:root {
    --primary-color: #2b6cb0;
    --bg-color: #f7fafc;
    --card-bg: #ffffff;
    --text-color: #2d3748;
    --alert-color: #e53e3e;
}
body {
    font-family: Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
}
header {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    padding: 20px 10px;
}
.container {
    max-width: 600px;
    margin: 30px auto;
    padding: 0 15px;
}
.card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    margin-bottom: 20px;
}
h2 {
    margin-top: 0;
    color: var(--primary-color);
    font-size: 1.2rem;
    border-bottom: 2px solid #e2e8f0;
    padding-bottom: 5px;
}
.form-group {
    margin-bottom: 15px;
}
label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}
input, select {
    width: 100%;
    padding: 10px;
    border: 1px solid #cbd5e0;
    border-radius: 4px;
    box-sizing: border-box;
}
.btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px;
    width: 100%;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
}
.btn:hover {
    background-color: #2c5282;
}
.alert {
    color: var(--alert-color);
    font-weight: bold;
    background-color: #fff5f5;
    padding: 10px;
    border-left: 4px solid var(--alert-color);
}
.hidden {
    display: none;
}
ul {
    list-style-type: none;
    padding: 0;
}
li {
    padding: 10px;
    border-bottom: 1px solid #edf2f7;
    font-size: 0.95rem;
}