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

:root {
    /* Color Palette */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;

    /* Neutral Colors */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body {
    font-family: var(--font-sans);
    background-color: var(--gray-50);
    color: var(--gray-900);
    line-height: 1.6;
    min-height: 100vh;
}

/* Login Page Styles */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: var(--spacing-md);
}

.login-box {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.login-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    color: var(--primary-color);
}

.login-header h1 {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.login-header p {
    color: var(--gray-500);
    font-size: 0.875rem;
}

.login-form {
    margin-top: var(--spacing-lg);
}

/* Navigation Styles */
.navbar {
    background: white;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    text-decoration: none;
}

.nav-brand svg {
    width: 28px;
    height: 28px;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    color: var(--gray-600);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all 0.2s;
}

.nav-link:hover {
    color: var(--primary-color);
    background-color: var(--gray-50);
}

.nav-link.active {
    color: var(--primary-color);
    background-color: var(--primary-color);
    background-color: rgba(99, 102, 241, 0.1);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* Page Header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.page-header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
}

.header-actions {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.back-link {
    display: inline-flex;
    align-items: center;
    color: var(--gray-600);
    text-decoration: none;
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
    transition: color 0.2s;
}

.back-link:hover {
    color: var(--primary-color);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    gap: var(--spacing-sm);
}

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

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

.btn-secondary {
    background-color: var(--gray-200);
    color: var(--gray-700);
}

.btn-secondary:hover {
    background-color: var(--gray-300);
}

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

.btn-danger:hover {
    background-color: #dc2626;
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

.btn-block {
    width: 100%;
}

/* Forms */
.form-container {
    max-width: 600px;
    margin: 0 auto;
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.expense-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-group label {
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.875rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    transition: all 0.2s;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group textarea {
    resize: vertical;
}

.form-help {
    font-size: 0.8125rem;
    color: var(--gray-500);
}

.form-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    margin-top: var(--spacing-md);
}

.current-receipt {
    padding: var(--spacing-sm);
    background-color: var(--gray-50);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
}

.current-receipt a {
    color: var(--primary-color);
}

/* Alerts */
.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    font-size: 0.875rem;
}

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #6ee7b7;
}

.alert-error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #fca5a5;
}

/* Stats Card */
.stats-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-xl);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-500);
    font-weight: 500;
}

.stat-value {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--gray-900);
}

/* Empty State */
.empty-state {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.empty-state svg {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    color: var(--gray-300);
}

.empty-state h3 {
    font-size: 1.25rem;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.empty-state p {
    color: var(--gray-500);
    margin-bottom: var(--spacing-lg);
}

/* Expense Day Card */
.expenses-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.expense-day-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.2s;
}

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

.day-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.day-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.day-date {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--gray-900);
}

.day-weekday {
    font-size: 0.875rem;
    color: var(--gray-500);
}

.day-total {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: var(--spacing-xs);
}

.records-count {
    font-size: 0.8125rem;
    color: var(--gray-500);
}

.total-amount {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.view-details-btn {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.875rem;
    transition: color 0.2s;
}

.view-details-btn:hover {
    color: var(--primary-dark);
}

/* Expense Items */
.expense-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.expense-item {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.expense-main {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex: 1;
}

.expense-type-badge {
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    font-weight: 600;
    white-space: nowrap;
}

.badge-grocery {
    background-color: #d1fae5;
    color: #065f46;
}

.badge-medical {
    background-color: #fee2e2;
    color: #991b1b;
}

.badge-transport {
    background-color: #dbeafe;
    color: #1e40af;
}

.badge-entertainment {
    background-color: #fce7f3;
    color: #9f1239;
}

.badge-food {
    background-color: #fed7aa;
    color: #92400e;
}

.badge-shopping {
    background-color: #e9d5ff;
    color: #6b21a8;
}

.badge-education {
    background-color: #cffafe;
    color: #155e75;
}

.badge-other {
    background-color: var(--gray-200);
    color: var(--gray-700);
}

.expense-details {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.expense-amount {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
}

.expense-comments {
    font-size: 0.875rem;
    color: var(--gray-600);
}

.receipt-link {
    font-size: 0.8125rem;
    color: var(--primary-color);
    text-decoration: none;
}

.receipt-link:hover {
    text-decoration: underline;
}

.expense-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* Month Picker */
.month-picker {
    padding: 0.5rem 0.875rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
}

.month-picker:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Bills Section */
.bills-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.bill-type-section {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.bill-type-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--gray-100);
}

.bill-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-900);
}

.bill-date-info {
    font-size: 0.8125rem;
    color: var(--gray-500);
}

/* Reports */
.report-summary {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-xl);
}

.report-summary h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-lg);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.stat-card {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    border: 2px solid var(--gray-100);
}

.stat-card.grand-total {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    border: none;
}

.stat-card.grand-total .stat-label,
.stat-card.grand-total .stat-value {
    color: white;
}

.stat-card.grand-total .stat-icon svg {
    color: white;
}

.stat-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-icon svg {
    width: 40px;
    height: 40px;
}

.daily-icon svg {
    color: var(--success-color);
}

.bills-icon svg {
    color: var(--warning-color);
}

.total-icon svg {
    color: var(--primary-color);
}

.stat-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.report-section {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-xl);
}

.report-section h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-lg);
}

.empty-message {
    text-align: center;
    color: var(--gray-500);
    padding: var(--spacing-xl);
}

/* Tables */
.breakdown-table {
    overflow-x: auto;
}

.breakdown-table table {
    width: 100%;
    border-collapse: collapse;
}

.breakdown-table th,
.breakdown-table td {
    padding: var(--spacing-md);
    text-align: left;
}

.breakdown-table thead {
    background-color: var(--gray-50);
    border-bottom: 2px solid var(--gray-200);
}

.breakdown-table th {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--gray-700);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.breakdown-table tbody tr {
    border-bottom: 1px solid var(--gray-100);
}

.breakdown-table tbody tr:hover {
    background-color: var(--gray-50);
}

.breakdown-table .total-row {
    background-color: var(--gray-50);
    font-weight: 600;
}

.type-badge {
    display: inline-block;
    padding: 0.25rem 0.625rem;
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
    font-weight: 600;
    background-color: var(--gray-200);
    color: var(--gray-700);
}

.percentage-bar {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    min-width: 200px;
}

.percentage-fill {
    height: 8px;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--primary-light) 100%);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.percentage-text {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--gray-700);
    min-width: 45px;
}

/* Timeline Chart */
.timeline-chart {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.timeline-item {
    display: grid;
    grid-template-columns: 80px 1fr 120px;
    gap: var(--spacing-md);
    align-items: center;
}

.timeline-date {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
}

.timeline-bar-container {
    background-color: var(--gray-100);
    border-radius: 4px;
    height: 8px;
    overflow: hidden;
}

.timeline-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--success-color) 0%, #34d399 100%);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.timeline-amount {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--gray-900);
    text-align: right;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .nav-menu {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .header-actions {
        width: 100%;
        flex-wrap: wrap;
    }

    .stats-card {
        grid-template-columns: 1fr;
    }

    .expense-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .expense-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .form-actions {
        flex-direction: column-reverse;
    }

    .form-actions .btn {
        width: 100%;
    }

    .timeline-item {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

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

    .breakdown-table {
        font-size: 0.875rem;
    }

    .breakdown-table th,
    .breakdown-table td {
        padding: var(--spacing-sm);
    }
}

/* Print Styles */
@media print {
    .navbar,
    .header-actions,
    .expense-actions,
    .btn {
        display: none !important;
    }

    body {
        background: white;
    }

    .container {
        max-width: 100%;
    }
}