/* ==========================================================================
   Waermepumpen-Rechner – Styles (Mobile-First)
   ========================================================================== */

:root {
  --color-primary: #1a6b3c;
  --color-primary-light: #e8f5ee;
  --color-primary-dark: #0f4425;
  --color-accent: #f59e0b;
  --color-danger: #dc3545;
  --color-danger-light: #fde8ea;
  --color-text: #1f2937;
  --color-text-muted: #6b7280;
  --color-border: #d1d5db;
  --color-bg: #ffffff;
  --color-bg-subtle: #f3f4f6;
  --color-bg-card: #ffffff;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --transition: 0.2s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-text);
  background: var(--color-bg-subtle);
  -webkit-font-smoothing: antialiased;
}

/* Layout */
.calculator-wrapper {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px;
}

/* Header */
.calc-header {
  text-align: center;
  margin-bottom: 24px;
}

.calc-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
}

.calc-header .subtitle {
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

/* Modus-Tabs */
.mode-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 16px;
}

.tab-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 12px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

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

.tab-btn.active {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.tab-icon {
  font-size: 0.75rem;
}

/* Szenario-Beschreibung */
.scenario-desc {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 20px;
  font-style: italic;
  min-height: 1.3em;
}

/* Formular */
fieldset {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 16px;
  margin-bottom: 16px;
  background: var(--color-bg);
}

legend {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  padding: 0 8px;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="email"],
.form-group select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26, 107, 60, 0.1);
}

.form-group input.invalid {
  border-color: var(--color-danger);
}

.hint {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* Toggle-Buttons */
.toggle-wrapper {
  display: flex;
  gap: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.toggle-btn {
  flex: 1;
  padding: 8px 16px;
  border: none;
  background: var(--color-bg);
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

.toggle-btn + .toggle-btn {
  border-left: 1px solid var(--color-border);
}

.toggle-btn.active {
  background: var(--color-primary);
  color: #fff;
}

.toggle-btn:hover:not(.active) {
  background: var(--color-bg-subtle);
}

/* Slider + Number */
.slider-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.slider-group input[type="range"] {
  flex: 1;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--color-border);
  border-radius: 3px;
  outline: none;
}

.slider-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  border: 2px solid #fff;
  box-shadow: var(--shadow-sm);
}

.slider-group input[type="number"] {
  width: 70px;
  text-align: center;
}

/* Bedingte Felder */
.conditional-pv,
.conditional-foerderung {
  overflow: hidden;
  max-height: 200px;
  opacity: 1;
  transition: max-height 0.3s ease, opacity 0.3s ease, margin 0.3s ease;
}

.conditional-pv.hidden,
.conditional-foerderung.hidden {
  max-height: 0;
  opacity: 0;
  margin: 0;
  padding: 0;
}

/* Berechnen-Button */
.btn-calculate {
  display: block;
  width: 100%;
  padding: 14px 24px;
  border: none;
  border-radius: var(--radius);
  background: var(--color-primary);
  color: #fff;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background var(--transition);
  margin-top: 8px;
}

.btn-calculate:hover {
  background: var(--color-primary-dark);
}

.btn-calculate:active {
  transform: scale(0.99);
}

/* ==========================================================================
   Ergebnisse
   ========================================================================== */

.results-section {
  margin-top: 32px;
}

.results-section.hidden {
  display: none;
}

.results-section h2 {
  text-align: center;
  font-size: 1.3rem;
  color: var(--color-primary-dark);
  margin-bottom: 20px;
}

/* Kennzahlen-Karten */
.result-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-bottom: 24px;
}

.result-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 16px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.result-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.result-card.highlight {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.card-value {
  display: block;
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-primary-dark);
  margin-bottom: 4px;
}

.result-card.highlight .card-value {
  font-size: 1.8rem;
}

.result-card.negative {
  border-color: var(--color-danger);
  background: var(--color-danger-light);
}

.result-card.negative .card-value {
  color: var(--color-danger);
}

.card-label {
  display: block;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* Info-Box */
.info-box {
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.info-box:empty {
  display: none;
}

/* ==========================================================================
   E-Mail-Gate
   ========================================================================== */

.email-gate {
  background: linear-gradient(135deg, var(--color-primary-light), #fff);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
  margin-bottom: 24px;
}

.email-gate.hidden {
  display: none;
}

.gate-teaser h3 {
  font-size: 1.1rem;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
}

.gate-teaser p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.gate-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 400px;
  margin: 0 auto;
}

.gate-form input[type="email"] {
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 1rem;
  text-align: center;
}

.gate-form input[type="email"]:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26, 107, 60, 0.1);
}

.btn-unlock {
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius);
  background: var(--color-primary);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background var(--transition);
}

.btn-unlock:hover {
  background: var(--color-primary-dark);
}

.btn-unlock:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.gate-error {
  color: var(--color-danger);
  font-size: 0.85rem;
}

.gate-error.hidden {
  display: none;
}

.gate-privacy {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* ==========================================================================
   Stage 2 (gelockt / freigeschaltet)
   ========================================================================== */

#stage2-results.locked {
  filter: blur(5px);
  pointer-events: none;
  user-select: none;
  position: relative;
  max-height: 400px;
  overflow: hidden;
}

#stage2-results.locked::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 200px;
  background: linear-gradient(transparent, var(--color-bg-subtle));
  pointer-events: none;
}

#stage2-results.visible {
  filter: none;
  pointer-events: auto;
  user-select: auto;
  max-height: none;
  overflow: visible;
  animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Kostenvergleich */
.detail-section {
  margin-bottom: 32px;
}

.detail-section h3 {
  font-size: 1.1rem;
  color: var(--color-primary-dark);
  margin-bottom: 16px;
}

.cost-comparison {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 24px;
}

.cost-column {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-sm);
}

.cost-column h4 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid;
}

.cost-old h4 {
  color: var(--color-danger);
  border-color: var(--color-danger);
}

.cost-new h4 {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.cost-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  font-size: 0.9rem;
}

.cost-row.total {
  font-weight: 700;
  border-top: 1px solid var(--color-border);
  padding-top: 8px;
  margin-top: 4px;
}

/* Detail-Grid */
.detail-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.detail-item {
  display: flex;
  justify-content: space-between;
  padding: 8px 12px;
  background: var(--color-bg);
  border-radius: var(--radius);
  font-size: 0.85rem;
}

.detail-label {
  color: var(--color-text-muted);
}

.detail-value {
  font-weight: 700;
  color: var(--color-text);
}

/* Chart */
.chart-section {
  margin-bottom: 32px;
}

.chart-section h3 {
  font-size: 1.1rem;
  color: var(--color-primary-dark);
  margin-bottom: 12px;
}

.chart-container {
  position: relative;
  width: 100%;
  height: 280px;
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  padding: 12px;
  box-shadow: var(--shadow-sm);
}

/* Cashflow-Tabelle */
.cashflow-table-section {
  margin-bottom: 32px;
}

.cashflow-table-section h3 {
  font-size: 1.1rem;
  color: var(--color-primary-dark);
  margin-bottom: 12px;
}

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.cashflow-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.cashflow-table thead {
  background: var(--color-primary-dark);
  color: #fff;
}

.cashflow-table th {
  padding: 10px 8px;
  text-align: right;
  font-weight: 600;
  font-size: 0.75rem;
  white-space: nowrap;
}

.cashflow-table th:first-child {
  text-align: center;
}

.cashflow-table td {
  padding: 8px;
  text-align: right;
  border-bottom: 1px solid var(--color-bg-subtle);
}

.cashflow-table td:first-child {
  text-align: center;
  font-weight: 600;
}

.cashflow-table tr:nth-child(even) {
  background: var(--color-bg-subtle);
}

.cashflow-table tr.amortisiert td {
  background: rgba(26, 107, 60, 0.08);
}

.cashflow-table tr.amortisation-jahr td {
  background: rgba(245, 158, 11, 0.15);
  font-weight: 700;
}

/* Aktions-Bereich */
.action-section {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

.btn-pdf {
  display: block;
  width: 100%;
  padding: 14px 24px;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-primary);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-pdf:hover {
  background: var(--color-primary-light);
}

/* CTA-Box */
.cta-box {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
  color: #fff;
}

.cta-box h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
  color: #fff;
}

.cta-box p {
  font-size: 0.9rem;
  opacity: 0.9;
  margin-bottom: 16px;
}

.btn-cta {
  display: inline-block;
  padding: 12px 32px;
  background: var(--color-accent);
  color: var(--color-primary-dark);
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  transition: all var(--transition);
}

.btn-cta:hover {
  background: #e8900a;
  transform: translateY(-1px);
}

/* Footer */
.calc-footer {
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.disclaimer {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

/* Tablet (>=640px) */
@media (min-width: 640px) {
  .calculator-wrapper {
    padding: 24px;
  }

  .calc-header h1 {
    font-size: 1.8rem;
  }

  .mode-tabs {
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
  }

  .tab-btn {
    font-size: 0.9rem;
    padding: 12px 16px;
  }

  .form-grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  fieldset {
    padding: 20px;
  }

  .result-cards {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .cost-comparison {
    grid-template-columns: 1fr 1fr;
  }

  .detail-grid {
    grid-template-columns: 1fr 1fr;
  }

  .chart-container {
    height: 350px;
  }

  .gate-form {
    flex-direction: row;
    max-width: 500px;
  }

  .gate-form input[type="email"] {
    flex: 1;
    text-align: left;
  }
}

/* Desktop (>=1024px) */
@media (min-width: 1024px) {
  .calc-header h1 {
    font-size: 2rem;
  }

  .result-cards {
    grid-template-columns: repeat(3, 1fr);
  }

  .chart-container {
    height: 420px;
    padding: 16px;
  }

  .cashflow-table {
    font-size: 0.85rem;
  }

  .action-section {
    flex-direction: row;
  }

  .btn-pdf {
    width: auto;
    flex-shrink: 0;
  }

  .cta-box {
    flex: 1;
  }
}

/* ==========================================================================
   Utility
   ========================================================================== */

.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ==========================================================================
   Tooltips
   ========================================================================== */

.tooltip-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  margin-left: 4px;
  padding: 0;
  border: none;
  background: #1f2937;
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  line-height: 1;
  cursor: help;
  vertical-align: middle;
  border-radius: 50%;
  transition: background var(--transition);
  position: relative;
  top: -1px;
}

.tooltip-trigger:hover,
.tooltip-trigger:focus {
  background: var(--color-primary);
  outline: none;
}

.tooltip-content {
  position: absolute;
  z-index: 10000;
  max-width: 300px;
  padding: 10px 14px;
  background: #1f2937;
  color: #f3f4f6;
  font-size: 0.8rem;
  font-weight: 400;
  line-height: 1.5;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  pointer-events: none;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.tooltip-content.tooltip-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* Pfeil oben (Tooltip über dem Trigger) */
.tooltip-content::before {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 50%;
  transform: translateX(-50%);
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 6px solid #1f2937;
}

/* Pfeil unten (Tooltip unter dem Trigger) */
.tooltip-content.tooltip-below::before {
  bottom: auto;
  top: -5px;
  border-top: none;
  border-bottom: 6px solid #1f2937;
}

@media (max-width: 639px) {
  .tooltip-content {
    max-width: calc(100vw - 32px);
  }
}