:root {
    /* Colors */
    --primary-color: #0052cc;
    --primary-dark: #0747a6;
    --primary-light: #4c9aff;
    --secondary-color: #00875a;
    --secondary-dark: #006644;
    --accent-color: #ffAB00;
    --danger-color: #de350b;
    --warning-color: #ff991f;
    --info-color: #42526e;

    --text-color: #172b4d;
    --text-secondary: #5e6c84;
    --text-light: #ffffff;

    --bg-body: #f4f5f7;
    --bg-card: #ffffff;
    --bg-sidebar: #091e42;

    --border-color: #dfe1e6;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(9, 30, 66, 0.25);
    --shadow-md: 0 4px 8px rgba(9, 30, 66, 0.25), 0 0 1px rgba(9, 30, 66, 0.31);
    --shadow-lg: 0 8px 16px rgba(9, 30, 66, 0.25), 0 0 1px rgba(9, 30, 66, 0.31);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

[data-theme="dark"] {
    --primary-color: #4c9aff;
    --primary-dark: #2684ff;
    /* Lighter hover state for dark mode */
    --text-color: #ebecf0;
    --text-secondary: #b3bac5;
    --bg-body: #172b4d;
    --bg-card: #253858;
    --bg-sidebar: #0c1c35;
    --border-color: #42526e;

    /* Input backgrounds for dark mode */
    --accent-color: #ffAB00;
}

[data-theme="dark"] input,
[data-theme="dark"] select,
[data-theme="dark"] textarea {
    background-color: #1b2a4e;
    color: #fff;
    border-color: #42526e;
}

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

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
    background-color: var(--bg-body);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

/* Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

.main-content {
    flex: 1;
    padding: var(--spacing-lg);
    overflow-y: auto;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--bg-sidebar);
    color: var(--text-light);
    display: flex;
    flex-direction: column;
    padding: var(--spacing-lg) 0;
    flex-shrink: 0;
    transition: transform var(--transition-normal);
}

.logo {
    font-size: 1.2rem;
    font-weight: bold;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding: 0 var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.logo i {
    color: var(--primary-light);
}

.nav-links {
    flex: 1;
}

.nav-links li a {
    display: flex;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    color: #b3bac5;
    transition: all var(--transition-fast);
    font-weight: 500;
}

.nav-links li a:hover,
.nav-links li a.active {
    color: var(--text-light);
    background-color: rgba(255, 255, 255, 0.1);
    border-left: 4px solid var(--primary-light);
}

.nav-links li a i {
    margin-right: var(--spacing-md);
    width: 20px;
    text-align: center;
}

/* Components */
.card {
    background-color: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    transition: box-shadow var(--transition-fast);
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
    font-size: 0.95rem;
}

.btn:active {
    transform: scale(0.98);
}

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

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

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

.btn-secondary:hover {
    background-color: rgba(0, 82, 204, 0.1);
}

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

.btn-block {
    display: block;
    width: 100%;
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing-md);
}

label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

input,
select,
textarea {
    width: 100%;
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: var(--bg-body);
    color: var(--text-color);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Utilities */
.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.mt-1 {
    margin-top: var(--spacing-sm);
}

.mt-2 {
    margin-top: var(--spacing-md);
}

.mb-1 {
    margin-bottom: var(--spacing-sm);
}

.mb-2 {
    margin-bottom: var(--spacing-md);
}

.flex {
    display: flex;
}

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.gap-1 {
    gap: var(--spacing-md);
}

/* Dashboard Specifics */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.stat-card {
    display: flex;
    align-items: center;
    padding: var(--spacing-lg);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: rgba(0, 82, 204, 0.1);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-right: var(--spacing-md);
}

.stat-info h3 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.stat-info p {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-color);
}

/* Charts Container */
.charts-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    align-items: start;
}

.chart-wrapper {
    position: relative;
    height: 300px;
    width: 100%;
}

.table-scrollable {
    max-height: 300px;
    overflow-y: auto;
}

/* List/Table */
.transaction-list {
    width: 100%;
    border-collapse: collapse;
}

.transaction-list th,
.transaction-list td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.transaction-list th {
    color: var(--text-secondary);
    font-weight: 600;
}

.status-badge {
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}

.status-income {
    background-color: rgba(0, 135, 90, 0.1);
    color: var(--secondary-color);
}

.status-expense {
    background-color: rgba(222, 53, 11, 0.1);
    color: var(--danger-color);
}

/* Header/Top Bar (Mobile mostly, but useful for user profile) */
.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.avatar {
    width: 36px;
    height: 36px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

/* Notifications */
.notification {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 15px 25px;
    border-radius: 4px;
    color: white;
    font-weight: 500;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transform: translateY(100px);
    transition: transform 0.3s ease;
    z-index: 1000;
}

.notification.show {
    transform: translateY(0);
}

.notification.success {
    background-color: var(--secondary-color);
}

.notification.error {
    background-color: var(--danger-color);
}

/* Responsive */
@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        padding: var(--spacing-sm);
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }

    .nav-links {
        display: none;
        /* Add hamburger menu logic */
    }

    .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        background-color: var(--bg-sidebar);
        padding: var(--spacing-md);
        z-index: 100;
    }

    .main-content {
        height: auto;
    }
}