:root {
      --bg: #f6f7f8;
      --bg-soft: #eef2f5;
      --paper: #ffffff;
      --paper-ice: rgba(255, 255, 255, 0.82);
      --text: #1d2630;
      --muted: #64717f;
      --line: #d9e0e6;
      --silver: #bac5cf;
      --blue: #406985;
      --blue-dark: #25475d;
      --mist: #e9eef2;
      --warm: #f7f3ed;
      --shadow: 0 18px 48px rgba(43, 64, 82, 0.12);
      --shadow-soft: 0 10px 28px rgba(43, 64, 82, 0.08);
      --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 12% 8%, rgba(210, 222, 231, 0.86), transparent 30%),
        radial-gradient(circle at 86% 18%, rgba(247, 243, 237, 0.92), transparent 28%),
        linear-gradient(180deg, #f8f9fa 0%, #eef2f5 42%, #f7f7f4 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% - 36px));
      margin: 0 auto;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(247, 249, 250, 0.82);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(188, 200, 210, 0.55);
    }

    .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-shrink: 0;
    }

    .logo-mark {
      width: 42px;
      height: 42px;
      border-radius: 14px;
      display: grid;
      place-items: center;
      color: #173447;
      font-size: 24px;
      font-weight: 800;
      background:
        linear-gradient(145deg, #ffffff, #dce5ec),
        radial-gradient(circle at 30% 20%, #ffffff, transparent);
      box-shadow: inset 0 1px 0 rgba(255,255,255,.9), 0 10px 24px rgba(63, 87, 107, .16);
      border: 1px solid rgba(180, 193, 205, .7);
    }

    .brand-text {
      display: flex;
      flex-direction: column;
      line-height: 1.2;
    }

    .brand-text strong {
      font-size: 17px;
      letter-spacing: .04em;
    }

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

    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 8px;
      flex-wrap: wrap;
    }

    .nav-links a {
      padding: 9px 12px;
      color: #334555;
      font-size: 14px;
      border-radius: 999px;
      transition: background .25s ease, color .25s ease, transform .25s ease;
    }

    .nav-links a:hover {
      background: rgba(64, 105, 133, .10);
      color: var(--blue-dark);
      transform: translateY(-1px);
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 16px;
      border-radius: 999px;
      background: #1f465e;
      color: #ffffff;
      font-size: 14px;
      box-shadow: 0 10px 22px rgba(31, 70, 94, .18);
      transition: transform .25s ease, box-shadow .25s ease;
    }

    .nav-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 16px 30px rgba(31, 70, 94, .24);
    }

    .menu-btn {
      display: none;
      width: 42px;
      height: 42px;
      border: 1px solid var(--line);
      background: rgba(255,255,255,.74);
      border-radius: 14px;
      color: var(--text);
      font-size: 20px;
      cursor: pointer;
    }

    main {
      position: relative;
    }

    .section {
      padding: 54px 0;
    }

    .hero {
      padding: 58px 0 52px;
    }

    .hero-wrap {
      display: grid;
      grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr);
      gap: 34px;
      align-items: center;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      border-radius: 999px;
      background: rgba(255,255,255,.74);
      border: 1px solid rgba(190, 202, 213, .72);
      color: #38586d;
      font-size: 13px;
      box-shadow: var(--shadow-soft);
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 99px;
      background: #6d91a9;
      box-shadow: 0 0 0 5px rgba(109,145,169,.16);
    }

    h1 {
      margin: 18px 0 18px;
      font-size: clamp(34px, 6vw, 58px);
      line-height: 1.08;
      letter-spacing: -0.04em;
      color: #172837;
    }

    .lead {
      margin: 0;
      max-width: 680px;
      font-size: 17px;
      color: #52616f;
    }

    .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: 14px;
      border: 1px solid transparent;
      font-weight: 700;
      transition: transform .25s ease, box-shadow .25s ease, background .25s ease;
      cursor: pointer;
    }

    .btn-primary {
      background: linear-gradient(135deg, #1f465e, #547990);
      color: #ffffff;
      box-shadow: 0 14px 30px rgba(31, 70, 94, .20);
    }

    .btn-secondary {
      background: rgba(255,255,255,.78);
      color: #243b4d;
      border-color: rgba(180, 194, 207, .86);
      box-shadow: var(--shadow-soft);
    }

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

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

    .hero-visual {
      position: relative;
      padding: 14px;
      border-radius: 30px;
      background: linear-gradient(145deg, rgba(255,255,255,.82), rgba(223,231,237,.72));
      border: 1px solid rgba(190,202,213,.8);
      box-shadow: var(--shadow);
      overflow: hidden;
    }

    .hero-visual::before {
      content: "";
      position: absolute;
      inset: -30% -20% auto auto;
      width: 220px;
      height: 220px;
      background: radial-gradient(circle, rgba(255,255,255,.94), transparent 66%);
      animation: slowFloat 8s ease-in-out infinite alternate;
    }

    .phone-frame {
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      background: #f8fafb;
      border: 1px solid rgba(197, 207, 216, .88);
      aspect-ratio: 4 / 3;
    }

    .phone-frame img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      padding: 18px;
    }

    .status-card {
      position: absolute;
      left: 28px;
      bottom: 28px;
      max-width: 260px;
      padding: 14px 16px;
      border-radius: 18px;
      background: rgba(255,255,255,.88);
      border: 1px solid rgba(203, 213, 222, .86);
      box-shadow: 0 14px 32px rgba(43, 64, 82, .14);
      backdrop-filter: blur(14px);
    }

    .status-card strong {
      display: block;
      color: #1f394b;
      margin-bottom: 4px;
    }

    .status-card span {
      display: block;
      color: #63717e;
      font-size: 13px;
      line-height: 1.55;
    }

    .section-title {
      display: grid;
      gap: 10px;
      margin-bottom: 26px;
    }

    .section-title.center {
      text-align: center;
      justify-items: center;
    }

    .section-title h2 {
      margin: 0;
      font-size: clamp(25px, 4vw, 38px);
      line-height: 1.18;
      letter-spacing: -0.03em;
      color: #182b3a;
    }

    .section-title p {
      margin: 0;
      max-width: 760px;
      color: #657381;
    }

    .diagnosis-panel {
      display: grid;
      grid-template-columns: .92fr 1.08fr;
      gap: 22px;
      align-items: stretch;
    }

    .glass-box {
      background: var(--paper-ice);
      border: 1px solid rgba(190, 202, 213, .78);
      border-radius: var(--radius);
      box-shadow: var(--shadow-soft);
      overflow: hidden;
    }

    .answer-card {
      padding: 28px;
      background:
        linear-gradient(145deg, rgba(255,255,255,.92), rgba(232,238,243,.76));
    }

    .answer-card h3 {
      margin: 0 0 12px;
      font-size: 22px;
      color: #1d3446;
    }

    .answer-card p {
      margin: 0 0 14px;
      color: #5a6875;
    }

    .signal-list {
      margin: 20px 0 0;
      padding: 0;
      list-style: none;
      display: grid;
      gap: 12px;
    }

    .signal-list li {
      display: grid;
      grid-template-columns: 28px 1fr;
      gap: 10px;
      align-items: start;
      color: #344858;
    }

    .signal-list b {
      width: 28px;
      height: 28px;
      border-radius: 10px;
      display: grid;
      place-items: center;
      background: #e4edf3;
      color: #2a5a76;
      font-size: 14px;
    }

    .repair-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 14px;
      padding: 18px;
    }

    .mini-card {
      padding: 18px;
      border-radius: 18px;
      background: rgba(255,255,255,.78);
      border: 1px solid rgba(204, 214, 222, .84);
      transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
    }

    .mini-card:hover {
      transform: translateY(-3px);
      box-shadow: 0 14px 28px rgba(43,64,82,.10);
      border-color: rgba(126, 153, 173, .8);
    }

    .mini-card h3 {
      margin: 0 0 8px;
      color: #21384a;
      font-size: 17px;
    }

    .mini-card p {
      margin: 0;
      color: #687582;
      font-size: 14px;
    }

    .service-strip {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 14px;
    }

    .service-item {
      padding: 20px;
      border-radius: 22px;
      background: rgba(255,255,255,.76);
      border: 1px solid rgba(190,202,213,.76);
      box-shadow: var(--shadow-soft);
      min-height: 142px;
    }

    .service-item .icon {
      width: 38px;
      height: 38px;
      border-radius: 14px;
      display: grid;
      place-items: center;
      background: linear-gradient(145deg, #eef4f8, #ffffff);
      color: #315e78;
      font-weight: 900;
      margin-bottom: 12px;
      border: 1px solid rgba(198, 210, 219, .78);
    }

    .service-item h3 {
      margin: 0 0 8px;
      font-size: 17px;
      color: #1f3546;
    }

    .service-item p {
      margin: 0;
      font-size: 14px;
      color: #687582;
    }

    .solution {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 22px;
      align-items: start;
    }

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

    .step-list li {
      counter-increment: step;
      display: grid;
      grid-template-columns: 44px 1fr;
      gap: 14px;
      padding: 18px;
      border-radius: 20px;
      background: rgba(255,255,255,.78);
      border: 1px solid rgba(194, 206, 216, .8);
    }

    .step-list li::before {
      content: counter(step);
      width: 44px;
      height: 44px;
      border-radius: 16px;
      display: grid;
      place-items: center;
      background: #24495f;
      color: #ffffff;
      font-weight: 800;
      box-shadow: 0 10px 20px rgba(36,73,95,.18);
    }

    .step-list strong {
      display: block;
      margin-bottom: 4px;
      color: #23394a;
    }

    .step-list span {
      color: #687582;
      font-size: 14px;
    }

    .gallery {
      display: grid;
      gap: 14px;
    }

    .gallery-main {
      border-radius: 24px;
      overflow: hidden;
      background: rgba(255,255,255,.78);
      border: 1px solid rgba(190,202,213,.78);
      aspect-ratio: 16 / 10;
      display: grid;
      place-items: center;
    }

    .gallery-main img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      padding: 16px;
    }

    .gallery-thumbs {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
    }

    .gallery-thumbs button {
      padding: 0;
      border: 1px solid rgba(190,202,213,.8);
      border-radius: 18px;
      background: rgba(255,255,255,.72);
      cursor: pointer;
      overflow: hidden;
      aspect-ratio: 4 / 3;
      transition: transform .25s ease, border-color .25s ease;
    }

    .gallery-thumbs button:hover,
    .gallery-thumbs button.active {
      transform: translateY(-2px);
      border-color: #557d95;
    }

    .gallery-thumbs img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      padding: 8px;
    }

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

    .warranty-card {
      padding: 20px;
      border-radius: 20px;
      background: linear-gradient(145deg, rgba(255,255,255,.84), rgba(238,243,246,.76));
      border: 1px solid rgba(190,202,213,.78);
      box-shadow: var(--shadow-soft);
    }

    .warranty-card h3 {
      margin: 0 0 8px;
      font-size: 17px;
      color: #203749;
    }

    .warranty-card p {
      margin: 0;
      color: #667481;
      font-size: 14px;
    }

    .contact-panel {
      display: grid;
      grid-template-columns: 1fr .92fr;
      gap: 22px;
      align-items: stretch;
    }

    .contact-info {
      padding: 28px;
      background:
        linear-gradient(135deg, rgba(255,255,255,.9), rgba(230,237,242,.72));
    }

    .info-list {
      display: grid;
      gap: 14px;
      margin-top: 20px;
    }

    .info-row {
      display: grid;
      grid-template-columns: 84px 1fr;
      gap: 12px;
      padding-bottom: 14px;
      border-bottom: 1px solid rgba(190,202,213,.68);
    }

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

    .info-row span {
      color: #71808e;
      font-size: 14px;
    }

    .info-row strong,
    .info-row a {
      color: #203749;
      font-weight: 700;
    }

    .qr-box {
      padding: 22px;
      display: grid;
      align-content: start;
      gap: 16px;
      background: rgba(255,255,255,.72);
    }

    .qr-card {
      padding: 16px;
      border-radius: 20px;
      background: #ffffff;
      border: 1px solid rgba(190,202,213,.78);
      box-shadow: var(--shadow-soft);
    }

    .qr-card img {
      width: min(220px, 100%);
      margin: 0 auto;
      border-radius: 12px;
    }

    .map-link {
      display: inline-flex;
      justify-content: center;
      align-items: center;
      min-height: 44px;
      padding: 10px 14px;
      border-radius: 14px;
      background: #edf4f8;
      color: #245570;
      font-weight: 700;
      border: 1px solid rgba(181, 199, 211, .9);
    }

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

    .faq-item {
      border: 1px solid rgba(190,202,213,.78);
      border-radius: 18px;
      background: rgba(255,255,255,.78);
      overflow: hidden;
      box-shadow: 0 8px 18px rgba(43, 64, 82, .06);
    }

    .faq-question {
      width: 100%;
      padding: 18px 20px;
      border: 0;
      background: transparent;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      color: #203749;
      font-size: 16px;
      font-weight: 800;
      text-align: left;
      cursor: pointer;
    }

    .faq-question span {
      flex: 1;
    }

    .faq-question b {
      width: 28px;
      height: 28px;
      border-radius: 10px;
      display: grid;
      place-items: center;
      background: #edf4f8;
      color: #2b5c77;
      transition: transform .25s ease;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height .28s ease;
    }

    .faq-answer p {
      margin: 0;
      padding: 0 20px 18px;
      color: #667481;
    }

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

    .faq-item.open .faq-question b {
      transform: rotate(45deg);
    }

    .links-box {
      padding: 22px;
      border-radius: 22px;
      background: rgba(255,255,255,.7);
      border: 1px solid rgba(190,202,213,.78);
      box-shadow: var(--shadow-soft);
    }

    .links-box h2 {
      margin: 0 0 14px;
      font-size: 22px;
      color: #203749;
    }

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .friend-links a {
      padding: 8px 12px;
      border-radius: 999px;
      color: #35566a;
      background: #eef4f8;
      border: 1px solid rgba(185, 201, 213, .82);
      font-size: 13px;
      transition: transform .25s ease, background .25s ease;
    }

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

    .site-footer {
      margin-top: 10px;
      background: #e9eef2;
      border-top: 1px solid rgba(190,202,213,.8);
      color: #2b3d4b;
    }

    .footer-inner {
      padding: 26px 0;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      flex-wrap: wrap;
    }

    .footer-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      color: #203749;
      font-weight: 800;
    }

    .footer-meta {
      color: #5f6f7c;
      font-size: 14px;
    }

    .reveal {
      opacity: 0;
      transform: translateY(18px);
      transition: opacity .65s ease, transform .65s ease;
    }

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

    @keyframes slowFloat {
      from {
        transform: translate3d(0, 0, 0) scale(1);
      }
      to {
        transform: translate3d(-28px, 22px, 0) scale(1.08);
      }
    }

    @media (max-width: 980px) {
      .menu-btn {
        display: grid;
        place-items: center;
      }

      .nav {
        position: relative;
      }

      .nav-links {
        position: absolute;
        left: 0;
        right: 0;
        top: 72px;
        display: none;
        padding: 14px;
        border-radius: 0 0 22px 22px;
        background: rgba(247,249,250,.96);
        border: 1px solid rgba(190,202,213,.8);
        box-shadow: var(--shadow-soft);
      }

      .nav-links.open {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 8px;
      }

      .nav-links a,
      .nav-cta {
        width: 100%;
      }

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

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

    @media (max-width: 640px) {
      .container {
        width: min(var(--container), calc(100% - 28px));
      }

      .section {
        padding: 42px 0;
      }

      .hero {
        padding-top: 36px;
      }

      .brand-text span {
        display: none;
      }

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

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

      .btn {
        width: 100%;
      }

      .status-card {
        position: static;
        max-width: none;
        margin-top: 12px;
      }

      .repair-grid,
      .service-strip,
      .warranty-grid,
      .gallery-thumbs {
        grid-template-columns: 1fr;
      }

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

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