/* CSS Variables for easy tweaking */
:root {
    --sidebar-width: 250px;
    --navbar-height: 60px;
    --primary-color: #3498db; /* Calm blue */
    --secondary-color: #2c3e50; /* Darker blue/gray */
    --accent-color: #e74c3c; /* Red for warnings/accents */
    --text-color: #333;
    --background-color: #f8f8f8;
    --card-background: #ffffff;
    --border-color: #ddd;
    --shadow-light: rgba(0, 0, 0, 0.1);
    --spacing-unit: 15px;
    --border-radius: 8px;
    --transition-speed: 0.3s ease;

    /* Dark Mode Variables */
    --dark-mode-text-color: #f0f0f0;
    --dark-mode-background-color: #2c3e50;
    --dark-mode-card-background: #34495e;
    --dark-mode-border-color: #555;
    --dark-mode-shadow-light: rgba(255, 255, 255, 0.1);
}

/* Base Styles */
body {
    font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color var(--transition-speed), color var(--transition-speed);
    overflow: hidden; /* Prevent body scroll */
}

/* Dark Mode */
body.dark-mode {
    background-color: var(--dark-mode-background-color);
    color: var(--dark-mode-text-color);
}

body.dark-mode .sidebar {
    background-color: var(--dark-mode-card-background);
    box-shadow: 2px 0 10px var(--dark-mode-shadow-light);
}

body.dark-mode .top-navbar {
    background-color: var(--dark-mode-card-background);
    box-shadow: 0 2px 10px var(--dark-mode-shadow-light);
    border-bottom: 1px solid var(--dark-mode-border-color);
}

body.dark-mode .main-content {
    background-color: var(--dark-mode-background-color);
}

body.dark-mode .content-section {
    background-color: var(--dark-mode-card-background);
    box-shadow: 0 4px 15px var(--dark-mode-shadow-light);
    border: 1px solid var(--dark-mode-border-color);
}

body.dark-mode input,
body.dark-mode select,
body.dark-mode button {
    background-color: var(--dark-mode-background-color);
    color: var(--dark-mode-text-color);
    border: 1px solid var(--dark-mode-border-color);
}

body.dark-mode button:hover {
    background-color: var(--secondary-color); /* Slightly lighter in dark mode hover */
}

body.dark-mode table,
body.dark-mode th,
body.dark-mode td {
    border-color: var(--dark-mode-border-color);
}

body.dark-mode table thead th {
    background-color: var(--secondary-color);
}

body.dark-mode table tbody tr:nth-child(even) {
    background-color: var(--dark-mode-background-color);
}

/* App Container (CSS Grid) */
.app-container {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    grid-template-rows: var(--navbar-height) 1fr;
    height: 100vh; /* Full viewport height */
    width: 100vw;  /* Full viewport width */
    overflow: hidden; /* Ensure no scroll */
    position: relative; /* For small screen message overlay */
}

/* Sidebar */
.sidebar {
    grid-area: 1 / 1 / 3 / 2; /* Spans rows 1 and 2, column 1 */
    background-color: var(--card-background);
    box-shadow: 2px 0 10px var(--shadow-light);
    padding: var(--spacing-unit);
    display: flex;
    flex-direction: column;
    justify-content: space-between; /* Pushes toggle to bottom */
    border-right: 1px solid var(--border-color);
}

.sidebar nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar nav ul li {
    margin-bottom: 10px;
}

.sidebar nav ul li a {
    display: flex;
    align-items: center;
    padding: 10px 15px;
    text-decoration: none;
    color: var(--text-color);
    border-radius: var(--border-radius);
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.sidebar nav ul li a span {
    margin-right: 10px;
    font-size: 1.2em;
}

.sidebar nav ul li a:hover,
.sidebar nav ul li a.active {
    background-color: var(--primary-color);
    color: white;
}

/* Dark Mode Toggle (Sidebar & Settings) */
.dark-mode-toggle-container {
    margin-top: auto; /* Pushes to the bottom */
    padding-top: var(--spacing-unit);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

#dark-mode-toggle, #dark-mode-toggle-settings {
    background-color: var(--primary-color);
    color: white;
    padding: 8px 15px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1em;
    transition: background-color var(--transition-speed);
}

#dark-mode-toggle:hover, #dark-mode-toggle-settings:hover {
    background-color: var(--secondary-color);
}

/* Top Navbar */
.top-navbar {
    grid-area: 1 / 2 / 2 / 3; /* Spans row 1, column 2 */
    background-color: var(--card-background);
    box-shadow: 0 2px 10px var(--shadow-light);
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-unit);
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
}

.top-navbar .app-name {
    margin: 0;
    font-size: 1.5em;
    color: var(--primary-color);
}

.top-navbar .quick-summary span {
    margin-left: var(--spacing-unit);
    font-weight: bold;
}

/* Main Content Area */
.main-content {
    grid-area: 2 / 2 / 3 / 3; /* Spans row 2, column 2 */
    background-color: var(--background-color);
    padding: var(--spacing-unit);
    overflow: hidden; /* To handle internal section overflow if any, but aiming for no scroll */
    display: flex;
    flex-direction: column; /* Allows sections to stack */
}

.content-section {
    display: none; /* Hidden by default, shown by JS */
    background-color: var(--card-background);
    padding: calc(var(--spacing-unit) * 1.5);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 15px var(--shadow-light);
    height: 100%; /* Fill remaining space */
    box-sizing: border-box; /* Include padding in height calculation */
    overflow-y: auto; /* Allow section-specific scrolling if content exceeds height */
}

.content-section.active {
    display: block; /* Show active section */
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

input[type="date"],
input[type="number"],
input[type="text"],
select {
    width: calc(100% - 20px); /* Adjust for padding */
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1em;
    box-sizing: border-box; /* Include padding and border in width */
    background-color: var(--background-color);
    color: var(--text-color);
    transition: border-color var(--transition-speed), background-color var(--transition-speed);
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

button {
    background-color: var(--primary-color);
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1em;
    transition: background-color var(--transition-speed);
}

button:hover {
    background-color: var(--secondary-color);
}

.danger-button {
    background-color: var(--accent-color);
}

.danger-button:hover {
    background-color: #c0392b;
}

/* Expense List Table */
.expense-list-container {
    margin-top: var(--spacing-unit);
    overflow-x: auto; /* For very wide tables */
}

#expense-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-unit);
}

#expense-table th,
#expense-table td {
    border: 1px solid var(--border-color);
    padding: 10px;
    text-align: left;
}

#expense-table thead th {
    background-color: var(--primary-color);
    color: white;
}

#expense-table tbody tr:nth-child(even) {
    background-color: #f2f2f2;
}

body.dark-mode #expense-table tbody tr:nth-child(even) {
    background-color: var(--dark-mode-background-color);
}

#expense-table tbody tr:hover {
    background-color: #e9e9e9;
}
body.dark-mode #expense-table tbody tr:hover {
    background-color: #444; /* Darker hover for dark mode */
}


#expense-table .action-buttons button {
    padding: 5px 10px;
    font-size: 0.9em;
    margin-right: 5px;
}

.daily-totals, .monthly-summary-details {
    margin-top: var(--spacing-unit);
    padding: var(--spacing-unit);
    background-color: #f0f8ff; /* Light blue background */
    border-left: 5px solid var(--primary-color);
    border-radius: var(--border-radius);
}

body.dark-mode .daily-totals,
body.dark-mode .monthly-summary-details {
    background-color: var(--dark-mode-background-color);
    border-left-color: var(--primary-color);
}

.budget-warning {
    color: var(--accent-color);
    font-weight: bold;
    margin-top: 10px;
}

/* Category Breakdown (Chart.js or custom bars) */
.category-breakdown {
    margin-top: calc(var(--spacing-unit) * 2);
    text-align: center;
}

#category-chart {
    max-width: 500px; /* Limit chart size */
    margin: 0 auto;
    background-color: var(--card-background); /* Ensure chart background matches card */
    border-radius: var(--border-radius);
    padding: 10px; /* Some padding around the chart */
}
body.dark-mode #category-chart {
    background-color: var(--dark-mode-background-color);
}

#category-bars {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: var(--spacing-unit);
}

.category-bar {
    height: 25px;
    border-radius: 5px;
    text-align: right;
    color: white;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 10px;
    background-color: #ccc; /* Default background */
}

.category-bar span {
    margin-left: 5px;
}

/* Category Management */
#add-category-form {
    display: flex;
    gap: 10px;
    margin-bottom: var(--spacing-unit);
}

#add-category-form input {
    flex-grow: 1;
    width: auto; /* Override default width */
}

#category-list {
    list-style: none;
    padding: 0;
    margin-top: var(--spacing-unit);
}

#category-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px dashed var(--border-color);
}

#category-list li:last-child {
    border-bottom: none;
}

#category-list li button {
    padding: 5px 10px;
    font-size: 0.8em;
    background-color: var(--accent-color);
}

/* Utility classes for filtering/sorting */
.filter-sort-controls {
    display: flex;
    gap: var(--spacing-unit);
    align-items: center;
    margin-bottom: var(--spacing-unit);
    flex-wrap: wrap; /* Allow wrapping on slightly smaller desktop screens */
}

.filter-sort-controls label,
.filter-sort-controls select {
    white-space: nowrap; /* Prevent text wrapping */
}

.summary-actions {
    margin-top: var(--spacing-unit);
    display: flex;
    gap: var(--spacing-unit);
    justify-content: center; /* Center print/export buttons */
}
.summary-actions button {
    flex: 1; /* Make buttons take equal width if space allows */
    max-width: 200px;
}

/* Small Screen Message */
.small-screen-message {
    display: none; /* Hidden by default */
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9); /* Dark overlay */
    color: white;
    font-size: 1.5em;
    text-align: center;
    padding: 20px;
    box-sizing: border-box;
    z-index: 1000; /* Ensure it's on top */
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.small-screen-message p {
    max-width: 600px;
    padding: 20px;
    border: 2px solid white;
    border-radius: 10px;
}

/* Media Query for Small Screens */
@media (max-width: 1024px) { /* Adjust breakpoint as needed */
    .app-container {
        display: none; /* Hide the main app layout */
    }

    .small-screen-message {
        display: flex; /* Show the message */
    }
}


/* Print Styles (for monthly report) */
@media print {
    body {
        background-color: white;
        color: black;
        -webkit-print-color-adjust: exact; /* For better color printing */
    }

    .app-container {
        display: block; /* Remove grid for printing */
    }

    .sidebar, .top-navbar, #expense-form, .filter-sort-controls,
    #add-category-form, #category-list button, #settings-section button,
    #export-report-btn, #print-report-btn, .dark-mode-toggle-container,
    .small-screen-message, .summary-actions button {
        display: none; /* Hide UI elements not relevant for print */
    }

    .main-content {
        padding: 0;
        margin: 0;
        box-shadow: none;
        background-color: white;
    }

    .content-section {
        display: block !important; /* Force display for print */
        box-shadow: none;
        padding: 0;
        margin-bottom: 20px;
        page-break-inside: avoid; /* Avoid breaking sections across pages */
        border: none;
    }

    #monthly-summary-section {
        margin-top: 20px;
    }

    #expense-table {
        width: 100%;
        border-collapse: collapse;
        margin-top: 20px;
    }

    #expense-table th,
    #expense-table td {
        border: 1px solid black;
        padding: 8px;
        font-size: 0.9em;
    }

    #expense-table thead th {
        background-color: #eee;
        color: black;
    }

    .category-breakdown {
        margin-top: 20px;
    }

    #category-chart {
        display: none; /* Hide Chart.js chart for print, use text or simple bars */
    }

    #category-bars {
        display: flex; /* Ensure custom bars are visible */
    }

    h1, h2, h3, h4 {
        color: black;
        margin-top: 15px;
        margin-bottom: 10px;
    }
}