/* 
 * Button Component Styles
 * Atelier Flint & Associates Architects Website
 * 
 * Comprehensive button styles following BEM methodology
 * with various sizes, states, and interactive effects.
 */

/* ==========================================================================
   BASE BUTTON STYLES
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-family-body);
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    border: 2px solid transparent;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    user-select: none;
    vertical-align: middle;
    white-space: nowrap;
}

.btn:focus {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
}

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

/* ==========================================================================
   BUTTON SIZES
   ========================================================================== */

.btn--sm {
    padding: var(--button-padding-sm);
    font-size: var(--font-size-sm);
    min-height: var(--button-height-sm);
    gap: var(--spacing-xs);
}

.btn--md {
    padding: var(--button-padding-md);
    font-size: var(--font-size-base);
    min-height: var(--button-height-md);
    gap: var(--spacing-sm);
}

.btn--lg {
    padding: var(--button-padding-lg);
    font-size: var(--font-size-lg);
    min-height: var(--button-height-lg);
    gap: var(--spacing-md);
}

/* Default size */
.btn {
    padding: var(--button-padding-md);
    font-size: var(--font-size-base);
    min-height: var(--button-height-md);
    gap: var(--spacing-sm);
}

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

/* Primary Button */
.btn--primary {
    background-color: var(--color-primary);
    color: var(--color-text-light);
    border-color: var(--color-primary);
}

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

.btn--primary:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

/* Secondary Button */
.btn--secondary {
    background-color: var(--color-secondary);
    color: var(--color-primary);
    border-color: var(--color-secondary);
}

.btn--secondary:hover {
    background-color: var(--color-primary);
    color: var(--color-text-light);
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn--secondary:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

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

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

.btn--outline:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

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

.btn--ghost:hover {
    background-color: var(--color-quaternary);
    color: var(--color-secondary);
    border-color: var(--color-secondary);
}

/* Light Button (for dark backgrounds) */
.btn--light {
    background-color: var(--color-text-light);
    color: var(--color-primary);
    border-color: var(--color-text-light);
}

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

/* Success Button */
.btn--success {
    background-color: var(--color-success);
    color: var(--color-text-light);
    border-color: var(--color-success);
}

.btn--success:hover {
    background-color: #218838;
    border-color: #1e7e34;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Danger Button */
.btn--danger {
    background-color: var(--color-error);
    color: var(--color-text-light);
    border-color: var(--color-error);
}

.btn--danger:hover {
    background-color: #c82333;
    border-color: #bd2130;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

.btn--loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 16px;
    border: 2px solid currentColor;
    border-top: 2px solid transparent;
    border-radius: var(--border-radius-full);
    animation: btnSpin 1s linear infinite;
    transform: translate(-50%, -50%);
}

@keyframes btnSpin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Active state */
.btn--active {
    background-color: var(--color-secondary);
    color: var(--color-primary);
    border-color: var(--color-secondary);
}

/* ==========================================================================
   BUTTON GROUPS
   ========================================================================== */

.btn-group {
    display: inline-flex;
    vertical-align: middle;
}

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

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

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

.btn-group .btn:not(:first-child) {
    margin-left: -2px;
}

.btn-group .btn:hover,
.btn-group .btn:focus,
.btn-group .btn--active {
    z-index: 1;
}

/* ==========================================================================
   SPECIAL BUTTON TYPES
   ========================================================================== */

/* Icon Button */
.btn--icon {
    width: var(--button-height-md);
    height: var(--button-height-md);
    padding: 0;
    border-radius: var(--border-radius-full);
}

.btn--icon.btn--sm {
    width: var(--button-height-sm);
    height: var(--button-height-sm);
}

.btn--icon.btn--lg {
    width: var(--button-height-lg);
    height: var(--button-height-lg);
}

/* Floating Action Button */
.btn--fab {
    position: fixed;
    width: 56px;
    height: 56px;
    padding: 0;
    border-radius: var(--border-radius-full);
    box-shadow: var(--shadow-lg);
    z-index: var(--z-index-fixed);
}

.btn--fab:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-xl);
}

/* Full width button */
.btn--block {
    display: flex;
    width: 100%;
}

/* ==========================================================================
   CTA BUTTONS (Call-to-Action)
   ========================================================================== */

.btn--cta {
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-tertiary) 100%);
    color: var(--color-text-light);
    border: none;
    box-shadow: var(--shadow-md);
}

.btn--cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 215, 0, 0.3), transparent);
    transition: left var(--transition-slow);
}

.btn--cta:hover::before {
    left: 100%;
}

.btn--cta:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
    background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-accent-orange) 100%);
    color: var(--color-primary);
}

/* ==========================================================================
   WHATSAPP BUTTON
   ========================================================================== */

.btn--whatsapp {
    background-color: #25D366;
    color: var(--color-text-light);
    border-color: #25D366;
    border-radius: var(--border-radius-full);
    box-shadow: var(--shadow-lg);
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    z-index: var(--z-index-fixed);
    width: 60px;
    height: 60px;
    padding: 0;
}

.btn--whatsapp:hover {
    background-color: #128C7E;
    transform: scale(1.1);
    box-shadow: var(--shadow-xl);
}

.btn--whatsapp i {
    font-size: var(--font-size-2xl);
}

/* ==========================================================================
   SCROLL TO TOP BUTTON
   ========================================================================== */

.btn--scroll-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: calc(var(--spacing-xl) + 80px); /* Offset from WhatsApp button */
    z-index: var(--z-index-fixed);
    width: 50px;
    height: 50px;
    padding: 0;
    border-radius: var(--border-radius-full);
    background-color: var(--color-secondary);
    color: var(--color-primary);
    border: none;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
}

.btn--scroll-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.btn--scroll-top:hover {
    background-color: var(--color-primary);
    color: var(--color-text-light);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* ==========================================================================
   RESPONSIVE ADJUSTMENTS
   ========================================================================== */

@media (max-width: 767px) {
    .btn--lg {
        padding: var(--button-padding-md);
        font-size: var(--font-size-base);
        min-height: var(--button-height-md);
    }
    
    .btn--whatsapp {
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
        width: 50px;
        height: 50px;
    }
    
    .btn--scroll-top {
        bottom: var(--spacing-lg);
        right: calc(var(--spacing-lg) + 70px);
        width: 45px;
        height: 45px;
    }
    
    .btn--whatsapp i {
        font-size: var(--font-size-xl);
    }
}

/* ==========================================================================
   ACCESSIBILITY ENHANCEMENTS
   ========================================================================== */

/* High contrast mode */
@media (prefers-contrast: high) {
    .btn {
        border-width: 3px;
    }
    
    .btn--outline {
        border-width: 3px;
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    .btn {
        transition: none;
    }
    
    .btn:hover {
        transform: none;
    }
    
    .btn--loading::after {
        animation: none;
    }
    
    .btn--cta::before {
        transition: none;
    }
}