/* Gemeinsames Stylesheet für die Schritt-für-Schritt-Erklärungsseiten
   (auswahl/erklaerungen/*.html). Farben/Typo stammen aus style.css (:root).
   Namespace: .erl  ·  kompakte Variante: zusätzlich .erl-compact am Container. */

/* Kein zweiter „Karten“-Rahmen/Rundung: sonst Doppelkante zu .main (Desktop). */
.rechenweg.erl {
  border: none;
  box-shadow: none;
  border-radius: 0;
  background-color: transparent;
}

.erl {
  --erl-mono: ui-monospace, "Cascadia Code", "Segoe UI Mono", monospace;
  --erl-calc-bg: var(--color-nav-bg);
  --erl-calc-ink: #eef3f1;
  --erl-calc-soft: rgba(255, 255, 255, 0.58);
  --erl-calc-line: rgba(255, 255, 255, 0.14);
  --erl-calc-hi: #9fd9cf;
  --erl-step-idle: #8fa09c;
  --erl-step-done: #3d9e8f;
  max-width: 960px;
  margin-left: auto;
  margin-right: auto;
  padding-bottom: 8px;
}

.erl__back {
  margin: 0 0 12px;
  font-size: 0.9375rem;
}

.erl__back a {
  font-weight: 600;
}

.erl .page-title {
  margin-top: 12px;
  margin-bottom: 18px;
}

.erl__subtitle {
  text-align: center;
  margin: 0 0 18px;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.erl__badge {
  display: inline-block;
  font-family: var(--erl-mono);
  font-size: 0.72em;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: var(--color-accent-soft);
  color: var(--color-accent-hover);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  margin-right: 6px;
  vertical-align: middle;
}

.erl .situation {
  background: var(--color-surface-muted);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  margin-bottom: 18px;
  box-shadow: none;
}

.erl .situation-label {
  font-family: var(--erl-mono);
  font-size: 0.68rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--color-accent-hover);
  margin-bottom: 6px;
  font-weight: 600;
}

.erl .situation p {
  font-size: 0.94rem;
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.6;
}

.erl .situation strong {
  color: var(--color-text);
  font-style: normal;
}

.erl .situation-section + .situation-section {
  margin-top: 12px;
}

.erl .situation .prx-tab-datum,
.erl .situation .prx-tab-datum th,
.erl .situation .prx-tab-datum td {
  font-size: 0.94rem !important;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.erl .nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 14px;
}

.erl button.btn {
  margin-top: 0;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: none;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    opacity 0.15s;
}

.erl button.btn:not(.btn-primary) {
  background: var(--color-surface);
  color: var(--color-text);
  border: 2px solid var(--color-border-strong);
}

.erl button.btn:not(.btn-primary):hover:not(:disabled) {
  background: var(--color-surface-muted);
  border-color: var(--color-accent);
  color: var(--color-accent-hover);
  transform: none;
}

.erl button.btn-primary {
  background-color: var(--color-accent);
  border: 2px solid var(--color-accent);
  color: #fff;
}

.erl button.btn-primary:hover:not(:disabled) {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  transform: none;
}

.erl button.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.erl .btn-reset {
  margin-left: auto;
}

.erl .main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  align-items: start;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  /* Freie Fläche unter der Rechenspalte = Seitenhintergrund, nicht dunkel/grau */
  background-color: var(--color-bg);
  background-clip: padding-box;
}

.erl .main.main--full {
  grid-template-columns: 1fr;
}

.erl .main.main--full .steps {
  border-right: none;
}

.erl .steps {
  background: var(--color-surface-muted);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  border-radius: 0;
  overflow: hidden;
  min-height: 0;
  align-self: stretch;
}

.erl .step {
  border-bottom: 1px solid var(--color-border);
}

.erl .step:last-child {
  border-bottom: none;
}

.erl .step.active {
  background: var(--color-surface);
}

.erl .step-head {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 13px 16px;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.erl .step-head:hover {
  background: var(--color-accent-soft);
}

.erl .step-head:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}

.erl .step-num {
  font-family: var(--erl-mono);
  font-size: 0.68rem;
  font-weight: 600;
  color: #fff;
  background: var(--erl-step-idle);
  width: 23px;
  height: 23px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 3px;
  transition: background 0.2s;
}

.erl .step.active .step-num {
  background: var(--color-accent);
}

.erl .step.done .step-num {
  background: var(--erl-step-done);
}

.erl .step-title-wrap {
  flex: 1;
  min-width: 0;
}

.erl .step-title {
  font-weight: 650;
  font-size: 0.98rem;
  line-height: 1.3;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.erl .step-sub {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  font-family: var(--erl-mono);
  margin-top: 2px;
}

.erl .step-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

.erl .step.active .step-body,
.erl .step.done .step-body {
  grid-template-rows: 1fr;
}

.erl .step-body-inner {
  overflow: hidden;
}

.erl .step-explain {
  padding: 10px 16px 14px 51px;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
  line-height: 1.58;
}

.erl .step-explain p {
  margin-bottom: 5px;
}

.erl .step-explain p:last-child {
  margin-bottom: 0;
}

.erl .step-explain ul {
  margin: 0.35em 0 0;
  padding-left: 1.2em;
  list-style-position: outside;
}

.erl .step-explain ul li {
  margin-bottom: 3px;
}

.erl .step-explain .rule {
  font-family: var(--erl-mono);
  font-size: 0.8rem;
  background: var(--color-accent-soft);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  display: inline-block;
  margin-top: 6px;
}

/* Fußnote unter den Schritten (nur auf Seiten mit <details class="steps-footnote">) */
.rechenweg.erl .steps-footnote {
  margin-top: auto;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-muted);
}

.rechenweg.erl .steps-footnote > summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 13px 16px;
  cursor: pointer;
  user-select: none;
  list-style: none;
  -webkit-tap-highlight-color: transparent;
  transition: background-color var(--transition-fast);
}

.rechenweg.erl .steps-footnote-num {
  font-family: var(--erl-mono);
  font-size: 0.68rem;
  font-weight: 600;
  color: #fff;
  background: var(--erl-step-idle);
  width: 23px;
  height: 23px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 3px;
  line-height: 1;
}

.rechenweg.erl .steps-footnote > summary::-webkit-details-marker {
  display: none;
}

.rechenweg.erl .steps-footnote > summary::marker {
  content: "";
}

.rechenweg.erl .steps-footnote > summary:hover {
  background: var(--color-accent-soft);
}

.rechenweg.erl .steps-footnote[open] > summary {
  padding-bottom: 8px;
}

/* linker Einzug wie .step-explain (Badge + Abstand bei nummerierten Schritten) */
.rechenweg.erl .steps-footnote-body {
  padding: 10px 16px 14px 51px;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.rechenweg.erl .steps-footnote-body p {
  margin: 0;
}

.rechenweg.erl .steps-footnote-intro {
  margin: 0;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.58;
}

.rechenweg.erl .steps-footnote-intro-rule {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 10px 0 14px;
  padding: 0;
  height: 0;
}

.erl .calc {
  background: var(--erl-calc-bg);
  color: var(--erl-calc-ink);
  font-family: var(--erl-mono);
  display: flex;
  flex-direction: column;
  min-height: 0;
  align-self: start;
  height: fit-content;
  border-radius: 0;
  overflow: hidden;
}

.erl .calc-header {
  padding: 13px 20px 11px;
  border-bottom: 1px solid var(--erl-calc-line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.erl .calc-header-title {
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--erl-calc-soft);
}

.erl .calc-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: erl-pulse 2s ease-in-out infinite;
}

@keyframes erl-pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.35;
  }
}

.erl .calc-rows {
  flex: 0 0 auto;
  padding: 6px 0 10px;
}

.erl .calc-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px 14px;
  align-items: baseline;
  padding: 7px 20px;
  opacity: 0;
  transform: translateX(10px);
  transition:
    opacity 0.3s,
    transform 0.3s;
}

.erl .calc-row.visible {
  opacity: 1;
  transform: translateX(0);
}

.erl .calc-row-num {
  display: inline-block;
  min-width: 1em;
  margin-right: 0.4em;
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--erl-calc-soft);
  text-align: center;
  vertical-align: baseline;
}

.erl .calc-row-label {
  font-size: 0.78rem;
  color: var(--erl-calc-soft);
  line-height: 1.45;
  min-width: 0;
}

.erl .calc-row-label em {
  display: block;
  font-style: normal;
  font-size: 0.85rem;
  color: rgba(159, 217, 207, 0.65);
  margin-top: 2px;
}

.erl .calc-row-val {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--erl-calc-ink);
  text-align: right;
  white-space: nowrap;
}

.erl .calc-row.subtotal {
  border-top: 1px solid var(--erl-calc-line);
  padding-top: 9px;
  margin-top: 2px;
  background: rgba(255, 255, 255, 0.04);
}

.erl .calc-row.subtotal .calc-row-label {
  color: var(--erl-calc-ink);
  font-size: 0.82rem;
}

.erl .calc-row.subtotal .calc-row-val {
  color: var(--erl-calc-hi);
}

.erl .calc-total {
  background: var(--color-accent);
  padding: 14px 20px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: center;
  opacity: 0;
  transition: opacity 0.5s 0.15s;
  margin-top: 0;
  flex: 0 0 auto;
}

.erl .calc-total.visible {
  opacity: 1;
}

.erl .calc-total-label {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.4;
  font-family: var(--font-sans);
}

.erl .calc-total-label strong {
  display: block;
  color: #fff;
  font-size: 1.02em;
  font-weight: 650;
}

.erl .calc-total-val {
  font-size: 1.12rem;
  font-weight: 600;
  color: #fff;
  white-space: nowrap;
}

/* Kompakte Variante (dichtere Zeilenabstände in der Rechenspalte) */
.erl-compact .calc-header {
  padding: 8px 14px 6px;
}

.erl-compact .calc-rows {
  padding: 3px 0 5px;
}

.erl-compact .calc-row {
  gap: 5px 10px;
  padding: 3px 14px;
}

.erl-compact .calc-row.subtotal {
  padding-top: 5px;
  margin-top: 1px;
}

.erl-compact .calc-row-num {
  font-size: 0.62rem;
}

.erl-compact .calc-row-label {
  font-size: 0.73rem;
  line-height: 1.3;
}

.erl-compact .calc-row-label em {
  margin-top: 1px;
  font-size: 0.78rem;
}

.erl-compact .calc-row-val {
  font-size: 0.8rem;
}

.erl-compact .calc-total {
  padding: 10px 14px;
  gap: 8px;
}

.erl-compact .calc-total-label {
  font-size: 0.74rem;
  line-height: 1.28;
}

.erl-compact .calc-total-val {
  font-size: 1.02rem;
}

@media (max-width: 680px) {
  .erl .main {
    grid-template-columns: 1fr;
  }

  .erl .steps {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
  }

  .erl .calc {
    border-top: 2px solid var(--erl-calc-line);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
  }

  .erl .btn-reset {
    margin-left: 0;
    width: 100%;
  }

  .erl .nav {
    flex-direction: column;
    align-items: stretch;
  }

  .erl .nav .btn:not(.btn-reset) {
    width: 100%;
  }
}