.rc-product-detail,
    .rc-product-detail * { box-sizing: border-box; }
    .rc-product-detail {
      --rc-red: #e60012;
      --rc-red-dark: #b5000d;
      --rc-black: #171717;
      --rc-text: #2b2b2b;
      --rc-muted: #666b72;
      --rc-light: #f6f7f8;
      --rc-line: #e5e7eb;
      max-width: 1180px;
      margin: 0 auto;
      color: var(--rc-text);
      font-family: Arial, Helvetica, sans-serif;
      font-size: 16px;
      line-height: 1.65;
      background: #fff;
    }
    .rc-product-detail h2,
    .rc-product-detail h3,
    .rc-product-detail p { margin-top: 0; }
    .rc-product-detail img { display: block; max-width: 100%; }
    .rc-product-detail a { text-decoration: none; }
    .rc-hero {
      display: grid;
      grid-template-columns: 1.06fr .94fr;
      min-height: 520px;
      overflow: hidden;
      border-radius: 22px;
      background: linear-gradient(135deg, #111 0%, #222 100%);
      box-shadow: 0 18px 50px rgba(0,0,0,.14);
    }
    .rc-hero-copy {
      padding: 66px 56px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .rc-kicker {
      display: inline-flex;
      align-items: center;
      width: fit-content;
      padding: 7px 12px;
      margin-bottom: 20px;
      border: 1px solid rgba(255,255,255,.22);
      border-radius: 999px;
      color: #fff;
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 1.4px;
      text-transform: uppercase;
    }
    .rc-kicker:before {
      content: "";
      width: 7px;
      height: 7px;
      margin-right: 8px;
      border-radius: 50%;
      background: var(--rc-red);
      box-shadow: 0 0 0 4px rgba(230,0,18,.17);
    }
    .rc-hero h2 {
      margin-bottom: 20px;
      color: #fff;
      font-size: 46px;
      line-height: 1.12;
      letter-spacing: -.8px;
    }
    .rc-hero-copy > p {
      max-width: 620px;
      margin-bottom: 28px;
      color: rgba(255,255,255,.76);
      font-size: 17px;
    }
    .rc-pills {
      display: flex;
      flex-wrap: wrap;
      gap: 9px;
      margin-bottom: 32px;
    }
    .rc-pills span {
      padding: 8px 12px;
      border-radius: 7px;
      background: rgba(255,255,255,.08);
      color: #fff;
      font-size: 13px;
      font-weight: 700;
    }
    .rc-actions { display: flex; flex-wrap: wrap; gap: 12px; }
    .rc-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 48px;
      padding: 12px 22px;
      border-radius: 7px;
      font-weight: 700;
      transition: transform .2s ease, background .2s ease;
    }
    .rc-btn:hover { transform: translateY(-2px); }
    .rc-btn-primary { background: var(--rc-red); color: #fff !important; }
    .rc-btn-primary:hover { background: var(--rc-red-dark); }
    .rc-btn-secondary { border: 1px solid rgba(255,255,255,.45); color: #fff !important; }
    .rc-hero-media {
      position: relative;
      min-height: 520px;
      background: #fff;
    }
    .rc-hero-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .rc-media-tag {
      position: absolute;
      right: 20px;
      bottom: 20px;
      padding: 10px 14px;
      border-radius: 7px;
      background: rgba(23,23,23,.9);
      color: #fff;
      font-size: 13px;
      font-weight: 700;
    }
    .rc-stat-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 14px;
      margin: 22px 0 72px;
    }
    .rc-stat {
      padding: 24px 20px;
      border: 1px solid var(--rc-line);
      border-radius: 14px;
      background: #fff;
      text-align: center;
    }
    .rc-stat strong {
      display: block;
      margin-bottom: 4px;
      color: var(--rc-red);
      font-size: 29px;
      line-height: 1.15;
    }
    .rc-stat span { color: var(--rc-muted); font-size: 13px; font-weight: 700; }
    .rc-section { margin: 0 0 78px; }
    .rc-section-head { max-width: 780px; margin-bottom: 32px; }
    .rc-section-label {
      display: block;
      margin-bottom: 10px;
      color: var(--rc-red);
      font-size: 12px;
      font-weight: 800;
      letter-spacing: 1.5px;
      text-transform: uppercase;
    }
    .rc-section h2 {
      margin-bottom: 10px;
      color: var(--rc-black);
      font-size: 34px;
      line-height: 1.2;
    }
    .rc-section-head p { color: var(--rc-muted); }
    .rc-overview {
      display: grid;
      grid-template-columns: .9fr 1.1fr;
      gap: 42px;
      align-items: center;
    }
    .rc-overview-image {
      overflow: hidden;
      border: 1px solid var(--rc-line);
      border-radius: 18px;
      background: var(--rc-light);
    }
    .rc-overview-image img { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; }
    .rc-check-list { display: grid; gap: 13px; }
    .rc-check-item {
      position: relative;
      padding: 15px 16px 15px 48px;
      border: 1px solid var(--rc-line);
      border-radius: 10px;
      background: #fff;
    }
    .rc-check-item:before {
      content: "✓";
      position: absolute;
      left: 15px;
      top: 15px;
      width: 23px;
      height: 23px;
      border-radius: 50%;
      background: var(--rc-red);
      color: #fff;
      font-size: 14px;
      font-weight: 800;
      line-height: 23px;
      text-align: center;
    }
    .rc-check-item strong { display: block; margin-bottom: 2px; color: var(--rc-black); }
    .rc-check-item span { color: var(--rc-muted); font-size: 14px; }
    .rc-table-wrap {
      overflow-x: auto;
      border: 1px solid var(--rc-line);
      border-radius: 14px;
      background: #fff;
    }
    .rc-table {
      width: 100%;
      min-width: 680px;
      border-collapse: collapse;
    }
    .rc-table th,
    .rc-table td {
      padding: 14px 17px;
      border-bottom: 1px solid var(--rc-line);
      text-align: left;
      vertical-align: top;
    }
    .rc-table th {
      width: 34%;
      background: #fafafa;
      color: var(--rc-black);
      font-size: 14px;
    }
    .rc-table td { color: #4d5156; font-size: 14px; }
    .rc-table tr:last-child th,
    .rc-table tr:last-child td { border-bottom: 0; }
    .rc-performance {
      padding: 46px;
      border-radius: 20px;
      background: var(--rc-black);
      color: #fff;
    }
    .rc-performance .rc-section-label { color: #ff4b58; }
    .rc-performance h2 { color: #fff; }
    .rc-performance > p { color: rgba(255,255,255,.7); }
    .rc-radius-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 14px;
      margin-top: 30px;
    }
    .rc-radius-card {
      padding: 24px;
      border: 1px solid rgba(255,255,255,.12);
      border-radius: 13px;
      background: rgba(255,255,255,.055);
    }
    .rc-radius-card small {
      display: block;
      margin-bottom: 9px;
      color: rgba(255,255,255,.56);
      font-size: 12px;
      font-weight: 700;
      letter-spacing: .7px;
      text-transform: uppercase;
    }
    .rc-radius-card strong {
      display: block;
      margin-bottom: 5px;
      color: #fff;
      font-size: 30px;
    }
    .rc-radius-card span { color: rgba(255,255,255,.72); font-size: 13px; }
    .rc-construction-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 15px;
    }
    .rc-construction-card {
      min-height: 220px;
      padding: 25px 21px;
      border: 1px solid var(--rc-line);
      border-radius: 14px;
      background: #fff;
    }
    .rc-step {
      display: inline-flex;
      width: 42px;
      height: 42px;
      margin-bottom: 25px;
      align-items: center;
      justify-content: center;
      border-radius: 10px;
      background: var(--rc-red);
      color: #fff;
      font-weight: 800;
    }
    .rc-construction-card h3 { margin-bottom: 8px; color: var(--rc-black); font-size: 18px; }
    .rc-construction-card p { color: var(--rc-muted); font-size: 14px; }
    .rc-size-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
    }
    .rc-size-card {
      overflow: hidden;
      border: 1px solid var(--rc-line);
      border-radius: 14px;
      background: #fff;
    }
    .rc-size-title {
      padding: 18px 20px;
      background: var(--rc-black);
      color: #fff;
      font-weight: 800;
    }
    .rc-size-title span { color: #ff5662; }
    .rc-size-table { width: 100%; border-collapse: collapse; }
    .rc-size-table th,
    .rc-size-table td {
      padding: 10px 16px;
      border-bottom: 1px solid var(--rc-line);
      font-size: 13px;
      text-align: left;
    }
    .rc-size-table th { background: #fafafa; color: var(--rc-black); }
    .rc-size-table tr:last-child td { border-bottom: 0; }
    .rc-note {
      margin-top: 14px;
      padding: 14px 16px;
      border-left: 4px solid var(--rc-red);
      background: #fff5f6;
      color: #6d3d41;
      font-size: 13px;
    }
    .rc-app-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 15px;
    }
    .rc-app-card {
      padding: 24px;
      border: 1px solid var(--rc-line);
      border-radius: 14px;
      background: var(--rc-light);
    }
    .rc-app-icon {
      display: inline-flex;
      min-width: 42px;
      height: 42px;
      padding: 0 10px;
      margin-bottom: 20px;
      align-items: center;
      justify-content: center;
      border-radius: 9px;
      background: var(--rc-black);
      color: #fff;
      font-size: 12px;
      font-weight: 800;
      letter-spacing: .6px;
    }
    .rc-app-card h3 { margin-bottom: 6px; color: var(--rc-black); font-size: 17px; }
    .rc-app-card p { margin-bottom: 0; color: var(--rc-muted); font-size: 14px; }
    .rc-custom-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
    }
    .rc-custom-item {
      padding: 16px 18px;
      border: 1px solid var(--rc-line);
      border-radius: 10px;
      color: var(--rc-black);
      font-size: 14px;
      font-weight: 700;
    }
    .rc-custom-item:before { content: "+"; margin-right: 8px; color: var(--rc-red); font-weight: 900; }
    .rc-guide {
      display: grid;
      grid-template-columns: 1.1fr .9fr;
      gap: 20px;
      align-items: stretch;
    }
    .rc-guide-panel,
    .rc-guide-aside {
      padding: 32px;
      border-radius: 16px;
    }
    .rc-guide-panel { border: 1px solid var(--rc-line); background: #fff; }
    .rc-guide-aside { background: #fff5f6; }
    .rc-guide-list {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 11px;
      margin-top: 20px;
    }
    .rc-guide-list span {
      padding: 11px 13px;
      border-radius: 8px;
      background: var(--rc-light);
      color: #4e5359;
      font-size: 13px;
      font-weight: 700;
    }
    .rc-guide-aside h3 { color: var(--rc-black); font-size: 22px; }
    .rc-guide-aside p { color: #6d3d41; font-size: 14px; }
    .rc-faq { display: grid; gap: 11px; }
    .rc-faq-item {
      padding: 21px 22px;
      border: 1px solid var(--rc-line);
      border-radius: 12px;
      background: #fff;
    }
    .rc-faq-item h3 { margin-bottom: 7px; color: var(--rc-black); font-size: 17px; }
    .rc-faq-item p { margin-bottom: 0; color: var(--rc-muted); font-size: 14px; }
    .rc-final-cta {
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 30px;
      align-items: center;
      padding: 42px 46px;
      border-radius: 20px;
      background: linear-gradient(135deg, #e60012 0%, #b5000d 100%);
      color: #fff;
    }
    .rc-final-cta h2 { margin-bottom: 8px; color: #fff; font-size: 31px; }
    .rc-final-cta p { margin-bottom: 0; color: rgba(255,255,255,.82); }
    .rc-final-actions { display: flex; flex-wrap: wrap; gap: 10px; justify-content: flex-end; }
    .rc-final-cta .rc-btn-primary { background: #fff; color: var(--rc-red) !important; }
    .rc-final-cta .rc-btn-secondary { border-color: rgba(255,255,255,.6); }
    @media (max-width: 900px) {
      .rc-hero,
      .rc-overview,
      .rc-guide { grid-template-columns: 1fr; }
      .rc-hero-copy { padding: 48px 34px; }
      .rc-hero h2 { font-size: 38px; }
      .rc-hero-media { min-height: 420px; }
      .rc-stat-grid,
      .rc-construction-grid { grid-template-columns: repeat(2, 1fr); }
      .rc-app-grid,
      .rc-custom-grid { grid-template-columns: repeat(2, 1fr); }
      .rc-size-grid { grid-template-columns: 1fr; }
      .rc-final-cta { grid-template-columns: 1fr; }
      .rc-final-actions { justify-content: flex-start; }
    }
    @media (max-width: 620px) {
      .rc-product-detail { font-size: 15px; }
      .rc-hero { border-radius: 14px; }
      .rc-hero-copy { padding: 38px 22px; }
      .rc-hero h2 { font-size: 31px; }
      .rc-hero-media { min-height: 330px; }
      .rc-stat-grid,
      .rc-radius-grid,
      .rc-construction-grid,
      .rc-app-grid,
      .rc-custom-grid,
      .rc-guide-list { grid-template-columns: 1fr; }
      .rc-section { margin-bottom: 58px; }
      .rc-section h2 { font-size: 28px; }
      .rc-performance { padding: 32px 20px; }
      .rc-final-cta { padding: 34px 22px; }
      .rc-btn { width: 100%; }
    }