/* Skill-tree graph app. Shared across ferdighetstraer, every matte-* course
   page, and fysikk1. Design tokens (--bg, --surface, --border, --accent,
   --text, --text-muted, --radius and friends) come from /css/tokens.css,
   loaded before this file. */

:root {
  /* Node backgrounds are opaque (blended into --bg via color-mix, not layered
     as translucent rgba) so the edge lines behind a node never show through
     its card - only rgba here would let them bleed through the fill. */
  --begrep-bg: color-mix(in srgb, var(--bg) 92%, #5E6E96 8%);
  --begrep-border: rgba(94, 110, 150, 0.5);

  --ferdighet-bg: color-mix(in srgb, var(--bg) 93%, #C1710B 7%);
  --ferdighet-border: rgba(193, 113, 11, 0.5);

  --locked-opacity: 0.45;

  --column-alt: rgba(20, 16, 10, 0.03);
  --danger-soft: #B91C1C;

  --del1: #5E6E96;
  --del2: #B9702F;
}

html[data-theme="dark"] {
  --begrep-bg: color-mix(in srgb, var(--bg) 86%, #93A5D6 14%);
  --begrep-border: rgba(147, 165, 214, 0.5);

  --ferdighet-bg: color-mix(in srgb, var(--bg) 86%, #E8A15E 14%);
  --ferdighet-border: rgba(232, 161, 94, 0.55);

  --column-alt: rgba(255, 255, 255, 0.06);
  --danger-soft: #FCA5A5;
}

html, body { height: 100%; }

a { color: var(--accent); }

/* Den opprinnelige <header> er tømt av ensureActionMenu() (se engine.js) -
   ALT innholdet dens (tilbake-lenke, dag/natt-knapp, fremdriftslinje,
   tittel, undertekst) flyttes inn i #action-menu-panel, slik at grafen kan
   fylle hele skjermhøyden. Skjules derfor unconditionally her i CSS (ikke
   bare via JS) for å unngå et glimt av den gamle headeren før JS rekker å
   flytte innholdet. */
header {
  display: none;
}

.theme-toggle {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: none;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
  flex-shrink: 0;
}
.theme-toggle:hover, .theme-toggle:focus-visible { color: var(--text); border-color: var(--border-strong); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-moon { display: none; }
html[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
html[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

.back-link {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, color 0.2s;
}

.back-link:hover, .back-link:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* Meny-knapp nederst til venstre, til venstre for zoom-knappene i
   #bottom-toolbar (se setupZoom/getBottomToolbar i engine.js) - IKKE øverst
   til høyre, siden den da nesten overlappet tilbake-knappen i detaljpanelet
   når det er åpent på mobil (begge endte i samme hjørne). Slår ut
   #action-menu-panel, som ensureActionMenu() (engine.js) fyller med ALT som
   før lå i headeren: tilbake-lenke + dag/natt-knapp (#menu-nav-row),
   fremdriftslinje, tittel/undertekst, og til slutt de sjeldnere brukte
   knappene (læringsmål-liste, prøvegenerator, motivasjon). Selve #menu-wrap
   er bare et ankerpunkt for panelet - #bottom-toolbar (fixed) gir selve den
   flytende posisjoneringen. Hjelp-knappen (#help-btn, se under) står som
   egen knapp rett til høyre for #menu-wrap, IKKE inni panelet - se
   setupHelpButton i engine.js. */
#menu-wrap {
  position: relative;
}

#menu-toggle-btn {
  width: 2.6rem;
  height: 2.6rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.35);
  transition: background 0.15s ease, border-color 0.15s ease;
}

#menu-toggle-btn svg { width: 18px; height: 18px; }

#menu-toggle-btn:hover, #menu-toggle-btn[aria-expanded="true"] {
  border-color: var(--border-strong);
  background: var(--surface-hover);
}

/* Hjelp-knappen («?») står som egen, alltid synlig knapp rett til høyre for
   #menu-toggle-btn (se setupHelpButton i engine.js) - IKKE inni
   #action-menu-panel som de andre sjeldnere brukte knappene, siden dette er
   det første en ny bruker trenger å finne. */
#help-btn {
  width: 2.6rem;
  height: 2.6rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.35);
  transition: background 0.15s ease, border-color 0.15s ease;
}

#help-btn:hover, #help-btn:focus-visible {
  border-color: var(--border-strong);
  background: var(--surface-hover);
}

#action-menu-panel {
  display: none;
  flex-direction: column;
  gap: 0.6rem;
  position: absolute;
  bottom: calc(100% + 0.5rem);
  left: 0;
  z-index: 30;
  width: min(320px, calc(100vw - 2.4rem));
  max-height: calc(100vh - 5rem);
  overflow-y: auto;
  padding: 0.8rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

#action-menu-panel.open { display: flex; }

#menu-nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border);
}

#action-menu-panel h1 {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

#action-menu-panel p.tagline {
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.5;
}

#action-menu-panel #motivation-btn,
#action-menu-panel #goal-index-btn {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  padding: 0.55rem 0.9rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
  width: 100%;
  text-align: left;
  white-space: normal;
  transition: background 0.15s ease, border-color 0.15s ease;
}

#action-menu-panel #motivation-btn:hover,
#action-menu-panel #goal-index-btn:hover {
  border-color: var(--border-strong);
  background: var(--surface-hover);
}

.progress-row {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border);
}

.progress-bar {
  flex: 1;
  max-width: 420px;
  height: 8px;
  background: var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent-grad);
  width: 0%;
  transition: width 0.3s ease;
}

.progress-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  white-space: nowrap;
}

#error-banner {
  display: none;
  background: rgba(220, 38, 38, 0.12);
  border-bottom: 1px solid rgba(220, 38, 38, 0.4);
  color: var(--danger-soft);
  font-size: 0.85rem;
  padding: 0.8rem 2rem;
  white-space: pre-wrap;
}

#error-banner.visible { display: block; }

main {
  flex: 1;
  display: flex;
  min-height: 0;
  width: 100%;
}

#graph-scroll {
  flex: 1;
  min-width: 0;
  overflow: auto;
  /* Lite padding-top - headeren er borte (se ensureActionMenu), så det er
     ikke lenger noe å holde grafen klar av der. Resten av avstanden til
     første kolonneoverskrift kommer fra LAYOUT.padding i selve
     layout-algoritmen (se computeGlobalRowStarts/layoutColumn). */
  padding: 0.75rem 2rem 2.4rem;
  position: relative;
  cursor: grab;
}

#graph-scroll.panning {
  cursor: grabbing;
  user-select: none;
}

#graph-container {
  position: relative;
  margin: 0 auto;
  transform-origin: 0 0;
}

/* Flytende verktøylinje for zoom - eneste innhold igjen i bottom-toolbar
   etter at "vis alle læringsmål" og prøvegeneratoren flyttet inn i
   #action-menu-panel (se ensureActionMenu i engine.js). Disse knappene
   brukes aktivt mens man utforsker kartet, så de forblir synlige i stedet
   for gjemt bak et trekkspill. */
#bottom-toolbar {
  position: fixed;
  left: 1.6rem;
  bottom: 1.6rem;
  z-index: 15;
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

#zoom-controls {
  display: flex;
  align-items: stretch;
  gap: 0.5rem;
}

/* Ikon-only knapper (+/−/⤢), ingen tekst - holder knappene små også på
   mobil, se prosjektnotat om at knappene var for store der. */
#zoom-in-btn, #zoom-out-btn, #fit-view-btn {
  width: 2.6rem;
  height: 2.6rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.35);
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

#zoom-in-btn:hover, #zoom-out-btn:hover, #fit-view-btn:hover {
  border-color: var(--border-strong);
  background: var(--surface-hover);
  transform: translateY(-1px);
}

/* Prøvegenerator-widget - nå inne i #action-menu-panel, se der for
   panel-spesifikk styling av knappen selv. */
#exam-widget {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  font-size: 0.82rem;
}

#exam-count-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-muted);
  white-space: nowrap;
}

#exam-count {
  width: 3.2rem;
  font-size: 0.82rem;
  padding: 0.3rem 0.4rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
}

#action-menu-panel #exam-btn {
  flex: 1 1 auto;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  padding: 0.55rem 0.9rem;
  border-radius: var(--radius-pill);
  border: none;
  background: var(--accent-grad);
  color: #14100A;
  cursor: pointer;
  white-space: normal;
  transition: transform 0.15s ease, opacity 0.15s ease;
}

#action-menu-panel #exam-btn:hover {
  transform: translateY(-1px);
  opacity: 0.92;
}

@media (max-width: 720px) {
  #bottom-toolbar { left: 1rem; bottom: 1rem; }
}

/* "Vis alle læringsmål"-vindu */

#goal-index-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 40;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: rgba(0, 0, 0, 0.6);
}

#goal-index-overlay.open { display: flex; }

#goal-index-modal {
  width: 100%;
  max-width: 760px;
  max-height: 86vh;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}

#goal-index-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.4rem 1.6rem 1rem;
  border-bottom: 1px solid var(--border);
}

#goal-index-header h2 {
  font-size: 1.3rem;
  font-weight: 700;
}

#goal-index-actions {
  display: flex;
  gap: 0.6rem;
  flex-shrink: 0;
}

#goal-index-body {
  overflow-y: auto;
  padding: 1.2rem 1.6rem 1.8rem;
}

.goal-index-section { margin-bottom: 1.4rem; }
.goal-index-section:last-child { margin-bottom: 0; }

.goal-index-section h3 {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--border);
}

.goal-index-section ul {
  list-style: none;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text-muted);
}

@media (max-width: 720px) {
  #goal-index-overlay { padding: 0; }
  #goal-index-modal { max-width: 100%; height: 100%; max-height: 100%; border-radius: 0; }
}

/* «Hvordan bruker jeg denne siden?»-vindu */

#help-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 40;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: rgba(0, 0, 0, 0.6);
}

#help-overlay.open { display: flex; }

#help-modal {
  width: 100%;
  max-width: 620px;
  max-height: 86vh;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}

#help-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.4rem 1.6rem 1rem;
  border-bottom: 1px solid var(--border);
}

#help-header h2 {
  font-size: 1.3rem;
  font-weight: 700;
}

#help-body {
  overflow-y: auto;
  padding: 1.2rem 1.6rem 1.8rem;
}

#help-body h3 {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.4rem;
}

#help-body h3:not(:first-child) {
  margin-top: 1.2rem;
}

#help-body p {
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--text-muted);
}

@media (max-width: 720px) {
  #help-overlay { padding: 0; }
  #help-modal { max-width: 100%; height: 100%; max-height: 100%; border-radius: 0; }
}

#edges {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  pointer-events: none;
}

#edges path {
  fill: none;
  stroke: var(--border-strong);
  stroke-width: 1.6;
}

#edges path.edge-active {
  stroke: var(--accent);
  stroke-width: 1.8;
  opacity: 0.7;
}

.column-band {
  position: absolute;
  background: transparent;
  pointer-events: none;
}

.column-band-alt {
  background: var(--column-alt);
}

.column-header {
  position: absolute;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.4rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.column-header-label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.column-header-actions {
  display: flex;
  gap: 0.25rem;
  flex-shrink: 0;
}

.column-header-btn {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: none;
  line-height: 1;
  padding: 0.2rem 0.35rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.column-header-btn:hover {
  border-color: var(--border-strong);
  background: var(--surface-hover);
  color: var(--text);
}

#nodes-layer {
  position: relative;
  z-index: 2;
}

.node-box {
  position: absolute;
  padding: 0.7rem 0.85rem 0.6rem;
  background: var(--begrep-bg);
  border: 1.5px solid var(--begrep-border);
  border-radius: 14px;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.2s ease, border-color 0.15s ease;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  user-select: none;
}

.node-box:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
}

.node-box.type-ferdighet {
  border-radius: 8px;
  background: var(--ferdighet-bg);
  border-color: var(--ferdighet-border);
}

.node-box.locked {
  opacity: var(--locked-opacity);
}

.node-box.mastered {
  box-shadow: 0 0 0 2px var(--success) inset;
}

.node-box.active {
  box-shadow: 0 0 0 2px var(--text) inset;
}

.node-box.highlight-pulse {
  animation: prereq-pulse 1.6s ease-out;
}

@keyframes prereq-pulse {
  0% { box-shadow: 0 0 0 0 var(--accent); }
  40% { box-shadow: 0 0 0 8px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

.node-top-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.4rem;
}

.node-name {
  flex: 1;
  min-width: 0;
  font-size: 0.86rem;
  font-weight: 600;
  line-height: 1.25;
  color: var(--text);
}

.node-index {
  font-weight: 500;
  color: var(--text-muted);
}

.node-checkbox {
  flex-shrink: 0;
  width: 17px;
  height: 17px;
  accent-color: var(--success);
  cursor: pointer;
}

.node-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.4rem;
}

.node-meta-left {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.badge {
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  border: none;
}

.badge-del1 { background: var(--del1); color: #fff; }
.badge-del2 { background: var(--del2); color: #fff; }
.badge-begge { background: linear-gradient(90deg, var(--del1) 50%, var(--del2) 50%); color: #fff; }

.badge-type {
  font-size: 0.68rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

/* Detail panel */

#detail-panel {
  width: 0;
  overflow: hidden;
  background: var(--surface);
  border-left: 1px solid var(--border);
  transition: width 0.22s ease;
  flex-shrink: 0;
}

#detail-panel.open {
  width: min(440px, 92vw);
}

#detail-panel-inner {
  width: min(440px, 92vw);
  height: 100%;
  overflow-y: auto;
  padding: 1.6rem 1.6rem 3rem;
}

#detail-close {
  float: right;
  background: none;
  border: none;
  font-size: 0.9rem;
  color: var(--text-muted);
  cursor: pointer;
}
#detail-close:hover, #detail-close:focus-visible { color: var(--text); }

#detail-panel h2 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  clear: both;
  padding-top: 0.1rem;
}

#detail-meta {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

#detail-status {
  margin-bottom: 1rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

#detail-status.available { color: var(--accent); }

.mastery-toggles {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.2rem;
}

.mastered-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text);
  cursor: pointer;
}

#detail-desc {
  line-height: 1.7;
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 1.4rem;
}

.prereq-list {
  margin: 0 0 1.4rem 0;
  padding: 0;
  list-style: none;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text-muted);
}

.prereq-item {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.prereq-check {
  flex: 0 0 auto;
  width: 1em;
  text-align: center;
  color: var(--text-muted);
  opacity: 0.6;
}

.prereq-item-done .prereq-check {
  color: var(--success);
  opacity: 1;
}

.prereq-link {
  font: inherit;
  color: var(--accent);
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  text-decoration: underline;
  text-decoration-color: transparent;
  transition: text-decoration-color 0.15s;
}

.prereq-link:hover,
.prereq-link:focus-visible {
  text-decoration-color: currentColor;
}

.instruction-actions {
  display: flex;
  gap: 0.6rem;
  margin-bottom: 0.8rem;
}

.btn {
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.5rem 0.95rem;
  border-radius: var(--radius-pill);
  border: none;
  background: var(--accent-grad);
  color: #14100A;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.15s ease;
}

.btn.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn:hover { transform: translateY(-1px); opacity: 0.92; }
.btn.secondary:hover { border-color: var(--border-strong); background: var(--surface-hover); transform: none; opacity: 1; }

#instruction-text {
  display: none;
  width: 100%;
  min-height: 220px;
  font-family: ui-monospace, 'SFMono-Regular', Consolas, monospace;
  font-size: 0.78rem;
  line-height: 1.55;
  padding: 0.8rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  resize: vertical;
  margin-bottom: 1.4rem;
}

#instruction-text.visible { display: block; }

.exam-list {
  list-style: none;
  font-size: 0.86rem;
}

.exam-list li {
  padding: 0.5rem 0;
  border-top: 1px solid var(--border);
}

.exam-list li:first-child { border-top: none; }

.exam-list a { text-decoration: none; }
.exam-list a:hover, .exam-list a:focus-visible { text-decoration: underline; }

#detail-empty {
  color: var(--text-muted);
  font-style: italic;
  padding: 2rem 0;
}

/* Legend */

/* Kortene selv skriver nå ut "Del 1"/"Del 2"/"Del 1+2" i sin egen badge
   (se makeHjelpemiddelBadge i engine.js) i stedet for forkortelsen "D1" -
   en egen forklarende legend er derfor overflødig. #legend-elementet står
   igjen tomt i hvert fags index.html; skjul det helt så det ikke tar opp
   plass. */
#legend {
  display: none;
}

@media (max-width: 720px) {
  #detail-panel.open { width: 100vw; position: fixed; inset: 0; z-index: 20; }
  #detail-panel-inner { width: 100vw; }
}