/* =====================================================
   UTILITY CLASSES & COMMON COMPONENTS
   ===================================================== */

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 18px;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(44, 82, 130, 0.3);
    transition: var(--transition);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(44, 82, 130, 0.4);
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.spinner {
    border: 3px solid rgba(44, 82, 130, 0.1);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    width: 30px;
    height: 30px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

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

/* Button Styles */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(44, 82, 130, 0.3);
}

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

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

.btn-outline {
    background: transparent;
    color: var(--text-dark);
    border: 2px solid var(--medium-bg);
}

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

.btn-small {
    padding: 8px 16px;
    font-size: 12px;
}

.btn-large {
    padding: 16px 32px;
    font-size: 16px;
}

/* Card Styles */
.card {
    background: var(--white);
    border-radius: 12px;
    box-shadow: var(--box-shadow);
    overflow: hidden;
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 35px rgba(44, 82, 130, 0.15);
}

.card-header {
    padding: 20px;
    background: linear-gradient(135deg, var(--light-bg) 0%, var(--medium-bg) 100%);
    border-bottom: 1px solid rgba(44, 82, 130, 0.1);
}

.card-body {
    padding: 20px;
}

.card-footer {
    padding: 15px 20px;
    background: var(--light-bg);
    border-top: 1px solid rgba(44, 82, 130, 0.1);
}

/* Alert Styles */
.alert {
    padding: 15px 20px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    border-left: 4px solid;
}

.alert-success {
    background: #D4EDDA;
    color: #155724;
    border-left-color: #28A745;
}

.alert-warning {
    background: #FFF3CD;
    color: #856404;
    border-left-color: #FFC107;
}

.alert-error {
    background: #F8D7DA;
    color: #721C24;
    border-left-color: #DC3545;
}

.alert-info {
    background: #D1ECF1;
    color: #0C5460;
    border-left-color: #17A2B8;
}

/* Badge Styles */
.badge {
    display: inline-block;
    padding: 4px 8px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: 20px;
    line-height: 1;
}

.badge-primary {
    background: var(--primary-color);
    color: white;
}

.badge-secondary {
    background: var(--medium-bg);
    color: var(--text-dark);
}

.badge-success {
    background: #28A745;
    color: white;
}

.badge-warning {
    background: #FFC107;
    color: var(--text-dark);
}

.badge-error {
    background: #DC3545;
    color: white;
}

/* Form Styles */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: var(--text-dark);
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--medium-bg);
    border-radius: var(--border-radius);
    font-size: 14px;
    background: var(--white);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(44, 82, 130, 0.1);
}

.form-control.error {
    border-color: #DC3545;
}

.form-control.success {
    border-color: #28A745;
}

/* Text Utilities */
.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.text-primary {
    color: var(--primary-color);
}

.text-secondary {
    color: var(--text-medium);
}

.text-muted {
    color: var(--text-light);
}

.text-white {
    color: white;
}

.text-small {
    font-size: 12px;
}

.text-large {
    font-size: 18px;
}

.font-weight-light {
    font-weight: 300;
}

.font-weight-normal {
    font-weight: 400;
}

.font-weight-medium {
    font-weight: 500;
}

.font-weight-semibold {
    font-weight: 600;
}

.font-weight-bold {
    font-weight: 700;
}

/* Spacing Utilities */
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mt-5 { margin-top: 40px; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.mb-5 { margin-bottom: 40px; }

.ml-0 { margin-left: 0; }
.ml-1 { margin-left: 8px; }
.ml-2 { margin-left: 16px; }
.ml-3 { margin-left: 24px; }
.ml-4 { margin-left: 32px; }
.ml-5 { margin-left: 40px; }

.mr-0 { margin-right: 0; }
.mr-1 { margin-right: 8px; }
.mr-2 { margin-right: 16px; }
.mr-3 { margin-right: 24px; }
.mr-4 { margin-right: 32px; }
.mr-5 { margin-right: 40px; }

.pt-0 { padding-top: 0; }
.pt-1 { padding-top: 8px; }
.pt-2 { padding-top: 16px; }
.pt-3 { padding-top: 24px; }
.pt-4 { padding-top: 32px; }
.pt-5 { padding-top: 40px; }

.pb-0 { padding-bottom: 0; }
.pb-1 { padding-bottom: 8px; }
.pb-2 { padding-bottom: 16px; }
.pb-3 { padding-bottom: 24px; }
.pb-4 { padding-bottom: 32px; }
.pb-5 { padding-bottom: 40px; }

.pl-0 { padding-left: 0; }
.pl-1 { padding-left: 8px; }
.pl-2 { padding-left: 16px; }
.pl-3 { padding-left: 24px; }
.pl-4 { padding-left: 32px; }
.pl-5 { padding-left: 40px; }

.pr-0 { padding-right: 0; }
.pr-1 { padding-right: 8px; }
.pr-2 { padding-right: 16px; }
.pr-3 { padding-right: 24px; }
.pr-4 { padding-right: 32px; }
.pr-5 { padding-right: 40px; }

/* Display Utilities */
.d-none {
    display: none !important;
}

.d-block {
    display: block !important;
}

.d-inline {
    display: inline !important;
}

.d-inline-block {
    display: inline-block !important;
}

.d-flex {
    display: flex !important;
}

.d-grid {
    display: grid !important;
}

/* Flex Utilities */
.flex-row {
    flex-direction: row;
}

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

.justify-content-start {
    justify-content: flex-start;
}

.justify-content-center {
    justify-content: center;
}

.justify-content-end {
    justify-content: flex-end;
}

.justify-content-between {
    justify-content: space-between;
}

.align-items-start {
    align-items: flex-start;
}

.align-items-center {
    align-items: center;
}

.align-items-end {
    align-items: flex-end;
}

/* Mobile Utilities */
@media (max-width: 768px) {
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 16px;
    }
    
    .d-mobile-none {
        display: none !important;
    }
    
    .d-mobile-block {
        display: block !important;
    }
    
    .text-mobile-center {
        text-align: center;
    }
    
    .btn {
        width: 100%;
        margin-bottom: 10px;
    }
    
    .btn-small {
        width: auto;
        display: inline-block;
    }
}