/* ==========================================================================
   KleinBuchhaltung – components.css
   Reusable UI components: buttons, badges, tags
   ========================================================================== */

/* ==========================================================================
   BUTTON
   Base: .btn
   Variants: --primary, --accent, --ghost, --outline
   Sizes: --sm, --lg
   Modifiers: --full (full-width)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);

  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
  letter-spacing: 0.01em;

  padding: 0.6875rem 1.375rem;  /* 11px 22px */
  border-radius: var(--radius-md);
  border: 2px solid transparent;

  cursor: pointer;
  text-decoration: none;
  user-select: none;

  transition:
    background-color var(--transition-fast),
    border-color     var(--transition-fast),
    color            var(--transition-fast),
    box-shadow       var(--transition-fast),
    transform        var(--transition-fast);
}

.btn:active {
  transform: scale(0.97);
}

/* Disabled state */
.btn[disabled],
.btn[aria-disabled="true"] {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

/* ------------ Variant: primary (dark blue) ------------ */
.btn--primary {
  background-color: var(--color-primary);
  border-color:     var(--color-primary);
  color:            var(--color-text-inverse);
}

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  border-color:     var(--color-primary-dark);
  box-shadow:       var(--shadow-md);
}

/* ------------ Variant: accent (green) ------------ */
.btn--accent {
  background-color: var(--color-accent);
  border-color:     var(--color-accent);
  color:            var(--color-text-inverse);
}

.btn--accent:hover {
  background-color: var(--color-accent-hover);
  border-color:     var(--color-accent-hover);
  box-shadow:       0 4px 16px rgba(46, 125, 50, 0.35);
}

/* ------------ Variant: ghost (on dark background) ------------ */
.btn--ghost {
  background-color: transparent;
  border-color:     rgba(255, 255, 255, 0.3);
  color:            rgba(255, 255, 255, 0.9);
}

.btn--ghost:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color:     rgba(255, 255, 255, 0.6);
  color:            #ffffff;
}

/* ------------ Variant: outline (on light background) ------------ */
.btn--outline {
  background-color: transparent;
  border-color:     var(--color-primary);
  color:            var(--color-primary);
}

.btn--outline:hover {
  background-color: var(--color-primary);
  color:            var(--color-text-inverse);
}

/* ------------ Size: small ------------ */
.btn--sm {
  font-size: var(--font-size-sm);
  padding: 0.4375rem 0.875rem;  /* 7px 14px */
}

/* ------------ Size: large ------------ */
.btn--lg {
  font-size: var(--font-size-lg);
  padding: 0.875rem 1.875rem;  /* 14px 30px */
}

/* ------------ Modifier: full width ------------ */
.btn--full {
  width: 100%;
}