/* Modern Theme */
:root {
    --primary-bg: #f0f2f5;
    --secondary-bg: #ffffff;
    --accent-color: #ff9800;
    --accent-hover: #f57c00;
    --primary-text: #1c1e21;
    --secondary-text: #606770;
    --danger-color: #f44336;
    --danger-hover: #d32f2f;
    --border-color: #dddfe2;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Open Sans', sans-serif;
    background-color: var(--primary-bg);
    color: var(--primary-text);
    margin: 0;
    padding: 20px;
    transition: background-color 0.3s, color 0.3s;
}

body.dark-mode {
    --primary-bg: #1e1e2f;
    --secondary-bg: #27293d;
    --primary-text: #ffffff;
    --secondary-text: #a9a9b3;
    --border-color: #404258;
    --shadow-color: rgba(0, 0, 0, 0.2);
}


.app-container {
    max-width: 1400px;
    margin: 0 auto;
    background-color: var(--secondary-bg);
    border-radius: 12px;
    box-shadow: 0 8px 24px var(--shadow-color);
    overflow: hidden;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    background-color: var(--secondary-bg);
    border-bottom: 1px solid var(--border-color);
}

header h1 {
    margin: 0;
    font-size: 1.8em;
    font-weight: 600;
}

.header-controls button {
    background-color: var(--primary-bg);
    border: 1px solid var(--border-color);
    color: var(--primary-text);
    padding: 10px 16px;
    border-radius: 8px;
    cursor: pointer;
    margin-left: 12px;
    transition: background-color 0.2s;
}

.header-controls button:hover {
    background-color: var(--border-color);
}

#theme-toggle {
    font-size: 1.4em;
    background: none;
    border: none;
    padding: 0 10px;
}

.tabs {
    display: flex;
    justify-content: center; /* Center the tabs */
    background-color: var(--secondary-bg);
    padding: 10px 30px;
    border-bottom: 1px solid var(--border-color);
}

.tab-link {
    padding: 12px 20px;
    cursor: pointer;
    background-color: var(--primary-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin: 0 5px;
    font-size: 1em;
    font-weight: 500;
    color: var(--secondary-text);
    transition: all 0.2s;
}

.tab-link.active {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.tab-content {
    display: none;
    padding: 30px;
    animation: fadeIn 0.5s;
}

.tab-content.active {
    display: block;
}

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

/* General UI Elements */
button {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1em;
    font-weight: 500;
    transition: background-color 0.2s;
}

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

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

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

input, select, textarea {
    width: 100%;
    padding: 12px;
    margin: 8px 0;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-sizing: border-box;
    background-color: var(--primary-bg);
    color: var(--primary-text);
    font-family: 'Poppins', sans-serif;
}

/* Expense Table */
.expense-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

.expense-table th, .expense-table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

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

/* Modals */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s;
}

.modal-content {
    background-color: var(--secondary-bg);
    margin: 10% auto;
    padding: 30px;
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    position: relative;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}

.close-btn {
    color: var(--secondary-text);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close-btn:hover, .close-btn:focus {
    color: var(--primary-text);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    margin-top: 20px;
}

.modal-actions button {
    margin-left: 10px;
}

/* Category List */
.category-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background-color: var(--primary-bg);
    border-radius: 8px;
    margin-bottom: 10px;
}

.subcategory-list {
    padding-left: 20px;
    margin-top: 10px;
}

.subcategory-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 15px;
    background-color: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-top: 5px;
}

/* Dashboard */
#dashboard-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.summary-card {
    background-color: var(--secondary-bg);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 12px var(--shadow-color);
}

.summary-card h3 {
    margin: 0 0 10px 0;
    color: var(--secondary-text);
    font-size: 1em;
}

.summary-card p {
    margin: 0;
    font-size: 2em;
    font-weight: 600;
    color: var(--accent-color);
}

#dashboard-chart-container {
    position: relative;
    height: 400px;
    margin-top: 30px;
}

footer {
    text-align: center;
    padding: 100px 20px 20px 20px;
    background-color: var(--secondary-bg);
    border-top: 1px solid var(--border-color);
    color: var(--secondary-text);
}