:root {
    --bg-color: #f0f4f8;
    --container-bg: #ffffff;
    --text-color: #333;
    --label-color: #444;
    --card-bg: #f7f9fb;
    --checkbox-bg: #f9f9f9;
    --button-bg: #0078D7;
    --button-hover-bg: #005ea6;
    --selected-bg: #4CAF50;
    --selected-text: #ffffff;
    --border-color: #ccc;
    --pulse-shadow: rgba(0, 120, 215, 0.4);
}

.dark-mode {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --text-color: #f0f0f0;
    --label-color: #cccccc;
    --card-bg: #2a2a2a;
    --checkbox-bg: #333333;
    --button-bg: #005ea6;
    --button-hover-bg: #003f7d;
    --selected-bg: #66bb6a;
    --selected-text: #ffffff;
    --border-color: #444444;
    --pulse-shadow: rgba(0, 120, 215, 0.6);
}

body {
    font-family: 'Segoe UI', sans-serif;
    background-color: var(--bg-color);
    margin: 0;
    padding: 40px;
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 800px;
    margin: auto;
    background: var(--container-bg);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

h2 {
    text-align: center;
    margin-bottom: 30px;
}

.form-section {
    margin-bottom: 25px;
}

.form-label {
    font-weight: 600;
    margin-bottom: 10px;
    display: block;
    color: var(--label-color);
}

.form-row {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

    .form-row .form-section {
        flex: 1;
        min-width: 200px;
    }


.checkbox-group, .period-group {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

    .checkbox-group td, .period-group td {
        padding: 5px;
    }

.asp-checkbox label {
    display: inline-block;
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--checkbox-bg);
    cursor: pointer;
    user-select: none;
}

.asp-checkbox input:checked + label {
    background-color: var(--selected-bg);
    color: var(--selected-text);
    border-color: var(--selected-bg);
}

.asp-dropdown, select, .asp-listbox select {
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--container-bg);
    color: var(--text-color);
    min-width: 150px;
}

.asp-listbox select {
    height: 120px;
}

.submit-button {
    padding: 10px 20px;
    background-color: var(--button-bg);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    cursor: pointer;
}

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