/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    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) 0%, var(--color-4) 50%, var(--color-3) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--color-3) 0%, var(--color-2) 50%, var(--color-1) 100%);
    --gradient-accent: linear-gradient(45deg, var(--color-2) 0%, var(--color-1) 100%);
    
    --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: #333;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
}

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

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
}

.navbar-nav .btn {
    border-radius: 20px;
    padding: 0.5rem 1rem;
    transition: var(--transition);
}

.navbar-nav .btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

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

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

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

.card-body {
    padding: 2rem;
}

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

.form-label-sm {
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
}

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

.form-control:focus,
.form-select:focus {
    border-color: var(--color-3);
    box-shadow: 0 0 0 0.2rem rgba(192, 108, 132, 0.25);
}

.input-group-text {
    background: var(--gradient-accent);
    color: white;
    border: none;
    font-weight: 600;
}

.form-check-input:checked {
    background-color: var(--color-3);
    border-color: var(--color-3);
}

/* Button Styles */
.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: var(--gradient-primary);
    color: white;
}

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

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

.btn-success:hover {
    background: linear-gradient(45deg, var(--color-3) 0%, var(--color-2) 100%);
    transform: translateY(-2px);
}

.btn-outline-primary {
    border: 2px solid var(--color-3);
    color: var(--color-3);
}

.btn-outline-primary:hover {
    background: var(--color-3);
    border-color: var(--color-3);
    color: white;
}

.btn-outline-secondary {
    border: 2px solid var(--color-4);
    color: var(--color-4);
}

.btn-outline-secondary:hover {
    background: var(--color-4);
    border-color: var(--color-4);
    color: white;
}

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

/* Result Styles */
.result-card {
    animation: slideInUp 0.5s ease-out;
}

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

.result-item {
    background: linear-gradient(135deg, #fff 0%, #f8f9fa 100%);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    border-left: 4px solid var(--color-3);
    transition: var(--transition);
}

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

.result-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-5);
}

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

.result-negative {
    color: #dc3545;
}

.result-summary {
    background: var(--gradient-accent);
    color: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    text-align: center;
    margin: 1.5rem 0;
}

.result-summary h4 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

/* Info Cards */
.info-card {
    background: linear-gradient(135deg, #fff 0%, #f8f9fa 100%);
    border: none;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

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

.info-card .card-body {
    padding: 1.5rem;
}

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

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

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

.modal-header.bg-primary {
    background: var(--color-5) !important;
}

.modal-header.bg-success {
    background: var(--color-3) !important;
}

.accordion-button {
    background: linear-gradient(135deg, #fff 0%, #f8f9fa 100%);
    border: none;
    color: var(--color-5);
    font-weight: 600;
}

.accordion-button:not(.collapsed) {
    background: var(--gradient-accent);
    color: white;
}

.accordion-button:focus {
    box-shadow: 0 0 0 0.2rem rgba(192, 108, 132, 0.25);
}

/* Offcanvas Styles */
.offcanvas-header.bg-gradient {
    background: var(--gradient-primary) !important;
}

.history-item {
    background: linear-gradient(135deg, #fff 0%, #f8f9fa 100%);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    border-left: 4px solid var(--color-2);
    transition: var(--transition);
}

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

.history-date {
    font-size: 0.875rem;
    color: #6c757d;
    font-weight: 500;
}

.history-values {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
}

.history-gross {
    color: var(--color-5);
    font-weight: 600;
}

.history-net {
    color: var(--color-3);
    font-weight: 700;
}

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

.social-links a {
    transition: var(--transition);
}

.social-links a:hover {
    transform: translateY(-3px);
    opacity: 0.8;
}

/* Ad Banner Styles */
.ad-banner {
    border: 2px dashed #dee2e6;
    border-radius: var(--border-radius);
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Table Styles */
.table {
    margin-bottom: 0;
}

.table th {
    background: var(--gradient-accent);
    color: white;
    border: none;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 0.5px;
}

.table td {
    border-color: #e9ecef;
    padding: 0.75rem;
    vertical-align: middle;
}

.table-striped tbody tr:nth-of-type(odd) {
    background: linear-gradient(135deg, #fff 0%, #f8f9fa 100%);
}

/* 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: #fff;
    animation: spin 1s ease-in-out infinite;
}

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

/* Validation Styles */
.is-invalid {
    border-color: #dc3545;
}

.is-valid {
    border-color: #28a745;
}

.invalid-feedback {
    display: block;
    width: 100%;
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: #dc3545;
}

.valid-feedback {
    display: block;
    width: 100%;
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: #28a745;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .card-body {
        padding: 1.5rem;
    }
    
    .navbar-brand {
        font-size: 1.25rem;
    }
    
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
    
    .btn-lg {
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
    }
    
    .result-summary h4 {
        font-size: 1.5rem;
    }
    
    .modal-dialog {
        margin: 1rem;
    }
    
    .offcanvas {
        width: 100% !important;
    }
    
    .history-values {
        flex-direction: column;
        gap: 0.25rem;
    }
    
    .ad-banner {
        min-height: 100px;
    }
}

@media (max-width: 576px) {
    .card-header {
        padding: 1rem !important;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .btn {
        font-size: 0.875rem;
        padding: 0.5rem 1rem;
    }
    
    .form-control,
    .form-select {
        padding: 0.5rem;
        font-size: 0.9rem;
    }
    
    .result-item {
        padding: 0.75rem;
    }
    
    .result-value {
        font-size: 1.1rem;
    }
    
    .table-responsive {
        font-size: 0.875rem;
    }
    
    .navbar-nav .btn {
        margin: 0.25rem 0;
        padding: 0.5rem 1rem;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .btn,
    .ad-banner,
    .footer-gradient {
        display: none !important;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    .result-card {
        page-break-inside: avoid;
    }
    
    body {
        background: white;
    }
}

/* Accessibility Improvements */
.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 Styles */
.btn:focus,
.form-control:focus,
.form-check-input:focus {
    outline: 2px solid var(--color-3);
    outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --color-1: #000;
        --color-2: #333;
        --color-3: #666;
        --color-4: #999;
        --color-5: #000;
    }
}

/* 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) {
    body {
        background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
        color: #fff;
    }
    
    .card {
        background: #2d2d2d;
        color: #fff;
    }
    
    .form-control {
        background: #3d3d3d;
        border-color: #555;
        color: #fff;
    }
    
    .form-control:focus {
        background: #3d3d3d;
        border-color: var(--color-3);
        color: #fff;
    }
    
    .table {
        color: #fff;
    }
    
    .table td {
        border-color: #555;
    }
    
    .modal-content {
        background: #2d2d2d;
        color: #fff;
    }
    
    .offcanvas {
        background: #2d2d2d;
        color: #fff;
    }
}

/* 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);
}

/* 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(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

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

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

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

/* Loading State */
.btn.loading {
    position: relative;
    color: transparent;
}

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

/* Error States */
.error-message {
    background: linear-gradient(135deg, #f8d7da 0%, #f5c6cb 100%);
    color: #721c24;
    padding: 1rem;
    border-radius: var(--border-radius);
    border-left: 4px solid #dc3545;
    margin: 1rem 0;
}

.success-message {
    background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
    color: #155724;
    padding: 1rem;
    border-radius: var(--border-radius);
    border-left: 4px solid #28a745;
    margin: 1rem 0;
}

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

.tooltip-inner {
    background: var(--gradient-primary);
    border-radius: 6px;
    padding: 0.5rem 0.75rem;
}

.bs-tooltip-top .tooltip-arrow::before {
    border-top-color: var(--color-5);
}

.bs-tooltip-bottom .tooltip-arrow::before {
    border-bottom-color: var(--color-5);
}

.bs-tooltip-start .tooltip-arrow::before {
    border-left-color: var(--color-5);
}

.bs-tooltip-end .tooltip-arrow::before {
    border-right-color: var(--color-5);
}