/* ============================================
   CREDO CI — Interaktive Beitragseingruppierung
   FES Minden Förderverein
   ============================================ */

:root {
  /* CREDO CI Farben */
  --credo-gelb: #fbc900;
  --credo-gruen: #67ad2f;
  --credo-rot: #e30613;
  --credo-blau: #009acb;
  --credo-grau: #575756;

  /* Erweiterte Palette */
  --credo-blau-hell: #e6f5fa;
  --credo-blau-hover: #007da8;
  --credo-gruen-hell: #eef7e6;
  --credo-gelb-hell: #fef8e0;
  --credo-rot-hell: #fce6e7;

  /* Neutrals */
  --bg: #fafafa;
  --bg-card: #ffffff;
  --text: #2c2c2c;
  --text-muted: #757575;
  --border: #e8e8e8;
  --border-active: var(--credo-blau);

  /* Layout */
  --max-width: 720px;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 4px 24px rgba(0, 0, 0, 0.1);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Base */
html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  min-height: 100vh;
}

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
}

.header__logo {
  height: 56px;
  width: auto;
}

/* Hero / Begrüßung */
.hero {
  text-align: center;
  padding: 48px 0 32px;
}

.hero__greeting {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.hero__subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

/* Sections */
.section {
  margin-bottom: 40px;
}

.section__label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 16px;
}

/* Kinder-Auswahl */
.kinder-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.kinder-card {
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 12px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.kinder-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  opacity: 0;
  transition: opacity var(--transition);
}

.kinder-card:nth-child(1)::before { background: var(--credo-gelb); }
.kinder-card:nth-child(2)::before { background: var(--credo-gruen); }
.kinder-card:nth-child(3)::before { background: var(--credo-rot); }
.kinder-card:nth-child(4)::before { background: var(--credo-blau); }

.kinder-card:hover {
  border-color: var(--credo-blau);
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.kinder-card.active {
  border-color: var(--credo-blau);
  background: var(--credo-blau-hell);
  box-shadow: var(--shadow-hover);
}

.kinder-card.active::before {
  opacity: 1;
}

.kinder-card__number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--credo-grau);
  transition: color var(--transition);
}

.kinder-card.active .kinder-card__number {
  color: var(--credo-blau);
}

.kinder-card__label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Kinder-Input (4+) */
.kinder-input-wrap {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.3s ease, opacity 0.3s ease, margin 0.3s ease;
  margin-top: 0;
}

.kinder-card.active .kinder-input-wrap {
  max-height: 60px;
  opacity: 1;
  margin-top: 12px;
}

.kinder-input {
  width: 64px;
  padding: 8px 4px;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 1.2rem;
  font-weight: 700;
  text-align: center;
  color: var(--credo-blau);
  background: var(--bg-card);
  outline: none;
  transition: border-color var(--transition);
  -moz-appearance: textfield;
}

.kinder-input::-webkit-outer-spin-button,
.kinder-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.kinder-input:focus {
  border-color: var(--credo-blau);
}

/* Einkommens-Auswahl */
.einkommen-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.einkommen-option {
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.einkommen-option:hover {
  border-color: var(--credo-blau);
  background: var(--credo-blau-hell);
}

.einkommen-option.active {
  border-color: var(--credo-blau);
  background: var(--credo-blau-hell);
  box-shadow: 0 0 0 1px var(--credo-blau);
}

.einkommen-option__range {
  font-size: 1rem;
  font-weight: 500;
}

.einkommen-option__betrag {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--credo-blau);
  opacity: 0;
  transform: translateX(10px);
  transition: all var(--transition);
  white-space: nowrap;
}

.einkommen-option.active .einkommen-option__betrag,
.einkommen-option:hover .einkommen-option__betrag {
  opacity: 1;
  transform: translateX(0);
}

/* Ergebnis */
.ergebnis {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 40px;
  text-align: center;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
}

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

.ergebnis__label {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.ergebnis__betrag {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--credo-blau);
  line-height: 1.1;
  margin-bottom: 4px;
  transition: all var(--transition);
}

.ergebnis__einheit {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.ergebnis__details {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  line-height: 1.6;
}

/* Submit Button */
.btn-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--credo-blau);
  color: #fff;
  border: none;
  border-radius: 12px;
  padding: 16px 40px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  min-width: 280px;
}

.btn-submit:hover {
  background: var(--credo-blau-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0, 154, 203, 0.3);
}

.btn-submit:active {
  transform: translateY(0);
}

.btn-submit:disabled {
  background: #ccc;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-submit--loading {
  position: relative;
  color: transparent;
}

.btn-submit--loading::after {
  content: "";
  position: absolute;
  width: 22px;
  height: 22px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Erfolg */
.erfolg {
  text-align: center;
  padding: 64px 24px;
  display: none;
}

.erfolg.visible {
  display: block;
  animation: fadeInUp 0.6s ease;
}

.erfolg__icon {
  width: 80px;
  height: 80px;
  background: var(--credo-gruen);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
}

.erfolg__icon svg {
  width: 40px;
  height: 40px;
  fill: none;
  stroke: #fff;
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.erfolg__title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.erfolg__text {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.7;
}

/* Fehler-Seite */
.fehler {
  text-align: center;
  padding: 80px 24px;
  display: none;
}

.fehler.visible {
  display: block;
}

.fehler__title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.fehler__text {
  color: var(--text-muted);
  line-height: 1.7;
}

/* App-Container (für show/hide) */
.app {
  display: none;
  padding-bottom: 64px;
}

.app.visible {
  display: block;
  animation: fadeIn 0.5s ease;
}

/* Footer */
.footer {
  text-align: center;
  padding: 32px 0;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
  margin-top: 48px;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Info-Hinweis */
.info-box {
  background: var(--credo-blau-hell);
  border-left: 4px solid var(--credo-blau);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 16px 20px;
  margin-bottom: 32px;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text);
}

/* Responsive */
@media (max-width: 600px) {
  .kinder-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero__greeting {
    font-size: 1.4rem;
  }

  .ergebnis {
    padding: 28px 20px;
  }

  .ergebnis__betrag {
    font-size: 2.8rem;
  }

  .btn-submit {
    width: 100%;
    min-width: unset;
  }

  .container {
    padding: 0 16px;
  }
}

@media (max-width: 380px) {
  .kinder-grid {
    gap: 8px;
  }

  .kinder-card {
    padding: 16px 8px;
  }

  .kinder-card__number {
    font-size: 1.5rem;
  }
}