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/* ==========================================================================
   AURORA HQ — Навигационный рельс глав (Chapter Rail) и виджет «Наверх»
   ========================================================================== */

/* 1. Кнопка «Наверх» (Scroll to top) */
.scroll-top-btn {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--white, #ffffff);
  border: 1px solid var(--line, #d1d7d4);
  color: var(--sage-dark, #596b53);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 99;
  box-shadow: 0 4px 14px rgba(8, 14, 27, 0.08);
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 0.25s ease, transform 0.25s ease, background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, color 0.2s ease;
}

.scroll-top-btn.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.scroll-top-btn:hover {
  background: var(--wash, #eaeee5);
  border-color: var(--sage, #94a88c);
  color: var(--focus, #3d5947);
  box-shadow: 0 6px 18px rgba(8, 14, 27, 0.15);
  transform: translateY(-2px);
}

.scroll-top-btn:active {
  transform: translateY(0);
  background: var(--sage-pale, #c5cfc0);
}

.scroll-top-btn:focus-visible {
  outline: 2px solid var(--focus, #3d5947);
  outline-offset: 2px;
}

/* 2. Навигационный рельс глав (Scrollspy Chapter Rail) — чистый минимализм и строгая центровка */
.chapter-rail {
  position: fixed;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 95;
  display: flex;
  flex-direction: column;
  align-items: center;
  user-select: none;
  background: transparent;
  border: none;
  box-shadow: none;
}

.rail-track {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 7px;
  padding: 0;
}

.rail-item {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  padding: 3px 0;
  text-decoration: none;
  cursor: pointer;
}

.rail-tick {
  display: block;
  width: 14px;
  height: 3px;
  border-radius: 2px;
  background-color: var(--line-dark, #a9b2ac);
  opacity: 0.55;
  transition: width 0.22s cubic-bezier(0.2, 0.8, 0.2, 1),
              background-color 0.22s ease,
              opacity 0.22s ease,
              box-shadow 0.22s ease;
}

/* Активная глава: удлиняется строго по центральной оси */
.rail-item.is-active .rail-tick {
  width: 32px;
  height: 4px;
  opacity: 1;
  background-color: var(--focus, #3d5947);
  box-shadow: 0 0 8px rgba(61, 89, 71, 0.35);
}

/* Соседние деликатные волны по центральной оси */
.rail-item.is-neighbor .rail-tick {
  width: 20px;
  opacity: 0.75;
  background-color: var(--sage-dark, #596b53);
}

/* Ховер состояние */
.rail-item:hover .rail-tick {
  width: 24px;
  opacity: 1;
  background-color: var(--sage-dark, #596b53);
}

.rail-item.is-active:hover .rail-tick {
  width: 34px;
  background-color: var(--focus, #3d5947);
}

/* Тултипы с названиями глав */
.rail-tooltip {
  position: absolute;
  right: calc(100% + 10px);
  top: 50%;
  transform: translateY(-50%) translateX(6px);
  background: var(--ink, #080e1b);
  color: #ffffff;
  font-family: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 12px;
  font-weight: 500;
  line-height: 1.3;
  padding: 5px 11px;
  border-radius: 6px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  box-shadow: 0 4px 14px rgba(8, 14, 27, 0.18);
  transition: opacity 0.18s ease, transform 0.18s ease;
  z-index: 100;
}

.rail-tooltip::after {
  content: "";
  position: absolute;
  left: 100%;
  top: 50%;
  transform: translateY(-50%);
  border-width: 4px;
  border-style: solid;
  border-color: transparent transparent transparent var(--ink, #080e1b);
}

.rail-item:hover .rail-tooltip {
  opacity: 1;
  transform: translateY(-50%) translateX(0);
}

/* Адаптивность для мобильных экранов */
@media (max-width: 800px) {
  .chapter-rail {
    right: 8px;
  }
  
  .rail-track {
    gap: 4px;
  }
  
  .rail-item {
    width: 22px;
    padding: 2px 0;
  }
  
  .rail-tick {
    width: 8px;
    height: 2px;
  }
  
  .rail-item.is-active .rail-tick {
    width: 18px;
    height: 3px;
  }
  
  .rail-item.is-neighbor .rail-tick {
    width: 12px;
  }
  
  .rail-tooltip {
    display: none;
  }
  
  .scroll-top-btn {
    right: 14px;
    bottom: 16px;
    width: 38px;
    height: 38px;
  }
}

/* ==========================================================================
   AURORA HQ — Математические формулы LaTeX (KaTeX)
   ========================================================================== */
.math-block {
  margin: 24px 0 26px;
  padding: 16px 20px;
  background: var(--white, #ffffff);
  border: 1px solid var(--line, #d1d7d4);
  border-left: 3.5px solid var(--sage-dark, #596b53);
  border-radius: 0 8px 8px 0;
  box-shadow: 0 2px 8px rgba(8, 14, 27, 0.03);
  overflow-x: auto;
  max-width: 76ch;
}

.math-block-title {
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted, #626d77);
  margin-bottom: 8px;
}

.math-block-tex {
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--ink, #080e1b);
}

.math-block-note {
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted, #626d77);
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px dashed rgba(209, 215, 212, 0.6);
}

.katex-display {
  margin: 0.6em 0 !important;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 4px 0;
}

/* --- Интерактивный разбор формул и переменных (Гибридный режим) --- */
.math-block {
  scroll-margin-top: 100px;
  transition: outline 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.math-block.math-return-highlight {
  outline: 2.5px solid var(--sage-dark, #596b53);
  box-shadow: 0 0 0 6px rgba(89, 107, 83, 0.18), 0 6px 18px rgba(8, 14, 27, 0.08);
}

.math-block-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.math-block-head .math-block-title {
  margin-bottom: 0;
}

.math-card-glossary-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-weight: 600;
  color: var(--sage-dark, #596b53);
  text-decoration: none;
  padding: 3px 8px;
  background: rgba(89, 107, 83, 0.08);
  border: 1px solid rgba(89, 107, 83, 0.2);
  border-radius: 4px;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.math-card-glossary-link:hover {
  background: var(--sage-dark, #596b53);
  color: #ffffff;
}

.math-breakdown {
  margin-top: 12px;
  border-top: 1px solid rgba(209, 215, 212, 0.7);
  padding-top: 10px;
}

.math-breakdown-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink, #080e1b);
  cursor: pointer;
  user-select: none;
  padding: 6px 0;
  list-style: none;
}

.math-breakdown-toggle::-webkit-details-marker {
  display: none;
}

.math-toggle-icon {
  font-size: 14px;
}

.math-toggle-text {
  flex: 1;
}

.math-toggle-chevron {
  color: var(--muted, #626d77);
  transition: transform 0.2s ease;
}

.math-breakdown[open] .math-toggle-chevron {
  transform: rotate(180deg);
}

.math-breakdown-body {
  padding-top: 12px;
  animation: mathFadeIn 0.25s ease;
}

@keyframes mathFadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.math-section {
  margin-bottom: 16px;
}

.math-section:last-child {
  margin-bottom: 0;
}

.math-section-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--muted, #626d77);
  margin: 0 0 8px 0;
}

.math-vars-grid {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: #f8faf9;
  border: 1px solid rgba(209, 215, 212, 0.7);
  border-radius: 6px;
  padding: 10px 14px;
}

.math-var-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 12.5px;
  line-height: 1.5;
}

.math-var-sym {
  display: inline-block;
  min-width: 58px;
  font-weight: 600;
  color: var(--ink, #080e1b);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  background: #ffffff;
  padding: 2px 6px;
  border: 1px solid var(--line, #d1d7d4);
  border-radius: 4px;
  text-align: center;
  flex-shrink: 0;
}

.math-var-desc {
  color: var(--ink, #080e1b);
}

.math-steps-list {
  margin: 0;
  padding-left: 20px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ink, #080e1b);
}

.math-steps-list li {
  margin-bottom: 5px;
}

.math-rationale-text {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ink, #080e1b);
  margin: 0;
  background: #fcfbf7;
  border-left: 3px solid #d4c59a;
  padding: 10px 14px;
  border-radius: 0 6px 6px 0;
}

.math-section-footer {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed rgba(209, 215, 212, 0.8);
}

.math-full-glossary-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--sage-dark, #596b53);
  text-decoration: none;
  padding: 6px 12px;
  background: rgba(89, 107, 83, 0.08);
  border: 1px solid rgba(89, 107, 83, 0.2);
  border-radius: 6px;
  transition: all 0.15s ease;
}

.math-full-glossary-btn:hover {
  background: var(--sage-dark, #596b53);
  color: #ffffff;
}