:root {
    --primary-color: #2e74b5;
    --secondary-color: #1e3d5c;
    --accent-color: #6cb4ff;
    --very-weak: #ff4d4d;
    --weak: #ffa64d;
    --medium: #ffdb4d;
    --strong: #80cc33;
    --very-strong: #00b33c;
    --background: #f6f8fa;
    --card-background: #ffffff;
    --text-color: #333333;
    --light-gray: #e6e6e6;
    --medium-gray: #b3b3b3;
    --dark-gray: #808080;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--background);
    color: var(--text-color);
    line-height: 1.6;
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding: 20px 0;
    border-bottom: 1px solid var(--light-gray);
}

h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
}

h2 {
    color: var(--secondary-color);
    margin-bottom: 15px;
}

h3 {
    margin-bottom: 10px;
}

main {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

@media (min-width: 768px) {
    main {
        grid-template-columns: 1fr 1fr;
    }
    
    #tips {
        grid-column: 1 / -1;
    }
}

section {
    margin-bottom: 30px;
}

.card {
    background-color: var(--card-background);
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* Generator Styles */
.controls {
    margin-bottom: 20px;
}

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

label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
}

.checkbox-group {
    display: flex;
    align-items: center;
    margin: 5px 0;
}

.checkbox-group label {
    margin-left: 8px;
    margin-bottom: 0;
    font-weight: normal;
}

input[type="range"] {
    width: 100%;
    max-width: 300px;
    margin-right: 10px;
}

input[type="number"] {
    width: 60px;
    padding: 8px;
    border: 1px solid var(--light-gray);
    border-radius: 4px;
}

select {
    padding: 8px;
    border: 1px solid var(--light-gray);
    border-radius: 4px;
    background-color: white;
    width: 100%;
    max-width: 300px;
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 10px 20px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

button:hover {
    background-color: var(--secondary-color);
}

#password-output {
    margin-top: 20px;
}

.password-container {
    display: flex;
    margin-bottom: 10px;
}

#password, #check-password {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--light-gray);
    border-radius: 4px;
    font-family: monospace;
    font-size: 1rem;
    margin-right: 10px;
}

#copy-btn {
    padding: 5px 10px;
}

#generated-passwords {
    margin-top: 15px;
}

.generated-password-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px;
    border: 1px solid var(--light-gray);
    border-radius: 4px;
    margin-bottom: 8px;
    font-family: monospace;
}

.password-copy-btn {
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    font-size: 1.2rem;
}

/* Strength Meter Styles */
#strength-meter-container {
    margin: 15px 0;
    height: 8px;
    background-color: var(--light-gray);
    border-radius: 4px;
}

#strength-meter {
    height: 100%;
    width: 0;
    border-radius: 4px;
    transition: width 0.3s, background-color 0.3s;
}

.very-weak { background-color: var(--very-weak); }
.weak { background-color: var(--weak); }
.medium { background-color: var(--medium); }
.strong { background-color: var(--strong); }
.very-strong { background-color: var(--very-strong); }

#strength-score {
    margin-bottom: 15px;
    font-weight: 600;
}

#feedback-list {
    padding-left: 20px;
}

#feedback-list li {
    margin-bottom: 5px;
}

/* Tips Section */
.tip-section {
    margin-bottom: 20px;
}

.tip-section ul {
    padding-left: 20px;
}

.tip-section li {
    margin-bottom: 8px;
}

/* Footer */
footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--light-gray);
    color: var(--dark-gray);
    font-size: 0.9rem;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Animation for copy feedback */
@keyframes copy-animation {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.copy-animation {
    animation: copy-animation 0.3s ease-in-out;
}

/* Animated toggle for show/hide password */
.eye-icon {
    position: relative;
    display: inline-block;
    width: 20px;
    height: 20px;
}

/* Responsive adjustments */
@media (max-width: 480px) {
    body {
        padding: 10px;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    .card {
        padding: 15px;
    }
    
    button {
        width: 100%;
        margin-bottom: 10px;
    }
    
    .password-container {
        flex-direction: column;
    }
    
    #password, #check-password {
        margin-right: 0;
        margin-bottom: 10px;
    }
}