/* ===========================================
   BUTTON COMPONENT STYLES
   =========================================== */

/* Base Button Styles */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    user-select: none;
    line-height: 1.5;
    min-height: 44px; /* Touch-friendly minimum height */
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.3);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* Button Variants */
.btn--primary {
    background-color: var(--secondary-color);
    color: var(--white);
    border: 2px solid var(--secondary-color);
}

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

.btn--secondary {
    background-color: transparent;
    color: var(--secondary-color);
    border: 2px solid var(--secondary-color);
}

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

.btn--outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

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

.btn--danger {
    background-color: var(--danger-color);
    color: var(--white);
    border: 2px solid var(--danger-color);
}

.btn--danger:hover:not(:disabled) {
    background-color: #c0392b;
    border-color: #c0392b;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn--success {
    background-color: var(--success-color);
    color: var(--white);
    border: 2px solid var(--success-color);
}

.btn--success:hover:not(:disabled) {
    background-color: #219a52;
    border-color: #219a52;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn--warning {
    background-color: var(--warning-color);
    color: var(--white);
    border: 2px solid var(--warning-color);
}

.btn--warning:hover:not(:disabled) {
    background-color: #e67e22;
    border-color: #e67e22;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Button Sizes */
.btn--small {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
    min-height: 36px;
}

.btn--large {
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: var(--font-size-lg);
    min-height: 52px;
}

.btn--extra-large {
    padding: var(--spacing-lg) var(--spacing-3xl);
    font-size: var(--font-size-xl);
    min-height: 60px;
}

/* Button Groups */
.btn-group {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.btn-group--vertical {
    flex-direction: column;
    align-items: stretch;
}

.btn-group--centered {
    justify-content: center;
}

.btn-group--spaced {
    justify-content: space-between;
}

/* Icon Buttons */
.btn--icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    min-width: 44px;
    min-height: 44px;
}

.btn--icon-only {
    padding: var(--spacing-sm);
    min-width: 44px;
    min-height: 44px;
}

.btn--icon-only .btn__icon {
    margin: 0;
}

.btn__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    margin-right: var(--spacing-xs);
}

.btn__icon svg {
    width: 100%;
    height: 100%;
    fill: currentColor;
}

.btn--icon .btn__icon:last-child {
    margin-right: 0;
    margin-left: var(--spacing-xs);
}

/* Floating Action Button */
.btn--fab {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
}

.btn--fab:hover:not(:disabled) {
    transform: scale(1.1);
    box-shadow: var(--shadow-xl);
}

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

.btn--loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: btn-spin 1s linear infinite;
}

@keyframes btn-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .btn {
        min-height: 48px; /* Larger touch target on mobile */
    }
    
    .btn--small {
        min-height: 40px;
    }
    
    .btn--large {
        min-height: 56px;
    }
    
    .btn--fab {
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
        width: 48px;
        height: 48px;
    }
    
    .btn-group {
        flex-direction: column;
        width: 100%;
    }
    
    .btn-group .btn {
        width: 100%;
    }
}