/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-primary: #F6DFEB;
    --color-secondary: #E4C1F9;
    --color-accent: #D0F4DE;
    --color-highlight: #FCF6BD;
    --color-pink: #FFB7C5;
    --color-dark: #2c3e50;
    --color-light: #ffffff;
    --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 8px 30px rgba(0, 0, 0, 0.2);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--color-dark);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 50%, var(--color-accent) 100%);
    min-height: 100vh;
}

/* Gradient Backgrounds */
.header-gradient {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: var(--shadow-medium);
}

.footer-gradient {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    margin-top: auto;
}

.bg-gradient {
    background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-pink) 100%);
}

/* Cards */
.calculator-card {
    border-radius: var(--border-radius);
    overflow: hidden;
    background: var(--color-light);
    transition: var(--transition);
}

.calculator-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-heavy);
}

.results-card {
    border-radius: var(--border-radius);
    overflow: hidden;
    background: var(--color-light);
    animation: slideInUp 0.5s ease-out;
}

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

/* Form Styles */
.form-control {
    border-radius: 8px;
    border: 2px solid #e9ecef;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    border-color: var(--color-secondary);
    box-shadow: 0 0 0 0.2rem rgba(228, 193, 249, 0.25);
}

.form-control.is-invalid {
    border-color: #dc3545;
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.form-select {
    border-radius: 8px;
    border: 2px solid #e9ecef;
    padding: 0.75rem 1rem;
    transition: var(--transition);
}

.form-select:focus {
    border-color: var(--color-secondary);
    box-shadow: 0 0 0 0.2rem rgba(228, 193, 249, 0.25);
}

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

.form-check-input:checked {
    background-color: var(--color-secondary);
    border-color: var(--color-secondary);
}

/* Buttons */
.btn {
    border-radius: 8px;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: var(--transition);
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-pink) 100%);
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-pink) 0%, var(--color-secondary) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

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

.btn-outline-primary:hover {
    background: var(--color-secondary);
    color: white;
    transform: translateY(-2px);
}

.btn-outline-light {
    border: 2px solid rgba(255, 255, 255, 0.5);
    color: white;
}

.btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: white;
    color: white;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* Input Groups */
.input-group-text {
    background: var(--color-primary);
    border: 2px solid #e9ecef;
    border-right: none;
    color: var(--color-dark);
    font-weight: 600;
}

/* Results Section */
.result-item {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-highlight) 100%);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.result-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.result-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-dark);
}

.result-label {
    font-size: 0.9rem;
    color: #6c757d;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.total-result {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    color: white;
    font-size: 1.8rem;
    font-weight: 800;
    text-align: center;
    padding: 2rem;
    border-radius: var(--border-radius);
    margin: 1.5rem 0;
    box-shadow: var(--shadow-medium);
}

/* Accordion */
.accordion-item {
    border: none;
    margin-bottom: 1rem;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-light);
}

.accordion-button {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: var(--color-dark);
    font-weight: 600;
    border: none;
    padding: 1.25rem 1.5rem;
}

.accordion-button:not(.collapsed) {
    background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-pink) 100%);
    color: white;
    box-shadow: none;
}

.accordion-button:focus {
    box-shadow: none;
    border: none;
}

.accordion-body {
    background: var(--color-light);
    padding: 1.5rem;
}

/* Modal */
.modal-content {
    border-radius: var(--border-radius);
    border: none;
    box-shadow: var(--shadow-heavy);
}

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

.modal-body {
    padding: 1.5rem;
}

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

/* Offcanvas */
.offcanvas {
    border-radius: var(--border-radius) 0 0 var(--border-radius);
    box-shadow: var(--shadow-heavy);
}

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

.offcanvas-body {
    padding: 1.5rem;
}

/* History Items */
.history-item {
    background: var(--color-light);
    border-radius: var(--border-radius);
    padding: 1rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    cursor: pointer;
}

.history-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.history-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.history-item-name {
    font-weight: 600;
    color: var(--color-dark);
}

.history-item-date {
    font-size: 0.8rem;
    color: #6c757d;
}

.history-item-details {
    font-size: 0.9rem;
    color: #6c757d;
}

.history-item-value {
    font-weight: 600;
    color: #28a745;
}

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

.tooltip-inner {
    background: var(--color-dark);
    color: white;
    border-radius: 6px;
    padding: 0.5rem 0.75rem;
    max-width: 250px;
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    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: 1.5rem !important;
    }
    
    .btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.9rem;
    }
    
    .btn-lg {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
    }
    
    .result-value {
        font-size: 1.2rem;
    }
    
    .total-result {
        font-size: 1.5rem;
        padding: 1.5rem;
    }
    
    .header-gradient .col-md-4 {
        text-align: center !important;
        margin-top: 1rem;
    }
    
    .d-flex.gap-2 {
        flex-direction: column;
    }
    
    .d-flex.gap-2 .btn {
        margin-bottom: 0.5rem;
    }
}

@media (max-width: 576px) {
    .card-header h2,
    .card-header h3 {
        font-size: 1.2rem;
    }
    
    .form-control,
    .form-select {
        font-size: 0.9rem;
        padding: 0.6rem 0.8rem;
    }
    
    .accordion-button {
        font-size: 0.9rem;
        padding: 1rem;
    }
    
    .offcanvas {
        width: 100% !important;
        border-radius: 0;
    }
    
    .modal-lg {
        max-width: 95%;
    }
}

/* Print Styles */
@media print {
    body {
        background: white !important;
    }
    
    .header-gradient,
    .footer-gradient,
    .btn,
    .offcanvas,
    .modal {
        display: none !important;
    }
    
    .card {
        box-shadow: none !important;
        border: 1px solid #dee2e6 !important;
    }
    
    .result-item {
        background: #f8f9fa !important;
        box-shadow: none !important;
    }
    
    .total-result {
        background: #28a745 !important;
        color: white !important;
    }
}

/* Accessibility */
.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;
}

/* Focus indicators */
.btn:focus,
.form-control:focus,
.form-select:focus {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-primary: #000000;
        --color-secondary: #ffffff;
        --color-accent: #ffff00;
        --color-highlight: #ff0000;
        --color-pink: #ff00ff;
    }
}

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

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --color-dark: #ffffff;
        --color-light: #2c3e50;
    }
    
    body {
        background: linear-gradient(135deg, #2c3e50 0%, #34495e 50%, #2c3e50 100%);
        color: white;
    }
    
    .card {
        background: #34495e !important;
        color: white;
    }
    
    .form-control,
    .form-select {
        background: #2c3e50;
        color: white;
        border-color: #495057;
    }
    
    .form-control:focus,
    .form-select:focus {
        background: #2c3e50;
        color: white;
    }
}

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

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

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

::-webkit-scrollbar-thumb:hover {
    background: var(--color-pink);
}

/* Utility Classes */
.text-gradient {
    background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-pink) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-soft {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.border-gradient {
    border: 2px solid;
    border-image: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-pink) 100%) 1;
}

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

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

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

/* Error states */
.error-message {
    background: linear-gradient(135deg, #dc3545 0%, #c82333 100%);
    color: white;
    padding: 1rem;
    border-radius: var(--border-radius);
    margin: 1rem 0;
    box-shadow: var(--shadow-light);
}

.success-message {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    color: white;
    padding: 1rem;
    border-radius: var(--border-radius);
    margin: 1rem 0;
    box-shadow: var(--shadow-light);
}

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

.btn-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 16px;
    margin: -8px 0 0 -8px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Form validation styles */
.was-validated .form-control:valid {
    border-color: #28a745;
}

.was-validated .form-control:invalid {
    border-color: #dc3545;
}

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

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