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

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    text-align: center;
    margin-bottom: 2rem;
    color: white;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.header h1 i {
    margin-right: 0.5rem;
    color: #ffd700;
}

.header p {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 300;
}

.main-content {
    flex: 1;
}

.password-card {
    background: white;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
}

.password-display {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    align-items: center;
}

#passwordOutput {
    flex: 1;
    padding: 1rem 1.5rem;
    border: 2px solid #e1e5e9;
    border-radius: 12px;
    font-size: 1.1rem;
    font-family: 'Courier New', monospace;
    background: #f8f9fa;
    transition: all 0.3s ease;
}

#passwordOutput:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.copy-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.1rem;
    min-width: 50px;
}

.copy-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

.copy-btn:active {
    transform: translateY(0);
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.control-group label {
    font-weight: 600;
    color: #333;
    font-size: 1rem;
}

.length-control {
    display: flex;
    align-items: center;
    gap: 1rem;
}

#passwordLength {
    flex: 1;
    height: 8px;
    border-radius: 4px;
    background: #e1e5e9;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

#passwordLength::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

#passwordLength::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

#lengthValue {
    font-weight: 600;
    color: #667eea;
    min-width: 30px;
    text-align: center;
}

.options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.option input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: #667eea;
    cursor: pointer;
}

.option label {
    font-size: 0.9rem;
    cursor: pointer;
    user-select: none;
}

.generate-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1rem;
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

.generate-btn:active {
    transform: translateY(0);
}

.strength-meter {
    background: white;
    border-radius: 15px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.strength-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    font-weight: 600;
}

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

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

.strength-fill.weak {
    background: #ff4757;
    width: 25%;
}

.strength-fill.fair {
    background: #ffa502;
    width: 50%;
}

.strength-fill.good {
    background: #ffa502;
    width: 75%;
}

.strength-fill.strong {
    background: #2ed573;
    width: 100%;
}

.tips {
    background: white;
    border-radius: 15px;
    padding: 1.5rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.tips h3 {
    color: #667eea;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tips ul {
    list-style: none;
    padding-left: 0;
}

.tips li {
    padding: 0.5rem 0;
    border-bottom: 1px solid #f1f3f4;
    position: relative;
    padding-left: 1.5rem;
}

.tips li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #2ed573;
    font-weight: bold;
}

.tips li:last-child {
    border-bottom: none;
}

.footer {
    text-align: center;
    color: white;
    margin-top: 2rem;
    opacity: 0.8;
}

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: #2ed573;
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transform: translateX(400px);
    transition: transform 0.3s ease;
    z-index: 1000;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .password-card {
        padding: 1.5rem;
    }
    
    .options {
        grid-template-columns: 1fr;
    }
    
    .password-display {
        flex-direction: column;
    }
    
    .copy-btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.8rem;
    }
    
    .password-card {
        padding: 1rem;
    }
    
    .generate-btn {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
    }
}