* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    padding: 40px;
    width: 100%;
    max-width: 400px;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
    font-size: 24px;
}

.input-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-weight: 500;
}

input[type="password"] {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

input[type="password"]:focus {
    outline: none;
    border-color: #667eea;
}

.strength-meter {
    margin-top: 15px;
}

.strength-bar {
    height: 8px;
    background: #e1e5e9;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 10px;
}

.strength-fill {
    height: 100%;
    width: 0%;
    transition: all 0.3s ease;
    border-radius: 4px;
}

.strength-text {
    font-size: 14px;
    font-weight: 500;
    text-align: center;
}

.requirements {
    margin-top: 20px;
    font-size: 14px;
}

.requirement {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
    color: #666;
}

.requirement.met {
    color: #28a745;
}

.requirement-icon {
    margin-right: 8px;
    font-weight: bold;
}

.score {
    font-size: 18px;
    font-weight: bold;
    text-align: center;
    margin-top: 15px;
}

/* Strength levels */
.very-weak { background: #dc3545; }
.weak { background: #fd7e14; }
.fair { background: #ffc107; }
.good { background: #20c997; }
.strong { background: #28a745; }

/* Responsive design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .container {
        padding: 20px;
        max-width: 100%;
    }
    
    h1 {
        font-size: 20px;
        margin-bottom: 20px;
    }
    
    input[type="password"] {
        font-size: 16px; /* Prevents zoom on iOS */
    }
}

@media (max-width: 480px) {
    .container {
        padding: 15px;
    }
    
    h1 {
        font-size: 18px;
    }
    
    .requirements {
        font-size: 13px;
    }
}