/* ====================================
   UNIFIED BUTTON SYSTEM
   Based on settings panel button style
   ==================================== */

/* ===== Base Button ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 7px 18px;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 500;
  line-height: 1.4;
  color: var(--color-text-primary);
  background: var(--btn-bg);
  border: 1.5px solid var(--btn-border);
  border-radius: var(--radius-md);
  box-shadow: var(--btn-shadow);
  cursor: pointer;
  outline: none;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--transition-base),
              border-color var(--transition-base),
              box-shadow var(--transition-base),
              transform var(--transition-fast);
}

.btn:hover {
  background: var(--btn-bg-hover);
  border-color: var(--btn-border-hover);
}

.btn:active {
  transform: translateY(1px);
}

.btn:disabled,
.btn[disabled] {
  background: var(--color-bg-disabled);
  border-color: var(--color-border);
  color: var(--color-text-muted);
  cursor: not-allowed;
  opacity: 0.6;
  transform: none;
}

/* ===== Primary Button (Blue) ===== */
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
  border-color: var(--color-primary);
  color: white;
  box-shadow: 0 2px 4px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  border-color: var(--color-primary-dark);
  color: white;
  box-shadow: 0 4px 8px rgba(37, 99, 235, 0.3);
  transform: translateY(-1px);
}

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

.btn-primary:disabled {
  background: var(--color-primary-100);
  border-color: var(--color-primary-200);
  color: var(--color-primary-dark);
  box-shadow: none;
}

/* ===== Outline Primary Button ===== */
.btn-outline-primary {
  background: transparent;
  border-color: var(--color-primary);
  color: var(--color-primary);
  box-shadow: none;
}

.btn-outline-primary:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
  box-shadow: 0 2px 4px rgba(37, 99, 235, 0.2);
}

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

/* ===== Outline Button (Neutral) ===== */
.btn-outline {
  background: white;
  border: 2px solid var(--color-border);
  color: var(--color-text-primary);
  box-shadow: none;
}

.btn-outline:hover {
  border-color: var(--color-primary-light);
  color: var(--color-primary);
  background: white;
}

.btn-outline:active {
  background: var(--color-bg-alt);
}

/* ===== Secondary Button (Subtle but present) ===== */
.btn-secondary {
  background: var(--color-bg-alt);
  border-color: var(--color-border-strong, var(--color-border));
  color: var(--color-text-secondary);
}

.btn-secondary:hover {
  background: var(--color-bg-hover);
  border-color: var(--color-text-muted);
  color: var(--color-text-primary);
}

/* ===== Success Button (Green) ===== */
.btn-success {
  background: linear-gradient(135deg, var(--color-success-light) 0%, var(--color-success) 100%);
  border-color: var(--color-success);
  color: white;
  box-shadow: 0 2px 4px rgba(5, 150, 105, 0.2);
}

.btn-success:hover {
  background: linear-gradient(135deg, var(--color-success) 0%, var(--color-success-dark) 100%);
  border-color: var(--color-success-dark);
  color: white;
  box-shadow: 0 4px 8px rgba(5, 150, 105, 0.3);
  transform: translateY(-1px);
}

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

/* ===== Danger Button (Red) ===== */
.btn-danger {
  background: linear-gradient(135deg, var(--color-danger-light) 0%, var(--color-danger) 100%);
  border-color: var(--color-danger);
  color: white;
  box-shadow: 0 2px 4px rgba(220, 38, 38, 0.2);
}

.btn-danger:hover {
  background: linear-gradient(135deg, var(--color-danger) 0%, var(--color-danger-dark) 100%);
  border-color: var(--color-danger-dark);
  color: white;
  box-shadow: 0 4px 8px rgba(220, 38, 38, 0.3);
  transform: translateY(-1px);
}

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

/* ===== Warning Button (Orange) ===== */
.btn-warning {
  background: linear-gradient(135deg, var(--color-warning-light) 0%, var(--color-warning) 100%);
  border-color: var(--color-warning);
  color: white;
  box-shadow: 0 2px 4px rgba(245, 158, 11, 0.2);
}

.btn-warning:hover {
  background: linear-gradient(135deg, var(--color-warning) 0%, var(--color-warning-dark) 100%);
  border-color: var(--color-warning-dark);
  color: white;
  box-shadow: 0 4px 8px rgba(245, 158, 11, 0.3);
  transform: translateY(-1px);
}

/* ===== Premium Button (Orange gradient) ===== */
.btn-premium {
  background: linear-gradient(135deg, var(--color-premium-light) 0%, var(--color-premium) 100%);
  border-color: var(--color-premium);
  color: white;
  box-shadow: 0 2px 8px rgba(249, 115, 22, 0.3);
}

.btn-premium:hover {
  background: linear-gradient(135deg, var(--color-premium) 0%, var(--color-premium-dark) 100%);
  border-color: var(--color-premium-dark);
  color: white;
  box-shadow: 0 4px 12px rgba(249, 115, 22, 0.4);
  transform: translateY(-2px);
}

/* ===== Ghost Button (Transparent) ===== */
.btn-ghost {
  background: transparent;
  border-color: transparent;
  box-shadow: none;
}

.btn-ghost:hover {
  background: var(--color-bg-hover);
  border-color: transparent;
}

/* ===== Link Button (Text only) ===== */
.btn-link {
  background: transparent;
  border: none;
  box-shadow: none;
  color: var(--color-primary);
  padding: var(--space-1) var(--space-2);
}

.btn-link:hover {
  background: transparent;
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* ===== Size Variants ===== */
.btn-xs {
  padding: 2px 8px;
  font-size: var(--font-size-xs);
  border-radius: var(--radius-sm);
}

.btn-sm {
  padding: 4px 12px;
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: 12px 24px;
  font-size: var(--font-size-lg);
}

/* ===== Icon Button (Square) ===== */
.btn-icon {
  padding: var(--space-2);
  width: 36px;
  height: 36px;
}

.btn-icon.btn-sm {
  width: 28px;
  height: 28px;
  padding: var(--space-1);
}

.btn-icon.btn-lg {
  width: 44px;
  height: 44px;
  padding: var(--space-3);
}

/* ===== Round Button (Circle) ===== */
.btn-round {
  border-radius: var(--radius-full);
}

/* ===== Pill Button ===== */
.btn-pill {
  border-radius: var(--radius-full);
  padding: 4px 12px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ===== Block Button (Full width) ===== */
.btn-block {
  width: 100%;
}

/* ===== Button with Loading Spinner ===== */
.btn-loading {
  position: relative;
  pointer-events: none;
  opacity: 0.7;
}

.btn-loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: btn-spin 0.6s linear infinite;
}

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

/* ===== Button Group ===== */
.btn-group {
  display: inline-flex;
  gap: 0;
}

.btn-group .btn {
  border-radius: 0;
}

.btn-group .btn:first-child {
  border-radius: var(--radius-md) 0 0 var(--radius-md);
}

.btn-group .btn:last-child {
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.btn-group .btn:not(:last-child) {
  border-right-width: 0;
}

.btn-group .btn:not(:last-child):hover {
  border-right-width: 0;
}