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

:root {
    /* Color Palette */
    --primary-color: #2196F3;
    --success-color: #4CAF50;
    --warning-color: #FFC107;
    --danger-color: #F44336;
    --purple-color: #9C27B0;
    
    /* Additional Colors */
    --light-bg: #f8f9fa;
    --dark-bg: #212529;
    --card-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --card-shadow-hover: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    
    /* Typography */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-base: 1rem;
    --line-height-base: 1.5;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --border-radius: 0.375rem;
    --border-radius-lg: 0.5rem;
    
    /* Transitions */
    --transition-base: all 0.3s ease;
    --transition-fast: all 0.15s ease;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --light-bg: #2d3748;
    --dark-bg: #1a202c;
    --bs-body-bg: #1a202c;
    --bs-body-color: #e2e8f0;
    --bs-card-bg: #2d3748;
    --bs-border-color: #4a5568;
    --text-muted: #a0aec0;
    --text-secondary: #cbd5e0;
}

/* Base Styles */
body {
    font-family: var(--font-family);
    line-height: var(--line-height-base);
    background-color: var(--light-bg);
    transition: var(--transition-base);
}

/* Typography Enhancements */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

/* Navigation Enhancements */
.navbar {
    backdrop-filter: blur(10px);
    box-shadow: var(--card-shadow);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.25rem;
}

.navbar-logo {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    transition: var(--transition-fast);
}

.navbar-logo:hover {
    transform: scale(1.1);
}

/* Card Enhancements */
.card {
    border: none;
    box-shadow: var(--card-shadow);
    transition: var(--transition-base);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
}

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

.card-summary {
    background: linear-gradient(135deg, var(--primary-color), #1976D2);
    border: none;
    color: white;
}

.card-summary.bg-warning {
    background: linear-gradient(135deg, var(--warning-color), #F57C00);
}

.card-summary.bg-danger {
    background: linear-gradient(135deg, var(--danger-color), #D32F2F);
}

.card-summary.bg-success {
    background: linear-gradient(135deg, var(--success-color), #388E3C);
}

.card-summary .card-body {
    padding: var(--spacing-lg);
}

/* Bill Card Styles */
.bill-card {
    transition: var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.bill-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-color);
    transition: var(--transition-fast);
}

.bill-card.category-utilities::before {
    background: var(--warning-color);
}

.bill-card.category-entertainment::before {
    background: var(--purple-color);
}

.bill-card.category-transport::before {
    background: var(--success-color);
}

.bill-card.category-health::before {
    background: var(--danger-color);
}

.bill-card.category-education::before {
    background: var(--primary-color);
}

.bill-card.category-other::before {
    background: #6c757d;
}

.bill-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-shadow-hover);
}

.bill-card.overdue {
    border-left: 4px solid var(--danger-color);
    background-color: rgba(244, 67, 54, 0.05);
}

.bill-card.upcoming {
    border-left: 4px solid var(--warning-color);
    background-color: rgba(255, 193, 7, 0.05);
}

/* Status Badges */
.status-badge {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 50px;
    font-weight: 500;
}

.status-active {
    background-color: rgba(76, 175, 80, 0.1);
    color: var(--success-color);
}

.status-suspended {
    background-color: rgba(255, 193, 7, 0.1);
    color: var(--warning-color);
}

.status-cancelled {
    background-color: rgba(244, 67, 54, 0.1);
    color: var(--danger-color);
}

/* Chart Container */
.chart-container {
    position: relative;
    padding: 20px;
}

#categoryChart {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.chart-legend {
    padding: 20px 0;
    max-height: 300px;
    overflow-y: auto;
}

/* Chart Legend Styles */
.chart-legend-item {
    padding: 8px 12px;
    border-radius: var(--border-radius);
    transition: var(--transition-fast);
    background: rgba(0, 0, 0, 0.02);
}

.chart-legend-item:hover {
    background: rgba(0, 0, 0, 0.05);
    transform: translateX(4px);
}

.legend-color {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: var(--transition-fast);
}

.chart-legend-item:hover .legend-color {
    transform: scale(1.1);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.legend-label {
    font-weight: 500;
    color: var(--bs-body-color);
}

.legend-value {
    font-weight: 600;
    color: var(--primary-color);
}

.legend-percentage {
    font-size: 0.75rem;
}

/* Dark mode chart legend */
[data-theme="dark"] .chart-legend-item {
    background: rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .chart-legend-item:hover {
    background: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .legend-label {
    color: var(--bs-body-color);
}

[data-theme="dark"] .legend-value {
    color: var(--primary-color);
}

/* Dark mode bill cards */
[data-theme="dark"] .bill-card {
    background-color: var(--light-bg);
    border-color: var(--bs-border-color);
}

[data-theme="dark"] .bill-card.overdue {
    background-color: rgba(220, 53, 69, 0.1);
    border-left-color: #dc3545;
}

[data-theme="dark"] .bill-card.upcoming {
    background-color: rgba(255, 193, 7, 0.1);
    border-left-color: #ffc107;
}

[data-theme="dark"] .status-badge {
    border: 1px solid var(--bs-border-color);
}

[data-theme="dark"] .status-active {
    background-color: rgba(25, 135, 84, 0.2);
    color: #86efac;
}

[data-theme="dark"] .status-suspended {
    background-color: rgba(255, 193, 7, 0.2);
    color: #fde047;
}

[data-theme="dark"] .status-cancelled {
    background-color: rgba(220, 53, 69, 0.2);
    color: #fca5a5;
}

/* Form Enhancements */
.form-control, .form-select {
    border-radius: var(--border-radius);
    border: 1px solid #dee2e6;
    transition: var(--transition-fast);
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(33, 150, 243, 0.25);
}

/* Button Enhancements */
.btn {
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition-base);
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #1976D2);
    border: none;
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color), #388E3C);
    border: none;
}

.btn-warning {
    background: linear-gradient(135deg, var(--warning-color), #F57C00);
    border: none;
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger-color), #D32F2F);
    border: none;
}

/* Modal Enhancements */
.modal-content {
    border: none;
    border-radius: var(--border-radius-lg);
    box-shadow: 0 1rem 3rem rgba(0, 0, 0, 0.175);
}

.modal-header {
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    padding: var(--spacing-lg);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-footer {
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    padding: var(--spacing-lg);
}

/* Offcanvas Enhancements */
.offcanvas {
    border: none;
    box-shadow: 0 0 2rem rgba(0, 0, 0, 0.1);
}

/* Alert Enhancements */
.alert {
    border: none;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    position: relative;
    overflow: hidden;
}

.alert::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: currentColor;
    opacity: 0.8;
}

.alert-dismissible .btn-close {
    position: absolute;
    top: 50%;
    right: var(--spacing-md);
    transform: translateY(-50%);
    opacity: 0.7;
    transition: var(--transition-fast);
}

.alert-dismissible .btn-close:hover {
    opacity: 1;
}

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

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

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

.animate-slide-up {
    animation: slideInUp 0.5s ease-out;
}

.animate-fade-in {
    animation: fadeIn 0.3s ease-in;
}

.animate-pulse {
    animation: pulse 2s infinite;
}

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

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid transparent;
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    color: #6c757d;
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}


/* Tips Section */
.tip-item {
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    background: rgba(33, 150, 243, 0.05);
    border-left: 4px solid var(--primary-color);
    margin-bottom: var(--spacing-md);
    transition: var(--transition-base);
}

.tip-item:hover {
    background: rgba(33, 150, 243, 0.1);
    transform: translateX(4px);
}

/* Category Filters */
.category-filter {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    transition: var(--transition-fast);
    cursor: pointer;
    margin-bottom: var(--spacing-xs);
}

.category-filter:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

.category-filter.active {
    background-color: var(--primary-color);
    color: white;
}

/* Dark Mode Styles */
[data-theme="dark"] {
    background-color: var(--dark-bg);
    color: var(--bs-body-color);
}

[data-theme="dark"] .card {
    background-color: var(--light-bg);
    color: var(--bs-body-color);
    border-color: var(--bs-border-color);
}

[data-theme="dark"] .modal-content {
    background-color: var(--light-bg);
    color: var(--bs-body-color);
    border-color: var(--bs-border-color);
}

[data-theme="dark"] .offcanvas {
    background-color: var(--light-bg);
    color: var(--bs-body-color);
}

[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select {
    background-color: var(--dark-bg);
    border-color: var(--bs-border-color);
    color: var(--bs-body-color);
}

[data-theme="dark"] .form-control:focus,
[data-theme="dark"] .form-select:focus {
    background-color: var(--dark-bg);
    border-color: var(--primary-color);
    color: var(--bs-body-color);
    box-shadow: 0 0 0 0.2rem rgba(33, 150, 243, 0.25);
}

[data-theme="dark"] .text-muted {
    color: var(--text-muted) !important;
}

[data-theme="dark"] .text-secondary {
    color: var(--text-secondary) !important;
}

[data-theme="dark"] .tip-item {
    background-color: rgba(33, 150, 243, 0.15);
    border-left-color: var(--primary-color);
}

[data-theme="dark"] .category-filter:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .alert {
    border-color: var(--bs-border-color);
}

[data-theme="dark"] .alert-info {
    background-color: rgba(13, 202, 240, 0.1);
    border-color: rgba(13, 202, 240, 0.2);
    color: #7dd3fc;
}

[data-theme="dark"] .alert-success {
    background-color: rgba(25, 135, 84, 0.1);
    border-color: rgba(25, 135, 84, 0.2);
    color: #86efac;
}

[data-theme="dark"] .alert-warning {
    background-color: rgba(255, 193, 7, 0.1);
    border-color: rgba(255, 193, 7, 0.2);
    color: #fde047;
}

[data-theme="dark"] .alert-danger {
    background-color: rgba(220, 53, 69, 0.1);
    border-color: rgba(220, 53, 69, 0.2);
    color: #fca5a5;
}

/* Dark mode summary cards */
[data-theme="dark"] .card-summary {
    background: linear-gradient(135deg, var(--primary-color), #1976D2) !important;
    color: white !important;
}

[data-theme="dark"] .card-summary.bg-warning {
    background: linear-gradient(135deg, #f59e0b, #d97706) !important;
    color: white !important;
}

[data-theme="dark"] .card-summary.bg-danger {
    background: linear-gradient(135deg, #dc2626, #b91c1c) !important;
    color: white !important;
}

[data-theme="dark"] .card-summary.bg-success {
    background: linear-gradient(135deg, #059669, #047857) !important;
    color: white !important;
}

/* Dark mode navigation */
[data-theme="dark"] .navbar {
    background-color: var(--primary-color) !important;
    border-bottom: 1px solid var(--bs-border-color);
}

/* Dark mode buttons */
[data-theme="dark"] .btn-outline-light {
    border-color: rgba(255, 255, 255, 0.3);
    color: rgba(255, 255, 255, 0.9);
}

[data-theme="dark"] .btn-outline-light:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
    color: white;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding-left: var(--spacing-md);
        padding-right: var(--spacing-md);
    }
    
    .card-body {
        padding: var(--spacing-md);
    }
    
    .modal-dialog {
        margin: var(--spacing-md);
    }
    
    .offcanvas {
        width: 280px;
    }
    
    h1 {
        font-size: 1.75rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .card-summary .card-body {
        padding: var(--spacing-md);
    }
    
    .bill-card {
        margin-bottom: var(--spacing-md);
    }
}

@media (max-width: 576px) {
    .container {
        padding-left: var(--spacing-sm);
        padding-right: var(--spacing-sm);
    }
    
    .btn {
        font-size: 0.875rem;
        padding: 0.5rem 0.75rem;
    }
    
    .card-summary h3 {
        font-size: 1.5rem;
    }
    
    .navbar-brand {
        font-size: 1.1rem;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .offcanvas,
    .modal,
    .btn,
    
    .container {
        max-width: none;
        padding: 0;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #dee2e6;
        break-inside: avoid;
    }
    
    body {
        background: white;
        color: black;
        font-size: 12pt;
        line-height: 1.4;
    }
    
    h1, h2, h3, h4, h5, h6 {
        color: black;
        page-break-after: avoid;
    }
}

/* Accessibility Enhancements */
.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-select:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    .card {
        border: 2px solid currentColor;
    }
    
    .btn {
        border: 2px solid currentColor;
    }
}

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

/* Footer Styles */
footer {
    background: #212529 !important;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

footer h6 {
    color: #ffffff;
    font-weight: 600;
}

footer .text-muted {
    color: #adb5bd !important;
}

footer a {
    transition: var(--transition-fast);
}

footer a:hover {
    color: var(--primary-color) !important;
    text-decoration: underline !important;
}

.footer-logo {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    transition: var(--transition-fast);
}

.footer-logo:hover {
    transform: scale(1.1);
}

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

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

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

::-webkit-scrollbar-thumb:hover {
    background: #1976D2;
}

[data-theme="dark"] ::-webkit-scrollbar-track {
    background: var(--dark-bg);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
    background: var(--primary-color);
}