/* ========================================
   FORM BUTTON COMPONENT
   ======================================== */

.form-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--button-padding-y) var(--button-padding-x);
    font-family: var(--font-family-base);
    font-size: var(--button-font-size);
    font-weight: var(--font-weight-bold);
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition:
        background-color var(--transition-base),
        border-color var(--transition-base),
        color var(--transition-base),
        transform var(--transition-fast),
        box-shadow var(--transition-base);
    position: relative;
    overflow: hidden;
}

.form-btn:focus {
    outline: none;
}

.form-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none !important;
}

/* Variants */
.form-btn-primary {
    background: var(--color-brand-primary);
    color: var(--color-text-inverse);
}

.form-btn-primary:hover:not(:disabled) {
    background-color: var(--color-brand-primary-dark);
    border-color: var(--color-brand-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 116, 229, 0.35);
}

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

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

.form-btn-secondary:hover:not(:disabled) {
    background-color: var(--color-text-muted);
    color: var(--color-text-inverse);
    border-color: var(--color-text-muted);
}

.form-btn-secondary:active:not(:disabled) {
    transform: translateY(0);
}

.form-btn-outline {
    background-color: transparent;
    color: var(--color-brand-primary);
    border-color: var(--color-brand-primary);
}

.form-btn-outline:hover:not(:disabled) {
    background-color: var(--color-brand-primary);
    color: var(--color-text-inverse);
}

.form-btn-danger {
    background-color: var(--color-error);
    color: var(--color-text-inverse);
    border-color: var(--color-error);
}

.form-btn-danger:hover:not(:disabled) {
    background-color: #b02a37;
    border-color: #b02a37;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(220, 53, 69, 0.35);
}

.form-btn-danger:active:not(:disabled) {
    transform: translateY(0);
}

/* Sizes */
.form-btn-small {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-sm);
}

.form-btn-large {
    padding: var(--space-5) var(--space-8);
    font-size: var(--font-size-lg);
}

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

/* Loading State */
.form-btn-spinner {
    position: absolute;
    display: none;
}

.form-btn-loading .form-btn-text {
    opacity: 0;
}

.form-btn-loading .form-btn-spinner {
    display: block;
}

.form-btn-spinner-svg {
    width: 20px;
    height: 20px;
    animation: form-btn-spin 0.8s linear infinite;
}

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

/* Icon */
.form-btn-icon {
    font-size: 1.1em;
}