.back-header {
  background: #222;
  color: white;
  font-family: 'Arial Black', sans-serif;
  padding: 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

/* Верхний блок */
.header-top {
  background-color: #0d47a1;
  padding: 15px 0;
  font-size: 3vw;
  letter-spacing: -1px;
  text-transform: uppercase;
  margin-bottom: 10px;
}

/* Центральный блок */
.header-mid {
  background-color: black;
  padding: 10px 0;
  font-size: 2vw;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 10px;
}

/* Главное слово "BACK" */
.header-back {
  background-color: #0d47a1;
  color: #ffca28;
  font-size: 8vw;
  line-height: 0.9;
  letter-spacing: -2px;
  padding: 15px 0;
  font-weight: bold;
  text-transform: uppercase;
  margin-bottom: 15px;
}

/* Подзаголовок */
.subtitle {
  background: white;
  color: #222;
  padding: 15px;
  margin: 15px auto;
  max-width: 90%;
  font-size: 1.5vw;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  line-height: 1.4;
  font-weight: bold;
}

/* Авторы */
.authors {
  font-size: 1.2vw;
  margin-top: 15px;
  text-align: right;
  font-weight: normal;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  opacity: 0.8;
}

/* Адаптивность */
@media (max-width: 768px) {
  .header-top { font-size: 6vw; }
  .header-mid { font-size: 4vw; }
  .header-back { font-size: 12vw; }
  .subtitle { font-size: 3.5vw; padding: 10px; }
  .authors { font-size: 2.5vw; }
}
 h1 {
      text-align: center;
      color: #0d47a1;
      font-size: 2.4rem;
      margin: 30px 0 20px;
    }

    .section {
      background: white;
      padding: 25px;
      border-radius: 10px;
      box-shadow: 0 2px 10px rgba(0,0,0,0.05);
      margin-bottom: 30px;
    }

    h2 {
      color: #c62828;
      margin-top: 25px;
      font-size: 1.6rem;
    }

    blockquote {
      background: #e3f2fd;
      border-left: 4px solid #1976d2;
      padding: 15px;
      margin: 20px 0;
      font-style: italic;
      color: #0d47a1;
    }

    table {
      width: 100%;
      border-collapse: collapse;
      margin: 20px 0;
    }

    th, td {
      padding: 12px;
      text-align: left;
      border-bottom: 1px solid #eee;
    }

    th {
      background-color: #bbdefb;
      color: #0d47a1;
    }

    tr:hover {
      background-color: #f5fbff;
    }

    .split-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 15px;
      margin: 20px 0;
    }

    .split-day {
      background: #e8f5e9;
      padding: 12px;
      border-radius: 6px;
      font-weight: bold;
      color: #1b5e20;
    }

    .tip-box {
      background: #fff8e1;
      padding: 15px;
      border-radius: 8px;
      margin: 20px 0;
      border-left: 4px solid #ffa000;
    }

    @media (max-width: 600px) {
      h1 { font-size: 1.8rem; }
      h2 { font-size: 1.4rem; }
    }
.profile {
      background: #f1f8e9;
      padding: 20px;
      border-radius: 10px;
      margin: 25px 0;
    }

    .profile h3 {
      margin-top: 0;
      color: #2e7d32;
    }

    ul {
      padding-left: 20px;
    }

    li {
      margin-bottom: 6px;
    }