/**
 * KMC BROKER - Button Components
 * Modern button styles with variants and states
 */

/* ===== BASE BUTTON ===== */
.kmc-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-primary);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  vertical-align: middle;
  cursor: pointer;
  user-select: none;
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  transition: all var(--duration-base) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.kmc-btn:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

.kmc-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

/* ===== BUTTON SIZES ===== */
.kmc-btn--sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  gap: var(--space-1);
}

.kmc-btn--md {
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
}

.kmc-btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

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

/* Primary */
.kmc-btn--primary {
  background: linear-gradient(135deg, var(--color-primary-600) 0%, var(--color-primary-700) 100%);
  color: white;
  box-shadow: var(--shadow-sm);
}

.kmc-btn--primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  background: linear-gradient(135deg, var(--color-primary-500) 0%, var(--color-primary-600) 100%);
}

.kmc-btn--primary:active:not(:disabled) {
  transform: translateY(0);
}

/* Secondary */
.kmc-btn--secondary {
  background: var(--color-neutral-100);
  color: var(--text-primary);
  border-color: var(--border-primary);
}

.kmc-btn--secondary:hover:not(:disabled) {
  background: var(--color-neutral-200);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Outline */
.kmc-btn--outline {
  background: transparent;
  color: var(--color-primary-600);
  border-color: var(--color-primary-600);
}

.kmc-btn--outline:hover:not(:disabled) {
  background: var(--color-primary-50);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Ghost */
.kmc-btn--ghost {
  background: transparent;
  color: var(--text-primary);
  border-color: transparent;
}

.kmc-btn--ghost:hover:not(:disabled) {
  background: var(--color-neutral-100);
}

/* Danger */
.kmc-btn--danger {
  background: var(--color-danger-500);
  color: white;
  box-shadow: var(--shadow-sm);
}

.kmc-btn--danger:hover:not(:disabled) {
  background: var(--color-danger-600);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* ===== BUTTON STATES ===== */

/* Loading */
.kmc-btn--loading {
  position: relative;
  color: transparent;
  pointer-events: none;
}

.kmc-btn__spinner {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 16px;
  height: 16px;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: var(--radius-full);
  animation: spin 0.6s linear infinite;
  color: white;
}

/* ===== BUTTON ICONS ===== */
.kmc-btn__icon {
  display: inline-flex;
  font-size: 1.2em;
}

.kmc-btn__icon--left {
  margin-right: var(--space-1);
}

.kmc-btn__icon--right {
  margin-left: var(--space-1);
}

/* ===== BUTTON GROUPS ===== */
.kmc-btn-group {
  display: inline-flex;
  gap: var(--space-2);
}

.kmc-btn-group--vertical {
  flex-direction: column;
}

/* ===== DARK MODE ===== */
[data-theme="dark"] .kmc-btn--secondary {
  background: var(--color-neutral-800);
  border-color: var(--color-neutral-700);
}

[data-theme="dark"] .kmc-btn--secondary:hover:not(:disabled) {
  background: var(--color-neutral-700);
}

[data-theme="dark"] .kmc-btn--ghost:hover:not(:disabled) {
  background: var(--color-neutral-800);
}

[data-theme="dark"] .kmc-btn--outline {
  color: var(--color-primary-400);
  border-color: var(--color-primary-400);
}

[data-theme="dark"] .kmc-btn--outline:hover:not(:disabled) {
  background: rgba(99, 102, 241, 0.1);
}