:root {
      --violet-deep: #24103f;
      --violet-dark: #3e1d68;
      --violet: #7040a6;
      --violet-light: #a579d1;
      --lilac: #eee4fb;
      --lavender: #f8f4fd;
      --magenta: #c35be0;
      --ink: #30243d;
      --muted: #71647d;
      --line: #e4d8ef;
      --white: #ffffff;
      --shadow: 0 18px 48px rgba(62, 29, 104, 0.12);
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      background: var(--lavender);
      color: var(--ink);
      font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: var(--violet);
      text-decoration-thickness: 1px;
      text-underline-offset: 3px;
    }

    a:hover {
      color: var(--violet-deep);
    }

    .page-shell {
      overflow: hidden;
    }

    .hero {
      position: relative;
      color: var(--white);
      background:
        radial-gradient(circle at 87% 10%, rgba(238, 210, 255, 0.31), transparent 24%),
        radial-gradient(circle at 15% 90%, rgba(203, 104, 232, 0.28), transparent 30%),
        linear-gradient(135deg, #251043 0%, #4c2377 55%, #8c4fb5 100%);
    }

    .hero::after {
      content: "";
      position: absolute;
      inset: auto -8% -84px -8%;
      height: 150px;
      border-radius: 50% 50% 0 0 / 48% 48% 0 0;
      background: var(--lavender);
    }

    .hero-inner {
      position: relative;
      z-index: 1;
      max-width: 1180px;
      margin: 0 auto;
      padding: 78px 24px 122px;
    }

    .eyebrow {
      display: inline-flex;
      margin-bottom: 20px;
      padding: 7px 13px;
      border: 1px solid rgba(255, 255, 255, 0.36);
      border-radius: 999px;
      color: #f8edff;
      font-size: 0.76rem;
      font-weight: 700;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }

    h1,
    h2,
    h3 {
      color: var(--violet-deep);
      line-height: 1.25;
      margin-top: 0;
    }

    h1 {
      max-width: 970px;
      margin-bottom: 22px;
      color: var(--white);
      font-size: clamp(2.1rem, 5vw, 4.35rem);
      letter-spacing: -0.035em;
    }

    .hero-lead {
      max-width: 790px;
      margin: 0;
      color: #f4eaff;
      font-size: clamp(1.05rem, 2vw, 1.28rem);
    }

    .hero-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 28px;
    }

    .hero-meta span {
      padding: 8px 13px;
      border-radius: 8px;
      background: rgba(255, 255, 255, 0.14);
      color: #fffaff;
      font-size: 0.88rem;
    }

    .breadcrumbs {
      position: relative;
      z-index: 2;
      max-width: 1180px;
      margin: -58px auto 0;
      padding: 0 24px 34px;
      color: var(--muted);
      font-size: 0.9rem;
    }

    .breadcrumbs a {
      color: var(--muted);
      text-decoration: none;
    }

    .breadcrumbs span {
      margin: 0 8px;
      color: #aa99b8;
    }

    main {
      max-width: 1180px;
      margin: 0 auto;
      padding: 0 24px 72px;
    }

    .answer-box {
      margin-bottom: 34px;
      padding: 28px 30px;
      border: 1px solid #dcc5f1;
      border-left: 5px solid var(--magenta);
      border-radius: 16px;
      background: linear-gradient(135deg, #ffffff 0%, #f5edfc 100%);
      box-shadow: var(--shadow);
    }

    .answer-box h2 {
      margin-bottom: 10px;
      font-size: 1.35rem;
    }

    .answer-box p {
      margin: 0;
    }

    .content-grid {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 310px;
      gap: 34px;
      align-items: start;
    }

    .article-body {
      min-width: 0;
      padding: 38px 42px;
      border: 1px solid var(--line);
      border-radius: 18px;
      background: var(--white);
      box-shadow: var(--shadow);
    }

    .article-body h2 {
      margin: 42px 0 16px;
      padding-top: 10px;
      border-top: 1px solid var(--line);
      font-size: clamp(1.55rem, 3vw, 2.1rem);
    }

    .article-body h2:first-child {
      margin-top: 0;
      padding-top: 0;
      border-top: 0;
    }

    .article-body h3 {
      margin: 25px 0 10px;
      font-size: 1.18rem;
    }

    .article-body p {
      margin: 0 0 17px;
    }

    .article-body ul,
    .article-body ol {
      margin: 12px 0 22px;
      padding-left: 24px;
    }

    .article-body li {
      margin: 8px 0;
    }

    .benefit-grid,
    .electrode-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 14px;
      margin: 22px 0 25px;
    }

    .benefit-card,
    .electrode-card {
      padding: 20px;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: var(--lavender);
    }

    .benefit-card strong,
    .electrode-card strong {
      display: block;
      margin-bottom: 7px;
      color: var(--violet-dark);
    }

    .benefit-card p,
    .electrode-card p {
      margin: 0;
      color: var(--muted);
      font-size: 0.92rem;
      line-height: 1.6;
    }

    .info-table {
      width: 100%;
      margin: 20px 0 25px;
      border: 1px solid var(--line);
      border-collapse: collapse;
      border-radius: 12px;
      overflow: hidden;
      font-size: 0.94rem;
    }

    .info-table th,
    .info-table td {
      padding: 14px 15px;
      border-bottom: 1px solid var(--line);
      text-align: left;
      vertical-align: top;
    }

    .info-table th {
      background: var(--lilac);
      color: var(--violet-deep);
      font-weight: 700;
    }

    .info-table tr:last-child td {
      border-bottom: 0;
    }

    .check-list {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 12px;
      margin: 20px 0 24px;
      padding: 0;
      list-style: none;
    }

    .check-list li {
      position: relative;
      margin: 0;
      padding: 15px 16px 15px 43px;
      border: 1px solid var(--line);
      border-radius: 12px;
      background: var(--lavender);
    }

    .check-list li::before {
      content: "✓";
      position: absolute;
      left: 16px;
      top: 13px;
      color: var(--magenta);
      font-size: 1.2rem;
      font-weight: 800;
    }

    .callout {
      margin: 25px 0;
      padding: 22px 24px;
      border-radius: 14px;
      background: #f5edfc;
      box-shadow: inset 4px 0 0 var(--violet);
    }

    .callout strong {
      color: var(--violet-deep);
    }

    .price-card {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      margin: 22px 0 25px;
      padding: 23px 25px;
      border: 1px solid #d9bceb;
      border-radius: 15px;
      background: linear-gradient(135deg, #f8f0ff, #eee2fb);
    }

    .price-card strong {
      display: block;
      color: var(--violet-dark);
      font-size: 0.9rem;
    }

    .price {
      color: var(--violet-deep);
      font-size: 1.9rem;
      font-weight: 800;
      white-space: nowrap;
    }

    .faq-list {
      display: grid;
      gap: 12px;
      margin-top: 20px;
    }

    .faq-list details {
      border: 1px solid var(--line);
      border-radius: 12px;
      background: var(--lavender);
    }

    .faq-list summary {
      cursor: pointer;
      padding: 16px 18px;
      color: var(--violet-deep);
      font-weight: 700;
    }

    .faq-list details p {
      margin: 0;
      padding: 0 18px 17px;
    }

    .cta {
      margin-top: 40px;
      padding: 30px;
      border-radius: 16px;
      background: linear-gradient(135deg, var(--violet-deep), var(--violet));
      color: var(--white);
    }

    .cta h2 {
      margin-bottom: 10px;
      color: var(--white);
      font-size: 1.6rem;
    }

    .cta p {
      color: #f2e8fb;
    }

    .cta-button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-top: 7px;
      padding: 12px 18px;
      border-radius: 9px;
      background: var(--white);
      color: var(--violet-deep);
      font-weight: 800;
      text-decoration: none;
    }

    .cta-button:hover {
      background: #f3eaff;
      color: var(--violet-deep);
    }

    .sidebar {
      position: sticky;
      top: 22px;
      display: grid;
      gap: 18px;
    }

    .side-card {
      padding: 23px;
      border: 1px solid var(--line);
      border-radius: 16px;
      background: var(--white);
      box-shadow: 0 10px 30px rgba(62, 29, 104, 0.07);
    }

    .side-card h2 {
      margin-bottom: 13px;
      font-size: 1.12rem;
    }

    .toc {
      margin: 0;
      padding-left: 19px;
    }

    .toc li {
      margin: 8px 0;
      line-height: 1.45;
    }

    .toc a {
      font-size: 0.92rem;
      text-decoration: none;
    }

    .keyword-list {
      display: flex;
      flex-wrap: wrap;
      gap: 7px;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .keyword-list li {
      padding: 6px 9px;
      border-radius: 7px;
      background: var(--lilac);
      color: var(--violet);
      font-size: 0.78rem;
    }

    .note {
      color: var(--muted);
      font-size: 0.9rem;
    }

    footer {
      padding: 28px 24px 40px;
      border-top: 1px solid var(--line);
      color: var(--muted);
      text-align: center;
      font-size: 0.88rem;
    }

    @media (max-width: 900px) {
      .content-grid {
        grid-template-columns: 1fr;
      }

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

    @media (max-width: 680px) {
      .hero-inner {
        padding: 52px 18px 110px;
      }

      .breadcrumbs,
      main {
        padding-left: 18px;
        padding-right: 18px;
      }

      .article-body {
        padding: 27px 21px;
      }

      .answer-box {
        padding: 22px 20px;
      }

      .benefit-grid,
      .electrode-grid,
      .check-list,
      .sidebar {
        grid-template-columns: 1fr;
      }

      .price-card {
        align-items: flex-start;
        flex-direction: column;
      }

      .info-table {
        display: block;
        overflow-x: auto;
      }
    }