:root {
  /* ---------- Colors ---------- */
  --main-bg-color: #f9fafb;
  --main-text-color: #333;

  /* ---------- Font Sizes ---------- */
  --main-font-size: 1rem;
  --main-font-size-mobile: 0.95rem;

  /* ---------- Spacing ---------- */
  --main-padding: 10px;
  --main-margin-vertical: 20px;
  --main-max-width: 900px;

  /* ---------- Breakpoints ---------- */
  --main-mobile-breakpoint: 600px;
}

/* -----------------------
   Main Container
-------------------------*/
main {
  max-width: var(--main-max-width); /* limit max width */
  margin: var(--main-margin-vertical) auto; /* vertical spacing + horizontal centering */
  padding: var(--main-padding); /* inner spacing */
  background-color: var(--main-bg-color);
  color: var(--main-text-color);
  font-size: var(--main-font-size);
  line-height: 1.6; /* improve readability */
  box-sizing: border-box; /* include padding in width calculations */
}

/* -----------------------
   Responsive Styles
   for screens <= 600px
-------------------------*/
@media (max-width: var(--main-mobile-breakpoint)) {
  main {
    font-size: var(--main-font-size-mobile);
    padding: calc(var(--main-padding) / 2);
    margin: 10px auto; /* reduce vertical spacing on small screens */
  }
}

/* -----------------------
   Styles for Mini Table of Contents
-------------------------*/
.mini-toc {
  background: #e0f2fe;
  border: 1px solid #93c5fd;
  border-radius: 8px;
  padding: 16px;
  margin: 20px auto 24px; /* added top margin to account for fixed header */
  font-size: 20px;
  max-width: 900px; /* optional: limit width and center */
  box-sizing: border-box;
}

.mini-toc h3 {
  margin-top: 0;
  font-size: 20px;
  color: #1e3a8a;
}

.mini-toc ul {
  list-style-type: none;
  padding-left: 0;
  margin: 0;
}

.mini-toc li {
  margin: 8px 0;
}

.mini-toc a {
  text-decoration: none;
  color: #2563eb;
  font-weight: bold;
  transition: color 0.2s ease;
}

.mini-toc a:hover {
  color: #1e40af;
  text-decoration: underline;
}

/* ========================
   Mobile adaptation for Mini Table of Contents
======================== */
@media (max-width: 768px) {
  .mini-toc {
    font-size: 18px;      /* чуть меньше шрифт на планшетах */
    padding: 14px 16px;   /* уменьшаем внутренние отступы */
    margin: 20px auto 20px; /* уменьшаем верхний margin */
  }

  .mini-toc h3 {
    font-size: 18px;
  }
}

@media (max-width: 480px) {
  .mini-toc {
    font-size: 16px;      /* маленький шрифт на телефонах */
    padding: 10px 12px;
    margin: 20px 10px 16px; /* адаптируем отступы по краям */
  }

  .mini-toc h3 {
    font-size: 16px;
  }

  .mini-toc li {
    margin: 6px 0;        /* уменьшаем расстояние между пунктами */
  }
}