241;
    }

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

    .info-list span {
      color: #6d7785;
      font-weight: 700;
    }

    .qr-box {
      display: grid;
      grid-template-columns: 148px 1fr;
      gap: 18px;
      align-items: center;
      margin-top: 20px;
      padding: 16px;
      border-radius: 22px;
      background: #f3f6f9;
      border: 1px solid #dfe4ea;
    }

    .qr-box img {
      width: 148px;
      aspect-ratio: 1 / 1;
      object-fit: contain;
      border-radius: 16px;
      background: #ffffff;
      border: 1px solid #dde3eb;
    }

    .map-link {
      color: #255d91;
      font-weight: 800;
      text-decoration: none;
    }

    .map-link:hover {
      text-decoration: underline;
    }

    .related-links {
      display: grid;
      gap: 10px;
      margin-top: 16px;
    }

    .related-links a {
      padding: 12px 14px;
      border-radius: 14px;
      background: #f4f6f8;
      border: 1px solid #e0e5eb;
      color: #334151;
      font-size: 14px;
      transition: background 0.2s ease, transform 0.2s ease;
    }

    .related-links a:hover {
      background: #ffffff;
      transform: translateX(3px);
    }

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

    .faq-item {
      border-radius: 20px;
      background: rgba(255,255,255,0.78);
      border: 1px solid #dfe4ea;
      overflow: hidden;
      box-shadow: 0 8px 24px rgba(59, 72, 88, 0.05);
    }

    .faq-question {
      width: 100%;
      border: 0;
      background: transparent;
      color: #202936;
      padding: 18px 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      text-align: left;
      cursor: pointer;
      font-size: 16px;
      font-weight: 850;
    }

    .faq-question span:last-child {
      width: 28px;
      height: 28px;
      flex: 0 0 auto;
      border-radius: 50%;
      display: grid;
      place-items: center;
      background: #eef2f6;
      color: #566273;
      transition: transform 0.2s ease;
    }

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

    .faq-answer {
      display: none;
      padding: 0 20px 18px;
      color: #606d7d;
    }

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

    .final-cta {
      padding: 24px;
      border-radius: 32px;
      background:
        linear-gradient(135deg, rgba(255,255,255,0.88), rgba(232,236,241,0.88)),
        radial-gradient(circle at 88% 20%, rgba(181, 190, 202, 0.42), transparent 36%);
      border: 1px solid #dce2e9;
      box-shadow: var(--shadow);
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 18px;
    }

    .final-cta h2 {
      font-size: clamp(24px, 3.5vw, 34px);
    }

    .site-footer {
      margin-top: 8px;
      padding: 26px 0;
      background: #eef1f4;
      border-top: 1px solid #dce2e8;
      color: #2d3642;
    }

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

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

    .footer-links a {
      color: #34475c;
      font-weight: 700;
    }

    .reveal {
      opacity: 0;
      transform: translateY(18px);
      transition: opacity 0.62s ease, transform 0.62s ease;
    }

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

    @keyframes floatIn {
      from {
        opacity: 0;
        transform: translateY(16px) scale(0.98);
      }
      to {
        opacity: 1;
        transform: translateY(0) scale(1);
      }
    }

    @media (max-width: 980px) {
      .hero-grid,
      .solution-panel,
      .contact-grid {
        grid-template-columns: 1fr;
      }

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

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

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

      .nav.open {
        align-items: flex-start;
        flex-wrap: wrap;
        padding: 15px 0;
      }

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

      .nav.open .nav-links a {
        padding: 12px;
        border-radius: 12px;
        background: #ffffff;
        border: 1px solid #e1e6ec;
      }

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

    @media (max-width: 680px) {
      .container {
        width: min(var(--container), calc(100% - 28px));
      }

      .hero {
        padding: 36px 0 28px;
      }

      section {
        padding: 34px 0;
      }

      .service-grid,
      .solution-list,
      .warranty-grid,
      .status-strip {
        grid-template-columns: 1fr;
      }

      .phone-stack {
        grid-template-columns: 1fr;
      }

      .phone-image.main {
        grid-row: auto;
        aspect-ratio: 4 / 3;
      }

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

      .qr-box img {
        width: 160px;
      }

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

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

      .hero-actions {
        flex-direction: column;
      }

      .btn {
        width: 100%;
      }
    }