:root {
      --red: #e31937;
      --red-dark: #c91430;
      --dark: #252525;
      --text: #484848;
      --muted: #747474;
      --border: #e5e5e5;
      --soft: #f6f7f8;
      --white: #ffffff;
      --green: #27853b;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      font-family: Arial, sans-serif;
      color: var(--text);
      background: var(--white);
      line-height: 1.65;
    }

    img {
      display: block;
      max-width: 100%;
    }

    a {
      color: inherit;
    }

    button,
    a {
      -webkit-tap-highlight-color: transparent;
    }

    .container {
      width: min(100% - 40px, 1160px);
      margin: 0 auto;
    }

    .topbar {
      padding: 26px 0;
      border-bottom: 1px solid var(--border);
    }

    .topbar__inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }

    .logo {
      display: inline-flex;
      align-items: center;
      text-decoration: none;
    }

    .logo img {
      width: 112px;
      height: auto;
    }

    .language-switcher {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .language-switcher a {
      color: var(--muted);
      font-size: 14px;
      font-weight: 700;
      text-decoration: none;
      transition: color 0.2s;
    }

    .language-switcher a:hover {
      color: var(--red);
    }

    .product-hero {
      padding: 64px 0 56px;
    }

    .product-hero__grid {
      display: grid;
      grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
      gap: 70px;
      align-items: center;
    }

    .product-image {
      min-height: 520px;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 50px;
      overflow: hidden;
      background: var(--soft);
      border: 1px solid var(--border);
      border-radius: 30px;
    }

    .product-image img {
      width: min(100%, 360px);
      max-height: 430px;
      object-fit: contain;
      transition: opacity 0.18s ease;
    }

    .product-image img.is-changing {
      opacity: 0.25;
    }

    .eyebrow {
      display: inline-block;
      margin-bottom: 18px;
      color: var(--red);
      font-size: 14px;
      font-weight: 800;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }

    h1 {
      margin: 0 0 20px;
      color: var(--dark);
      font-size: clamp(38px, 6vw, 68px);
      line-height: 1.02;
      letter-spacing: -0.045em;
    }

    .hero-lead {
      max-width: 680px;
      margin: 0 0 20px;
      color: var(--text);
      font-size: 21px;
      line-height: 1.55;
    }

    .hero-note {
      margin: 0 0 28px;
      color: var(--muted);
      font-size: 16px;
    }

    .volume-selector {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin: 0 0 30px;
    }

    .volume-button {
      min-width: 74px;
      padding: 11px 17px;
      border: 1px solid var(--border);
      border-radius: 999px;
      color: var(--dark);
      background: var(--white);
      font-family: inherit;
      font-size: 15px;
      font-weight: 800;
      line-height: 1;
      cursor: pointer;
      appearance: none;
      -webkit-appearance: none;
      transition:
        color 0.2s,
        background-color 0.2s,
        border-color 0.2s,
        transform 0.2s,
        box-shadow 0.2s;
    }

    .volume-button:hover {
      background: var(--soft);
      border-color: #c7c7c7;
      transform: translateY(-1px);
    }

    .volume-button.active {
      color: var(--white);
      background: var(--red);
      border-color: var(--red);
      box-shadow: 0 8px 22px rgba(227, 25, 55, 0.2);
    }

    .volume-button:focus-visible {
      outline: 3px solid rgba(227, 25, 55, 0.23);
      outline-offset: 3px;
    }



    .application-info {
      margin: -8px 0 28px;
      padding: 15px 18px;
      background: var(--soft);
      border: 1px solid var(--border);
      border-radius: 14px;
    }

    .application-info__label {
      display: block;
      margin-bottom: 3px;
      color: var(--dark);
      font-size: 14px;
      font-weight: 800;
    }

    .application-info p {
      margin: 0;
      color: var(--muted);
      font-size: 15px;
      line-height: 1.5;
    }

    .selected-price {
      display: flex;
      align-items: baseline;
      gap: 10px;
      margin: -8px 0 24px;
    }

    .selected-price__label {
      color: var(--muted);
      font-size: 16px;
      font-weight: 700;
    }

    .selected-price__value {
      color: var(--dark);
      font-size: 32px;
      font-weight: 900;
      line-height: 1;
      letter-spacing: -0.03em;
    }

    .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 52px;
      padding: 14px 26px;
      border: 1px solid transparent;
      border-radius: 12px;
      color: var(--white);
      background: var(--red);
      font-size: 16px;
      font-weight: 800;
      text-decoration: none;
      transition:
        background-color 0.2s,
        transform 0.2s;
    }

    .button:hover {
      background: var(--red-dark);
      transform: translateY(-1px);
    }

    .section {
      padding: 62px 0;
      border-top: 1px solid var(--border);
    }

    .section__heading {
      max-width: 800px;
      margin-bottom: 32px;
    }

    h2 {
      margin: 0 0 14px;
      color: var(--dark);
      font-size: clamp(28px, 4vw, 42px);
      line-height: 1.15;
      letter-spacing: -0.03em;
    }

    .section__lead {
      margin: 0;
      color: var(--muted);
      font-size: 18px;
    }

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

    .feature {
      padding: 24px;
      background: var(--soft);
      border: 1px solid var(--border);
      border-radius: 18px;
    }

    .feature h3 {
      margin: 0 0 8px;
      color: var(--dark);
      font-size: 18px;
    }

    .feature p {
      margin: 0;
    }

    .spec-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      overflow: hidden;
      border: 1px solid var(--border);
      border-radius: 18px;
    }

    .spec {
      display: grid;
      grid-template-columns: 170px 1fr;
      gap: 18px;
      padding: 18px 22px;
      border-bottom: 1px solid var(--border);
    }

    .spec:nth-child(odd) {
      border-right: 1px solid var(--border);
    }

    .spec:nth-last-child(-n + 2) {
      border-bottom: 0;
    }

    .spec__label {
      color: var(--muted);
      font-weight: 700;
    }

    .spec__value {
      color: var(--dark);
      font-weight: 700;
    }

    .price-table-wrap {
      overflow-x: auto;
      border: 1px solid var(--border);
      border-radius: 18px;
    }

    .price-table {
      width: 100%;
      min-width: 600px;
      border-collapse: collapse;
    }

    .price-table th,
    .price-table td {
      padding: 18px 22px;
      text-align: left;
      border-bottom: 1px solid var(--border);
    }

    .price-table th {
      color: var(--dark);
      background: var(--soft);
      font-size: 14px;
      letter-spacing: 0.05em;
      text-transform: uppercase;
    }

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

    .price {
      color: var(--red);
      font-weight: 800;
    }

    .price-note {
      color: var(--green);
      font-weight: 700;
    }

    .buy-panel {
      margin-top: 42px;
      padding: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
      background: var(--dark);
      border-radius: 24px;
    }

    .buy-panel h2 {
      margin-bottom: 8px;
      color: var(--white);
      font-size: clamp(26px, 4vw, 38px);
    }

    .buy-panel p {
      margin: 0;
      color: rgba(255, 255, 255, 0.72);
    }

    .buy-panel .button {
      flex: 0 0 auto;
    }

    .delivery-content {
      max-width: 900px;
      padding: 28px 30px;
      background: var(--soft);
      border: 1px solid var(--border);
      border-radius: 18px;
    }

    .delivery-content p {
      margin: 0 0 14px;
    }

    .delivery-content p:last-child {
      margin-bottom: 0;
    }

    .delivery-content strong {
      color: var(--dark);
    }

    .footer {
      padding: 30px 0 46px;
      color: var(--muted);
      font-size: 14px;
    }

    @media (max-width: 900px) {
      .product-hero__grid {
        grid-template-columns: 1fr;
        gap: 38px;
      }

      .product-image {
        min-height: 420px;
      }

      .spec-grid {
        grid-template-columns: 1fr;
      }

      .spec:nth-child(odd) {
        border-right: 0;
      }

      .spec:nth-last-child(-n + 2) {
        border-bottom: 1px solid var(--border);
      }

      .spec:last-child {
        border-bottom: 0;
      }
    }

    @media (max-width: 680px) {
      .container {
        width: min(100% - 28px, 1160px);
      }

      .topbar {
        padding: 20px 0;
      }

      .logo img {
        width: 94px;
      }

      .product-hero {
        padding: 38px 0 42px;
      }

      .product-image {
        min-height: 330px;
        padding: 30px;
        border-radius: 22px;
      }

      .product-image img {
        max-height: 290px;
      }

      .hero-lead {
        font-size: 18px;
      }

      .volume-selector {
        gap: 8px;
        margin-bottom: 24px;
      }

      .volume-button {
        min-width: 68px;
        padding: 10px 14px;
        font-size: 14px;
      }


      .selected-price {
        margin-top: -4px;
        margin-bottom: 22px;
      }

      .selected-price__value {
        font-size: 28px;
      }

      .button {
        width: 100%;
      }

      .section {
        padding: 46px 0;
      }

      .features {
        grid-template-columns: 1fr;
      }

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

      .buy-panel {
        align-items: flex-start;
        flex-direction: column;
        padding: 26px;
      }

      .buy-panel .button {
        width: 100%;
      }

      .delivery-content {
        padding: 22px;
      }
    }