body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 20px;
}

h3 {
    margin: 0;
    color: #333;
}

.card {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 20px;
    padding: 20px;
}

.section-title {
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
    margin-bottom: 15px;
}

/* 输入部分 */
.input-section {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.input-group {
    flex: 1;
    min-width: 200px;
}

.button-group {
    display: flex;
    justify-content: center;
    width: 100%;
    margin-top: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #555;
}

input[type="text"], input[type="number"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    box-sizing: border-box;
}

.btn {
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

.btn:hover {
    background-color: #45a049;
}

/* 结果部分 */
.result-info {
    margin-bottom: 15px;
    padding: 10px;
    background-color: #f8f9fa;
    border-radius: 4px;
    border-left: 4px solid #4CAF50;
}

.subnet-table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

th, td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

th {
    background-color: #f2f2f2;
    font-weight: bold;
    color: #333;
}

tr:hover {
    background-color: #f5f5f5;
}

.monospace {
    font-family: monospace;
}


/* 子网掩码输入容器 */
.mask-input-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

.or-text {
    font-size: 14px;
    color: #666;
}

.cidr-input {
    width: 60px !important;
}