/* ==========================================================================
   VoltSchaltplan – ElektroGenius Design-System
   Farben: Flächen #ffffff / #f8fafc, Rot #d62828, Blau #1d4ed8, Grün #15803d, Text #0f172a
   Touch-optimiert (mindestens 44px Klickflächen), responsive, barrierefrei
   ========================================================================== */

:root {
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --text-main: #0f172a;
  --text-muted: #475569;
  --border-light: #e2e8f0;
  --border-focus: #1d4ed8;
  --red-eg: #d62828;
  --red-hover: #b91c1c;
  --blue-doc: #1d4ed8;
  --blue-hover: #1e40af;
  --green-ok: #15803d;
  --green-hover: #166534;
  --amber-warn: #b45309;
  --line-phase: #dc2626;
  --line-neutral: #2563eb;
  --line-pe: #15803d;
  --line-off: #94a3b8;
  --glow-phase: rgba(220, 38, 38, 0.45);
  --glow-light: rgba(245, 158, 11, 0.7);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 10px 25px rgba(15, 23, 42, 0.12);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.app-header {
  background-color: var(--bg-card);
  border-bottom: 2px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.brand-badge {
  background-color: var(--red-eg);
  color: #ffffff;
  font-weight: 800;
  font-size: 0.9rem;
  letter-spacing: 0.5px;
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  box-shadow: 0 2px 6px rgba(214, 40, 40, 0.35);
}

.brand-titles h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.2;
}

.brand-titles p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.header-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--green-ok);
  font-weight: 600;
  background: #f0fdf4;
  padding: 0.4rem 0.75rem;
  border-radius: 9999px;
  border: 1px solid #bbf7d0;
}

.header-status::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--green-ok);
}

/* Tab Navigation */
.nav-tabs {
  background-color: #ffffff;
  border-bottom: 1px solid var(--border-light);
}

.nav-tabs-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
}

.tab-btn {
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  padding: 0.9rem 1.2rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 48px;
  transition: all 0.15s ease-in-out;
}

.tab-btn:hover {
  color: var(--text-main);
  background-color: #f1f5f9;
}

.tab-btn.active {
  color: var(--red-eg);
  border-bottom-color: var(--red-eg);
  background-color: #fff;
}

.tab-badge {
  background: #e2e8f0;
  color: #334155;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.15rem 0.45rem;
  border-radius: 9999px;
}

.tab-btn.active .tab-badge {
  background: var(--red-eg);
  color: #ffffff;
}

/* Hauptbereich */
.container {
  max-width: 1280px;
  margin: 1.5rem auto;
  padding: 0 1.25rem;
  width: 100%;
  flex: 1;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* Karten & Boxen */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
  overflow: hidden;
}

.card-header {
  padding: 1.1rem 1.4rem;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  background-color: #ffffff;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card-body {
  padding: 1.4rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.15rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  min-height: 44px;
  min-width: 44px;
  text-decoration: none;
  transition: all 0.15s ease-in-out;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background-color: var(--red-eg);
  color: #ffffff;
  border-color: var(--red-eg);
}

.btn-primary:hover {
  background-color: var(--red-hover);
  border-color: var(--red-hover);
}

.btn-secondary {
  background-color: var(--blue-doc);
  color: #ffffff;
  border-color: var(--blue-doc);
}

.btn-secondary:hover {
  background-color: var(--blue-hover);
  border-color: var(--blue-hover);
}

.btn-success {
  background-color: var(--green-ok);
  color: #ffffff;
  border-color: var(--green-ok);
}

.btn-success:hover {
  background-color: var(--green-hover);
  border-color: var(--green-hover);
}

.btn-outline {
  background-color: #ffffff;
  color: var(--text-main);
  border-color: #cbd5e1;
}

.btn-outline:hover {
  background-color: #f1f5f9;
  border-color: #94a3b8;
}

.btn-sm {
  min-height: 38px;
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
}

/* Pillen-Auswahl / Schalter-Leiste */
.circuit-selector {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  margin-bottom: 1.25rem;
}

.circuit-btn {
  background-color: #f1f5f9;
  border: 1px solid var(--border-light);
  color: var(--text-muted);
  border-radius: var(--radius-md);
  padding: 0.6rem 1rem;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  min-height: 44px;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  transition: all 0.15s ease-in-out;
}

.circuit-btn:hover {
  background-color: #e2e8f0;
  color: var(--text-main);
}

.circuit-btn.active {
  background-color: var(--blue-doc);
  color: #ffffff;
  border-color: var(--blue-doc);
  box-shadow: 0 2px 6px rgba(29, 78, 216, 0.3);
}

/* Simulator Workspace */
.sim-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 1.5rem;
}

@media (max-width: 980px) {
  .sim-grid {
    grid-template-columns: 1fr;
  }
}

.schematic-box {
  background-color: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1rem;
  position: relative;
  overflow: hidden;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.02);
}

.schematic-svg-container {
  width: 100%;
  overflow-x: auto;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 480px;
  background: radial-gradient(circle, #f8fafc 10%, #f1f5f9 90%);
  border-radius: var(--radius-sm);
  border: 1px dashed #cbd5e1;
}

.schematic-svg {
  width: 100%;
  max-width: 860px;
  height: auto;
  min-height: 460px;
  user-select: none;
}

/* SVG Schaltungselemente */
.svg-wire {
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: stroke 0.25s ease, stroke-width 0.25s ease, filter 0.25s ease;
}

.svg-wire.live-230v {
  stroke: var(--line-phase) !important;
  stroke-width: 3.2 !important;
  filter: drop-shadow(0 0 3px var(--glow-phase));
}

.svg-wire.neutral {
  stroke: var(--line-neutral) !important;
  stroke-width: 2.5;
}

.svg-wire.pe {
  stroke: var(--line-pe) !important;
  stroke-width: 2;
  stroke-dasharray: 6, 4;
}

.svg-wire.dead {
  stroke: var(--line-off) !important;
  stroke-width: 2.2;
}

.svg-switch-clickable {
  cursor: pointer;
  pointer-events: all;
}

.svg-switch-clickable:hover .switch-arm {
  stroke: #b91c1c;
  stroke-width: 3.5;
}

.svg-lamp-active circle.lamp-glass {
  fill: #fef08a !important;
  stroke: #ca8a04 !important;
  filter: drop-shadow(0 0 10px var(--glow-light));
}

.svg-lamp-active line.lamp-cross {
  stroke: #854d0e !important;
}

.svg-coil-active rect {
  fill: #fef3c7 !important;
  stroke: #b45309 !important;
  stroke-width: 2.5 !important;
}

/* Interaktions-Hinweise */
.click-hint {
  font-size: 0.8rem;
  color: var(--blue-doc);
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  margin-top: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Simulator Sidebar Controls */
.sim-controls {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.info-card {
  background-color: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.info-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.info-card p, .info-card li {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.info-card ul {
  padding-left: 1.25rem;
  margin-top: 0.4rem;
}

.voltage-legend {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-top: 0.6rem;
  font-size: 0.82rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.legend-color {
  width: 24px;
  height: 6px;
  border-radius: 3px;
}

.legend-color.phase {
  background-color: var(--line-phase);
  box-shadow: 0 0 4px var(--glow-phase);
}

.legend-color.neutral {
  background-color: var(--line-neutral);
}

.legend-color.pe {
  background-color: var(--line-pe);
  border: 1px dashed #ffffff;
}

.legend-color.dead {
  background-color: var(--line-off);
}

.status-badge {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
}

.status-badge.on {
  background-color: #dcfce7;
  color: var(--green-ok);
  border: 1px solid #86efac;
}

.status-badge.off {
  background-color: #f1f5f9;
  color: #64748b;
  border: 1px solid #cbd5e1;
}

/* Quiz Styles */
.quiz-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  background-color: #f8fafc;
  padding: 1rem 1.4rem;
  border-bottom: 1px solid var(--border-light);
}

.quiz-progress-wrap {
  flex: 1;
  min-width: 220px;
}

.progress-track {
  width: 100%;
  height: 10px;
  background-color: #e2e8f0;
  border-radius: 9999px;
  overflow: hidden;
  margin-top: 0.35rem;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--red-eg), #ea580c);
  width: 0%;
  transition: width 0.3s ease;
}

.quiz-score-pill {
  font-size: 0.95rem;
  font-weight: 700;
  background-color: #ffffff;
  border: 1px solid #cbd5e1;
  padding: 0.4rem 0.9rem;
  border-radius: 9999px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.quiz-filters {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.filter-btn {
  background-color: #ffffff;
  border: 1px solid var(--border-light);
  color: var(--text-muted);
  border-radius: 9999px;
  padding: 0.35rem 0.9rem;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  min-height: 40px;
  transition: all 0.15s ease;
}

.filter-btn.active {
  background-color: var(--red-eg);
  color: #ffffff;
  border-color: var(--red-eg);
}

.question-card {
  background-color: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.4rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s ease;
}

.question-card.answered-correct {
  border-color: #86efac;
  background: #f0fdf4;
}

.question-card.answered-wrong {
  border-color: #fca5a5;
  background: #fef2f2;
}

.question-num {
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--red-eg);
  margin-bottom: 0.35rem;
}

.question-text {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.question-svg-illustration {
  margin: 1rem 0;
  padding: 0.75rem;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-sm);
  display: flex;
  justify-content: center;
}

.options-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.option-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border: 1.5px solid var(--border-light);
  border-radius: var(--radius-md);
  background-color: #ffffff;
  cursor: pointer;
  min-height: 48px;
  font-size: 0.92rem;
  color: var(--text-main);
  transition: all 0.15s ease-in-out;
}

.option-item:hover {
  background-color: #f8fafc;
  border-color: #94a3b8;
}

.option-item.selected {
  border-color: var(--blue-doc);
  background-color: #eff6ff;
}

.option-item.correct {
  border-color: var(--green-ok) !important;
  background-color: #ecfdf5 !important;
  color: #064e3b !important;
  font-weight: 600;
}

.option-item.incorrect {
  border-color: var(--red-eg) !important;
  background-color: #fff1f2 !important;
  color: #881337 !important;
}

.option-radio {
  margin-top: 0.2rem;
  accent-color: var(--red-eg);
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.feedback-box {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  display: none;
}

.feedback-box.show {
  display: block;
}

.feedback-box.correct {
  background-color: #dcfce7;
  border: 1px solid #86efac;
  color: #14532d;
}

.feedback-box.incorrect {
  background-color: #fee2e2;
  border: 1px solid #fca5a5;
  color: #7f1d1d;
}

.feedback-norm {
  font-weight: 700;
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* Fehlersuche & Prüfspitzen-Tool */
.trouble-grid {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 1.5rem;
}

@media (max-width: 980px) {
  .trouble-grid {
    grid-template-columns: 1fr;
  }
}

.meter-panel {
  background: linear-gradient(145deg, #1e293b, #0f172a);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  color: #ffffff;
  box-shadow: var(--shadow-md);
  border: 2px solid #334155;
}

.meter-title {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: #94a3b8;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  display: flex;
  justify-content: space-between;
}

.meter-display {
  background-color: #020617;
  border: 2px solid #38bdf8;
  border-radius: var(--radius-md);
  padding: 1rem;
  text-align: center;
  margin-bottom: 1rem;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.8);
}

.meter-val {
  font-family: 'Courier New', Courier, monospace;
  font-size: 2.2rem;
  font-weight: 900;
  color: #38bdf8;
  letter-spacing: 1px;
}

.meter-unit {
  font-size: 1rem;
  color: #7dd3fc;
  margin-left: 0.25rem;
}

.meter-sub {
  font-size: 0.78rem;
  color: #94a3b8;
  margin-top: 0.25rem;
}

.probe-selector-group {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.probe-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  min-height: 44px;
  border: 2px solid transparent;
  transition: all 0.15s ease;
}

.probe-btn.probe-l1 {
  background-color: #450a0a;
  color: #fca5a5;
  border-color: #b91c1c;
}

.probe-btn.probe-l1.active {
  background-color: #b91c1c;
  color: #ffffff;
  box-shadow: 0 0 10px rgba(220, 38, 38, 0.6);
}

.probe-btn.probe-l2 {
  background-color: #172554;
  color: #93c5fd;
  border-color: #1d4ed8;
}

.probe-btn.probe-l2.active {
  background-color: #1d4ed8;
  color: #ffffff;
  box-shadow: 0 0 10px rgba(29, 78, 216, 0.6);
}

.probe-indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: inline-block;
}

.probe-btn.probe-l1 .probe-indicator {
  background-color: #ef4444;
}

.probe-btn.probe-l2 .probe-indicator {
  background-color: #3b82f6;
}

.probe-status-text {
  font-size: 0.8rem;
  color: #cbd5e1;
  background: #334155;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}

/* Messpunkte auf SVG */
.test-point {
  cursor: pointer;
  transition: transform 0.2s ease;
}

.test-point:hover {
  transform: scale(1.25);
}

.test-point circle {
  fill: #ffffff;
  stroke: #0f172a;
  stroke-width: 2;
}

.test-point.probe-on-l1 circle {
  fill: #ef4444 !important;
  stroke: #b91c1c !important;
  stroke-width: 3 !important;
}

.test-point.probe-on-l2 circle {
  fill: #3b82f6 !important;
  stroke: #1d4ed8 !important;
  stroke-width: 3 !important;
}

/* PDF Export Box */
.export-card {
  background: linear-gradient(135deg, #ffffff 0%, #f1f5f9 100%);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.export-details h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.export-details p {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.form-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 0.75rem;
}

.form-input {
  min-height: 44px;
  padding: 0.5rem 0.85rem;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  color: var(--text-main);
  background-color: #ffffff;
  flex: 1;
  min-width: 200px;
}

.form-input:focus {
  outline: none;
  border-color: var(--blue-doc);
  box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.15);
}

/* Footer */
.app-footer {
  background-color: #ffffff;
  border-top: 1px solid var(--border-light);
  padding: 1.25rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: auto;
}

.app-footer strong {
  color: var(--text-main);
}