/*
 * Глобальный граф знаний портала.
 * Визуальный язык согласован с локальным графом курса (.course-graph),
 * но панель самостоятельная: полноэкранная на мобильных, с боковой карточкой на десктопе.
 * Цвета берутся из переменных портала, поэтому тёмная и светлая темы работают сами.
 */

.kgraph {
  inset: 0;
  position: fixed;
  z-index: 80;
}

.kgraph[hidden] {
  display: none;
}

.kgraph__backdrop {
  background: var(--course-page-overlay, rgba(7, 9, 13, 0.9));
  inset: 0;
  position: absolute;
}

.kgraph__dialog {
  background: var(--course-surface);
  border: 1px solid var(--course-line);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  left: 50%;
  max-height: min(92vh, 900px);
  overflow: hidden;
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: min(96vw, 1280px);
}

/* ---------- шапка ---------- */

.kgraph__header {
  align-items: flex-start;
  border-bottom: 1px solid var(--course-line);
  display: flex;
  gap: 16px;
  justify-content: space-between;
  padding: 16px 20px;
}

.kgraph__heading h2 {
  font-size: 19px;
  margin: 2px 0 0;
}

.kgraph__heading p {
  color: var(--course-muted);
  font-size: 13px;
  margin: 6px 0 0;
  max-width: 62ch;
}

.kgraph__icon-button {
  align-items: center;
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: 6px;
  color: var(--course-text);
  cursor: pointer;
  display: inline-flex;
  flex-shrink: 0;
  font-size: 15px;
  justify-content: center;
  line-height: 1;
  min-height: 30px;
  min-width: 30px;
  padding: 5px;
}

.kgraph__icon-button:hover {
  background: var(--course-control-hover);
  border-color: var(--course-line-strong);
}

.kgraph__icon-button:active {
  background: var(--course-control-active);
}

/* ---------- панель инструментов ---------- */

.kgraph__toolbar {
  align-items: center;
  border-bottom: 1px solid var(--course-line);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  justify-content: space-between;
  padding: 10px 20px;
}

.kgraph__crumbs {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  min-width: 0;
}

.kgraph__crumb {
  background: none;
  border: none;
  border-radius: 5px;
  color: var(--course-cyan);
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  padding: 3px 6px;
}

.kgraph__crumb:hover {
  background: var(--course-control-hover);
}

.kgraph__crumb.is-current {
  color: var(--course-text);
  cursor: default;
  font-weight: 600;
}

.kgraph__crumb-sep {
  color: var(--course-subtle);
  font-size: 12px;
}

.kgraph__tools {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.kgraph__search {
  align-items: center;
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: 6px;
  color: var(--course-muted);
  display: flex;
  gap: 6px;
  padding: 0 8px;
}

.kgraph__search input {
  background: none;
  border: none;
  color: var(--course-text);
  font: inherit;
  font-size: 13px;
  outline: none;
  padding: 6px 0;
  width: 168px;
}

.kgraph__search input::placeholder {
  color: var(--course-subtle);
}

.kgraph__chip {
  align-items: center;
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: 6px;
  color: var(--course-muted);
  cursor: pointer;
  display: inline-flex;
  font: inherit;
  font-size: 13px;
  gap: 6px;
  padding: 5px 10px;
}

.kgraph__chip:hover {
  background: var(--course-control-hover);
  color: var(--course-text);
}

.kgraph__chip.is-active {
  border-color: var(--course-cyan);
  color: var(--course-cyan);
}

.kgraph__chip:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.kgraph__chip:disabled:hover {
  background: var(--course-control);
  color: var(--course-muted);
}

/* ---------- порог тематических связей ---------- */

.kgraph__strength {
  align-items: center;
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: 6px;
  color: var(--course-muted);
  display: flex;
  flex-wrap: wrap;
  font-size: 12px;
  gap: 6px;
  padding: 4px 10px;
}

.kgraph__strength label {
  cursor: pointer;
  white-space: nowrap;
}

.kgraph__strength input[type='range'] {
  accent-color: var(--course-cyan);
  cursor: pointer;
  height: 18px;
  width: 84px;
}

.kgraph__strength input[type='range']:focus-visible {
  outline: 2px solid var(--course-focus);
  outline-offset: 2px;
}

.kgraph__strength-value {
  color: var(--course-subtle);
  font-family: var(--course-mono);
  font-size: 11px;
  white-space: nowrap;
}

/* ---------- тело ---------- */

.kgraph__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 360px);
  min-height: 0;
  overflow: hidden;
}

.kgraph__stage {
  display: flex;
  flex-direction: column;
  min-height: 0;
  min-width: 0;
  padding: 10px 10px 8px;
  position: relative;
}

.kgraph__canvas {
  cursor: grab;
  flex: 1;
  min-height: 260px;
  min-width: 0;
  overflow: hidden;
  touch-action: none;
}

.kgraph__canvas.is-dragging {
  cursor: grabbing;
}

.kgraph__svg {
  display: block;
  height: 100%;
  width: 100%;
}

/* Загрузка и ошибка: перекрывает холст, пока данных нет. */
.kgraph__overlay {
  align-items: center;
  background: var(--course-surface);
  display: flex;
  flex-direction: column;
  gap: 12px;
  inset: 0;
  justify-content: center;
  padding: 24px;
  position: absolute;
  text-align: center;
  z-index: 2;
}

.kgraph__overlay[hidden] {
  display: none;
}

.kgraph__overlay-text {
  color: var(--course-muted);
  font-size: 14px;
  margin: 0;
  max-width: 42ch;
}

.kgraph__zoom {
  display: flex;
  flex-direction: column;
  gap: 4px;
  position: absolute;
  right: 18px;
  top: 18px;
}

.kgraph__hint,
.kgraph__status {
  color: var(--course-subtle);
  font-size: 12px;
  margin: 4px 0 0;
  text-align: center;
}

.kgraph__status {
  color: var(--course-muted);
  font-family: var(--course-mono);
  font-size: 11px;
  margin: 2px 0 0;
}

/* ---------- рёбра ---------- */

.kgraph__edge {
  fill: none;
  stroke: var(--course-line-strong);
  stroke-width: 1.1;
}

.kgraph__edge--hier {
  opacity: 0.75;
}

.kgraph__edge--spoke {
  opacity: 0.32;
  stroke-dasharray: 2 4;
}

.kgraph__edge--seq {
  opacity: 0.9;
  stroke: var(--course-cyan);
  stroke-width: 1.6;
}

/* Общая тема треков. */
.kgraph__edge--tag {
  opacity: 0.45;
  stroke: var(--course-purple);
  stroke-dasharray: 5 5;
  stroke-width: var(--kg-w, 1.2px);
}

/* Общие теги двух материалов: чем больше общих тегов, тем толще линия. */
.kgraph__edge--art {
  opacity: 0.5;
  stroke: var(--course-green);
  stroke-linecap: round;
  stroke-width: var(--kg-w, 1.2px);
}

.kgraph__edge.is-active {
  opacity: 1;
  stroke: var(--course-cyan);
  stroke-width: calc(var(--kg-w, 1.1px) + 1.1px);
}

/* ---------- узлы ---------- */

.kgraph__node {
  cursor: pointer;
  outline: none;
}

.kgraph__node-halo {
  fill: none;
  stroke: none;
}

.kgraph__node-dot {
  fill: var(--course-control);
  stroke: var(--kg-accent, var(--course-line-strong));
  stroke-width: 1.6;
  transition: fill 0.15s ease, stroke-width 0.15s ease;
}

.kgraph__node-badge {
  fill: var(--course-text);
  font-family: var(--course-mono);
  font-size: 11px;
  pointer-events: none;
}

.kgraph__node--root .kgraph__node-dot,
.kgraph__node--stage .kgraph__node-dot {
  fill: var(--course-surface-raised, var(--course-control));
  stroke-width: 2;
}

.kgraph__node:hover .kgraph__node-dot {
  fill: var(--course-control-hover);
  stroke-width: 2.4;
}

.kgraph__node.is-selected .kgraph__node-dot {
  stroke: var(--kg-accent, var(--course-cyan));
  stroke-width: 3;
}

.kgraph__node.is-selected .kgraph__node-halo {
  fill: var(--kg-accent, var(--course-cyan));
  opacity: 0.14;
}

/* «Вы здесь» — кольцо вокруг текущего трека и текущей статьи. */
.kgraph__node.is-current .kgraph__node-halo {
  fill: none;
  opacity: 0.9;
  stroke: var(--course-cyan);
  stroke-dasharray: 3 3;
  stroke-width: 1.6;
}

.kgraph__node.is-current .kgraph__node-dot {
  fill: var(--course-cyan);
  stroke: var(--course-cyan);
}

.kgraph__node.is-current .kgraph__node-badge {
  fill: var(--course-bg);
  font-weight: 700;
}

.kgraph__node.is-dim .kgraph__node-dot {
  opacity: 0.55;
}

.kgraph__node.is-faded {
  opacity: 0.16;
}

.kgraph__node.is-match .kgraph__node-dot {
  stroke: var(--course-orange);
  stroke-width: 2.6;
}

.kgraph__node:focus-visible .kgraph__node-halo,
.kgraph__node:focus .kgraph__node-halo {
  fill: none;
  stroke: var(--course-focus, var(--course-cyan));
  stroke-width: 2.4;
}

/* ---------- подписи ---------- */

.kgraph__label {
  fill: var(--course-muted);
  paint-order: stroke fill;
  pointer-events: none;
  stroke: var(--course-surface);
  stroke-linejoin: round;
  stroke-width: 3.5px;
}

.kgraph__label.is-current,
.kgraph__label.is-selected {
  fill: var(--course-text);
  font-weight: 600;
}

.kgraph__label.is-faded {
  opacity: 0.2;
}

/* ---------- боковая карточка ---------- */

.kgraph__side {
  border-left: 1px solid var(--course-line);
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 0;
  overflow-y: auto;
  padding: 16px;
}

.kgraph__card-kicker {
  color: var(--course-subtle);
  display: block;
  font-family: var(--course-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.kgraph__card-title {
  font-size: 17px;
  line-height: 1.3;
  margin: 6px 0 0;
}

.kgraph__card-meta {
  color: var(--course-muted);
  display: flex;
  flex-wrap: wrap;
  font-size: 12px;
  gap: 10px;
  margin: 8px 0 0;
}

.kgraph__card-text {
  color: var(--course-muted);
  font-size: 13px;
  line-height: 1.55;
  margin: 10px 0 0;
}

.kgraph__card-note {
  color: var(--course-subtle);
  font-size: 12px;
}

.kgraph__badge {
  background: var(--course-cyan);
  border-radius: 999px;
  color: var(--course-bg);
  font-size: 11px;
  font-weight: 700;
  padding: 1px 8px;
}

.kgraph__card-block {
  border-top: 1px solid var(--course-line);
  margin-top: 14px;
  padding-top: 12px;
}

.kgraph__card-block h4 {
  color: var(--course-subtle);
  font-size: 12px;
  margin: 0 0 8px;
  text-transform: uppercase;
}

.kgraph__card-empty p {
  color: var(--course-muted);
  font-size: 13px;
  line-height: 1.55;
  margin: 8px 0 12px;
}

.kgraph__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.kgraph__tag {
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: 999px;
  color: var(--course-muted);
  cursor: pointer;
  font: inherit;
  font-size: 12px;
  padding: 3px 10px;
  text-decoration: none;
}

.kgraph__tag:hover {
  background: var(--course-control-hover);
  border-color: var(--course-line-strong);
  color: var(--course-text);
}

.kgraph__tag--mini {
  border-radius: 4px;
  font-size: 11px;
  padding: 1px 6px;
}

/* ---------- связанные материалы ---------- */

.kgraph__rel {
  display: flex;
  flex-direction: column;
  gap: 10px;
  list-style: none;
  margin: 0 0 10px;
  padding: 0;
}

.kgraph__rel-item {
  border-left: 2px solid var(--course-line);
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding-left: 10px;
}

.kgraph__rel-item:hover {
  border-left-color: var(--course-green);
}

.kgraph__rel-title {
  color: var(--course-text);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
}

.kgraph__rel-title:hover {
  color: var(--course-cyan);
  text-decoration: underline;
}

.kgraph__rel-meta {
  color: var(--course-subtle);
  font-size: 11px;
}

.kgraph__rel-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 2px;
}

.kgraph__rel-graph {
  align-self: flex-start;
  background: none;
  border: none;
  color: var(--course-cyan);
  cursor: pointer;
  font: inherit;
  font-size: 11px;
  margin-top: 2px;
  padding: 2px 0;
  text-align: left;
}

.kgraph__rel-graph:hover {
  text-decoration: underline;
}

.kgraph__card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.kgraph__button {
  background: var(--course-control);
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  color: var(--course-text);
  cursor: pointer;
  display: inline-flex;
  font: inherit;
  font-size: 13px;
  padding: 6px 12px;
  text-decoration: none;
}

.kgraph__button:hover {
  background: var(--course-control-hover);
  border-color: var(--course-line-strong);
}

.kgraph__button--primary {
  background: var(--course-cyan);
  border-color: var(--course-cyan);
  color: var(--course-bg);
  font-weight: 600;
}

.kgraph__button--primary:hover {
  background: var(--course-cyan);
  color: var(--course-bg);
  filter: brightness(1.08);
}

/* ---------- результаты фильтра ---------- */

.kgraph__results {
  border: 1px solid var(--course-line);
  border-radius: var(--course-radius);
  padding: 10px 12px;
}

.kgraph__results[hidden] {
  display: none;
}

.kgraph__results-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  list-style: none;
  margin: 8px 0 0;
  max-height: 210px;
  overflow-y: auto;
  padding: 0;
}

.kgraph__results-list button {
  background: none;
  border: none;
  border-radius: 5px;
  color: var(--course-text);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  font: inherit;
  gap: 1px;
  padding: 5px 6px;
  text-align: left;
  width: 100%;
}

.kgraph__results-list button:hover {
  background: var(--course-control-hover);
}

.kgraph__results-list b {
  font-size: 13px;
  font-weight: 500;
}

.kgraph__results-list span {
  color: var(--course-subtle);
  font-size: 11px;
}

/* ---------- текстовая альтернатива ---------- */

.kgraph__fallback {
  border-top: 1px solid var(--course-line);
  margin-top: auto;
  padding-top: 12px;
}

.kgraph__fallback > summary {
  color: var(--course-muted);
  cursor: pointer;
  font-size: 13px;
}

.kgraph__fallback nav {
  margin-top: 10px;
  max-height: 340px;
  overflow-y: auto;
}

.kgraph__fallback ol,
.kgraph__fallback ul {
  list-style: none;
  margin: 0;
  padding: 0 0 0 10px;
}

.kgraph__fallback-stages > li {
  margin-bottom: 10px;
}

.kgraph__fallback-stage {
  color: var(--course-text);
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 4px;
}

.kgraph__fallback-stage b {
  color: var(--course-cyan);
  font-family: var(--course-mono);
  margin-right: 6px;
}

.kgraph__fallback a {
  color: var(--course-muted);
  font-size: 12px;
  line-height: 1.7;
  text-decoration: none;
}

.kgraph__fallback a:hover {
  color: var(--course-cyan);
  text-decoration: underline;
}

.kgraph__fallback-count {
  color: var(--course-subtle);
  font-family: var(--course-mono);
  font-size: 11px;
  margin-left: 5px;
}

/* Без JS граф не построить — показываем сразу списочную навигацию. */
html.no-js .kgraph__stage,
html.no-js .kgraph__toolbar {
  display: none;
}

/* ---------- мобильная версия ---------- */

@media (max-width: 900px) {
  .kgraph__dialog {
    border: none;
    border-radius: 0;
    height: 100%;
    left: 0;
    max-height: none;
    top: 0;
    transform: none;
    width: 100%;
  }

  .kgraph__body {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: minmax(240px, 1fr) auto;
    overflow-y: auto;
  }

  .kgraph__side {
    border-left: none;
    border-top: 1px solid var(--course-line);
    max-height: 46vh;
  }

  .kgraph__heading p {
    display: none;
  }

  .kgraph__hint {
    display: none;
  }

  .kgraph__search input {
    width: 120px;
  }

  /* Точные пороги остаются в строке состояния под холстом. */
  .kgraph__strength-value {
    display: none;
  }

  .kgraph__strength input[type='range'] {
    width: 64px;
  }

  .kgraph__status {
    text-align: left;
  }
}

@media (prefers-reduced-motion: reduce) {
  .kgraph__node-dot {
    transition: none;
  }
}