:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --success-color: #27ae60;
    --danger-color: #e74c3c;
    --background-color: #f5f6fa;
}

body {
    font-family: 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    background-color: var(--background-color);
    color: var(--primary-color);
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.1);
}

h1 {
    color: var(--secondary-color);
    text-align: center;
    margin-bottom: 30px;
}

.config-panel {
    border: 1px solid #eee;
    padding: 20px;
    margin-bottom: 20px;
    border-radius: 8px;
}

.input-group {
    margin-bottom: 15px;
}

.input-group label {
    display: block;
    margin-bottom: 5px;
}

.input-group input[type="number"] {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.checkbox-group {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin: 15px 0;
}

.advanced-options {
    border-top: 1px dashed #eee;
    padding-top: 15px;
    margin-top: 15px;
}

button#generateBtn {
    width: 100%;
    padding: 12px;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.3s;
}

button#generateBtn:hover {
    background-color: #2980b9;
}

.password-display {
    display: flex;
    gap: 10px;
    margin: 20px 0;
}

.password-display input {
    flex: 1;
    padding: 12px;
    border: 2px solid var(--secondary-color);
    border-radius: 5px;
    font-size: 18px;
    text-align: center;
}

.copy-btn {
    padding: 12px 20px;
    background-color: var(--success-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.strength-meter {
    margin: 25px 0;
}

.strength-bar {
    height: 10px;
    background: #eee;
    border-radius: 5px;
    overflow: hidden;
    position: relative;
}

.strength-bar::after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 0;
    background: var(--danger-color);
    transition: width 0.3s ease;
}

.strength-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 5px;
    color: #666;
}

.safety-tips {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    margin-top: 20px;
}

@media (max-width: 768px) {
    .checkbox-group {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: 15px;
    }
}