:root {
      --primary: #000;
      --accent: #edf79c; /* красный акцент */
      --light-bg: #f9f9f9;
      --border: #ddd;
 --primary2: #000;
      --accent2: #ffcc00; /* жёлтый акцент */
      --light-bg2: #f9f9f9;
      --border2: #ddd;
    }

    .page-layout {
     
      gap: 1rem;
      margin-bottom: 2rem;
    }

    

    /* Заголовок "THE LEVEL UP SERIES: QUADS" */
    .series-title {
      font-size: 3rem;
      font-weight: 900;
      text-transform: uppercase;
      color: white;
      background: #f20713;
      padding: 0.5rem 1rem;
      border-radius: 8px;
      margin: 0 0 0.5rem;
      position: relative;
    }

    .series-title::before {
      content: "";
      position: absolute;
      top: -10px;
      left: 0;
      width: 100%;
      height: 10px;
      background: linear-gradient(to right, rgba(255,255,255,0), rgba(255,255,255,0.5));
    }

    .main-title {
      font-size: 6rem;
      font-weight: 900;
      text-transform: uppercase;
      color: white;
      margin: 0;
      letter-spacing: -2px;
      line-height: 0.9;
      text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
    }

    .intro-text {
      font-size: 0.95rem;
      margin: 0.5rem 0 1rem;
      padding-left: 1rem;
      border-left: 4px solid var(--accent);
      color: var(--primary);
    }

    .author {
      font-size: 0.75rem;
      color: #666;
      margin-bottom: 1rem;
      text-transform: uppercase;
    }

    .exercise-box {
      background-color: var(--accent);
      padding: 1rem;
      border-radius: 8px;
      margin: 1.5rem 0;
      position: relative;
    }

    .exercise-header {
      font-size: 1.1rem;
      font-weight: bold;
      color: white;
      margin-bottom: 0.5rem;
      display: flex;
      align-items: center;
    }

    .exercise-header::before {
      content: "■";
      margin-right: 0.5rem;
      font-size: 1.2rem;
    }

    .exercise-desc {
      font-size: 0.9rem;
      color: white;
      margin: 0.5rem 0;
    }

    .image-caption {
      font-size: 0.7rem;
      color: #999;
      text-align: right;
      margin-top: 1rem;
      padding-top: 1rem;
      border-top: 1px solid var(--border);
    }

    @media (max-width: 600px) {
      .series-title {
        font-size: 1.8rem;
      }
      .main-title {
        font-size: 2rem;
        line-height: 1;
      }
      .intro-text {
        font-size: 0.9rem;
        padding-left: 0.5rem;
      }
      .exercise-box {
        padding: 0.8rem;
      }
      .exercise-desc {
        font-size: 0.85rem;
      }
    }
 /* Заголовок "THE PARETO" */
    .pareto-title {
      font-size: 3rem;
      font-weight: 900;
      text-transform: uppercase;
      color: var(--primary);
      margin: 0 0 0.5rem;
      letter-spacing: -1px;
      position: relative;
    }

    .pareto-title::before {
      content: "T";
      position: absolute;
      top: 0;
      left: -10px;
      font-size: 4rem;
      font-weight: 900;
      color: var(--accent);
      opacity: 0.8;
      z-index: -1;
    }

    .pareto-text {
      font-size: 0.95rem;
      margin-bottom: 1.2rem;
      line-height: 1.6;
    }

    .exercise-box {
      background-color: var(--accent);
      padding: 1rem;
      border-radius: 8px;
      margin: 1.5rem 0;
      position: relative;
    }

    .exercise-header {
      font-size: 1.1rem;
      font-weight: bold;
      color: var(--primary);
      margin-bottom: 0.5rem;
      display: flex;
      align-items: center;
    }

    .exercise-header::before {
      content: "■";
      margin-right: 0.5rem;
      font-size: 1.2rem;
    }

    .exercise-desc {
      font-size: 0.9rem;
      color: var(--primary);
      margin: 0.5rem 0;
    }

    .program-table {
      width: 100%;
      border-collapse: collapse;
      margin: 1.2rem 0;
      font-size: 0.9rem;
    }

    .program-table th,
    .program-table td {
      padding: 0.6rem 0.4rem;
      text-align: left;
      border: 1px solid var(--border);
    }

    .program-table th {
      background-color: var(--accent);
      font-weight: bold;
      color: var(--primary);
    }

    .footnote {
      font-size: 0.85rem;
      color: #666;
      margin-top: 0.5rem;
      font-style: italic;
    }

    .image-caption {
      font-size: 0.7rem;
      color: #999;
      text-align: right;
      margin-top: 1rem;
      padding-top: 1rem;
      border-top: 1px solid var(--border);
    }

    @media (max-width: 600px) {
      .pareto-title {
        font-size: 2rem;
      }
      .pareto-text {
        font-size: 0.9rem;
      }
      .exercise-box {
        padding: 0.8rem;
      }
      .exercise-desc {
        font-size: 0.85rem;
      }
      .program-table {
        font-size: 0.75rem;
      }
      .program-table th,
      .program-table td {
        padding: 0.4rem 0.2rem;
      }
    }
.program-container {
      background: white;
      border: 2px solid var(--border2);
      border-radius: 12px;
      padding: 1.5rem;
      margin: 1.5rem 0;
    }

    .section-title {
      font-size: 1.8rem;
      font-weight: 900;
      text-transform: uppercase;
      color: var(--primary2);
      margin: 0 0 1rem;
      letter-spacing: -0.5px;
      border-bottom: 2px solid var(--accent2);
      padding-bottom: 0.3rem;
    }

    .directions {
      font-size: 0.95rem;
      margin: 0.5rem 0;
      line-height: 1.5;
      color: #666;
      font-style: italic;
    }

    .exercise-table {
      width: 100%;
      border-collapse: collapse;
      margin: 1.2rem 0;
      font-size: 0.9rem;
    }

    .exercise-table th,
    .exercise-table td {
      padding: 0.6rem 0.4rem;
      text-align: left;
      border: 1px solid var(--border2);
    }

    .exercise-table th {
      background-color: var(--accent2);
      font-weight: bold;
      color: var(--primary2);
    }

    .footnote {
      font-size: 0.85rem;
      color: #666;
      margin-top: 0.5rem;
      font-style: italic;
    }

    @media (max-width: 600px) {
      .section-title {
        font-size: 1.5rem;
      }
      .directions,
      .exercise-table {
        font-size: 0.85rem;
      }
      .exercise-table th,
      .exercise-table td {
        padding: 0.4rem 0.2rem;
      }
    }