/* ==========================================================================
   BUTTON COMPONENTS
   Mobile-First Button System
   
   Dokumentation für Studenten:
   - Mobile: Mindestgröße 44x44px (Touch-Target)
   - Desktop: Größere Padding für bessere Ästhetik
   - Classroom Mode: Noch größer für Präsentationen
   - Keine !important (außer Utilities)
   ========================================================================== */

/* ========================================================================
   BASE BUTTON (Mobile First)
   ======================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.75rem 1.25rem; /* Mobile: kompakt */
  min-height: 44px; /* Touch-Target Mindestgröße */
  min-width: 44px;
  
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  line-height: 1;
  text-decoration: none;
  text-align: center;
  white-space: nowrap;
  
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  
  cursor: pointer;
  transition: var(--transition-colors), var(--transition-transform), var(--transition-shadow);
  
  /* Accessibility */
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

/* Hover States - nur auf Desktop (kein :hover auf Touch) */
@media (hover: hover) {
  .btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
  }
}

/* Active State */
.btn:active {
  transform: translateY(0);
  box-shadow: none;
}

/* Focus State */
.btn:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* Disabled State */
.btn:disabled,
.btn--disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

/* ========================================================================
   BUTTON SIZES
   ======================================================================== */

/* Small - für sekundäre Aktionen */
.btn--sm {
  padding: 0.5rem 0.875rem;
  font-size: var(--text-xs);
  min-height: 36px;
  border-radius: var(--radius-sm);
}

/* Large - für primäre CTA */
.btn--lg {
  padding: 1rem 1.75rem; /* Mobile */
  font-size: var(--text-base);
  min-height: 52px;
  border-radius: var(--radius-lg);
}

/* Tablet+ */
@media (min-width: 768px) {
  .btn--lg {
    padding: 1.125rem 2rem;
    font-size: var(--text-lg);
    min-height: 56px;
  }
}

/* Extra Large - für Hero CTAs */
.btn--xl {
  padding: 1.125rem 2rem;
  font-size: var(--text-base);
  min-height: 56px;
  border-radius: var(--radius-lg);
}

@media (min-width: 768px) {
  .btn--xl {
    padding: 1.25rem 2.5rem;
    font-size: var(--text-lg);
    min-height: 60px;
  }
}

/* Full Width - Mobile Optimierung */
.btn--full {
  width: 100%;
}

@media (min-width: 768px) {
  .btn--full {
    width: auto;
  }
}

/* ========================================================================
   BUTTON VARIANTS
   ======================================================================== */

/* PRIMARY - Hauptaktion */
.btn--primary {
  background: var(--gradient-primary);
  color: white;
  border-color: transparent;
  box-shadow: 0 4px 14px rgba(88, 166, 255, 0.3);
}

@media (hover: hover) {
  .btn--primary:hover {
    box-shadow: 0 6px 20px rgba(88, 166, 255, 0.4);
  }
}

.btn--primary:active {
  box-shadow: 0 2px 8px rgba(88, 166, 255, 0.3);
}

/* SECONDARY - Alternative Aktion */
.btn--secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border-color: var(--border-primary);
}

@media (hover: hover) {
  .btn--secondary:hover {
    background: var(--bg-card);
    border-color: var(--accent-primary);
  }
}

/* GHOST - Subtile Aktion */
.btn--ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: var(--border-primary);
}

@media (hover: hover) {
  .btn--ghost:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--text-secondary);
  }
}

/* OUTLINE - Akzentuiert */
.btn--outline {
  background: transparent;
  color: var(--accent-primary);
  border-color: var(--accent-primary);
}

@media (hover: hover) {
  .btn--outline:hover {
    background: rgba(88, 166, 255, 0.1);
  }
}

/* SUPPORT - Spenden/Button */
.btn--support {
  background: linear-gradient(135deg, var(--accent-pink), var(--accent-orange));
  color: white;
  border-color: transparent;
  box-shadow: 0 4px 14px rgba(236, 72, 153, 0.3);
}

@media (hover: hover) {
  .btn--support:hover {
    box-shadow: 0 6px 20px rgba(236, 72, 153, 0.4);
  }
}

/* Academy-spezifische Buttons */
.btn--academy-junior {
  background: var(--gradient-primary);
  color: white;
  border-color: transparent;
}

.btn--academy-premium {
  background: var(--gradient-orange);
  color: white;
  border-color: transparent;
}

.btn--academy-senior {
  background: var(--gradient-green);
  color: white;
  border-color: transparent;
}

/* ========================================================================
   BUTTON WITH ICON
   ======================================================================== */

.btn .ph,
.btn svg {
  font-size: 1.2em;
  flex-shrink: 0;
}

/* Icon nur (kein Text) */
.btn--icon {
  padding: 0.75rem;
  aspect-ratio: 1;
}

.btn--icon.btn--sm {
  padding: 0.5rem;
}

/* ========================================================================
   BUTTON GROUPS
   ======================================================================== */

.btn-group {
  display: flex;
  flex-direction: column; /* Mobile: stacked */
  gap: var(--space-3);
}

@media (min-width: 480px) {
  .btn-group {
    flex-direction: row;
    flex-wrap: wrap;
  }
}

/* ========================================================================
   SCROLL INDICATOR
   ======================================================================== */

.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  
  color: var(--text-secondary);
  font-size: var(--text-xs);
  text-decoration: none;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  50% {
    transform: translateX(-50%) translateY(8px);
  }
}

/* Keine Animation im Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  .scroll-indicator {
    animation: none;
  }
}

.scroll-indicator .ph {
  font-size: 1.5rem;
}

@media (hover: hover) {
  .scroll-indicator:hover {
    color: var(--text-primary);
  }
}





/* ========================================================================
   LIGHT MODE - Premium Button Styling
   ======================================================================== */

/* Light Mode: Primary Button - Enhanced Glow */
html.light-theme .btn--primary {
  box-shadow: 
    0 4px 14px rgba(88, 166, 255, 0.4),
    0 0 20px rgba(88, 166, 255, 0.2);
}

html.light-theme .btn--primary:hover {
  box-shadow: 
    0 6px 20px rgba(88, 166, 255, 0.5),
    0 0 30px rgba(88, 166, 255, 0.3);
}

/* Light Mode: Ghost Button */
html.light-theme .btn--ghost {
  background: rgba(255, 255, 255, 0.8);
  border-color: rgba(88, 166, 255, 0.25);
  color: var(--accent-primary);
}

html.light-theme .btn--ghost:hover {
  background: rgba(88, 166, 255, 0.1);
  border-color: rgba(88, 166, 255, 0.4);
}

/* Light Mode: Support Button - Pink/Orange Glow */
html.light-theme .btn--support {
  box-shadow: 
    0 4px 14px rgba(236, 72, 153, 0.4),
    0 0 20px rgba(236, 72, 153, 0.2);
}