.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  font-family: var(--font-tertiary);
  position: relative;
  overflow: hidden;
}

/* PRIMARY BUTTON */
.btn-primary {
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--primary-dark)
  );
  color: #fff;
  box-shadow: var(--shadow-md);
}

.btn-primary::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition:
    width 300ms,
    height 300ms;
}

.btn-primary:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: white;
}

/* SECONDARY BUTTON */
.btn-secondary {
  background: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
  transition: all var(--transition-normal);
}

.btn-secondary:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-2px);
}

.btn-secondary::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--primary-color);
  z-index: -1;
  transition: left 300ms;
}

.btn-secondary:hover::after {
  left: 0;
}

.btn-secondary:active {
  transform: translateY(0);
}
/* LARGE BUTTON */
.btn-large {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: var(--font-size-lg);
  border-radius: var(--radius-lg);
}

/* BUTTON DISABLED  */
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* LOADING STATE */
.btn-loading {
  pointer-events: none;
}

.btn-loading::after {
  content: "";
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-top-color: white;
  border-radius: var(--radius-full);
  animation: spin 0.8s linear infinite;
}

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

/* GROUP BUTTONS */
.btn-group {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.btn-group .btn {
  flex: 1;
  min-width: 120px;
}

/* ICON BUTTON */
.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* FLOATING BUTTON */
.btn-fab {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-chatbot-icon);
  box-shadow: var(--shadow-xl);
}

@media (max-width: 768px) {
  .btn-large {
    width: 100%;
  }

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

  .btn-group .btn {
    width: 100%;
  }
}