:root {
      --co2-navy: #123a56;
      --co2-blue: #167da8;
      --co2-cyan: #22a9c7;
      --co2-pale: #eef9fd;
      --co2-pale-2: #f7fcff;
      --co2-line: #cfe8f2;
      --co2-text: #294556;
      --co2-muted: #647b89;
      --co2-white: #ffffff;
      --co2-green: #167d72;
      --co2-shadow: 0 18px 48px rgba(23, 92, 124, .10);
    }

    * { box-sizing: border-box; }

    html { scroll-behavior: smooth; }

    body {
      margin: 0;
      background: #f4fbfe;
      color: var(--co2-text);
      font-family: Arial, Helvetica, sans-serif;
      font-size: 17px;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

    .co2-price-blog {
      overflow: hidden;
      background:
        radial-gradient(circle at 8% 5%, rgba(34, 169, 199, .12), transparent 24rem),
        linear-gradient(180deg, #f6fcff 0, #ffffff 32rem);
    }

    .co2-wrap {
      width: min(1160px, calc(100% - 36px));
      margin: 0 auto;
    }

    .co2-breadcrumb {
      padding: 24px 0 10px;
      color: var(--co2-muted);
      font-size: 14px;
    }

    .co2-breadcrumb a {
      color: var(--co2-blue);
      text-decoration: none;
    }

    .co2-hero {
      position: relative;
      padding: 56px 0 70px;
    }

    .co2-hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.35fr) minmax(310px, .65fr);
      gap: 44px;
      align-items: center;
    }

    .co2-kicker {
      display: inline-flex;
      align-items: center;
      gap: 9px;
      margin-bottom: 18px;
      padding: 8px 14px;
      border: 1px solid #bfe4ef;
      border-radius: 999px;
      background: rgba(255,255,255,.82);
      color: var(--co2-blue);
      font-size: 13px;
      font-weight: 700;
      letter-spacing: .07em;
      text-transform: uppercase;
    }

    .co2-kicker::before {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--co2-cyan);
      content: "";
      box-shadow: 0 0 0 5px rgba(34,169,199,.12);
    }

    .co2-hero h1 {
      max-width: 820px;
      margin: 0;
      color: var(--co2-navy);
      font-size: clamp(38px, 5vw, 66px);
      line-height: 1.08;
      letter-spacing: -.035em;
    }

    .co2-lead {
      max-width: 760px;
      margin: 24px 0 0;
      color: #496879;
      font-size: 20px;
      line-height: 1.65;
    }

    .co2-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 10px 22px;
      margin-top: 24px;
      color: var(--co2-muted);
      font-size: 14px;
    }

    .co2-answer-card {
      position: relative;
      padding: 30px;
      border: 1px solid rgba(143, 207, 225, .8);
      border-radius: 28px;
      background: rgba(255,255,255,.94);
      box-shadow: var(--co2-shadow);
    }

    .co2-answer-card::before {
      position: absolute;
      inset: 0 0 auto;
      height: 6px;
      border-radius: 28px 28px 0 0;
      background: linear-gradient(90deg, var(--co2-blue), var(--co2-cyan));
      content: "";
    }

    .co2-answer-card span {
      color: var(--co2-blue);
      font-size: 13px;
      font-weight: 700;
      letter-spacing: .08em;
      text-transform: uppercase;
    }

    .co2-price-big {
      margin: 10px 0 4px;
      color: var(--co2-navy);
      font-size: 40px;
      font-weight: 800;
      line-height: 1.2;
    }

    .co2-answer-card p {
      margin: 12px 0 0;
      color: #526e7d;
      font-size: 15px;
      line-height: 1.65;
    }

    .co2-toc {
      margin: 0 auto 56px;
      padding: 24px 28px;
      border: 1px solid var(--co2-line);
      border-radius: 20px;
      background: var(--co2-white);
      box-shadow: 0 10px 30px rgba(29, 97, 128, .06);
    }

    .co2-toc strong {
      display: block;
      margin-bottom: 10px;
      color: var(--co2-navy);
    }

    .co2-toc ol {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 4px 28px;
      margin: 0;
      padding-left: 22px;
    }

    .co2-toc a {
      color: var(--co2-blue);
      text-decoration: none;
    }

    .co2-layout {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 300px;
      gap: 42px;
      align-items: start;
      padding-bottom: 80px;
    }

    .co2-content {
      min-width: 0;
    }

    .co2-content section {
      scroll-margin-top: 24px;
      margin-bottom: 58px;
    }

    .co2-content h2 {
      margin: 0 0 20px;
      color: var(--co2-navy);
      font-size: clamp(27px, 3vw, 38px);
      line-height: 1.22;
      letter-spacing: -.02em;
    }

    .co2-content h3 {
      margin: 30px 0 12px;
      color: #164f6e;
      font-size: 22px;
      line-height: 1.35;
    }

    .co2-content p { margin: 0 0 18px; }

    .co2-content a {
      color: var(--co2-blue);
      text-decoration-thickness: 1px;
      text-underline-offset: 3px;
    }

    .co2-summary {
      padding: 26px 28px;
      border-left: 5px solid var(--co2-cyan);
      border-radius: 4px 18px 18px 4px;
      background: linear-gradient(135deg, #eaf8fd, #f9fdff);
    }

    .co2-summary strong { color: var(--co2-navy); }

    .co2-table-scroll {
      overflow-x: auto;
      margin: 26px 0;
      border: 1px solid var(--co2-line);
      border-radius: 18px;
      background: #fff;
      box-shadow: 0 10px 34px rgba(28, 93, 123, .06);
    }

    .co2-table {
      width: 100%;
      min-width: 690px;
      border-collapse: collapse;
    }

    .co2-table th,
    .co2-table td {
      padding: 17px 18px;
      border-bottom: 1px solid #e2f0f5;
      text-align: left;
      vertical-align: top;
    }

    .co2-table th {
      background: #eaf7fc;
      color: var(--co2-navy);
      font-size: 14px;
      line-height: 1.35;
    }

    .co2-table tr:last-child td { border-bottom: 0; }

    .co2-price {
      white-space: nowrap;
      color: var(--co2-blue);
      font-weight: 800;
    }

    .co2-note {
      margin-top: 16px;
      color: var(--co2-muted);
      font-size: 14px;
    }

    .co2-grid-2,
    .co2-grid-3 {
      display: grid;
      gap: 18px;
      margin: 26px 0;
    }

    .co2-grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .co2-grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

    .co2-feature {
      padding: 22px;
      border: 1px solid var(--co2-line);
      border-radius: 18px;
      background: var(--co2-white);
    }

    .co2-feature-number {
      display: inline-grid;
      width: 34px;
      height: 34px;
      place-items: center;
      border-radius: 10px;
      background: #e3f6fb;
      color: var(--co2-blue);
      font-size: 14px;
      font-weight: 800;
    }

    .co2-feature h3 {
      margin: 14px 0 8px;
      font-size: 19px;
    }

    .co2-feature p {
      margin: 0;
      color: #5d7583;
      font-size: 15px;
      line-height: 1.6;
    }

    .co2-checklist {
      margin: 22px 0;
      padding: 0;
      list-style: none;
    }

    .co2-checklist li {
      position: relative;
      margin: 10px 0;
      padding: 13px 16px 13px 46px;
      border: 1px solid #d9edf4;
      border-radius: 13px;
      background: #fbfeff;
    }

    .co2-checklist li::before {
      position: absolute;
      left: 16px;
      top: 13px;
      color: var(--co2-green);
      content: "✓";
      font-weight: 900;
    }

    .co2-formula {
      margin: 26px 0;
      padding: 28px;
      border-radius: 22px;
      background: linear-gradient(135deg, #103d59, #176d8e);
      color: #fff;
      box-shadow: var(--co2-shadow);
    }

    .co2-formula-label {
      color: #aee8f5;
      font-size: 13px;
      font-weight: 700;
      letter-spacing: .08em;
      text-transform: uppercase;
    }

    .co2-formula strong {
      display: block;
      margin-top: 8px;
      font-size: 23px;
      line-height: 1.45;
    }

    .co2-formula p {
      margin: 15px 0 0;
      color: #d7eff5;
      font-size: 15px;
    }

    .co2-cta {
      position: relative;
      overflow: hidden;
      padding: 38px;
      border: 1px solid #aaddeb;
      border-radius: 26px;
      background: linear-gradient(135deg, #e8f8fd 0%, #f9fdff 55%, #e2f5fb 100%);
    }

    .co2-cta::after {
      position: absolute;
      right: -70px;
      bottom: -85px;
      width: 220px;
      height: 220px;
      border: 32px solid rgba(34, 169, 199, .12);
      border-radius: 50%;
      content: "";
    }

    .co2-cta > * { position: relative; z-index: 1; }

    .co2-cta h2 { margin-bottom: 14px; }

    .co2-button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 52px;
      margin-top: 10px;
      padding: 13px 22px;
      border-radius: 12px;
      background: linear-gradient(90deg, var(--co2-blue), #179dbb);
      color: #fff !important;
      font-weight: 800;
      text-decoration: none !important;
      box-shadow: 0 10px 24px rgba(22, 125, 168, .22);
      transition: transform .2s ease, box-shadow .2s ease;
    }

    .co2-button:hover {
      transform: translateY(-2px);
      box-shadow: 0 14px 28px rgba(22, 125, 168, .28);
    }

    .co2-faq-item {
      margin: 12px 0;
      border: 1px solid var(--co2-line);
      border-radius: 15px;
      background: #fff;
    }

    .co2-faq-item summary {
      position: relative;
      padding: 19px 50px 19px 20px;
      color: var(--co2-navy);
      cursor: pointer;
      font-weight: 800;
      line-height: 1.45;
      list-style: none;
    }

    .co2-faq-item summary::-webkit-details-marker { display: none; }

    .co2-faq-item summary::after {
      position: absolute;
      right: 20px;
      top: 50%;
      color: var(--co2-blue);
      content: "+";
      font-size: 26px;
      font-weight: 400;
      transform: translateY(-50%);
    }

    .co2-faq-item[open] summary::after { content: "−"; }

    .co2-faq-answer {
      padding: 0 20px 19px;
      color: #526d7a;
    }

    .co2-faq-answer p { margin: 0; }

    .co2-sidebar {
      position: sticky;
      top: 24px;
    }

    .co2-side-card {
      margin-bottom: 20px;
      padding: 24px;
      border: 1px solid var(--co2-line);
      border-radius: 19px;
      background: #fff;
      box-shadow: 0 12px 30px rgba(20, 84, 113, .07);
    }

    .co2-side-card h2 {
      margin: 0 0 12px;
      color: var(--co2-navy);
      font-size: 20px;
      line-height: 1.35;
    }

    .co2-side-card p,
    .co2-side-card li {
      color: #5d7481;
      font-size: 14px;
      line-height: 1.6;
    }

    .co2-side-card ul {
      margin: 12px 0 0;
      padding-left: 19px;
    }

    .co2-source-list {
      padding-left: 22px;
      font-size: 14px;
    }

    .co2-source-list li { margin-bottom: 10px; }

    .co2-disclaimer {
      padding: 22px;
      border: 1px solid #ddeaf0;
      border-radius: 15px;
      background: #f8fbfc;
      color: #657b87;
      font-size: 13px;
      line-height: 1.65;
    }

    @media (max-width: 930px) {
      .co2-hero-grid,
      .co2-layout {
        grid-template-columns: 1fr;
      }

      .co2-answer-card { max-width: 620px; }
      .co2-sidebar { position: static; }
      .co2-grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    }

    @media (max-width: 680px) {
      body { font-size: 16px; }
      .co2-wrap { width: min(100% - 24px, 1160px); }
      .co2-hero { padding: 38px 0 48px; }
      .co2-hero-grid { gap: 28px; }
      .co2-hero h1 { font-size: 39px; }
      .co2-lead { font-size: 18px; }
      .co2-answer-card { padding: 25px 22px; }
      .co2-price-big { font-size: 33px; }
      .co2-toc { padding: 21px; }
      .co2-toc ol,
      .co2-grid-2,
      .co2-grid-3 {
        grid-template-columns: 1fr;
      }
      .co2-layout { gap: 20px; }
      .co2-content section { margin-bottom: 46px; }
      .co2-cta { padding: 28px 22px; }
      .co2-button { width: 100%; text-align: center; }
    }