:root {
      --bg: #f6fbf8;
      --sand: #fff7e8;
      --foam: #e6f7f3;
      --sea: #1d8f93;
      --sea-dark: #0d5f67;
      --ink: #18323a;
      --muted: #5c7074;
      --line: rgba(29, 143, 147, 0.18);
      --card: rgba(255, 255, 255, 0.86);
      --shadow: 0 18px 50px rgba(20, 83, 90, 0.12);
      --radius: 24px;
      --container: 1120px;
    }

    * {
      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(--ink);
      background:
        radial-gradient(circle at 8% 8%, rgba(255, 226, 168, 0.42), transparent 28%),
        radial-gradient(circle at 88% 12%, rgba(135, 215, 211, 0.38), transparent 30%),
        linear-gradient(180deg, #f2fbf8 0%, #fffaf0 48%, #f7fbf8 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% - 32px));
      margin: 0 auto;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(246, 251, 248, 0.88);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--line);
    }

    .nav {
      min-height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      font-weight: 800;
      letter-spacing: 0.02em;
      white-space: nowrap;
    }

    .logo {
      width: 42px;
      height: 42px;
      border-radius: 14px;
      display: grid;
      place-items: center;
      color: #fff;
      background: linear-gradient(135deg, var(--sea), #51b8a8);
      box-shadow: 0 10px 24px rgba(29, 143, 147, 0.24);
      font-size: 22px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .nav-links a {
      padding: 9px 12px;
      border-radius: 999px;
      color: #31494e;
      font-size: 14px;
      transition: background 0.2s ease, color 0.2s ease;
    }

    .nav-links a:hover {
      background: rgba(29, 143, 147, 0.1);
      color: var(--sea-dark);
    }

    .nav-action {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 16px;
      border-radius: 999px;
      color: #fff;
      background: var(--sea-dark);
      font-weight: 700;
      box-shadow: 0 12px 28px rgba(13, 95, 103, 0.2);
      white-space: nowrap;
    }

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

    main {
      position: relative;
    }

    section {
      padding: 56px 0;
    }

    .hero {
      padding: 72px 0 50px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.08fr) minmax(300px, 0.92fr);
      gap: 34px;
      align-items: center;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      border: 1px solid var(--line);
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.68);
      color: var(--sea-dark);
      font-weight: 700;
      font-size: 13px;
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #f2b95c;
      box-shadow: 0 0 0 5px rgba(242, 185, 92, 0.18);
    }

    h1 {
      margin: 18px 0 16px;
      font-size: clamp(34px, 6vw, 58px);
      line-height: 1.08;
      letter-spacing: -0.04em;
      color: #12343b;
    }

    .lead {
      max-width: 680px;
      margin: 0;
      color: var(--muted);
      font-size: clamp(16px, 2.2vw, 19px);
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 28px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      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:hover {
      transform: translateY(-2px);
    }

    .btn-primary {
      color: #fff;
      background: linear-gradient(135deg, var(--sea-dark), var(--sea));
      box-shadow: 0 14px 30px rgba(13, 95, 103, 0.22);
    }

    .btn-secondary {
      color: var(--sea-dark);
      background: rgba(255, 255, 255, 0.78);
      border-color: var(--line);
    }

    .quick-points {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      margin-top: 28px;
    }

    .quick-points span {
      padding: 12px;
      border-radius: 16px;
      background: rgba(255, 255, 255, 0.72);
      border: 1px solid var(--line);
      color: #365158;
      font-size: 14px;
      text-align: center;
    }

    .phone-card {
      position: relative;
      padding: 18px;
      border: 1px solid rgba(255, 255, 255, 0.88);
      border-radius: 34px;
      background: linear-gradient(160deg, rgba(255, 255, 255, 0.88), rgba(230, 247, 243, 0.7));
      box-shadow: var(--shadow);
      overflow: hidden;
      animation: floatIn 0.8s ease both;
    }

    .phone-card::before {
      content: "";
      position: absolute;
      inset: auto -40px -60px auto;
      width: 180px;
      height: 180px;
      border-radius: 50%;
      background: rgba(242, 185, 92, 0.25);
    }

    .phone-image {
      position: relative;
      border-radius: 26px;
      overflow: hidden;
      background: #eef8f5;
      aspect-ratio: 4 / 3;
      display: grid;
      place-items: center;
    }

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

    .diagnosis-strip {
      position: relative;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
      margin-top: 14px;
    }

    .diagnosis-strip div {
      padding: 12px;
      border-radius: 18px;
      background: rgba(255, 255, 255, 0.78);
      border: 1px solid var(--line);
    }

    .diagnosis-strip strong {
      display: block;
      color: var(--sea-dark);
      font-size: 15px;
    }

    .diagnosis-strip small {
      color: var(--muted);
    }

    .section-head {
      max-width: 760px;
      margin-bottom: 28px;
    }

    .section-head h2 {
      margin: 0 0 10px;
      font-size: clamp(26px, 4vw, 40px);
      line-height: 1.18;
      letter-spacing: -0.03em;
      color: #16363d;
    }

    .section-head p {
      margin: 0;
      color: var(--muted);
      font-size: 16px;
    }

    .panel {
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: var(--card);
      box-shadow: 0 14px 38px rgba(31, 90, 94, 0.08);
    }

    .reason-layout {
      display: grid;
      grid-template-columns: 0.9fr 1.1fr;
      gap: 18px;
      align-items: stretch;
    }

    .summary-panel {
      padding: 26px;
      background: linear-gradient(155deg, #fffdf6, #e9f8f4);
    }

    .summary-panel h3,
    .card h3,
    .step h3,
    .contact-card h3 {
      margin: 0 0 8px;
      font-size: 20px;
      color: #17363d;
    }

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

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

    .reason-item {
      padding: 20px;
      border-radius: 22px;
      background: rgba(255, 255, 255, 0.82);
      border: 1px solid var(--line);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .reason-item:hover {
      transform: translateY(-4px);
      box-shadow: 0 14px 26px rgba(29, 143, 147, 0.12);
    }

    .reason-item b {
      display: block;
      margin-bottom: 6px;
      color: var(--sea-dark);
      font-size: 16px;
    }

    .reason-item span {
      color: var(--muted);
      font-size: 14px;
    }

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

    .card {
      padding: 22px;
      min-height: 178px;
      border: 1px solid var(--line);
      border-radius: 24px;
      background: rgba(255, 255, 255, 0.78);
      transition: transform 0.2s ease, border-color 0.2s ease;
    }

    .card:hover {
      transform: translateY(-4px);
      border-color: rgba(29, 143, 147, 0.36);
    }

    .icon {
      width: 42px;
      height: 42px;
      margin-bottom: 14px;
      border-radius: 15px;
      display: grid;
      place-items: center;
      background: #e2f4ef;
      color: var(--sea-dark);
      font-weight: 900;
    }

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

    .step {
      counter-increment: step;
      padding: 22px;
      border-radius: 24px;
      background: linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(246, 251, 248, 0.78));
      border: 1px solid var(--line);
    }

    .step::before {
      content: counter(step);
      width: 36px;
      height: 36px;
      margin-bottom: 14px;
      border-radius: 50%;
      display: grid;
      place-items: center;
      background: var(--sand);
      color: #8a5a12;
      font-weight: 900;
    }

    .warranty-table {
      overflow: hidden;
      border-radius: 24px;
      border: 1px solid var(--line);
      background: rgba(255, 255, 255, 0.84);
    }

    .warranty-row {
      display: grid;
      grid-template-columns: 170px 1fr;
      gap: 16px;
      padding: 16px 20px;
      border-bottom: 1px solid var(--line);
      align-items: start;
    }

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

    .warranty-row strong {
      color: var(--sea-dark);
    }

    .warranty-row span {
      color: var(--muted);
    }

    .contact-layout {
      display: grid;
      grid-template-columns: 1.05fr 0.95fr;
      gap: 18px;
      align-items: start;
    }

    .contact-card {
      padding: 24px;
    }

    .contact-list {
      display: grid;
      gap: 12px;
      margin-top: 18px;
    }

    .contact-list div {
      padding: 14px 16px;
      border-radius: 18px;
      background: rgba(230, 247, 243, 0.7);
      color: #28464c;
    }

    .qr-box {
      display: grid;
      grid-template-columns: 150px 1fr;
      gap: 16px;
      align-items: center;
      padding: 18px;
      border-radius: 24px;
      background: #fffdf7;
      border: 1px solid rgba(242, 185, 92, 0.28);
    }

    .qr-box img {
      width: 150px;
      aspect-ratio: 1 / 1;
      object-fit: contain;
      border-radius: 18px;
      background: #fff;
      border: 1px solid #f2e5c9;
    }

    .map-link {
      display: inline-flex;
      margin-top: 10px;
      color: #0066cc;
      font-weight: 700;
    }

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

    .faq-item {
      border: 1px solid var(--line);
      border-radius: 20px;
      background: rgba(255, 255, 255, 0.82);
      overflow: hidden;
    }

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

    .faq-button span {
      flex: 1;
    }

    .faq-button::after {
      content: "+";
      width: 28px;
      height: 28px;
      border-radius: 50%;
      display: grid;
      place-items: center;
      background: var(--foam);
      color: var(--sea-dark);
      flex: 0 0 auto;
    }

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

    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.25s ease;
    }

    .faq-content p {
      margin: 0;
      padding: 0 20px 18px;
      color: var(--muted);
    }

    .final-cta {
      padding: 30px;
      border-radius: 30px;
      background:
        linear-gradient(135deg, rgba(255, 247, 232, 0.92), rgba(230, 247, 243, 0.92)),
        radial-gradient(circle at right top, rgba(29, 143, 147, 0.18), transparent 34%);
      border: 1px solid var(--line);
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 18px;
      align-items: center;
    }

    .final-cta h2 {
      margin: 0 0 8px;
      font-size: clamp(24px, 4vw, 34px);
      line-height: 1.22;
    }

    .final-cta p {
      margin: 0;
      color: var(--muted);
    }

    .site-footer {
      padding: 34px 0 24px;
      background: #103a40;
      color: #eaf7f5;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1fr 1.4fr;
      gap: 24px;
      align-items: start;
    }

    .footer-brand {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 10px;
      font-weight: 900;
    }

    .footer-logo {
      width: 38px;
      height: 38px;
      border-radius: 13px;
      display: grid;
      place-items: center;
      background: #e8c77d;
      color: #103a40;
      font-size: 20px;
    }

    .footer-text {
      margin: 0;
      color: #b9d4d1;
      font-size: 14px;
    }

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 8px 14px;
      justify-content: flex-end;
    }

    .friend-links a {
      color: #eaf7f5;
      font-size: 13px;
      opacity: 0.9;
    }

    .friend-links a:hover {
      opacity: 1;
      text-decoration: underline;
    }

    .copyright {
      margin-top: 22px;
      padding-top: 18px;
      border-top: 1px solid rgba(234, 247, 245, 0.16);
      color: #b9d4d1;
      font-size: 13px;
      text-align: center;
    }

    .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(20px) scale(0.98);
      }
      to {
        opacity: 1;
        transform: translateY(0) scale(1);
      }
    }

    @media (max-width: 920px) {
      .nav-links,
      .nav-action {
        display: none;
      }

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

      .nav.open {
        align-items: flex-start;
      }

      .nav.open .nav-links {
        position: absolute;
        left: 16px;
        right: 16px;
        top: 72px;
        display: grid;
        gap: 6px;
        padding: 12px;
        border: 1px solid var(--line);
        border-radius: 20px;
        background: rgba(255, 255, 255, 0.96);
        box-shadow: var(--shadow);
      }

      .nav.open .nav-links a {
        padding: 12px 14px;
      }

      .hero-grid,
      .reason-layout,
      .contact-layout,
      .final-cta,
      .footer-grid {
        grid-template-columns: 1fr;
      }

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

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

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

      section {
        padding: 42px 0;
      }

      .hero {
        padding: 48px 0 38px;
      }

      .quick-points,
      .reason-list,
      .service-grid,
      .solution-grid,
      .guard-grid,
      .steps,
      .diagnosis-strip {
        grid-template-columns: 1fr;
      }

      .warranty-row {
        grid-template-columns: 1fr;
        gap: 6px;
      }

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

      .qr-box img {
        width: 132px;
      }

      .hero-actions .btn,
      .final-cta .btn {
        width: 100%;
      }
    }