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

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

.container {
    width: 100%;
    max-width: 500px;
}

.password-app {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Header */
.app-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

.app-header h1 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.app-header p {
    opacity: 0.9;
    font-weight: 300;
}

/* Password Display */
.password-display {
    padding: 30px;
    background: #f8f9fa;
    border-bottom: 1px solid #e9ecef;
}

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

#passwordOutput {
    flex: 1;
    padding: 15px 20px;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    font-size: 1.1rem;
    font-family: 'Courier New', monospace;
    background: white;
    text-align: center;
    font-weight: 600;
    letter-spacing: 1px;
    outline: none;
}

.copy-btn {
    background: linear-gradient(135deg, #4299e1 0%, #3182ce 100%);
    color: white;
    border: none;
    border-radius: 12px;
    width: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.copy-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(66, 153, 225, 0.4);
}

.copy-btn.copied {
    background: linear-gradient(135deg, #48bb78 0%, #38a169 100%);
}

.password-strength {
    display: flex;
    align-items: center;
    gap: 15px;
}

.strength-meter {
    flex: 1;
    height: 8px;
    background: #e2e8f0;
    border-radius: 4px;
    overflow: hidden;
}

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

.strength-bar.very-weak {
    background: #e53e3e;
    width: 20%;
}

.strength-bar.weak {
    background: #ed8936;
    width: 40%;
}

.strength-bar.medium {
    background: #ecc94b;
    width: 60%;
}

.strength-bar.strong {
    background: #48bb78;
    width: 80%;
}

.strength-bar.very-strong {
    background: #38a169;
    width: 100%;
}

.strength-text {
    font-weight: 600;
    font-size: 0.9rem;
    min-width: 80px;
    text-align: right;
}

/* Settings Section */
.settings-section {
    padding: 30px;
    border-bottom: 1px solid #e9ecef;
}

.settings-section h3 {
    margin-bottom: 25px;
    color: #2d3748;
    font-weight: 600;
}

.setting-group {
    margin-bottom: 30px;
}

.setting-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.setting-header label {
    font-weight: 500;
    color: #4a5568;
}

.length-value {
    font-weight: 600;
    color: #667eea;
    font-size: 1.1rem;
}

.length-slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: #e2e8f0;
    outline: none;
    -webkit-appearance: none;
}

.length-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #667eea;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(102, 126, 234, 0.4);
}

.length-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 5px;
    color: #718096;
    font-size: 0.8rem;
}

/* Character Options */
.character-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.option-label {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    padding: 8px 0;
}

.option-label input {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid #cbd5e0;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.option-label input:checked + .checkmark {
    background: #667eea;
    border-color: #667eea;
}

.option-label input:checked + .checkmark::after {
    content: '✓';
    color: white;
    font-size: 12px;
    font-weight: bold;
}

.option-text {
    color: #4a5568;
    font-weight: 500;
}

.additional-options {
    margin-top: 10px;
}

/* Action Buttons */
.action-buttons {
    padding: 0 30px 30px;
    display: flex;
    gap: 15px;
}

.generate-btn, .regenerate-btn {
    flex: 1;
    padding: 15px 20px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.generate-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.regenerate-btn {
    background: #edf2f7;
    color: #4a5568;
    border: 2px solid #e2e8f0;
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

.regenerate-btn:hover {
    background: #e2e8f0;
    transform: translateY(-2px);
}

/* History Section */
.history-section {
    padding: 0 30px 30px;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.history-header h3 {
    color: #2d3748;
    font-weight: 600;
}

.clear-history-btn {
    background: none;
    border: none;
    color: #718096;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 6px;
}

.clear-history-btn:hover {
    background: #fed7d7;
    color: #e53e3e;
}

.password-history {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-height: 200px;
    overflow-y: auto;
}

.history-item {
    background: #f7fafc;
    padding: 12px 16px;
    border-radius: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
    gap: 10px;
}

.history-password {
    font-family: 'Courier New', monospace;
    font-weight: 600;
    letter-spacing: 1px;
    color: #2d3748;
}

.history-actions {
    display: flex;
    gap: 8px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.history-item:hover .history-actions {
    opacity: 1;
}

.history-copy-btn, .history-delete-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
    border-radius: 4px;
    transition: all 0.3s ease;
    color: #a0aec0;
}

.history-copy-btn:hover {
    background: rgba(66, 153, 225, 0.1);
    color: #4299e1;
}

.history-delete-btn:hover {
    background: rgba(229, 62, 62, 0.1);
    color: #e53e3e;
}

/* Copy Notification */
.copy-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: #48bb78;
    color: white;
    padding: 12px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(72, 187, 120, 0.3);
    display: flex;
    align-items: center;
    gap: 8px;
    transform: translateX(150%);
    transition: transform 0.3s ease;
    z-index: 1000;
}

.copy-notification.show {
    transform: translateX(0);
}

/* Scrollbar */
.password-history::-webkit-scrollbar {
    width: 6px;
}

.password-history::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 3px;
}

.password-history::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 3px;
}

.password-history::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}

/* Responsive */
@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    .app-header {
        padding: 20px;
    }
    
    .app-header h1 {
        font-size: 1.5rem;
    }
    
    .password-display, .settings-section, .action-buttons, .history-section {
        padding: 20px;
    }
    
    .character-options {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .copy-notification {
        top: 10px;
        right: 10px;
        left: 10px;
        transform: translateY(-100px);
    }
    
    .copy-notification.show {
        transform: translateY(0);
    }
}