:root {
      --primary: #0b4f8a;
      --secondary: #2f9fe8;
      --light: #eef8ff;
      --soft: #f7fbff;
      --text: #17324d;
      --muted: #5f7488;
      --border: #d9ecfb;
      --white: #ffffff;
      --accent: #e7f5ff;
      --shadow: 0 18px 45px rgba(11, 79, 138, 0.12);
      --radius: 24px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: Arial, Helvetica, sans-serif;
      color: var(--text);
      background: linear-gradient(180deg, #ffffff 0%, #f2f9ff 55%, #ffffff 100%);
      line-height: 1.7;
    }

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

    a {
      color: var(--primary);
      text-decoration: none;
      font-weight: 700;
    }

    .co2-blog {
      width: 100%;
      overflow: hidden;
    }

    .container {
      width: min(1180px, calc(100% - 32px));
      margin: 0 auto;
    }

    .hero {
      position: relative;
      padding: 80px 0 70px;
      background:
        radial-gradient(circle at 15% 15%, rgba(47, 159, 232, 0.16), transparent 32%),
        radial-gradient(circle at 85% 5%, rgba(11, 79, 138, 0.10), transparent 30%),
        linear-gradient(135deg, #ffffff 0%, #ecf8ff 100%);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.05fr 0.95fr;
      gap: 48px;
      align-items: center;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      padding: 9px 16px;
      border-radius: 999px;
      background: rgba(47, 159, 232, 0.12);
      color: var(--primary);
      font-weight: 700;
      font-size: 14px;
      margin-bottom: 18px;
    }

    .eyebrow span {
      width: 8px;
      height: 8px;
      background: var(--secondary);
      border-radius: 50%;
      display: inline-block;
    }

    h1 {
      font-size: clamp(38px, 5vw, 66px);
      line-height: 1.08;
      margin: 0 0 22px;
      color: #082d52;
      letter-spacing: -1.4px;
    }

    .hero p {
      font-size: 18px;
      color: var(--muted);
      max-width: 650px;
      margin: 0 0 28px;
    }

    .hero-actions {
      display: flex;
      gap: 14px;
      flex-wrap: wrap;
      align-items: center;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 22px;
      border-radius: 999px;
      font-weight: 800;
      transition: 0.2s ease;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #fff;
      box-shadow: 0 14px 30px rgba(47, 159, 232, 0.24);
    }

    .btn-secondary {
      background: #fff;
      color: var(--primary);
      border: 1px solid var(--border);
    }

    .hero-card {
      background: rgba(255, 255, 255, 0.82);
      border: 1px solid var(--border);
      border-radius: 34px;
      padding: 18px;
      box-shadow: var(--shadow);
      backdrop-filter: blur(12px);
    }

    .hero-image-wrap {
      position: relative;
      width: 100%;
      aspect-ratio: 4 / 3;
      border-radius: 28px;
      overflow: hidden;
      background: linear-gradient(135deg, #dff3ff, #ffffff);
    }

    .hero-image-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .image-note {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
      margin-top: 14px;
    }

    .note {
      background: var(--soft);
      border: 1px solid var(--border);
      border-radius: 18px;
      padding: 14px;
      text-align: center;
      font-size: 13px;
      color: var(--muted);
    }

    .note strong {
      display: block;
      color: var(--primary);
      font-size: 15px;
      margin-bottom: 2px;
    }

    .toc-section {
      padding: 42px 0 20px;
    }

    .toc {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      padding: 28px;
      display: grid;
      grid-template-columns: 0.85fr 1.15fr;
      gap: 28px;
      align-items: start;
    }

    .toc h2 {
      margin: 0;
      color: var(--primary);
      font-size: 28px;
    }

    .toc p {
      margin: 10px 0 0;
      color: var(--muted);
    }

    .toc-links {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
    }

    .toc-links a {
      background: var(--light);
      border: 1px solid var(--border);
      padding: 13px 15px;
      border-radius: 14px;
      font-size: 15px;
      color: var(--text);
    }

    .content {
      padding: 50px 0;
    }

    .section {
      margin-bottom: 42px;
      background: rgba(255, 255, 255, 0.74);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: clamp(24px, 4vw, 42px);
      box-shadow: 0 12px 35px rgba(11, 79, 138, 0.07);
    }

    .section h2 {
      color: #082d52;
      font-size: clamp(26px, 3vw, 38px);
      line-height: 1.22;
      margin: 0 0 18px;
    }

    .section h3 {
      color: var(--primary);
      font-size: 22px;
      margin: 28px 0 12px;
    }

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

    .highlight {
      background: linear-gradient(135deg, #e9f7ff, #ffffff);
      border-left: 5px solid var(--secondary);
      padding: 20px;
      border-radius: 18px;
      margin: 24px 0;
      color: var(--text);
    }

    .benefit-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
      margin-top: 26px;
    }

    .benefit-card {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: 22px;
      padding: 22px;
      min-height: 190px;
    }

    .benefit-icon {
      width: 44px;
      height: 44px;
      border-radius: 14px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      margin-bottom: 14px;
    }

    .benefit-card h3 {
      font-size: 19px;
      margin: 0 0 10px;
      color: var(--primary);
    }

    .benefit-card p {
      font-size: 15px;
      margin: 0;
    }

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

    .image-box {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 14px 34px rgba(11, 79, 138, 0.08);
    }

    .image-box figure {
      margin: 0;
    }

    .image-box .ratio-43 {
      width: 100%;
      aspect-ratio: 4 / 3;
      background: var(--light);
      overflow: hidden;
    }

    .image-box .ratio-43 img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .image-box figcaption {
      padding: 14px 18px;
      font-size: 13px;
      color: var(--muted);
      background: #fff;
      border-top: 1px solid var(--border);
    }

    .table-wrap {
      overflow-x: auto;
      border-radius: 20px;
      border: 1px solid var(--border);
      margin-top: 22px;
      background: #fff;
    }

    table {
      width: 100%;
      border-collapse: collapse;
      min-width: 720px;
    }

    th, td {
      padding: 16px;
      text-align: left;
      border-bottom: 1px solid var(--border);
      vertical-align: top;
    }

    th {
      background: var(--light);
      color: var(--primary);
      font-size: 15px;
    }

    td {
      color: var(--muted);
      font-size: 15px;
    }

    tr:last-child td {
      border-bottom: none;
    }

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

    .check-list li {
      position: relative;
      background: #fff;
      border: 1px solid var(--border);
      border-radius: 16px;
      padding: 14px 16px 14px 46px;
      color: var(--muted);
    }

    .check-list li::before {
      content: "✓";
      position: absolute;
      left: 16px;
      top: 13px;
      width: 22px;
      height: 22px;
      border-radius: 50%;
      background: var(--secondary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 13px;
      font-weight: 900;
    }

    .warning {
      background: #fff7ed;
      border: 1px solid #fed7aa;
      color: #7c2d12;
      border-radius: 20px;
      padding: 20px;
      margin-top: 22px;
    }

    .warning strong {
      color: #9a3412;
    }

    .product-cta {
      background:
        radial-gradient(circle at 20% 20%, rgba(255,255,255,0.24), transparent 28%),
        linear-gradient(135deg, #082d52, #0b4f8a 48%, #2f9fe8);
      color: #fff;
      border-radius: 34px;
      padding: clamp(28px, 5vw, 52px);
      margin: 54px 0;
      display: grid;
      grid-template-columns: 1fr 0.75fr;
      gap: 36px;
      align-items: center;
      box-shadow: 0 22px 54px rgba(11, 79, 138, 0.24);
    }

    .product-cta h2 {
      margin: 0 0 14px;
      font-size: clamp(30px, 4vw, 46px);
      line-height: 1.15;
      color: #fff;
    }

    .product-cta p {
      margin: 0 0 22px;
      color: rgba(255,255,255,0.86);
    }

    .product-cta .btn {
      background: #fff;
      color: var(--primary);
      width: fit-content;
    }

    .product-card-mini {
      background: rgba(255,255,255,0.13);
      border: 1px solid rgba(255,255,255,0.22);
      border-radius: 26px;
      padding: 18px;
      backdrop-filter: blur(10px);
    }

    .product-card-mini .ratio-square {
      width: 100%;
      aspect-ratio: 1 / 1;
      border-radius: 20px;
      overflow: hidden;
      background: #fff;
    }

    .product-card-mini img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      padding: 10px;
      background: #fff;
    }

    .faq {
      display: grid;
      gap: 16px;
    }

    details {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: 18px;
      padding: 18px 20px;
    }

    summary {
      cursor: pointer;
      font-weight: 800;
      color: var(--primary);
    }

    details p {
      margin: 12px 0 0 !important;
    }

    .footer-note {
      padding: 34px 0 70px;
      text-align: center;
      color: var(--muted);
      font-size: 14px;
    }

    @media (max-width: 920px) {
      .hero-grid,
      .toc,
      .two-col,
      .product-cta {
        grid-template-columns: 1fr;
      }

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

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

    @media (max-width: 620px) {
      .hero {
        padding: 54px 0 42px;
      }

      .hero-actions {
        align-items: stretch;
      }

      .btn {
        width: 100%;
      }

      .image-note,
      .benefit-grid {
        grid-template-columns: 1fr;
      }

      .section {
        padding: 22px;
      }

      h1 {
        font-size: 36px;
      }
    }