:root {
    --primary-color: #4a90e2;
    --secondary-color: #50e3c2;
    --background-color: #f4f7f9;
    --surface-color: #ffffff;
    --text-color: #333333;
    --text-secondary-color: #777;
    --border-color: #e0e0e0;
    --danger-color: #d0021b;
    --success-color: #7ed321;
}

body.dark-mode {
    --background-color: #121212;
    --surface-color: #1e1e1e;
    --text-color: #e0e0e0;
    --text-secondary-color: #a0a0a0;
    --border-color: #333333;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
    line-height: 1.6;
}
.container { max-width: 1200px; margin: 0 auto; padding: 20px; }
header { display: flex; justify-content: space-between; align-items: center; padding-bottom: 20px; border-bottom: 1px solid var(--border-color); margin-bottom: 20px; }
header h1 { color: var(--primary-color); }

nav ul { list-style: none; display: flex; gap: 15px; }
nav a { text-decoration: none; color: var(--text-secondary-color); font-weight: bold; padding: 8px 12px; border-radius: 6px; transition: background-color 0.2s, color 0.2s; }
nav a:hover { color: var(--text-color); }
nav a.active { background-color: var(--primary-color); color: white; }

main { display: grid; grid-template-columns: 1fr; gap: 20px; }
@media (min-width: 768px) { main.grid-2 { grid-template-columns: 350px 1fr; } }

.card { background-color: var(--surface-color); border-radius: 8px; padding: 20px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); border: 1px solid var(--border-color); }
.card h2 { margin-bottom: 15px; border-bottom: 1px solid var(--border-color); padding-bottom: 10px; font-size: 1.2rem; color: var(--text-color);}
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; font-weight: bold; color: var(--text-secondary-color); }
.form-group input, .form-group select { 
    width: 100%; 
    padding: 10px; 
    border: 1px solid var(--border-color); 
    border-radius: 4px; 
    background-color: var(--background-color); 
    color: var(--text-color); 
    font-size: 1rem;
}
/* --- FIX: Style for placeholder text in dark mode --- */
body.dark-mode .form-group input::placeholder {
    color: #6c757d;
}

.btn { padding: 10px 15px; border: none; border-radius: 4px; cursor: pointer; font-weight: bold; display: inline-flex; align-items: center; gap: 8px; }
.btn-primary { background-color: var(--primary-color); color: white; }
.btn-danger { background-color: var(--danger-color); color: white; padding: 5px 10px; font-size: 0.8rem; }
ul { list-style-type: none; }

/* --- FIX: Explicitly set text color for list items --- */
#transaction-list li, #category-list li { 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    padding: 15px 10px; 
    border-bottom: 1px solid var(--border-color); 
    color: var(--text-color); /* This ensures text is visible */
}

#transaction-list li:last-child, #category-list li:last-child { border-bottom: none; }
.transaction-details { display: flex; flex-direction: column; }
.transaction-description { font-weight: bold; }
.transaction-category { font-size: 0.9rem; color: var(--text-secondary-color); }
.transaction-amount { font-weight: bold; font-size: 1.1rem; }
.transaction-amount.income { color: var(--success-color); }
.transaction-amount.expense { color: var(--danger-color); }
#empty-state { text-align: center; padding: 40px; color: var(--text-secondary-color); }
#category-list { margin-top: 15px; }

/* Styling for Dashboard Summary */
.dashboard-summary { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; margin-bottom: 20px; }
.summary-card { background-color: var(--surface-color); padding: 20px; border-radius: 8px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); border-left: 5px solid; border-top: 1px solid var(--border-color); border-right: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); }
.summary-card h4 { margin-bottom: 10px; font-size: 1rem; color: var(--text-secondary-color); opacity: 0.8; }
.summary-card p { font-size: 2rem; font-weight: bold; }
.summary-card.income { border-left-color: var(--success-color); }
.summary-card.income p { color: var(--success-color); }
.summary-card.expense { border-left-color: var(--danger-color); }
.summary-card.expense p { color: var(--danger-color); }
.summary-card.balance { border-left-color: var(--primary-color); }
.summary-card.balance p { color: var(--primary-color); }

/* Styles for Transaction Action Buttons */
.transaction-actions {
    display: flex;
    gap: 10px;
}

.btn-edit {
    background-color: #f5a623; /* Orange */
    color: white;
    padding: 5px 10px;
    font-size: 0.8rem;
}

.btn-save-edit {
    background-color: var(--success-color); /* Green */
}