/* Reset and Base Styles */
* {
    box-sizing: border-box;
}

:root {
    --color-1: #F8B195;
    --color-2: #F67280;
    --color-3: #C06C84;
    --color-4: #6C5B7B;
    --color-5: #355C7D;
    
    --gradient-primary: linear-gradient(135deg, var(--color-5), var(--color-4));
    --gradient-secondary: linear-gradient(135deg, var(--color-3), var(--color-2));
    --gradient-accent: linear-gradient(135deg, var(--color-2), var(--color-1));
    
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
    
    --border-radius: 0.5rem;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    min-height: 100vh;
}

/* Header Styles */
.header-gradient {
    background: var(--gradient-primary);
}

.header-gradient h1 {
    font-weight: 600;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Card Styles */
.card {
    border: none;
    border-radius: var(--border-radius);
    transition: var(--transition);
    overflow: hidden;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.calculator-card .card-header,
.results-card .card-header {
    background: var(--gradient-primary) !important;
    border: none;
    padding: 1rem 1.5rem;
}

.bg-gradient {
    background: var(--gradient-primary) !important;
}

/* Form Styles */
.form-control,
.form-select {
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    padding: 0.75rem 1rem;
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--color-4);
    box-shadow: 0 0 0 0.2rem rgba(108, 91, 123, 0.25);
}

.form-label {
    font-weight: 600;
    color: var(--color-5);
    margin-bottom: 0.5rem;
}

.form-label i {
    margin-right: 0.5rem;
}

/* Button Styles */
.btn {
    border-radius: var(--border-radius);
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    transition: var(--transition);
    border: none;
}

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

.btn-gradient:hover {
    background: var(--gradient-secondary);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
}

/* Results Styles */
.results-container {
    padding: 2rem 0;
}

.result-item {
    background: linear-gradient(135deg, rgba(248, 177, 149, 0.1), rgba(246, 114, 128, 0.1));
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-left: 4px solid var(--color-2);
    transition: var(--transition);
}

.result-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-sm);
}

.result-value {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--color-5);
    margin-bottom: 0.5rem;
}

.result-label {
    color: var(--color-4);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.result-positive {
    color: #28a745;
}

.result-negative {
    color: #dc3545;
}

/* Alert Styles */
.alert {
    border: none;
    border-radius: var(--border-radius);
    border-left: 4px solid;
}

.alert-success {
    background: linear-gradient(135deg, rgba(40, 167, 69, 0.1), rgba(40, 167, 69, 0.05));
    border-left-color: #28a745;
    color: #155724;
}

.alert-info {
    background: linear-gradient(135deg, rgba(23, 162, 184, 0.1), rgba(23, 162, 184, 0.05));
    border-left-color: #17a2b8;
    color: #0c5460;
}

.alert-warning {
    background: linear-gradient(135deg, rgba(255, 193, 7, 0.1), rgba(255, 193, 7, 0.05));
    border-left-color: #ffc107;
    color: #856404;
}

/* Modal Styles */
.modal-content {
    border: none;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.modal-header {
    border: none;
    padding: 1.5rem;
}

.modal-body {
    padding: 2rem 1.5rem;
}

.modal-footer {
    border: none;
    padding: 1rem 1.5rem 1.5rem;
}

/* Offcanvas Styles */
.offcanvas {
    border: none;
}

.offcanvas-header {
    border: none;
    padding: 1.5rem;
}

.offcanvas-body {
    padding: 1.5rem;
}

/* History Item Styles */
.history-item {
    background: rgba(255, 255, 255, 0.8);
    border-radius: var(--border-radius);
    padding: 1rem;
    margin-bottom: 1rem;
    border-left: 3px solid var(--color-3);
    transition: var(--transition);
}

.history-item:hover {
    background: rgba(255, 255, 255, 1);
    transform: translateX(3px);
    box-shadow: var(--shadow-sm);
}

.history-date {
    font-size: 0.8rem;
    color: var(--color-4);
    font-weight: 600;
}

.history-details {
    font-size: 0.9rem;
    color: #666;
    margin: 0.5rem 0;
}

.history-result {
    font-weight: bold;
    color: var(--color-5);
}

/* FAQ Styles */
.accordion-item {
    border: none;
    margin-bottom: 0.5rem;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.accordion-button {
    background: linear-gradient(135deg, rgba(248, 177, 149, 0.1), rgba(246, 114, 128, 0.1));
    border: none;
    font-weight: 600;
    color: var(--color-5);
    padding: 1rem 1.5rem;
}

.accordion-button:not(.collapsed) {
    background: var(--gradient-primary);
    color: white;
    box-shadow: none;
}

.accordion-button:focus {
    box-shadow: 0 0 0 0.2rem rgba(108, 91, 123, 0.25);
}

.accordion-body {
    background: rgba(255, 255, 255, 0.9);
    padding: 1.5rem;
}

/* Footer Styles */
.footer-gradient {
    background: var(--gradient-primary);
    margin-top: auto;
}

.footer-gradient a {
    text-decoration: none;
    transition: var(--transition);
}

.footer-gradient a:hover {
    text-decoration: underline;
    opacity: 0.8;
}

/* Ad Banner Styles */
.ad-banner {
    border: 2px dashed #dee2e6;
    border-radius: var(--border-radius);
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #6c757d;
    font-size: 0.9rem;
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.slide-in-right {
    animation: slideInRight 0.5s ease-out;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Loading Spinner */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .modal-body {
        padding: 1rem;
    }
    
    .result-value {
        font-size: 1.25rem;
    }
    
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
    
    .header-gradient h1 {
        font-size: 1.1rem;
    }
    
    .offcanvas {
        width: 90% !important;
    }
}

@media (max-width: 576px) {
    .result-item {
        padding: 1rem;
    }
    
    .result-value {
        font-size: 1.1rem;
    }
    
    .form-control,
    .form-select {
        padding: 0.5rem 0.75rem;
    }
    
    .card-header {
        padding: 0.75rem 1rem !important;
    }
    
    .modal-dialog {
        margin: 0.5rem;
    }
}

/* Print Styles */
@media print {
    .header-gradient,
    .modal,
    .offcanvas,
    .btn,
    .ad-banner,
    .footer-gradient {
        display: none !important;
    }
    
    .card {
        box-shadow: none !important;
        border: 1px solid #dee2e6 !important;
    }
    
    .bg-gradient {
        background: #f8f9fa !important;
        color: #333 !important;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --color-1: #000;
        --color-2: #333;
        --color-3: #666;
        --color-4: #999;
        --color-5: #000;
    }
    
    .form-control,
    .form-select {
        border-width: 3px;
    }
    
    .btn {
        border: 2px solid;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus Styles for Accessibility */
.form-control:focus,
.form-select:focus,
.btn:focus {
    outline: 3px solid rgba(108, 91, 123, 0.5);
    outline-offset: 2px;
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gradient-secondary);
}

/* Tooltip Styles */
.tooltip {
    font-size: 0.875rem;
}

.tooltip-inner {
    background: var(--color-5);
    border-radius: var(--border-radius);
    padding: 0.5rem 0.75rem;
}

/* Form Validation Styles */
.was-validated .form-control:valid,
.was-validated .form-select:valid {
    border-color: #28a745;
    box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.25);
}

.was-validated .form-control:invalid,
.was-validated .form-select:invalid {
    border-color: #dc3545;
    box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
}

.valid-feedback {
    color: #28a745;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.invalid-feedback {
    color: #dc3545;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

/* Utility Classes */
.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-glass {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.shadow-custom {
    box-shadow: var(--shadow-md);
}

.border-gradient {
    border: 2px solid transparent;
    background: linear-gradient(white, white) padding-box,
                var(--gradient-primary) border-box;
}