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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, 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: 20px;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    text-align: center;
    max-width: 500px;
    width: 100%;
}

h1 {
    color: #333;
    margin-bottom: 30px;
    font-size: 2.5em;
    font-weight: 600;
}

.password-display {
    background: #f8f9fa;
    border: 2px solid #e9ecef;
    border-radius: 12px;
    padding: 20px;
    margin: 20px 0;
    font-family: 'Courier New', monospace;
    font-size: 18px;
    word-break: break-all;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #495057;
    transition: all 0.3s ease;
}

.password-display.generated {
    background: #e8f5e8;
    border-color: #28a745;
    color: #155724;
}

.controls {
    margin: 30px 0;
}

.options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin: 20px 0;
    text-align: left;
}

.option {
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.option label {
    color: #555;
    font-weight: 500;
}

.length-control {
    margin: 20px 0;
    text-align: left;
}

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

.length-control input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: #ddd;
    outline: none;
    accent-color: #667eea;
}

.length-display {
    text-align: center;
    margin-top: 8px;
    font-weight: 600;
    color: #667eea;
}

.buttons {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

button {
    flex: 1;
    padding: 15px 25px;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

.copy-btn {
    background: #28a745;
    color: white;
}

.copy-btn:hover {
    background: #218838;
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(40, 167, 69, 0.3);
}

.copy-btn:disabled {
    background: #6c757d;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: #28a745;
    color: white;
    padding: 15px 25px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transform: translateX(400px);
    transition: transform 0.3s ease;
}

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

@media (max-width: 480px) {
    .container {
        padding: 30px 20px;
    }
    
    .options {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .buttons {
        flex-direction: column;
    }
}