:root {
      --bg: #f6fbff;
      --bg-soft: #eef8ff;
      --panel: rgba(255, 255, 255, 0.86);
      --panel-solid: #ffffff;
      --text: #17212b;
      --muted: #5d6b78;
      --line: #dcebf5;
      --ice: #76c8ff;
      --ice-deep: #2487c9;
      --mint: #9be6dc;
      --navy: #102438;
      --shadow: 0 18px 50px rgba(38, 110, 160, 0.12);
      --radius-lg: 28px;
      --radius-md: 20px;
      --radius-sm: 14px;
      --container: 1160px;
      --pad-x: 20px;
    }

    * {
      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(118, 200, 255, 0.22), transparent 34%),
        radial-gradient(circle at 86% 18%, rgba(155, 230, 220, 0.24), transparent 32%),
        linear-gradient(180deg, #f8fcff 0%, #f3faff 44%, #f7fbfd 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% - var(--pad-x) * 2));
      margin: 0 auto;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(248, 252, 255, 0.82);
      backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(196, 224, 241, 0.7);
    }

    .nav-wrap {
      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;
    }

    .logo {
      width: 42px;
      height: 42px;
      border-radius: 14px;
      display: grid;
      place-items: center;
      font-weight: 800;
      font-size: 22px;
      color: #0d3856;
      background: linear-gradient(145deg, #ffffff, #cceeff);
      box-shadow: inset 0 1px 0 rgba(255,255,255,0.9), 0 10px 22px rgba(76, 162, 214, 0.18);
      border: 1px solid rgba(151, 209, 241, 0.8);
    }

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

    .brand-text strong {
      font-size: 16px;
      letter-spacing: 0.04em;
      color: var(--navy);
    }

    .brand-text span {
      font-size: 12px;
      color: var(--muted);
    }

    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 4px;
      flex: 1 1 auto;
    }

    .nav-links a {
      padding: 10px 12px;
      border-radius: 999px;
      color: #33485a;
      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(222, 243, 255, 0.9);
      color: var(--ice-deep);
      transform: translateY(-1px);
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 40px;
      padding: 10px 16px;
      border-radius: 999px;
      color: #ffffff;
      background: linear-gradient(135deg, #2083c4, #43bfd0);
      box-shadow: 0 12px 26px rgba(32, 131, 196, 0.2);
      font-size: 14px;
      font-weight: 700;
      white-space: nowrap;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .nav-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 16px 32px rgba(32, 131, 196, 0.26);
    }

    .menu-toggle {
      display: none;
      width: 42px;
      height: 42px;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: #ffffff;
      color: var(--navy);
      cursor: pointer;
      align-items: center;
      justify-content: center;
      gap: 4px;
      flex-direction: column;
    }

    .menu-toggle span {
      width: 18px;
      height: 2px;
      border-radius: 2px;
      background: currentColor;
      transition: transform 0.2s ease, opacity 0.2s ease;
    }

    main {
      position: relative;
    }

    .section {
      padding: 54px 0;
    }

    .hero {
      padding: 58px 0 48px;
      position: relative;
    }

    .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: 8px;
      padding: 7px 12px;
      border-radius: 999px;
      background: rgba(232, 247, 255, 0.92);
      color: #276f9f;
      border: 1px solid rgba(159, 218, 249, 0.9);
      font-size: 13px;
      font-weight: 700;
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #43bfd0;
      box-shadow: 0 0 0 5px rgba(67, 191, 208, 0.15);
    }

    h1 {
      margin: 18px 0 16px;
      font-size: clamp(34px, 6vw, 56px);
      line-height: 1.08;
      letter-spacing: -0.05em;
      color: #102438;
    }

    .hero-lead {
      max-width: 690px;
      margin: 0;
      color: #4b5f70;
      font-size: 17px;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      min-height: 46px;
      padding: 12px 18px;
      border-radius: 999px;
      border: 1px solid transparent;
      font-weight: 800;
      font-size: 15px;
      cursor: pointer;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    }

    .btn-primary {
      color: #ffffff;
      background: linear-gradient(135deg, #157fc2, #55cbd4);
      box-shadow: 0 16px 32px rgba(21, 127, 194, 0.2);
    }

    .btn-secondary {
      color: #17405c;
      background: rgba(255, 255, 255, 0.86);
      border-color: rgba(173, 220, 244, 0.95);
    }

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

    .btn-primary:hover {
      box-shadow: 0 20px 38px rgba(21, 127, 194, 0.26);
    }

    .hero-note {
      margin-top: 18px;
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      color: var(--muted);
      font-size: 13px;
    }

    .hero-note span {
      padding: 6px 10px;
      border-radius: 999px;
      background: rgba(255,255,255,0.72);
      border: 1px solid rgba(213, 235, 247, 0.9);
    }

    .ice-panel {
      position: relative;
      padding: 18px;
      border-radius: 34px;
      background: linear-gradient(145deg, rgba(255,255,255,0.92), rgba(234,247,255,0.82));
      border: 1px solid rgba(196, 230, 249, 0.95);
      box-shadow: var(--shadow);
      overflow: hidden;
    }

    .ice-panel::before {
      content: "";
      position: absolute;
      inset: -50% -40% auto auto;
      width: 220px;
      height: 220px;
      background: radial-gradient(circle, rgba(118, 200, 255, 0.32), transparent 70%);
      animation: floatGlow 8s ease-in-out infinite alternate;
      pointer-events: none;
    }

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

    .phone-shot {
      aspect-ratio: 4 / 5;
      border-radius: 24px;
      background: #f4fbff;
      border: 1px solid rgba(214, 236, 248, 0.95);
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 8px;
      overflow: hidden;
    }

    .phone-shot img {
      max-height: 100%;
      object-fit: contain;
      border-radius: 18px;
    }

    .diagnosis-strip {
      position: relative;
      z-index: 2;
      margin-top: 14px;
      padding: 16px;
      border-radius: 22px;
      background: rgba(255,255,255,0.88);
      border: 1px solid rgba(207, 232, 246, 0.95);
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
    }

    .diagnosis-strip b {
      display: block;
      color: #14334b;
      font-size: 15px;
    }

    .diagnosis-strip span {
      display: block;
      margin-top: 2px;
      color: var(--muted);
      font-size: 12px;
    }

    .section-head {
      display: grid;
      grid-template-columns: minmax(0, 0.86fr) minmax(260px, 0.54fr);
      gap: 24px;
      align-items: end;
      margin-bottom: 24px;
    }

    .section-head h2 {
      margin: 8px 0 0;
      font-size: clamp(26px, 4vw, 38px);
      line-height: 1.18;
      letter-spacing: -0.035em;
      color: #12283a;
    }

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

    .anchor-card {
      padding: 18px;
      border-radius: var(--radius-md);
      background: rgba(255,255,255,0.76);
      border: 1px solid rgba(207, 232, 246, 0.9);
      box-shadow: 0 12px 34px rgba(38, 110, 160, 0.08);
    }

    .anchor-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .anchor-list a {
      padding: 8px 12px;
      border-radius: 999px;
      background: #f1f9fe;
      border: 1px solid #d8edf8;
      color: #255a7b;
      font-size: 14px;
      transition: background 0.2s ease, transform 0.2s ease;
    }

    .anchor-list a:hover {
      background: #e1f4ff;
      transform: translateY(-1px);
    }

    .reason-grid {
      display: grid;
      grid-template-columns: repeat(5, minmax(0, 1fr));
      gap: 14px;
    }

    .reason-card {
      padding: 18px;
      border-radius: 22px;
      background: var(--panel);
      border: 1px solid rgba(211, 234, 247, 0.92);
      box-shadow: 0 12px 30px rgba(38, 110, 160, 0.07);
      transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
    }

    .reason-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 18px 40px rgba(38, 110, 160, 0.13);
      border-color: rgba(121, 202, 245, 0.9);
    }

    .reason-card .icon {
      width: 38px;
      height: 38px;
      border-radius: 14px;
      display: grid;
      place-items: center;
      color: #0f709f;
      background: linear-gradient(145deg, #edf9ff, #ffffff);
      border: 1px solid #d6edf9;
      font-weight: 900;
      margin-bottom: 12px;
    }

    .reason-card h3 {
      margin: 0 0 8px;
      font-size: 17px;
      color: #142c3e;
    }

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

    .service-layout {
      display: grid;
      grid-template-columns: minmax(0, 0.9fr) minmax(300px, 0.48fr);
      gap: 18px;
      align-items: start;
    }

    .service-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 14px;
    }

    .service-item {
      padding: 18px 18px 16px;
      border-radius: 22px;
      background: #ffffff;
      border: 1px solid rgba(212, 235, 248, 0.95);
      box-shadow: 0 12px 30px rgba(38, 110, 160, 0.06);
    }

    .service-item h3 {
      margin: 0 0 7px;
      font-size: 17px;
      color: #132b40;
    }

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

    .info-rail {
      padding: 22px;
      border-radius: 26px;
      background: linear-gradient(160deg, rgba(232,247,255,0.95), rgba(255,255,255,0.9));
      border: 1px solid rgba(186, 226, 247, 0.95);
      box-shadow: var(--shadow);
    }

    .info-rail h3 {
      margin: 0 0 12px;
      font-size: 20px;
      color: #12314a;
    }

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

    .info-list li {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      color: #405768;
      font-size: 14px;
    }

    .info-list li::before {
      content: "";
      width: 8px;
      height: 8px;
      margin-top: 8px;
      border-radius: 50%;
      flex: 0 0 auto;
      background: #45bfd0;
    }

    .process {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 14px;
      counter-reset: step;
    }

    .step {
      counter-increment: step;
      position: relative;
      padding: 20px;
      border-radius: 24px;
      background: rgba(255,255,255,0.84);
      border: 1px solid rgba(210, 235, 248, 0.95);
      box-shadow: 0 12px 32px rgba(38, 110, 160, 0.07);
    }

    .step::before {
      content: "0" counter(step);
      display: inline-flex;
      width: 44px;
      height: 32px;
      align-items: center;
      justify-content: center;
      border-radius: 999px;
      color: #166d9b;
      background: #e8f7ff;
      border: 1px solid #d0edf9;
      font-weight: 900;
      margin-bottom: 12px;
    }

    .step h3 {
      margin: 0 0 8px;
      font-size: 17px;
      color: #132b40;
    }

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

    .warranty-wrap {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 14px;
    }

    .warranty {
      padding: 18px;
      border-radius: 22px;
      background: #ffffff;
      border: 1px solid rgba(212, 235, 248, 0.95);
      box-shadow: 0 12px 30px rgba(38, 110, 160, 0.06);
    }

    .warranty h3 {
      margin: 0 0 8px;
      font-size: 17px;
      color: #132b40;
    }

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

    .contact-grid {
      display: grid;
      grid-template-columns: minmax(0, 0.82fr) minmax(280px, 0.46fr);
      gap: 18px;
      align-items: stretch;
    }

    .contact-card {
      padding: 24px;
      border-radius: 28px;
      background: linear-gradient(145deg, rgba(255,255,255,0.92), rgba(235,248,255,0.84));
      border: 1px solid rgba(198, 230, 248, 0.95);
      box-shadow: var(--shadow);
    }

    .contact-card h2 {
      margin: 0 0 14px;
      font-size: clamp(24px, 4vw, 34px);
      color: #12283a;
      letter-spacing: -0.03em;
    }

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

    .contact-lines li {
      padding: 14px 16px;
      border-radius: 18px;
      background: rgba(255,255,255,0.72);
      border: 1px solid rgba(214, 236, 248, 0.95);
      color: #33485a;
    }

    .contact-lines strong {
      color: #132b40;
      margin-right: 6px;
    }

    .qr-card {
      padding: 20px;
      border-radius: 28px;
      background: #ffffff;
      border: 1px solid rgba(212, 235, 248, 0.95);
      box-shadow: 0 12px 34px rgba(38, 110, 160, 0.08);
      text-align: center;
    }

    .qr-card h3 {
      margin: 0 0 10px;
      font-size: 19px;
      color: #132b40;
    }

    .qr-image {
      width: min(220px, 100%);
      margin: 0 auto 14px;
      padding: 10px;
      border-radius: 22px;
      background: #f4fbff;
      border: 1px solid #d8edf8;
    }

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

    .map-link {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 14px;
      border-radius: 999px;
      background: #e9f7ff;
      border: 1px solid #c9e8f8;
      color: #126795;
      font-weight: 800;
      font-size: 14px;
    }

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

    .faq-item {
      border-radius: 20px;
      background: rgba(255,255,255,0.88);
      border: 1px solid rgba(211, 234, 247, 0.95);
      overflow: hidden;
      box-shadow: 0 10px 28px rgba(38, 110, 160, 0.06);
    }

    .faq-question {
      width: 100%;
      border: 0;
      background: transparent;
      padding: 18px 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 14px;
      color: #132b40;
      font-size: 16px;
      font-weight: 800;
      text-align: left;
      cursor: pointer;
    }

    .faq-question span:last-child {
      width: 28px;
      height: 28px;
      border-radius: 50%;
      display: grid;
      place-items: center;
      background: #e8f7ff;
      color: #197aa9;
      flex: 0 0 auto;
      transition: transform 0.2s ease;
    }

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

    .faq-answer p {
      margin: 0;
      padding: 0 20px 18px;
      color: var(--muted);
      font-size: 14px;
    }

    .faq-item.active .faq-answer {
      max-height: 180px;
    }

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

    .links-panel {
      padding: 22px;
      border-radius: 28px;
      background: rgba(255,255,255,0.78);
      border: 1px solid rgba(207, 232, 246, 0.95);
      box-shadow: 0 12px 34px rgba(38, 110, 160, 0.08);
    }

    .links-panel h2 {
      margin: 0 0 14px;
      font-size: clamp(24px, 4vw, 32px);
      color: #12283a;
    }

    .link-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .link-cloud a {
      padding: 9px 12px;
      border-radius: 999px;
      background: #f2f9fe;
      border: 1px solid #d8edf8;
      color: #275d7d;
      font-size: 14px;
      transition: transform 0.2s ease, background 0.2s ease;
    }

    .link-cloud a:hover {
      transform: translateY(-1px);
      background: #e4f5ff;
    }

    .summary-card {
      padding: 24px;
      border-radius: 28px;
      background: linear-gradient(135deg, #ffffff, #eaf8ff);
      border: 1px solid rgba(196, 230, 249, 0.95);
      box-shadow: var(--shadow);
      display: grid;
      grid-template-columns: minmax(0, 1fr) auto;
      gap: 18px;
      align-items: center;
    }

    .summary-card h2 {
      margin: 0 0 8px;
      font-size: clamp(24px, 4vw, 34px);
      color: #12283a;
    }

    .summary-card p {
      margin: 0;
      color: var(--muted);
    }

    .site-footer {
      margin-top: 16px;
      padding: 28px 0;
      background: #eaf5fb;
      border-top: 1px solid #cfe7f4;
      color: #263d4d;
    }

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

    .footer-inner strong {
      color: #102438;
    }

    .footer-inner p {
      margin: 0;
      color: #4b5f70;
      font-size: 14px;
    }

    .footer-links {
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
    }

    .footer-links a {
      color: #235d83;
      font-size: 14px;
    }

    .back-top {
      position: fixed;
      right: 18px;
      bottom: 18px;
      width: 42px;
      height: 42px;
      border-radius: 50%;
      border: 1px solid #c6e4f5;
      background: rgba(255,255,255,0.92);
      color: #176f9f;
      box-shadow: 0 12px 28px rgba(38, 110, 160, 0.14);
      display: grid;
      place-items: center;
      cursor: pointer;
      opacity: 0;
      pointer-events: none;
      transform: translateY(8px);
      transition: opacity 0.2s ease, transform 0.2s ease;
      z-index: 40;
    }

    .back-top.show {
      opacity: 1;
      pointer-events: auto;
      transform: translateY(0);
    }

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

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

    @keyframes floatGlow {
      from {
        transform: translate3d(0, 0, 0) scale(1);
      }
      to {
        transform: translate3d(-24px, 28px, 0) scale(1.12);
      }
    }

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

      .hero-grid,
      .section-head,
      .service-layout,
      .contact-grid,
      .summary-card {
        grid-template-columns: 1fr;
      }

      .reason-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .process,
      .warranty-wrap {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }
    }

    @media (max-width: 760px) {
      :root {
        --pad-x: 16px;
      }

      .nav-wrap {
        min-height: 66px;
      }

      .brand-text span {
        display: none;
      }

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

      .nav-links {
        position: absolute;
        left: var(--pad-x);
        right: var(--pad-x);
        top: 72px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        padding: 12px;
        background: rgba(255,255,255,0.96);
        border: 1px solid #d6edf9;
        border-radius: 22px;
        box-shadow: var(--shadow);
      }

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

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

      .hero {
        padding-top: 38px;
      }

      .section {
        padding: 42px 0;
      }

      .phone-showcase,
      .service-grid,
      .reason-grid,
      .process,
      .warranty-wrap,
      .diagnosis-strip {
        grid-template-columns: 1fr;
      }

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

      .btn {
        width: 100%;
      }

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